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Method for recovering copper from acidic waste water containing copper

A technology for recovering copper and wastewater, applied in crucible furnaces, electric furnaces, drum furnaces, etc., can solve the problems of inability to obtain high-purity copper, poor copper purity, and difficult separation, and achieve shortened recovery cycle, low recovery cost, The effect of speeding up the reaction rate

Active Publication Date: 2011-02-16
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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Problems solved by technology

The above three methods all involve the treatment of acidic copper-containing wastewater. The first method can only obtain a copper salt, but cannot obtain high-purity copper elemental substance, while the second method uses iron filings to replace copper, and the replaced copper Coated on iron filings, the two are difficult to separate, resulting in poor copper purity, and subsequent high-temperature smelting is required to obtain relatively pure copper ingots. The third type of copper is adsorbed on iron filings during the reaction process. Continuously beat the iron filings to make the copper powder attached to it fall off, but during the beating process, the shaken off copper powder is inevitably mixed with the iron powder that falls at the same time due to the beating, and there is also a difference in the purity of the copper. The problem

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  • Method for recovering copper from acidic waste water containing copper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 2 tons of acidic copper-containing wastewater into the acid-resistant reaction tank, measure the concentration of copper ions in the solution to 26.45g / L, and calculate the amount of iron required. Add a small amount of dilute sulfuric acid to adjust the pH value of the solution to 0.5, add 50g of additives and stir evenly, then throw 90kg of scrap iron nets into the copper-containing wastewater at one time and immerse in the solution. When the reaction was carried out for about 2 hours, the pH value of the whole solution reached about 6. At this time, the remaining copper ion concentration in the solution was only 16.32mg / L, and more than 99% of the copper in the solution was replaced. The net is stirred in the solution for a few times, and then it is taken out. There is no copper attached to the iron net. The recovered waste liquid is discharged into the acid waste water collection tank, and then the copper powder at the bottom of the tank is taken out, washed with...

Embodiment 2

[0019] Add 2 tons of acidic copper-containing wastewater into the acid-resistant reaction tank, measure the concentration of copper ions in the solution to 31.42g / L, and calculate the amount of iron required. Add a small amount of dilute sulfuric acid to adjust the pH value of the solution to 1.0, add 30g of additives and stir evenly, then throw 166 kg of scrap iron nets into the copper-containing wastewater at one time and immerse in the solution. When the reaction was carried out for about 2 hours, the pH value of the whole solution reached about 6. At this time, the remaining copper ion concentration in the solution was only 16.53mg / L, and more than 99% of the copper in the solution was replaced. The net is stirred in the solution for a few times, and then it is taken out. There is no copper attached to the iron net. The recovered waste liquid is discharged into the acid waste water collection tank, and then the copper powder at the bottom of the tank is taken out, washed wi...

Embodiment 3

[0021] Add 5 tons of acidic copper-containing wastewater into the acid-resistant reaction tank, measure the concentration of copper ions in the solution to 21.26g / L, and calculate the amount of iron required. Add a small amount of dilute sulfuric acid to adjust the pH value of the solution to 1.5, add 100g of additives and stir evenly, then throw 166 kg of scrap iron nets into the copper-containing wastewater at one time and immerse in the solution. When the reaction was carried out for about 2.5 hours, the pH value of the whole solution reached about 6. At this time, the remaining copper ion concentration in the solution was only 21.58mg / L, and more than 99% of the copper in the solution was replaced. The iron net is stirred in the solution for a few times, and then taken out. There is no copper attached to the iron net. The recovered waste liquid is discharged into the acid waste water collection tank, and then the copper powder at the bottom of the tank is taken out, washed ...

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Abstract

The invention discloses a method for recovering copper from acidic waste water containing copper, which belongs to the technical field of resource recovery. The method comprises the following steps: regulating the pH value of the waste water containing copper to 0.5-1.5; and adding a fixed quantity of additives, evenly mixing, adding iron, and carrying out replacement reaction to obtain the copper powder of which the copper content is higher than 99%. The obtained copper powder does not need high-temperature smelting purification, and can naturally shed without continuous knocking; and the purity and recovery rate can reach more than 99%.

Description

technical field [0001] The invention relates to a resource recovery technology, in particular to a method for recovering copper from acidic copper-containing wastewater. Background technique [0002] Acidic copper-containing wastewater is produced during the chemical preparation of precious metals in the precious metal industry. The wastewater is mainly copper nitrate, and the copper content is about 20-35 grams per liter. Therefore, in order to reduce the cost of wastewater treatment, improve the utilization rate of copper and reduce the cost of enterprises, it is very necessary to recycle copper in these wastewaters. [0003] At present, the common method used in the industry to treat copper-containing wastewater is to convert the copper ions in the waste liquid into other copper salts, that is, to add alkali to the acidic copper-containing waste liquid to neutralize, to obtain copper hydroxide precipitation, and then pass through sulfuric acid Copper sulfate is obtained...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B15/00
Inventor 鲁香粉翁桅柏小平黄光临颜小芳刘立强
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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