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High lead bismuth silver alloy electrolysis deleading process

An electrolysis and alloy technology, applied in the direction of photography process, photography auxiliary process, process efficiency improvement, etc., can solve the problems of inappropriate recovery of precious metals, pollution, increase smelting cost, etc., and achieve fewer types, strong controllability, and absolute recovery. high rate effect

Active Publication Date: 2012-02-01
JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The previous treatment method of high-lead bismuth-silver alloy is generally chlorine chlorination method, which has strict requirements for high-lead bismuth-silver alloy, is not suitable for recycling precious metals, causes environmental pollution and other unfavorable factors, which greatly increases the cost of smelting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A high-lead bismuth-silver alloy electrolytic deleading process comprises the following steps:

[0040] Step 1: Pretreatment of high-lead bismuth-silver alloy

[0041] Put 1 ton of high-lead-bismuth-silver alloy into the anode pot, heat up and melt, and the temperature rises to about 500°C. After the alloy is completely melted, remove the unmelted residue.

[0042] The composition of the high-lead bismuth-silver alloy is represented by mass percentage as Pb: 71%, Bi: 28%, Ag: 1%;

[0043] Add sulfur to remove copper

[0044] Cool down to 280°C, start the mixer, the blade rod of the mixer stirs the thick bismuth melt, add sulfur while stirring, add sulfur powder to the center of the vortex of the rough bismuth melt being stirred; add excess sulfur powder to make the reaction complete .

[0045] The reaction formula is:

[0046] 2Bi+3S=Bi 2 S 3

[0047] Bi 2 S 3 +6Cu=2Bi +3Cu 2 S

[0048] Gradually raise the temperature to 500°C, stir for 20-30 minutes, sto...

Embodiment 2

[0068] Embodiment two : The similarities with Embodiment 1 will not be described in detail, and the only difference is that

[0069] In the first step of sulfur addition and copper removal process, add excess sulfur powder and cool down to 350°C before stirring; after adding sulfur powder, gradually increase the temperature to 550°C, continue stirring for 30 minutes, stop stirring, and remove the solid or slag; After slag, the temperature of the bismuth liquid is raised to 650°C, and air is blown into the rough bismuth liquid to make the residual sulfur in the bismuth liquid overflow.

[0070] In the second step, the liquid high-lead bismuth-silver alloy is pumped into the anode mold to cast the anode plate, the main element control range of the anode plate is expressed by mass fraction, Pb: 80%, Bi: 40%; the impurity elements of the anode plate The control range, represented by mass fraction, Cu: 0.42%, Sn: 0.013%, As: 1.4%, Sb: 1.85%.

[0071] In the third step of prepari...

Embodiment 3

[0076] Embodiment three: The similarities with Example 1 will not be described in detail, the only difference is that in the first step of sulfur addition and copper removal process, the temperature is lowered to 300°C before adding excess sulfur powder for stirring; after adding sulfur powder, the temperature is gradually raised to 530°C, Continue to stir for 250 minutes, stop stirring, and remove the solid or slag; after removing the slag, raise the temperature of the bismuth liquid to 610°C, and blow air into the crude bismuth liquid to make the residual sulfur in the bismuth liquid overflow.

[0077] In the second step, the liquid high-lead bismuth-silver alloy is pumped into the anode mold to cast the anode plate, the main element control range of the anode plate is expressed by mass fraction, Pb: 65%, Bi: 30%; the impurity elements of the anode plate The control range, represented by mass fraction, Cu: 0.42%, Sn: 0.013%, As: 1.4%, Sb: 1.85%.

[0078] In the third step ...

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Abstract

The invention relates to the metal refining field, in particular to a high lead bismuth silver alloy electrolysis deleading process. Pre-treatment is carried out on high lead bismuth silver alloy in an anode pot, then molten high lead bismuth silver alloy is pumped into an anode casting mould to be cast into an anode plate, electrolytic solution is confected, and electrolysis of the anode plate and a cathode plate is carried out in an electrolyzer, thus obtaining high grade separated lead anode mud which is easy to be treated. The invention can produce high grade separated lead and lead anodemud which is easy to be treated, product cost is reduced, process is simple, controllability is strong, safety is high, the process can be carried out under mild condition, intermediate products are less, and absolute recovery rate on metal is high.

Description

technical field [0001] The invention relates to the field of metal refining, in particular to a high-lead-bismuth-silver alloy electrolytic deleading process. Background technique [0002] The content of bismuth in the earth's crust is only 8×10 -9 Left and right, there are very few isolated primary natural bismuth ores, and most of them are symbiotic with ores of tungsten, lead, copper, iron and other metals. Therefore, bismuth is generally recovered as a by-product in the smelting process of lead, copper, and iron. The most common form of bismuth in the by-products is high-lead bismuth-silver alloy. The previous treatment method of high-lead bismuth-silver alloy is generally chlorine chlorination method, which has strict requirements for high-lead bismuth-silver alloy, is not suitable for recycling precious metals, causes environmental pollution and other unfavorable factors, which greatly increases the cost of smelting. The electrolytic method can process general high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/00
CPCY02P10/20
Inventor 赖庆冲李继红刘剑叶余欢荣柳国政谢勇
Owner JIANGXI RARE EARTH & RARE METALS TUNGSTEN GRP HLDG CO LTD