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Method for recovering copper, nickel and chromium in electroplating sludge

A technology of electroplating sludge and recovery method, which is applied to the recovery of chromium, nickel and copper, can solve the problems of low recovery rate, high energy consumption, and cannot be reused, and achieves the effect of high recovery rate and good selectivity.

Inactive Publication Date: 2018-10-23
GUANGZHOU XINGUANGHE ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Harmless treatment generally adopts solidification-stabilization technology, which mixes electroplating sludge with curing agent, solidifies and seals harmful substances in the solidified body to eliminate pollution, or adds stabilizer to chemically react with sludge to produce harmless Substances are solidified and stabilized before being landfilled. Landfilling needs to occupy a large amount of land resources, and after solidification, the capacity will increase, and the transportation cost will increase; the useful metals in the sludge will not be reused, resulting in waste of resources.
[0005] Fire technology includes high-temperature melting method, roasting method and incineration method. The calorific value of electroplating sludge is low. The fire method generally requires the use of fuel, which consumes more energy and is likely to cause secondary pollution during the incineration process.
Wet technology is relatively low in cost and less secondary pollution, but the current wet technology has poor selectivity to copper, nickel and chromium, resulting in low recovery rate

Method used

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  • Method for recovering copper, nickel and chromium in electroplating sludge

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Comparison scheme
Effect test

Embodiment 1

[0062] The recovery steps of copper, nickel and chromium in the electroplating sludge of the present embodiment are as follows:

[0063] 1) Under normal temperature conditions, add sulfuric acid with a concentration of 5% by mass to the electroplating sludge with a water content of 80% to make the pH of the electroplating sludge 1.0, perform secondary countercurrent leaching for 3 hours, and press filter , to obtain leachate and filter residue, wherein the mesh number of the filter screen is 60 mesh; then the filter residue is repeatedly washed 3 times with tap water, and press-filtered 4 times for harmless treatment.

[0064] 2) Under the conditions of normal temperature and 0.01MPa, add ammonia water with a mass percentage concentration of 25% to the leachate to make it alkaline, react for 3.5 hours, and filter to obtain chromium hydroxide precipitate and reaction solution, wherein the mesh size of the filter screen is It is 150 mesh.

[0065] 3) Under the conditions of 0.0...

Embodiment 2

[0071] The recovery steps of copper, nickel and chromium in the electroplating sludge of the present embodiment are as follows:

[0072] 1) Under normal temperature conditions, add sulfuric acid with a concentration of 15% by mass to the electroplating sludge with a water content of 80% to make the pH of the electroplating sludge 1.0, perform secondary countercurrent leaching for 4 hours, and press filter , to obtain leachate and filter residue, wherein the mesh number of the filter screen is 60 mesh; then the filter residue is repeatedly washed 3 times with tap water, and press-filtered 4 times for harmless treatment.

[0073] 2) Under the conditions of normal temperature and 0.03MPa, add ammonia water with a mass percentage concentration of 25% to the leachate to make it alkaline, react for 3.5 hours, and filter to obtain chromium hydroxide precipitate and reaction solution, wherein the mesh size of the filter screen is It is 160 mesh.

[0074] 3) Under the conditions of 0....

Embodiment 3

[0080] The recovery steps of copper, nickel and chromium in the electroplating sludge of the present embodiment are as follows:

[0081] 1) Under normal temperature conditions, add sulfuric acid with a mass percentage concentration of 15% to the electroplating sludge with a water content of 80% to make the pH value of the electroplating sludge 1.0, carry out secondary countercurrent leaching for 3.5 hours, press Filter to obtain leachate and filter residue, wherein the mesh number of the filter screen is 50 mesh; then the filter residue is repeatedly washed 3 times with tap water, and press-filtered 4 times for harmless treatment.

[0082] 2) Under the conditions of normal temperature and 0.03MPa, add ammonia water with a mass percentage concentration of 25% to the leachate to make it alkaline, react for 3.5 hours, and filter to obtain chromium hydroxide precipitate and reaction solution, wherein the mesh size of the filter screen is It is 160 mesh.

[0083] 3) Under the cond...

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Abstract

The invention relates to a method for recovering copper, nickel and chromium in electroplating sludge. The method for recovering the copper, the nickel and the chromium in the electroplating sludge comprises the steps that the electroplating sludge is subjected to acid leaching treatment through sulfuric acid, and a leaching solution is taken; ammonia water is added into the leaching solution until no sediment is generated, and a precipitate containing chromium element and a reaction liquid are obtained; ammonium ions in the reaction liquid are removed, and thus a treating liquid is obtained;copper ions in the treating liquid are extracted, and an extraction phase containing the copper ions and an aqueous phase solution are obtained; the extraction phase containing the copper ions is extracted back through the sulfuric acid and crystallized, and thus a copper sulphate crystal is obtained; and the aqueous phase solution is crystallized, and thus a nickel sulfate crystal is obtained. According to the method for recovering the copper, the nickel and the chromium in the electroplating sludge, the selectivity to the copper, the nickel and the chromium is good, and the recovery rate ishigh.

Description

technical field [0001] The invention relates to the technical field of metallurgy and chemical industry, in particular to a method for recovering copper, nickel and chromium in electroplating sludge. Background technique [0002] Electroplating sludge is a solid waste that has been neutralized from wastewater in the electronics, electroplating, and circuit board surface treatment industries, and has been listed as hazardous waste by the state. Electroplating sludge has a high moisture content; the particles are fine and muddy; the composition is complex and contains a variety of heavy metal elements such as copper, zinc, nickel, chromium, etc.; metals are mostly endowed in the form of hydroxides, oxides and carbonates. Therefore, the comprehensive utilization of electroplating sludge brings considerable difficulty. [0003] There are mainly two treatment methods for electroplating sludge. One is harmless treatment and disposal. After the sludge is solidified, the sludge wil...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00C22B23/00C22B34/32
CPCC22B7/007C22B15/0071C22B15/0089C22B23/043C22B34/32Y02P10/20
Inventor 赵广西赵广健邓发利杨昌良
Owner GUANGZHOU XINGUANGHE ENVIRONMENTAL PROTECTION TECH
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