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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  • Application Information

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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 sludg

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

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Example Embodiment

[0061] Example 1

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

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

[0064] 2) Under the conditions of normal temperature and 0.01MPa, add 25% by mass ammonia water to the leaching solution to make it alkaline, react for 3.5h, and filter to obtain chromium hydroxide precipitation and reaction solution. Among them, the mesh of the filter For 150 mesh.

[0065] 3) Under the conditions of 0.01MPa and 95°C, the reaction solution is reacted with ...

Example Embodiment

[0070] Example 2

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

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

[0073] 2) Under the conditions of normal temperature and 0.03MPa, add 25% by mass ammonia water to the leaching solution to make it alkaline, react for 3.5h, and filter to obtain chromium hydroxide precipitation and reaction solution. Among them, the mesh of the filter For 160 mesh.

[0074] 3) Under the conditions of 0.03MPa and 95°C, the reaction solution is reacted with calci...

Example Embodiment

[0079] Example 3

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

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

[0082] 2) Under the conditions of normal temperature and 0.03MPa, add 25% by mass ammonia water to the leaching solution to make it alkaline, react for 3.5h, and filter to obtain chromium hydroxide precipitation and reaction solution. Among them, the mesh of the filter For 160 mesh.

[0083] 3) Under the conditions of 0.03MPa and 100°C, the reaction solution is reacted with calcium oxide to o...

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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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