Electroplating sludge treating and utilizing process

A technology for electroplating sludge and treatment methods, which is applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc. It can solve the problems of inability to realize resource utilization, large energy consumption, and high cost. problems, to achieve the effect of simple and easy purification, improved economic benefits, and high recovery rate

Inactive Publication Date: 2007-11-07
台州盛世环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the defects that the existing electroplating sludge treatment method cannot realize resource utilization, large energy consumption and high cost; it provides a novel resource treatment method of electroplating sludge, which not only consumes less energy but has low cost; and It can convert most of the chromium, copper and nickel in the electroplating sludge into dichromate, nickel salt and copper powder with high economic benefits and obtain other by-products; thus realizing the resource utilization of electroplating sludge

Method used

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  • Electroplating sludge treating and utilizing process
  • Electroplating sludge treating and utilizing process
  • Electroplating sludge treating and utilizing process

Examples

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Effect test

Embodiment 1

[0075] As shown in Fig. 1, Fig. 2 and Fig. 3: the specific technological process of the novel resource treatment method of electroplating sludge of the present invention is

[0076] A. Alkali addition and roasting: Dry 5 tons of electroplating sludge at a temperature of 100°C, add 0.2 tons of sodium carbonate after drying and roast at a temperature of 400°C for 100 minutes to make Cr 3+ →Cr 6+ After the conversion rate reaches more than 90%, add 4 tons of water, heat to 90 ℃ to leach all soluble metals, and filter through a filter press (manufactured by Hangzhou Chuangyuan Company) to separate the alkali leaching residue and alkali leaching solution; The leaching residue is rinsed with water for 2 to 3 times before use, and the water after rinsing is returned to the above leaching water before leaching;

[0077] B. Refined dichromate: add concentrated sulfuric acid with a concentration of 90% to the alkali immersion solution separated by the above-mentioned pressure filtratio...

Embodiment 2

[0080] As shown in Fig. 1, Fig. 2 and Fig. 3: the specific technological process of the novel resource treatment method of electroplating sludge of the present invention is

[0081] A. Alkali addition and roasting: Dry 5 tons of electroplating sludge at a temperature lower than 100°C. After drying, add 0.2 to 0.3 tons of sodium carbonate and roast at a temperature of 400 to 800°C for 80 minutes to make Cr 3+ →Cr 6+ After the conversion rate reaches over 90%, add 5 tons of water and heat to 92°C to extract Cr +6 , through a filter press (manufactured by Hangzhou Chuangyuan Co., Ltd.) to separate the alkali leaching residue and alkali leaching solution; wherein the alkali leaching residue is rinsed with water for 2 to 3 times and then used, and the water after rinsing is returned to the above-mentioned leaching water;

[0082] B. Refined dichromate: add concentrated sulfuric acid with a concentration of 95% to the alkaline immersion solution separated by the above-mentioned pre...

Embodiment 3

[0085] As shown in Fig. 1, Fig. 2 and Fig. 3: the specific technological process of the novel resource treatment method of electroplating sludge of the present invention is

[0086] A. Alkali addition and roasting: Dry 5 tons of electroplating sludge at a temperature of 100°C, add 0.3 tons of sodium carbonate after drying and roast at a temperature of 800°C for 100 minutes to make Cr 3+ →Cr 6+ After the conversion rate reaches more than 90%, add 6 tons of water, heat to 95° C. to leach all soluble metals, and filter through a plate and frame filter press (manufactured by Hangzhou Chuangyuan Company) to separate the alkali leaching residue and alkali leaching solution; Wherein the alkali leaching residue is rinsed with water for 2 to 3 times before use, and the water after rinsing is returned to the above alkali leaching solution;

[0087] B. Refined dichromate: Add the above-mentioned alkali immersion solution separated by pressure filtration into 98% concentrated sulfuric ac...

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Abstract

The electroplating sludge treating and utilizing process includes the following steps: 1. adding alkali to stoved electroplating sludge, roasting, leaching out soluble metal in dilute alkali solution, and filtering to obtain alkali leached slag and alkali leached liquid; 2. adding acid to the alkali leached liquid, filtering to obtain hydrolyzed slag and hydrolyzed liquid, and preparing bichromate with the hydrolyzed liquid; and 3. dissolving the alkali leached slag in acid solution, filtering, electrodepositing the filtrate and filtering to obtain electrodeposited solution, depurating the electrodeposited solution and crystallizing to obtain nickel salt. The process has low power consumption and low cost, and can convert most of Cr, Cu and Ni in electroplating sludge into bichromate, nickel salt, copper powder and other side product.

Description

technical field [0001] The invention relates to a treatment method for electroplating sludge, in particular to a novel recycling treatment method for electroplating sludge. Background technique [0002] Electroplating sludge is the sediment produced during the treatment of electroplating sewage. Its main components are chromium, iron, copper, nickel, aluminum, zinc, magnesium, calcium, silicon, sulfur, cyanide, etc., because it contains a large amount of toxic and harmful heavy metals. Controlled toxic industrial solid waste, and due to the development of modern industry, the discharge of electroplating sludge is increasing. If large-scale electroplating sludge is not properly treated to eliminate toxic and harmful substances, it will cause serious damage to the environment. Destructive effect, endangering human health. [0003] Recycling and harmless treatment of electroplating sludge to eliminate its secondary pollution to the environment has long been the focus of enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/12C01G37/14C01G53/00C02F103/16
Inventor 李长友
Owner 台州盛世环境工程有限公司
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