公开(公告)号：US5989508A

公开(公告)日：1999-11-23

申请号：US981469

申请日：1998-02-05

申请人： Mohamed Takhim

发明人： Mohamed Takhim

IPC分类号： C02F1/26 ,  B01D3/38 ,  B01D11/04 ,  C01B17/90 ,  C01B17/96 ,  C01B25/22 ,  C01B25/223 ,  C01B25/234 ,  C01F11/46 ,  C07B63/00 ,  C22B3/20 ,  C22B3/44 ,  C01B25/16

CPC分类号： C22B3/20 ,  B01D3/38 ,  C01B17/901 ,  C01B17/96 ,  C01B25/223 ,  C01B25/234 ,  C22B3/44 ,  Y02P10/234

摘要： Method of purification by extraction of at least one substance to be isolated from a liquid medium, comprising an addition to the latter of an organic compound, entrainable by a vapor, which has a molecule with an acidic-basic character in the Lewis sense due to at least one atom of N, O and/or S forming one or more active sites provided with a free electron pair, this pair or these pairs being in resonance with at least one other pair carried by the molecule, this addition being carried out in a quantity sufficient to give rise to a product of an equilibrium reaction between the organic compound and the said at least one substance to be isolated, and sufficient to cause a precipitation of this equilibrium reaction product, a filtration of the precipitate and an entrainment by vapor of the organic compound from the precipitate, with a yield of the substance to be isolated in purified form.

摘要翻译： PCT No.PCT / BE96 / 00066 Sec。 371日期：1998年2月5日 102（e）1998年2月5日PCT PCT 1996年6月21日PCT公布。 出版物WO97 / 00714 日期1997年1月9日通过萃取从液体介质中分离出的至少一种物质进行纯化的方法，其包括向后者中加入可由蒸气夹带的有机化合物，所述有机化合物具有酸性碱性特征的分子 由于至少一个N，O和/或S的原子形成一个或多个具有自由电子对的活性位点的路易斯感，该对或这些对与分子携带的至少一个其它对共振，这一点 加入量足以产生有机化合物与所述至少一种待分离物质之间的平衡反应的产物，并且足以引起该平衡反应产物的沉淀，过滤沉淀物 以及来自沉淀物的有机化合物的蒸气夹带，以纯化形式分离的物质的产率。

公开(公告)号：US4314978A

公开(公告)日：1982-02-09

申请号：US229468

申请日：1981-01-29

申请人： John C. Franklin

发明人： John C. Franklin

IPC分类号： B01J20/24 ,  C01B25/223 ,  C01F11/46 ,  C01B25/16

CPC分类号： C01B25/223

摘要： An improved method for the production of wet process phosphoric acid wherein the addition of relatively small amounts of gelatin to the reaction system substantially increases the filtration rate of the calcium sulphate crystals without adversely affecting the quality of the acid.

摘要翻译： 用于生产湿法磷酸的改进方法，其中向反应体系中加入相对少量的明胶大大增加硫酸钙晶体的过滤速率，而不会不利地影响酸的质量。

公开(公告)号：US4282192A

公开(公告)日：1981-08-04

申请号：US125007

申请日：1980-02-27

申请人： Harold V. Larson

发明人： Harold V. Larson

IPC分类号： C01B25/223 ,  C01F11/46 ,  C01F13/00 ,  C01B25/16

CPC分类号： C01B25/223 ,  C01F11/46 ,  C01F13/00

摘要： Disclosed is a process for producing a calcium sulfate product containing low amounts of radium comprising the steps of:(a) adding at least one sequestering agent to a substantially homogeneous radium-containing monocalcium phosphate (MCP) solution, the amount of the sequestering agent added being at least the stoichiometric amount necessary to complex with the radium in the MCP solution;(b) reacting the treated MCP solution with H.sub.2 SO.sub.4 to form a monocalcium phosphate/phosphoric acid solution, to precipitate a first calcium sulfate product, and to precipitate at least a portion of the radium, the amount of said H.sub.2 SO.sub.4 being up to about 50% of the stoichiometric amount necessary to react with the total CA.sup.++ present in the MCP solution;(c) separating the monocalcium phosphate/phosphoric acid solution from the radium-containing calcium sulfate precipitate;(d) then reacting the monocalcium phosphate/phosphoric acid solution with H.sub.2 SO.sub.4 to form a phosphoric acid solution and to precipitate a second calcium sulfate product, the amount of the H.sub.2 SO.sub.4 added being at least sufficient to react with substantially all of the CA.sup.++ present in the monocalcium phosphate/phosphoric acid solution; and(e) separating the phosphoric acid from the second calcium sulfate product.

摘要翻译： 公开了一种生产含有少量镭的硫酸钙产品的方法，包括以下步骤：（a）将至少一种螯合剂加入到基本均匀的含镭磷酸一钙（MCP）溶液中，加入多价螯合剂的量 至少是与MCP溶液中的镭复合所需的化学计量量; （b）使经处理的MCP溶液与H 2 SO 4反应以形成磷酸一钙/磷酸溶液，以沉淀第一种硫酸钙产物，并沉淀至少一部分镭，所述H 2 SO 4的量高达约50％ 与MCP溶液中存在的总CA ++反应所需的化学计量量; （c）从含镭硫酸钙沉淀物中分离磷酸一钙/磷酸溶液; （d）然后使磷酸一钙/磷酸溶液与H 2 SO 4反应以形成磷酸溶液并沉淀第二种硫酸钙产物，所加入的H 2 SO 4的量至少足以与存在于 磷酸一钙/磷酸溶液; 和（e）从第二硫酸钙产物中分离出磷酸。

公开(公告)号：US4277448A

公开(公告)日：1981-07-07

申请号：US909899

申请日：1978-05-26

申请人： Fernando Ore ,  John D. Ellis ,  James H. Moore

发明人： Fernando Ore ,  John D. Ellis ,  James H. Moore

IPC分类号： B01J16/00 ,  C01B25/223 ,  C01B25/225 ,  C01F11/46 ,  C01B25/22

CPC分类号： B01J16/00 ,  C01B25/223 ,  C01B25/225

摘要： Phosphoric acid is prepared from phosphate rock and sulfuric acid by using a reaction train comprising a dissolving slurry and a crystallization slurry maintained at different sulfate levels. Both inter and intra vessel circulation are used at high rates to minimize reagent concentration gradients and temperature gradients and provide a suitable crystallization environment. Preferably, the intra vessel circulation is substantially in plug flow, as through a draft tube.

摘要翻译： 通过使用包含溶解浆料和维持在不同硫酸盐水平的结晶浆料的反应系，由磷酸盐岩和硫酸制备磷酸。 以高速率使用血管内和血管内循环以最小化试剂浓度梯度和温度梯度，并提供合适的结晶环境。 优选地，血管内循环基本上是流动的，如通过引流管。

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。

公开(公告)号：US4086322A

公开(公告)日：1978-04-25

申请号：US608973

申请日：1975-08-29

申请人： Erhart K. Drechsel

发明人： Erhart K. Drechsel

IPC分类号： C01B33/10 ,  C01B25/18 ,  C01B25/22 ,  C01B25/223 ,  C01B25/234 ,  C01B25/30 ,  C01B25/32 ,  C01B25/46 ,  C01F11/22 ,  C01F11/46 ,  C05D9/02 ,  C01B25/16

CPC分类号： C01B25/003 ,  C01B25/01 ,  C01B25/185 ,  C01B25/22 ,  C01B25/223 ,  C01B25/234 ,  C01B25/30 ,  C01B25/303 ,  C01B25/328 ,  C01B25/46 ,  C01F11/22 ,  C05D9/02

摘要： A method is disclosed for the acidulation of phosphate rock and the production of substantially pure alkali metal phosphates, calcium phosphates, and phosphoric acid which are essentially free of fluorides and recovery of the fluorine values from the starting phosphate rock in useful form. The steps of the method comprise initial acidulation of phosphate rock with a phosphoric acid solution containing sufficient alkali metal values to provide R.sub.2 O in the system, where R is alkali metal, to solubilize the phosphates and form an insoluble precipitate comprising a mixture of impurities, sand (SiO.sub.2) and the fluorides, from which the fluorides can be recovered in usable form. In preferred embodiments, after removal of the precipitate containing the fluorides, a portion of the solution of phosphoric acid and calcium phosphate is reacted with sulfuric acid and RHSO.sub.4 or R.sub.2 SO.sub.4 where R is alkali metal, to form a solution of RH.sub.2 PO.sub.4 and phosphoric acid and at least a portion of the RH.sub.2 PO.sub.4 and phosphoric acid solution is recycled to the initial acidulation to provide the R.sub.2 O and phosphoric acid makeup. The remainder of the solution of calcium phosphate and phosphoric acid may be further processed for recovery of useful products such as monocalcium phosphate and/or dicalcium phosphate, phosphoric acid, alkali metal phosphates, and calcium sulfate.

摘要翻译： 公开了一种用于磷酸盐岩的酸化和基本上不含氟化物的基本上纯的碱金属磷酸盐，磷酸钙和磷酸的生产方法，并以有用的形式从原料磷酸盐岩中回收氟值。 该方法的步骤包括用含有足够碱金属值的磷酸溶液初始酸化磷酸盐岩，以在R为碱金属的体系中提供R 2 O，以溶解磷酸盐并形成不溶性沉淀，其包含杂质，砂 （SiO 2）和氟化物，氟化物可以从其中以可用形式回收。 在优选的实施方案中，在除去含有氟化物的沉淀物之后，将一部分磷酸和磷酸钙溶液与硫酸和RHSO 4或R 2 SO 4反应，其中R是碱金属，形成RH2PO4和磷酸的溶液，并在 将至少一部分RH2PO4和磷酸溶液再循环至初始酸化以提供R2O和磷酸的组成。 可以进一步处理磷酸钙和磷酸的其余溶液以回收有用的产物，例如磷酸一钙和/或磷酸二钙，磷酸，碱金属磷酸盐和硫酸钙。

公开(公告)号：US11667528B2

公开(公告)日：2023-06-06

申请号：US17636708

申请日：2020-08-20

申请人： JESA TECHNOLOGIES LLC

发明人： Stephen Wayne Hilakos ,  Anis Lakhouaja

IPC分类号： C01B25/223 ,  C01B25/238 ,  C02F1/28 ,  C02F1/68 ,  C02F101/20 ,  C22B3/42

CPC分类号： C01B25/223 ,  C01B25/238 ,  C02F1/28 ,  C02F1/683 ,  C01P2006/80 ,  C02F2101/20 ,  C22B3/42

摘要： Methods for removing cadmium (Cd) from a phosphoric acid solution produced in a wet process for manufacturing phosphoric acid, comprising treating the wet-process phosphoric acid solution with a small amount of a solid adsorbing material and a complex reagent to form a cadmium complex-contaminated solid adsorbing material, and removing the contaminated solid adsorbing material to yield a treated phosphoric acid solution having a low Cd content.

公开(公告)号：US20150266785A1

公开(公告)日：2015-09-24

申请号：US14729269

申请日：2015-06-03

申请人： Dan Kluesner ,  Darrin Redmond

发明人： Dan Kluesner ,  Darrin Redmond

IPC分类号： C05B17/00

CPC分类号： C05B17/00 ,  C01B25/223 ,  C05F11/02 ,  C05C11/00 ,  C05D1/00

摘要： The disclosed invention relates to novel fertilizing compounds comprising a combination of inorganic fertilizers and humic compounds. The combination produces a marked benefit over either type of substance individually, and also over previously known combinations of organic and inorganic fertilizers. The invention also relates to a method of production of such compounds.

摘要翻译： 所公开的发明涉及包含无机肥料和腐殖化合物的组合的新颖施肥化合物。 这种组合可以单独使用任何一种物质，也可以超过以前已知的有机和无机肥料的组合。 本发明还涉及这种化合物的生产方法。

公开(公告)号：US5185135A

公开(公告)日：1993-02-09

申请号：US743922

申请日：1991-08-12

申请人： Krishnan J. Pillai ,  Lawrence J. Connelly ,  William K. Gustafson

发明人： Krishnan J. Pillai ,  Lawrence J. Connelly ,  William K. Gustafson

IPC分类号： B01D37/02 ,  C01B25/223

CPC分类号： C01B25/223 ,  B01D37/02

摘要： A digested slurry from a wet process phosphoric acid production process is dewatered by gravity-assisted vacuum filtration using as a filtration aid an aqueous solution of a polymeric filtraton aid that has been subjected to high shear mixing to enhance the performance of the filtration aid and enhance the filtration.

摘要翻译： 通过重力辅助真空过滤将来自湿法磷酸生产过程的消化浆料脱水，使用过滤助剂将已进行高剪切混合的聚合物过滤助剂的水溶液提高过滤助剂的性能并增强 过滤。

公开(公告)号：UST105603I4

公开(公告)日：1985-07-02

申请号：US655012

申请日：1984-09-27

申请人： George A. Kennedy ,  James R. Lehr

发明人： George A. Kennedy ,  James R. Lehr

IPC分类号： C01B25/223

CPC分类号： C01B25/223

摘要： Adjustment of the maximum soluble sulfate level in phosphoric acid taken from, for example, an existing, conventional wet-process phosphoric acid production facility prior to reacting same with low purity phosphate rock at a temperature ranging from 45.degree. C. to 65.degree. C. and for a period of time ranging from about 10 minutes to 60 minutes effects selective dissolution of calcium and phosphate values from the rock without incurring high codissolution of aluminum and iron impurities. After separation from the undissolved impurity-containing gangue, the resulting solution of calcium phosphate in phosphoric acid is returned to the conventional wet-process facility for subsequent treatment with sulfuric acid to produce phosphoric acid and calcium sulfate, while the gangue is washed to recover additional phosphate values, and the wash liquor is transported to the conventional facility where it is used to wash the calcium sulfate filter cake.