CN113772734A - Method for recovering manganese and iron resources from manganese slag - Google Patents
Method for recovering manganese and iron resources from manganese slag Download PDFInfo
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- CN113772734A CN113772734A CN202111296592.2A CN202111296592A CN113772734A CN 113772734 A CN113772734 A CN 113772734A CN 202111296592 A CN202111296592 A CN 202111296592A CN 113772734 A CN113772734 A CN 113772734A
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- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title claims abstract description 91
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 239000011572 manganese Substances 0.000 title claims abstract description 87
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 87
- 239000002893 slag Substances 0.000 title claims abstract description 49
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 26
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 claims abstract description 53
- 229910000398 iron phosphate Inorganic materials 0.000 claims abstract description 49
- 238000002386 leaching Methods 0.000 claims abstract description 42
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 36
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 22
- 238000001035 drying Methods 0.000 claims abstract description 22
- 239000000047 product Substances 0.000 claims abstract description 19
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 18
- 239000002253 acid Substances 0.000 claims abstract description 16
- 238000005406 washing Methods 0.000 claims abstract description 15
- 238000001354 calcination Methods 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 13
- 238000004321 preservation Methods 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 239000011656 manganese carbonate Substances 0.000 claims abstract description 12
- 235000006748 manganese carbonate Nutrition 0.000 claims abstract description 12
- 229940093474 manganese carbonate Drugs 0.000 claims abstract description 12
- 229910001437 manganese ion Inorganic materials 0.000 claims abstract description 12
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 claims abstract description 12
- XMWCXZJXESXBBY-UHFFFAOYSA-L manganese(ii) carbonate Chemical compound [Mn+2].[O-]C([O-])=O XMWCXZJXESXBBY-UHFFFAOYSA-L 0.000 claims abstract description 12
- 239000002243 precursor Substances 0.000 claims abstract description 12
- 238000000926 separation method Methods 0.000 claims abstract description 12
- 239000002244 precipitate Substances 0.000 claims abstract description 11
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 239000002002 slurry Substances 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000000227 grinding Methods 0.000 claims abstract description 6
- 238000002791 soaking Methods 0.000 claims abstract description 6
- 239000007800 oxidant agent Substances 0.000 claims abstract description 5
- 230000001590 oxidative effect Effects 0.000 claims abstract description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 14
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- 238000001556 precipitation Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- WAEMQWOKJMHJLA-UHFFFAOYSA-N Manganese(2+) Chemical compound [Mn+2] WAEMQWOKJMHJLA-UHFFFAOYSA-N 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 4
- 239000002245 particle Substances 0.000 description 6
- 239000005955 Ferric phosphate Substances 0.000 description 4
- 229940032958 ferric phosphate Drugs 0.000 description 4
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- 229940099596 manganese sulfate Drugs 0.000 description 1
- 239000011702 manganese sulphate Substances 0.000 description 1
- 235000007079 manganese sulphate Nutrition 0.000 description 1
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G45/00—Compounds of manganese
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/37—Phosphates of heavy metals
- C01B25/375—Phosphates of heavy metals of iron
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/32—Spheres
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/11—Powder tap density
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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Abstract
The invention discloses a method for recovering manganese and iron resources from manganese slag, which comprises the following steps of (1) carrying out ore grinding treatment on the manganese slag; (2) carrying out acid leaching treatment on the ground powder, controlling the temperature at 40-85 ℃, soaking for 10-120 min, adding an oxidant to remove iron, and carrying out solid-liquid separation to obtain leaching slag and a leaching solution containing manganese ions; (3) adding the leaching residue into a phosphoric acid solution, reacting under a heating condition, filtering to obtain an iron phosphate solution, carrying out heat preservation treatment on the iron phosphate solution to obtain iron phosphate slurry, and carrying out solid-liquid separation to obtain an iron phosphate precursor; (4) washing, drying and calcining the iron phosphate precursor to obtain an iron phosphate product; (5) and adding sodium carbonate into the leaching solution containing manganese ions, and washing and drying the precipitate to obtain a manganese carbonate product. The method can effectively recover manganese and iron elements in the manganese slag, effectively treat the manganese slag and realize resource utilization, thereby solving the problem that the manganese slag pollutes the environment and realizing the recovery of valuable resources.
Description
Technical Field
The invention belongs to the technical field of manganese slag recovery, and relates to a method for recovering manganese and iron resources from manganese slag.
Background
Although the reserves of iron ore and manganese ore in China are rich and mainly lean ore, because the geochemical behaviors of iron and manganese are similar, the iron ore and the manganese ore are closely symbiotic frequently in the geological process, the average grade of the iron ore in China is 32 percent and is 11 percent lower than the average grade in the world, the average grade of the manganese ore in China is about 20 percent, and the reserve of the manganese ore is only 6.4 percent. Along with the increasing development of ores, the grades of manganese ores and iron ores in China are gradually reduced, the difference between the production demand and the storage capacity causes China to become the largest import country of the manganese ores and the iron ores in the world, and the shortage of manganese ore and iron ore resources becomes an important factor influencing the sustainable development of the manganese-iron industry.
China is the biggest world manganese production, consumption and export, and accounts for more than 90% of the total global manganese production. Manganese slag in the wet manganese industry is a general name for electrolytic manganese metal, manganese dioxide, and leached manganese slag, manganese sulfide slag and anode slag generated in the process of producing manganese sulfate products. The yield of manganese slag in China in 2019 is reported to exceed 2000 ten thousand tons.
At present, most domestic enterprises transport manganese ore residues to a storage yard for damming and stacking, and not only seriously damage the ecological environment but also waste manganese resources and iron resources in the manganese ore residues under the action of weathering leaching for a long time.
Therefore, how to economically and reasonably utilize manganese and iron resources in the manganese slag has very important significance for relieving the current contradiction that the manganese ore resources and the iron ore resources in China are in short supply, reducing the environmental harm of the manganese slag and ensuring the sustainable development of the economy in China.
Disclosure of Invention
The invention aims to provide a method for recovering manganese and iron resources from manganese slag, which can simultaneously recover manganese and iron elements in the manganese slag.
The invention provides a method for recovering manganese and iron resources from manganese slag, which comprises the following steps:
(1) grinding the manganese slag to obtain powder with preset fineness;
(2) performing acid leaching treatment on the ground powder, adopting dilute sulfuric acid as acid leaching solution, controlling the temperature at 40-85 ℃, soaking for 10-120 min, adding an oxidant to remove iron, and performing solid-liquid separation to obtain leaching slag and leaching solution containing manganese ions;
(3) adding the leaching residue obtained in the step (2) into a phosphoric acid solution, reacting under a heating condition, filtering to obtain an iron phosphate solution, carrying out heat preservation treatment on the iron phosphate solution to obtain iron phosphate slurry, and carrying out solid-liquid separation to obtain an iron phosphate precursor;
(4) washing, drying and calcining the iron phosphate precursor to obtain an iron phosphate product;
(5) and (3) adding sodium carbonate into the manganese ion-containing leachate obtained in the step (2) to enable manganese elements to generate a precipitation reaction, and washing and drying the precipitate to obtain a manganese carbonate product.
Preferably, in the step (1), the fineness of the powder with the preset fineness is-0.075 mm and accounts for more than 85%.
Preferably, in the step (2), the mass concentration of the dilute sulfuric acid is 5-10%.
In the preferable scheme, in the step (2), the stirring speed is 60-200 r/min in the acid leaching process.
Preferably, in the step (2), the oxidant is one or two of oxygen and hydrogen peroxide.
Preferably, in the step (3), the mass concentration of the phosphoric acid is 10-40%, and the molar ratio of the phosphoric acid to the iron in the leaching slag is (1.0-1.3): 1.
preferably, in the step (3), the leaching residue is added into a phosphoric acid solution, heated to 80-100 ℃, and reacted for 1-5 hours.
According to the preferable scheme, in the step (3), the iron phosphate solution is subjected to heat preservation treatment, the heat preservation temperature is 70-90 ℃, the heat preservation time is 0.5-4 h, and the iron phosphate solution is subjected to hydrolysis and precipitation through the heat preservation treatment to obtain the iron phosphate slurry.
Preferably, in the step (4), the ferric phosphate precipitate is washed by pure water.
In the preferable scheme, in the step (4), the drying temperature is 80-100 ℃, and the drying time is 1-8 hours.
In the preferable scheme, in the step (4), the calcining treatment temperature is 500-800 ℃, and the calcining time is 2-6 h.
Preferably, in the step (5), the molar ratio of the sodium carbonate to the manganese in the leaching solution is (1.0-1.2): 1.
compared with the prior art, the invention has the beneficial technical effects that:
the invention provides a method for recovering manganese and iron resources from manganese slag, which can effectively recover manganese and iron elements in the manganese slag, effectively treat the manganese slag and realize resource utilization, thereby solving the problem of environmental pollution of the manganese slag, improving the production benefit of enterprises and realizing the recovery of valuable resources.
Drawings
FIG. 1 is a process flow diagram of example 1 of the present invention;
fig. 2 is an SEM image of iron phosphate prepared in example 1 of the present invention;
FIG. 3 is an SEM photograph of manganese carbonate prepared in example 1 of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
In this example, unless otherwise specified, all reagents used were common commercial products or prepared by conventional means, and the equipment used was conventional in the art, and the following are some examples of the inventors in the experiment:
in the specific embodiment of the invention, the main components (mass percent) of the manganese slag are as follows: mn (30-50%), Fe (2-10%) and S (3-8%).
Example 1
A method for recovering manganese and iron resources from manganese slag comprises the following steps:
(1) grinding the manganese slag to obtain powder with a particle size of-0.075 mm accounting for more than 85%;
(2) performing acid leaching treatment on the ground powder, adopting dilute sulfuric acid with the mass concentration of 5% as acid leaching solution, controlling the temperature at 65 ℃, soaking for 40min, stirring at 80r/min, adding hydrogen peroxide to remove iron after acid leaching, and performing solid-liquid separation to obtain leaching residue and leaching solution containing manganese ions;
(3) adding the leaching residue obtained in the step (2) into a phosphoric acid solution, wherein the mass concentration of phosphoric acid is 30%, the molar ratio of phosphoric acid to iron in the leaching residue is 1.1:1, reacting under a heating condition, heating to 90 ℃, reacting for 2 hours, filtering to obtain an iron phosphate solution, carrying out heat preservation treatment on the iron phosphate solution, keeping the temperature at 80 ℃, keeping the temperature for 2 hours to obtain an iron phosphate slurry, and carrying out solid-liquid separation to obtain an iron phosphate precursor;
(4) washing, drying and calcining the iron phosphate precursor to obtain an iron phosphate product;
washing the ferric phosphate precipitate by using pure water; the drying temperature is 90 ℃, and the drying time is 6 hours; calcining at 600 ℃ for 4h to obtain an iron phosphate product;
(5) adding sodium carbonate into the leachate containing manganese ions obtained in the step (2), wherein the molar ratio of the sodium carbonate to manganese in the leachate is 1.2:1, carrying out precipitation reaction on manganese element, washing and drying the precipitate to obtain a manganese carbonate product.
Example 2
A method for recovering manganese and iron resources from manganese slag comprises the following steps:
(1) grinding the manganese slag to obtain powder with a particle size of-0.075 mm accounting for more than 85%;
(2) performing acid leaching treatment on the ground powder, adopting dilute sulfuric acid with the mass concentration of 5% as acid leaching solution, controlling the temperature at 85 ℃, soaking for 20min, stirring at the speed of 120r/min, adding oxygen to remove iron after acid leaching, and performing solid-liquid separation to obtain leaching residue and leaching solution containing manganese ions;
(3) adding the leaching residue obtained in the step (2) into a phosphoric acid solution, wherein the mass concentration of phosphoric acid is 10%, the molar ratio of phosphoric acid to iron in the leaching residue is 1.3:1, reacting under a heating condition, heating to 80 ℃, reacting for 5 hours, filtering to obtain an iron phosphate solution, carrying out heat preservation treatment on the iron phosphate solution, keeping the temperature at 70 ℃, keeping the temperature for 4 hours to obtain an iron phosphate slurry, and carrying out solid-liquid separation to obtain an iron phosphate precursor;
(4) washing, drying and calcining the iron phosphate precursor to obtain an iron phosphate product;
washing the ferric phosphate precipitate by using pure water; the drying temperature is 100 ℃, and the drying time is 4 hours; calcining at 500 ℃ for 6h to obtain an iron phosphate product;
(5) adding sodium carbonate into the leachate containing manganese ions obtained in the step (2), wherein the molar ratio of the sodium carbonate to manganese in the leachate is 1.1:1, carrying out precipitation reaction on manganese element, washing and drying the precipitate to obtain a manganese carbonate product.
Example 3
A method for recovering manganese and iron resources from manganese slag comprises the following steps:
(1) grinding the manganese slag to obtain powder with a particle size of-0.075 mm accounting for more than 85%;
(2) performing acid leaching treatment on the ground powder, adopting dilute sulfuric acid with the mass concentration of 5% as acid leaching solution, controlling the temperature at 45 ℃, soaking for 100min, stirring at the speed of 60r/min, adding hydrogen peroxide to remove iron after acid leaching, and performing solid-liquid separation to obtain leaching residue and leaching solution containing manganese ions;
(3) adding the leaching residue obtained in the step (2) into a phosphoric acid solution, wherein the mass concentration of phosphoric acid is 40%, the molar ratio of phosphoric acid to iron in the leaching residue is 1.2:1, reacting under a heating condition, heating to 98 ℃, reacting for 1h, filtering to obtain an iron phosphate solution, carrying out heat preservation treatment on the iron phosphate solution, keeping the temperature at 90 ℃, keeping the temperature for 0.5h to obtain iron phosphate slurry, and carrying out solid-liquid separation to obtain an iron phosphate precursor;
(4) washing, drying and calcining the iron phosphate precursor to obtain an iron phosphate product;
washing the ferric phosphate precipitate by using pure water; the drying temperature is 80 ℃, and the drying time is 8 hours; calcining at 800 ℃ for 2h to obtain an iron phosphate product;
(5) adding sodium carbonate into the leachate containing manganese ions obtained in the step (2), wherein the molar ratio of the sodium carbonate to manganese in the leachate is 1.1:1, carrying out precipitation reaction on manganese element, washing and drying the precipitate to obtain a manganese carbonate product.
The following physical and chemical properties of the iron phosphate and manganese carbonate prepared in examples 1 to 3 of the present invention were measured, specifically as follows:
table 1 various performance test data of iron phosphate
Table 2 various performance test data of manganese carbonate
As can be seen from tables 1-2, the method for recovering manganese and iron resources from manganese slag of the present invention effectively treats and recycles manganese slag, not only solves the problem of environmental pollution caused by waste, but also realizes the recovery of valuable resources, and prepares high-purity iron phosphate products and manganese carbonate products, and the prepared iron phosphate particles have good uniformity and smooth surfaces, and the microscopic morphology is shown in fig. 2; the prepared manganese carbonate is spherical, the particle size of the particles is 0.5-2um, and the micro-morphology of the manganese carbonate is shown in figure 3.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A method for recovering manganese and iron resources from manganese slag is characterized by comprising the following steps:
(1) grinding the manganese slag to obtain powder with preset fineness;
(2) performing acid leaching treatment on the ground powder, adopting dilute sulfuric acid as acid leaching solution, controlling the temperature at 40-85 ℃, soaking for 10-120 min, adding an oxidant to remove iron, and performing solid-liquid separation to obtain leaching slag and leaching solution containing manganese ions;
(3) adding the leaching residue obtained in the step (2) into a phosphoric acid solution, reacting under a heating condition, filtering to obtain an iron phosphate solution, carrying out heat preservation treatment on the iron phosphate solution to obtain iron phosphate slurry, and carrying out solid-liquid separation to obtain an iron phosphate precursor;
(4) washing, drying and calcining the iron phosphate precursor to obtain an iron phosphate product;
(5) and (3) adding sodium carbonate into the manganese ion-containing leachate obtained in the step (2) to enable manganese elements to generate a precipitation reaction, and washing and drying the precipitate to obtain a manganese carbonate product.
2. The method for recovering manganese and iron resources from manganese slag according to claim 1, wherein in the step (1), the fineness of the powder with the predetermined fineness is-0.075 mm and accounts for more than 85%.
3. The method for recovering manganese and iron resources from manganese slag according to claim 1, wherein in the step (2), the mass concentration of the dilute sulfuric acid is 5-10%; in the acid leaching process, the stirring speed is 60-200 r/min.
4. The method for recovering manganese and iron resources from manganese slag according to claim 1, wherein in the step (2), the oxidant is one or two of oxygen and hydrogen peroxide.
5. The method for recovering manganese and iron resources from manganese slag according to claim 1, wherein in the step (3), the mass concentration of the phosphoric acid is 10-40%, and the molar ratio of the phosphoric acid to iron in the leached slag is (1.0-1.3): 1.
6. the method for recovering manganese and iron resources from manganese slag according to claim 1, wherein in the step (3), the leached slag is added into a phosphoric acid solution, and the temperature is heated to 80-100 ℃ for 1-5 h.
7. The method for recovering manganese and iron resources from manganese slag according to claim 1, wherein in the step (3), the iron phosphate solution is subjected to heat preservation treatment, the heat preservation temperature is 70-90 ℃, and the heat preservation time is 0.5-4 hours.
8. The method for recovering manganese and iron resources from manganese slag according to claim 1, wherein in the step (4), the iron phosphate precipitate is washed with pure water;
the drying temperature is 80-100 ℃, and the drying time is 1-8 h;
the calcining treatment temperature is 500-800 ℃, and the calcining time is 2-6 h.
9. The method for recovering manganese and iron resources from manganese slag according to claim 1, wherein in the step (5), the molar ratio of sodium carbonate to manganese in the leachate is (1.0-1.2): 1.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114394771A (en) * | 2022-01-04 | 2022-04-26 | 广西大学 | Method for resource utilization of manganese ore slag generated in manganese sulfate production process |
| CN115092923A (en) * | 2022-08-10 | 2022-09-23 | 六盘水师范学院 | Comprehensive recovery and recycling method for waste dry batteries |
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| CN104944400A (en) * | 2015-07-20 | 2015-09-30 | 河北工业大学 | Technology for preparing iron phosphate through hydrolytic method |
| CN105152153A (en) * | 2015-09-22 | 2015-12-16 | 赵阳臣 | Comprehensive recycling method for leaching residues in electrolytic manganese metal production |
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