Biochar mixing type protected horticultural vegetable field soil heavy metal passivant and preparation method thereof

Abstract

The invention relates to a soil improvement technology and an environment protection technology and particularly discloses a biochar mixing type protected horticultural vegetable field soil heavy metal passivant and a preparation method thereof. The soil heavy metal passivant comprises the following components in percentage by weight: 50 to 60 percent of biochar, 5 to 10 percent of medical stone powder, 5 to 10 percent of diatomite powder, 10 to 20 percent of lignite and 10 to 20 percent of coal ash. The preparation method for the soil heavy metal passivant comprises the following steps of: mixing the medical stone powder which is screened by an 80-mesh sieve, the diatomite powder which is screened by an 80-mesh sieve, the lignite, and the coal ash which is screened by an 80-mesh sieve, uniformly stirring, mixing with biochar which is screened by a 20-mesh sieve, fully stirring, and mixing uniformly to prepare the soil heavy metal passivant. The soil heavy metal passivant is easy to prepare; and the effects of passivating the protected horticultural vegetable field soil heavy metal, and reducing the content of recyclable heavy metal of plant in soil can be achieved under the synergistic effects of all components.

Description

technical field [0001] The invention relates to soil improvement technology and environmental protection technology, in particular to a biological charcoal mixed-type facility vegetable field soil heavy metal passivator and a preparation method thereof. Background technique [0002] Heavy metal pollution in vegetables is mainly related to soil environment, irrigation water quality, and human management measures. Many areas of our country have successively established large-area pollution-free vegetable production demonstration bases, and people attach great importance to the problem of reducing pesticide residues in vegetables. There is still a lack of very effective technical measures for reducing heavy metal content in vegetables. The problem of excessive heavy metals in vegetable soil has gradually become a prominent environmental problem that threatens the development of vegetables in China and needs to be solved urgently. The use of agricultural chemicals such as pesti...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a kind of biological charcoal compounding type facility vegetable field soil heavy metal deactivator and its preparation method, which is a simple process, sufficient raw materials, low cost, obvious application effect using biochar, medical stone , diatomaceous earth, lignite, and fly ash are the method of making facility vegetable field soil heavy metal passivator as main raw materials, which are used to passivate facility vegetable field soil heavy metals, reduce the crop available state heavy metal content in soil, and solve the problem of facility vegetable field Soil Heavy Metal Pollution Affects Its Sustainable Utilization

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