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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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3.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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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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5.发明授权Chemical beneficiation of phosphatic limestone and phosphate rock with .alpha.-hydroxysulfonic acids 失效磷酸盐石灰石和磷酸盐岩与α-羟基磺酸的化学选矿
公开(公告)号：UST988006I4
公开(公告)日：1979-11-06
申请号：US940940
申请日：1978-09-11
摘要： A method of selectively extracting calcite and dolomite away from apatite in phosphate rock or phosphatic limestone wherein the phosphate rock or phosphatic limestone is treated with a mixture of sulfur dioxide, water, and a carbonyl compound. Solids are separated from the liquid phase. The solids consist principally of apatite admixed with clay, quartz, and other accessory minerals originally in the rock. The solids are heated to drive off adhering sulfur dioxide, water, and carbonyl. The liquid phase consists of carbonyl, water, sulfur dioxide, and magnesium and calcium ions. Heating this liquid preferentially precipitates CaSO.sub.3.1/2H.sub.2 O. This solid is filtered off and the filtrate further heated to precipitate MgSO.sub.3.3H.sub.2 O largely free of CaSO.sub.3.1/2H.sub.2 O. All offgas and filtrate is returned to the process. Examination of extraction results shows that high temperature extraction favors dolomite extraction and low temperature extraction favors apatite extraction. Thus, operating at elevated temperature allows dolomite to be selectively extracted from the apatite in phosphate rock.
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6.发明授权Chemical beneficiation of phosphatic limestone and phosphate rock with .alpha.-hydroxysulfonic acids 失效磷酸盐石灰石和磷酸盐岩与α-羟基磺酸的化学选矿
公开(公告)号：US4238459A
公开(公告)日：1980-12-09
申请号：US49513
申请日：1979-06-18
摘要： A method of selectively extracting calcite and dolomite away from apatite in phosphate rock or phosphatic limestone wherein the phosphate rock or phosphatic limestone is treated with a mixture of sulfur dioxide, water, and a carbonyl compound. Solids are separated from the liquid phase. The solids consist principally of apatite admixed with clay, quartz, and other accessory minerals originally in the rock. The solids are heated to drive off adhering sulfur dioxide, water, and carbonyl. The liquid phase consists of carbonyl, water, sulfur dioxide, and magnesium and calcium ions. Heating this liquid preferentially precipitates CaSO.sub.3.1/2H.sub.2 O. This solid is filtered off and the filtrate further heated to precipitate MgSO.sub.3.3H.sub.2 O largely free of CaSO.sub.3.1/2H.sub.2 O. All off gas and filtrate is returned to the process.
摘要翻译： 在磷酸盐岩或磷酸盐石灰石中，从磷灰石中选择性提取方解石和白云石的方法，其中用二氧化硫，水和羰基化合物的混合物处理磷酸盐岩或磷酸盐石灰石。 固体与液相分离。 固体主要包括与岩石中的粘土，石英和其他辅助矿物混合的磷灰石。 将固体加热以除去粘附的二氧化硫，水和羰基。 液相由羰基，水，二氧化硫，镁和钙离子组成。 加热该液体优先沉淀CaSO3.1 / 2H2O。 将该固体滤出，滤液进一步加热以沉淀出大部分不含CaSO3.1 / 2H2O的MgSO3.3H2O。 所有废气和滤液都返回过程。
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公开(公告)号：UST970008I4
公开(公告)日：1978-05-02
申请号：US794269
申请日：1977-05-05
申请人： John J. Kohler , Joe Gautney , Yong K. Kim , John F. McCullough
发明人： John J. Kohler , Joe Gautney , Yong K. Kim , John F. McCullough
IPC分类号： B01D53/50
CPC分类号： B01D53/507
摘要： a process for the removal and recovery of sulfur oxides from gas streams by contacting the gas stream with an aqueous suspension of melamine containing an oxidation inhibitor such as para-phenylenediamine whereupon a mixture of solid, hydrated melamine sulfites and solid, hydrated melamine sulfate is formed. The solids are then separated from the reaction product and the clarified liquid recycled. The solids are then heated to temperatures up to 200.degree. C to decompose the hydrated melamine sulfites into free melamine, gaseous water, and sulfur dioxide, and the gaseous water and sulfur dioxide withdrawn as product. The hot solids are cooled and split into two portions. One portion is recycled and the other portion is treated with an aqueous inorganic base stronger than melamine such as ammonia or potassium hydroxide to decompose the contained melamine sulfate into free melamine and a basic sulfate salt solution. The basic sulfate salt solution is separated from the melamine and withdrawn as product and the melamine is recycled to the process.
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公开(公告)号：US4139597A
公开(公告)日：1979-02-13
申请号：US850784
申请日：1977-11-11
申请人： John J. Kohler , Joe Gautney , Yong K. Kim , John F. McCullough
发明人： John J. Kohler , Joe Gautney , Yong K. Kim , John F. McCullough
CPC分类号： B01D53/507
摘要： A process for the removal and recovery of sulfur oxides from gas streams by contacting the gas stream with an aqueous suspension of melamine whereupon a mixture of solid, hydrated melamine sulfites, hydrated melamine sulfate is formed. The solids are separated from the reaction product and the clarified liquid recycled. The solids are then heated to temperatures up to 200.degree. C. to decompose the hydrated melamine sulfites into free melamine, gaseous water, and sulfur dioxide, and the gaseous water and sulfur dioxide withdrawn as product. The hot solids are cooled and split into two portions. One portion is recycled and the other portion is treated with a base stronger than melamine to decompose the contained melamine sulfate into free melamine and a basic sulfate salt solution. The basic sulfate salt solution is separated from the melamine and withdrawn as product and the melamine is recycled to the process.
摘要翻译： 通过使气流与三聚氰胺的水悬浮液接触来形成从气流中除去和回收硫氧化物的方法，由此形成固体，水合三聚氰胺三聚氰胺硫酸盐的混合物。 将固体与反应产物分离，再循环澄清液体。 然后将固体加热至高达200℃的温度，以将水合的三聚氰胺亚硫酸盐分解成游离三聚氰胺，气态水和二氧化硫，并将气态水和二氧化硫作为产物取出。 将热固体冷却并分成两部分。 一部分被再循环，另一部分用比三聚氰胺更强的碱处理以将含有的三聚氰胺硫酸盐分解成游离三聚氰胺和碱式硫酸盐溶液。 将碱性硫酸盐溶液与三聚氰胺分离并作为产物取出，并将三聚氰胺再循环至该方法。
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公开(公告)号：US4308048A
公开(公告)日：1981-12-29
申请号：US121184
申请日：1980-02-13
CPC分类号： C05B13/06
摘要： Embodiment No. 1. Urea phosphate prepared from wet-process phosphoric acid is heated with monopotassium orthophosphate in a mole ratio of 0.25 to 4.0 at 130.degree. to 200.degree. C. to form an ammonium potassium polyphosphate having an average chain length between 1.2 and 2.5. The ammonium potassium polyphosphate is dissolved in aqueous ammonia to yield concentrated fertilizer solutions containing the three major nutrients and over 50 percent total plant food.Embodiment No. 2. Phosphoric acid containing 54 to 76 percent P.sub.2 O.sub.5 is heated with urea (urea:H.sub.3 PO.sub.4 mole ratio 0.5 to 2.0) and monopotassium orthophosphate (urea:KH.sub.2 PO.sub.4 mole ratio 0.25 to 4.0) at 130.degree. to 200.degree. C. to form an ammonium potassium polyphosphate having an average chain length between 1.2 and 2.5. The ammonium potassium polyphosphate is dissolved in aqueous ammonia to yield concentrated fertilizer solutions containing the three major nutrients and over 50 percent total plant food.
摘要翻译： 实施例1：由湿法磷酸制备的磷酸尿素在130〜200℃下以0.25〜4.0的摩尔比与正磷酸单钾一起加热，形成平均链长为1.2〜2.5的多磷酸铵钾 。 将多磷酸铵钾溶解在氨水中，得到含有三种主要营养素和超过50％总植物食物的浓缩肥料溶液。 实施例2：在130〜200℃下，将含有54〜76％的P2O5的磷酸与尿素（尿素：H 3 PO 4的摩尔比为0.5〜2.0）和一磷酸一钾（尿素:KH 2 PO 4的摩尔比为0.25〜4.0）加热，形成 平均链长为1.2〜2.5的多磷酸铵钾。 将多磷酸铵钾溶解在氨水中，得到含有三种主要营养素和超过50％总植物食物的浓缩肥料溶液。
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公开(公告)号：US4239739A
公开(公告)日：1980-12-16
申请号：US91853
申请日：1979-11-06
CPC分类号： C01B25/28
摘要： Purified diammonium phosphate is produced by neutralizing relatively pure melamine orthophosphate, prepared from wet-process phosphoric acid, with ammonia in a hot solution of diammonium phosphate to give a slurry of melamine in concentrated diammonium phosphate solution. The liberated melamine is virtually insoluble in concentrated diammonium phosphate solutions; it is filtered from the hot mixture, washed, and recycled to produce more melamine phosphate by reaction with wet-process phosphoric acid. The hot, concentrated diammonium phosphate filtrate is cooled to precipitate purified diammonium phosphate crystals. The product is separated from its mother liquor by filtration, and the resulting filtrate is recycled to the reactor. The small amount of impurities introduced with the melamine phosphate are removed partly with the liberated melamine and partly by centrifugation of the diammonium phosphate solution. The only starting materials for the process are phosphoric acid and ammonia.
摘要翻译： 纯化的磷酸氢二铵是通过在磷酸氢二铵的热溶液中中和相对纯的正磷酸三氢钙（由湿式磷酸制备）与氨，在浓磷酸氢二铵溶液中中和三聚氰胺浆液而制得的。 释放的三聚氰胺实际上不溶于浓缩的磷酸二氢铵溶液; 从热混合物中过滤，洗涤并再循环以通过与湿法磷酸反应产生更多的三聚氰胺磷酸盐。 将热浓缩的磷酸氢二铵滤液冷却以沉淀纯化的磷酸二氢铵晶体。 通过过滤将产物与其母液分离，并将所得滤液再循环至反应器。 与三聚氰胺三聚氰胺一起引入的少量杂质被释放的三聚氰胺部分地去除，并且部分地通过离心磷酸二铵溶液去除。 该方法的唯一原料是磷酸和氨。
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