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Remediation agent applicable to heavy metal pollution of southern acid rice field soil and preparation method of remediation agent

A remediation agent and heavy metal technology, applied in the field of soil pollution control, can solve problems such as poor targeting, achieve light targeting, ensure remediation effect and efficiency, and reduce cadmium well.

Inactive Publication Date: 2019-08-02
HENAN QINGSHUIYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difference in soil environment, this method is not very specific

Method used

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  • Remediation agent applicable to heavy metal pollution of southern acid rice field soil and preparation method of remediation agent
  • Remediation agent applicable to heavy metal pollution of southern acid rice field soil and preparation method of remediation agent

Examples

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Effect test

Embodiment 1

[0026] A remediation agent suitable for heavy metal pollution in southern acid paddy soil, comprising 12 parts by weight of chelated manganese, 1.5 parts of silicon dioxide, 28 parts of zinc sulfate, 1.7 parts of magnesium phosphate, 0.8 parts of ferrous sulfate, and 1.2 parts of sulfur 1 part, 1 part of calcium oxide and 120 parts of bentonite.

[0027] Chelated Manganese as EDTA•Na 2 Mn;

[0028] Bentonite is (Na,Ca)0.33(Al,Mg) 2 [Si 4 O10](OH) 2 •nH 2 O.

[0029] Its preparation method comprises the following steps:

[0030] A Immerse bentonite of a certain fineness (120-200 mesh) in sulfuric acid, hydrochloric acid or phosphoric acid solution, mix well, wash with distilled water until nearly neutral, and after suction filtration, dry the solid at 110°C for 1.5-2 hours to obtain acid-activated bentonite . Add the acidified bentonite to a highly dispersed mercapto reagent in a water-soluble solvent, the ratio of acidic bentonite to mercapto reagent is 1:1.5, stir and...

Embodiment 2

[0036] A remediation agent suitable for heavy metal pollution in southern acid paddy soil, comprising 8 parts of chelated manganese, 2 parts of silicon dioxide, 25 parts of zinc sulfate, 3 parts of magnesium phosphate, 0.8 parts of ferrous sulfate, and 1 part of sulfur in parts by weight parts, 0.8 parts of calcium oxide and 120 parts of bentonite.

[0037] Chelated Manganese as EDTA•Na 2 Mn;

[0038]Bentonite is (Na,Ca)0.33(Al,Mg) 2 [Si 4 o 10 ](OH) 2 •nH 2 O.

[0039] Its preparation method comprises the following steps:

[0040] A Immerse bentonite of a certain fineness (120-200 mesh) in sulfuric acid, hydrochloric acid or phosphoric acid solution, mix well, wash with distilled water until nearly neutral, and after suction filtration, dry the solid at 110°C for 1.5-2 hours to obtain acid-activated bentonite . Add the acidified bentonite to a highly dispersed mercapto reagent in a water-soluble solvent, the ratio of acidic bentonite to mercapto reagent is 1:1.5, sti...

Embodiment 3

[0046] A remediation agent suitable for heavy metal pollution in southern acid paddy soil, comprising 16 parts by weight of chelated manganese, 0.5 parts of silicon dioxide, 30 parts of zinc sulfate, 1 part of magnesium phosphate, 0.8 parts of ferrous sulfate, and 1.5 parts of sulfur Parts, 1.2 parts of calcium oxide and 120 parts of bentonite.

[0047] Chelated Manganese as EDTA•Na 2 Mn;

[0048] Bentonite is (Na,Ca)0.33(Al,Mg)2[Si4O10](OH)2•nH2O.

[0049] Its preparation method comprises the following steps:

[0050] A Immerse bentonite of a certain fineness (120-200 mesh) in sulfuric acid, hydrochloric acid or phosphoric acid solution, mix well, wash with distilled water until nearly neutral, and after suction filtration, dry the solid at 110°C for 1.5-2 hours to obtain acid-activated bentonite . Add the acidified bentonite to a highly dispersed mercapto reagent in a water-soluble solvent, the ratio of acidic bentonite to mercapto reagent is 1:1.5, stir and react at roo...

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Abstract

The invention relates to a remediation agent applicable to heavy metal pollution of southern acid rice field soil and a preparation method of the remediation agent. The remediation agent is prepared from 8-16 parts of manganese chelate, 0.5-2 parts of silicon dioxide, 25-30 parts of zinc sulfate, 1-3 parts of magnesium phosphate, 0.8 parts of ferrous sulfate, 1-1.5 parts of sulfur, 0.8-1.2 parts of calcium oxide and 120 parts of bentonite. The remediation agent has the Cd passivation rate of the acid rice field soil reaching 50% or above, can inhibit rice Cd enrichment, increase soil nutrientcontent and improve soil structures so as to increase the crop yield, and is low in price, convenient to operate, clean and free of secondary pollution.

Description

technical field [0001] The invention relates to a remediation agent suitable for heavy metal pollution in southern acid paddy soil and a preparation method thereof, belonging to the field of soil pollution control. Background technique [0002] Adding amendments to the soil is currently a common repair method for heavy metal pollution in farmland soil. It can not only change the physical and chemical properties of the soil, but also change the existing form of heavy metals in the soil through adsorption, precipitation, complexation, chelation, and inhibition. Thereby reducing its bioavailability and mobility and immobilizing toxic heavy metals in the soil. Commonly used modifiers include lime, phosphate, silicate, surfactant, organic matter, etc. This method is simple to operate and suitable for less polluted soil. However, it is not a permanent solution. While repairing the soil, it is easy to precipitate the nutrient elements necessary for plants, resulting in a lack of ...

Claims

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Application Information

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IPC IPC(8): C05G3/04C05G3/80
CPCC05B9/00C05G3/80
Inventor 王佳佳蔡斌陈卫平刘威李硕杨阳王洁琳
Owner HENAN QINGSHUIYUAN TECH
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