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Method for recovering silver from lead-separating liquid of silver-separating residue of copper anode slime

A technology for copper anode slime and silver separation slag is applied in the direction of improving process efficiency, which can solve problems such as short processing process flow and achieve the effect of simple and easy process.

Active Publication Date: 2011-11-16
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is mainly to solve the problem of silver recovery in the lead liquid, not only can ensure the effective recovery of silver valuable metals, but also has a short process flow, simple equipment, and no secondary pollution

Method used

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  • Method for recovering silver from lead-separating liquid of silver-separating residue of copper anode slime
  • Method for recovering silver from lead-separating liquid of silver-separating residue of copper anode slime
  • Method for recovering silver from lead-separating liquid of silver-separating residue of copper anode slime

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Put 1L of lead liquid (silver content 2.1g / L) into the stirring tank, add sodium hydroxide for neutralization, adjust the pH of the lead liquid to 6, lead will precipitate in the form of lead hydroxide, filter to obtain lead Feed and the first filtrate, the lead-containing material is washed and returned to the lead separation process for lead separation; the first filtrate is added with sodium sulfate, until the solution does not produce precipitation, stop adding sodium sulfate, filter, obtain the filter residue and the second filtrate, and concentrate the filter residue; Sodium oxide adjusted the pH of the second filtrate to 12, added 0.7g of formaldehyde, stirred for 10 minutes, filtered to obtain silver powder and the third filtrate, added hydrochloric acid to the third filtrate to adjust the pH to 0.5, and returned to the lead separation process. The silver recovery rate is 98.5%.

Embodiment 2

[0017] Put 1L of lead liquid (silver content 1.8g / L) into the stirring tank, add sodium hydroxide for neutralization, adjust the pH of the lead liquid to 7.5, lead will precipitate in the form of lead hydroxide, filter to obtain lead Feed and the first filtrate, the lead-containing material is washed and returned to the lead separation process for lead separation; the first filtrate is added with sodium sulfate, until the solution does not produce precipitation, stop adding sodium sulfate, filter, obtain the filter residue and the second filtrate, and concentrate the filter residue; Sodium oxide adjusted the pH of the second filtrate to 11.5, added 0.9g of formaldehyde, stirred for 15 minutes, filtered to obtain silver powder and the third filtrate, added hydrochloric acid to the third filtrate to adjust the pH to 0.8, and returned to the lead separation process. The silver recovery rate is 99.1%.

Embodiment 3

[0019] Put 1L of lead liquid (silver content 1.5g / L) into the stirring tank, add sodium hydroxide for neutralization, adjust the pH of the lead liquid to 8, lead will precipitate in the form of lead hydroxide, filter to obtain lead Feed and the first filtrate, the lead-containing material is washed and returned to the lead separation process for lead separation; the first filtrate is added with sodium sulfate, until the solution does not produce precipitation, stop adding sodium sulfate, filter, obtain the filter residue and the second filtrate, and concentrate the filter residue; Sodium oxide adjusted the pH of the second filtrate to 13, added 1.2g of formaldehyde, stirred for 30 minutes, filtered to obtain silver powder and the third filtrate, added hydrochloric acid to the third filtrate to adjust the pH to 0.2, and returned to the lead separation process. The silver recovery rate is 98.6%.

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Abstract

The invention discloses a method for recovering silver from the lead-separating liquid of the silver-separating residue of copper anode slime, which relates to a method for greenly recovering silver in the lead-separating liquid by adopting a step-by-step precipitation method. The method includes lead-separating process, and also includes the processes that: the lead-separating liquid is poured into a stirring tank, sodium hydroxide is added for neutralization, so that the pH of the lead-separating liquid is regulated to 6 to 8, lead is precipitated in the form of lead hydroxide, lead-containing material and first filtrate are obtained by filtration, and the lead-containing material is washed by water and returns to the lead-separating process to separate lead; sodium sulfate is added in the first filtrate until the solution does not produce precipitate, filter residue and second filtrate are obtained by filtration, and the filter residue is centrally treated; sodium hydroxide is utilized to regulate the pH of the second filtrate to no less than 11, a moderate amount of formaldehyde is added, stirring is carried out for 10 to 30 minutes, silver powder and third filtrate are obtained by filtration, hydrochloric acid is added into the third filtrate to regulate the pH to less than 1, and the third filtrate retunes to the lead-separating process. The method is characterized in that: the technique is simple and easy, the used materials and equipment are common and cheap, the final filtrate is recycled, and no pollution is generated.

Description

technical field [0001] The invention belongs to the recycling process of separating silver from silver slag and separating lead liquid, and in particular relates to recycling silver in copper anode slime and separating silver from lead liquid. Background technique [0002] Copper anode slime silver slag is the residue after extracting precious metals such as gold, silver, platinum, palladium and copper, selenium, tellurium and other valuable elements from copper anode slime. Copper anode slime is composed of elements more positive than copper potential and various substances insoluble in electrolyte during the electrolytic refining process. Its composition mainly depends on the composition of copper anode, casting quality and electrolysis technical conditions, and its yield is generally 0.2-0.8%; it usually contains Au, Ag, Cu, Pb, Se, Te, As, Sb, Bi, Ni, Fe, S, Sn, SiO 2 、Al 2 o 3 , platinum group metals and moisture. Anode slime derived from copper sulfide concentrate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B7/00C22B3/44
CPCY02P10/20
Inventor 潘德安张深根李彬田建军
Owner UNIV OF SCI & TECH BEIJING
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