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Process for treating electroplating sludge in non-slag mode

A technology of electroplating sludge and process, applied in the direction of improving process efficiency, etc., can solve the problems of complex process, high processing cost, small processing volume, etc., and achieve the effect of convenient operation, good product quality and low equipment investment

Active Publication Date: 2018-01-19
JIANGXI TONGDE SHENGYUAN NICKEL IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional solvent extraction method, ion exchange method, selective membrane treatment method and biological treatment method have problems such as small processing capacity, complicated process, and high processing cost.

Method used

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  • Process for treating electroplating sludge in non-slag mode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: its technological process carries out according to the following steps:

[0036] (1) Leaching: The electroplating sludge is leached with a leaching agent. During the leaching process, the liquid-solid ratio of the slurry is 0.5. The leaching agent is 98% industrial-grade sulfuric acid. The amount of sulfuric acid added is 0.8 times the theoretical acid consumption. Control the pH value to 1.5, the reaction temperature is 50°C, and the reaction time is 0.5h to obtain the leachate;

[0037] (2) Impurity removal: add Shuangfei powder to the leachate obtained in step (1), adjust the pH value to 2.5, the main component of Shuangfei powder is calcium carbonate, the content is 85%, and the amount of Shuangfei powder added is 0.8 times of the theoretical amount , the reaction time is 0.5h, and the reacted slurry is filtered through a plate-and-frame filter to achieve solid-liquid separation, and the filtrate enters the next process, and the leached slag is stirred...

Embodiment 2

[0042] Embodiment 2: its technical process is carried out according to the following steps:

[0043] (1) Leaching: The electroplating sludge is leached with a leaching agent. During the leaching process, the slurry-solid ratio is 1. The leaching agent is 98% industrial-grade sulfuric acid. The amount of sulfuric acid added is 1.1 times the theoretical acid consumption. The pH value is controlled to be 2, the reaction temperature is 55° C., and the reaction time is 1 hour to obtain a leaching solution;

[0044] (2) Impurity removal: add Shuangfei powder to the leaching solution obtained in step (1), and adjust the pH value to 3.0. The main component of Shuangfei powder is calcium carbonate, with a content of 90%. The amount of Shuangfei powder added is 1.1 times the theoretical amount , the reaction time is 1h, and the reacted slurry is filtered through a plate-and-frame filter to achieve solid-liquid separation, and the filtrate enters the next process, and the leached slag is...

Embodiment 3

[0049] Embodiment 3: its technological process is carried out according to the following steps:

[0050] (1) Leaching: The electroplating sludge is leached with a leaching agent. During the leaching process, the slurry-solid ratio is 0.8. The leaching agent is 98% industrial-grade sulfuric acid. The amount of sulfuric acid added is 0.9 times the theoretical acid consumption. Control the pH value to 1.8, the reaction temperature is 53°C, and the reaction time is 0.8h to obtain the leachate;

[0051] (2) Impurity removal: add Shuangfei powder to the leachate obtained in step (1), and adjust the pH value to 2.8. The main component of Shuangfei powder is calcium carbonate, with a content of 88%. The amount of Shuangfei powder added is 0.9 times the theoretical amount , the reaction time is 0.8h. The reacted slurry is filtered through a plate and frame filter to achieve solid-liquid separation. The filtrate enters the next process. The leached slag is stirred, washed and filtered w...

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Abstract

The invention discloses a process for treating electroplating sludge in a non-slag mode. The process comprises the following steps of: pulpifying the electroplating sludge and then leaching the electroplating sludge by sulfuric acid, adding heavy calcium carbonate powder into leaching liquor to remove part of impurities; then, replacing copper with reducing iron powder, and precipitating chromiumwith caustic soda liquid and magnesium oxide; and finally, adding the caustic soda liquid to precipitate nickel, and enriching noble metals such as gold, silver and palladium in leaching residues. Theprocess has the advantages that: non-ferrous metals such as copper, chromium and nickel, and noble metals such as gold, silver and palladium are comprehensively recycled from electroplating sludge, and recovery rates of copper, chromium and nickel are separately 95-98%, 92-95% and 90-94%; in a treatment process, wastewater is circulated, any poisonous gas is not generated, noble metals Ni, Cu andCr in the material are efficiently recycled, and noble metals such as gold, silver and palladium are enriched in the leaching residues for being recycled, so that non-slag discharge is realized. Theprocess is simple in flow, is high in production efficiency, and is easy for realizing industrialization; and equipment composition is simple, equipment investment is less, and product quality is good.

Description

technical field [0001] The invention relates to a process for treating electroplating sludge without slag, and belongs to the technical field of electroplating sludge treatment. Background technique [0002] Electroplating sludge mainly comes from the solid waste produced by various electroplating waste liquids and electrolytic bath liquids in industrial electroplating plants through liquid-phase chemical treatment. Due to the different production processes and treatment processes of various electroplating manufacturers, the chemical composition of electroplating sludge is complex. , high water content, mainly containing heavy metal compounds such as chromium, nickel, copper and a small amount of gold, silver, palladium and other precious metals. All electroplating enterprises do not have professional technology and professional equipment for simple treatment, so it is difficult to harmless treatment, separation and comprehensive utilization. Long-term stockpiling will lead...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00C22B34/32C22B23/00
CPCY02P10/20
Inventor 李文强汤荷生陈居冈张平
Owner JIANGXI TONGDE SHENGYUAN NICKEL IND CO LTD
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