Soil heavy metal passivant for facilities vegetable field and preparation method thereof

Abstract

The invention relates to the soil improvement technology and the environment protection technology, in particular to a soil heavy metal passivant for the facilities vegetable field and a preparation method thereof for solving the problem that due to solid heavy metal pollution, the sustainable utilization of the facilities vegetable field is influenced. The soil heavy metal passivant for the facilities vegetable field comprises the following components in percentage by weight: 10 to 30 percent of medical stone powder, 10 to 30 percent of diatomite in powder, 10 to 20 percent of zeolite powder, 20 to 30 percent of lignite and 25 to 35 percent of fly ash. The preparation method for the soil heavy metal passivant comprises the following steps: mixing the medical stone powder passing through a 80-mesh screen, the diatomite in powder passing through a 80-mesh screen and the zeolite powder passing through a 80-mesh screen with lignite and uniformly stirring the mixture; and mixing the mixture with the fly ash passing through a 80-mesh screen, sufficiently stirring the mixture and after mixing uniformly, preparing the soil heavy metal passivant. The invention has simple preparation method and achieves the effects of passivating the soil heavy metals in the facilities vegetable filed and reducing the content of heavy metals in the soil which can be utilized by the crops by synergistic effect of the components.

Description

technical field [0001] The invention relates to soil improvement technology and environmental protection technology, in particular to a heavy metal passivator for protected vegetable field soil and a preparation method thereof. Background technique [0002] Vegetables are a kind of crops that are easy to accumulate nitrates and heavy metals. In addition to the outstanding problems of pesticide residues, eating hygienic and safe pollution-free vegetables has become the focus of attention. Vegetable heavy metal pollution is mainly related to soil environment and irrigation water quality. Many areas of our country have successively established large-scale demonstration bases for the production of pollution-free vegetables. However, in the process of vegetable production and sales, people attach great importance to the problem of reducing pesticide residues in vegetables. There is still a lack of very effective technical measures to reduce the content of heavy metals in vegetab...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a soil heavy metal passivator and preparation method thereof, which is a simple process, sufficient raw materials, low cost, obvious application effect using medical stone, diatomaceous earth, zeolite, lignite 1. Fly ash is the method for making the heavy metal passivator of facility vegetable field soil as the main raw material, which is used to passivate facility vegetable field soil heavy metals, reduce the content of available heavy metals in crops in the soil, and solve the problem of facility vegetable fields affected by soil heavy metal pollution. The issue of sustainable use

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