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1. 发明授权

US4258007A Feed system for phosphoric acid production with decreased foaming 失效
标题翻译：磷酸生产的进料系统，起泡减少
公开(公告)号：US4258007A
公开(公告)日：1981-03-24
申请号：US866988
申请日：1978-01-05
申请人： F. Michael Gragg , Allen S. Adams
发明人： F. Michael Gragg , Allen S. Adams
IPC分类号： B01D19/02 , B01F1/00 , B01F13/02 , C01B25/22 , C01B25/223 , C01B25/226 , B01J19/18 , C01B25/222
CPC分类号： B01F1/00 , B01D19/02 , B01F1/0005 , B01F13/02 , C01B25/2204 , C01B25/223 , C01B25/226 , Y10T137/3003
摘要： A system for the preparation of phosphoric acid from phosphate rock and sulfuric acid, includes in combination a first reaction vessel containing a first slurry comprising calcium sulfate hemihydrate, monocalcium phosphate and phosphoric acid, a second reaction vessel containing a second slurry comprising calcium sulfate hemihydrate, circulation means including a draft tube disposed centrally in each of said vessels and an agitator positioned axially in each of said vessels within said draft tube, a first conduit interconnecting said first and second reaction vessels for conducting said first slurry from said first reaction vessel to said second reaction vessel, a second conduit interconnecting said vessels for conducting said second slurry from said second reaction vessel to said first reaction vessel, an inlet pipe for introducing phosphate rock and phosphoric acid to said first reaction vessel, and wherein a vent is connected to said inlet pipe to permit escape of gases and, thus, increasing the rate of flow of said phosphate rock and phosphoric acid to said first reaction vessel.
摘要翻译：用于从磷酸盐岩和硫酸制备磷酸的系统包括组合含有包含硫酸钙半水合物，磷酸一钙和磷酸的第一浆料的第一反应容器，含有包含硫酸钙半水合物的第二浆料的第二反应容器，循环装置，包括设置在每个所述容器中心的引流管和在所述引流管内的每个所述容器中轴向定位的搅拌器，将所述第一和第二反应容器互连的第一管道，用于将所述第一浆料从所述第一反应容器导入所述第一反应容器，第二反应容器，将所述容器相互连接的第二导管，用于将所述第二浆料从所述第二反应容器引导到所述第一反应容器，用于将磷酸盐岩和磷酸引入所述第一反应容器的入口管，其中，入口管允许气体逸出，因此，使所述磷酸盐岩和磷酸的流量增加到所述第一反应容器。

2. 发明授权

US4276270A Start-up procedure in producing phosphoric acid by the hemihydrate process 失效
标题翻译：通过半水合法生产磷酸的启动程序
公开(公告)号：US4276270A
公开(公告)日：1981-06-30
申请号：US82258
申请日：1979-10-05
申请人： F. Michael Gragg , James Self
发明人： F. Michael Gragg , James Self
IPC分类号： B01D19/02 , B01F1/00 , B01F13/02 , B01J16/00 , C01B25/22 , C01B25/225 , C01B25/226 , C01F11/46
CPC分类号： C01B25/226 , B01D19/02 , B01F1/0005 , B01F1/0038 , B01F13/0294 , B01J16/00 , C01B25/2204 , C01B25/225
摘要： In a multi-stage, multi-vessel phosphoric acid production system where a first reaction vessel contains a first slurry comprising calcium sulfate hemihydrate, monocalcium phosphate and phosphoric acid and a second reaction vessel contains a second slurry comprising calcium sulfate hemihydrate, sulfuric acid and phosphoric acid, in which the reaction slurry undergoes intra- and inter-vessel circulation, preferably through a draft tube, an improved start-up procedure involves filling the system with heated phosphoric acid having a P.sub.2 O.sub.5 analysis in the range of about 28 to about 38% (e.g. 31%), then feeding phosphate rock to the system, preferably in a separate reaction vessel, while phosphoric acid is recycled from a fourth, filter feed vessel, until the solids content in said slurry is in the range of 25-35% (e.g. about 30%) while the sulfate content in the first vessel is maintained at a negative level (e.g. excess calcium ion) and at a positive level in the second, crystallizer vessel. When the solids content, calcium, and sulfate content are at the proper level (e.g. about 30% solids, -5 to -2% sulfate in the first vessel and +2 to +3% sulfate in the second vessel) the slurry is then transported to a filter and the phosphoric acid is separated from the calcium sulfate hemihydrate.
摘要翻译：在多级多容量磷酸生产系统中，其中第一反应容器含有包含硫酸钙半水合物，磷酸一磷酸钙和磷酸的第一浆料，第二反应容器含有包含硫酸钙半水合物，硫酸和磷酸的第二浆料酸，其中反应浆料经受血管内和血管间循环，优选通过引流管，改进的启动程序包括用具有约28至约38％范围内的P2O5分析的加热磷酸填充系统，（例如31％），然后将磷酸盐岩石送入系统，优选在单独的反应容器中，同时从第四个过滤器进料容器再循环磷酸，直到所述浆料中的固体含量在25-35％（例如约30％），而第二容器中的硫酸盐含量在第二容器中维持在负的水平（例如过量的钙离子），并且在第二容器。当固体含量，钙和硫酸盐含量处于适当水平（例如，约30％固体，第一容器中为-5至-2％硫酸盐，第二容器中为+2至+ 3％硫酸盐时），然后将浆液运送到过滤器，磷酸与半水合硫酸钙分离。

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