Method for treating arsenic-containing waste acid through calcium carbonate and calcium hydroxide method and feeding equipment

• Main Authors: LI GUOXUE, WAN MINGXIANG, LIANG HONGLIN, WANG YANWEI, ZHANG YUXIN, ZHENG YUANWEN, ZHANG LILI, DU ZHIGUO, MA SHULONG, CHEN ZHIGANG, LIU YU
• Format: Patent
• Language: Chinese; English
• Published: 12.01.2024
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention discloses a method for treating arsenic-containing waste acid through a calcium carbonate and calcium hydroxide method and feeding equipment. The method comprises the following steps: S1, oxidation reaction; s2, carrying out a neutralization reaction; s3, carrying out valuable metal reaction; s4, arsenic and fluorine removal reaction: S41, adding a proper amount of calcium hydroxide into a reaction tank III, carrying out solid-liquid separation after the reaction is finished, carrying out harmless treatment on generated arsenic acid cover slag, and conveying separated liquid into a reaction tank IV; and S42, adding a proper amount of calcium hydroxide into the reaction tank IV, conveying thick slurry generated at the bottom of the reaction tank IV into the reaction tank III at the first stage by using feeding equipment after the reaction is finished, carrying out reaction again, and discharging the rest waste liquid in the reaction tank IV for wastewater treatment. The arsenic-containing waste a