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A method for removing and recovering arsenic in water by copper powder replacement

A technology of copper powder and water body, applied in chemical instruments and methods, copper halide, copper chloride and other directions, to achieve the effect of easy realization, high efficiency and renewable utilization

Active Publication Date: 2016-06-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies of the existing technology in the treatment of arsenic pollution in water bodies, and provide a method for copper powder replacement to remove and recover arsenic in water bodies. By adding an appropriate amount of copper powder to a hydrochloric acid system at a certain temperature, it can be effectively removed and recovered. Recovering Arsenic from Water Bodies

Method used

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  • A method for removing and recovering arsenic in water by copper powder replacement

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Take 200mL of As(III) content of 5g / L silver slag leaching solution in the reactor, use hydrochloric acid to adjust the pH of the solution to 0, add 10g of copper powder (60 mesh), and seal the reactor after feeding nitrogen, stirring at a speed of The temperature is 400r / min, the reaction temperature is 60°C, and the replacement time is 10-120min.

[0020] The replacement rate was used to evaluate the replacement and removal effect of copper powder on arsenic in water.

[0021] Table 1 Experimental results of different replacement times

[0022] time / min

Embodiment 2

[0024] 1) Take 200mL of surface water with an As(III) content of 0.1g / L in the reactor, adjust the pH of the solution to 0 with hydrochloric acid, add 10g of copper powder (400 mesh), and seal the reactor after nitrogen gas is introduced, and the stirring speed is 400r / min, the reaction temperature is 60°C, and the replacement time is 10-120min.

[0025] The replacement rate was used to evaluate the replacement and removal effect of copper powder on arsenic in water.

[0026] Table 2 Experimental results of different replacement times

[0027] time / min

[0028] 60

Embodiment 3

[0030] 1) Take 200mL of As(III) content of 5g / L silver slag leaching solution in the reactor, use hydrochloric acid to adjust the pH of the solution to 0, add 10g of copper powder (200 mesh), and seal the reactor after feeding nitrogen, stirring at a speed of The temperature is 400r / min, the reaction temperature is 10-80°C, and the replacement time is 60min.

[0031] The replacement rate was used to evaluate the replacement and removal effect of copper powder on arsenic in water.

[0032] Table 3 Experimental results of different replacement temperatures

[0033] temperature / ℃

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Abstract

The present invention provides a method for copper powder displacement removal and recovery of arsenic in water body, and the method comprises the following steps: (1) adjusting arsenic-containing wastewater pH to 0-3 with hydrochloric acid, under the protection of nitrogen, adding copper powder, sealing a reactor, stirring for reacting in the stirring speed of 100-600r / min at the reaction temperature of 10-80 DEG C, wherein the replacement time is 10-120min; As (III) content of the arsenic containing wastewater is 0.1-20g / L; the mass of the copper powder accounts is 5-100g / L by volume of the wastewater; (2) after the completion of the replacement, filtering the reaction system, recovering the filtering slag, and fast recrystallizing the filtrate at low temperature to obtain crystals; the method is simple in process, free of secondary pollution, economic and environmentally friendly, and realizes resource reproducible utilization.

Description

(1) Technical field [0001] The invention relates to a method for removing and recovering arsenic in water by copper powder replacement, and belongs to the technical field of heavy metal water treatment. (2) Background technology [0002] In recent years, the widespread application of arsenic and its compounds in medicine, alloys, pesticides, electronics and other fields has greatly promoted the mining and smelting of arsenic-containing compounds, which has allowed a large amount of arsenic to enter the biosphere. However, arsenic is highly toxic, and long-term excessive intake will cause serious damage to human health, leading to chronic and acute poisoning and even cancer. The problem of arsenic pollution needs to be solved urgently. Arsenic pollution refers to environmental pollution caused by arsenic or its compounds. According to different carriers of pollution, it can be divided into air pollution, soil pollution and water pollution. Water pollution is the greatest th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01G3/05C01G28/00
Inventor 郑国渠伍廉奎曹华珍
Owner ZHEJIANG UNIV OF TECH