Abstract:Acid leaching separation of asbestos tailings to prepare a series of high-purity silicon-magnesium compound powder materials is an important way of high-value utilization of asbestos tailings, but the acid leaching solution of asbestos tailings mainly contains Mg2+, as well as contains impurities such as Fe3+, Fe2+ and so on. The high magnesium acid filtrate after roasting and acid leaching of asbestos tailings was used as raw material,and ammonia water was used as neutralizer to precipitate iron in the filtrate. The concentration of iron ion in the filtrate was determined by spectrophotometry, the phase and structure of precipitated products were analyzed by XRD and FT-IR. The results show that under the conditions including pH value of 4.5, reaction temperature of 80 ℃, and reaction time of 10 min, the sediment is mainly composed of goethite and jarosite, removal rate of iron is 99.71%, loss rate of magnesium is only 3.39%, and filtration rate of suspension is 3.46 mL/min. The product filtration performance is good.