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Gas mud sewage is one of the main industrial wastewater of the iron and steel enterprises, with a large amount of water, high temperature, high suspended solids. If not handled properly, not only directly affect the normal production of the blast furnace, but will also cause serious environmental pollution and water waste. Anshan Iron and Steel Group saddle the mining company Qidashan iron ore processing factory filter plant gas Slurry processing into Burden impact of changes in production systems due to the Anshan Iron and Steel Group, Angang Steel Company ironmaking plant blast furnace gas, water treatment systems reduced the amount of mud, gas mud iron grade from 50% down to about 35%, but an increase in the toner content (above 40%), resulting in high turbidity overflow (overflow suspended solids content of more than 10000ppm) Propane Slurry Processing, low solids recovery overflow water can not come back and difficult issues such as dehydration has been plagued by production operation of the site, arranged in one of the main factors of excessive emissions for Angang Xidagou drainage and overflow water. Therefore, to carry out the gas mud wastewater flocculation technology research, and explore the the processing gas mud wastewater economic, efficient flocculant, proper governance of the gas mud wastewater to be recycled, improve water recycling rate, reduce emissions and protect the environment to ensure the safety of blast furnace, efficient production has important significance. In this study polyacrylamide (PAM), PAC (PAC) and ferric sulfate (PFS) aligned mountains iron ore gas dirt water of samples for chemical flocculation experiments, in determining the best flocculant dosage and use pH value, this three flocculant treatment effect experiments carried out in conjunction with the CaO. The study showed that the polyacrylamide (PAM), the best flocculation effect, the best use of parameters, 3.5mg / L wastewater, pH9.0, and mixed with calcium oxide added in an amount of 100mg / L wastewater. Industrial field experiments carried out on an experimental basis in the laboratory, according to the following dosage, wherein CaO configuration concentration of 10%, the dosage is 100-200g/m3 water, the preparation of polyacrylamide (PAM) concentration of 10% , plus a dose 1-2g/m3 water. The application of experimental effluent sampling test results showed that, after normal use of the medicament, the concentration of suspended solids in the effluent can be stabilized at 100ppm or less. After joining the flocculant, the production of filter cake moisture ≤ 25% stems, 20.3% of the output water, fully able to meet the production requirements. Beneficiation evaluation showed that the treated overflow water affect the flotation reagent system, after adjust the pharmaceutical system, there is no negative impact on the flotation concentrate, tailings grade. Gas muddy water after treatment can recycle and reuse. Calcium oxide with addition of PAM as an efficient flocculant to treat Qidashan iron ore beneficiation plants filter plant gas mud not only solved the production problems facing Qidashan Iron, the outer drainage to discharge, and has to use less, low cost, the advantages of high efficiency.
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