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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：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：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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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：US4150102A
公开(公告)日：1979-04-17
申请号：US873036
申请日：1978-01-27
CPC分类号： C01B7/195 , B01D53/1456 , C01B7/191
摘要： A process for the production of highly pure concentrated hydrofluoric acid by purifying crude HF gas containing H.sub.2 O, SO.sub.2, SiF.sub.4, S,CaF.sub.2, H.sub.2 SO.sub.4 and CaSO.sub.4 and obtained in the reaction of fluorite and sulphuric acid, whereby the resultant HF has an H.sub.2 SO.sub.4 content of the order of a few ppm, there are substantially no deposits of CaSO.sub.4 in the first H.sub.2 SO.sub.4 washing circuit and the service life of the system is considerably lengthened.
摘要翻译： 通过纯化含有H 2 O，SO 2，SiF 4，S，CaF 2，H 2 SO 4和CaSO 4并在萤石和硫酸的反应中获得的粗HF HF气体来生产高纯度浓氢氟酸的方法，由此得到的HF具有H 2 SO 4含量 在几ppm的数量级，在第一个H2SO4洗涤回路中基本上没有CaSO4沉积物，并且系统的使用寿命显着延长。
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公开(公告)号：US4078047A
公开(公告)日：1978-03-07
申请号：US755902
申请日：1976-12-30
CPC分类号： C01B7/192
摘要： In the reaction of phosphate-containing fluorspar with sulphuric acid to produce gaseous hydrofluoric acid, withdrawing the hydrofluoric acid and condensing it, the improvement which comprises adding to the fluorspar a reactive iron compound in an amount approximately equivalent to the phosphate content whereby the phosphate content of the condensed hydrofluoric acid is markedly diminished. The reactive iron compound can be contained in another fluorspar which is blended in the first fluorspar in the requisite amount and/or it can be an iron oxide, fluoride or sulphate, or a hydrated or hydratable iron compound added to the phosphate-containing fluorspar in about 0.2 to 5% by weight calculated as Fe.sub.2 O.sub.3 content and based on the fluorspar.
摘要翻译： 在含磷酸盐的氟石与硫酸的反应中，产生气态氢氟酸，取出氢氟酸并使其冷凝，其改进包括加入与磷酸盐含量大致相当的量的活性铁化合物，由此磷酸盐含量 的浓缩氢氟酸显着降低。 活性铁化合物可以包含在另一个氟石中，其以必需量混合在第一氟石中，和/或其可以是氧化铁，氟化物或硫酸盐，或加入到含磷酸盐的氟石中的水合或可水合的铁化合物 约0.2至5重量％，以Fe 2 O 3含量计，基于氟石。
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公开(公告)号：US4010245A
公开(公告)日：1977-03-01
申请号：US596050
申请日：1975-07-15
摘要： In the production of hydrofluoric acid and calcium sulfate by subjecting sulfuric acid and fluorspar to a partial preliminary reaction in a preliminary reaction zone and the reaction is completed in an after-reaction zone at a temperature from about 100.degree. to 500.degree. C, the improvement which comprises effecting the preliminary reaction by circulating preliminary reaction product through said preliminary reaction zone, adding to the circulating preliminary reaction product at spaced locations in the preliminary reaction zone sulfuric acid preheated to a temperature of about 80.degree. to 200.degree. C and fluorspar preheated to a temperature of about 400.degree. to 800.degree. C, removing from said preliminary reaction zone gaseous hydrofluoric acid and a substantially dry mixture of calcium sulfate, unreacted sulfuric acid and fluorspar, and passing said dry mixture of calcium sulfate, unreacted sulfuric acid and fluorspar to said after-reaction zone. Only some of the necessary sulfuric acid may be supplied to the preliminary reaction zone and the balance supplied to the after-reaction zone. Heating of the preliminary reaction zone can be external or materials can be added which will react exothermically, e.g. SO.sub.3 to react with water in the system, CaO to react with sulfuric acid. A suitable apparatus is provided, comprising two parallel troughs connected at their ends by overflows and with oppositely rotating screws to circulate the contents. Means are provided for introducing reactants at spaced locations and for removing a mixture of product plus unreacted starting materials.
摘要翻译： 在通过在预反应区中进行硫酸和氟化物部分预反应的氢氟酸和硫酸钙的生产中，反应区域在约100-500℃的温度下在反应后区域完成， 其包括通过使预反应产物循环通过所述预反应区进行预反应，将预反应区中的间隔位置加入到循环的预反应产物中，硫酸预热至约80℃至200℃的温度，并将氟石预热至 约400-800℃的温度，从所述预反应区除去气态氢氟酸和基本上干燥的硫酸钙，未反应的硫酸和氟石的混合物，并将硫酸钙，未反应的硫酸和氟石的干混合物通入 说后反应区。 可以仅将一些必需的硫酸供应到预反应区，并将余量供给到反应后区。 预反应区的加热可以是外部的，或者可以添加可以放热反应的材料，例如 SO3与体系中的水反应，CaO与硫酸反应。 提供了一种合适的装置，包括两个平行的槽，它们的端部通过溢流和相对旋转的螺钉连接，以使内容物循环。 提供了用于在间隔位置引入反应物并用于除去产物混合物加未反应的起始材料的方法。
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