Method for diluted acid reinforcement arsenic removal of smelting acid-making purifying system

Abstract

The invention discloses a method for diluted acid reinforcement arsenic removal of a smelting acid-making purifying system. The method comprises the steps of introducing smelting flue gas into a purifying system with a liquid spraying assembly, and obtaining arsenic-containing diluted acid; wherein the liquid spraying assembly comprises a spraying liquid inlet; introducing the arsenic-containing diluted acid into a vulcanization assembly to perform vulcanization treatment, and filtering the liquid having undergone vulcanization treatment to obtain vulcanized filtrate. According to the method, the vulcanized filtrate with a large arsenic content is introduced back to the purifying system to replace a cleaning solution for use, so that the use amount of the cleaning solution can be reduced, the vulcanized filtrate with a large arsenic content can undergo circulating vulcanization treatment many times, until the arsenic content of the vulcanized filtrate meets the national discharge standard, and then filtrate is treated through a sewage treatment assembly and then discharged. According to the method, 2 / 3 of arsenic-containing neutralization slag can be reduced, and the huge cost of treating dangerous chemical products is saved. Discharged sewage with a qualified arsenic content is also reduced, and the basis is laid for smelting sewage zero discharge of enterprises.

Description

technical field [0001] The invention relates to the technical field of pollutant treatment, in particular to a dilute acid enhanced arsenic removal method in a smelting acid purification system. Background technique [0002] The purification system of the smelting acid system is an important system to remove impurities in the flue gas. It mainly washes the impurities in the flue gas by liquid spraying, and then the impurities enter the circulating liquid and become waste acid stock solution (acidity is 7%- 8%). The waste acid stock solution mainly contains metal ions such as As and Cu. The waste acid stock solution enters the waste acid system for vulcanization to remove As, and the treated liquid enters the wastewater neutralization system for acid removal. When the As content in the flue gas increases, the As in the waste acid also increases. On the one hand, in order to prevent the subsequent processes from being affected, the purification system will increase the water...