A kind of soil cadmium passivator and its preparation method and application

Abstract

The invention provides a soil cadmium passivant which comprises the following raw materials in parts by weight: 30-85% of red mud, 10-70% of rape stalk, less than or equal to 10% of lime, less than or equal to 5% of phosphatic fertilizer, and less than or equal to 1% of zinc, wherein when pH of soil is greater than 6, the lime is equal to 0%. The soil cadmium passivant aims at reducing effective cadmium in the soil; the main raw materials belong to recycled wastes; the consumption of the auxiliary materials is less; the total cost is very low; the pretreatment of the raw materials is very simple, convenient and easy; special treatment processes such as chemical method modification are not required; the passivant can be obtained only by simple air drying, crushing, screening and mixing; the technology is simple; an application method of a passivant product is relatively simple; the passivation on soil cadmium is higher; the passivant has specificity and is wide in application scope; secondary pollution cannot be generated on the soil; the quality and the yield of crops cannot be influenced; the content of effective cadmium in the soil can be reduced effectively; and the passivant is suitable for various moderately and slightly polluted soil types.

Description

technical field [0001] The invention belongs to the field of chemistry, relates to soil pollution control technology in the field of environmental protection, in particular to a technology for reducing tobacco cadmium. Background technique [0002] Cadmium is one of the heavy metal elements that are highly toxic to plants and humans in the environment. Heavy metal pollution is characterized by wide range, long duration, hidden pollution, inability to be biodegraded, and may continue to accumulate in organisms through the food chain. Soil The main sources of cadmium are soil-forming minerals, chemical fertilizers, organic fertilizers and the surface. Existing methods to reduce heavy metals in soil include engineering measures in physical remediation technology (external soil, soil replacement and topsoil removal, etc.), soil leaching method, electrodynamic remediation method and vitrification technology; chemical remediation technology and bioremediation technology The feasi...

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Problems solved by technology

[0003] Now the method of chemical remediation is widely used in soil heavy metal control (CN201210227669.5, CN201110059232.0, CN201210550280.4), but the cost is higher, and the effect of low-cost soil cadmium passivator is not good

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