Method for repairing mine soil contaminated by heavy metals

A soil remediation and heavy metal technology, applied in the field of soil remediation, can solve problems such as adverse effects on human health in the growing environment, reduce microbial activity and stability, disrupt plant metabolism, etc. effect of effect

Inactive Publication Date: 2019-08-02
HEBEI NORMAL UNIV FOR NATTIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The physical and chemical properties of most heavy metals are relatively stable and have weak mobility. They are easily adsorbed by particulate matter in the soil and cannot be degraded by microorganisms. Instead, heavy metals are completely eliminated from the environment. When heavy metals are high, they will be directly accumulated in plants. In the food chain, it has extremely adverse effects on soil conditions, crop growth environment, and human health. In addition, when accumulated to a certain extent, heavy metals will also have a considerable toxic effect on plants, disrupting the process of plant metabolism. normal growth and development, and even a large area of ​​death, which greatly reduces the yield of crops
Heavy metal pollution can also affect the growth of microorganisms in the soil, reducing the activity and stability of microorganisms in the soil

Method used

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  • Method for repairing mine soil contaminated by heavy metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A mine soil remediation method polluted by heavy metals comprises the following steps:

[0025] (1) Add montmorillonite to a buffer solution with a pH value of 8, and after ultrasonic dispersion is uniform, add sodium silicate to it, react for 3 hours, filter to obtain a precipitate, and dry the precipitate to obtain a modified montmorillonite Soil, wherein, the buffer solution is made of 0.1mol / L disodium hydrogen phosphate and 0.1mol / L sodium dihydrogen phosphate according to the volume ratio of 1:1, and the pH value is adjusted to 8 by using sodium hydroxide solution. , the adding mass ratio of montmorillonite and sodium silicate is 10:1;

[0026] (2) In parts by weight, add 24 parts of ferric chloride hexahydrate to 250 parts of deionized water, after the ultrasonic dispersion is uniform, nitrogen gas is introduced under mechanical stirring for 15 minutes to remove the oxygen in the solution after ultrasonic dispersion, and continue to add 35 parts of ammonia water...

Embodiment 2

[0029] A mine soil remediation method polluted by heavy metals comprises the following steps:

[0030] (1) Add montmorillonite to a buffer solution with a pH value of 8, and after ultrasonic dispersion is uniform, add sodium silicate to it, react for 3.5 hours, filter to obtain a precipitate, and dry the precipitate to obtain a modified montmorillonite Soil, wherein, the buffer solution is made of 0.1mol / L disodium hydrogen phosphate and 0.1mol / L sodium dihydrogen phosphate according to the volume ratio of 1:1, and the pH value is adjusted to 8 by using sodium hydroxide solution. , the adding mass ratio of montmorillonite and sodium silicate is 10:2;

[0031] (2) In parts by weight, add 26 parts of ferric chloride hexahydrate to 280 parts of deionized water, after the ultrasonic dispersion is uniform, nitrogen gas is introduced under mechanical stirring for 15 minutes to remove the oxygen in the solution after ultrasonic dispersion, and continue to add 38 parts of ammonia wat...

Embodiment 3

[0034] A mine soil remediation method polluted by heavy metals comprises the following steps:

[0035](1) Add montmorillonite to a buffer solution with a pH value of 9, and after ultrasonic dispersion is uniform, add sodium silicate to it, react for 4 hours, filter to obtain a precipitate, and dry the precipitate to obtain a modified montmorillonite Soil, wherein, the buffer solution is made of 0.1mol / L disodium hydrogen phosphate and 0.1mol / L sodium dihydrogen phosphate according to the volume ratio of 1:1, and its pH value is adjusted to 9 by using sodium hydroxide solution. , the adding mass ratio of montmorillonite and sodium silicate is 10:3;

[0036] (2) In parts by weight, 28 parts of ferric chloride hexahydrate were added to 300 parts of deionized water, and after the ultrasonic dispersion was uniform, nitrogen gas was introduced under mechanical stirring for 15 minutes to remove the oxygen in the solution after ultrasonic dispersion, and then continue to add 40 parts...

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Abstract

The invention discloses a method for repairing mine soil contaminated by heavy metals. The method comprises the following operating steps: (1) adding montmorillonite into a buffer solution, uniformlydispersing through an ultrasonic treatment, adding sodium silicate into the mixture, filtering to obtain a precipitate, and drying the precipitate to obtain modified montmorillonite; (2) adding ferricchloride hexahydrate into ionized water, performing ultrasonic treatment, then adding ammonia water continuously, heating up, adding sodium citrate continuously, heating up and keeping warm, adding the modified montmorillonite, stirring for a reaction to obtain modified montmorillonite with magnetic properties; and (3) inserting several electrodes into the soil, then embedding the modified montmorillonite with magnetic properties around the electrodes, then electrifying the electrodes, extracting the heavy metal pollutants in the soil by an extraction well, and performing harmless treatment on the heavy metals. The method for repairing mine soil contaminated by the heavy metals, provided by the invention, has the advantages of short treatment period, high removal rate of target pollutantsand deep repairing depth.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for remediating mine soil polluted by heavy metals. Background technique [0002] As we all know, mineral resources are one of the most basic resources for human production and life. There are many kinds of heavy metal resources rich in mines, with a wide range of distribution and extremely rich reserves. Although the development of heavy metal resources in mines has created huge material wealth, but because Unreasonable mining has caused a series of serious ecological and environmental pollution problems. Mine mining will cause a variety of heavy metal pollution, and the mining, dressing, and smelting of metal mine development will discharge heavy metal elements into the environment. For example, the long-term natural oxidation and rainwater leaching of waste sulfide produced during the mining of primary sulfide deposits lead to heavy metal element...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/06
CPCB09C1/00B09C1/062
Inventor 徐兆翮刘晓光朱毓永李洁崔彬彬杨雪徐岩岩顾翰琦单梅华刘冉朱国芬陈晓宇张红彭艳芳董建新赵鑫
Owner HEBEI NORMAL UNIV FOR NATTIES
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