Clay minerals have a strong adsorption capacity for heavy metal ions, which is attributed to the 3 characteristics of the clay minerals: surface charge, structure and high specific surface area. The adsorption of clay minerals, including selective and non selective adsorption, non selective adsorption is the electrostatic interaction, and the permanent charge of the clay minerals. Clay minerals usually have a certain net negative charge, according to the principle of neutral, there will be an equal amount or approximate amount of the cation is adsorbed on the clay mineral layer or surface to reach the electric balance. Because of the high specific surface area of the structure and high specific surface area of clay minerals, it is highly efficient.

FH-502 by clay minerals and plant extracts instead of material composition, mineral materials after full purification and modification, the harmful heavy metals in water, especially with selective adsorption of lead, chromium, cadmium and other elements, trace amounts of heavy metals by adsorption from water crawl out, so the treatment of electroplating wastewater hexavalent chromium is very effective. This product make full use of the mineral characteristics, path of electroplating wastewater gets rid of the chemical reduction precipitation method, using natural green mineral materials solutions, has a very broad application prospects.