Comprehensive treatment process for electric throwing waste acid and high-iron waste hydrochloric acid
A technology of waste hydrochloric acid and electropolishing, which is applied in metallurgical wastewater treatment, filtration treatment, multi-stage water/sewage treatment, etc., can solve the problems of waste of land resources, high operation cost, low disposal efficiency, etc. The effect of reducing operating costs and increasing disposal costs
Active Publication Date: 2021-08-13
沧州冀环威立雅环境服务有限公司
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Problems solved by technology
No matter what kind of waste acid, it is highly corrosive, and it needs to consume a large amount of alkaline chemicals to neutralize it during treatment, resulting in a large amount of precipitation, low disposal efficiency, and high operating costs. Landfills will cause waste of land resources
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[0025] Take the waste hydrochloric acid produced by a steel processing enterprise and the waste electric acid produced by an auto parts manufacturer as examples. The iron content in the waste hydrochloric acid is 80,000 mg / mL, the zinc content is 10,000 mg / mL, and the phosphoric acid content in the waste electric acid accounts for about 50%. %, sulfuric acid accounts for about 5%;
[0026] Separate disposal process of waste hydrochloric acid: pour 5 tons of waste hydrochloric acid into the reactor, add 50 kg of calcium hypochlorite, add 3.0 tons of milk of lime with a concentration of 10%, and 2.5 tons of liquid caustic soda with a concentration of 30%, and the pH at this time is 9.0 , pressure filtration after 60 minutes of reaction, the filtrate is colorless and transparent, heavy metal is qualified, produces 2.5 tons of sludge (water content 51%) after pressure filtration;
[0027] Separate disposal process of electro-splattered waste acid: add 2 tons of water to the reacto...
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The invention relates to the technical field of hazardous waste treatment, in particular to a comprehensive treatment process for electric throwing waste acid and high-iron waste hydrochloric acid, which comprises the following steps: a, waste liquid proportioning: firstly adding water into a reaction kettle, and respectively pumping the electric throwing waste acid and the waste hydrochloric acid into the reaction kettle according to the mass ratio of (0.5-1.5): 1; b, alkali addition reaction: stirring the solution in the step a, then adding caustic soda liquid with the mass fraction of 30% into the reaction kettle, adjusting the pH value of the solution in the reaction kettle to 6.0-9.0, and reacting for 10-20 minutes; c, primary filter pressing: leading out the solution in the reaction kettle, carrying out filter pressing through a filter press, conveying sludge to a landfill site, and returning filtrate to the reaction kettle; d, adding of calcium hypochlorite for reaction: adding calcium hypochlorite into the reaction kettle, and reacting for 0.5-2 hours; e, secondary filter pressing: leading out the solution in the reaction kettle, carrying out secondary filter pressing by virtue of a filter press, conveying sludge to a landfill, and carrying out biochemical system after the filtrate is analyzed to be qualified. The sludge yield is small, the treatment efficiency is improved, the operation cost is reduced, and the waste of land resources is reduced.
Description
technical field [0001] The invention relates to the technical field of hazardous waste disposal, in particular to a comprehensive disposal process of waste acid from electric throwing and waste hydrochloric acid of high iron. Background technique [0002] As a common hazardous waste, waste acid will pollute surface water, drinking water, and soil; lead to the withering of vegetation and even crops, the death of fish and aquatic organisms; cause corrosion of pipelines, etc., which are extremely harmful to the environment. Waste acid has the characteristics of large amount, wide distribution, strong toxicity, and difficult management. If it is not collected, stored or disposed properly, it will seriously threaten the safety of the ecological environment. [0003] Pickling and galvanizing is a steel treatment process. The purpose is to delay the environmental corrosion of steel materials. Hydrochloric acid is often used as a cleaning agent in the process. A large amount of high...
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Patent Timeline
Login to View More IPC IPC(8): C02F9/04C02F101/16C02F101/20C02F101/10C02F103/16
CPCC02F9/00C02F1/66C02F1/001C02F1/76C02F2101/203C02F2101/101C02F2101/105C02F2101/16C02F2103/16
Inventor 种悦晖刘庆奎马得草张昊岳陈建章王晓鹏孟令娜
Owner 沧州冀环威立雅环境服务有限公司