Silicate-carbonate composite mineral material, preparation method thereof and application of silicate-carbonate composite mineral material in precipitation of heavy metal ions

Abstract

The invention relates to a silicate-carbonate composite mineral material, a preparation method thereof and application of the silicate-carbonate composite mineral material in precipitation of heavy metal ions. The silicate-carbonate composite mineral material is obtained by mixing, ball-milling and activating silicate mineral powder and carbonate mineral powder. The silicate-carbonate composite mineral material can efficiently fix heavy metal ions such as cadmium and manganese in a wide pH value range, the solid-liquid separation effect can be achieved through short-time standing precipitation, the precipitation effect is remarkable, the use amount is small, operation is convenient, other impurity ions are not introduced, and the silicate-carbonate composite mineral material is environmentally friendly and suitable for industrial production. The pH value of the treated solution is in a weakly alkaline range, acid neutralization treatment is not needed, and the soil remediation agent is suitable for water treatment and heavy metal contaminated soil remediation and can slowly release silicon, magnesium, calcium and other trace / macroelements needed by plant growth in the heavy metal ion fixing process when being used for soil remediation, and the effect of a fertilizer is achieved.

Description

technical field [0001] The invention belongs to the technical field of solution treatment or purification, and in particular relates to a silicate-carbonate composite mineral material, its preparation method and its application in the aspect of precipitating heavy metal ions. Background technique [0002] A large amount of wastewater containing heavy metals is produced in the process of industrial production, and its discharge will lead to the continuous accumulation of heavy metals in the water body and surrounding soil, causing pollution to the ecological environment, and ultimately threatening human health through the transmission of food chains. Therefore, the removal of heavy metals is of great significance for the protection of water bodies and soil ecological environment. [0003] There are many processes for removing heavy metals. Alkali precipitation method is a method widely used in industry at present. It mainly adjusts the alkalinity of water body by adding lime,...

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Problems solved by technology

However, there are certain limitations in this method when dealing with heavy metals. The main problems are as follows: (1) When the amount of alkali is insufficient, the removal effect of heavy metals cannot be guaranteed, but the use of a large amount of alkali causes the water body after treatment to be too alkaline (pH>9), Further acid neutralization treatment is required to meet the discharge requirements, and the process cost increases; (2) The sludge with metal hydroxide as the main component has high water content, large volume, long settling time, and difficult solid-liquid separation. This kind of sludge belongs to hazardous solid waste. During the storage process, the redissolution of some heavy metal ions will also cause secondary pollution.

[0005] In the existing research, the precipitant materials based on the above minerals have not yet achieved effective fixation of heavy metal elements such as cadmium and manganese. This application provides a carbonate-silicate composite mineral material to strengthen its adsorption performance on heavy metals, and prepare And the application process is simple, green and environmentally friendly, which helps to purify the environment. While improving the comprehensive utilization value of non-metallic mineral resources, it is also expected to realize the resource application of related solid waste, which has important industrial application value

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