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1. 发明授权

US4374810A Recovery of fluorine from pond water of wet process phosphoric acid plants and recycling of defluorinated water 失效
标题翻译：从湿法磷酸厂池塘水中回收氟，脱氟水再循环
公开(公告)号：US4374810A
公开(公告)日：1983-02-22
申请号：US45116
申请日：1979-06-04
申请人： Padraic S. O'Neill
发明人： Padraic S. O'Neill
IPC分类号： C01F11/22 , C02F1/52 , C02F1/58
CPC分类号： C02F1/5236 , C01F11/22 , C02F1/583 , Y10S210/906 , Y10S210/915
摘要： A process for obtaining calcium fluoride from the pond water of phosphoric acid plants and recycling the high phosphate defluorinated water to the pond is disclosed. Sufficient calcium carbonate is added to a solution having a pH of about 0.8, containing about 1% fluoride, 1% phosphate and less than 0.4% sulfate, to raise the pH thereof to 2-3, whereby calcium fluoride is precipitated as a major component, calcium phosphates and calcium sulfates are precipitated as minor components. The calcium fluoride precipitate obtained is washed with raw pond water to reduce the phosphate content and with ammonium carbonate solution to reduce the sulfate content. In this manner an industrially useful fluorspar is obtained. The low fluoride supernatant liquid is then mixed with sufficient raw pond water to bring the pH into the range 1.5-2.0 and the resulting suspension is then held in a lagoon for 5-21 days to permit separation of silica. After separation by sedimentation, the water containing unprecipitated phosphate is returned to the pond for further use. The silica-rich sediment may be further dewatered by centrifugation and used in the phosphoric acid plant to promote better recovery of fluoride. To minimize sulfate contamination of the calcium fluoride product, a separate pretreatment step may be provided to reduce the sulfate content of the pond water to approximately 0.4%. In this step, sufficient calcium carbonate is added to raise the pH of the pond water to about 2.0, and after adequate aging to cause precipitation of calcium sulfate with minimal precipitation of calcium fluoride which precipitates at a higher pH. After pretreatment, the suspension is treated by the first step of the process to remove calcium fluoride.
摘要翻译：公开了一种从磷酸植物的池塘水中获得氟化钙并将高磷酸盐脱氟水再循环到池塘的方法。将足够的碳酸钙加入pH约为0.8的溶液中，含有约1％的氟化物，1％的磷酸盐和小于0.4％的硫酸盐，以将其pH提高到2-3，从而使氟化钙沉淀为主要成分，磷酸钙和硫酸钙作为次要成分沉淀。所得到的氟化钙沉淀物用生的池塘水洗涤以降低磷酸盐含量并用碳酸铵溶液来降低硫酸盐含量。以这种方式获得工业上有用的氟石。然后将低氟上清液与足够的原料池塘水混合以使pH达到1.5-2.0的范围，然后将所得悬浮液在泻湖中保持5-21天，以允许分离二氧化硅。通过沉降分离后，将含有未沉淀磷酸盐的水返回池塘供进一步使用。富含二氧化硅的沉淀物可通过离心进一步脱水，并用于磷酸设备以促进氟化物的更好回收。为了最小化氟化钙产品的硫酸盐污染，可以提供单独的预处理步骤以将池塘水的硫酸盐含量降低至约0.4％。在该步骤中，加入足够的碳酸钙以将池塘水的pH升高至约2.0，并在足够的老化之后使硫酸钙沉淀，同时在较高pH下沉淀出最少的氟化钙沉淀。预处理后，通过该过程的第一步处理悬浮液以除去氟化钙。

2. 发明授权

US4472368A Neutralization of cooling pond water in phosphoric acid plants 失效
标题翻译：在磷酸厂中冷却池塘水中和
公开(公告)号：US4472368A
公开(公告)日：1984-09-18
申请号：US453213
申请日：1982-12-27
申请人： Padraic S. O'Neill , Charles W. Weston , Kyle D. Clevenger , Jesse S. Chang
发明人： Padraic S. O'Neill , Charles W. Weston , Kyle D. Clevenger , Jesse S. Chang
IPC分类号： C01B25/01 , C01D3/02 , C01B25/16 , C01F1/00
CPC分类号： C01B25/01 , Y10S210/915
摘要： An economical process for treating the acidic pond water to be used in the internal grinding circuit of a wet process phosphoric acid plant. Water is added to a quantity of a hydratable calcium compound, such as quicklime, to form a slaked lime slurry. A sufficient quantity of the slaked lime slurry is reacted with the acidic pond water to obtain a low fluoride solution having a fluoride content less than about 300 ppm and a pH in the range from about 2.0 to about 3.0, preferentially in the range 2.6-2.8, whereby calcium fluoride is precipitated. The precipitate bearing low fluoride solution is then clarified and the precipitate removed as underflow from the clarifier and transferred to the gypsum pond. In the preferred embodiment, the clarified low fluoride water is fed to the ball mill and is mixed with the phosphate rock being crushed. Removal of fluoride from the pond water solution reduced the "blinding effect" of the fluoride and permits the calcium carbonate in the phosphate rock to neutralized the acidic pond water to minimize corrosion in the mill and elsewhere in the plant. The resulting slurry from the ball mill is about 55% to 65% solids and ranges in pH range from about 5.0 to about 5.5. The phosphate rock slurry is then passed through a hydroclone circuit where the larger (heavier) particles are removed for recycling to the ball mill and the remaining lightweight particles in the rock slurry are processed by phosphoric acid plant.
摘要翻译：一种用于处理湿法磷酸装置的内部研磨回路中使用的酸性池塘水的经济方法。将水加入一定量的可水合的钙化合物，例如生石灰，以形成熟石灰浆料。将熟化的熟石灰浆料与酸性池塘水反应，得到氟化物含量低于约300ppm，pH在约2.0至约3.0范围内，优选2.6-2.8的氟化物溶液，由此使氟化钙沉淀。然后将含有低氟化物溶液的沉淀物澄清，并从沉淀器中下溢出沉淀物并将其转移到石膏池中。在优选的实施方案中，将澄清的低氟化物水供给到球磨机中，并与被粉碎的磷酸盐岩混合。从池塘水溶液中除去氟化物减少氟化物的“致盲效应”，并允许磷酸盐岩中的碳酸钙中和酸性池塘水，以最大限度地减少磨机和工厂其他地方的腐蚀。来自球磨机的所得浆料为约55％至65％的固体，其范围为约5.0至约5.5的pH范围。然后将磷酸盐岩浆通过水力旋流回路，其中较大（较重）的颗粒被去除以再循环到球磨机中，并且岩浆中剩余的轻质颗粒由磷酸设备处理。

3. 发明授权

US4390509A Process for manufacturing ammonium phosphate utilizing an oxalic acid acidulating process 失效
标题翻译：使用草酸酸化方法制造磷酸铵的方法
公开(公告)号：US4390509A
公开(公告)日：1983-06-28
申请号：US254647
申请日：1981-04-16
申请人： Charles W. Weston , Padraic S. O'Neill
发明人： Charles W. Weston , Padraic S. O'Neill
IPC分类号： C01B25/22 , C01B25/28 , C01F11/18 , C01B15/16 , C01B25/26
CPC分类号： C01B25/2208 , C01B25/28 , C01F11/18
摘要： A process for the manufacture of phosphoric acid from phosphate rock is provided. The phosphate rock is digested or acidulated with an acid solution containing oxalic acid to produce phosphoric acid and calcium oxalate. Useful by-products are also formed and include calcium carbonate and ammonium oxalate. More specifically, the process provides for the production of phosphoric acid, ammonium phosphate and useful by-products utilizing synthesis gas and air to produce oxalic acid and ammonia. The synthesized oxalic acid is utilized for phosphate rock digestion to produce phosphoric acid, which can be reacted with ammonia to produce ammonium phosphate. Calcium oxalate from phosphate rock digestion is utilized to produce calcium carbonate, ammonium oxalate and oxamide.
摘要翻译：提供了一种从磷酸盐岩制造磷酸的方法。用含草酸的酸溶液消化或酸化磷酸盐岩以产生磷酸和草酸钙。还形成有用的副产物，包括碳酸钙和草酸铵。更具体地，该方法提供了使用合成气和空气生产磷酸，磷酸铵和有用的副产物以产生草酸和氨。合成的草酸用于磷酸盐岩石消解，产生磷酸，可与氨反应产生磷酸铵。来自磷酸盐岩石消解的草酸钙用于生产碳酸钙，草酸铵和草酰胺。

4. 发明授权

US4144315A Production of hydrogen fluoride 失效
标题翻译：生产氟化氢
公开(公告)号：US4144315A
公开(公告)日：1979-03-13
申请号：US824508
申请日：1977-08-15
申请人： Ralph E. Worthington , Padraic S. O'Neill , Paul F. X. Hackett
发明人： Ralph E. Worthington , Padraic S. O'Neill , Paul F. X. Hackett
IPC分类号： C01B7/19 , C01D3/02
CPC分类号： C01B7/194 , C01B7/193 , C01D3/02
摘要： Hydrogen Fluoride is manufactured from fluorosilicic acid. The fluorosilicic acid is reacted with ammonia to produce aqueous ammonium fluoride and solid silica. The ammonium fluoride is hydrolised in the presence of a mixture of ammonium fluoride and ammonium bifluoride, and the net production of ammonium bifluoride is converted to sodium bifluoride. The sodium bifluoride is decomposed by heating to hydrogen fluoride gas.
摘要翻译：氟化氢由氟硅酸制造。氟硅酸与氨反应产生氟化铵水溶液和固体二氧化硅。在氟化铵和氟化氢铵的混合物存在下，氟化铵被水解，双氟化铵的净产量转化为二氟化钠。通过加热氟化氢气体使二氟化钠分解。

5. 发明申请

US20090308760A1 ELECTROCHEMICAL DISSOLUTION OF CONDUCTIVE COMPOSITES 审中-公开
标题翻译：导电复合材料的电化学解析
公开(公告)号：US20090308760A1
公开(公告)日：2009-12-17
申请号：US11718782
申请日：2005-12-22
申请人： Bin Wei , Padraic S. O'Neill
发明人： Bin Wei , Padraic S. O'Neill
IPC分类号： C25F5/00 , C25F7/00 , C25F7/02
CPC分类号： B23H9/001 , B23K3/08 , C01B32/25 , C01B32/956
摘要： A method and apparatus separates recoverable components (210) from conductive matrix composites (200) for further use or reuse. In an embodiment, the process uses an electrochemical apparatus that includes a cathode (220) and an anode. The conductive composite is electrically connected to the anode, and a non-acidic electrolyte (250) is supplied to an inter-electrode gap between the cathode and the anode.
摘要翻译：一种方法和装置将可回收组分（210）与导电基质复合材料（200）分离，以便进一步使用或再利用。在一个实施方案中，该方法使用包括阴极（220）和阳极的电化学装置。导电性复合体与阳极电连接，将非酸性电解质（250）供给到阴极和阳极之间的电极间间隙。

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