Evaporation Concentration and Recovery of Waste Acid Technology

At present, the large discharge of acid-containing wastewater not only pollutes the environment and wastes resources, but also increases the production cost of the company. A few days ago, the reporter learned from Beijing Tianjiu Kaitai Chemical Technology Co., Ltd. that the company used advanced tower technology to develop a new type of high-efficiency waste acid recovery treatment process and equipment, so that the concentration of hydrochloric acid recovered to more than 15%, directly used in production, While achieving "zero emissions", it has greatly saved production costs.

At present, the recovery of hydrochloric acid waste water and waste hydrochloric acid is mainly based on the firing method, extraction method and evaporation method. Burning method imported from abroad, large-scale equipment, large investment, high energy consumption, and the existence of secondary pollution, mainly for large iron and steel enterprises; extraction method is complicated to operate, large investment; evaporation method, although low investment, easy operation, but The concentration of hydrochloric acid recovered is low, it cannot be used directly, and the corrosion is serious. The operation of the equipment generally does not exceed 3 months. The efficient evaporation technology developed by Beijing Tianjiu Kaitai uses specially designed evaporation equipment, vaporization equipment and compound tower distillation concentration technology to overcome the shortcomings of the traditional process, with short process flow, easy operation, low investment, low energy consumption, Low operating costs and other characteristics. This technology can be used not only for the recovery of waste hydrochloric acid, but also for the concentrated treatment of dilute sulfuric acid and phosphoric acid.

The company has successfully applied this technology to the rare earth production of domestic companies. The waste acid treatment capacity of a single set of equipment in the first phase of the project has been put into use at a capacity of 5 tons/hour. The second-phase project, with a design capacity of 15 tons/hour, is expected to be put into use at the end of this year. At that time, the annual recovery of hydrochloric acid will reach 20,000 tons, and the purchase of new acids will be reduced by half, so that environmental protection investment will achieve good social and economic benefits.