Remediating chemical for treating heavy-metal polluted soil and preparing method and application thereof

A technology for repairing medicaments and polluted soil, which is applied in the fields of environmental protection and material science. It can solve the problem of single repairing effect of stabilizers, achieve good stabilization effect, improve adsorption capacity, and maximize adsorption performance.

Inactive Publication Date: 2019-06-28
HUNAN QUANZHIYUAN ENVIRONMENTAL PROTECTION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problem that the stabilizer has a single effect on soil remediation, the present inve

Method used

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  • Remediating chemical for treating heavy-metal polluted soil and preparing method and application thereof
  • Remediating chemical for treating heavy-metal polluted soil and preparing method and application thereof
  • Remediating chemical for treating heavy-metal polluted soil and preparing method and application thereof

Examples

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preparation example Construction

[0022] Preparation of modified biochar: Soak 5g of biochar in 0.5mol / L NaOH solution, heat to 200°C, keep for 2h, after cooling, wash until the pH is neutral.

[0023] It should be noted that in-situ remediation in this specific embodiment refers to on-site remediation of contaminated soil, and ex-situ remediation refers to excavating polluted soil from the polluted location and remediating it within the scope of the original site. Technology for remediation within or after transportation. The sepiolite used in this specific embodiment has a particle size of ≤200 mesh and a sedimentation value of ≥850.

Embodiment 1

[0025] In the present embodiment, the remediation agent for processing heavy metal-contaminated soil includes the following components in parts by weight: 40 parts of hexathioguanidine formate-modified biochar composite stabilizer, 30 parts of soluble phosphate , 30 parts of sepiolite powder, an inorganic mineral adsorption material; wherein, 30 parts of soluble phosphates include 15 parts of calcium dihydrogen phosphate and 15 parts of sodium phosphate.

[0026] The restorative agent in this example is prepared by the following steps: mix the above components to obtain a mixture, mix the mixture with water at a mass ratio of 5:100, and stir and mix evenly to make a slurry-like repair agent.

[0027] The present embodiment also includes the application of remediation agent in remediation soil, specifically as follows:

[0028] The slurry-like restoration agent is used to carry out in-situ restoration treatment on lead, cadmium and mercury contaminated soil to be repaired, and ...

Embodiment 2

[0041] In the present embodiment, the remediation agent for processing heavy metal-contaminated soil includes the following components in parts by weight: 30 parts of hexathioguanidine formate-modified biochar composite stabilizer, 35 parts of soluble phosphate , wherein 20 parts of calcium dihydrogen phosphate, 15 parts of calcium phosphate, and 35 parts of sepiolite powder, an inorganic mineral adsorption material; wherein, 35 parts of soluble phosphates include 20 parts of calcium dihydrogen phosphate and 15 parts of calcium phosphate.

[0042] The restorative agent in the embodiment is prepared by the following steps: mix the above components to obtain a mixture, mix the mixture with water at a mass ratio of 10:100, and stir and mix evenly to make a slurry-like repair agent.

[0043] This embodiment also includes the application of repairing agents in repairing soil, specifically as follows: the lead, cadmium, and mercury-contaminated soil to be repaired is subjected to ex-...

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Abstract

The invention relates to a remediating chemical for treating heavy-metal polluted soil and a preparing method and application thereof. The remediating chemical is prepared from, by weight, 10-50 partsof a thio-guanidyl formate-modified biochar compound stabilizer, 10-40 parts of soluble phosphate and 10-30 parts of sepiolite powder, wherein the thio-guanidyl formate-modified biochar compound stabilizer is prepared by carrying out a cross-linking reaction between a hexa-thio-guanidyl formate solution and modified biochar. The remediating chemical has a great stabilizing effect on various heavymetals in the soil. Besides, the invention provides the preparing method of the remediating chemical and the application of the remediating chemical in remediating the soil.

Description

technical field [0001] The present invention relates to the fields of environmental protection and material science, in particular to a remediation agent for treating heavy metal polluted soil, its preparation method and application. Background technique [0002] Among the problems of soil environmental pollution, heavy metal pollution is particularly prominent. According to the survey, the land polluted by heavy metals in my country accounts for about 64.8% of the total area of ​​polluted land, of which the heavily polluted area accounts for about 8.4%, the moderately polluted area accounts for 9.7%, and the lightly polluted area accounts for 46.7%. In heavy metal polluted farmland, Cd and Hg are the most serious, followed by Pb, As, Cr and Cu. According to statistics, the area of ​​land polluted by Cd in my country is about 14,000 hectares. The exceeding standard rates of Pb in vegetables, fruits, meat and livestock products in the suburbs of large and medium-sized citie...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
Inventor 刘霞马涛施盘晴曹艳华邹蓉叶俊李浩莫湘陶
Owner HUNAN QUANZHIYUAN ENVIRONMENTAL PROTECTION SCI & TECH
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