Abstract: A process based upon solvent extraction has been developed for the recovery of phosphoric acid from a leaching liquor obtained by decomposition of phosphate rock with sulfuric acid. Using Di-n-Butyl Sulfoxide (DBSO) as extractant and multistage counter-current extraction and stripping, pure phosphoric acid or potassium dihydro-gen phosphate can be produced on one hand, and precipipated calcium phosphate on the other. The proportion of both products may be economically adjusted in accordance with varying demands. This process will leave an effluent which is less polluting than any existing process.

摘要： 本文采用二丁基亚砜(DBSO)作为萃取剂,对于用硫酸分解磷矿而得的粗磷酸进行多级逆流萃取及反萃取,以获得高纯度的磷酸和磷酸盐.采用本流程可以利用我国藏量很大的低品位磷矿来制取纯磷酸,用于化肥、轻工、食品等行业.本文中述及的制取磷酸二氢钾(KH_2PO_4 )即为一例.本流程系将部分有效磷变为纯磷酸等优质产品,而余下部分制取普通磷肥或磷酸盐.这不仅在经济上较为有益,而且在解决三废污染方面较现有磷肥工业有所改进.