Patent
Leaching method for remediation of arsenic polluted soil by using magnetic separation
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TLDR
In this article, a leaching method for arsenic polluted soil by using magnetic separation is described, which is characterized by comprising the following steps: pre-treating polluted soil to be treated, entering leaching system, successively adding prepared leacheate and a prepared auxiliary agent, and after thorough mixing leaching, obtaining arsenic pollutants by magnetic separation through powerful magnetic separation equipment in a stirring rolling pattern.Abstract:
The invention discloses a leaching method for remediation of arsenic polluted soil by using magnetic separation. The method is characterized by comprising the following steps: pre-treating polluted soil to be treated, entering a leaching system, successively adding prepared leacheate and a prepared auxiliary agent, and after thorough mixing leaching, obtaining arsenic pollutants by magnetic separation through powerful magnetic separation equipment in a stirring rolling pattern; and performing solid-liquid separation on the remaining soil and leacheate, directly backfilling or using clean soil, after coagulation sedimentation is performed on waste leacheate, recycling the waste leacheate for preparing the leacheate, and performing follow-up treatment on precipitated waste residues and waste residues obtained after magnetic separation together. Through the adoption of the method disclosed by the invention, the problem that heavy metal, especially arsenic, pollutes the soil can be thoroughly solved, the polluted soil can be treated stably, continuously and efficiently, and the method is suitable for remediation of the arsenic polluted soil with different pollution concentrations or other composite polluted soil.read more
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References
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Magnetite-iron based composite powder, magnetite-iron based powder mixture, method for producing the same, method for remedying polluted soil, water or gases and electromagnetic wave absorber
Yukiko Ozaki,Satoshi Uenosono,Hiroki Nakamaru,Nakamura Yukiko,Shigeaki Takajo,Sawae Takajo,Shigeru Unami,Shingo Saito +7 more
TL;DR: A magnetite-iron based composite powder includes magnetite with a ratio of X-ray diffraction intensity to that of α-Fe and has an average primary particle size of about 0.1 to about 10 μm as mentioned in this paper.
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Niu Xiaojun,Wang Caihong +1 more
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TL;DR: In this article, a method for carrying out three-level remediation on heavy metal contaminated soil is proposed, which comprises the steps of breaking a contaminated paddy field, irrigating the paddy fields until a water logging layer on a soil layer is 10-15cm deep after breaking the 0.5-0.6m deep soil on the surface layer into soil lumps with sizes less than 2-3mm.
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