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为了利用高镁磷矿制得符合18-46-0 DAP要求的原料磷酸,进行了磷酸浓缩过程中脱镁的探索性试验,选用(NH4)2SiF6为脱镁沉淀剂。介绍影响脱镁率的主要因素(沉淀系统P2O5浓度、温度、沉淀剂的用量、沉淀时间)及沉淀浊相的过滤条件。试验达到优惠条件运转的技术经济指标为:浓缩磷酸w(P2O5)50.39%,脱镁率47.42%,M.E.R 0.0744,浓酸经24 h沉降,w(固)为0.23%,符合DAP原料酸的品质要求。
In order to make raw phosphoric acid that meets the requirements of 18-46-0 DAP by using high magnesium phosphate rock, an exploratory test of magnesium removal during phosphoric acid concentration was conducted. (NH4) 2SiF6 was chosen as magnesium removal precipitator. The main factors affecting the magnesium removal rate (concentration of P2O5 in sedimentation system, temperature, dosage of precipitant, settling time) and the filtration conditions of precipitated turbidity were introduced. The technical and economic indexes for the operation under favorable conditions were as follows: concentrated phosphoric acid w (P2O5) 50.39%, magnesium removal rate 47.42%, MER 0.0744, concentrated acid settled 24 h, w (solid) 0.23% Claim.