Method for directly producing metal bismuth by performing reduction and sulfur-fixed roasting on bismuth sulfide material

A technology of bismuth sulfide and roasting products, which is applied in the field of non-ferrous metal metallurgy, can solve the problems of inability to use valuable metals at the same time, pollute the environment by flue gas, and consume large reagents, and achieve stable properties, simple operation and control, and non-toxic properties. Effect

Active Publication Date: 2017-03-15
合肥龙之韵医药技术有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved in the present invention is to produce a large amount of low-concentration SO in the current bismuth smelting process. 2 To solve the problems of flue gas pollution, high energy consumption, large consumption of reagents, and the inability to simultaneously utilize iron resources in slag and recover valuable metals, a method for directly producing metal bismuth by reducing bismuth sulfide materials and roasting for sulfur fixation is provided.

Method used

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  • Method for directly producing metal bismuth by performing reduction and sulfur-fixed roasting on bismuth sulfide material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Process flow chart of the present invention is attached figure 1 shown.

[0047] The main chemical components (wt.%) of the bismuth sulfide material used as the test raw material in this example are: Bi 25.18, Fe19.33, S 21.25, Al 1.46, Ca 3.30, Cu 1.99, Mo 2.23, Pb 2.78, SiO 2 12.67; the chemical composition of pyrite slag is (wt.%): Fe 71.30, S 1.72, Zn 1.28, SiO 2 10.57, CaO 2.14, Ag 850g / t; the chemical composition (wt.%) of iron oxide concentrate is: Fe 2 o 3 89.30, SiO 2 4.42, CaO 1.14, Al 2 o 3 1.81, MgO 0.29; the chemical composition (wt. %) of reduced coal powder is: C 82.33, S 2.01, SiO 2 6.66, CaO 0.83, Al 2 o 3 4.81, MgO 0.23; the chemical composition (wt. %) of the reduced coke powder is C 85.73, S 2.23, and ash 11.03.

[0048] S1. Weigh 100g of bismuth sulfide material, 32g of pyrite slag, and 10g of coal powder with the above ingredients, mix them evenly, put them into a graphite crucible, put them into an electric furnace and roast at 700...

Embodiment 2

[0053] Test raw materials, reagents and steps are the same as in Example 1.

[0054] Weigh 100g of bismuth sulfide material (concentrate), 32g of pyrite slag, and 10g of coal powder with the above ingredients, mix them uniformly, put them into a graphite crucible, put them into an electric furnace and roast at 750°C for 2.0h. After cooling, 127.42 g of roasted products were obtained, the main components being Bi 18.29%, Fe 31.02%, and S 13.97%. XRD and phase analysis show that metal bismuth accounts for 93.11% of the total bismuth in the bismuth phase, the iron phase is mainly FeS, and the calculated sulfur fixation rate is 85.74%. After adding 3g of KCl to the roasted product, the temperature was raised rapidly to 1000°C and held for 0.5h. After cooling, the metal and solid slag were separated to obtain 25.26g of crude metal bismuth, which contained 96.22% of bismuth after analysis, and the direct yield of bismuth was calculated to be 96.51%.

[0055] After adding 3g of coal...

Embodiment 3

[0058] Test raw materials, reagents and steps are the same as in Example 1.

[0059] Weigh 100g of bismuth sulfide material (concentrate), 32g of iron oxide concentrate, and 10g of coke powder with the above ingredients, mix them uniformly, put them into a graphite crucible, and put them into an electric furnace for 2.0 hours at 400°C. After cooling, 127.42 g of roasted products were obtained, the main components of which were Bi 18.75%, Fe 30.66%, and S 14.39%. The phase analysis shows that metal bismuth accounts for 55.82% of the total bismuth in the bismuth phase, the sulfur phase is mainly FeS, and the calculated sulfur fixation rate is 82.43%. After adding 3g NaCl to the roasted product, the temperature was raised rapidly to 800°C and held for 2 hours. After cooling, the metal and solid slag were separated to obtain 22.35g of crude metal bismuth, which contained 93.37% of bismuth after analysis, and the direct yield of bismuth was calculated to be 82.86%.

[0060] After ...

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Abstract

The invention discloses a method for directly producing metal bismuth by performing reduction and sulfur-fixed roasting on a bismuth sulfide material. The method comprises the following steps: performing scientific reduction and sulfur-fixed roasting on the bismuth sulfide material to produce the metal bismuth by one step; then performing simple and feasible liquation separation to obtain the metal bismuth; melting to separate ferrous sulfide to complete processes of transformation of bismuth from bismuth sulfide to the metal bismuth, sulfur fixing with ferric oxide, valued metal enrichment and the like. The method can continuously treat bismuth sulfide concentrate in a large scale and separate the metal bismuth and the ferrous sulfide; the direct recovery rate of the metal bismuth is up to 98.66 percent, and the separation rate of the ferrous sulfide is up to 95 percent or above. The method has the characteristics of simplicity in operation, cleanness and comprehensive utilization; efficient use of iron resources in cinders is realized, and valued metals are recycled; industrial production is easy to develop.

Description

technical field [0001] The invention relates to the technical field of metallurgy of non-ferrous metals, and more specifically relates to a method for extracting bismuth metal by reducing sulfur-fixing roasting of bismuth sulfide materials. Background technique [0002] Bismuth is a small metal but widely used in industrial fields such as biopharmaceuticals, coatings, electronics and glass. my country has a lot of bismuth resources, among which Shizhuyuan in Hunan is the world's bismuth capital, but because the production scale is much smaller than that of lead, zinc and copper, its smelting and extraction methods are also more backward than those of bulk metals, and the main process is still reverberatory furnace precipitation For smelting, the main problem is the generation of low concentrations of SO 2 Flue gas, iron powder and alkali consume a lot. [0003] In order to change this situation, since the 1960s, people have been carrying out new technology and basic theoret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B30/06C22B1/02C22B5/10
CPCC22B1/02C22B5/10C22B30/06Y02P10/20
Inventor 叶龙刚胡宇杰夏志美陈艺锋文平
Owner 合肥龙之韵医药技术有限公司
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