Characteristics of Pollutants by Rare Earth Mine Decomposition/Purification Process, and of Treatment Technology

摘要: In this study, it was observed that the characteristics of pollutants produced during processes ore dressing and purification depends on properties rare earth deposits from natural resources. The commercially important minerals discerned in study were ion adsorption deposit, carbonate bastnasite phosphate monazite. process for deposit elution done by use ammonium sulfate calcination, while monazite smashing/grinding, gravity/magnetic separation flotation. decomposition/separation is mainly adopted rare-earth oxide acid/alkali, P507 ()/oxalicacid () carbonation calcination. At process, dominant water heavy metals, fluoride, sulphate, arsenic, radioactive compounds, generally harmful gases (HF, , CO), tailings wastewater with ammonium, materials (Th, U), organic pollutants. Harmful specifically generated acid/alkali decomposition originated separation/purification process. To treat wastewater, chemical precipitation could be applied to remove metal, fluoride stripping struvite treated ions, oxidation compounds.