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公开(公告)号：US5068015A
公开(公告)日：1991-11-26
申请号：US393733
申请日：1989-08-15
申请人： Hans-Dieter Block , Norbert Lonhoff , Bernd Makowka , Helmut Klotz , Rainer Weber , Bernhard Spreckelmeyer
发明人： Hans-Dieter Block , Norbert Lonhoff , Bernd Makowka , Helmut Klotz , Rainer Weber , Bernhard Spreckelmeyer
CPC分类号： C25B1/22
摘要： A process for the production of chromic acid by the multistage electrolysis of dichromate and/or monochromate solutions in two-compartment electrolysis cells, of which the anode and cathode compartments are separated by cation exchanger membranes, at temperatures in the range from 50.degree. to 90.degree. C., the dichromate and/or monochromate solutions being obtained by the digestion of chrome ores and leaching, the improvement wherein, optionally after the removal of aluminum, vanadium and other impurities, the monochromate solution obtained after leaching is adjusted at 20.degree. to 110.degree. C. to a pH value of from 8 to 12 by the addition and/or in situ formation of carbonate in a quantity of from 0.01 to 0.18 mol/l (for 300 to 500 g/l Na.sub.2 CrO.sub.4, converted with CO.sub.2 under pressure into a dichromate-containing solution, the dichromate-containing solution is introduced into the anode compartment of the electrolysis cell, a solution containing chromic acid, in which the molar ratio of Na ions to chromic acid is from 0.45:0.55 to 0.30:0.70, is electrolytically produced and the chromic acid is worked up by crystallization, washing and drying.
摘要翻译： 通过在两室电解池中的重铬酸盐和/或单色溶液的多级电解生产铬酸的方法，其中阳极和阴极室由阳离子交换膜分离，温度范围为50至90℃ ℃，通过铬矿和沥滤的消解获得的重铬酸盐和/或单色溶液，其中任选地在除去铝，钒和其它杂质之后，将浸出后获得的单色溶液调节至20℃至 通过加入和/或原位形成量为0.01至0.18mol / l的碳酸盐（对于300至500g / l的Na 2 CrO 4，在压力下用CO 2转化），将pH值为8至12 将含有重铬酸盐的溶液引入电解槽的阳极室中，将含有铬酸的溶液与Na离子的摩尔比 欧米酸为0.45:0.55-0.30:0.70，经电解生产，铬酸通过结晶，洗涤和干燥处理。
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公开(公告)号：US5505918A
公开(公告)日：1996-04-09
申请号：US314553
申请日：1994-09-28
申请人： Uwe Arndt , Michael Batz , Rainer Bellinghausen , Hans-Dieter Block , Heinrich Helker , Norbert Lonhoff , Hans-Heinrich Moretto , Hans-Georg Nieder-Vahrenholz , Hans Rinkes , Bernhard Spreckelmeyer , Rainer Weber
发明人： Uwe Arndt , Michael Batz , Rainer Bellinghausen , Hans-Dieter Block , Heinrich Helker , Norbert Lonhoff , Hans-Heinrich Moretto , Hans-Georg Nieder-Vahrenholz , Hans Rinkes , Bernhard Spreckelmeyer , Rainer Weber
CPC分类号： C01G37/14
摘要： A method for manufacturing alkali chromates by the reacting of chromium ore with alkali compounds and oxidation in an atmosphere containing at least 50% oxygen is described, in which the mixture consisting of chromium ore, alkali compound and optionally leaning materials is heated in a first stage in an atmosphere containing not more than 5 vol. % oxygen to a temperature between 1000.degree. and 1 400.degree. C., and in a second stage is oxidized at a lower temperature of 900.degree. to 1 070.degree. C. with supply of an atmosphere containing at least 50% oxygen.
摘要翻译： 描述了通过铬矿与碱性化合物的反应并在含有至少50％的氧的气氛中进行氧化来制造碱铬酸盐的方法，其中由铬矿，碱化合物和任选的倾斜材料组成的混合物在第一阶段中被加热 在不超过5体积的气氛中。 氧气的氧气温度在1000-400℃之间，第二阶段在900℃至110℃的较低温度下被氧化，同时供给含有至少50％氧气的气氛。
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公开(公告)号：US5667759A
公开(公告)日：1997-09-16
申请号：US690420
申请日：1996-07-26
申请人： Rainer Bellinghausen , Heinrich Helker , Paul Strehlow , Hans-Heinrich Moretto , Bernhard Spreckelmeyer , Norbert Lonhoff , Michael Batz , Rainer Weber , Hans Rinkes , Hans-Dieter Block , Uwe Arndt
发明人： Rainer Bellinghausen , Heinrich Helker , Paul Strehlow , Hans-Heinrich Moretto , Bernhard Spreckelmeyer , Norbert Lonhoff , Michael Batz , Rainer Weber , Hans Rinkes , Hans-Dieter Block , Uwe Arndt
CPC分类号： C01G37/14
摘要： A method for the decomposition of chromium ore in a directly heated revolving tube is described, in which oxygen-containing gases are introduced into the revolving tube by means of below-bed nozzles.
摘要翻译： 描述了在直接加热的旋转管中分解铬矿的方法，其中含氧气体通过下床喷嘴引入回转管中。
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公开(公告)号：US5250274A
公开(公告)日：1993-10-05
申请号：US824682
申请日：1992-01-21
申请人： Norbert Lonhoff , Bernhard Spreckelmeyer , Hans-Dieter Block , Rainer Weber , Jost Halstenberg , Bernd Rosenow
发明人： Norbert Lonhoff , Bernhard Spreckelmeyer , Hans-Dieter Block , Rainer Weber , Jost Halstenberg , Bernd Rosenow
CPC分类号： C01G37/14
摘要： The invention relates to a process for the production of sodium dichromate and sodium dichromate solutions by oxidative roasting of chrome ores under alkaline conditions, leaching of the furnace clinker obtained with water or an aqueous chromate-containing solution, adjustment of the pH to from 7 to 9.5, removal of the insoluble constituents by filtration, a sodium monochromate solution being obtained, conversion of the monochromate ions of this solution into dichromate ions by acidification and crystallization of sodium dichromate by concentration of this solution, characterized in that the acidification is carried out with carbon dioxide under pressure with removal of sodium hydrogen carbonate, the remaining solution is then very largely freed from sodium monochromate by cooling to a temperature below 10.degree. C. and filtration, any monochromate ions still present in the remaining solution are converted into dichromate ions by addition of an acid and the sodium monochromate filtered off is added to the sodium monochromate solution before conversion with carbon dioxide into a sodium dichromate solution.
摘要翻译： 本发明涉及一种通过在碱性条件下对铬矿进行氧化焙烧生产重铬酸钠和重铬酸钠溶液的方法，用水或含铬酸盐水溶液浸取得到的炉渣，将pH调节至7至 9.5，通过过滤除去不溶性成分，得到单色钠溶液，通过浓缩该溶液酸化并重结晶重铬酸钠，将该溶液的单色离子转化为重铬酸根离子，其特征在于酸化是用 二氧化碳在压力下除去碳酸氢钠，剩余的溶液然后通过冷却到低于10℃的温度非常大地从单色钠中除去并过滤，剩余溶液中仍然存在的任何单色离子被转化成重铬酸根离子 加入酸和过滤的单色钠 在将二氧化碳转化成重铬酸钠溶液之前，将f加入到单色钠溶液中。
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5.发明授权Process for the production of alkali dichromates and chromic acid employing an anode of valve metal activated by electrodepositing noble metals from melts 失效使用通过从熔体中电沉积贵金属而活化的阀门金属的阳极来生产碱性重铬酸盐和铬酸的方法
公开(公告)号：US4981573A
公开(公告)日：1991-01-01
申请号：US392873
申请日：1989-08-11
申请人： Helmut Klotz , Rainer Weber , Hans-Dieter Block , Norbert Lonhoff
发明人： Helmut Klotz , Rainer Weber , Hans-Dieter Block , Norbert Lonhoff
CPC分类号： C25B1/22
摘要： A process for the production of alkali dichromates and chromic acid by electrolysis of alkali monochromate or alkali dichromate solutions wherein the anodes used in the electrolysis are dimensionally stable anodes of valve metals activated by electrodeposition of noble metals and/or noble compounds from melts containing noble metal salts.
摘要翻译： 通过电解碱性单色酸盐或碱性重铬酸盐溶液来生产碱性重铬酸盐和铬酸的方法，其中用于电解的阳极是通过从含有贵金属的熔体电沉积贵金属和/或贵金属而活化的阀金属的尺寸稳定的阳极 盐。
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6.发明授权Process for the preparation of alkali metal dichromates and chromic acid by electrolysis 失效通过电解制备碱金属重铬酸盐和铬酸的方法
公开(公告)号：US5127999A
公开(公告)日：1992-07-07
申请号：US713625
申请日：1991-06-10
摘要： A process for the preparation of alkali metal dichromates and/or chromic acid by electrolysis of alkali metal monochromate and/or alkali metal dichromate solution in electrolysis cells, the anode and cathode compartments of which are separated by cation exchange membranes, wherein the cation exchange membranes are single-layer membranes based on perfluorinated polymers having sulfonic acid groups as cation exchange groups, and an aqueous solution having a pH of 4 to 14 is produced in the cathode compartment of the cells.
摘要翻译： 一种通过在电解池中电解碱金属单色和/或碱金属重铬酸盐溶液来制备碱金属重铬酸盐和/或铬酸的方法，其阳极和阴极室由阳离子交换膜分离，其中阳离子交换膜 是基于具有磺酸基作为阳离子交换基团的全氟化聚合物的单层膜，并且在电池的阴极室中产生pH为4至14的水溶液。
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7.发明授权
公开(公告)号：US5094729A
公开(公告)日：1992-03-10
申请号：US659435
申请日：1991-02-22
CPC分类号： C25B1/22
摘要： A process for the preparation of alkali metal dichromates and chromic acid by the electrolysis of monochromate and/or dichromate solutions in an electrolytic cell in which the anode and cathode chamber are separated by a cation exchanger membrane anolyte fluid containing dichromate and/or chromic acid being formed in the anode chamber and alkaline catholyte fluid containing alkali metal ions being formed in the cathode chamber, the improvement wherein the catholyte fluids are periodically replaced by a solution which is at a pH below 6.
摘要翻译： 通过在电解池中电解单色和/或重铬酸盐溶液来制备碱金属重铬酸盐和铬酸的方法，其中阳极室和阴极室由含有重铬酸盐和/或铬酸的阳离子交换膜阳极电解液分离， 形成在阳极室中，并且在阴极室中形成含有碱金属离子的碱性阴极电解液，其中阴极电解液周期性地被pH低于6的溶液所取代。
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8.发明授权
公开(公告)号：US5051155A
公开(公告)日：1991-09-24
申请号：US632417
申请日：1990-12-21
CPC分类号： C25B1/22
摘要： A process for the preparation of alkali metal dichromates and chromic acid by the electrolysis of monochromate and/or dichromate solutions in an electrolytic cell in which the anode and cathode chambers are separated by cation exchange member, the improvement wherein the formation of deposits on the membrane is prevented comprising continuously introducing a solution containing chromate at a pH of about 3 to 10 into the cathode chamber during the electrolysis.
摘要翻译： 通过在阳极交换构件中分离阳极室和阴极室的电解池中电解单色和/或重铬酸盐溶液来制备碱金属重铬酸盐和铬酸的方法，其中在膜上形成沉积物 可防止在电解过程中将含有约3〜10的pH的铬酸盐溶液连续引入阴极室。
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9.发明授权Dimensionally stable anodes and their use in the preparation of alkali metal dichromates and chromic acid 失效尺寸稳定的阳极及其在制备碱金属重铬酸盐和铬酸中的应用
公开(公告)号：US5128000A
公开(公告)日：1992-07-07
申请号：US680602
申请日：1991-04-01
申请人： Helmut Klotz , Rainer Weber , Norbert Lonhoff , Hans-Dieter Block
发明人： Helmut Klotz , Rainer Weber , Norbert Lonhoff , Hans-Dieter Block
CPC分类号： C25B1/22 , C25B1/14 , C25B11/0478
摘要： A dimensionally stable anode comprised ofa) an electrically conductive valve metalb) a conductive intermediate layer andc) an electrode coating of an electrocatalytically active substance, wherein the intermediate layer comprises one or more noble metals or their alloys which have been applied to the valve metal by deposition by electroplating from melts containing noble metal salts. This anode can be used in the production alkali metal dichromates and chromic acid by electrolysis of alkali metal monochromate and/or alkali metal dichromate solutions.
摘要翻译： 一种尺寸稳定的阳极，包括a）导电阀金属b）导电中间层和c）电催化活性物质的电极涂层，其中所述中间层包含一种或多种贵金属或其合金，其被施加到 通过从含有贵金属盐的熔体中电镀而沉积阀门金属。 该阳极可以通过电解碱金属单色和/或碱金属重铬酸盐溶液来生产碱金属重铬酸盐和铬酸。
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公开(公告)号：US5071522A
公开(公告)日：1991-12-10
申请号：US663031
申请日：1991-02-25
CPC分类号： C25B1/22
摘要： A process for the preparation of chromic acid by the electrolysis of dichromate and/or monochromate solutions in electrolytic cells in which the anode chamber and the cathode chamber are separated by a cation exchanger membrane, the improvement wherein the chromic acid content of the solution in the anode chamber is periodically increased above that of a continuous operating state.
摘要翻译： 通过在阳极室和阴极室被阳离子交换膜分离的电解池中电解重铬酸盐和/或单色溶液来制备铬酸的方法，其中溶液的铬酸含量在 阳极室周期性地增加到高于连续工作状态的阳极室。
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