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Repair agent for fluorine polluted soil and repair method for fluorine polluted soil

A technology of polluted soil and remediation methods, which is applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc. Harmful, activity-reducing effects

Active Publication Date: 2016-03-23
GUANGZHOU HUANFA ENVIRONMENTAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on soil fluoride pollution control is limited, and there is no very clear and feasible technical solution

Method used

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  • Repair agent for fluorine polluted soil and repair method for fluorine polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 25g of peat, dry it naturally, and grind it through a 60-mesh sieve; add the peat to 150mL of phosphoric acid solution with a concentration of 10mol / L, and heat it in a boiling water bath for 2h; filter the solution obtained by suction, and use deionized water to filter the Wash the obtained solid until the solution is neutral; dry the filtered solid in an oven at 105°C, after drying, grind the obtained solid through a 60-mesh sieve; weigh 20g of the solid powder obtained in the previous step, and add it to 5g / L 200mL of polyaluminum chloride solution, stirred and reacted at 80°C for 2h; the solution obtained from the reaction was subjected to suction filtration, and the solid obtained by suction filtration was dried in an oven at 105°C. After drying, the obtained solid was ground and passed through a 60-mesh sieve ( That is, the particle size of the particles is less than or equal to 250 μm) to obtain modified peat. Phosphoric acid modification will attach part o...

Embodiment 2

[0031] Weigh 25g of peat, dry it naturally, and grind it through a 60-mesh sieve; add the peat to 150mL of phosphoric acid solution with a concentration of 8mol / L, and heat it in a boiling water bath for 2h; filter the solution obtained from the reaction, and filter it with deionized water. Wash the obtained solid until the solution is neutral; dry the filtered solid in an oven at 105°C, after drying, grind the obtained solid through a 60-mesh sieve; weigh 20g of the solid powder obtained in the previous step, and add it to 5g / L 200mL of polyaluminum chloride solution, stirred and reacted at 80°C for 2h; the solution obtained from the reaction was suction filtered, and the solid obtained by suction filtration was dried in an oven at 105°C. After drying, the obtained solid was ground and passed through a 60-mesh sieve to obtain Modified peat.

[0032] Weigh 10g of the above-prepared peat, 10g of calcium magnesium phosphate fertilizer, and 80g of calcium carbonate, mix and grind...

Embodiment 3

[0034] Weigh 40g of peat, dry it naturally, and grind it through a 60-mesh sieve; add peat to 200mL of phosphoric acid solution with a concentration of 10mol / L, and heat it in a boiling water bath for 2h; filter the solution obtained by suction, and filter it with deionized water. Wash the obtained solid until the solution is neutral; dry the filtered solid in an oven at 105°C, after drying, grind the obtained solid through a 60-mesh sieve; weigh 30g of the solid powder obtained in the previous step, and add it to 5g / L 200mL of polyaluminum chloride solution, stirred and reacted at 80°C for 2h; the solution obtained from the reaction was suction filtered, and the solid obtained by suction filtration was dried in an oven at 105°C. After drying, the obtained solid was ground and passed through a 60-mesh sieve to obtain Modified peat.

[0035] Weigh 25g of peat, 25g of calcium magnesium phosphate fertilizer, and 50g of calcium hydroxide prepared above, mix and grind, pass through...

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Abstract

The present invention discloses a repair agent for fluorine polluted soil and a repair method for the fluorine polluted soil. The repair agent for the fluorine polluted soil comprises modified peat, calcium magnesium phosphate, and at least one of calcium carbonate, calcium oxide or calcium hydroxide; the repair method for the fluorine polluted soil comprises the following steps: analyzing bulk density of the fluorine polluted soil and the content of water soluble fluorine in the soil; and adding the repair agent for the fluorine polluted soil into the fluorine polluted soil, wherein the repair agent is as described above. The water soluble fluorine in the soil can be converted into calcium fluorophosphate and other insoluble materials by the calcium and phosphorus in the repair agent; the content of the water soluble fluorine in the soil can be further reduced by adsorption of the modified peat; the fluorine polluted soil can be repaired by using various low-cost raw materials after a simple process; activity of fluorine in the soil can be effectively reduced, thereby reducing harm of fluorine.

Description

technical field [0001] The invention relates to soil pollution control technology, in particular to a remediation agent for fluorine-contaminated soil and a method for remediation of fluorine-contaminated soil. Background technique [0002] Fluoride is an indispensable trace component in the human body. Daily intake of appropriate amount of fluorine is beneficial to prevent tooth decay, and also plays an indispensable role in the formation of bones and the enhancement of bone strength. However, excessive intake of fluorine is harmful to Unfavorable to the human body. Fluorine deficiency will lead to deterioration of tooth quality, easy to fall off. Excessive fluorine will inhibit the enzymatic process in the body, destroy the normal calcium and phosphorus metabolism of the human body, cause calcium to deposit from normal tissues and cause blood calcium to decrease. Because the mineralization of fluorine may change calcium hydroxyphosphate in bones into calcium fluoride pho...

Claims

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Application Information

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IPC IPC(8): C09K17/06B09C1/08
CPCB09C1/08C09K17/06
Inventor 黄雷龚亚龙张时伟任重刘登彪许闯李红艳
Owner GUANGZHOU HUANFA ENVIRONMENTAL ENG CO LTD
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