Method for recovering valuable substances and synergistically removing pollutants in combined polluted soil

By integrating the process of flotation to recover valuable substances, cyclone separation to remove fine particles, cavitation stripping and leaching to remove heavy metals and stabilization treatment, the problem of low resource utilization and low remediation efficiency in complex polluted soils has been solved, achieving efficient and environmentally friendly soil remediation.

CN122230875APending Publication Date: 2026-06-19CHANGCHUN GOLD RES INST
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Patent Information

Application Number
CN202610715048.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-22
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing remediation methods for treating complex contaminated soils have low resource utilization rates, low remediation efficiency, and high costs. They also fail to effectively recover valuable substances such as gold and silver, neglect the treatment of soils with high concentrations of fine particles, resulting in large remediation volumes, low efficiency, and the risk of secondary pollution.

Method used

An integrated process is adopted, including pretreatment, flotation, cyclone separation, cavitation stripping and washing, and stabilization and solidification. Valuable substances are recovered by flotation, fine particles are removed by cyclone separation, heavy metals are removed by cavitation stripping and washing, and stabilization treatment is carried out to form an integrated process.

Benefits of technology

It achieves efficient recycling of valuable substances and harmless removal of heavy metals, reduces the amount of remediation required, improves remediation efficiency, avoids secondary pollution, and balances environmental and economic benefits.

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Abstract

The invention provides a method for recycling valuable substances and synergistically removing pollutants in combined polluted soil, and belongs to the field of soil pollution treatment and resource utilization. The combined polluted soil is pretreated, and slag blocks with the particle size larger than 2 cm are removed; the pretreated soil is subjected to slurry mixing and then subjected to flotation, valuable substances are collected, the soil slurry obtained after flotation is subjected to separation treatment, and micro-fine particle soil with the particle size smaller than or equal to 20 micrometers is removed; leacheate is added into the soil slurry with the micro-fine particles removed for cavitation stripping leaching and screening, and soil with different particle sizes and leaching underflow are obtained; carrying out filter pressing on the leaching underflow to obtain filter pressing residues and clarified liquor; a stabilizing agent is added into the filter pressing residues for solidification and stabilization treatment; and discharging the washed soil after the soil reaches the standard. According to the method, valuable substances such as gold and silver in the soil are efficiently recycled through the flotation technology, resource utilization is achieved, harmless removal of heavy metal is achieved through the subsequent removing, leaching and curing steps, and both environmental benefits and economic benefits are taken into account.
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