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Cadmium-contaminated soil remedying agent

A technology for cadmium-contaminated soil and a remediation agent, applied in the field of soil remediation, can solve problems such as poor remediation effect of cadmium-contaminated soil, and achieve the effects of reducing toxic effects, improving soil fertility, and reducing mobility

Inactive Publication Date: 2019-02-15
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a cadmium-contaminated soil remediation agent for the problem that the soil remediation agents commonly used for cadmium-contaminated soils have poor remediation effects on cadmium-contaminated soils

Method used

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  • Cadmium-contaminated soil remedying agent

Examples

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preparation example Construction

[0027] Preparation of modified attapulgite: Mix attapulgite and isocyanate at a mass ratio of 12-20:1, stir magnetically at 450-700r / min for 30-50min, add attapulgite mass 6-10% silane coupling agent KH-560, grind at 350-550r / min for 2-4 hours, pass through a 200-mesh sieve, collect the sieved particles, add fulvic acid, salt material, and additives in a mass ratio of 7-12:3:1:2, and mix with liquid After nitrogen spraying and freezing, the frozen material is obtained. The frozen material is mixed with ball milling medium at a mass ratio of 8 to 15:1, and mixed with zirconia ball milling beads at a mass ratio of 20 to 30:1. After 1-3 hours, the modified attapulgite is obtained.

[0028] The preparation method of composite base material, comprises the steps:

[0029] (1) According to the mass ratio of 5-8:2, take basalt and muscovite and grind them in a pulverizer, pass through a 200-mesh sieve, collect the sieved particles, add reagent A to mix and stir at a mass ratio of 1:7...

Embodiment 1

[0036] Salt material: Mix zinc sulfate and zinc chloride at a mass ratio of 5:1 to obtain salt material.

[0037] Reagent A: Mix 20% sodium carbonate solution and sodium citrate at a mass ratio of 6:1 to obtain reagent A.

[0038] Reagent B: Mix 70% ethanol solution and polyvinylpyrrolidone at a mass ratio of 12:1 to obtain Reagent B.

[0039] Auxiliary: take hydroxyapatite and vermiculite according to the mass ratio of 5:2, grind them through a 150-mesh sieve in a pulverizer, and collect the sieved particles to obtain the auxiliary agent.

[0040] Ball milling medium: Mix acetone and glycerin at a volume ratio of 4:1 to obtain a ball milling medium.

[0041] Emulsifier: Mix polyacrylamide and soybean lecithin at a mass ratio of 7:2 to obtain an emulsifier.

[0042] Additive: Mix methylphenol and methoxyphenol at a mass ratio of 3:1 to obtain the additive.

[0043] Preparation of modified attapulgite: Mix attapulgite and isocyanate at a mass ratio of 12:1, stir magnetically a...

Embodiment 2

[0052] Salt material: Mix zinc sulfate and zinc chloride at a mass ratio of 5:3 to obtain salt material.

[0053] Reagent A: Mix 20% sodium carbonate solution and sodium citrate at a mass ratio of 10:1 to obtain reagent A.

[0054] Reagent B: Mix 70% ethanol solution and polyvinylpyrrolidone at a mass ratio of 20:1 to obtain Reagent B.

[0055] Auxiliary: take hydroxyapatite and vermiculite according to the mass ratio of 8:2, crush them through a 150-mesh sieve in a pulverizer, and collect the sieved particles to obtain the auxiliary agent.

[0056] Ball milling medium: Mix acetone and glycerin at a volume ratio of 8:1 to obtain a ball milling medium.

[0057] Emulsifier: Mix polyacrylamide and soybean lecithin at a mass ratio of 12:2 to obtain an emulsifier.

[0058] Additive: Mix methylphenol and methoxyphenol at a mass ratio of 6:1 to obtain the additive.

[0059] Preparation of modified attapulgite: Mix attapulgite and isocyanate at a mass ratio of 20:1, stir magnetical...

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Abstract

The invention relates to a cadmium-contaminated soil remedying agent, and belongs to the field of soil remediation. Attapulgite and isocyanate are mixed and modified by a silane coupling agent, so that a molecular bridge between an inorganic component interface and an organic component interface can be built to enhance the acting activity; meanwhile, Zn<2+> contained in salt can antagonize cadmiumions, so that absorption of the cadmium ions by plants and the toxic effect of the cadmium ions on crops are reduced, the mobility of the cadmium ions in soil is reduced, and the effects of passivating and remedying cadmium-contaminated soil are achieved; white mica and basalt are treated to form a three-dimensional crosslinked network so as to fix cadmium and reduce the bioavailability of the cadmium in the soil; protein can be destroyed by the cadmium ions, so that the viscosity is increased and a spatial structure becomes loose; the cadmium ions can be wrapped, so that the effect of reducing the mobility of the cadmium ions in the soil is achieved; and the problem that the current soil remedying agent commonly used for the cadmium-contaminated soil has poor remedying effect on the cadmium-contaminated soil is solved.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a cadmium-contaminated soil remediation agent. Background technique [0002] At present, excessive use of chemical fertilizers can cause soil acidification, which in turn induces an increase in the activity of heavy metal ions in the soil. Every time the soil pH value drops by one unit, the activity of heavy metal cadmium will increase by 100 times, which will increase the risk of diseases such as bone pain disease. The biggest characteristics of agricultural non-point source pollution are concealment, long-term and scattered nature. It is consciously or unconsciously produced in every process of agricultural production, and it is troublesome to deal with. [0003] In view of the serious pollution of heavy metal cadmium in paddy field soil and rice, methods for remediating soil cadmium include bioremediation, agricultural regulation, and engineering physics....

Claims

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Application Information

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IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 雷春生陈建春卢星
Owner CHANGZHOU UNIV
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