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Process for treating chemical nickel-plating discarded liquid

A technology of electroless nickel plating and treatment process, applied in the direction of oxidized water/sewage treatment, improvement of process efficiency, chemical instruments and methods, etc., can solve the problems of high treatment cost, small saturated adsorption capacity, complicated process operation, etc., and achieve reduction The effect of nickel content, reduction of phosphorus discharge, and simple operation process

Active Publication Date: 2012-02-15
江门市瑞期精细化学工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage is that the processing capacity is small, the selection of ion exchange resin is difficult, and the process operation is complicated; the solvent extraction method needs more extraction stages to treat the electroless nickel plating waste liquid, and the consumption of organic solvent in the extraction and regeneration process is large, and the treatment cost High; the adsorption materials used in the adsorption method include activated carbon, humic acid, sepiolite, adsorption resin, etc., which are often used to treat low-concentration Ni2+ wastewater, and the saturated adsorption capacity Smaller, easy to cause secondary pollution, and large investment in equipment; membrane separation technologies include reverse osmosis, membrane extraction, electrodialysis, etc. promotional use

Method used

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  • Process for treating chemical nickel-plating discarded liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preferred solution of the electroless nickel plating waste liquid treatment process of the present invention comprises the following steps:

[0043] 1) Collect the waste solution of electroless nickel plating to the PP tank, and put it into the iron plate to replace and recover nickel;

[0044] 2) Import the waste liquid obtained in the previous step into the acidification tank for acidification, and add sulfuric acid to adjust the pH to 1.5 to 2.0;

[0045] 3) Add 10% sodium hypochlorite solution to the pool, the volume ratio of sodium hypochlorite solution to waste liquid is 5:1;

[0046] 4) Import the waste liquid obtained in the previous step into the calcification tank, add milk of lime, and adjust to pH=7;

[0047] 5) Pump the waste liquid and sediment obtained in the previous step to the filter press for filtration;

[0048] 6) Discharge the filter press effluent obtained in the previous step to the comprehensive pool of the wastewater station for subsequent ...

Embodiment 2

[0050] A preferred solution of the electroless nickel plating waste liquid treatment process of the present invention comprises the following steps:

[0051] 1) Collect the waste solution of electroless nickel plating to the PP tank, and put it into the iron plate to replace and recover nickel;

[0052] 2) Import the waste liquid obtained in the previous step into the acidification tank for acidification, and add hydrochloric acid to adjust the pH to 1.5 to 2.0;

[0053] 3) Add 37% hydrogen peroxide solution into the pool, the volume ratio of hydrogen peroxide solution to waste liquid is 1.5:1;

[0054] 4) Import the waste liquid obtained in the previous step into the calcification tank, add milk of lime, and adjust to pH=7;

[0055] 5) Pump the waste liquid and sediment obtained in the previous step to the filter press for filtration;

[0056] 6) Discharge the filter press effluent obtained in the previous step to the comprehensive pool of the wastewater station for subsequ...

Embodiment 3

[0058] A preferred solution of the electroless nickel plating waste liquid treatment process of the present invention comprises the following steps:

[0059]1) Collect the waste solution of electroless nickel plating to the PP tank, and put it into the iron plate to replace and recover nickel;

[0060] 2) import the waste liquid obtained in the previous step into the acidification tank for acidification, and add hydrochloric acid to adjust the pH to be 3;

[0061] 3) Add 10% sodium hypochlorite solution to the pool, the volume ratio of sodium hypochlorite solution to waste liquid is 8:1;

[0062] 4) Import the waste liquid obtained in the previous step into the calcification tank, add milk of lime, and adjust to pH=7;

[0063] 5) Pump the waste liquid and sediment obtained in the previous step to the filter press for filtration;

[0064] 6) Discharge the filter press effluent obtained in the previous step to the comprehensive pool of the wastewater station for subsequent coa...

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Abstract

The invention discloses a process for treating chemical nickel-plating discarded liquid. The process has low requirements on equipment and a simple operation process; the chemical nickel-plating discarded liquid is divided into washing water and working discarded liquid which are treated separately, so that treatment difficulties are reduced; nickel is effectively recycled by a metal replacement principle; the process has a good economic benefit; the content of the nickel and phosphorus in discharged water can be effectively reduced; and the process meets national strict requirements on sewage discharge and has a remarkable effect.

Description

technical field [0001] The invention relates to the field of industrial waste water treatment, in particular to a process for treating waste liquid from electroless nickel plating. Background technique [0002] Electroless nickel plating is a kind of electroless nickel plating, directly under the action of strong reducing agent hypophosphite (sometimes also hydrazine and its derivatives, sodium borohydride, etc.) 2 + A surface treatment technology that forms a Ni-P alloy coating on the surface of a catalytically active coating. Because of its simple process, strong practicability, uniform coating, and the advantages of wear resistance, corrosion resistance, and no size and shape restrictions on plated parts, it is widely used in the fields of electronics, petrochemicals, machinery manufacturing, and aerospace. However, the electroless nickel plating solution is unstable and has a short service life due to its own reduction reaction properties. The generated working waste ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C22B7/00C22B23/00C02F1/72C02F1/76
CPCY02P10/20
Inventor 郭常文洪条民
Owner 江门市瑞期精细化学工程有限公司
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