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1.发明授权Preparation of dicalcium phosphate from phosphate rock by the use of sulfur dioxide, water, and carbonyl compounds 失效通过使用二氧化硫，水和碳化合物从磷酸盐岩中制备磷酸氢钙
公开(公告)号：US4113842A
公开(公告)日：1978-09-12
申请号：US779038
申请日：1977-03-18
CPC分类号： C01F11/48 , C01B25/324
摘要： A method of preparing dicalcium phosphate from phosphate rock wherein the rock is treated with a mixture of water, carbonyl, and sulfur dioxide. Solids are separated from the liquid phase. The solid phase consists of a mixture of gangue, and calcium .alpha.-hydroxysulfonate. Carbonyl and part of the sulfur dioxide are recovered from the solid by low temperature thermal decomposition. Dicalcium phosphate is precipitated from the liquid phase by partial distilling of SO.sub.2. All carbonyl is recovered for recycle.
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2.发明授权Preparation of dicalcium phosphate from phosphate rock by the use of sulfur dioxide, water, and carbonyl compounds 失效通过使用二氧化硫，水和羰基化合物从磷酸盐岩制备磷酸二钙
公开(公告)号：UST962001I4
公开(公告)日：1977-09-06
申请号：US730210
申请日：1976-10-06
CPC分类号： C01F11/48 , C01B25/324
摘要： dicalcium phosphate is prepared from phosphate rock by a process which comprises reacting phosphate rock with sulfur dioxide and an organic carbonyl compound for 0.5 to 10 hours while maintaining the temperature of the reaction mixture below 50.degree. C. The reaction yields a mixture of gangue, solid calcium .alpha.-hydroxy sulfonate and soluble dicalcium phosphate. The solids are separated from the liquid and P.sub.2 O.sub.5 values adhering to the solid are washed free with a mixture of carbonyl, water, and sulfur dioxide. The wash effluent is recycled to the process and both carbonyl and some sulfur dioxide are recovered from the filter cake by heating it. The offgas from the heated filter cake is recycled to the process and the dry filter cake, now largely calcium sulfite hemihydrate, is discarded.Dicalcium phosphate is precipitated from the reaction mixture filtrate in high yield by partially distilling sulfur dioxide from the filtrate. The precipitated anhydrous dicalcium phosphate is separated from the liquid and dried. Offgas from this drying process as well as both distillate and filtrate is returned to the process. Thus, the only starting materials consumed in the process are phosphate rock and sulfur dioxide. All carbonyl is recovered for recycle.
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公开(公告)号：UST970007I4
公开(公告)日：1978-05-02
申请号：US781216
申请日：1977-03-25
IPC分类号： C01B25/234 , C22B60/02
CPC分类号： C22B60/026 , C01B25/234
摘要： a method of recovering uranium from wet-process phosphoric acid wherein the acid is treated with a mixture of an ammonium salt or ammonia, a metallic reducing agent such as iron, aluminum or zinc, and then a miscible solvent such as methanol. The precipitated solids, which are separated from the purified phosphoric acid, consist of a mixture of metal phosphates and uranium. This solid is dissolved in acid and the uranium recovered from the solution by liquid-liquid solvent extraction. The miscible solvent and some water are distilled away from the purified phosphoric acid. The distillate is rectified, the water discarded, and the miscible solvent recovered for recycle.When the miscible solvent is methanol, the optimum ranges of ammonia and methanol are 0.05 to 0.20 gram atom nitrogen per gram atom phosphorus and 1.93 to 3.15 pounds methanol per pound of orthophosphoric acid. The amount of reducing agent added should be sufficient to reduce all uraniun to U(IV). Under these conditions, >99 percent of the uranium is precipitated from the wet-process acid. About 90 percent of the phosphorus in the acid is recovered as purified phosphoric acid.
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公开(公告)号：US4180545A
公开(公告)日：1979-12-25
申请号：US827517
申请日：1977-08-25
IPC分类号： C01B25/234 , C01B25/46 , C22B60/02 , C01G43/00
CPC分类号： C22B60/0282 , C01B25/234 , C01B25/462 , C22B60/026 , Y02P10/212
摘要： A method of recovering uranium from wet-process phosphoric acid wherein the acid is treated with a mixture of an ammonium salt or ammonia, a reducing agent, and then a miscible solvent. Solids are separated from the phosphoric acid liquid phase. The solid consists of a mixture of metal phosphates and uranium. It is washed free of adhering phosphoric acid with fresh miscible solvent. The solid is dried and dissolved in acid whereupon uranium is recovered from the solution. Miscible solvent and water are distilled away from the phosphoric acid. The distillate is rectified and water discarded. All miscible solvent is recovered for recycle.
摘要翻译： 从湿法磷酸中回收铀的方法，其中用铵盐或氨，还原剂，然后混合溶剂的混合物处理酸。 固体与磷酸液相分离。 固体由金属磷酸盐和铀的混合物组成。 用新鲜的可混溶的溶剂洗涤不含粘附的磷酸。 将固体干燥并溶解在酸中，由此从溶液中回收铀。 从磷酸中蒸馏除去溶剂和水。 馏出物被整顿，水被丢弃。 回收所有可混溶的溶剂。
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