Method for preparing soil heavy metal solidification material by using oil shale semi-coke

A technology for oil shale semi-coke and solidified materials, applied in the field of waste resource reuse, can solve the problems of low added value, limited utilization, environmental pollution, etc., and achieve good ecological and economic benefits.
CN109603752AActive Publication Date: 2019-04-12LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Publication Date
2019-04-12

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Abstract

The invention discloses a method for preparing a soil heavy metal solidification material by using oil shale semi-coke, which comprises the following steps of: crushing oil shale semi-coke, then carrying out wet grinding, sieving through 200 meshes, adding acid liquor for acid activation treatment, carrying out pressure filtration and dehydration, and then sending the product into a rotary kiln byusing a double screw, calcining in nitrogen atmosphere, pulverizing, and sieving to obtain the final product. According to the invention, the adsorption sites of heavy metal ions can be increased andthe adsorption capacity can be improved by activating mineral silica chemical bonds in the semi-coke through acid treatment; the micro-pore and mesoporous structures in the semi-coke are activated through calcination treatment; meanwhile, organic components are converted into active carbon, and the adsorption performance of heavy metal ions is further improved. The method not only achieves resource utilization of the oil shale semi-coke waste residue, but also can be used for passivating heavy metals in soil, and has good ecological benefit and economic benefit.
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Description

technical field

[0001] The invention relates to a method for preparing soil heavy metal solidified material, in particular to a method for preparing soil heavy metal solidified material by using oil shale semi-coke, which belongs to the field of waste resource reuse. technical background

[0002] Soil heavy metal pollution has become a global environmental pollution problem. At present, the common heavy metal contaminated soil remediation technologies mainly include physical remediation, chemical remediation, biological remediation and agricultural regulation technology. Among them, chemical passivation / immobilization technology is widely used because it can quickly and significantly reduce the bioavailability and toxicity of heavy metals. Passivation technology mainly relies on passivating agents to reduce the mobility and bioavailability of heavy metals in soil, and make them exist in soil in a more stable form. At present, materials that can be used as heavy metal passi...

Claims

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