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Heavy metal contaminated soil remediation material and preparation method and application method thereof

A technology for remediation materials and polluted soils, applied in the field of remediation materials for heavy metal contaminated soils and their preparation, can solve problems such as poor separation effect between remediation materials and soil, increase soil pollution, increase organic matter, etc. Simple, strong adsorption and fixation effect

Active Publication Date: 2020-08-25
四川时代绿洲环境修复股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above-mentioned problems existing in the prior art, the present invention provides a heavy metal soil restoration material and its preparation method and application method. The restoration material can effectively solve the risk of artificially increasing organic matter and increasing soil pollution in existing magnetic soil restoration materials. , the separation effect between the restoration material and the soil is poor, and it is easy to cause problems such as secondary pollution

Method used

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  • Heavy metal contaminated soil remediation material and preparation method and application method thereof
  • Heavy metal contaminated soil remediation material and preparation method and application method thereof
  • Heavy metal contaminated soil remediation material and preparation method and application method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0048] A kind of heavy metal polluted soil remediation material, its preparation method comprises the following steps:

[0049] (1) crushing and ball milling the ilmenite tailings to obtain 100% ilmenite powder of -325 mesh;

[0050] (2) crushing and ball milling the carbon black to obtain 100% carbon black powder of -325 mesh;

[0051] (3) 70 parts of ilmenite powder in the step (1) are mixed with 30 parts of the carbon black powder in the step (2) to obtain a compound, and adding 20 parts of mass concentration to the compound is 30% silica sol and 10 parts of γ-mercaptopropyltrimethoxysilane modification solution with a mass concentration of 15%, stir evenly, and obtain a columnar repair material precursor with an average diameter of φ1mm by extrusion;

[0052] (4) Heat the repair material precursor in step (3) to 75°C at a heating rate of 3°C / min in a vacuum drying oven, keep it warm for 1.5h, and then raise the temperature to 105°C at a rate of 7°C / min , heat preservatio...

Embodiment 2

[0054] A kind of heavy metal polluted soil remediation material, its preparation method comprises the following steps:

[0055] (1) crushing and ball milling the ilmenite tailings to obtain 100% ilmenite powder of -325 mesh;

[0056] (2) crushing and ball milling the carbon black to obtain 100% carbon black powder of -325 mesh;

[0057] (3) 60 parts of ilmenite powder in the step (1) are mixed with 30 parts of the carbon black powder in the step (2) to obtain a mixture, and adding 10 parts of mass concentration to the mixture is 40% silica sol and 8 parts of N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane modified liquids with a mass concentration of 20%, stir evenly, and obtain an average particle diameter of φ3mm by disc granulation. Spherical repair material precursor;

[0058] (4) Heat the repair material precursor in step (3) to 70°C at a heating rate of 3°C / min in a vacuum drying oven, keep it warm for 1.5 hours, and then raise the temperature to 105°C at a rate of...

Embodiment 3

[0060] A kind of heavy metal polluted soil remediation material, its preparation method comprises the following steps:

[0061] (1) crushing and ball milling the ilmenite tailings to obtain 100% ilmenite powder of -325 mesh;

[0062] (2) crushing and ball milling the carbon black to obtain 100% carbon black powder of -325 mesh;

[0063] (3) 80 parts of ilmenite powder in the step (1) are mixed with 50 parts of the carbon black powder in the step (2) to obtain a mixture, and adding 10 parts of mass concentration to the mixture is 35% silica sol and 5 parts of γ-aminopropyltriethoxysilane modification solution with a mass concentration of 25%, stir evenly, and obtain a φ2mm spherical repair material precursor by disc granulation;

[0064] (4) Heat the repair material precursor in step (3) to 80°C at a heating rate of 2°C / min in a vacuum drying oven, keep it warm for 1 hour, and then raise the temperature to 110°C at a rate of 10°C / min. Insulated for 1h, cooled and prepared.

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Abstract

The invention provides a heavy metal contaminated soil remediation material as well as a preparation method and a use method thereof. The preparation method comprises the following steps: crushing andgrinding ilmenite tailings to obtain ilmenite powder; crushing and grinding carbon black to obtain carbon black powder; uniformly mixing the ilmenite powder and the carbon black powder to obtain a mixture, and adding a binder and a modification liquid into the mixture to prepare a remediation material precursor; heating the remediation material precursor to 60-80 DEG C at the speed of 2-5 DEG C / min in a vacuum state, conducting heat preservation for 1-2 h, then heating the remediation material precursor to 100-120 DEG C at the speed of 5-10 DEG C / min, conducting heat preservation for 1-3 h, and conducting cooling to obtain the remediation material. No organic matter is added into the prepared remediation material, the risk of artificial increase of soil pollution can be avoided, the remediation material has high specific magnetism and can be fully separated from soil in a magnetic separation mode, and secondary pollution caused by remediation material residues is avoided.

Description

technical field [0001] The invention belongs to the technical field of environmental protection materials, and in particular relates to a repair material for heavy metal polluted soil, a preparation method and a use method thereof. Background technique [0002] Soil heavy metal pollution refers to the phenomenon that human activities lead to the migration of heavy metals into the soil in a specific form, causing the content of heavy metals in the soil to be significantly higher than the background value, and causing ecological environmental pollution. The pollution sources mainly involve mining development, smelting, electroplating, chemical industry, etc. The three wastes from industrial production and the irrational use of irrigation, pesticides, and chemical fertilizers, while atmospheric deposition and rainfall may also lead to excessive heavy metal pollution in the soil in some industrial areas. With the rapid development of industry and agriculture, the problem of soil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/00B09C1/08
CPCB09C1/00B09C1/08B09C2101/00C09K17/40
Inventor 陈广邓宇森熊平
Owner 四川时代绿洲环境修复股份有限公司
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