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A method for removing copper ions in copper sulfate waste liquid containing nitric acid

A technology of copper sulfate and copper ions, applied in chemical instruments and methods, water/sewage multi-stage treatment, multi-stage water treatment, etc., can solve the problems of copper-containing electrolyte reuse and recycling difficulties, and reduce secondary pollution Dangerous, efficiency-enhancing, and easy-to-operate effects

Active Publication Date: 2019-04-09
WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the present invention utilizes hydrosulfite and sodium thiosulfate to reduce the copper ions in the copper sulfate waste liquid containing nitric acid to copper simple substance, and solves the problem of difficult reuse and recovery of the existing copper-containing electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take known to contain Cu 2+ Concentration 102.1mg / L, NO 3 - Concentration is 20g / L electrolytic copper tail liquid 150ml, add 0.15gNa 2 S 2 o 3 , stirred and reacted for 20 minutes, then added 2g of hydrosulfite and 2ml of PAM solution with a mass fraction of 0.35%, stirred and reacted for 0.5h, then stood still for 1h, took a certain volume of clear liquid for dilution and other pretreatments, according to GB / T 8538 -2008 method for determination of Cu by AAS 2+ The concentration is 30.052mg / L, and the copper removal rate is 70.6%.

Embodiment 2

[0030] Take known to contain Cu 2+ Concentration 102.1mg / L, NO 3 - Concentration is 20g / L electrolytic copper tail liquid 150ml, add 0.15gNa 2 S 2 o 3 , stirred and reacted for 20 minutes, then added 2g of sodium hydrosulfite and 2ml of PAM solution with a mass fraction of 0.35%, stirred and reacted for 1 hour, then stood still for 1 hour, took a certain volume of clear liquid for dilution and other pretreatments, according to GB / T 8538- 2008 Method Determination of Cu by AAS 2+ The concentration is 15.052mg / L, and the copper removal rate is 85.3%.

Embodiment 3

[0032] Take known to contain Cu 2+ Concentration 102.1mg / L, NO 3 - Concentration is 20g / L electrolytic copper tail liquid 150ml, add 0.15gNa 2 S 2 o 3 , stirred and reacted for 20 minutes, then added 2g of sodium hydrosulfite and 2ml of PAM solution with a mass fraction of 0.35%, stirred and reacted for 2 hours, then stood still for 1 hour, took a certain volume of clear liquid for dilution and other pretreatments, according to GB / T 8538- 2008 Method Determination of Cu by AAS 2+ The concentration is 0.542mg / L, and the copper removal rate is 99.4%.

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PUM

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Abstract

The invention discloses a method for removing copper ions in a nitric acid-containing copper sulfate waster liquid; the method comprises the following steps: (1) firstly, adding sodium thiosulfate into the to-be-treated nitric acid-containing copper sulfate waster liquid, and stirring to dissolve sodium thiosulfate fully; (2) then, adding sodium hydrosulfite into the nitric acid-containing copper sulfate waster liquid treated in the step (1), and reducing the copper ions in the waste liquid into elemental copper; (3) then, adding a PAM solution into a filtrate obtained in the step (2); and (4) finally, allowing to stand, co-precipitating, filtering out the precipitate with a cloth bag filter, and removing copper in the tail liquid. The method utilizes sodium hydrosulfite and sodium thiosulfate for reducing the copper ions in the nitric acid-containing copper sulfate waster liquid into elemental copper, and solves the problems that a conventional copper-containing electrolyte is difficult to reuse and recycle.

Description

technical field [0001] The invention relates to the technical field of copper sulfate waste liquid treatment, in particular to a method for removing excessive copper ions in electrolytic tail liquid. Background technique [0002] Nitric acid is a kind of strong oxidizing and corrosive acid. Nitric acid is mainly produced by ammonia oxidation in industry, and is used to manufacture fertilizers, explosives, nitrates, etc.; nitric acid has oxidizing and corrosive properties regardless of concentrated or dilute solutions, so It is very dangerous to people; copper sulfate is an important raw material for preparing other copper-containing compounds. Its aqueous solution is weakly acidic and blue. It is also the electrolyte for electrolytic refining of copper. Copper sulfate is a heavy metal salt and is harmful to human health. [0003] There are many ways to remove heavy metals in waste liquid, for example: ion exchange resins and ion exchange membranes can be used to remove metal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/20
CPCC02F1/001C02F1/56C02F1/70C02F9/00C02F2101/20C02F2301/08
Inventor 陈禾峰袁述孙志洋
Owner WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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