CN204400858U - The coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean - Google Patents
The coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean Download PDFInfo
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- CN204400858U CN204400858U CN201420755659.3U CN201420755659U CN204400858U CN 204400858 U CN204400858 U CN 204400858U CN 201420755659 U CN201420755659 U CN 201420755659U CN 204400858 U CN204400858 U CN 204400858U
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- manganese slag
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Abstract
The utility model discloses a kind of coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean, comprise gas generating system, production of compound fertilizer system and mixed fertilizer drying cooled exhaust gas treatment system, described gas generating system comprises two stage type gas generating furnace, tar well, tornado dust collector, emergency switching-off device and stokehold water-sealed tank, described production of compound fertilizer system comprises roasting kiln induced draft fan, roasting kiln, weighing and dispensing system, mixer, raw material chopper, tablets press, mixed fertilizer drying machine, compound fertilizer cooler provided, freezing air induced draft fan, sieve apparatus, film applicator and metering packaging machine.The utility model utilizes manganese slag for raw material, and by adding various nitrogen, phosphorus, potassium base fertilizer obtain compound fertilizer product, turns waste into wealth.In addition, the utility model adopts two stage type gas generating furnace as heat resource equipment, and improve caloric power of gas and gasification efficiency, the utility model has also carried out abundant process to mixed fertilizer drying cooled exhaust gas, can ensure that environment-protecting clean is produced.
Description
Technical field
The utility model relates to waste emissions technical field of comprehensive utilization, is specifically related to a kind of coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean.
Background technology
Potassium permanganate production can produce a large amount of waste emissions-manganese slag, and manganese slag possesses the basic substance obtaining considerable economic benefit, containing the direct available macronutrient of plant in analysis of experiments manganese slag, and potassium (K
2o), phosphorus (P
2o
5) contents on dry basis is up to 10 ~ 11%.Estimate by existing market, manganese slag agriculture fertilizer recycling, produce manganese slag 1.5 ten thousand tons and 3.0 ten thousand tons wet slags per year, average annual immediate yield 262.5 ten thousand yuan ~ 288.75 ten thousand yuan and 5,250,000 yuan ~ 577.5 ten thousand yuan, reduce that direct landfill is disposable builds slag field expense more than 400 ten thousand yuan simultaneously, per Spring Festival holidays prop up the expense of mucking haulage 150 ~ 3,000,000 yuan, are directly conducive to the Sustainable development of enterprise.
Therefore, as raw material production Chemical Mixed Fertilizer after manganese slag suitable modification removal objectionable impurities, not only solve the emission problem of existing waste, and production cost like product more of the same trade can reduce by more than 100 yuan/ton, be make full use of resource, really accomplish to turn waste into wealth.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean, utilizes manganese slag for raw material, and by adding various nitrogen, phosphorus, potassium base fertilizer obtain compound fertilizer product, make full use of resource, turn waste into wealth.
For achieving the above object, the utility model provides following technical scheme:
The utility model discloses a kind of coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean, comprise gas generating system, production of compound fertilizer system and mixed fertilizer drying cooled exhaust gas treatment system;
Described gas generating system comprises two stage type gas generating furnace, tar well, tornado dust collector, emergency switching-off device and stokehold water-sealed tank, described two stage type gas generating furnace comprises top belljar valve, top retort section body of heater, bottom gasification section body of heater and bottom ash-pan, described retort section body of heater is connected with tar well, described gasification section body of heater is connected with tornado dust collector, introduces stokehold water-sealed tank after the outlet conduit of described tar well and tornado dust collector converges by emergency switching-off device;
Described production of compound fertilizer system comprises roasting kiln induced draft fan, roasting kiln, weighing and dispensing system, mixer, raw material chopper, tablets press, mixed fertilizer drying machine, compound fertilizer cooler provided, freezing air induced draft fan, sieve apparatus, film applicator and metering packaging machine, described weighing and dispensing system, mixer, raw material chopper, tablets press, mixed fertilizer drying machine, compound fertilizer cooler provided, sieve apparatus, film applicator is connected successively with metering packaging machine, the gas exit pipeline of described stokehold water-sealed tank is connected with roasting kiln, the wind pipe of described roasting kiln induced draft fan is connected with roasting kiln, the hot air outlet pipeline of described roasting kiln is connected with mixed fertilizer drying machine, the wind pipe of described freezing air induced draft fan is connected with compound fertilizer cooler provided,
Described mixed fertilizer drying cooled exhaust gas treatment system comprises settling pocket, washing tower, settling tank and clean water basin, oven dry offgas outlet pipeline and the cooled exhaust gas outlet conduit of compound fertilizer cooler provided of described mixed fertilizer drying machine converge and are connected with settling pocket afterwards, the offgas outlet pipeline of described settling pocket is connected with washing tower bottom, described washing tower top is connected with exhaust gas emission chimney, described clean water basin are connected with tap water pipe network, described clean water basin are connected with the sprinkling system in washing tower by recycle pump, described wash tower bottoms is connected with settling tank, described settling tank is connected with clean water basin.
Further, described gas generating system also comprises drum and producer gas generator induced draft fan, described gasification section body of heater is provided with water holding jacket, described drum is connected with softening water pipe network, the water holding jacket entrance and exit of gasification section body of heater is connected with drum respectively, the steam outlet of drum is divided into two-way, and a pass enters two stage type gas generating furnace and is used as sealing gland steam, and the wind pipe of another road and producer gas generator induced draft fan converges bottom rear introducing two stage type gas generating furnace as vaporized chemical.
Further, described gas generating system also comprises residual gas flashback tank and water seal feedwater piping, and service water pipe network is connected with residual gas flashback tank, ash-pan, emergency switching-off device and stokehold water-sealed tank respectively by water seal feedwater piping.
Further, described mixer is all connected by rotary conveyor with between raw material chopper, between raw material chopper with tablets press and between tablets press with mixed fertilizer drying machine.
Further, described mixed fertilizer drying machine is with between compound fertilizer cooler provided, be all connected by lift between compound fertilizer cooler provided with sieve apparatus, between sieve apparatus with film applicator and between film applicator with metering packaging machine.
Further, described tablets press is rotary drum granulator.
Further, described mixed fertilizer drying machine is rotary dryer.
Further, described compound fertilizer cooler provided is rotary cooler.
Further; described sieve apparatus is made up of upper strata scalping, middle level dusting cover and lower floor's powder plate; the Chemical Mixed Fertilizer outlet of described compound fertilizer cooler provided is connected with the upper strata scalping of sieve apparatus; the middle level dusting cover of described sieve apparatus is connected with film applicator; the upper strata scalping of described sieve apparatus is connected with raw material chopper, and lower floor's powder plate of described sieve apparatus is connected with tablets press.
Further, described settling pocket is gravity settling chamber, and described settling tank is two-stage settling tank, and upper level settling tank is connected with next stage settling tank by overflow port, and described washing tower is packing tower.
The beneficial effects of the utility model are:
1, the utility model utilizes manganese slag for raw material, and by adding various nitrogen, phosphorus, potassium base fertilizer obtain compound fertilizer product, not only solves the emission problem of existing waste, and make full use of resource, turn waste into wealth.
2, the utility model adopts two stage type gas generating furnace as heat resource equipment, and two stage type gas generating furnace comprises top retort section body of heater and bottom gasification section body of heater; The tar that top retort section body of heater is formed is low-temperature pyrolysis product, and its mobility is better, is collected centrally dispose by tar well; The gasification gas that bottom gasification section body of heater generates is not containing tar; The mixed gas that gasification gas and dry distillation gas are formed is semi-water gas, is also heating gas, comparatively pure, not containing tar, does not need cooling and purifying.Therefore, the utility model improves caloric power of gas and gasification efficiency, and decreases environmental pollution.
3, mixed fertilizer drying tail gas and Chemical Mixed Fertilizer cooled exhaust gas are shared a set of exhaust treatment system by the utility model, and mixed fertilizer drying cooled exhaust gas is mainly containing Chemical Mixed Fertilizer dust, SO
2with a small amount of ammonia, tail gas is first by settling pocket removing larger particles dust, enter washing tower water again and carry out spray washing, except can further except dedusting, desulfurization can be played and except the effect of ammonia simultaneously, the tail gas after process through exhaust gas emission smoke stack emission, therefore, the utility model has carried out abundant process to mixed fertilizer drying cooled exhaust gas, can ensure that environment-protecting clean is produced.
Accompanying drawing explanation
In order to make the purpose of this utility model, technical scheme and beneficial effect clearly, the utility model provides following accompanying drawing to be described:
Fig. 1 is the structural representation of gas generating system;
Fig. 2 is the structural representation of production of compound fertilizer system;
Fig. 3 is the structural representation of mixed fertilizer drying cooled exhaust gas treatment system.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail.
The coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean of the present utility model, comprises gas generating system, production of compound fertilizer system and mixed fertilizer drying cooled exhaust gas treatment system.
Fig. 1 is the structural representation of gas generating system, as shown in the figure, gas generating system comprises two stage type gas generating furnace 11, tar well 12, tornado dust collector 13, emergency switching-off device 14 and stokehold water-sealed tank 15, described two stage type gas generating furnace 11 comprises top belljar valve 111, top retort section body of heater 112, bottom gasification section body of heater 113 and bottom ash-pan 114, described retort section body of heater 112 is connected with tar well 12, described gasification section body of heater 113 is connected with tornado dust collector 13, stokehold water-sealed tank 15 is introduced by emergency switching-off device 14 after the outlet conduit of described tar well 12 and tornado dust collector 13 converges.
Described gas generating system also comprises drum 16 and producer gas generator induced draft fan 17, described gasification section body of heater 113 is provided with water holding jacket, described drum 16 is connected with softening water pipe network 18, the water holding jacket entrance and exit of gasification section body of heater 113 is connected with drum 16 respectively, the steam outlet of drum 16 is divided into two-way, one pass enters two stage type gas generating furnace 11 and is used as sealing gland steam, and the wind pipe of another road and producer gas generator induced draft fan 17 converges bottom rear introducing two stage type gas generating furnace 11 as vaporized chemical.
Described gas generating system also comprises residual gas flashback tank 19 and water seal feedwater piping, and service water pipe network 10 is connected with residual gas flashback tank 19, ash-pan 114, emergency switching-off device 14 and stokehold water-sealed tank 15 respectively by water seal feedwater piping.
First coal enters two stage type gas generating furnace 11 from furnace roof coal bunker through two groups of belljar valves 111, coal at retort section body of heater 112 through sufficient drying and long low-temperature pyrolysis, form semicoke gradually, enter gasification section body of heater 113, the vaporized chemical that red-hot semicoke blasts at gasification section body of heater 113 and furnace bottom fully reacts, through furnace reduction layer, zone of oxidation and form coal ash, driven by grate and automatically discharge from bottom ash-pan 114.
Coal is in the process of low-temperature pyrolysis, and with fugitive constituent precipitation for the coal gas of main generation is called dry distillation gas, the top coal gas of composition two stage type gas generating furnace 11, accounts for 40% of total coal gas amount, the higher (6700kJ/Nm of its calorific value
3) temperature lower (about 120 DEG C), and containing a large amount of tar.This tar formed at retort section body of heater 112 is low-temperature pyrolysis product, and its mobility is better, is collected centrally dispose by tar well 12.At gasification section body of heater 113, the coal gas that red-hot semicoke and vaporized chemical (air, water vapor) generate through series of chemical such as reduction, oxidations, be called gasification gas, the bottom coal gas of composition two stage type gas generating furnace 11, account for 60% of total coal gas amount, the relatively low (6400kJ/Nm of its calorific value
3), temperature higher (about 450 DEG C).Because coal is at retort section body of heater 112 low-temperature pyrolysis ample time, the coal entering gasification section body of heater 113 becomes semicoke, and the gasification gas therefore generated is not containing tar.Gasification gas forms mixed gas and goes to burn for providing thermal source through emergency switching-off device 14 and stokehold water-sealed tank 15 after tornado dust collector 13 dedusting with dry distillation gas.
Gasification section body of heater 113 is provided with water jacket, the softening water in drum 16 is introduced water jacket, by this self-produced water vapor, a water vapor part is used as sealing gland steam, and the air mixed that another part and producer gas generator induced draft fan 17 are introduced is used as vaporized chemical.
Gas generating system is owing to have employed the hot detar technique of two section type, and the coal gas obtained is semi-water gas, is also heating gas, comparatively pure, not containing tar, does not need cooling and purifying.Gas composition is CO, H
2, CH
4, combustiblecomponents and the CO such as CnHm
2, N
2etc. non-combustible composition, and in gasification the ignition dope oxygen of non-complete reaction and the water vapor that do not decompose completely.Producer gas generator adopts stone coal, does not need fragmentation; Coal gas is produce continuously and use, and does not need gas holder to store.
Fig. 2 is the structural representation of production of compound fertilizer system, as shown in the figure, production of compound fertilizer system comprises roasting kiln induced draft fan 201, roasting kiln 20, weighing and dispensing system 21, mixer 22, raw material chopper 23, tablets press 24, mixed fertilizer drying machine 25, compound fertilizer cooler provided 26, freezing air induced draft fan 202, sieve apparatus 27, film applicator 28 and metering packaging machine 29, described weighing and dispensing system 21, mixer 22, raw material chopper 23, tablets press 24, mixed fertilizer drying machine 25, compound fertilizer cooler provided 26, sieve apparatus 27, film applicator 28 is connected successively with metering packaging machine 29, the gas exit pipeline of described stokehold water-sealed tank 15 is connected with roasting kiln 20, the wind pipe of described roasting kiln induced draft fan 201 is connected with roasting kiln 20, the hot air outlet pipeline of described roasting kiln 20 is connected with mixed fertilizer drying machine 25, the wind pipe of described freezing air induced draft fan 202 is connected with compound fertilizer cooler provided 26.
Described mixer 22 is with between raw material chopper 23, be all connected by rotary conveyor between raw material chopper 23 with tablets press 24 and between tablets press 24 with mixed fertilizer drying machine 25.Described mixed fertilizer drying machine 25 is with between compound fertilizer cooler provided 26, be all connected by lift between compound fertilizer cooler provided 26 with sieve apparatus 27, between sieve apparatus 27 with film applicator 28 and between film applicator 28 with metering packaging machine 29.
Described tablets press 24 is rotary drum granulator, and described mixed fertilizer drying machine 25 is rotary dryer, and described compound fertilizer cooler provided 26 is rotary cooler.
Described sieve apparatus 27 is made up of upper strata scalping, middle level dusting cover and lower floor's powder plate; the Chemical Mixed Fertilizer outlet of described compound fertilizer cooler provided 26 is connected with the upper strata scalping of sieve apparatus 27; the middle level dusting cover of described sieve apparatus 27 is connected with film applicator 28; the upper strata scalping of described sieve apparatus 27 is connected with raw material chopper 23, and lower floor's powder plate of described sieve apparatus 27 is connected with tablets press 24.
By prefabricated manganese slag and various nitrogen, phosphorus, potassium base fertilizer (Repone K, phosphorus ammonium, urea, ammonium chloride and wilkinite etc.) by sending into mixer 22 uniform stirring after weighing and dispensing system 21 accurate measurement; mixed material is sent into raw material chopper 23 and is carried out fragmentation, and after broken, tablets press 24 sent into by material.Although the material major part after granulation forms particle, but now pellet moisture is high, intensity is low, the requirement of packed and transported cannot be met, work in-process after granulating and forming send into mixed fertilizer drying machine 25, the air mixed that coal gas is introduced with roasting kiln induced draft fan 201 in roasting kiln 20 is burnt and is produced warm air, carries out drying and processing from roasting kiln 20 warm air out to the material in mixed fertilizer drying machine 25.After drying, temperature of charge is higher, sends into compound fertilizer cooler provided 26, blasts air carry out cooling process by freezing air induced draft fan 202, improves granule strength further, reduces moisture.Cooling after material send into sieve apparatus 27 carry out airtight sub-sieve, macrobead returning charge sieve with dusting cover after raw material chopper 23 fragmentation under fine powder jointly return tablets press 24, again participate in granulation process, so circulate.The qualified work in-process sifted out are sent into film applicator 28 by lift and are carried out coating problems, and after film, finished product sends into metering packaging machine 29 metering packing by lift, obtains compound fertilizer product.
Fig. 3 is the structural representation of mixed fertilizer drying cooled exhaust gas treatment system, as shown in the figure, mixed fertilizer drying cooled exhaust gas treatment system comprises settling pocket 31, washing tower 32, settling tank 33 and clean water basin 34, oven dry offgas outlet pipeline and the cooled exhaust gas outlet conduit of compound fertilizer cooler provided 26 of described mixed fertilizer drying machine 25 converge and are connected with settling pocket 31 afterwards, the offgas outlet pipeline of described settling pocket 31 is connected with washing tower 32 bottom, described washing tower 32 top is connected with exhaust gas emission chimney, described clean water basin 34 are connected with tap water pipe network 35, described clean water basin 34 are connected with the sprinkling system in washing tower 32 by recycle pump 36, be connected with settling tank 33 bottom described washing tower 32, described settling tank 33 is connected with clear water 34.
Described settling pocket 31 is gravity settling chamber; Described settling tank 33 is two-stage settling tank, and upper level settling tank is connected with next stage settling tank by overflow port; Described washing tower 32 is packing tower.
Mixed fertilizer drying tail gas and Chemical Mixed Fertilizer cooled exhaust gas share a set of exhaust treatment system, and mixed fertilizer drying cooled exhaust gas is mainly containing Chemical Mixed Fertilizer dust, SO
2with a small amount of ammonia, first tail gas remove larger particles dust by settling pocket 31, then enter washing tower 32 water and carry out spray washing, and except can further except dedusting, can play desulfurization and the effect except ammonia, the tail gas after process be through exhaust gas emission smoke stack emission simultaneously.Washing tower 32 spray washing waste water is settled out sediment discharge at settling tank 33, and upper strata clear water flows into clean water basin 34 circulated sprinkling and uses.
What finally illustrate is, above preferred embodiment is only in order to illustrate the technical solution of the utility model and unrestricted, although be described in detail the utility model by above preferred embodiment, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from the utility model claims limited range.
Claims (10)
1. a coal gas comprehensive utilization manganese slag production of compound fertilizer system for environment-protecting clean, is characterized in that: comprise gas generating system, production of compound fertilizer system and mixed fertilizer drying cooled exhaust gas treatment system;
Described gas generating system comprises two stage type gas generating furnace, tar well, tornado dust collector, emergency switching-off device and stokehold water-sealed tank, described two stage type gas generating furnace comprises top belljar valve, top retort section body of heater, bottom gasification section body of heater and bottom ash-pan, described retort section body of heater is connected with tar well, described gasification section body of heater is connected with tornado dust collector, introduces stokehold water-sealed tank after the outlet conduit of described tar well and tornado dust collector converges by emergency switching-off device;
Described production of compound fertilizer system comprises roasting kiln induced draft fan, roasting kiln, weighing and dispensing system, mixer, raw material chopper, tablets press, mixed fertilizer drying machine, compound fertilizer cooler provided, freezing air induced draft fan, sieve apparatus, film applicator and metering packaging machine, described weighing and dispensing system, mixer, raw material chopper, tablets press, mixed fertilizer drying machine, compound fertilizer cooler provided, sieve apparatus, film applicator is connected successively with metering packaging machine, the gas exit pipeline of described stokehold water-sealed tank is connected with roasting kiln, the wind pipe of described roasting kiln induced draft fan is connected with roasting kiln, the hot air outlet pipeline of described roasting kiln is connected with mixed fertilizer drying machine, the wind pipe of described freezing air induced draft fan is connected with compound fertilizer cooler provided,
Described mixed fertilizer drying cooled exhaust gas treatment system comprises settling pocket, washing tower, settling tank and clean water basin, oven dry offgas outlet pipeline and the cooled exhaust gas outlet conduit of compound fertilizer cooler provided of described mixed fertilizer drying machine converge and are connected with settling pocket afterwards, the offgas outlet pipeline of described settling pocket is connected with washing tower bottom, described washing tower top is connected with exhaust gas emission chimney, described clean water basin are connected with tap water pipe network, described clean water basin are connected with the sprinkling system in washing tower by recycle pump, described wash tower bottoms is connected with settling tank, described settling tank is connected with clean water basin.
2. the coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean according to claim 1, it is characterized in that: described gas generating system also comprises drum and producer gas generator induced draft fan, described gasification section body of heater is provided with water holding jacket, described drum is connected with softening water pipe network, the water holding jacket entrance and exit of gasification section body of heater is connected with drum respectively, the steam outlet of drum is divided into two-way, one pass enters two stage type gas generating furnace and is used as sealing gland steam, the wind pipe of another road and producer gas generator induced draft fan converges bottom rear introducing two stage type gas generating furnace as vaporized chemical.
3. the coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean according to claim 1, it is characterized in that: described gas generating system also comprises residual gas flashback tank and water seal feedwater piping, service water pipe network is connected with residual gas flashback tank, ash-pan, emergency switching-off device and stokehold water-sealed tank respectively by water seal feedwater piping.
4. the coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean according to claim 1, is characterized in that: described mixer is all connected by rotary conveyor with between raw material chopper, between raw material chopper with tablets press and between tablets press with mixed fertilizer drying machine.
5. the coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean according to claim 1, is characterized in that: described mixed fertilizer drying machine is with between compound fertilizer cooler provided, be all connected by lift between compound fertilizer cooler provided with sieve apparatus, between sieve apparatus with film applicator and between film applicator with metering packaging machine.
6. the coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean according to claim 1, is characterized in that: described tablets press is rotary drum granulator.
7. the coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean according to claim 1, is characterized in that: described mixed fertilizer drying machine is rotary dryer.
8. the coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean according to claim 1, is characterized in that: described compound fertilizer cooler provided is rotary cooler.
9. the coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean according to claim 1; it is characterized in that: described sieve apparatus is made up of upper strata scalping, middle level dusting cover and lower floor's powder plate; the Chemical Mixed Fertilizer outlet of described compound fertilizer cooler provided is connected with the upper strata scalping of sieve apparatus; the middle level dusting cover of described sieve apparatus is connected with film applicator; the upper strata scalping of described sieve apparatus is connected with raw material chopper, and lower floor's powder plate of described sieve apparatus is connected with tablets press.
10. the coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean according to claim 1, it is characterized in that: described settling pocket is gravity settling chamber, described settling tank is two-stage settling tank, upper level settling tank is connected with next stage settling tank by overflow port, and described washing tower is packing tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420755659.3U CN204400858U (en) | 2014-12-05 | 2014-12-05 | The coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420755659.3U CN204400858U (en) | 2014-12-05 | 2014-12-05 | The coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean |
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| Publication Number | Publication Date |
|---|---|
| CN204400858U true CN204400858U (en) | 2015-06-17 |
Family
ID=53424737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420755659.3U Expired - Fee Related CN204400858U (en) | 2014-12-05 | 2014-12-05 | The coal gas comprehensive utilization manganese slag production of compound fertilizer system of environment-protecting clean |
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| Country | Link |
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2014
- 2014-12-05 CN CN201420755659.3U patent/CN204400858U/en not_active Expired - Fee Related
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Granted publication date: 20150617 Termination date: 20151205 |
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| EXPY | Termination of patent right or utility model |