Slow-release repairing agent for treating cadmium-arsenic composite polluted rice field soil and preparation method thereof

A compound pollution, slow-release technology, applied in the field of soil remediation, can solve the problems of increasing and decreasing the effectiveness of cadmium, and it is difficult to achieve the effect of reducing the content of cadmium and arsenic in rice, realizing safe utilization, and achieving significant effects.
CN111269722AActive Publication Date: 2020-06-12CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
Publication Date
2020-06-12

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Abstract

The invention discloses a slow-release repairing agent for treating cadmium-arsenic combined pollution rice field soil and a preparation method thereof. The preparation method comprises the followingsteps: (1) fully and uniformly stirring calcium carbonate and calcium magnesium phosphate fertilizer and calcining under nitrogen protection, and obtaining a compound A after the calcined mixture is ground and smashed; (2) adding potassium silicate into water, fully stirring to dissolve potassium silicate, uniformly spraying the dissolved potassium silicate solution onto the surface of the iron powder, and then granulating on a granulator to obtain mixture granules B; (3) putting the compound A and the mixture granules B into the granulator, and gradually spraying pure water until the surfacelayers of the mixture granules B are uniformly coated with the compound A to form granules with the diameter of 3-5 mm; and (4) drying the particles obtained in the step (3) until the water content isless than or equal to 5% to obtain the slow-release repairing agent. The slow-release repairing agent can implement cadmium-arsenic synchronous passivation resistance control in the key growth periodof rice and is small in dosage and effectively reduces the cadmium-arsenic content of the rice and is remarkable and stable in effect.
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Description

technical field

[0001] The invention belongs to the technical field of soil remediation, and in particular relates to a slow-release remediation agent for treating cadmium-arsenic composite polluted paddy field soil and a preparation method thereof. Background technique

[0002] Cultivated land soil is the basic condition for agricultural production and cultivation. The health status and nutrient content in the soil directly affect the growth of crops. At present, with the rapid development of industry and agriculture, a large number of pollutants, especially heavy metals, enter the soil environment, resulting in increasingly serious soil pollution. At the same time, the excessive use of agricultural inputs is also one of the important factors causing soil heavy metal pollution. Cadmium and arsenic are common polluting elements in cultivated soil. According to the 2014 National Soil Environmental Survey Bulletin, the point-exceeding rates of cadmium and arsenic in the nati...

Claims

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