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Technology for extracting zinc, lead and silver step by step by processing zinc-leached residues by full wet process

A technology of zinc leaching slag and full wet method, which is applied in the field of zinc leaching slag recovery, can solve the problems of unfavorable recovery of other metals, high content of iron and silicon dioxide, secondary pollution, etc., and achieve low cost, high extraction rate, and reaction The effect of mild and relaxed conditions

Active Publication Date: 2014-12-17
JIANGXI LONGTIANYONG NONFERROUS METAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the volume of the solution in the slag treatment section is large and the content of iron and silicon dioxide in the solution is high, which is not conducive to the recovery of other metals. The waste slag contains sulfuric acid and heavy metal ions. It is necessary to build a large-capacity leak-proof slag storage, which is likely to cause secondary Pollution

Method used

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  • Technology for extracting zinc, lead and silver step by step by processing zinc-leached residues by full wet process
  • Technology for extracting zinc, lead and silver step by step by processing zinc-leached residues by full wet process
  • Technology for extracting zinc, lead and silver step by step by processing zinc-leached residues by full wet process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Add 750g of zinc leaching slag into the normal pressure reactor, in which the zinc content is 9.36wt.%, the lead content is 4.75wt.%, and the silver content is 239g / t. 2800g of 15wt.% sulfuric acid solution, heated to 90°C, reacted for 4 hours, the stirring rate was 400rpm, the obtained slurry was easy to separate, and the separated filter cake was weighed as 465g, containing 20wt of water .%, put it into a normal pressure reactor, add 1488g of 30wt.% sulfuric acid, heat up to 80°C, react for 3 hours, the stirring speed is 400rpm, the slurry obtained is easy to filter and separate, and the filter cake (lead-silver slag ) was washed 2 times; it weighed 297.6 g. One-stage leaching filtrate 3095ml, add 30%H to it 2 o 269ml was oxidized for 0.5h, and 178.34g of quicklime was added to remove iron for 2.5h, and 615g of iron slag was obtained by filtration, 2727ml of filtrate, and 130.46g of sodium sulfide was added to the filtrate to obtain 42.99g of zinc sulfide concentrat...

Embodiment 2

[0045] Add 500g of zinc leaching slag into the normal pressure reactor, in which the zinc content is 5.94wt.%, the lead content is 5.91wt.%, and the silver content is 196g / t. 2000g of 15wt.% sulfuric acid solution, heated to 90°C, reacted for 4 hours, the stirring rate was 400rpm, the obtained slurry was easy to separate, and the separated filter cake did not need to be washed and dried, and it was weighed as 367g, which contained 18wt of water .%, put it into a normal pressure reactor, add 1200g of 20wt.% sulfuric acid, heat up to 80°C, react for 3 hours, and the stirring speed is 400rpm. The obtained slurry is easy to filter and separate, and the separated filter cake (lead-silver residue ) was washed 2 times; it was weighed to 241 g. Add 30% H to the filtrate 2 o 2 38.17ml was oxidized for 0.5h, and 98.57g of quicklime was added to remove iron for 2.5h, and 135.84g of iron slag was obtained by filtration. After removing iron, the filtrate was 2002.1ml, and the filtrate w...

Embodiment 3

[0047] Add 500g of zinc leaching slag into the normal pressure reactor, in which the zinc content is 5.94wt.%, the lead content is 5.91wt.%, and the silver content is 196g / t. 1500g of 15wt.% sulfuric acid solution, heated to 90°C, reacted for 3 hours, the stirring rate was 400rpm, the obtained slurry was easy to separate, and the separated filter cake did not need to be washed and dried. It was weighed as 352g, which contained 19wt of water .%, put it into a normal pressure reactor, add 1200g of 15wt.% sulfuric acid, heat up to 80°C, react for 3 hours, the stirring speed is 400rpm, the slurry obtained is easy to filter and separate, and the filter cake (lead-silver slag ) washed 2 times; it weighed 232g. Add 30% H to the filtrate 2 o 2 38.17ml was oxidized for 0.5h, and 98.57g of quicklime was added to remove iron for 2.5h, and 133g of iron slag was obtained by filtration. After iron removal, 2010.13ml of filtrate was added, and 130.46g of sodium sulfide was added to the fi...

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Abstract

The invention relates to a technology for extracting zinc, lead and silver step by step by processing zinc-leached residues by a full wet process, and belongs to the technical field of zinc-leached residue recycle. The technology comprises the following steps of: preparing sulfuric acid into an appropriate concentration, and performing two-stage acid leaching in an appropriate liquid-solid ratio and at a high temperature to obtain slurry; filtering and separating the slurry to obtain lead-silver residues and a zinc-containing solution; oxidizing, neutralizing and deironing the zinc-containing solution, and depositing zinc by using sodium sulphide; and eluting the lead-silver residues, blending with caustic lye at an appropriate concentration to obtain slurry at a certain concentration, reacting at a certain temperature and in a certain solid-liquid ratio, and filtering and separating to obtain a filter cake and a filtrate, wherein the filtrate is directly added with sodium sulphide for lead deposition and the filter cake returns to a silver cyaniding leaching process. The technology is short in process, simple in operation, low in cost and mild and loose in reaction conditions; an acid solution and an alkali solution at high concentrations are not required; requirements on equipment are low; the extraction rate of metal is higher than that in the conventional method; no additional waste solid, waste liquid and waste gas are discharged; the recycle of the eluate and the filtrate is realized; and environment pollution is avoided from the source.

Description

technical field [0001] The invention relates to a process for step-by-step extraction of zinc, lead and silver from zinc leaching slag by all-wet treatment, and belongs to the technical field of zinc leaching slag recovery. Background technique [0002] At present, most of the wet zinc smelting plants adopt a continuous releaching process, usually two stages of leaching. After the above two leaching processes, the obtained leaching slag still contains high zinc content. In addition, it also contains silver and lead, etc. higher. Its main features are fine mineral particle size, serious muddy phenomenon, complex mineral composition, and a certain amount of heavy metal ions. Due to the lack of appropriate treatment techniques, the stockpiling of a large amount of slag not only occupies arable land, but also contains a large amount of heavy metal elements, which seriously pollutes the environment. At present, the price of non-ferrous metals is rising, and mineral resources ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B3/08C22B7/04C22B13/00C22B19/30C22B3/44
CPCY02P10/20
Inventor 张亚莉于先进董云会李德刚张丽鹏
Owner JIANGXI LONGTIANYONG NONFERROUS METAL CO LTD
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