Ectopic classification leaching repair complete process of arsenic and heavy metal contaminated soil

A technology for polluted soil and heavy metals, which is applied in the restoration of polluted soil and other directions, can solve the problems such as the lack of establishment of an integrated process system for leaching and remediation of composite polluted soil, save resources, solve the problems of regeneration and recycling, and can Strong control effect

Active Publication Date: 2015-09-09
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS +1
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Problems solved by technology

[0005] At present, the research of Chinese scholars on leaching technology is mostly focused on the screening of leaching agents, the compounding of multi-element leaching agents, and the optimization of leaching conditions for full-size contaminated soil, and most of them stay in the laboratory research stage. There are few reports on the comb

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  • Ectopic classification leaching repair complete process of arsenic and heavy metal contaminated soil
  • Ectopic classification leaching repair complete process of arsenic and heavy metal contaminated soil

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Embodiment Construction

[0026] like figure 1 Shown is the process flow diagram of the present invention, and the specific embodiment of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] In this embodiment, a complete set of process for repairing arsenic and heavy metal contaminated soil by ectopic graded leaching includes the following steps:

[0028] (1) Magnetic separation: the excavated and crushed soil is put into a dry magnetic separator, and the magnetic target metals are extracted and recovered according to the difference in magnetic susceptibility. Further, the target metals extracted and recovered are zinc and nickel One or more of iron, manganese or precious metals;

[0029] (2) Dynamic screening: After magnetic separation, the remaining soil is directly sent to a multi-stage high-frequency vibrating screen, and is screened into three particle sizes: stone gravel, coarse-grained soil, and fine-grained soil. The particle...

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Abstract

The invention discloses an ectopic classification leaching repair complete process of arsenic and heavy metal contaminated soil. The repair process comprises the following steps: the contaminated soil is magnetically separated to extract and recover target metals; a nonmagnetic component is divided into three grades by a vibrating screen after being primarily crushed; stones and boulders are flushed by clear water to directly serve as building materials; thick and fine soil particles obtained through screening respectively enter second-grade leaching mixing equipment for washing; the solid-liquid separation is performed for mud generated by washing through a two-stage hydraulic cyclone device; leaching waste liquid is purified and regenerated for recycling; sludge is added with such repair materials as curing/stabilizing agents for safety treatment after being dehydrated; and after the treatment, the soil particles can be backfilled, or can serve as roadbeds, building materials and the like. Based on the characteristic of large difference of arsenic and heavy metal contents in soils with different particle sizes, the soil leaching treatment according to the particle size is performed, so that the process has such advantages as low repair cost, high treatment efficiency and saving of energy consumption, provides a new method for soil heavy metal pollution abatement, and is broad in application prospect.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to the field of remediation of soil heavy metal pollution. Background technique [0002] With the development of industry and the advancement of urbanization, human activities such as mining, electroplating, smelting, and coal combustion have caused soil heavy metal pollution to become one of the most serious and widely distributed major environmental problems today, and has attracted widespread attention from all over the world. . Heavy metal pollution in soil has the characteristics of wide pollution range, long duration of pollution concealment, and irreversibility. It can be transmitted and enriched through the food chain, which poses a great threat to human health. The restoration and treatment of heavy metal-contaminated soil is urgent. [0003] After decades of development, a variety of heavy metal-contaminated soil remediation technologies have been developed in the ...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/02
Inventor 廖晓勇阎秀兰李尤
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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