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Composite passivator for reducing oilseed rape land soil cadmium pollution, preparation method thereof and application of composite passivator

A passivation agent and cadmium pollution technology, applied in the direction of chemical instruments and methods, applications, soil conditioning materials, etc., can solve the problems of insufficient passivation effect and influence of physical and chemical properties, achieve significant passivation effect, reduce poisonous effect, Effect of High Ion Exchange Capacity

Active Publication Date: 2018-02-02
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the application of inorganic passivators can greatly reduce the content of effective heavy metals in the soil, but a large amount of application will have a huge impact on the original physical and chemical properties of the soil; and the application of organic passivators can also passivate heavy metals and Dual action to improve soil properties, but its passivation effect is not long-lasting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method comprises the following steps:

[0028] 1) Preparation of rice husk biochar: rice husk was pyrolyzed at 500°C for 2 hours under anoxic conditions, ground, passed through a 100-mesh sieve, and the under-sieve was taken for later use;

[0029] 2) Weigh 20kg of rice husk biochar, 30kg of humus, 15kg of limestone, 15kg of ammonium sulfate, 5kg of nano-hydroxyapatite, 10kg of sepiolite, and 5kg of attapulgite, mix well, grind, dry, and pass through a 40-mesh sieve first , take the undersize and pass it through an 80-mesh sieve, and take the undersize to obtain a composite passivator.

Embodiment 2

[0031] The preparation method comprises the following steps:

[0032] 1) Preparation of rice husk biochar: rice husk was pyrolyzed at 500°C for 2 hours under anoxic conditions, ground, passed through a 100-mesh sieve, and the under-sieve was taken for later use;

[0033] 2) Weigh 30kg of rice husk biochar, 25kg of humus, 20kg of limestone, 5kg of ammonium sulfate, 10kg of nano-hydroxyapatite, 7kg of sepiolite, and 3kg of attapulgite, mix well, grind, dry, and pass through a 40-mesh sieve first , take the undersize and pass it through an 80-mesh sieve, and take the undersize to obtain a composite passivator.

Embodiment 3

[0035] 1) Preparation of rice husk biochar: rice husk was pyrolyzed at 500°C for 2 hours under anoxic conditions, ground, passed through a 100-mesh sieve, and the under-sieve was taken for later use;

[0036] 2) Weigh 30kg of rice husk biochar, 25kg of humus, 20kg of limestone, 10kg of ammonium sulfate, 5kg of nano-hydroxyapatite, 5kg of sepiolite, and 5kg of attapulgite, mix well, grind, dry, and pass through a 40-mesh sieve first , take the undersize and pass it through an 80-mesh sieve, and take the undersize to obtain a composite passivator.

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PUM

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Abstract

The invention provides a composite passivator for reducing oilseed rape land soil cadmium pollution, a preparation method thereof and an application of the composite passivator. The composite passivator is prepared from rice husk biochar, humus, limestone, ammonium sulfate, nano-hydroxyapatite, sepiolite and attapulgite. By the aid of the composite passivator, the available cadmium content of soiland the cadmium content of an overground part and an underground part of an oilseed rape can be remarkably reduced, the pH (potential of hydrogen) value of the soil can be improved, the composite passivator can be used for treating extensive heavy metal cadmium polluted oilseed rape land soil, the content of organic matters is greatly increased, and soil physical and chemical properties are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of ecological restoration, and in particular relates to a composite passivator suitable for reducing cadmium pollution in rapeseed soil, a preparation method and application thereof. Background technique [0002] With the development of industry, soil heavy metal pollution is becoming more and more serious. Soil heavy metal pollution has the characteristics of wide pollution range, long duration, strong pollution concealment, and inability to be biodegraded. Cadmium is a highly toxic and relatively common heavy metal element in farmland soil, which can pass along the food chain and endanger human health. Cadmium can cause pathological changes in kidney organs, etc., and affect people's normal activities. Cause anemia, high blood pressure, neuralgia, osteoporosis, nephritis and secretion disorders and other diseases. In recent years, due to the impact of activities such as sewage irrigation, sludge agricul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K109/00C09K101/00
CPCC09K17/40C09K2101/00C09K2109/00
Inventor 包红旭苏弘治张浩杨华张欣张馨月李良玉党秀丽王风李丽丹
Owner LIAONING UNIVERSITY
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