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Fly ash modification method used for mercury contamination in situ soil remediation, and applications

A technology for soil remediation and fly ash, applied in the field of soil remediation, can solve the problems of low activity of fly ash, long treatment time, large dosage, etc., and achieves improved adsorption and precipitation performance, good passivation, and low cost. Effect

Inactive Publication Date: 2019-04-19
长沙湘朴科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

People have done a lot of research on the control of fly ash in water heavy metal pollution, and achieved rich results. Therefore, it may be an effective method to use fly ash for in-situ remediation of mercury-contaminated soil, but the fly ash itself The activity of heavy metals is not high, and the direct use of fly ash for heavy metal passivation treatment has the disadvantages of low efficiency, long treatment time, and large dosage.

Method used

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  • Fly ash modification method used for mercury contamination in situ soil remediation, and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Acid modification: Fly ash is prepared into a slurry with a mass concentration of 8% at room temperature, and sulfuric acid with a concentration of 1mol / L and 1mol / L hydrochloric acid are added at a volume ratio of 1:1 for stirring reaction. Sulfuric acid and The addition of hydrochloric acid is 2% of fly ash quality, and stirring time is 2 hours;

[0025] (2) Water washing: filter the fly ash slurry obtained in step (1), wash with water until the pH value is 7, and filter for use;

[0026] (3) Combined modification: the washed fly ash is prepared into a slurry with a mass concentration of 15%, and potassium phosphate, which accounts for 6% of the mass of the fly ash, is added, accounting for 2% of the mass of the fly ash, and the concentration is 15% % hydrogen peroxide, account for the manganese dioxide of 0.02% of fly ash quality, fully stir, and the reaction time is 1 hour;

[0027] (4) Drying: Filter the fly ash obtained in step (3), and fully dry it in a dryi...

Embodiment 2

[0029] (1) Acid modification: Prepare fly ash into a slurry with a mass concentration of 9% at room temperature, add sulfuric acid with a concentration of 1.2mol / L and 1.2mol / L hydrochloric acid at a volume ratio of 1:1.5 for stirring reaction, The addition of sulfuric acid and hydrochloric acid is 2.5% of the fly ash quality, and the stirring time is 2.5 hours;

[0030] (2) Water washing: filter the fly ash slurry obtained in step (1), wash with water until the pH value is 7, and filter for use;

[0031] (3) Combined modification: the washed fly ash is prepared into a slurry with a concentration of 18%, and potassium phosphate, which accounts for 7% of the mass of the fly ash, is added, accounting for 3% of the mass of the fly ash, and the concentration is 20% % hydrogen peroxide, account for the manganese dioxide of 0.03% of fly ash quality, fully stir, and the reaction time is 1.5 hours;

[0032] (4) Drying: Filter the fly ash obtained in step (3), and fully dry it in a dr...

Embodiment 3

[0034] (1) Acid modification: Fly ash is prepared into a slurry with a mass concentration of 10% at room temperature, and sulfuric acid with a concentration of 1.5mol / L and 1.5mol / L hydrochloric acid are added at a volume ratio of 1:1.8 for stirring reaction. The addition of sulfuric acid and hydrochloric acid is 2.8% of fly ash quality, and stirring time is 3 hours;

[0035] (2) Water washing: filter the fly ash slurry obtained in step (1), wash with water until the pH value is 7, and filter for use;

[0036] (3) Combined modification: the washed fly ash was prepared into a slurry with a mass concentration of 22%, and potassium phosphate, which accounted for 8% of the mass of the fly ash, was added, accounting for 3.5% of the mass of the fly ash, with a concentration of 25% hydrogen peroxide, account for 0.04% manganese dioxide of fly ash quality, fully stir, and the reaction time is 2 hours;

[0037] (4) Drying: Filter the fly ash obtained in step (3), and fully dry it in a...

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Abstract

The invention discloses a fly ash modification method used for mercury contamination in situ soil remediation, and applications. The method includes the following steps: (1) the step of acid modification, namely the step of preparing fly ash into slurry with a certain mass concentration under normal temperature, and adding sulfuric acid and hydrochloric acid with a certain concentration to performmodification; (2) the step of washing, namely the step of filtering the fly ash slurry obtained by the step (1), performing washing with clear water until a pH value is 7, and performing filtering for later use; (3) the step of combined modification, namely the step of preparing the washed fly ash into the slurry with a certain mass concentration, and adding phosphate, hydrogen peroxide and manganese dioxide to perform full stirring; and (4) the step of drying, namely the step of filtering the fly ash obtained by the step (3), and obtaining modified fly ash through drying. Mercury can be passivated by adding the modified fly ash into mercury-contaminated soil, so that the purpose of soil remediation can be achieved. As the fly ash can be adopted as a main material of mercury-contaminatedsoil remediation, the method can have advantages of being wide in raw material source and low in cost, and other heavy metal can be passivated as well.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a fly ash modification method and application for in-situ soil remediation of mercury pollution. Background technique [0002] The current principles of mercury soil remediation include: reducing the content of mercury, changing the form of mercury in the soil, reducing the toxicity, mobility or bioavailability of pollutants. In the remediation and treatment of mercury-contaminated soil, commonly used technologies include heat treatment, leaching remediation, electrodynamic remediation, phytoremediation, genetic engineering, in-situ solidification remediation, and nanometer remediation. Although heat treatment, leaching restoration, and electric restoration have the advantages of fast, convenient, and good treatment effects, they have high investment costs and are suitable for ex-situ restoration with serious soil pollution. At present, in the in-situ remediation techno...

Claims

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Application Information

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IPC IPC(8): C09K17/08B09C1/08C09K101/00
CPCC09K17/08B09C1/08C09K2101/00
Inventor 曹兴
Owner 长沙湘朴科技有限公司
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