System and method for removing heavy metals and arsenic from acidic waste water of smelting gas acid making

• Main Authors: HE SHAOFANG, SONG XIAOHU, FANG YONGSHUI, SUN ZHIZHONG, AI HAIYUAN, SHI WANJING, LI SHANDONG, MA JUN, LIU NA, WANG CHAOWEN, LU BAZHI, LIU BINGBO
• Format: Patent
• Language: Chinese; English
• Published: 28.11.2017
• 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 discloses a system and method for removing heavy metals and arsenic from acidic waste water of smelting gas acid making, and belongs to the technical field of chemical engineering. Hydrogen sulfide gas is forcedly pressed into the acidic waste water by a totally-enclosed tubular pressurized reactor at first, the circumstance that a large amount of hydrogen sulfide gas overflows is avoided, the removal rate of the heavy metals and the arsenic from the acidic waste water is increased effectively, and the use amount of sodium sulfide is reduced; a negative-pressure suction method is adopted, and the circumstances that a sodium sulfide solution reversely flows into an acid water buffering pump and the hydrogen sulfide gas overflows are avoided; a two-stage absorption negative-pressure degassing method is adopted, the hydrogen sulfide gas in acidic waste water mixed liquor is absorbed, and discharged tail gas reaches the standard; and a vacuum degassing method is adopted, the hydrogen sulfide gas in