Method of removing arsenic for anode mud with high arsenic and lead content

The technology of lead anode slime and anode slime is applied in the field of precious metal metallurgy, which can solve the problems of large consumption of leachate, high heating temperature and high cost, and achieve the effects of low production cost, low temperature and convenient operation.

Inactive Publication Date: 2007-08-15
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process consumes a lot of leachate, high heating

Method used

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  • Method of removing arsenic for anode mud with high arsenic and lead content

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The production process adopted in this embodiment is shown in Figure 1. High-arsenic lead anode slime is added with lye, and is leached by alkali under the condition of continuously blowing air and heating; the lead anode slime after arsenic removal is used The well-known process comprehensively recovers gold, silver and other valuable metals; the leaching solution contains sodium arsenate, arsenic concentrate is recovered by lime arsenic precipitation, and the solution after arsenic precipitation is supplemented with lye and returned to the alkali leaching process.

[0027] The raw material used in this embodiment is lead anode slime placed for a certain period of time, and its chemical composition is shown in Table 1.

[0028] Table 1

[0029] Element

Ag

Cu

Pb

As

Sb

Bi

Content / %

5.87

1.74

24.69

7.14

36.55

17.62

[0030] A. Slightly pulverize the above-mentioned anode slime...

Embodiment 2

[0035] The production process adopted in this embodiment is the same as in Example 1.

[0036] The raw material used in this embodiment is anode slime that has been placed for a certain period of time, and its chemical composition is shown in Table 2.

[0037] Table 2

[0038] Element

Ag

Cu

Pb

As

Sb

Bi

Content / %

6.85

1.32

20.85

8.55

35.17

19.31

[0039] A. Slightly pulverize the anode slime with a particle size of -90 mesh;

[0040] B. The anode slime was stirred and leached with 2.2mol / L NaOH for 8 hours under the condition of solid / liquid ratio (kg / L)=1:4, temperature 69°C, and continuous air blowing;

[0041] C, alkaline immersion solution is cooled to room temperature, adjusts pH=14, adopts lime to deposit arsenic, reclaims arsenic concentrate;

[0042] D. Add NaOH to the leaching solution after arsenic removal until its concentration in the solution is 2.2mol / L, and circulat...

Embodiment 3

[0044] The production process adopted in this embodiment is the same as in Example 1.

[0045] The raw material used in this embodiment is anode slime placed for a certain period of time, and its chemical composition is shown in Table 3.

[0046] Table 31

[0047] Element

Ag

Cu

Pb

As

Sb

Bi

Content / %

3.95

3.81

27.61

5.13

34.25

16.82

[0048] A. Slightly pulverize the anode slime with a particle size of -85 mesh;

[0049] B. Anode slime was stirred and leached with 2.1mol / L NaOH for 6 hours under the condition of solid / liquid ratio (kg / L)=1:6, temperature 50°C, and continuous air blowing;

[0050] C, alkaline immersion solution is cooled to room temperature, adjusts pH=14, adopts lime to deposit arsenic, reclaims arsenic concentrate;

[0051] D. Add NaOH to the leaching solution after arsenic removal until its concentration in the solution is 2.1mol / L, and circulate back to leachin...

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Abstract

The invention discloses a method to remove arsenic with high arsenic lead anode mud in noble metal metallurgical technical domain, which comprises the following steps: adding alkali liquor into high arsenic lead anode mud; leaching with alkali under the condition of air-blowing and heating; removing the arsenic; getting lead anode mud; reclaiming god and silver and other valuable metal with known craft; incorporating sodium arsenate in the leachate; depositing arsenic with lime; reclaiming arsenic clean ore; supplementing alkali liquor for the solution after depositing arsenic; backing to alkaline leaching process. This invention can make arsenic of anode mud decrease to below 1% and does not need any alteration for original craft.

Description

technical field [0001] The invention relates to a method for removing arsenic from high-arsenic lead anode slime, and belongs to the technical field of precious metal metallurgy. Background technique [0002] Lead anode slime is an important raw material for non-ferrous metals and precious metals. Due to the extensive use of high-arsenic lead ores, the content of arsenic in lead anode slime is getting higher and higher. Using the traditional pyrotechnic process to process lead anode slime for comprehensive recovery of gold, silver and other valuable metals will produce a large amount of high-arsenic and antimony soot during the reduction smelting process, which increases the difficulty of comprehensive recovery of gold, silver and other valuable metals, and causes environmental damage. of great danger. In order to reduce environmental pollution, the method of pre-removing arsenic is widely used. The arsenic-removal pretreatment of high-arsenic lead slime has been studied a...

Claims

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Application Information

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IPC IPC(8): C22B3/12C22B30/04
CPCY02P10/20
Inventor 蔡练兵杨跃新
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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