Repairing material for heavy metal polluted soil and application method of repairing material

A technology for repairing materials and polluted soil, applied in the field of environmental protection, can solve problems such as complicated preparation process of repairing materials, affecting soil planting function, long degradation cycle, etc., achieves broad application prospects and practical value, and is easy for large-scale industrial production and promotion application, long-term stable effect

Inactive Publication Date: 2017-06-30
INST OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Summarizing the above existing technologies, we can see that the current stabilizers for the remediation of heavy metal-contaminated soil mainly have the following problems: 1) Some remediation materials, such as cement, etc., themselves contain a variety of heavy metals with sufficient concentration to cause pollution, which is easy to cause secondary pollution
2) Some restoration materials will cause soil compaction and affect the function of soil planting
3) Some chelating agents are organic pollutants with a long degradation cycle, which will cause secondary pollution during use
4) Some repair materials have complicated preparation process and high cost

Method used

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  • Repairing material for heavy metal polluted soil and application method of repairing material
  • Repairing material for heavy metal polluted soil and application method of repairing material
  • Repairing material for heavy metal polluted soil and application method of repairing material

Examples

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Effect test

Embodiment 1

[0059] A repairing agent for heavy metal polluted soil, comprising: modified zeolite, modified sepiolite, nanometer iron powder, soda, and quicklime. Sepiolite tailings were purchased from Yuanyuan Sepiolite Company in Xiangtan County, Hunan Province. The main components of sepiolite tailings were: SiO2 66.28%, CaO 9.80%, MgO 8.74%, Fe2O3 1.81%, Al2O3 2.72%.

[0060] First prepare the modified zeolite, then prepare the modified sepiolite, then mix 7 parts of modified zeolite, 30 parts of modified sepiolite tailings, 13 parts of nano-iron powder, and 5 parts of soda Mix evenly with 45 parts of quicklime.

[0061] Wherein, the modified zeolite is prepared according to the sequence of first thermal modification and then acid modification, and the specific modification steps are as follows:

[0062] a, pretreatment, the natural zeolite is naturally dried, and sieved through a 20-mesh sieve to obtain a zeolite pretreatment product;

[0063] b, thermal modification, the zeolite af...

Embodiment 2

[0081] First prepare the modified zeolite, then prepare the modified sepiolite, then prepare 3 parts of modified zeolite, 30 parts of modified sepiolite tailings, 14 parts of nano-iron powder, and 3 parts of soda Mix evenly with 50 parts of quicklime.

[0082] Wherein, the modified zeolite is prepared according to the sequence of first thermal modification and then acid modification, and the specific modification steps are as follows:

[0083] a, pretreatment, the natural zeolite is naturally dried, and sieved through a 20-mesh sieve to obtain a zeolite pretreatment product;

[0084] b, thermal modification, the zeolite after sieving is subjected to heat treatment, the thermal modification temperature is 450°C, the thermal modification is 3h, and put into a desiccator to cool;

[0085] c, Acid modification, adding a concentration of 0.5mol / L hydrochloric acid solution to the above-mentioned cooled zeolite, the solid-to-liquid ratio is 1g: 5mL, soaking and stirring at room tem...

Embodiment 3

[0094] Prepare modified zeolite first, then prepare modified sepiolite, then prepare 6 parts of modified zeolite, 35 parts of modified sepiolite tailings, 8 parts of nano-iron powder, and 3 parts of soda Mix evenly with 48 parts of quicklime.

[0095] Wherein, the modified zeolite is prepared according to the sequence of first thermal modification and then acid modification, and the specific modification steps are as follows:

[0096] a, pretreatment, the natural zeolite is naturally dried, and sieved through a 20-mesh sieve to obtain a zeolite pretreatment product;

[0097] b, thermal modification, the zeolite after sieving is subjected to heat treatment, the thermal modification temperature is 500°C, the thermal modification is 2h, and put into a desiccator to cool;

[0098] c, Acid modification, add a concentration of 0.5mol / L nitric acid solution to the above cooled zeolite, the solid-to-liquid ratio is 1g: 5mL, soak and stir at room temperature for 10h, supplemented with...

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Abstract

The invention provides a repairing material for heavy metal polluted soil. The repairing material comprises, by mass, 1-8 parts of modified zeolite, 10-35 parts of modified sepiolite tailings, 10-20 parts of nano iron powder, 1-5 parts of sodium thiosulfate and 45-60 parts of quick lime. Meanwhile, the invention further provides a preparation method and application method of the repairing material. The zeolite and the sepiolite tailings are fully developed and used, the characteristics that the raw materials are cheap and easy to obtain, the preparation method is simple, control is easy, and the prepared soil heavy mental repairing material is good in effect and long in stabilization time are achieved, large-scale industrial production, application and popularization of the obtained repairing material are easy, and the repairing material has wide application prospects and practical value.

Description

technical field [0001] The invention relates to the remediation of heavy metal polluted soil in the field of environmental protection. Specifically, it relates to the preparation and application method of a repair material specially used for heavy metal-contaminated soil. Background technique [0002] The situation of heavy metal pollution in soil in my country is serious, which has posed a serious threat to food safety, modern agricultural ecological environment safety and sustainable development of social economy. Soil remediation has become the most urgent problem to be solved in the ecological environment of our country. [0003] At present, the methods of remediating heavy metal-contaminated soil are mainly divided into two ways: 1) Change the existing form of heavy metals in polluted soil to transform them from active state to stable state, so as to reduce the mobility and bioavailability in the environment , weaken its toxicity to plants and animals; 2) remove heavy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
CPCB09C1/00B09C2101/00
Inventor 王新宇陈明张佳文刘冠男李小赛余国强
Owner INST OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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