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A kind of nitric acid deplating wastewater recycling method for electroplating hangers

A technology for electroplating hangers and nitric acid, which is applied to electrolytic components, electrolytic processes, cells, etc., can solve the problems of secondary pollution, such as difficulty in meeting environmental protection standards, poor results, and complicated management, and achieves low operating costs, simple methods, and convenience. The effect of supplementation

Active Publication Date: 2019-05-03
卿江
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the resource treatment methods of nitric acid deplating wastewater from electroplating racks include acid-base neutralization precipitation method, electrolysis method, extraction method, membrane treatment method, ion exchange method, etc., all of which have high cost, high risk, complicated management, and poor effect. Secondary pollution is difficult to meet environmental protection standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take Cu 2+ The content is 139g / L, Ni 2+ The content is 8.9g / L, HNO 3 Content is 830 liters of nitric acid deplating waste water of high copper and low nickel class electroplating hanger of 225g / L, after filtering, cool to 1 ℃, add 194Kg of 98% industrial sulfuric acid under the stirring speed of 9 rev / mins and fully react, and reaction equation is Cu(NO 3 ) 2 +H 2 SO 4 =CuSO 4 +2HNO 3 , Ni(NO 3 ) 2 +H 2 SO 4 =NiSO 4 +2HNO 3 , keep the waste water temperature below 10°C when adding, and then cool to 1°C and maintain for several minutes after adding, so that copper sulfate is fully crystallized, and after solid-liquid separation, 354.8Kg crude copper sulfate pentahydrate and 702 liters of Cu 2+ The content is 35.78g / L, Ni 2+ The content is 8.9g / L, HNO 3 Content is the mixed solution of 641.1g / L, and the above-mentioned mixed solution is returned and transported to the nitric acid deplating tank of the electroplating rack, as nitric acid replenishment; the c...

Embodiment 2

[0034] Take Cu 2+ The content is 28g / L, Ni 2+ The content is 116.9g / L, HNO 3 Content is 500 liters of nitric acid deplating waste water of the high-nickel low-copper class electroplating hanger of 230g / L, cool to 1 ℃ after filtering, add 123Kg of 98% industrial sulfuric acid under the stirring speed of 100 rev / mins and fully react, and reaction equation is Cu(NO 3 ) 2 +H 2 SO 4 =CuSO 4 +2HNO 3 , Ni(NO 3 ) 2 +H 2 SO 4 =NiSO 4 +2HNO 3 , keep the temperature below 10°C when adding, and then cool to 1°C and maintain for several minutes after the addition is complete, so that nickel sulfate is fully crystallized, and then 155Kg crude nickel sulfate and 436 liters of Cu are obtained after solid-liquid separation. 2+ The content is 28g / L, Ni 2+ The content is 48.5g / L, HNO 3 Content is the mixed solution of 573g / L, and above-mentioned mixed solution is returned and transported in the nitric acid deplating tank of the electroplating hanger, when nitric acid is supplement...

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Abstract

The invention discloses a method for reusing nitric acid stripping wastewater of plating hangers and particularly relates to a method for reusing high-copper and low-nickel type, high-nickel and low-copper type and high-nickel and high-copper type nitric acid stripping wastewater of the plating hangers. According to the method for reusing the nitric acid stripping wastewater of the plating hangers, industrial sulfuric acid which is accurately calculated and added is subjected to a sufficient reaction with copper (II) nitrate and nickel (II) nitrate in the wastewater,the largest quantities of copper sulfate, nickel sulfate and nitric acid are prepared, prepared nitric acid is not mixed with sulfuric acid, and damage to the hangers is avoided completely. Besides, crystal water contained in copper sulfate and nickel sulfate crystals completely comes from the nitric acid stripping wastewater of the plating hangers, so that nitric acid stripping bathsolutions of the plating hangers can be reduced, and supplementation and addition are better facilitated. The method for reusing the nitric acid stripping wastewater of the plating hangers has the advantages of being simple, low in operation cost, small in investment and high in reusing value, three wastes are not produced in the whole treatment method, and the method is suitable for being popularized and applied in electroplating industry and environment protecting management units.

Description

technical field [0001] The invention relates to the technical field of wastewater reuse, in particular to a method for recycling wastewater from nitric acid deplating of electroplating racks. Background technique [0002] The electroplating hanger is a mounting and electrifying tool commonly used in the electroplating industry. The objects to be electroplated are mounted and energized through the rack for electroplating. The metal coating on the head of the rack needs to be deplated frequently. The method is concentrated nitric acid Chemical deplating and electrolytic deplating, because electrolytic deplating has not yet fully matured methods, it is difficult to control, often damages the hanger and the cost is high. At present, most electroplating companies mainly choose nitric acid deplating hanger. The principle is to use the solubility of concentrated nitric acid to most metals to dissolve and deplate the metal on the hanger head. During its use, it is necessary to add ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/46C25D21/18
CPCC23F1/46C25D21/18
Inventor 卿江
Owner 卿江