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Soil cadmium passivator as well as preparation method and application thereof

A passivating agent and soil technology, which is applied in the field of soil treatment, can solve the problems of poor passivation effect and complicated preparation method, achieve weak migration ability, increase soil pH value, reduce effective cadmium content and biological cadmium content Effect

Inactive Publication Date: 2017-07-21
INST OF SOIL FERTILIZER & RESOURCE ENVIRONMENT JIANGXI ACAD OF AGRI SCI
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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 overcome the defects of poor passivation effect and complicated preparation method in the heavy metal cadmium passivator in the prior art, and then provide a soil cadmium passivator with good passivation effect and simple preparation method

Method used

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  • Soil cadmium passivator as well as preparation method and application thereof
  • Soil cadmium passivator as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The cadmium passivator provided in this example contains 96% of biochar, 1% of quicklime and 3% of sodium alginate based on the total mass.

[0031] The preparation method of the cadmium passivator provided by the present embodiment comprises the steps:

[0032] (1) crushing rice straw biochar into 60-mesh granules;

[0033] (2) dissolving sodium alginate in water to prepare an aqueous sodium alginate solution with a mass concentration of 1%;

[0034] (3) adding quicklime and pulverized biochar into an aqueous solution of sodium alginate, stirring evenly, and extruding;

[0035] (4) prepare the calcium chloride aqueous solution that mass concentration is 30%, put the mixture extruded in step (3) into calcium chloride aqueous solution and solidify, filter, dry 1.5h at 40 ℃, obtain obtained Soil cadmium passivator.

Embodiment 2

[0037] The cadmium passivator provided in this example contains 94.1% of biochar, 0.9% of quicklime and 5% of sodium alginate based on the total mass.

[0038] The preparation method of the cadmium passivator provided by the present embodiment comprises the steps:

[0039] (1) crushing rice straw biochar into 30 mesh particles;

[0040] (2) dissolving sodium alginate in water to prepare an aqueous sodium alginate solution with a mass concentration of 1.5%;

[0041] (3) adding quicklime and pulverized biochar into an aqueous solution of sodium alginate, stirring evenly, and extruding;

[0042] (4) Prepare a calcium chloride aqueous solution with a mass concentration of 25%, put the extruded mixture in step (3) into the calcium chloride aqueous solution to solidify, filter, and dry at 50° C. for 1 hour to obtain the described Soil cadmium passivator.

Embodiment 3

[0044] The cadmium passivator provided in this example contains 90.5% of biochar, 0.8% of quicklime and 8.7% of sodium alginate based on the total mass.

[0045] The preparation method of the cadmium passivator provided by the present embodiment comprises the steps:

[0046] (1) crushing rice straw biochar into 100 mesh particles;

[0047] (2) Dissolving sodium alginate in water to prepare an aqueous solution of sodium alginate with a mass concentration of 0.5%;

[0048] (3) adding quicklime and pulverized biochar into an aqueous solution of sodium alginate, stirring evenly, and extruding;

[0049] (4) Prepare a calcium chloride aqueous solution with a mass concentration of 35%, put the extruded mixture in step (3) into the calcium chloride aqueous solution to solidify, filter, and dry at 30° C. for 2 hours to obtain the described Soil cadmium passivator.

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Abstract

The invention provides a soil cadmium passivator. The soil cadmium passivator is prepared from biological carbon, quick lime and sodium alginate; by means of the quick lime in the soil cadmium passivator, a pH value of soil can be improved, available cadmium in an ionic state is converted into a cadmium sediment in an invalid state such as cadmium hydroxide; the sodium alginate has a good chelating effect on heavy metal cadmium; the biological carbon has certain adsorbing effects on the available cadmium in the ionic state, the cadmium hydroxide and invalid cadmium such as in cadmium a complexing state; the biological carbon, the quick lime and the sodium alginate in the soil cadmium passivator can be mutually matched and cooperated at a specific mixture ratio, so that the effects of reducing the content of the cadmium in an available state in soil and the content of the cadmium in a living body grown in the soil are realized; the soil cadmium passivator also has the advantages that a PH value in the soil is improved, the functions of the soil are improved, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of soil treatment, in particular to a soil cadmium passivator and its preparation method and application. Background technique [0002] With the accelerated development of industrialization and urbanization in China, the pollution of heavy metal cadmium in farmland soil in my country is becoming more and more serious. The pollution of heavy metal cadmium in soil has a wide range of pollution, long duration, hidden pollution and cannot be biodegraded, and can pass through the food chain. In vivo enrichment and other characteristics. At present, the soil heavy metal pollution remediation technology is mainly divided into two aspects. One is to extract the heavy metal cadmium from the soil through chemical leaching, biological extraction or electrodynamic remediation. The structure will cause damage; the second is to add a chemical passivator to the soil through passivation repair technology to convert the effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08B09C1/00C09K101/00C09K109/00
CPCB09C1/00B09C1/08C09K17/40C09K2101/00C09K2109/00
Inventor 吕贵芬
Owner INST OF SOIL FERTILIZER & RESOURCE ENVIRONMENT JIANGXI ACAD OF AGRI SCI
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