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31. 发明授权

US5653955A Cyclic process for oxidation of calcium sulfide 失效
标题翻译：硫化钙氧化循环过程
公开(公告)号：US5653955A
公开(公告)日：1997-08-05
申请号：US468841
申请日：1995-06-06
申请人： Thomas D. Wheelock
发明人： Thomas D. Wheelock
IPC分类号： B01J20/34 , C01B13/14 , C01B17/50 , C01F11/08 , C01F11/10
CPC分类号： C01B17/508 , C01F11/08 , C01F11/10
摘要： An improved process for converting particles containing calcium sulfide into calcium oxide by subjecting the particles to repeated cycles of oxidation and reduction. The impenetrable layer of calcium sulfate which forms during the oxidation phase of each cycle is destroyed by the subsequent reducing phase. By repeating the cycle many times, the particles are converted completely into calcium oxide at a reasonable temperature of about 1000.degree. C. The process can be carried out in either fixed bed, moving bed, or fluidized bed reactors by varying the composition of the gas supplied to the reactors in a periodic manner. Alternatively, the process can be conducted in fluidized bed reactors which have separate oxidizing and reducing zones located one above the other. In one design air is supplied through a gas distributor at the bottom of the fluidized bed to create an oxidizing zone in the lower part of the bed. A reducing gas is introduced through a second distribution grid located in the mid-region of the bed to create a reducing zone in the upper part of the bed. In another design, the zones are reversed by introducing a reducing gas through the lower gas distributor and an oxidizing gas through the upper distributor. The upper gas distributor is in the form of an open grid of tubing which does not interfere with particle circulation in the fluidized bed. As the particles circulate freely within the bed, they pass through the different zones many times to be repeatedly oxidized and reduced.
摘要翻译：通过使颗粒经历氧化和还原的重复循环，将含有硫化钙的颗粒转化成氧化钙的改进方法。在每个循环的氧化阶段期间形成的硫酸钙不可渗透层被随后的还原相破坏。通过重复该循环多次，颗粒在约1000℃的合理温度下完全转化为氧化钙。该方法可以通过改变气体的组成在固定床，移动床或流化床反应器中进行以周期的方式供应给反应堆。或者，该方法可以在具有位于另一个之上的分离的氧化和还原区的流化床反应器中进行。在一种设计中，空气通过流化床底部的气体分配器供应，以在床的下部产生氧化区。还原气体通过位于床的中间区域的第二配电网导入，以在床的上部产生还原区。在另一种设计中，通过引入还原气体通过下部气体分配器和通过上部分配器的氧化气体来反转这些区域。上部气体分配器是开放的管状网格的形式，其不干扰流化床中的颗粒循环。当颗粒在床内自由循环时，它们多次通过不同的区域，以反复氧化和还原。

32. 发明授权

US4608238A Process for treating phospho-gypsum waste product from wet-acid process of making phosphoric acid 失效
标题翻译：从制造磷酸的湿酸工艺处理磷酸石膏废物的工艺
公开(公告)号：US4608238A
公开(公告)日：1986-08-26
申请号：US634965
申请日：1984-07-27
申请人： Eddie K. Wilson, Sr. , Silvio J. Spigolon
发明人： Eddie K. Wilson, Sr. , Silvio J. Spigolon
IPC分类号： C01B7/19 , C01B17/50 , C01F11/08 , C01F1/00 , C01F5/10
CPC分类号： C01B17/506 , C01B7/191 , C01F11/08
摘要： This disclosure concerns an improved phospho-gypsum recovery process in which phospho-gypsum waste product and coke are first heated to remove moisture, some SO.sub.2 and other vaporous matter, then heated to a higher temperature in a reducing atmosphere to remove and separately recover SO.sub.2, then further heated in an oxidizing atmosphere to about 1200.degree. to 1250.degree. C. to remove any unreacted carbon and calcium sulfide before entering an electric furnace. The disclosure also concerns passing the gas stream from the condenser-heat exchanger over the clinker from the electric furnace to scrub SO.sub.2 from said gas stream. The essence of the invention is the unique absorber system used to remove any and all remaining fluorine in the gases from the calciner/furnace. If not removed, the fluorine will severely harm the catalyst used in the contact sulfuric acid plant to which the gases are sent for recovery of sulfur values. The absorber system uses a sulfuric acid absorber folowed by a water absorber.
摘要翻译：本公开涉及改进的磷石膏回收方法，其中首先加热磷石膏废产物和焦炭以除去水分，一些SO 2和其它气态物质，然后在还原气氛中加热至较高温度以除去并分别回收SO 2，然后在氧化气氛中进一步加热至约1200℃至1250℃，以在进入电炉之前除去任何未反应的碳和硫化钙。本公开还涉及将来自冷凝器 - 热交换器的气流通过熟料从电炉通过来自所述气流的SO 2洗涤。本发明的本质是用于从煅烧炉/炉中除去气体中的任何和所有剩余的氟的独特的吸收系统。如果不去除，氟将严重损害用于回收硫值的气体被接收的硫酸设备中使用的催化剂。吸收器系统使用由吸水器淹没的硫酸吸收器。

33. 发明授权

US3582276A Process for recovering a metal oxide and sulfur dioxide from metal sulfate 失效
标题翻译：从金属硫酸盐中回收金属氧化物和二氧化硫的方法
公开(公告)号：US3582276A
公开(公告)日：1971-06-01
申请号：US3582276D
申请日：1968-07-22
申请人： ELCOR CHEM CORP
发明人： CAMPBELL ROY EDWIN , FISHER EDWIN EDDIE
IPC分类号： C01B17/44 , C01B17/50 , C01F11/08 , C01B17/72
CPC分类号： C01F11/08 , C01B17/44 , C01B17/506 , Y02P20/129
摘要： A METAL SULFATE IS CONVERTED TO A METAL OXIDE AND SULFUR DIOXIDE BY SUBJECTING IT TO A SERIES OF REDUCTION AND OXIDATION STEPS. DURING THE REDUCTION STEPS, THE SULFATE PRESENT IS CONVERTED TO SULFUR DIOXIDE, THE METAL SULFIDE AND THE METAL OXIDE. THE SUBSEQUENT OXIDIZING STEP CONVERTS THE METAL SULFIDE TO SULFUR DIOXIDE, METAL OXIDE, AND A SMALL AMOUNT OF METAL SULFATE. THE SULFUR DIOXIDE IS COLLECTED TO ANY SUITABLE MANNER, AND THE REDUCTION AND OXIDATION SYCLE IS REPEATED UNTIL A METAL OXIDE OF DESIRED PURITY IS OBTAINED.

34. 发明授权

US2232099A Process of decomposing calcium sulphate 失效
标题翻译：硫酸钙分解过程
公开(公告)号：US2232099A
公开(公告)日：1941-02-18
申请号：US29603939
申请日：1939-09-22
申请人： ALAN N MANN
发明人： DE JAHN FREDRIK W
IPC分类号： C01F11/08
CPC分类号： C01F11/08

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