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Heavy metal contaminated soil remediation agent and preparation method thereof

A technology for polluted soil and remediation agent is applied in the field of heavy metal contaminated soil remediation agent and its preparation, and achieves the effects of improving aggregate structure, wide pH application range and increasing soil pH.

Inactive Publication Date: 2020-05-12
湖南本农环境科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for a large area of ​​polluted farmland, issues such as remediation costs and economic benefits must be considered

Method used

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  • Heavy metal contaminated soil remediation agent and preparation method thereof

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Effect test

Embodiment 1

[0024] A heavy metal contaminated soil remediation agent, comprising the following raw materials in parts by weight: 30 parts of modified fly ash, 20 parts of modified kaolinite, 10 parts of oxidized nano-carbon black, 10 parts of biochemical fulvic acid, 3 parts of sodium thiosulfate Parts, 5 parts of microbial inoculants.

[0025] A preparation method for a heavy metal contaminated soil remediation agent, comprising the steps of:

[0026] (1) Preparation of modified fly ash: mix fly ash and sodium hydroxide at a mass ratio of 1:1, roast at 150°C for 2 hours, wash until neutral, dry and grind the obtained product;

[0027] (2) Preparation of modified kaolinite: a, pulverizing kaolinite, crossing 200 mesh sieves, adding mass percentage composition successively is that 5% potassium permanganate solution, 40% nitric acid solution are oxidized under 90 ℃ of conditions, Wash until neutral and dry; b. Add methanol to the oxidized kaolinite at a solid-to-liquid ratio of 10:1, stir ...

Embodiment 2

[0031] A heavy metal polluted soil remediation agent, comprising the following raw materials in parts by weight: 40 parts of modified fly ash, 25 parts of modified kaolinite, 15 parts of oxidized nano carbon black, 10 parts of biochemical fulvic acid, 5 parts of sodium thiosulfate Parts, 5 parts of microbial inoculants.

[0032] A preparation method for a heavy metal contaminated soil remediation agent, comprising the steps of:

[0033] (1) Preparation of modified fly ash: mix fly ash and sodium hydroxide at a mass ratio of 1:2, roast at 180°C for 1.5h, wash until neutral, dry and grind;

[0034] (2) Preparation of modified kaolinite: a, pulverizing kaolinite, crossing 200 mesh sieves, adding mass percentage composition successively is that 8% potassium permanganate solution, 35% nitric acid solution are oxidized under 90 ℃ of conditions, Wash until neutral and dry; b. Add methanol to the oxidized kaolinite at a solid-to-liquid ratio of 10:1, stir for reaction, add ethylenedi...

Embodiment 3

[0038] A heavy metal contaminated soil restoration agent, comprising the following raw materials in parts by weight: 50 parts of modified fly ash, 30 parts of modified kaolinite, 20 parts of oxidized nano-carbon black, 15 parts of biochemical fulvic acid, 8 parts of sodium thiosulfate Parts, 10 parts of microbial inoculum agent.

[0039] A preparation method for a heavy metal contaminated soil remediation agent, comprising the steps of:

[0040] (1) Preparation of modified fly ash: mix fly ash and sodium hydroxide at a mass ratio of 1:2, roast at 220°C for 1 hour, wash until neutral, dry and grind the obtained product;

[0041](2) Preparation of modified kaolinite: a, pulverizing kaolinite, crossing 200 mesh sieves, adding mass percentage composition successively is that 10% potassium permanganate solution, 30% nitric acid solution are oxidized under 90 ℃ of conditions, Wash until neutral and dry; b. Add methanol to the oxidized kaolinite at a solid-to-liquid ratio of 10:1, s...

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PUM

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Abstract

The invention belongs to the technical field of soil remediation agents, and discloses a heavy metal contaminated soil remediation agent. The heavy metal contaminated soil remediation agent comprises,by weight, 30-50 parts of modified fly ash, 20-30 parts of modified kaolinite, 10-20 parts of oxidized nanometer carbon black, 10-15 parts of biochemical fulvic acid, 3-8 parts of sodium thiosulfateand 5-10 parts of a microbial agent. The invention also discloses a preparation method of the heavy metal contaminated soil remediation agent. The preparation method comprises the following steps: (1)uniformly mixing weighed modified fly ash, modified kaolinite, oxidized nanometer carbon black, biochemical fulvic acid and sodium thiosulfate, feeding the obtained mixture into a granulator, addinga proper amount of water vapor, granulating, and drying for later use; and (2) adding the microbial agent into obtained particles, uniformly mixing, feeding the obtained mixture into a granulator, adding a proper amount of water vapor, granulating, and drying to obtain the soil remediation agent. An inorganic passivator and microorganisms are combined for use, and heavy metal ions are rapidly andefficiently fixed through the inorganic passivator; and the microbial agent is added, so that the leaching concentration of heavy metals is reduced, and the heavy metal contaminated soil is improved.

Description

technical field [0001] The invention belongs to the technical field of soil remediation agents, and relates to a heavy metal contaminated soil remediation agent and a preparation method thereof. Background technique [0002] Soil is an important part of the human environment, an indispensable and non-renewable natural resource, and an important basis for the survival of all living things. With the development of industrial and agricultural production, the problem of soil environmental pollution is becoming more and more serious, especially the problem of soil heavy metal pollution, which not only affects the yield and quality of crops and aquatic products, but may also endanger human life and health through the food chain. Soil heavy metal pollution mainly refers to elements with significant biological toxicity such as Pb, Cd, Hg, and Cr, and also includes heavy metals such as Zn, Cu, Co, Ni, and Sn with certain toxicity, which are concealed, long-term, and irreversible. Po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K101/00C09K109/00
CPCC09K17/40C09K2101/00C09K2109/00
Inventor 刘刚韩建均杜昕徐珺
Owner 湖南本农环境科技有限公司
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