CN112210635B - Method for preparing ferromolybdenum by adopting molybdenum concentrate and pyrite - Google Patents
Method for preparing ferromolybdenum by adopting molybdenum concentrate and pyrite Download PDFInfo
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- CN112210635B CN112210635B CN202010994995.3A CN202010994995A CN112210635B CN 112210635 B CN112210635 B CN 112210635B CN 202010994995 A CN202010994995 A CN 202010994995A CN 112210635 B CN112210635 B CN 112210635B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/30—Obtaining chromium, molybdenum or tungsten
- C22B34/34—Obtaining molybdenum
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Abstract
The invention discloses a method for preparing ferromolybdenum by adopting molybdenum concentrate and pyrite, belongs to the technical field of molybdenum metallurgy, and solves the problems of long preparation process, complex process and much pollution of the ferromolybdenum in the prior art. The method comprises the following steps: s1, mixing and evenly mixing the raw material molybdenum concentrate and pyrite, adding a binder to form pellets or blocks, and using the pellets or blocks as a mixture to be smelted; step S2, drying the formed pellets or blocks; s3, placing the pellets or blocks into a high-temperature vacuum furnace for smelting; and step S4, cooling the smelted ferromolybdenum alloy liquid and the slag to obtain ferromolybdenum. The method has the advantages of short preparation flow, low energy consumption, no pollution and high yield of molybdenum.
Description
Technical Field
The invention belongs to the technical field of molybdenum metallurgy, and particularly relates to a method for preparing ferromolybdenum from molybdenum concentrate and pyrite.
Background
The ferromolybdenum is an important product in the molybdenum industry and is mainly used for smelting molybdenum-containing steel. Currently, the main smelting method of ferromolybdenum adopts an external method for preparation, and the main raw material adopts industrial molybdenum oxide; the heating agent comprises aluminum powder, silicon powder, ferrosilicon powder and saltpeter; the fluxing agent comprises fluorite, quicklime and the like.
Because the external furnace method belongs to intermittent production, the total smelting energy consumption is high, and the addition amount of the heating agent objectively far exceeds the heat required by ferromolybdenum smelting. For many years, ferromolybdenum smelting has therefore always been on the edge of a profit or loss. In addition, the environment of the ferromolybdenum smelting process is poor, and although the dust removal equipment is improved in recent years, the current situation that the ferromolybdenum smelting environment is severe cannot be fundamentally changed.
In addition, the energy consumption and pollution of the preparation process of various raw materials in ferromolybdenum smelting are serious. For example, the preparation process of industrial molybdenum oxide needs to use natural gas (or coal powder) as fuel, and the oxidizing roasting process generates a large amount of SO2。SO2If notThe ecological environment is affected by the direct discharge of the treatment; if the treatment is carried out, the investment is large, the economic burden is high in the treatment process, and secondary hazardous wastes and other adverse results are generated. Therefore, the existing ferromolybdenum preparation process has long flow, relatively complex process, high energy consumption and high pollution.
Therefore, a new process for smelting ferromolybdenum with ecological and low cost is needed.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a method for preparing ferromolybdenum from molybdenum concentrate and pyrite, so as to solve one of the following technical problems: (1) in the prior art, the preparation process of ferromolybdenum is long and the process is relatively complex; (2) the cost is high and the energy consumption is high; (3) and the environment is polluted, etc.
The invention is mainly realized by the following technical scheme:
in one aspect, the invention discloses a method for preparing ferromolybdenum by adopting molybdenum concentrate and pyrite, which comprises the following steps:
s1, mixing and evenly mixing the raw materials of the molybdenum concentrate and the pyrite, adding a binder to form pellets or blocks, and taking the pellets or blocks as a mixture to be smelted;
step S2, drying the formed pellets or blocks;
s3, placing the pellets or blocks into a high-temperature vacuum furnace for smelting;
and step S4, cooling the smelted ferro-molybdenum alloy liquid and the slag to obtain ferro-molybdenum.
In one possible design, in step S1, the molybdenum concentrate and the pyrite are both in powder form and have a particle size of 30 to 100 microns.
In one possible design, in step S1, the addition amount of the binder is 0.5% to 5% of the total mass of the molybdenum concentrate and the pyrite.
In one possible design, in the step S1, the pellet or block has a particle size of 3mm to 15 mm.
In one possible design, in step S2, the mass fraction of the moisture in the dried pellets is 1% or less.
In one possible design, in step S2, the drying temperature is 100 to 400 ℃.
In a possible design, in the step S3, the smelting temperature is 1500-2000 ℃, the vacuum degree is 1-500 Pa, and the smelting time is 60-240 min.
In one possible design, ferromolybdenum containing 10-50% of molybdenum by mass percent is smelted, the smelting temperature is 1500-1700 ℃, and the vacuum degree is 1-200 Pa.
In one possible design, ferromolybdenum containing more than 50% of molybdenum by mass is smelted, the smelting temperature is more than 1600 ℃, and the vacuum degree is 50-500 Pa.
In a possible design, step S4 further includes recovering sulfur from the volatile.
Compared with the prior art, the invention can at least realize one of the following technical effects:
1) the method prepares the ferromolybdenum by smelting the molybdenum concentrate and the pyrite under the vacuum high-temperature condition without preparing molybdenum oxide first, has short preparation flow, low energy consumption, high molybdenum yield (more than 99 percent) and no SO2The method has no pollution, and belongs to a novel process for smelting ferromolybdenum with ecological type, high efficiency and low cost.
2) The invention carries out smelting on the molybdenum concentrate and the pyrite under the vacuum high-temperature condition to obtain sulfur vapor, the sulfur vapor is condensed into solid sulfur, and the solid sulfur can be directly used as a product. By adopting the mode, the emission of sulfur dioxide can be avoided, and the income can be increased for enterprises. Therefore, the technical scheme provided by the invention solves the problems of high energy consumption and high pollution in the traditional ferromolybdenum production process, realizes the smelting of ferromolybdenum with ecology, low energy consumption and low cost, and has higher economic value.
3) The invention ensures that the ferromolybdenum meeting the national standard is prepared by comprehensively controlling the size, the water content, the smelting temperature, the vacuum degree, the time and other steps and parameters of the pellets after pelletizing.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description.
Detailed Description
A method for preparing ferromolybdenum using molybdenum concentrate and pyrite will be described in further detail below with reference to specific examples, which are provided for comparison and explanation purposes only, and the present invention is not limited thereto.
In the prior art, the raw materials generally adopted for ferromolybdenum smelting comprise molybdenum oxide, iron oxide, a heating agent and a fluxing agent. The energy consumption and pollution of the preparation process of various raw materials in ferromolybdenum smelting are serious. For example, the preparation process of industrial molybdenum oxide needs to use natural gas (or coal powder) as fuel, and the oxidizing roasting process generates a large amount of SO2。SO2If the direct discharge is not processed, the ecological environment is affected; if the treatment is carried out, the investment is large, the economic burden is high in the treatment process, and secondary hazardous wastes and other adverse results are generated. Therefore, the existing ferromolybdenum preparation process has long flow, relatively complex process, high energy consumption and high pollution.
According to the analysis of the components of the molybdenum concentrate, the main component of the molybdenum concentrate is MoS2Along with gangue and other colored impurities, the grade of molybdenum is usually about 45% (mass percent), the grade of ore with higher grade can reach 55% (mass percent), and the grade of ore with lower grade is about 35% (mass percent). The main elements of the pyrite are sulfur and iron, and the sum of the mass percent of the sulfur and the mass percent of the iron is between 90 and 99 percent.
The applicant has found that the use of molybdenum concentrate and pyrite for the smelting of ferromolybdenum is undoubtedly the best choice for using direct resources and using less secondary resources (such as aluminum, ferrosilicon, etc.). And the molybdenum concentrate and the pyrite are uniformly mixed and formed according to a certain proportion, the mixture is smelted in a vacuum smelting furnace, molybdenum sulfide and iron sulfide are decomposed into metal molybdenum, metal iron and elemental sulfur, the molybdenum sulfide and the iron sulfide are sintered (or melted) into ferromolybdenum, gangue in the ore is gathered in a liquid phase form and is layered with the ferromolybdenum, ferromolybdenum with various specifications can be obtained by adjusting the mass ratio of the molybdenum concentrate to the pyrite, and the decomposed sulfur is condensed and recovered to obtain a sulfur product.
The invention provides a method for preparing ferromolybdenum by adopting molybdenum concentrate and pyrite, which comprises the following steps:
and step S1, mixing and evenly mixing the raw materials of the molybdenum concentrate and the pyrite, adding a binder for forming, and preparing pellets or blocks with the particle size of 3-15 mm as a mixture to be smelted.
Specifically, in step S1, it is considered that the volatile gas in the vacuum furnace easily takes unreacted powdery raw material out of the vacuum furnace during smelting, and the smelting efficiency is lowered. In order to solve the problems, in the embodiment of the invention, after the molybdenum concentrate and the pyrite are uniformly mixed, the binder is added for forming, and the fragile powder is made into the pellets or blocks with the particle size of 3-15 mm by adding the binder, so that the raw materials can be prevented from being brought out of the vacuum furnace, and the molybdenum concentrate and the pyrite can be fully reacted. Wherein, ore grinding is needed before mixing, and the molybdenum concentrate and the pyrite are ensured to be powdery with the granularity of 30-100 microns so as to be uniformly mixed.
Specifically, in step S1, the adhesive includes: an inorganic binder and/or an organic binder, preferably, the inorganic binder comprises: at least one of powdery bentonite, water glass and lime inorganic binder. The organic binder includes: at least one of sodium carboxymethylcellulose, waste syrup and starch. In order to ensure that good-quality pellets are prepared and no binder is wasted, the addition amount of the binder is 0.5-5 percent, such as 1 percent, 2 percent, 3 percent and 4 percent, of the total mass of the molybdenum concentrate and the pyrite, and is specifically determined according to whether minerals are easy to be agglomerated into particles.
Specifically, in step S1, in order to reduce new impurities substituted by the inorganic binder or the mixed binder, the purity of the ferromolybdenum product is affected; the binder is selected from organic binder, such as at least one of sodium carboxymethylcellulose, waste syrup, and starch.
Specifically, in step S1, a rotary granulator is used to perform pelletizing; or a briquetting machine is adopted to directly press the materials into blocks in a mould. Considering that the energy consumption for smelting ferromolybdenum is also related to the particle size of the formed pellets or blocks, the particles are too large, the time required for smelting is long, and the particles are too small, so that dust entrainment is easily formed. Therefore, the particle size of the pellet or block is controlled to be 3-15 mm.
Step S2, drying the molded pellets or blocks to reduce the water content to below 1% (mass percentage).
Specifically, in step S2, the molded pellets or blocks are placed in a drying device for drying. Over-high drying temperature can cause the sulfur to react with air to form SO2(ii) a Too low can cause long drying time and reduce production efficiency; therefore, the drying temperature is controlled to be 100-400 ℃. Illustratively, the drying temperature is controlled to be 100 deg.C, 150 deg.C, 200 deg.C, 250 deg.C, 300 deg.C, 350 deg.C.
Specifically, in step S2, since too high moisture may affect the operation of the vacuum system, the mass fraction of moisture is controlled to be 1% or less. Illustratively, the temperature is controlled at 280 ℃ and the water content is 0.5%. The temperature is controlled at the above temperature to achieve rapid dehydration. The mass fraction of the water is controlled to be less than 1% so as to reduce the energy consumed by water gasification during smelting and reduce the water in the obtained sulfur simple substance.
And S3, placing the pellets or blocks into a high-temperature vacuum furnace for smelting, wherein the smelting temperature is 1500-2000 ℃, the vacuum degree is controlled to be 1-500 Pa, and the smelting time is 60-240 min.
Specifically, the ferromolybdenum which contains 10-70% of molybdenum by mass and meets the national standard GB/T3649-2008 can be obtained according to the grades of molybdenum in the molybdenum concentrate and iron in pyrite and the batching proportion of the two raw materials. The mass percentage of molybdenum in the ferromolybdenum mainly depends on the grade of raw materials and the mixing ratio of two kinds of mineral powder. The melting point of ferromolybdenum is 1400-1950 deg.C. Therefore, in step S3, the vacuum melting temperature is controlled to 1500-2000 ℃, the vacuum degree is controlled to 1-500 Pa (preferably 30-400 Pa), and the melting time is controlled to 60-240 min. For example, for a raw material with low total molybdenum content, the smelting temperature is 1500-1700 ℃, the vacuum degree is 1-200 Pa, and ferromolybdenum with lower molybdenum content by mass percent (molybdenum by mass percent is 10-50%) is obtained by smelting; and for the raw materials with high total molybdenum content, smelting at a temperature higher than 1600 ℃, selecting a vacuum degree of 50-500 Pa, and smelting to obtain ferromolybdenum with molybdenum content of more than 50% by mass.
Specifically, in step S3, in order to prevent generation of pollutant gases such as sulfur dioxide, smelting is performed in a vacuum furnace, so that elemental sulfur in the raw material is converted into elemental sulfur. Under the high temperature condition of 1500-2000 ℃, sulfides such as elemental sulfur, PdS and the like can be converted into gaseous volatiles, so that elemental sulfur, the sulfides and the molten ferromolybdenum alloy liquid are completely separated, and the smelting efficiency and the recovery rate of the elemental sulfur are improved.
Specifically, in the step S3, the reaction principle in the smelting process is as follows:
MoS2→Mo+S2(g)
FeS2→Fe+S2(g)
and step S4, cooling the smelted hot ferro-molybdenum alloy liquid and the slag to obtain ferro-molybdenum which meets the national standard requirements and contains less than 0.1 percent of S and 10 to 70 percent of molybdenum by mass percent.
Specifically, in step S4, the method further includes that the gangue in the molybdenum concentrate is collected in the form of liquid-phase slag and is layered with the ferromolybdenum (the slag has a lower density and floats on the surface of the alloy liquid, and the slag can be poured first to realize separation), so that the ferromolybdenum and the gangue can be layered to obtain ferromolybdenum; meanwhile, the decomposed sulfur gas is directly converted into liquid sulfur from gaseous sulfur vapor by adopting a vacuum liquefaction condensation mode, specifically, the gaseous sulfur vapor is converted into liquid sulfur by adopting a liquefied cooling medium, and the liquefied cooling medium can adopt liquid media such as oil and liquid sulfur. The liquefied cooling medium maintains the cooling temperature within the range of 160-220 ℃. In the implementation, the sulfur vapor is converted into liquid sulfur when passing through equipment in the range of 160-220 ℃ under the vacuum condition in an indirect (the liquefied cooling medium is not contacted with the sulfur vapor) or direct liquefied condensation (the liquefied cooling medium is contacted with the sulfur vapor), so that the recovery of the sulfur is realized. Specifically, the preferable conditions for recovering the sulfur are 160-220 ℃ and 50-200 Pa. The above conditions are based on a sulfur three-phase diagram, and if the temperature is too high or too low, the recovery rate may be too low or not.
Specifically, in the step S4, a high-temperature discharging manner may be adopted, and the smelted hot ferromolybdenum and the smelted slag are directly poured out under a vacuum condition or discharged from the bottom to enter a cooling section for cooling; the cooling section is an independent vacuum chamber at the lower part or the side part of the vacuum furnace, but no heating is carried out, when the smelting is finished, in order to realize the quasi-continuous smelting of the vacuum smelting, the heating container is directly moved to the cooling section or the cooling chamber, so that the material can be newly added into the original heating furnace to carry out the smelting of the next furnace. In the cooling section, the cooling can be accelerated by introducing protective gas and the like, and finally the product is taken out.
Specifically, in step S4, an intermittent discharging manner may be adopted, that is, the ferromolybdenum is taken out after being gradually cooled down along with the furnace after being smelted.
Specifically, in the above step S4, the slag can be used for preparing building materials such as glass ceramics and cement.
It should be noted that the key point of the invention is how to select the raw materials for preparing ferromolybdenum, the size of the pellet obtained by pelletizing, the moisture of the dried pellet, the smelting temperature, the vacuum degree and the smelting time, and the selection of each step and parameter of the invention is designed after being compatible with the whole scheme. Through the accurate control of each step and parameter, the qualified ferromolybdenum with the molybdenum content of 10-70 percent by mass can be ensured to be prepared, and the comprehensive recovery rate of the molybdenum is more than 99 percent and can reach 100 percent.
Compared with the prior art, the method prepares the ferromolybdenum through smelting the molybdenum concentrate and the pyrite under the vacuum high-temperature condition, does not need to prepare molybdenum oxide first, and has the advantages of short preparation flow, low energy consumption, high molybdenum yield and no SO2The method has no pollution, and belongs to a novel process for smelting ferromolybdenum with ecological type, high efficiency and low cost.
The invention carries out smelting on the molybdenum concentrate and the pyrite under the vacuum high-temperature condition to obtain sulfur vapor, the sulfur vapor is condensed into solid sulfur, and the solid sulfur can be directly used as a product. By adopting the mode, the emission of sulfur dioxide can be avoided, and the income can be increased for enterprises. Therefore, the technical scheme provided by the invention solves the problems of high energy consumption and high pollution in the traditional ferromolybdenum production process, realizes the smelting of ferromolybdenum with ecology, low energy consumption and low cost, and has higher economic value.
The present invention will be described in detail with reference to the following embodiments in order to make the above objects, features and advantages of the present invention more comprehensible. The following examples are intended to illustrate the invention without further limiting it. The present invention can be embodied in many different forms other than those herein described and many modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.
Example 1:
this example provides a method for preparing ferromolybdenum from molybdenum concentrate and pyrite. The molybdenum concentrate comprises the following components in percentage by mass: mo: 51.3%, S: 36.9% and SiO2：9％、CaO：1.5％、Cu：0.1％、Fe：0.8％、P：0.04％、Pb：0.2％。
The pyrite used in the embodiment comprises the following main components in percentage by mass: fe: 46.5%, S: 52.4 percent.
In the embodiment, a disc pelletizer is used for pelletizing to form pellets with the granularity of 5-11 mm, and then the pellets are dried in a drying oven to reduce the moisture content to below 1% (mass percentage content). Wherein the drying temperature is 150 ℃.
Smelting in a quasi-continuous smelting high-temperature vacuum furnace, controlling raw materials in each furnace at 100 kg, allowing sulfur gas to escape from a vacuum smelting area and enter a sulfur condenser for condensation to obtain liquid sulfur, wherein the sulfur trapping agent is liquid oil, the liquid sulfur is condensed to obtain solid sulfur, and the temperature of the recovered sulfur is 180 ℃ and the pressure is 100 Pa. After the ferromolybdenum smelting is finished, the ferromolybdenum is moved out of the high-temperature smelting area under the vacuum condition to be cooled.
The smelting conditions and the quality of the obtained product are shown in Table 1. The product quality only lists the contents of alloy elements, and the balance is the iron content.
TABLE 1 smelting conditions and product quality
Comparative example 1:
the present comparative example provides a method of preparing ferromolybdenum: namely, the ferro-molybdenum is smelted by an oxidizing roasting-metal heat reduction furnace external method adopted by the current mainstream production flow. The same molybdenum concentrate as in example 1 was used, and the components of the molybdenum concentrate in mass percent included: mo: 51.3%, S: 36.9% and SiO2：9％、CaO：1.5％、Cu：0.1％、Fe：0.8％、P：0.04％、Pb：0.2％。
Adding the molybdenum concentrate into a roasting furnace, and directly treating by adopting an oxidizing roasting method, wherein the granularity of mineral powder of the molybdenum concentrate is about 0.2mm, the roasting temperature is 650 ℃, and the molybdenum concentrate is oxidized into industrial molybdenum oxide (MoO) through roasting3) Residual sulfur S in industrial molybdenum oxide: 0.5%, Mo: 58.43% MoO3：52.93％、MoO2：29.53％、SiO2: 13.84%, Cu: 0.15%, Fe: 1.23 percent. The recovery of molybdenum was 98.5%. SO in flue gas2The content is about 2%. Then mixing industrial molybdenum oxide with ferrosilicon, iron scale, metallic aluminum and CaF2Mixing according to the ratio of 100:10:3:4:2, wherein the ferrosilicon adopts 75 ferrosilicon and the granularity is less than 80 meshes, the metallic aluminum adopts aluminum particles with the aluminum content of more than 99 percent and the granularity of less than 3mm, the grade of iron scale is more than 65 percent, and the granularity is less than 5 mm. The calcium fluoride is more than 80 percent, and the particle size is less than 40 meshes of fluorite powder. According to the method, a proper amount of scrap steel and CaO are supplemented, then the mixture is paved on a sand nest, ignited, and the ferro-molybdenum alloy is directly obtained by utilizing the aluminothermic reduction characteristic. The reaction in the process is violent, the reaction impact height is 2-3 m, a large amount of smoke overflows, dust is collected, the field environment is very poor, and the recovery rate of molybdenum metal is directly influenced. The recovered smoke dust returns to the batching process. The molybdenum yield of the working procedure is about 98.5 percent, the two working procedures of roasting and alloy smelting are integrated, and the total smelting recovery rate is about 97 percent.
By comparing example 1 with comparative example1, the ferromolybdenum meeting the national standard requirements can be prepared by accurately controlling the raw materials and combining the steps and parameters of the pellet size, the water content, the smelting temperature, the vacuum degree, the time and the like after pelletizing. The preparation method is short in process, high in efficiency and simple in process. The invention adopts a vacuum smelting process, directly obtains the ferro-molybdenum alloy in one step, has high yield of molybdenum and no SO2No pollution. The traditional process adopts an oxidizing roasting-metal thermal reduction furnace external method to prepare the ferro-molybdenum alloy, and the oxidizing roasting can not avoid SO2The generation of the molybdenum is not easy to control in the metal thermal reduction process, the smoke dust amount is large, and the comprehensive recovery rate of the molybdenum in the traditional process is about 97 percent and is less than 99 percent of that in the application.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (3)
1. A method for preparing ferromolybdenum by using molybdenum concentrate and pyrite is characterized by comprising the following steps:
s1, mixing and evenly mixing the raw materials of the molybdenum concentrate and the pyrite, adding a binder to form pellets or blocks, and taking the pellets or blocks as a mixture to be smelted;
step S2, drying the formed pellets or blocks;
s3, placing the pellets or blocks into a high-temperature vacuum furnace for smelting;
step S4, cooling the smelted ferro-molybdenum alloy liquid and the slag to obtain ferro-molybdenum;
in the step S1, the pellet or block has a particle size of 3-15 mm;
in the step S2, the mass fraction of water in the dried pellets is 1% or less;
in the step S2, the drying temperature is 100-400 ℃;
in the step S3, the smelting time is 60-240 min; smelting the obtained ferromolybdenum with the molybdenum content of more than 50% by mass, wherein the smelting temperature is more than 1600 ℃, and the vacuum degree is 50-500 Pa; smelting the obtained ferromolybdenum containing 10-50% of molybdenum by mass, wherein the smelting temperature is 1500-1700 ℃, and the vacuum degree is 1-200 Pa;
and S4, recovering sulfur from the volatile matter, and directly converting gaseous sulfur vapor into liquid sulfur by adopting a vacuum liquefaction condensation mode, wherein the temperature of the recovered sulfur is 160-220 ℃, and the pressure of the recovered sulfur is 50-200 Pa.
2. The method for preparing ferromolybdenum according to claim 1, wherein in step S1, both the molybdenum concentrate and the pyrite are in powder form and have a particle size of 30-100 μm.
3. The method for preparing ferromolybdenum according to claim 1, wherein the binder is added in an amount of 0.5% to 5% of the total mass of the molybdenum concentrate and the pyrite in step S1.
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| FR2342349A2 (en) * | 1976-02-27 | 1977-09-23 | Amax Inc | PROCESS FOR THERMAL DISSOCIATION OF MOLYBDENE BISULPHIDE TO PREPARE FERROMOLYBDENE AND NEW PRODUCTS THUS OBTAINED |
| CN101343696A (en) * | 2008-08-15 | 2009-01-14 | 昆明理工大学 | Desulfurization method for molybdenum sulfide |
| CN102643996A (en) * | 2012-05-23 | 2012-08-22 | 云南驰宏锌锗股份有限公司 | Method for producing lead bullion by means of copper dross side-blown smelting |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2342349A2 (en) * | 1976-02-27 | 1977-09-23 | Amax Inc | PROCESS FOR THERMAL DISSOCIATION OF MOLYBDENE BISULPHIDE TO PREPARE FERROMOLYBDENE AND NEW PRODUCTS THUS OBTAINED |
| CN101343696A (en) * | 2008-08-15 | 2009-01-14 | 昆明理工大学 | Desulfurization method for molybdenum sulfide |
| CN102643996A (en) * | 2012-05-23 | 2012-08-22 | 云南驰宏锌锗股份有限公司 | Method for producing lead bullion by means of copper dross side-blown smelting |
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