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Method of separating and recovering zinc from electroplating sludge

A technology of separation and recovery of electroplating sludge, applied in the field of metallurgy, can solve the problems of low market price, economical discount, and large consumption of auxiliary materials for zinc products, and achieve the effects of high added value of products, less consumption of auxiliary materials, and low production costs

Inactive Publication Date: 2015-12-30
广西银亿再生资源有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Including acid leaching, sulfur separation and enrichment, hot-press leaching, extraction and separation, chromium hot-press oxidation, chromium solution purification, extraction of ferric chloride and other processes. This method has strong adaptability to different types of electroplating sludge and has high utilization rate of metal resources. High, less process waste residue, complete detoxification and other significant advantages, but this patented technology requires a vulcanizing agent for vulcanization separation and then undergoes steps such as stripping, iron washing, and concentration to separate zinc, iron, and copper. The extraction agent used for zinc extraction requires Saponification consumes a lot of auxiliary materials and the market price of zinc products is low. Using this method for electroplating sludge with high zinc content will greatly reduce the economic efficiency

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  • Method of separating and recovering zinc from electroplating sludge
  • Method of separating and recovering zinc from electroplating sludge
  • Method of separating and recovering zinc from electroplating sludge

Examples

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Embodiment 1

[0044] A method for separating and recovering zinc from electroplating sludge, comprising the following specific steps:

[0045] (1) Leaching treatment: the electroplating sludge is leached with inorganic acid, stop adding sulfuric acid when the pH in the electroplating sludge is 1.0, and then carry out solid-liquid separation to obtain leaching residue and leaching solution. The zinc ion content in the leaching solution is 8g / l, Ni ion content is 5g / l, Cu ion content is 5g / l;

[0046] (2) Neutralization and removal of iron and chromium: Adding mass concentration to the leaching solution in (1) is 8% sodium carbonate solution, adjusting the pH of the leaching solution to be 3.5, selectively precipitating iron and chromium, zinc remains in the solution, and then solid-liquid Separation to obtain leaching residue and leaching solution; the content of trivalent Fe ions in the leaching solution is 0.05g / l, and the content of chromium ions is 0.01g / l;

[0047] (3) Extraction: P20...

Embodiment 2

[0049] A method for separating and recovering zinc from electroplating sludge, comprising the following specific steps:

[0050] (1) Leaching treatment: the electroplating sludge is leached with inorganic acid, stop adding sulfuric acid when the pH in the electroplating sludge is 1.5, and then carry out solid-liquid separation to obtain leaching slag and leaching solution. The zinc ion content in the leaching solution is 15g / l, Ni ion content is 30g / l, Cu ion content is 30g / l;

[0051] (2) Neutralization and removal of iron and chromium: add a mass concentration of 9% sodium carbonate solution to the leaching solution in (1), adjust the pH of the leaching solution to be 4.5, selectively precipitate iron and chromium, zinc remains in the solution, and then solid-liquid Separation to obtain leaching residue and leaching solution; the content of trivalent Fe ions in the leaching solution is 0.02g / l, and the content of chromium ions is 0.008g / l;

[0052] (3) Extraction: P204 wit...

Embodiment 3

[0054] A method for separating and recovering zinc from electroplating sludge, comprising the following specific steps:

[0055] (1) Leaching treatment: leaching the electroplating sludge with inorganic acid, stop adding sulfuric acid when the pH in the electroplating sludge is 1.0, and then carry out solid-liquid separation to obtain leaching residue and leaching solution. The zinc ion content in the leaching solution is 8.5g / l, Ni ion content is 10g / l, Cu ion content is 8g / l;

[0056] (2) Neutralization and removal of iron and chromium: add mass concentration of 8% sodium bicarbonate to the leaching solution in (1), adjust the pH of the leaching solution to 4.0, selectively precipitate iron and chromium, zinc remains in the solution, and then solid-liquid Separation to obtain leaching residue and leaching solution; the content of trivalent Fe ions in the leaching solution is 0.01g / l, and the content of chromium ions is 0.007g / l;

[0057] (3) Extraction: P204 with a concent...

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Abstract

The invention belongs to the field of metallurgy and particularly relates to a method of separating and recovering zinc from electroplating sludge, comprising the steps of 1, performing leaching treatment: leaching the electroplating sludge with an organic acid, and carrying out solid-liquid separation to obtain leaching residue and leachate; 2, removing iron and chromium by neutralizing: adding a neutralizing agent into the leachate obtained in step 1, and carrying out solid-liquid separation to obtain ferric hydroxide precipitate, chromic hydroxide precipitate and leachate; 3, performing extracting: mixing P204, tributyl phosphate, an organic extracting agent N1923 and a solvent oil to obtain a mixed extracting agent, extracting the leachate generated in step 2, with the mixed extracting agent, and adding an organic acid to carry out re-extraction to obtain raffinate and zinc-containing re-extracted liquor, namely purified liquor containing zinc sulfate. The method has the advantages that the zinc may be extracted and separated from sulfuric acid leachate of the electroplating sludge so that the zinc is comprehensively recycled, an extracting process needs no caustic soda liquid for saponification, recycling cost is decreased, and economic benefit is increased.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a method for separating and recovering zinc from electroplating sludge. Background technique [0002] Electroplating sludge refers to heavy metal-containing sludge waste generated after wastewater treatment in the electroplating industry, and is included in the seventeenth category of hazardous waste in the national hazardous waste list. As the "final state" of electroplating wastewater, although its amount is much less than that of wastewater, since heavy metals such as copper, nickel, chromium, zinc, and iron are all transferred to the sludge, if they are not treated or disposed of improperly, it will cause More serious and long-term secondary pollution. If high-grade heavy metals such as nickel, copper, and zinc in electroplating sludge are not recycled, it also means a huge waste of resources. Many scientific research institutes, universities, enterprises and individuals have done...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B19/30C22B3/40
CPCY02P10/20
Inventor 谭笑天
Owner 广西银亿再生资源有限公司
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