Processing equipment and technique for waste acid and water

Abstract

The invention relates to waste acid and water processing equipment and a technique for processing acidic sewage generated in the process of purification of an acid making system. The technique comprises the following steps: pumping the waste acid into a first-level neutralizing reaction tank in the first stage; adding calcium carbide slag to adjust the pH value between 1 and 6; adding calcium carbide slag to adjust the pH value between 5 and 6, when the liquid overflows into a second-level neutralizing reaction tank in the first stage; carrying out solid-liquid separation; entering a sewage pool; pumping the liquid in the sewage pool into a first-level neutralizing reaction tank in the second stage; adding lime milk to adjust the pH value between 6 and 7; adding lime milk to adjust the pH value between 7 and 8, when the liquid gravitationally flows into a second-level neutralizing reaction tank in the second stage; adding 7% of sodium sulphide and 15% of ferrous sulfate according to weight percentage into a vulcanization and flocculation reaction tank, when the liquid gravitationally flows into the vulcanization and flocculation reaction tank; carrying out solid-liquid separation of fine particles on the liquid by a filter press and a film filter; discharging the liquid, thus the continuous up-to-standard discharging of effluent water is easily realized.

Description

technical field [0001] The present invention relates to a sewage treatment device and process suitable for the harmless treatment of polluted acid produced by a sulfuric acid system using a dilute acid washing and purification process, in particular to a pyrotechnic treatment of non-ferrous metal sulfide ores such as lead and zinc. Smelted SO 2 Sewage acid sewage treatment device and treatment process for the purification process of the flue gas acid system and the acid sewage rich in heavy metal ions produced by wet smelting. Background technique [0002] At present, lime stirring and neutralization, iron salt aeration oxidation, thickener and settling tank sedimentation, and pressure filtration are mostly used in the process of sewage acid and sewage treatment discharged from lead and zinc pyrometallurgy acid production systems and wet smelting workshops. Traditional processes such as mechanical solid-liquid separation. This process has the disadvantages of long process ...

AI Technical Summary

Problems solved by technology

This process has the disadvantages of long process flow, high operating cost, incomplete solid-liquid separation, unstable external drainage control, large floor area, and poor system operation flexibility.

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