Process for recovering valuable metals in bismuth-containing material by selective chloride volatilizing method

A technology for chlorinated volatilization and valuable metals, applied in the field of non-ferrous metallurgy, can solve the problems of long process flow and lack of universal applicability, and achieve the effects of short process flow, accelerated capital turnover and low requirements

Active Publication Date: 2009-11-04
郴州雄风环保科技有限公司
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Problems solved by technology

[0004] Most of the above-mentioned technical processes use acid leaching, replacement, neutralization and hydrolysis combined with pyrometallurgy to separate and purify various v

Method used

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  • Process for recovering valuable metals in bismuth-containing material by selective chloride volatilizing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The materials used in this embodiment are mainly industrial grade anhydrous calcium chloride, common salt, soda ash, bismuth powder and silver-zinc slag.

[0021] The multi-element test results of silver-zinc slag are shown in Table 1.

[0022] Table 1

[0023] the element

Bi

Zn

Fe

Pb

Te

Cl

Au g / t

Ag g / t

Content%

55.34

7.69

0.22

0.10

0.16

1.15

11.8

2778

[0024] In view of the properties and characteristics of the above-mentioned silver-zinc slag, this embodiment studies the effects of the type of chlorinating agent, roasting atmosphere, roasting temperature, and roasting time on the volatilization rate of valuable metals. Precipitating zinc with zinc and milk of lime is a relatively mature process, and the work in this example mainly focuses on the selective chlorination of volatile parts.

[0025] The main equipment used in this embodiment is shown in Table 2.

...

Embodiment 2

[0036] The batching ratio of the process step ② of the present embodiment is according to: bismuth-containing powder / calcium chloride / sodium chloride / water or return concentrated solution=100 / 3 / 8 / 7; the rest are the same as in embodiment 1.

Embodiment 3

[0038] The batching ratio of the process step ② of the present embodiment is according to: bismuth-containing powder / calcium chloride / sodium chloride / water or return concentrated solution=100 / 6 / 5 / 9; the rest are the same as in embodiment 1.

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Abstract

The invention relates to a process for recovering valuable metals in a bismuth-containing material by a selective chloride volatilizing method, and belongs to the technical field of colored metallurgy. The process comprises the following steps of: mixing bismuth-containing powder prepared from the bismuth-containing material, calcium chloride, sodium chloride and water in a ratio of 100:3-6:5-8:7-9, and pelletizing the mixture to obtain dry material balls; carrying out chlorination and volatilization roasting to the dry material balls in a chloridizing volatilization furnace at a temperature of between 600 and 900 DEG C, and desilvering a silver-rich chloride slag after roasting; condensing and absorbing chloride steam generated by the roasting by water or a thin hydrochloric acid solution to obtain a recovery solution; adding bismuth powder in the recovery solution to displace, and obtaining sponge gold powder by filtration; then introducing ammonia and water into a filtrate for hydrolysis to obtain a bismuth chloride oxide, and carrying out de-bismuth further process to the bismuth chloride oxide; adding Na2Co3 in a raffinate to precipitate tellurium to obtain tellurium dioxide; adding a lime cream in a later filtrate generated by the tellurium precipitation and filtration, and stirring and filtering the mixture to obtain basic zinc carbonate; and finally, evaporating and concentrating the filtrate into a concentrated solution to return for mixture pelletizing. The method has the advantages of low requirement on the processed bismuth-containing material, strong adaptability, low cost, simple operation, high recovery rate and the like.

Description

technical field [0001] The invention relates to the technical field of nonferrous metallurgy, in particular to a process for recovering valuable metals in bismuth-containing materials by selective chlorination and volatilization. Background technique [0002] Bismuth metal has a series of unique physical and chemical properties and enjoys the reputation of "green metal". It is widely used in medicine, fine chemical industry, semiconductor, superconductor, flame retardant, pigment, cosmetic, chemical reagent, electronic ceramics, fusible alloy, metallurgy Additives etc. With the continuous expansion of the application field of bismuth products, the annual consumption of bismuth in the world has also increased by 15% year by year, from more than 4,000 tons in the 1990s to more than 12,000 tons in 2007. But the world's bismuth resources are very scarce. my country's bismuth resources are mainly located in Chenzhou, Hunan, Lianzhou, Guangdong, and Ganzhou, Jiangxi. And there ...

Claims

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Application Information

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IPC IPC(8): C22B30/06C22B1/24C22B1/08C22B3/46C22B11/00C22B7/04C22B19/00C01B19/00
CPCY02P10/20
Inventor 谭雄玉曹远平谭光华李跃林曹孝义
Owner 郴州雄风环保科技有限公司
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