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Modifier for conditioning acidic selenium-rich high-cadmium soil and preparation method thereof

A improver and selenium-enriched technology, which is applied in the field of soil pollution control, can solve the problems of increasing the cost of soil remediation and treatment, reducing the effectiveness and limitation of heavy metals, achieving good control effects, reducing the risk of migration, and excellent results

Pending Publication Date: 2021-07-23
四川省地质调查院 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when biochar is used alone, a large amount is required to effectively reduce the effectiveness of heavy metals, which increases the cost of soil remediation and treatment, and limits its application to the treatment of large areas of polluted soil.

Method used

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  • Modifier for conditioning acidic selenium-rich high-cadmium soil and preparation method thereof
  • Modifier for conditioning acidic selenium-rich high-cadmium soil and preparation method thereof
  • Modifier for conditioning acidic selenium-rich high-cadmium soil and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A improver for conditioning acidic selenium-rich and high-cadmium soil, comprising the following components by weight percentage:

[0040] Biochar 20%, slaked lime 20%, and bentonite 60%;

[0041] Wherein, the preparation method of biochar is:

[0042] The sawdust is cleaned up centrally, dried and roughly crushed, then pyrolyzed at 500°C under anoxic conditions to generate biochar, which is pre-crushed by a ball mill.

[0043] The preparation method of the above improver is as follows: mix biochar, slaked lime and bentonite, add water at a solid-to-liquid ratio of 1:4 and stir evenly, sinter at 450°C for 2 hours under anaerobic conditions, and pass through a 20-mesh sieve after cooling.

Embodiment 2

[0045] A improver for conditioning acidic selenium-rich and high-cadmium soil, comprising the following components by weight percentage:

[0046] Biochar 10%, slaked lime 30%, and bentonite 60%;

[0047] Wherein, the preparation method of biochar is:

[0048] Clean up the sawdust in a centralized manner, dry and coarsely crush it, and then pyrolyze it at 400°C under anoxic conditions to generate biochar, which is pre-crushed by a ball mill.

[0049] The preparation method of the above improver is as follows: mix biochar, slaked lime and bentonite, add water at a solid-to-liquid ratio of 1:3 and stir evenly, sinter at 400°C for 2 hours under anaerobic conditions, and pass through a 20-mesh sieve after cooling.

Embodiment 3

[0051] A improver for conditioning acidic selenium-rich and high-cadmium soil, comprising the following components by weight percentage:

[0052] Biochar 30%, slaked lime 30%, and bentonite 40%;

[0053] Wherein, the preparation method of biochar is:

[0054] The sawdust is cleaned up centrally, dried and roughly crushed, then pyrolyzed at 450°C under anoxic conditions to generate biochar, which is pre-crushed by a ball mill.

[0055] The preparation method of the above improver is as follows: mix biochar, slaked lime and bentonite, add water at a solid-to-liquid ratio of 1:5 and stir evenly, sinter at 450°C for 2 hours under anaerobic conditions, and pass through a 20-mesh sieve after cooling.

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Abstract

The invention discloses a modifier for conditioning acidic selenium-rich high-cadmium soil and a preparation method of the modifier. The modifier comprises the following components in percentage by weight: 20-30% of slaked lime, 10-40% of biomass charcoal and 31-65% of bentonite, the preparation method comprises the following steps: mixing the biomass charcoal, the slaked lime and the bentonite according to a formula, adding water according to a solid-to-liquid ratio of 1: 3-1: 5, stirring and mixing, sintering at 400-450 DEG C under an anaerobic condition for 2-3 hours, cooling and sieving to obtain the modifier. According to the method, the activity of cadmium in soil can be effectively controlled by utilizing the biomass charcoal produced from crop straws, the bentonite and the slaked lime, the activity of selenium in the soil is improved, meanwhile, the content of cadmium in rice is reduced, and the content of selenium in crops such as rice is maintained or improved.

Description

technical field [0001] The invention relates to the technical field of soil pollution control, in particular to an amendment for conditioning acidic selenium-rich and high-cadmium soil and a preparation method thereof. Background technique [0002] Selenium is an essential trace element in the life activities of humans and animals. It has a strong antioxidant effect and can reduce and decompose peroxides produced in the human body, degrade and eliminate free radicals, and protect cell membranes from damage by free radicals; at the same time , selenium has a good anti-cancer effect, it can activate tumor suppressor genes, repair damaged cells, thereby effectively enhancing the immunity of animals and plants; in addition, selenium is also a natural antidote, it can interact with cadmium, mercury , arsenic and other toxic heavy metal elements produce antagonism, and form metal selenoprotein complex, so as to achieve the effect of resisting disinfection. [0003] The selenium e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/80C09K17/06A01B79/02C09K101/00C09K109/00
CPCC05D3/02C05G3/80C09K17/06A01B79/02C09K2101/00C09K2109/00C05D9/00
Inventor 李忠惠徐志强梁斌王玉婷蒋卉段嘉欣张德银苟才明
Owner 四川省地质调查院
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