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A method for preparing copper powder and ferrous sulfate using copper-containing sludge wet leaching solution

A technology of ferrous sulfate and copper sludge, which is applied in the direction of ferric sulfate and process efficiency improvement, can solve the problems of difficult resource utilization, incomplete metal separation, low added value of products, etc., and achieve high resource utilization rate , Significant economic benefits, the effect of reducing emissions

Active Publication Date: 2018-09-18
厦门资生环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to overcome the incomplete metal separation of the leachate in the process of copper-containing sludge treatment and disposal mentioned in the background technology, the low added value of the product, the difficulty in realizing resource utilization, large energy consumption, high cost, Insufficiencies and defects such as polluting the environment, providing a method for preparing copper powder and ferrous sulfate using copper-containing sludge wet leaching solution

Method used

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  • A method for preparing copper powder and ferrous sulfate using copper-containing sludge wet leaching solution
  • A method for preparing copper powder and ferrous sulfate using copper-containing sludge wet leaching solution
  • A method for preparing copper powder and ferrous sulfate using copper-containing sludge wet leaching solution

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Effect test

Embodiment 1

[0041] The copper-containing sludge comes from the sewage treatment plant of a printed circuit board enterprise in Hunan. The sludge containing Cu is obtained after microbial leaching. 2+ 12.4g / L, Fe 2+ 20.3g / L, Fe 3+ 21.6g / L, Al 3+ 0.8g / L, Cr 3+ 0.5g / L wet leaching solution, the pH value of the wet leaching solution is 2.0.

[0042] Such as figure 1 As shown, adopting the method of the present invention to utilize the above-mentioned copper-containing sludge wet leaching solution of the present embodiment to prepare copper powder and ferrous sulfate, specifically comprises the following steps:

[0043] ① Fine filtration of leachate: take 2L of copper-containing sludge wet leaching solution, first filter through fast filter paper to remove large suspended particles in the leaching process, and obtain leachate after fine filtration;

[0044] ② Iron powder replacement: transfer the finely filtered leaching solution to a 5L reaction vessel with a stirring device, control the...

Embodiment 2

[0053] The copper-containing sludge comes from a sewage treatment plant of a surface treatment company in Wuxi, and the sludge containing Cu is obtained after microbial leaching. 2+ 3.6g / L, Fe 2+ 24.3g / L, Fe 3+ 14.6g / L, Al 3+ 1.2g / L, Cr 3+ 1.4g / L wet leaching solution, pH 1.5.

[0054] Using the method of the present invention to prepare copper powder and ferrous sulfate using the copper-containing sludge wet leaching solution of the present embodiment above, specifically comprises the following steps:

[0055] ①Finish filtration of leachate: take 100L of copper-containing sludge wet leaching solution, first filter through -600 mesh filter cloth to remove large suspended particles in the leaching process, and obtain leachate after fine filtration;

[0056] ② Iron powder replacement: transfer the finely filtered leaching solution to a 200L reaction tank with a stirring device, control the stirring line speed of the reactor at 4m / s, add 470g of iron powder in an amount 1.5 t...

Embodiment 3

[0062] The copper-containing sludge comes from a sewage treatment plant in an electroplating park in Jiangsu. After the sludge is leached by microorganisms, the copper-containing sludge is obtained. 2+ 5.4g / L, Fe 2+ 18.7g / L, Fe 3+ 7.6g / L, Al 3+ 0.8g / L, Cr 3+ 0.01g / L wet leaching solution, pH value is 1.5.

[0063] Using the method of the present invention to prepare copper powder and ferrous sulfate using the copper-containing sludge wet leaching solution of the present embodiment above, specifically comprises the following steps:

[0064] ①Finish filtration of leachate: take 500L copper-containing sludge wet leaching solution, first filter through -600 mesh filter cloth to remove large suspended particles in the leaching process, and obtain leachate after fine filtration;

[0065] ② Iron powder replacement: transfer the leachate after fine filtration to 1m 3 In the reaction tank with stirring device, the linear speed of the stirring device should be controlled

[0066] ...

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Abstract

A method for preparing copper powder and ferrous sulfate by using a solution leached through a sludge containing copper wet method comprises the following steps that firstly, the solution is leached through the sludge containing copper wet method and filtered; the filtered leaching agent is transferred into a reactor, iron powder is added for a replacement reaction, the concentration of Cu2+ in the leaching agent is reduced to be less than 0.5 g / L after the reaction is complete, solid-liquid separation is conducted, and the copper powder and the replaced solution are obtained; a reducing agent is added to the replaced solution, and the redox potential in the replaced solution is controlled to be reduced to be less than 400 mV; the replaced solution is transferred to an impurity removal reaction tank, heating is conducted, an inorganic solution containing phosphate radical is slowly added, solid-liquid separation is conducted, and phosphate precipitate and impurity-removed liquid are obtained; and the concentration of Fe2+ ions in the impurity-removed liquid is increased to be greater than 300 g / L after evaporation and concentration, transferring to a cooling system is conducted for crystallization, and a ferrous sulfate heptahydrate product is obtained after washing. By the adoption of the method, the cost is low, environmental protection is achieved, the added value of products is high, and resource utilization of waste resources can be achieved.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization and treatment and disposal of copper-containing wastewater treatment sludge, in particular to a method for preparing copper powder and ferrous sulfate by using a copper-containing sludge wet solution. Background technique [0002] Industrial copper-containing wastewater mainly comes from the electroplating, electronics, and circuit board industries. The copper-containing sludge obtained after chemical flocculation, neutralization and sedimentation often contains a large amount of copper, which exists in an unstable form and is toxic to heavy metals. According to the "National Hazardous Waste List", copper-containing sludge is a hazardous waste, but the dry-based copper grade of copper-containing sludge is about 3% to 15%, which is much higher than the mineable grade of copper ore, and it is also a high-value waste. metal resources. [0003] Wet leaching technology is one of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B15/00C01G49/14
CPCC01G49/14C01P2006/80C22B7/006C22B15/0091Y02P10/20
Inventor 赵邵安周洪波周文博陈军辉秦荣钢
Owner 厦门资生环保科技有限公司
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