A combined electrodynamic and sedimentation method for remediating heavy metal pollutants in tailings

Abstract

The invention relates to a tailing heavy metal pollutant electrokinetic and precipitated combined remediation method and belongs to the technical field of tailing heavy metal remediation environmental protection. According to the method, heavy metal pollutant electrokinetic remediation is conducted in a remediation tank; the middle of the remediation tank is provided with a tailing heavy metal remediation groove; the pH of cathode liquor or anode liquor is maintained to be 6-7 through a replenisher; cathode and anode overflow liquor is collected; alkali liquor is added into the obtained cathode overflow liquor, and the pH is controlled to be 7-8; sulfide is added, the liquor is subjected to stirring, standing and filtering to obtain a purified solution, the purified solution is used as the anode liquor replenisher in the remediation process, and the obtained anode overflow liquor is used as cathode liquor replenisher until electrokinetic remediation is completed; and after electrokinetic remediation is completed, the cathode liquor and the overflow liquor are mixed to obtain a mixed solution, alkali liquor is added into the mixed solution to enable the pH of the mixed solution to be controlled within 7-8, sulfide is added, the solutions is subjected to precipitating, stirring, standing and filtering, and finally the solution becomes the purified solution. Through the method, cathode liquor heavy metal secondary pollutants after electrokinetic remediation can be effectively purified.

Description

technical field [0001] The invention relates to a method for jointly repairing tailings heavy metal pollutants by electrodynamics and sedimentation, and belongs to the technical field of tailings heavy metal restoration and environmental protection. Background technique [0002] With the continuous development and utilization of mineral resources, a large number of tailings and waste residues are dumped in the ecological environment. The heavy metal elements contained in the tailings will cause great harm to the surrounding soil, rivers, and agricultural production. Tailings have become important heavy metals. source of pollution. For this reason, the restoration of heavy metals in tailings has become an important issue. [0003] There are many heavy metal repair methods, including plant method, stabilization method, physical method, etc. Among them, the electric repair technology has many advantages such as strong timeliness, good effect, and thorough removal. As the pH i...

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Problems solved by technology

[0003] There are many heavy metal repair methods, including plant method, stabilization method, physical method, etc. Among them, the electric repair technology has many advantages such as strong timeliness, good effect, and thorough removal. As the pH increases, the pH of the anolyte solution decreases, and the pH increase of the catholyte will cause heavy metal ions to precipitate in advance, and the repair index will deteriorate. Controlling the cathode pH becomes an important factor in improving the repair index. The overflow produced by repair contains heavy metal ions. At the same time, the electric After restoration, most of the heavy metal ions still remain in the catholyte, and the catholyte and overflow liquid become secondary pollution sources, and the application of purification treatment has not been reported.

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