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Heavy metal contaminated soil remediation agent and preparation method and application method thereof

A technology of polluted soil and application method, applied in the field of heavy metal polluted soil remediation agent and preparation thereof, can solve the problems of low removal effect and remediation efficiency, poor leaching effect, high chemical cost, etc. Inhibition of leaching, improved compatibility and dispersibility

Pending Publication Date: 2020-05-05
卢再亮
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although this chemical washing repair method overcomes the existing Na 2 The method of washing heavy metal-contaminated soil with EDTA solution is expensive, produces more filtrate, and is troublesome for subsequent treatment. It has the advantages of 81.6-81.8% removal rate for cadmium and 55.9-60.1% removal rate for lead. but using Na 2 EDTA solution washes heavy metal soil, sodium ions are likely to remain in the soil, and Na 2 The EDTA solution has poor leaching effect on divalent heavy metal ions such as copper, zinc, chromium and nickel in heavy metal soil, and the removal effect and repair efficiency are not high

Method used

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  • Heavy metal contaminated soil remediation agent and preparation method and application method thereof
  • Heavy metal contaminated soil remediation agent and preparation method and application method thereof
  • Heavy metal contaminated soil remediation agent and preparation method and application method thereof

Examples

Experimental program
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Effect test

preparation example 1-3

[0046] Preparation Example 1-3 The resorcinol-formaldehyde resin is selected from the resorcinol-formaldehyde resin of the model A-250 sold by Shanghai Autong Industrial Co., Ltd., and the silane coupling agent KH-570 is selected from Guangzhou Zhongjie Chemical Industry Co., Ltd. Co., Ltd. sold the silane coupling agent KH-570 with the product number of 570, and the carbon nanotubes were selected from the carbon nanotubes with the product number of cnt700 sold by Beijing Deke Daojin Technology Co., Ltd.

preparation example 1

[0047] Preparation Example 1: (1) Put the calcium nitrate solution in a water bath at 40°C and heat it for 30 minutes. When the water bath is heated, add diamine hydrogen phosphate, keep stirring and add ammonia water, make the pH of the mixed solution 10, stir for 8 hours, transfer to a In a polytetrafluoroethylene-lined high-pressure steamer, hot-press at 100°C for 8 hours, filter, and wash the filtrate with deionized water until the conductivity is lower than 2mS·m -1 , making nano-hydroxyapatite, the mass ratio of calcium nitrate and diammonium hydrogen phosphate is 1:5;

[0048] (2) Add 0.8 kg of resorcinol-formaldehyde resin microspheres and 0.5 kg of lithium chloride to 5.5 kg of nano-hydroxyapatite, mix them at 50 ° C for 2 hours, and then add 1.2 kg of silane coupling agent KH -570 and 3.5kg carbon nanotubes, heated up to 80°C, mixed evenly, cooled to room temperature, and prepared nano-hydroxyapatite.

preparation example 2

[0049] Preparation Example 2: (1) Put the calcium nitrate solution in a water bath at 45°C and heat it for 25 minutes. When the water bath is heated, add diamine hydrogen phosphate, keep stirring and add ammonia water, make the pH of the mixed solution 10, stir for 8 hours, transfer to a In a polytetrafluoroethylene-lined high-pressure steamer, hot-press at 105°C for 7.5h, filter, and wash the filtrate with deionized water until the conductivity is lower than 2mS·m -1 , making nano-hydroxyapatite, the mass ratio of calcium nitrate and diammonium hydrogen phosphate is 1:6;

[0050] (2) Add 1.2 kg of resorcinol-formaldehyde resin microspheres and 0.8 kg of lithium chloride to 8 kg of nano-hydroxyapatite, mix and mix at 65 ° C for 1.5 h, then add 1.5 kg of silane coupling agent KH -570 and 4.5kg carbon nanotubes, heated up to 85°C, mixed evenly, cooled to room temperature, and prepared nano-hydroxyapatite.

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Abstract

The invention discloses a heavy metal contaminated soil remediation agent as well as a preparation method and an application method thereof. The heavy metal contaminated soil remediation agent comprises a fixing agent component and a conditioner component in a mass ratio of 1: (2-3). The curing agent component is prepared from the following components in parts by weight: 15 to 35 parts of modifiednano-hydroxyapatite, 12.5 to 28.5 parts of sulfuric acid modified bentonite, 5 to 9 parts of zeolite, 3 to 7 parts of limestone, 6 to 10 parts of tartaric acid, 6 to 10 parts of activated steel slagand 1 to 3 parts of a chelating agent. The conditioner is prepared from the following components in parts by weight: 15 to 35 parts of modified medical stone, 12 to 20 parts of modified straw, 5.8 to9 parts of nano iron powder, 3 to 11 parts of sodium humate, 4 to 12 parts of fly ash, 5.6 to 7.2 parts of carboxymethyl cellulose and 10 to 14 parts of charcoal. The heavy metal contaminated soil remediation agent has the advantage of a good removal effect and remediation effect on divalent heavy metal ions such as copper, zinc, chromium and nickel.

Description

technical field [0001] The invention relates to the technical field of soil remediation, more specifically, it relates to a heavy metal polluted soil remediation agent and its preparation method and application method. Background technique [0002] The heavy metals that pollute the soil mainly include mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and metalloid arsenic (As) and other elements with significant biological toxicity, as well as zinc (Zn) and copper with certain toxicity. (Cu), nickel (Ni) and other elements. It mainly comes from industrial and mining waste residues, wastewater, sludge, pesticides, and atmospheric deposition of smoke and dust. Heavy metal pollutants have little mobility in the soil, are not easy to leach with water, and are not degraded by microorganisms. They enter the human body through the food chain and cause poisoning. Potential hazards to residents' health are extremely high. [0003] Therefore, how to take effective measures to rem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08C09K101/00
CPCB09C1/08C09K17/40C09K2101/00
Inventor 卢再亮
Owner 卢再亮
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