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公开(公告)号：US4917726A
公开(公告)日：1990-04-17
申请号：US263966
申请日：1988-10-26
IPC分类号： C22B34/32
CPC分类号： C22B34/32 , Y10S75/959
摘要： Waste materials containing chromium, such as the sludge resulting from neutralization of chromic acid bleed streams from metal cleaning and plating operations, are (1) rendered innocuous for land fill purposes by heating to temperatures of at least about 700.degree. C. to stabilize the materials for safe disposal and (2) activated by heating to temperatures of about 400.degree. to 500.degree. and the chromium content in the resulting calcine can be recovered by thermite reduction.
摘要翻译： （1）通过加热到至少约700℃的温度对土地填埋目的进行无害化处理，使含有铬的废料（例如中和铬酸流出物所产生的污泥）为稳定材料 用于安全处理和（2）通过加热至约400〜500℃的温度而活化，并且所得到的煅烧物中的铬含量可以通过铝酸盐还原来回收。
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公开(公告)号：US4551314A
公开(公告)日：1985-11-05
申请号：US599127
申请日：1984-04-11
CPC分类号： C22B3/001 , B01D11/0457 , C01G41/003 , Y02P10/234
摘要： A solvent extraction process is provided for transferring metal values from one immiscible liquid phase to another, whereby the two liquid phases are vigorously mixed together in a first mixer under conditions in which one liquid phase is rendered continuous, the mixing being continued to effect complete transfer of metal values, and the mixture then passed to a second mixer and the two phases mixed under conditions in which the other phase is rendered continuous, whereby when the two phases are fed to a settler, the rate of disengagement of the two immiscible liquids is substantially increased.
摘要翻译： 提供了一种溶剂萃取方法，用于将金属值从一个不混溶的液相转移至另一液相，由此两个液相在一个液相连续的条件下在第一混合器中剧烈混合在一起，混合继续进行完全转移 的金属值，然后将混合物送至第二混合器，两相混合，在另一相连续的条件下，当两相进料至沉降器时，两种不混溶液体的脱离速率为 大大增加。
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3.发明授权
公开(公告)号：US4504448A
公开(公告)日：1985-03-12
申请号：US583904
申请日：1984-02-27
CPC分类号： C22B34/36 , B03D1/08 , C22B3/24 , Y02P10/234
摘要： Foaming in the hydrometallurgical treatment of a tungsten-containing aqueous solution due to the presence of carbonaceous organic material impurities, such as flotation reagents, is substantially inhibited by the addition of effective amounts of powdered activated carbon, the carbon with the adsorbed impurities being thereafter separated from the solution by filtering. The activated carbon also protects the solvent extraction circuit from contamination. The method is particularly applicable to slurries of tungsten oxide concentrates during the high temperature, high pressure leaching thereof with sodium carbonate solutions in an autoclave.
摘要翻译： 通过添加有效量的粉末状活性炭，由于存在碳质有机物质杂质（如浮选试剂），在含钨水溶液的湿法冶金处理中发泡，其后吸附的杂质被分离 从解决方案通过过滤。 活性炭还可以保护溶剂萃取回路免受污染。 该方法特别适用于在高压釜中用碳酸钠溶液高温高压浸出的情况下，氧化钨浓缩物的浆料。
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公开(公告)号：US4338287A
公开(公告)日：1982-07-06
申请号：US225912
申请日：1981-01-19
摘要： A process for conditioning a tungsten concentrate containing tungsten as WO.sub.3, sulfur as sulfide, and calcite to fix at least a portion of the sulfur as calcium sulfate by reaction with the calcite, comprises providing a tungsten concentrate having a calcite content such that less than about 15 wt. % calcium sulfate based on the weight of the WO.sub.3 in the concentrate will be formed and heating the concentrate to a temperature of at least about 500.degree. C. in an oxidizing atmosphere to oxidize substantially all the sulfur in the concentrate to provide a conditioned concentrate having a calcium sulfate content less than about 15% based on the weight of the WO.sub.3, whereby the conditioned concentrate can be efficiently leached with alkali metal carbonates or hydroxides and the resulting alkali metal tungstate solution can be effectively treated to recover an ammonium tungstate solution.
摘要翻译： 一种用于将含钨的钨浓缩物作为WO 3，硫作为硫化物和方解石调节以通过与方解石反应固定硫酸钙的至少一部分硫的方法，包括提供具有方解石含量的少于约 15重量％ 将形成基于浓缩物中WO 3的重量的硫酸钙，并在氧化气氛中将浓缩物加热至至少约500℃的温度，以将浓缩物中的所有硫基本上全部氧化，从而提供具有 基于WO 3的重量计，硫酸钙含量小于约15％，由此可以用碱金属碳酸盐或氢氧化物有效地浸出调理的浓缩物，并且可以有效地处理所得的碱金属钨酸盐溶液以回收钨酸铵溶液。
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公开(公告)号：US4963336A
公开(公告)日：1990-10-16
申请号：US412062
申请日：1989-09-25
申请人： Leo W. Beckstead , Tom C. Kearns , Eddie C. Chou
发明人： Leo W. Beckstead , Tom C. Kearns , Eddie C. Chou
IPC分类号： C01G41/00
CPC分类号： C01G41/00
摘要： Directed to a process for producing a tungsten product of enhanced purity from ammonium paratungstate (APT) with a minimum number of processing steps which comprises mixing the APT with an ammonium solution, autoclaving the mixture at a temperature above the boiling point thereof to dissolve the APT and recrystallizing APT from the solution to yield an APT product of enhanced marketability.
摘要翻译： 针对从仲氨酸铵（APT）生产具有增强纯度的钨产品的方法，其中最少数量的加工步骤包括将APT与铵溶液混合，将该混合物在高于其沸点的温度下高压灭菌以溶解APT 并从溶液中重结晶APT产生增强的市场性的APT产品。
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公开(公告)号：US4810303A
公开(公告)日：1989-03-07
申请号：US101456
申请日：1987-09-28
申请人： Guy W. Lussiez , Eddie C. Chou , Leo W. Beckstead
发明人： Guy W. Lussiez , Eddie C. Chou , Leo W. Beckstead
CPC分类号： C09C1/10 , C01G11/02 , C01P2006/60 , C01P2006/80
摘要： Hexagonal cadmium sulfide, a bright yellow pigment useful in high temperature processing, is produced by reacting cadmium sulfate solution with a solution of a soluble sulfide under pressure and at a temperature of about 250.degree. C.
摘要翻译： 通过使硫酸镉溶液与可溶性硫化物溶液在压力下和约250℃的温度下反应来制备六角硫化镉，一种用于高温处理的亮黄色颜料。
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公开(公告)号：US4450144A
公开(公告)日：1984-05-22
申请号：US400539
申请日：1982-07-21
CPC分类号： C22B3/0012 , C01G41/003 , C22B3/0032 , Y02P10/234
摘要： A process for stripping tungsten values from a tungsten-bearing acidic liquid organic phase into a basic aqueous ammoniacal stripping solution comprises mixing the organic phase and the stripping solution with a high-shear mixing device to maximize the pH gradient between the organic phase and the aqueous solution whereby growth of any precipitated ammonium paratungstate crystals is minimized and the dissolution thereof is maximized and to strip the tungsten values from the organic phase into the stripping solution.
摘要翻译： 将钨值从含钨酸性液体有机相中提取到碱性含水氨汽提溶液中的方法包括用高剪切混合装置将有机相和汽提溶液混合，以使有机相和水相之间的pH梯度最大化 任何沉淀的仲钨酸钠晶体的生长被最小化并且其溶解最大化并且将钨值从有机相剥离到剥离溶液中的溶液。
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公开(公告)号：US4351808A
公开(公告)日：1982-09-28
申请号：US225914
申请日：1981-01-19
摘要： A process for the soda ash digestion of scheelite concentrates is provided, the process comprising forming a slurry of a scheelite concentrate in an aqueous sodium carbonate solution and then digesting the slurry in an autoclave at an elevated temperature of at least about 180.degree. C. The concentration of the Na.sub.2 CO.sub.3 solution is substantially inversely correlated to the digestion temperature and substantially directly correlated to the Na.sub.2 CO.sub.3 /WO.sub.3 weight ratio such as to effect the selective dissolution of at least about 95% of the WO.sub.3 in the concentrate and provide a pregnant liquor containing WO.sub.3 while inhibiting substantial dissolution of gangue minerals.
摘要翻译： 提供了一种用于白钨矿浓缩物的纯碱消解的方法，该方法包括在碳酸钠水溶液中形成白钨矿浓缩物的浆料，然后在至少约180℃的升高的温度下在高压釜中消化浆料。 Na 2 CO 3溶液的浓度与消化温度基本上成反比，并且与Na 2 CO 3 / WO 3重量比基本上直接相关，例如使浓缩物中至少约95％的WO 3的选择性溶解，并提供含有WO3 同时抑制脉石矿物的大量溶解。
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公开(公告)号：US4313914A
公开(公告)日：1982-02-02
申请号：US225909
申请日：1981-01-19
IPC分类号： C01G41/00
CPC分类号： C01G41/00
摘要： A calcium tungstate concentrate is produced by slurrying an aqueous sodium tungstate liquor with calcium carbonate at about 130.degree. C. to about 200.degree. C. while providing sufficient carbon dioxide overpressure to convert sodium carbonate in the slurry to sodium bicarbonate, wherein the conversion of sodium tungstate to solid calcium tungstate in the slurry is promoted. The carbon dioxide is then stripped from the slurry, causing the sodium bicarbonate to convert to sodium carbonate, and a calcium tungstate concentrate is filtered from the slurry. The invention is useful in upgrading impure calcium tungstate concentrates.
摘要翻译： 通过在约130℃至约200℃下将钨酸钠水溶液与碳酸钙混合制备钨酸钙浓缩物，同时提供足够的二氧化碳超压以将浆料中的碳酸钠转化为碳酸氢钠，其中钠的转化率 促进了钨酸钙与固体钨酸钙的混合。 然后将二氧化碳从浆料中汽提，使碳酸氢钠转化为碳酸钠，并从浆料中过滤钨酸钙浓缩物。 本发明可用于升级不纯的钨酸钙浓缩物。
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10.发明授权
公开(公告)号：US4490339A
公开(公告)日：1984-12-25
申请号：US577103
申请日：1984-02-06
摘要： A process is provided for recovering molybdenum and tungsten separately from a sulfide cake containing the same along with arsenic as an impurity. The process comprises dissolving essentially all of the tungsten and molybdenum values contained in the cake in a caustic solution containing at least about 5 but not more than about 6 moles of sodium hydroxide per mole of tungsten plus molybdenum contained in the cake, separating insoluble material from the resulting leach solution and then precipitating one metal value from the group consisting of molybdenum and tungsten preferentially from the other.
摘要翻译： 提供了从含有砷的硫化物饼和作为杂质的砷分别回收钼和钨的方法。 该方法包括将包含在滤饼中的基本上所有钨和钼的值溶解在含有至少约5但不超过约6摩尔氢氧化钠的苛性碱溶液中，每摩尔钨加上蛋糕中所含的钼加钼，将不溶物从 所得到的浸出溶液，然后从另一个优先从钼和钨组成的组中沉淀出一个金属值。
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