Metallurgical waste acid and wastewater treatment method
A sewage treatment method and sewage acid technology, which are used in metallurgical wastewater treatment, water/sludge/sewage treatment, water/sewage multi-stage treatment, etc. , increased operating costs and other problems, to achieve the effect of solving calcium and magnesium scaling, low operating costs, and simple operation
Active Publication Date: 2017-05-31
YUNNAN TIN
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Problems solved by technology
At present, the reuse water treated by the "sulfurization-lime-iron salt" method in the treatment of metallurgical wastewater can only meet the discharge standard of copper-nickel industrial pollutants, and cannot reduce the total hardness for deep secondary treatment and reuse.
The "lime-soda ash" method adopted at this stage reduces the total hardness. Although the hardness is reduced, the pH value is too high, and the pH value needs to be adjusted twice, which increases the operating cost.
Method used
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[0013] Such as figure 1 Shown, the method step of the polluted acid sewage that produces in the processing metallurgical process of the present invention is as follows:
[0014] (1) One-stage treatment: pump the polluted acid sewage into the reaction tank and add calcium hydroxide, without controlling the dosing ratio, control the pH value between 10-11, and the reaction residence time is 30 minutes, and then carry out solid-liquid separation, separation The final arsenic-calcium slag is safely opened, and the filtrate is pumped into the second stage for treatment;
[0015] (2) Two-stage treatment: pump the filtrate after one-stage treatment into the two-stage reaction tank and add a sodium carbonate solution with a mass concentration of 15% in the reaction tank. The dosage is adjusted according to the total hardness of the filtrate. At the outlet of the tank, add an acidic iron solution with a pH value between 1-2 and containing more than 90g / L of ferric ions, such as a mixe...
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The invention relates to a metallurgical waste acid and wastewater treatment method. A three-section treatment method is used; for first-section treatment, calcium hydroxide is added into the waste acid and wastewater for regulating and controlling the PH value to be 10 to 11; dregs containing arsenic and calcium are removed through solid-liquid separation; for second-section treatment, a sodium carbonate solution and an acid iron solution are added into filter liquid subjected to the first-section treatment; the PH is controlled to be 9.5 to 11, so that calcium carbonate dregs and iron arsenic complex dregs are formed in water, and are removed through solid-liquid separation; for third-section treatment, filter liquid produced through the second-section treatment is added into an acid iron solution; the PH is controlled to be 6 to 9; the solid-liquid separation is performed to remove the iron arsenic complex dregs; the filter liquid flows into deep membrane treatment or is directly reused. The heavy metal is removed; meanwhile, the total hardness is reduced; in addition, the process is simple; the operation cost is low.
Description
technical field [0001] The invention relates to the technical field of methods for reducing total hardness and removing arsenic in metallurgical acid sewage. [0002] technical background [0003] In the metallurgical industry, the output of wastewater is far greater than the consumption. To meet the current national environmental protection requirements and achieve zero discharge, the produced wastewater must be subjected to advanced treatment. At present, enterprises in China that want to achieve zero discharge of sewage are still in the exploration stage, and various treatment methods have their own advantages and disadvantages, but the investment capital or production costs are huge, such as the multi-effect evaporation process. There are generally two methods for metallurgical wastewater to meet the requirements of zero discharge, one is evaporation, and the other is advanced treatment and recycling. Combined with the sewage acid sewage treatment process in the metallur...
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Patent Timeline
Login to View More IPC IPC(8): C02F9/04C02F103/16C02F101/10C02F101/20
CPCC02F1/001C02F1/44C02F1/66C02F9/00C02F2101/103C02F2101/20C02F2103/16C02F2301/08C02F2303/22
Inventor 徐万立蔡辉杨洪才李正中李用法
Owner YUNNAN TIN