Technique for extracting copper ions from industrial wastewater
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A technology for industrial wastewater and copper ions, which is applied in ion exchange water/sewage treatment, copper sulfate, water pollutants, etc., can solve problems such as heavy metal ion pollution, achieve environmental protection, increase extraction rate, and simple arsenic removal process Effect
Active Publication Date: 2015-02-18
清远市中宇环保实业有限公司
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[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a process for extracting copper ions from industrial wastewater, which can greatly improve the extraction rate (or removal rate) of copper ions, and not only solve the problem of heavy metal ions on the environment Pollution problems, and the waste liquid can be recycled to produce other products, which saves resources and protects the environment
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Embodiment 2
[0032] A process for extracting copper ions from industrial waste water, comprising the following steps:
[0033] 1) Pretreating the acidic copper-containing etching waste liquid and the alkaline copper-containing etching waste liquid to remove suspended impurities and arsenic pollutants respectively;
[0034] 1-1) Pretreatment for removing arsenic pollutants from acidic copper-containing etching waste liquid:
[0035] Add 8g KMnO to every 1000mL acidic copper-containing etching waste solution 4 reagent dosing method, and add 80mL concentration of 12.0% NH 3 ·H 2 O, stirred for 20 minutes, and stood still for 45 minutes; under this condition, the removal effect of arsenic reached the best, which could reach 98%;
[0036] 1-2) Pretreatment of alkaline copper-containing etching waste liquid to remove arsenic pollutants: adding 1.2 g of magnesium chloride to every 1000 grams of alkaline copper-containing etching waste liquid;
[0037] 2) Neutralization and precipitation: neut...
Embodiment 3
[0043] A process for extracting copper ions from industrial waste water, comprising the following steps:
[0044] 1) Pretreating the acidic copper-containing etching waste liquid and the alkaline copper-containing etching waste liquid to remove suspended impurities and arsenic pollutants respectively;
[0045] 1-1) Pretreatment for removing arsenic pollutants from acidic copper-containing etching waste liquid:
[0046] Add 8g KMnO to every 1000mL acidic copper-containing etching waste solution 4 The reagent dosing method, and add 80mL concentration of 12.0% NH 3 ·H 2 O, stirred and reacted for 20 minutes, and stood still for 45 minutes; under this condition, the removal effect of arsenic reached the best, which could reach 98%;
[0047] 1-2) Pretreatment of alkaline copper-containing etching waste liquid to remove arsenic pollutants: adding 1.2 g of magnesium chloride to every 1000 grams of alkaline copper-containing etching waste liquid;
[0048]2) Neutralization and prec...
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Abstract
The invention discloses a technique for extracting copper ions from industrial wastewater, which comprises the following steps: 1) respectively pretreating an acidic coppery etching waste liquid and an alkaline coppery etching waste liquid; 2) neutralization and precipitation: carrying out neutralization reaction on the acidic coppery etching waste liquid and alkaline coppery etching waste liquid in a neutralizing tank, and precipitating to obtain a basic copper chloride precipitate and a filtrate; 3) adding the basic copper chloride precipitate into a reaction tank, and adding sulfuric acid to obtain a copper sulfate crystal; 4) sending the filtrate into an ion exchange resin tower to adsorb the rest unrecovered copper ions, thereby obtaining ammonia nitrogen wastewater; and 5) carrying out evaporative concentration on the ammonia nitrogen wastewater by a vapor recompression technique, crystallizing the concentrate to produce an ammonium chloride product, treating the condensation water by an ion-exchange process, and discharging after reaching the standard. The technique can greatly enhance the extraction rate of copper ions, solves the problem of environmental pollution caused by heavy metal ions, and can produce other products from the waste liquid to implement cyclic utilization, thereby saving the resources and protecting the environment.
Description
technical field [0001] The invention relates to a waste liquid recovery method, in particular to a process for extracting copper ions from industrial waste water. Background technique [0002] Printed circuit board etching waste (also known as PCB etching waste) includes acidic copper-containing etching waste and alkaline copper-containing etching waste. The total amount of copper in the etching waste is about 50,000 tons per year. These etching waste liquids have the characteristics of various types, high toxicity, and strong corrosiveness. They belong to the national first-class hazardous waste. If they are discharged without treatment, they will cause extremely serious damage to the ecology, and even seriously threaten people's lives. If a large amount of waste liquid cannot be effectively recycled, a large amount of copper resources will be wasted and water resources will be polluted. [0003] At present, chemical methods, ion exchange methods, membrane separation metho...
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