Restoration agent for lowering cadmium/lead effective state content in soil, and use method and application thereof

An effective state, remediation agent technology, applied in the field of heavy metal contaminated soil remediation agent, can solve the problems of low heavy metal fixation rate, poor fixation effect repetition rate, secondary pollution, etc. Effect

Active Publication Date: 2015-05-27
HUNAN RES INST FOR NONFERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently commonly used fixatives (restoratives, passivators) have the following problems: organic fixatives are prone to secondary pollution when treating heavy metal-contaminated soil; natural mineral fixatives have a relatively low fixation rate for heavy metals
Existing chemical fixatives rarely deal with heavy pollution, and the developed fixatives are only suitable for dealing with a certain type of limited soil. When chemical fixatives for acidic soils are applied to neutral or calcareous soils, the repeatability of the fixation effect bad
An effective fixative for moderately and lightly polluted soils, even if the dosage is increased, it has little effect on heavily polluted soils

Method used

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  • Restoration agent for lowering cadmium/lead effective state content in soil, and use method and application thereof
  • Restoration agent for lowering cadmium/lead effective state content in soil, and use method and application thereof
  • Restoration agent for lowering cadmium/lead effective state content in soil, and use method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A restoration agent for reducing soil cadmium and lead effective content of the present invention, the composition of the restoration agent comprises: quicklime, calcium sulfate, charcoal, ferric chloride and water, wherein quicklime, calcium sulfate, charcoal, ferric chloride and water The mass of the soil is 1%, 2%, 2%, 1%, 35% of the soil weight. Among them, calcium sulfate and ferric chloride are analytical reagents, excluding crystal water; charcoal is black charcoal fired from common wood in the market, and quicklime and calcium sulfate are both in powder form. The charcoal is crushed granules, and the particle size of the granules is 3 mm.

[0038] The use method of the remediation agent that reduces soil cadmium, lead effective state content of the present embodiment comprises the following steps:

[0039] (1) The heavy metal cadmium and lead polluted acidic soil in Zixing, Hunan Province (available cadmium content is 0.42mg / kg, available lead content is 19.76m...

Embodiment 2

[0046] A restoration agent for reducing soil cadmium and lead effective content of the present invention, the composition of the restoration agent comprises: quicklime, calcium sulfate, charcoal, ferric chloride and water, wherein quicklime, calcium sulfate, charcoal, ferric chloride and water The quality of each is 1%, 2%, 1%, 1%, 40% of the soil weight. Among them, calcium sulfate and ferric chloride are analytical reagents, excluding crystal water; charcoal is black charcoal fired from common wood in the market, and quicklime and calcium sulfate are both in powder form. The charcoal is crushed granules, and the particle size of the granules is 3 mm.

[0047] The use method of the remediation agent that reduces soil cadmium, lead effective state content of the present embodiment comprises the following steps:

[0048] (1) Neutral soil polluted by heavy metal cadmium and lead in Shuikoushan, Hunan Province (available cadmium content is 0.73mg / kg, available lead content is 6....

Embodiment 3

[0055] A restoration agent for reducing soil cadmium and lead effective content of the present invention, the composition of the restoration agent comprises: quicklime, calcium sulfate, charcoal, ferric chloride and water, wherein quicklime, calcium sulfate, charcoal, ferric chloride and water The quality of the soil is 5%, 10%, 5%, 5%, 40% of the soil weight. Among them, calcium sulfate and ferric chloride are analytical reagents, excluding crystal water; charcoal is black charcoal fired from common wood in the market, and quicklime and calcium sulfate are both in powder form. The charcoal is crushed granules, and the particle size of the granules is 3 mm.

[0056] The use method of the remediation agent that reduces soil cadmium, lead effective state content of the present embodiment comprises the following steps:

[0057] (1) Neutral soil polluted by heavy metal cadmium and lead in Yuanling, Hunan Province (available cadmium content is 50.90 mg / kg, available lead content i...

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Abstract

The invention discloses a restoration agent for lowering cadmium/lead effective state content in soil, which is composed of quicklime, calcium sulfate, wood charcoal, iron chloride and water, wherein the weight ratio of the quicklime, calcium sulfate, wood charcoal and iron chloride is (1-2):(1-2):(1-2):(0.5-1), and the water accounts for 30-45 wt% of the soil. The restoration agent can be used for treating heavily polluted soil; and common chemical passivators can only restore lightly polluted soil, and do not have obvious effect on heavy pollution. The restoration agent can be used for treating both acidic soil and neutral soil. The restoration agent has high remediation efficiency for cadmium polluted soil; the reaction mechanisms relate to chemical precipitation and physical adsorption; and when one action fails due to change of the outside conditions, the other action can perform the guarantee function. The restoration agent has certain control actions on the lead effective state content in the polluted soil.

Description

technical field [0001] The invention relates to a remediation agent for heavy metal polluted soil, in particular to a remediation agent for reducing the effective content of cadmium and lead in acidic / neutral soil and a use method thereof. Background technique [0002] Cadmium exists in the form of compounds in nature, there is no separate deposit, and it often coexists with zinc ore, lead-zinc ore, and copper-lead-zinc ore. Cadmium and lead are widely used in electroplating industry, chemical industry, electronics industry and nuclear industry and other fields. Cadmium and lead have high biological toxicity, latent persistence and irreversibility, and are more likely to be adsorbed by crops in soil than other heavy metals, and remain in plants. In recent years, soil cadmium and lead pollution incidents have occurred frequently in my country, such as the "cadmium rice" incident and children's blood lead exceeding the standard, which indicate that soil cadmium and lead pollu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06B09C1/08
Inventor 李倩黄顺红陈伟袁翠玉万文玉万斯王兵欧阳全胜苏珍朱安玲
Owner HUNAN RES INST FOR NONFERROUS METALS
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