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Solidifying agent of repairing high-concentration multiple heavy metal polluted site and preparation and application methods thereof

An application method and curing agent technology, applied in the direction of chemical instruments and methods, restoration of contaminated soil, application, etc., can solve the problems of high cost, lack of reducibility, increase in soluble arsenic, etc., to achieve strong fixation ability, Good curing effect, good adsorption and reduction effect

Inactive Publication Date: 2014-04-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the remediation of hexavalent chromium pollution, phosphate-based curing agents are difficult to fix hexavalent chromium due to lack of reductivity; similarly, because phosphate as a competing ion will affect the adsorption of arsenic by soil minerals, such as phosphate and The physicochemical behavior of arsenate is similar, but phosphate is more easily adsorbed to soil particles and organic matter surfaces, PO 4 3- Same as AsO 4 3- Competing for adsorption sites, inhibiting the adsorption of arsenic by soil, increasing the amount of soluble arsenic, increasing the risk of As migration to deep soil and polluting groundwater
[0005] When polymetallic contamination is present at a contaminated site, it is difficult to meet site remediation goals using a single phosphate material
For this type of site restoration, pretreatment or rinsing is often used for restoration, but the cost is expensive, and it is only suitable for small-scale heavy metal-contaminated sites

Method used

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  • Solidifying agent of repairing high-concentration multiple heavy metal polluted site and preparation and application methods thereof
  • Solidifying agent of repairing high-concentration multiple heavy metal polluted site and preparation and application methods thereof
  • Solidifying agent of repairing high-concentration multiple heavy metal polluted site and preparation and application methods thereof

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preparation example Construction

[0025] The above-mentioned modified phosphate rock powder is prepared by the following method: first, the phosphate rock is ground and passed through a 200 mesh sieve, and the P in the phosphate rock is 2 o 5 The mass percentage of the phosphate rock is 20-30%, and the phosphate rock powder is obtained. The phosphate rock powder, attapulgite and ferric chloride are uniformly mixed in a mass ratio of 5-4:3-2:1 to form Mixed material; then, mix the mixed material with acetic acid buffer solution with a molar concentration of 1mol / L at a mass ratio of 1:20~30, shake and stir for 10~15 hours at a temperature of 20~30°C, and let stand After 64-80 hours, the first gel-like precipitate is formed, which is dried and pulverized at a temperature of 80-100° C., and passed through a 200-mesh sieve to obtain modified phosphate rock powder.

[0026] The preparation method of the above-mentioned curing agent for repairing high-concentration multiple metal-contaminated sites comprises the f...

Embodiment 1

[0047] According to the preparation method of curing agent of the present invention, adopt above-mentioned test material to prepare curing agent, concrete process is as follows:

[0048] Step 1) Preparation of modified phosphate rock powder: First, grind the phosphate rock through a 200-mesh sieve to obtain phosphate rock powder. The mass ratio of the phosphate rock powder, attapulgite and ferric chloride is 4:2:1 Mix evenly to form a mixed material; then, mix the mixed material with the acetate buffer solution with a molar concentration of 1mol / L in a mass ratio of 1:30, shake and stir for 15 hours at a temperature of 30°C, and let it stand After 80 hours, the first gel-like precipitate was formed, which was dried and pulverized at a temperature of 100° C., and passed through a 200-mesh sieve to obtain modified phosphate rock powder;

[0049] Step 2) Preparation of curing agent: Mix the modified phosphate rock powder prepared in step 1) and light-burned magnesium oxide evenly...

Embodiment 2

[0052] According to the preparation method of curing agent of the present invention, adopt above-mentioned test material to prepare curing agent, concrete process is as follows:

[0053] Step 1) Preparation of modified phosphate rock powder: First, grind the phosphate rock through a 200-mesh sieve to obtain phosphate rock powder. The mass ratio of the phosphate rock powder, attapulgite and ferric chloride is 5:3:1 Mix evenly to form a mixed material; then, mix the mixed material with the acetate buffer solution with a molar concentration of 1mol / L in a mass ratio of 1:20, shake and stir for 10 hours at a temperature of 20°C, and let it stand After 64 hours, the first gel-like precipitate was formed, which was dried and pulverized at a temperature of 80° C., and passed through a 200-mesh sieve to obtain modified phosphate rock powder;

[0054] Step 2) Preparation of curing agent: Mix the modified phosphate rock powder prepared in step 1) and light-burned magnesia evenly to form...

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Abstract

The invention discloses a solidifying agent of repairing a high-concentration multiple heavy metal polluted site. The solidifying agent consists of the following components in percentage by weight: 60-80% of modified powdered rock phosphate and 20-40% of light calcined magnesia. The invention further discloses a preparation method of the solidifying agent. The preparation method comprises the following steps: S1, preparing the modified powdered rock phosphate: uniformly mixing powdered rock phosphate, attapulgite and ferric chloride to form a mixture, then, mixing the mixture with acetic acid buffer liquor to form a first gel-like precipitate and drying and crushing the first gel-like precipitate to prepare the modified powdered rock phosphate; S2, preparing the solidifying agent: uniformly mixing the modified powdered rock phosphate and light calcined magnesia to form mixed powder, mixing the mixed powder and phosphate buffer to form a second gel-like precipitate, and drying and crushing the second gel-like precipitate to prepare the solidifying agent. The invention further discloses an application method of the solidifying agent. The solidifying agent has a good fixing effect to the high-concentration multiple heavy metal polluted site.

Description

technical field [0001] The invention relates to a modifier used in civil engineering or environmental geotechnical engineering, in particular to a curing agent for repairing high-concentration multiple metal polluted sites and a preparation and application method. Background technique [0002] With the expansion of my country's urban construction and the adjustment of industrial layout, most enterprises in the central and suburban areas of the city, such as chemical plants, steel plants, metal smelting, and electroplating plants, have gradually retreated from the city to the outer suburbs, shut down and transferred to work. Due to the outdated equipment of these enterprises and the imperfect discharge technology of industrial "three wastes", a large amount of toxic and harmful heavy metals and other pollutants have entered the foundation soil and groundwater, causing the original site of the enterprise to become an industrial pollution site, seriously affecting the surroundin...

Claims

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Application Information

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IPC IPC(8): C09K17/02B09C1/08C09K103/00
Inventor 杜延军魏明俐杨玉玲朱晶晶
Owner SOUTHEAST UNIV
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