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1. 发明授权

US4994100A Homogeneous granular nitrogen fertilizer 失效
标题翻译：均匀颗粒氮肥
公开(公告)号：US4994100A
公开(公告)日：1991-02-19
申请号：US292004
申请日：1988-12-29
申请人： Allen R. Sutton , Charles W. Weston , Richard L. Balser
发明人： Allen R. Sutton , Charles W. Weston , Richard L. Balser
IPC分类号： C05C7/02 , C05C9/00 , C05C13/00 , C05G3/08
CPC分类号： C05G3/08 , C05C9/005 , Y02P60/218
摘要： An improved aqueous nitrogen fertilizer has been developed that increases first-year nitrogen uptake efficiency to plants. It is also a nitrogen fertilizer with features to minimize exposure to nitrogen loss. It is a nitrogen fertilizer consisting of urea, dicyandiamide, ammonium thiosulfate, and optionally a phosphate compound which is preferably an ammonium phosphate compound. This composition can contain a dye and/or various mineral micronutrients. This homogeneous granular fertilizer can be applied to a field crop in a single application and is available to the growing plant throughout its growth and maturing cycle. The homogeneous granular fertilizer composition is conveniently prepared by the addition of a dicyandiamide, and a solution of ammonium thiosulfate to molten urea. A phosphate compound and preferably ammonium polyphosphate, would be added along with these components.

2. 发明授权

US5352265A Granular urea-based fertilizer 失效
标题翻译：颗粒状尿素型肥料
公开(公告)号：US5352265A
公开(公告)日：1994-10-04
申请号：US151553
申请日：1993-11-12
申请人： Charles W. Weston , Lawrence A. Peacock , Willis L. Thornsberry, Jr. , Allen R. Sutton
发明人： Charles W. Weston , Lawrence A. Peacock , Willis L. Thornsberry, Jr. , Allen R. Sutton
IPC分类号： C05C9/00
CPC分类号： C05C9/00 , Y10S71/902
摘要： An improved homogenous granular fertilizer composition is disclosed; the composition is comprised primarily of urea, N-(n-butyl)thiophosphoric triamide (NBPT), and dicyandiamide (DCD). The composition of this invention can be applied to a field crop in a single surface application and will nevertheless supply sufficient nitrogen to the plants throughout their growth and maturing cycles. The new improved composition increases the nitrogen uptake by plants, enhances crop yields, and minimizes the loss of both ammonium nitrogen and nitrate nitrogen from the soil.The NBPT is incorporated into the homogenous granular fertilizer composition of this invention by blending a concentrated solution of NBPT in a solvent selected from the group consisting of liquid amides, 2-pyrrolidone, and N-alkyl 2-pyrrolidones directly into molten urea prior to its granulation; the DCD may be added to the urea melt as a solid or in dissolved form along with the NBPT.
摘要翻译：公开了一种改进的均匀颗粒肥料组合物; 该组合物主要由尿素，N-（正丁基）硫代磷酸三酰胺（NBPT）和双氰胺（DCD）组成。本发明的组合物可以在单一表面施用中应用于田间作物，并且在其生长和成熟周期期间将向植物提供足够的氮。新的改进的组合物增加植物的氮吸收，增加作物产量，并最小化来自土壤的铵氮和硝态氮的损失。 NBPT通过将NBPT的浓缩溶液在选自液体酰胺，2-吡咯烷酮和N-烷基2-吡咯烷酮的溶剂中直接掺入到熔融尿素中之前，将NBPT掺入本发明的均匀颗粒肥料组合物中制粒 DCD可以与NBPT一起作为固体或溶解形式加入到尿素熔体中。

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

US5364438A Fluid urea-containing fertilizer 失效
标题翻译：含尿素的肥料
公开(公告)号：US5364438A
公开(公告)日：1994-11-15
申请号：US151280
申请日：1993-11-12
申请人： Charles W. Weston , Lawrence A. Peacock , Willis L. Thornsberry, Jr.
发明人： Charles W. Weston , Lawrence A. Peacock , Willis L. Thornsberry, Jr.
IPC分类号： C05C1/00 , C05G3/00 , C05C9/00
CPC分类号： C05C1/00 , C05G3/0064 , Y10S71/902
摘要： An improved fluid urea-containing fertilizer composition is disclosed; the composition is essentially comprised of an aqueous solution of urea, ammonium nitrate, N-(n-butyl)thiophosphoric triamide (NBPT), dicyandiamide (DCD), and may optionally also contain a clay as a suspending agent. The fluid fertilizer composition can be applied to a field crop in a single application and will nevertheless supply sufficient nitrogen to the plants throughout their growth and maturing cycles. As a result, the improved composition increases the nitrogen uptake efficiency of plants, enhances crop yields, and minimizes the loss of nitrogen from the soil.The NBPT is incorporated into the fluid fertilizer composition by blending a concentrated solution of N-(n-butyl)thiophosphoric triamide in a solvent selected from the group consisting of liquid amides such as an N-alkyl pyrrolidone directly with an aqueous solution of urea and ammonium nitrate, optionally also containing a suspending agent and commonly referred to in the fertilizer trade as UAN; the DCD may be added to the UAN fluid as a solid, a suspension, or in dissolved form along with the NBPT.
摘要翻译：公开了一种改进的含有流体尿素的肥料组合物; 该组合物基本上由尿素，硝酸铵，N-（正丁基）硫代磷酸三酰胺（NBPT），双氰胺（DCD）的水溶液组成，并且还可任选地含有粘土作为悬浮剂。流体肥料组合物可以在单一应用中施用于田间作物，并且将在其生长和成熟周期中向植物提供足够的氮。结果，改进的组合物增加植物的氮吸收效率，增加作物产量，并最小化土壤中氮的损失。 NBPT通过将N-（正丁基）硫代磷酸三酰胺的浓缩溶液在选自由N-烷基吡咯烷酮的液体酰胺直接与尿素水溶液组成的组的溶剂中混合而并入流体肥料组合物中，硝酸铵，任选地还含有悬浮剂，在化肥贸易中通常称为硝酸铵; DCD可以与NBPT一起作为固体，悬浮液或溶解形式加入到UAN流体中。

5. 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。

6. 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。

7. 发明授权

US4704136A Sulfate reduction process useful in coal gasification 失效
标题翻译：硫酸盐还原工艺可用于煤气化
公开(公告)号：US4704136A
公开(公告)日：1987-11-03
申请号：US864281
申请日：1986-05-16
申请人： Charles W. Weston , Frederick S. Mandel
发明人： Charles W. Weston , Frederick S. Mandel
IPC分类号： C01B17/44 , C10J3/00
CPC分类号： C01B17/44 , C10J3/00 , C10J3/482 , C10J2300/0906 , C10J2300/0909 , C10J2300/093 , C10J2300/0943 , C10J2300/0946 , C10J2300/0956 , C10J2300/0959 , C10J2300/0976 , C10J2300/0996 , C10J2300/1668 , C10J2300/1807 , Y10S423/14
摘要： A carbonaceous material, such as coal, is gasified through the catalytic action of an alkali metal salt. The alkali metal is provided as a sulfate which is converted to a sulfide during gasification. In one embodiment, sodium sulfate is converted to sodium sulfide at a temperature effective to form a transitory melt condition at an interface which obtains coal gasification at relatively low temperatures and material residence times for the reaction. An alkaline earth sulfate, such as a gypsum, may be concurrently converted to a sulfide during gasification. The alkali metal sulfide may then be regenerated to a sulfate for process reuse while converting the alkaline earth to a carbonate for environmentally safe disposal with concurrent recovery of valuable sulfur. The evolved carbon gases may be used for fuel, for process feed chemicals, or the like.
摘要翻译：煤等碳质材料通过碱金属盐的催化作用而气化。碱金属以硫酸盐形式提供，在气化过程中转化为硫化物。在一个实施方案中，硫酸钠在有效形成短暂熔融条件的温度下转化为硫化钠，所述界面在相对较低的温度下获得煤气化和反应的物质停留时间。在气化期间，碱土金属硫酸盐如石膏也可以同时转化为硫化物。然后可以将碱金属硫化物再生成硫酸盐，以便过程重复使用，同时将碱土转化为碳酸盐以进行环境安全处置，同时回收有价值的硫。演化的碳气体可用于燃料，加工进料化学品等。

8. 发明授权

US5112499A Process for treating pond water 失效
标题翻译：处理池塘水的方法
公开(公告)号：US5112499A
公开(公告)日：1992-05-12
申请号：US704203
申请日：1991-05-22
申请人： Michael A. Murray , Charles W. Weston
发明人： Michael A. Murray , Charles W. Weston
IPC分类号： C02F1/52 , C02F1/58 , C02F1/66
CPC分类号： C02F1/66 , C02F1/5236 , C02F1/583 , Y10S210/906 , Y10S210/915
摘要： A two-stage process for treating acidic gypsum pond water for reuse or for discharge is disclosed. The first stage blends raw acidic pond water with recycled lime-treated slurry from the second stage of the process. The resulting elevation in pH causes CaF.sub.2 and SiO.sub.2 to precipitate and the precipitated material is discarded onto the gypsum storage area. The supernatant water can be used in the wet grinding mill and/or further treated in a second stage with lime to produce treated water which meets government environment standards for discharge. The slurry of calcium phosphate formed in the second (liming) stage is recycled to the first stage.
摘要翻译：公开了一种用于处理酸性石膏池塘水进行再利用或排放的两阶段方法。第一阶段将原酸性池塘水与再生石灰处理的浆料从该工艺的第二阶段相混合。由此导致的pH升高导致CaF2和SiO2沉淀，沉淀的材料被丢弃到石膏储存区域上。上清液水可用于湿式研磨机，和/或在第二阶段用石灰进一步处理以产生符合政府环境排放标准的处理水。在第二（石灰）阶段中形成的磷酸钙的浆料被再循环到第一阶段。

9. 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。

10. 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。

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