Agent for removing heavy metals out of desulfurization waste water

Abstract

The invention discloses an agent (SF-CZ-01) for removing heavy metals out of desulfurization waste water. The agent (SF-CZ-01) for removing the heavy metals out of the desulfurization waste water comprises the following components in parts by weight: 15-40 parts of FeClSO4, 30-60 parts of Na2CO3 and 15-30 parts of Na3PO4. The agent (SF-CZ-01) for removing the heavy metals out of the desulfurization waste water has the advantages that FeClSO4, Na2CO3 and Na3PO4 are organically matched, hardness of the treated waste water is lower than 50PPM, SO4<2-> ions in the waste water can be effectively removed and usage amount of neutralization alkali is reduced, so that a slightly alkaline atmosphere after the waste water is neutralized can completely precipitate a part of heavy metals in a colloidal form.

Description

technical field [0001] The invention discloses a desulfurization wastewater de-weighting agent, which belongs to the technical field of desulfurization wastewater treatment according to the International Patent Classification (IPC). Background technique [0002] Large-scale coal-fired power plants emit more and more SO2 from their fuels, and the resulting air pollution is also becoming more and more serious. It is imminent to take desulfurization measures. Currently, flue gas desulfurization (FGD) is considered to be the most effective way to control SO2 emissions. Limestone-gypsum wet flue gas desulfurization is the most widely used and most mature desulfurization process in the world. The desulfurization wastewater produced by this wet flue gas desulfurization process has a pH of 4 to 6 and contains a large amount of suspended matter (gypsum particles , SiO2, hydroxides of Al and Fe), fluorides and trace amounts of heavy metals such as As, Cd, Cr, Hg, etc. Direct dischar...

AI Technical Summary

Problems solved by technology

However, the above-mentioned treatment process is complicated, the operation volume is large, and it is not easy to be automatically controlled. The operation results of most power plants are not ideal. The dosing system includes lime milk dosing system, organic sulfur dosing system, flocculant dosing Medicine system and hydrochloric acid dosing system, many dosing links

[0004] Chinese document CN201110379737.5 discloses a treatment method for ammonia desulfurization wastewater, the steps are to neutralize the ammonia desulfurization wastewater through milk of lime to remove F-, SO4 2-, iron ions, and copper ions in the wastewater, and remove them by organic sulfur TMT-15 Mercury, copper and lead ion, flocculant polyferric chloride FeClSO4, coagulant polyacrylamide PMA form flocs and carry out clarification concentrator separation, in this document FeClSO4 is a single drug, the aqueous solution (Ca) hardness after treatment Reaching more than 2K PPM is not conducive to subsequent treatment, resulting in the inability to reuse the treated desulfurization wastewater

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