METHOD OF PRODUCING AND RECYCLING ARSENIC ADSORBING MATERIALS FROM LATERITE

摘要

The invention proposes a method of producing a laterite based adsorption material for removing arsenic from drinking water. The laterite is heated for denaturation and than surface - activated to improve the adsorption capacity of the material. The adsorption material can be recycled many times in a recycling method and arsenic is collected in the form of calcium arsenate salt. The method of production of the laterite based adsorption material includes the following steps: calcinating laterite for denaturating at a temperature of 900 - 950°C, grinding and sizing the grains, soaking the grains in acid, neutralizing by NaOH, washing out soluble ions, drying and collecting the surface-activated laterite grains as arsenic adsorption material.