Environment governance and process optimization of ion-adsorbed rare earth smelting

Emission Standards of Pollutants from Rare Earths Industry has been implemented since October 1, 2011 which puts forward higher standard for wastes emission (waste gas, waste water, waste residue and noise) of rare earth smelting plant. Optimum proposal is presented in accordance with environmental management status quo of an ion-adsorbed rare earth smelting plant in southern China: hydrogen chloride absorptivity of the acid mist absorption tower, as well as the removal efficiency of soot and sulfur dioxide of the water film dust removal installation are improved to optimize waste gas treatment technology; industrial waste water is separately collected, workshop drainage exits of the waste water containing heavy metal, thorium and uranium are governed, and supernatant in oxalic acid precipitation is recycled to optimize waste water treatment technology; waste residue is separately collected and dealt with according to relevant regulation; low noise equipments are preferred and measures, such as noise elimination, sound insulation and damping are taken to treat noise. Relevant monitoring data indicates that waste gas, waste water and noise meet the requirement of emission concentration of Emission Standards of Pollutants from Rare Earths Industry and other related standard. Warehouses are set up to stack low-level radioactive solid wastes which are transported and dealt with by qualified units after accumulating to certain amount, and other waste residues are governed in accordance with relevant administrative measures.