Treatment method and system of waste water produced by acid preparation from pyrite

Abstract

The invention discloses a treatment method and system of waste water produced by acid preparation from pyrite and belongs to the technical field of acid-containing waste water treatment. The treatment method comprises waste water oxidation treatment, pretreatment, first-order reaction, first-order flocculation, first-order settlement, second-order reaction, second-order flocculation, second-order settlement, third-order reaction, third-order flocculation and third-order settlement. The treated waste water has average arsenic content of 0.26mg / L, an arsenic removal rate greater than or equal to 99% and a fluorine removal rate greater than 90%, and low Pb, Cd, Cr and Hg contents, satisfies the national standards and can be discharged or recovered and recycled by little treatment or without treatment.

Description

technical field [0001] The invention belongs to the technical field of acid-containing wastewater treatment, and in particular relates to a treatment method and a system for treating pyrite acid wastewater. Background technique [0002] A large amount of SO will be produced during the smelting of metal sulfide ores 2 Flue gas, the part of SO 2 Sulfuric acid is usually prepared from flue gas by smelting flue gas acid production process, and the flue gas purification process in the smelting flue gas acid production process widely adopts wet scrubbing flue gas purification technology for SO 2 Flue gas purification. Thanks to SO 2 The flue gas contains a large number of harmful impurities, including arsenic and heavy metal ions such as copper, lead, and cadmium, especially the high content of arsenic. This part of harmful impurities is deposited in the circulating washing water during the washing process, and the circulating washing water absorbs SO in the flue gas 2 Acidic...

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Problems solved by technology

[0003] 1. The removal effect of arsenic is good, but the removal effect of F, Pb, Cd, Cr and Hg is not good;

[0004] 2. The arsenic removal effect is not very ideal. The arsenic concentration in the supernatant precipitated by the system is lower than the national standard of 0.5mg / L, but there is still room for decline. The introduction of the new national standard may not meet the emission standard;

[0005] 3. The treated solid waste contains a variety of heavy metals, which is not easy to deal with. The components in the sludge tanks are very complicated. If they are mixed together, it will be difficult to deal with them.

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