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

A treatment method and pyrite technology are applied in the treatment method and system field of pyrite acid-making wastewater, which can solve the problems of decline, unsatisfactory arsenic removal effect, complex composition and the like

Active Publication Date: 2016-02-24
HUBEI XIANGYUN GROUP CHEM
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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.

Method used

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

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Embodiment 1

[0031] see figure 1 , Embodiment 1 provides a kind of treatment system of pyrite acid production waste water, and this system comprises sludge pool, copper sulfate adding device 14, ferric sulfate adding device 18, alkali adding device 16, cationic flocculant adding device 13, anion Flocculant adding device 17 and oxidation reaction tank 1, pretreatment tank 2, primary reaction tank 3, primary coagulation tank 4, primary sedimentation tank 5, secondary reaction tank 6, and secondary coagulation tank 7 connected in sequence , the secondary flocculation tank 8, the secondary sedimentation tank 9, the tertiary reaction tank 10, the tertiary coagulation tank 11 and the tertiary sedimentation tank 12, etc. Wherein, the copper sulfate adding device 14 is connected with the primary reaction pool 3 and the secondary reaction pool 6, and the iron sulfate adding device 18 is connected with the tertiary reaction pool 10. The sludge tank is connected with the primary sedimentation tank 5...

Embodiment 2

[0038] see figure 1 , Example 2 provides a treatment method for pyrite acid-making wastewater. The main process of the method is: inject the wastewater into the oxidation reaction tank 1 to react with the oxidant (sodium hypochlorite solution), oxidize for a certain period of time, and transport it with the oxidizing solution The pump is pumped into the pretreatment tank 2 to react with milk of lime to control the pH value; after pretreatment, the waste water is sent to the primary reaction tank 3, and liquid caustic soda and copper sulfate are added to the primary reaction tank 3 to control a certain pH value With the addition of copper sulfate. When the mixed solution overflows into the primary coagulation tank 4, a certain amount of cationic flocculant is added. After the liquid in the primary coagulation tank 4 overflows to the primary sedimentation tank 5 for sedimentation and separation, the supernatant of the primary sedimentation tank 5 overflows into the secondary re...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/52C02F1/72C02F9/00C02F2103/16
Inventor 李小洪叶良俊曹理军吕景祥祝翠华余双强查炎华胡玉峰
Owner HUBEI XIANGYUN GROUP CHEM
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