Cadmium (Cd) passivator for acid soil and application thereof

A technology of acidic soil and passivation agent, which is applied in application, soil conditioning materials, restoration of polluted soil, etc. It can solve the problems of reducing soil arableness, unstable passivation effect, and imbalance of elements such as calcium and magnesium, and achieves Solve the problem of resource utilization, ensure the effect of cadmium repair, and promote the effect of plant growth
CN107446589AActive Publication Date: 2017-12-08JIANGXI JIEDI ENVIRONMENTAL TREATMENT & ECOLOGICAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGXI JIEDI ENVIRONMENTAL TREATMENT & ECOLOGICAL TECH CO LTD
Publication Date
2017-12-08

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Abstract

The invention discloses a cadmium (Cd) passivator for acid soil. The Cd passivator is prepared from the following components of rice hull charcoal, lime, hydroxyapatite and hematite. The Cd passivator for the acid soil, which is provided by the invention, can be used for improving the pH (potential of Hydrogen) of soil and decreasing the content of CaCl2 and ethylic acid extraction state Cd, and is used for promoting the conversion of Cd in the soil from a bioavailable state (an ion exchange state) to a potential available state (a carbonate binding state and a ferromanganese oxide binding state) and an unavailable state (a residue state), reaching the purpose of passivating the activity of the Cd, effectively restoring Cd polluted acid soil, promoting the growth of a plant and decreasing the absorption to the Cd of a crop.
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Description

technical field

[0001] The invention relates to the field of remediation of heavy metal polluted soil, in particular to a cadmium passivator for acidic soil and its application. Background technique

[0002] Heavy metals cannot be degraded by microorganisms in nature, so they will persist after entering the soil environment. In 2014, the Ministry of Environmental Protection and the Ministry of Land and Resources issued the "National Soil Pollution Survey Bulletin", which showed that the proportion of pollution points below the severe level exceeded the standard by 15%, and cadmium became the primary pollutant in my country's cultivated soil, and the rate of point points exceeding the standard was 7%. . Large-scale soil pollution not only threatens the red line of 1.8 billion mu of arable land, but also affects human health and social stability.

[0003] The chemical stabilization method is to reduce the effective activity of heavy metals in the soil and reduce the absorptio...

Claims

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