Device and method for evaporating and reducing emission of acidic wastewater

• Main Authors: JIA XIAOJUN, LI PINGDE, SUN ZHIZHONG, CHI JIAN, SHI WANJING, LIU CHEN, HE SHAOFANG, YANG WENGE, PENG GUOHUA, ZHOU HONGTAO, WANG JINFENG, LU BAZHI, CHI ZHANYANG
• Format: Patent
• Language: Chinese; English
• Published: 08.12.2017
• Subjects: CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention belongs to the technical field of chemical environmental protection equipment and in particular relates to a device for evaporating and reducing emission of acidic wastewater generated in flue gas acid production in non-ferrous metal metallurgy and a method of treating polluted acid by means of the device. The device comprises a purifying, concentrating and reducing system, a sulfidizing system, an insulating and evaporating system and a dry absorbing system which are successively connected through a pipeline. The method comprises the following steps: firstly, performing impurity removal, concentration and reduction on the acidic water; sulfidizing the acidic water to remove heavy metals and arsenic in the acidic water; and insulating and evaporating the acidic water by means of dried discharged gas from the outlet of a secondary absorption tower, wherein gas takes away water as well as hydrogen fluoride and hydrogen chloride and enters a tail gas absorption tower; and an absorption liquid in a