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1. 发明授权

US4485078A Process for producing wet process phosphoric acid from phosphate rocks containing fluochlorapatite and related minerals 失效
标题翻译：含氟氯磷灰石及相关矿物磷酸盐岩生产湿法磷酸的工艺
公开(公告)号：US4485078A
公开(公告)日：1984-11-27
申请号：US471421
申请日：1983-03-08
申请人： Charles W. Weston , John W. Wen , Frederick S. Mandel
发明人： Charles W. Weston , John W. Wen , Frederick S. Mandel
IPC分类号： C01B25/225 , C01B25/238 , C01B25/16
CPC分类号： C01B25/225 , C01B25/238
摘要： Phosphoric acid is produced by the wet process from phosphate rock containing fluochlorapatite. The rock is ground in a crusher (10) to a size such that from about 50% to about 90% by weight will be passed by a -200 mesh U.S.S. sieve before being passed into a digestor (14) where it is mixed with sulfuric acid and recycled phosphoric acid to form a slurry. A suitable reductant such as sulphur dioxide is added to the slurry to maintain the oxidation-reduction potential in the range from about +150 mv to about +750 mv. The gypsum by-products are then removed from the slurry at filter (16) and a portion of the acid is recycled to digestor (14). The remaining acid is either concentrated and further processed to make fertilizers or is further processed via path (20) to remove aluminum and/or iron impurities. Select amounts of fluoride and sodium containing compounds are added to the acid in a stirred reactor (30) to cause precipitation of aluminum, principally as Na.sub.2 AlF.sub.5. After about 15 to about 60 minutes of stirring at a temperature below about 70.degree. C., the precipitate is removed at filter (32) where the acid is either processed to make fertilizer or subjected to additional processing to remove iron contaminants. Iron contaminants are removed from the filter acid or from aluminum removed acid from filter (32) by adding sufficient ammonia to the acid in a stirring reactor (40) to cause precipitation of iron principally as NH.sub.4 Fe.sub.2 H.sub.8 (PO.sub.4).sub.5.AH.sub.2 O, to reduce the level of iron to desired levels. After aging in the reactor from about 2 to about 24 hours at a temperature below the boiling point of the acid, the precipitate is removed at filter (42) and the resulting iron reduced acid is concentrated and subjected to conventional processing for making fertilizers.
摘要翻译：磷酸由含氟氯磷灰石的磷酸盐岩由湿法生产。将岩石在破碎机（10）中研磨成一定尺寸，使得约50％至约90％重量将通过-200目的U.S.S. 筛，然后通入消化器（14），在其中与硫酸和再循环的磷酸混合形成浆料。将适当的还原剂如二氧化硫加入到浆料中以将氧化还原电位维持在约+ 150mv至约+ 750mv的范围内。然后在过滤器（16）从浆料中除去石膏副产物，将一部分酸再循环至消化器（14）。将剩余的酸浓缩并进一步加工以制备肥料，或通过路径（20）进一步加工以除去铝和/或铁杂质。在搅拌的反应器（30）中，将选择量的氟化物和含钠化合物加入到酸中，导致铝沉淀，主要为Na 2 AlF 5。在低于约70℃的温度下搅拌约15至约60分钟后，在过滤器（32）处除去沉淀物，其中酸被处理以制备肥料或进行额外处理以除去铁污染物。通过在搅拌的反应器（40）中向酸中加入足够的氨以使铁主要沉淀为NH 4 Fe 2 H 8（PO 4）5.A·H 2 O，从过滤器（32）中除去铁污染物或从过滤器（32）中除去的铝去除酸，以减少铁水平达到所需水平。在低于沸点的温度下在反应器中老化约2至约24小时后，在过滤器（42）处除去沉淀物，并将所得的铁还原酸浓缩并进行常规加工以制备肥料。

2. 发明授权

US5236679A Removal of aluminum contamination during production of phosphoric acid 失效
标题翻译：在磷酸生产过程中去除铝污染
公开(公告)号：US5236679A
公开(公告)日：1993-08-17
申请号：US879254
申请日：1992-05-06
申请人： John W. Wen , Charles W. Weston
发明人： John W. Wen , Charles W. Weston
IPC分类号： C01B25/225
CPC分类号： C01B25/225
摘要： This invention provides a method for removing aluminum contamination from phosphoric acid during the acidulation of phosphate rock with sulfuric acid in the presence of recycled phosphoric acid. The method of this invention involves the addition of acid soluble silica to the acidulation slurry and calls for maintaining the molar ratio of non-fluosilicate fluoride (i.e. fluoride not complexed with silica) to aluminum in the liquid phase of the acidulation slurry between 2.5 and 5.0. These conditions favor the precipitation of aluminum as calcium tetrafluoaluminate dihydrate and enable the co-removal of this compound by filtration with by-product gypsum. This invention is particularily suitable for the processing of phosphate rocks with high iron and aluminum contents, such as the nonsedimentary phosphate rocks occurring in Sri Lanka.
摘要翻译：本发明提供一种在再循环磷酸存在下用硫酸酸化磷酸盐岩时，从磷酸中除去铝污染的方法。本发明的方法涉及向酸化浆料中加入酸溶性二氧化硅，并要求在酸性浆液的液相中保持2.5至5.0之间的非氟硅酸盐氟化物（即，与二氧化硅不络合的氟化物）与铝的摩尔比。这些条件有利于铝作为四氟铝酸钙二水合物的沉淀，并且能够通过用副产物石膏过滤来共同去除该化合物。本发明特别适用于加工具有高铁和铝含量的磷酸盐岩，如斯里兰卡发生的非磷酸盐岩。

3. 发明授权

US4722832A Sulfur recovery process 失效
标题翻译：硫回收过程
公开(公告)号：US4722832A
公开(公告)日：1988-02-02
申请号：US900633
申请日：1986-08-27
申请人： Charles W. Weston , John W. Wen
发明人： Charles W. Weston , John W. Wen
IPC分类号： C01B17/027 , C01B17/42 , C01B17/033
CPC分类号： C01B17/027 , C01B17/42
摘要： A process for the recovery of sulfur from sulfur-bearing ores employing an aqueous leaching solution containing calcium monosulfide, calcium hydrosulfide or mixtures of such calcium sulfide species. The sulfur ore is contacted in an extraction zone with the aqueous leaching solution under conditions to solubilize sulfur from the ore in the form of calcium polysulfide. Preferably, the extraction step is carried out at an elevated temperature. The loaded leaching solution is recovered from the extraction zone and applied to a sulfur-production zone. Here the loaded solution is contacted with hydrogen sulfide under conditions to react the hydrogen sulfide with the calcium polysulfide to produce calcium hydrosulfide and elemental sulfur. The calcium hydrosulfide solution is recycled for use as leaching solution in the sulfur extraction zone.
摘要翻译：使用含有单硫化钙，硫氢化钙或这种硫化钙物质的混合物的含水浸出溶液从含硫矿石中回收硫的方法。使硫矿石在提取区域与含水浸出溶液接触，条件是以多硫化钙的形式从矿石中溶解硫。优选地，提取步骤在升高的温度下进行。加载的浸出溶液从萃取区回收并施加到硫生产区。在这里，将负载的溶液与硫化氢接触，以使硫化氢与多硫化钙反应以产生硫氢化钙和元素硫。硫酸氢钙溶液被再循环用作硫提取区的浸出溶液。

4. 发明授权

US4325927A Purified monoammonium phosphate process 失效
标题翻译：纯化磷酸二氢铵工艺
公开(公告)号：US4325927A
公开(公告)日：1982-04-20
申请号：US214991
申请日：1980-12-10
申请人： Charles W. Weston , John W. Wen
发明人： Charles W. Weston , John W. Wen
IPC分类号： C01B25/28
CPC分类号： C01B25/28
摘要： A method of producing purified monoammonium phosphate from wet process phosphoric acid and ammonia is provided. The ammoniation takes place in two stages, the acid being ammoniated in the first stage to a pH between about 1.5 and 2.5. This mixture is allowed to age after which the mixture is ammoniated to a pH between about 4 and 5. An impurity-containing precipitate is formed in the first and second stages of ammoniation that is easily filterable from the monoammonium phosphate solution derived from the second ammoniation stage.
摘要翻译：提供了一种从湿法磷酸和氨生产纯化的磷酸二氢铵的方法。氨化发生在两个阶段，酸在第一阶段被氨化到约1.5和2.5之间的pH。使该混合物老化，之后将混合物氨化至约4至5的pH。在氨化的第一和第二阶段中形成含杂质的沉淀物，其易于从源自第二次氨化的磷酸二氢铵溶液过滤阶段。

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