Remediation agent for cadmium contaminated soil and soil remediation method

A technology of cadmium-contaminated soil and remediation agent, which is applied in the restoration of contaminated soil, soil conditioning materials, chemical instruments and methods, etc., to achieve the effect of uniformity, strong ion exchange capacity and stability

Pending Publication Date: 2018-11-13
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The primary purpose of the present invention is to provide a remediation agent for cadmium-contaminated soil and a method for repairing soil using the remediation agent for the technical problems existing in the remediation of existing cadmium-contaminated soil. The preparation process of the agent is simple to operate, and the properties of the prepared product are uniform and stable

Method used

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  • Remediation agent for cadmium contaminated soil and soil remediation method
  • Remediation agent for cadmium contaminated soil and soil remediation method
  • Remediation agent for cadmium contaminated soil and soil remediation method

Examples

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Effect test

Embodiment 1

[0081] The preparation of embodiment 1 soil remediation agent

[0082] 1. Prepare raw materials according to the following ratio (×kg)

[0083]

[0084] 2. In an environment where the relative humidity is maintained at 30% (usually ≤ 30%, preferably 15-30%), the raw materials magnesium oxide, sepiolite, and calcium-based bentonite are respectively pulverized and sieved by a pulverizer to obtain Magnesium oxide powder, sepiolite powder, bentonite powder with a particle size of ≤100 mesh (usually ≤60 mesh, preferably 60-100 mesh);

[0085] Magnesium oxide, sepiolite and calcium-based bentonite all have strong hygroscopicity, and after absorbing water, they will rapidly expand, agglomerate, harden and lose their effect.

[0086] In the embodiment of the present invention, the particle size of magnesium oxide powder, sepiolite powder, and bentonite powder is 100 mesh as an example for illustration, and other powders ≤ 60 mesh are applicable to the present invention.

[0087] ...

Embodiment 2

[0103] The preparation of embodiment 2 soil remediation agent

[0104] 1. Prepare raw materials according to the following ratio (×kg)

[0105]

[0106]

[0107] 2. In an environment where the relative humidity is maintained at 20% (usually ≤ 30%, preferably 15-30%), the raw materials magnesium oxide, sepiolite, and calcium-based bentonite are respectively pulverized and sieved by a pulverizer to obtain Magnesium oxide powder, sepiolite powder, bentonite powder with particle size ≤ 80 mesh (usually ≤ 60 mesh, preferably 60-100 mesh);

[0108] 3. Mix the crushed magnesia powder, sepiolite powder, and bentonite powder with particle size ≤ 80 mesh evenly to make a magnesia-sepiolite-bentonite mixture, wherein the weight of magnesia, sepiolite, and calcium-based bentonite The ratio is 2:4:10 (ie 1:2:5);

[0109] 4) The zeolite is pulverized and sieved by a pulverizer to obtain a zeolite powder with a particle size of 10-20 mesh;

[0110] 5) Mix the magnesia-sepiolite-bent...

Embodiment 3

[0112] The preparation of embodiment 3 soil remediation agent

[0113] 1. Prepare raw materials according to the following ratio (×kg)

[0114]

[0115] 2. In an environment where the relative humidity is maintained at 25% (usually ≤ 30%, preferably 15-30%), the raw materials magnesium oxide, sepiolite, and calcium-based bentonite are respectively pulverized and sieved by a pulverizer to obtain Magnesium oxide powder, sepiolite powder, bentonite powder with a particle size of ≤100 mesh (usually ≤60 mesh, preferably 60-100 mesh);

[0116] 3. Mix the crushed magnesia powder, sepiolite powder, and bentonite powder with a particle size of ≤100 mesh evenly to make a magnesia-sepiolite-bentonite mixture, wherein the weight of magnesia, sepiolite, and calcium-based bentonite The ratio is 4:6:10 (ie 2:3:5);

[0117] 4) The zeolite is pulverized and sieved by a pulverizer to obtain a zeolite powder with a particle size of 10-20 mesh;

[0118]5) Mix the magnesia-sepiolite-bentonit...

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Abstract

The invention provides a remediation agent for cadmium contaminated soil and a soil remediation method. The remediation agent comprises magnesium oxide, sepiolite, magnesium calcium-based bentonite, and zeolite, and can be used for in-situ remediation performed on the cadmium contaminated soil. The remediation agent takes magnesium oxide as a main passivator component for cadmium, additional threeclay minerals are added to serve as adsorbent and stabilizer components to form a mixture, after the remediation agent and the contaminated soil are uniformly mixed, the initial water content is adjusted to a saturated soil water content, and the remediation agent is left to stand for 3 to 10 days, so that normal plant seeding can be performed. The remediation agent reduces the bioavailability and transferability of heavy metal elements in the cadmium contaminated soil, improves soil self-purification capacity, and improves the soil fertility status, thereby guaranteeing the high quality, high yield and safety of agricultural products, ensures that the soil remediation is short in reaction period, good in effect, long in duration and wide in application range, and cannot cause secondary pollution.

Description

technical field [0001] The invention relates to a restoration agent for repairing polluted soil and a preparation method thereof, a method for repairing soil by using the restoration agent, in particular to a restoration agent for repairing soil polluted by heavy metals and a preparation method thereof, and a method for repairing polluted soil by using the restoration agent The method belongs to the technical field of soil improvement. Background technique [0002] On April 17, 2014, the Ministry of Environmental Protection and the Ministry of Land and Resources jointly issued the "National Soil Pollution Census Bulletin", which showed that my country has a large area of ​​heavy metal-enriched soil, which seriously threatens my country's food safety production and people's health. Cadmium , Mercury, arsenic, copper, lead, chromium, zinc, nickel 8 kinds of inorganic pollutants point exceeding standard rate accounted for 7.0%, 1.6%, 2.7%, 2.1%, 1.5% of the total point of land p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08B09C1/08C09K101/00C09K109/00
CPCB09C1/08B09C2101/00C09K17/08C09K2101/00C09K2109/00
Inventor 索琳娜安志装赵同科李虎群张艳刚郑云霞芦宇晨
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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