Method for preparing heavy metal soil remediation material from coal gangue

Abstract

The invention discloses a method for preparing a heavy metal soil remediation material from coal gangue. The method comprises the following steps: S1, raw material testing; S2, raw material crushing;S3, proportioning; S4, mixing; S5, molding; S6, thermal activation; S7, quenching; S8, drying; S9, crushing; S10, amino acid immobilization; and S11, secondary drying. According to the heavy metal soil remediation material, through thermal activation, the activity of powder is high, the powder can be replaced with heavy metal ions, and thus, the heavy metal ions in soil can be removed; active silicate can react with the heavy metal ions in the soil, so that the heavy metal ions are precipitated after being combined with silicate; mesopores and micropores which are generated by thermal activation can be used as carriers of amino acid or guanidinoacetic acid production mother liquor, after the remediation material is applied to the soil, amino acid is chelated with the heavy metal ions to form amino acid chelates, and the amino acid chelates are attached to the surface of the powder, so that the heavy metal ions in the soil are removed.

Description

technical field [0001] The invention relates to the technical field of heavy metal soil restoration, in particular to a method for preparing heavy metal soil restoration materials from coal gangue. Background technique [0002] Coal gangue is a solid industrial waste produced during coal mining and processing, which contains a variety of mineral components. Among them, the content of kaolin and quartz accounts for more than 50%, and may also contain illite, chlorite, muscovite, feldspar, pyrite, siderite, hematite, calcite and other crystal phase minerals. Among them, kaolinite, illite, chlorite, muscovite, and feldspar belong to aluminous clay minerals, all of which have good adsorption properties. The main chemical components of coal gangue include AL2O3, SiO2, CaO, MgO, Fe2O3, K2O and Na2O. The contents of these chemical components fluctuate greatly depending on the geological age and region of the coal seam. [0003] However, in my country, the coal gangue stockpiled ...

AI Technical Summary

Problems solved by technology

The traditional treatment methods of coal gangue are used to make bricks, generate electricity or build roads, and the calorific value of coal gangue in some areas is relatively low, which is not suitable for power generation, such as: Sichuan. Therefore, the problem of coal gangue has seriously affected the Normal operation of coal mine

[0004] With the development of national industrialization, heavy metal discharge inevitably occurs, which leads to soil heavy metal pollution. In heavy metal soil, heavy metals such as nickel and chromium are contained, and nickel and chromium can be chelated with amino acids to form amino acid chelates, but For heavy metal-contaminated soil, it is usually in pieces, so the direct application of amino acids will lead to a large consumption of amino acids, and it is difficult to distribute amino acids evenly, resulting in uneven soil remediation;