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Long-acting passivator for cadmium in soil, and preparation method and application thereof

A passivating agent and soil technology, applied in the field of contaminated soil treatment, can solve the problems of restricting the popularization and application of passivating agents, difficulty in ensuring safe production, and unsatisfactory passivation effect, so as to improve the passivation effect of the season, particle rules, The effect of fast dispersion

Active Publication Date: 2020-03-31
ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, in the practical application of soil cadmium passivators, there are mainly problems such as unsatisfactory passivation effect, mainly acting on the current season, and poor aftereffect. Popularization and application of chemical agents in the treatment of cadmium-contaminated soil

Method used

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  • Long-acting passivator for cadmium in soil, and preparation method and application thereof
  • Long-acting passivator for cadmium in soil, and preparation method and application thereof
  • Long-acting passivator for cadmium in soil, and preparation method and application thereof

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Embodiment 1

[0025] This embodiment provides a long-acting soil cadmium passivator, which is composed of calcite mineral powder, humic acid and corn starch, the mass fraction of humic acid is 1%, the mass fraction of corn starch is 3%, and the rest is calcite mineral powder . Calcite mineral powder has a calcium carbonate content of 86% and a particle size of 10 mesh. The particle size of cornstarch is 50 mesh.

Embodiment 2

[0027] This embodiment provides a long-acting soil cadmium passivator, which is composed of calcite mineral powder, humic acid and corn starch, the mass fraction of humic acid is 5%, the mass fraction of corn starch is 6%, and the rest is calcite mineral powder . Calcite ore powder has a calcium carbonate content of 90% and a particle size of 30 mesh. The particle size of cornstarch is 150 mesh.

Embodiment 3

[0029] This embodiment provides a long-acting soil cadmium passivator, which is composed of calcite mineral powder, humic acid and corn starch, the mass fraction of humic acid is 3%, the mass fraction of corn starch is 5%, and the rest is calcite mineral powder . Calcite ore powder has a calcium carbonate content of 94% and a particle size of 20 mesh. The particle size of cornstarch is 100 mesh.

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Abstract

The invention discloses a long-acting passivator for cadmium in soil, and a preparation method and application thereof. The long-acting passivator for cadmium in soil comprises calcite mineral powder,humic acid and a binder, wherein the mass fraction of humic acid is 1-5%, and the mass fraction of the binder is 3-6%. The preparation method comprises the following steps: putting the calcite mineral powder into a disc granulator; mixing the humic acid and the binder and adding water to form an aqueous solution; and allowing the aqueous solution enter the disc granulator through multi-angle spraying, and enabling the above materials to be agglomerated into particles through granulation. According to the long-acting passivator for cadmium in soil disclosed by the invention, the calcite mineral powder is selected for cooperation with the humic acid, so in-season passivation effect is improved, and good subsequent passivation effect can be maintained; and with the preparation method disclosed by the invention, the obtained passivator is in the form of a regular particle and has high dispersion speed after meeting water.

Description

technical field [0001] The invention belongs to the field of contaminated soil treatment, in particular to a long-acting soil cadmium passivator, a preparation method and application. Background technique [0002] In the treatment of mildly and moderately cadmium-polluted soils, the use of passivators to reduce the bioavailability of cadmium, thereby reducing the accumulation of cadmium in plants and edible parts, has strong operability in production practice and thus has a prospect of popularization and application. [0003] The mechanism of action of soil cadmium passivators reported in domestic literature is mainly through the self-adsorption, chelation, and immobilization functions of passivators, such as biochar, zeolite, etc., or by adjusting the soil acid-base environment, such as lime, phosphate rock powder, etc., thereby Reduce the bioavailability of cadmium in soil. [0004] At present, in the practical application of soil cadmium passivators, there are mainly pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K101/00
CPCC09K17/40C09K2101/00
Inventor 林义成刘琛郭彬傅庆林李华李凝玉丁能飞刘俊丽陈晓冬
Owner ZHEJIANG ACADEMY OF AGRICULTURE SCIENCES
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