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    Process for the production of sodium dichromate
    3.
    发明授权
    Process for the production of sodium dichromate 失效
    生产重铬酸钠的方法

    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

    IPC分类号： C01G37/14 ,  C01G37/00

    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。

    Electrochemical process for the production of chromic acid
    4.
    发明授权
    Electrochemical process for the production of chromic acid 失效
    电化学工艺生产氯酸

    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

    IPC分类号： C25B1/00 ,  C25B1/22 ,  C25B15/08

    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。

    Process for the preparation of sodium dichromate
    5.
    发明授权
    Process for the preparation of sodium dichromate 失效
    重铬酸钠的制备方法

    公开(公告)号：US5273735A

    公开(公告)日：1993-12-28

    申请号：US980142

    申请日：1992-11-23

    申请人： Rainer Weber ,  Bernd Rosenow ,  Hans-Dieter Block ,  Norbert Lonhoff

    发明人： Rainer Weber ,  Bernd Rosenow ,  Hans-Dieter Block ,  Norbert Lonhoff

    IPC分类号： C01G37/14 ,  C25B1/28

    CPC分类号： C25B1/28 ,  C01G37/14

    摘要： A process for the preparation of sodium dichromate and sodium dichromate solutions by alkaline oxidizing roasting of chromium ores, leaching resulting roast with water, adjustment of the pH to 7 to 9.5, removal of the insoluble constituents by filtration, a sodium monochromate solution containing 300 to 400 g/l of Na.sub.2 CrO.sub.4 being obtained, conversion of the monochromate ions of this solution into dichromate ions by addition of an acid and/or by electrolysis and/or by reaction with carbon dioxide under pressure and crystallization of sodium dichromate by concentration of this solution. The improvement wherein before the conversion into a sodium dichromate solution, the sodium monochromate solution is concentrated to contents of 700 to 1000 g/l of Na.sub.2 CrO.sub.4, the monochromatic ions, the solution is subsequently freed as far as possible from sodium sulphate by cooling to a temperature of below 0.degree. C. and filtration, and the residual monochromate ions which remain in the solution are converted into dichromate ions by electrolysis and/or by reaction with carbon dioxide and/or with chromic acid.

    摘要翻译： 一种通过碱性氧化焙烧铬矿石，用水浸泡，调节pH至7至9.5，通过过滤除去不溶成分的方法制备重铬酸钠和重铬酸钠溶液的方法，将含有300〜 获得400g / l的Na 2 CrO 4，通过加入酸和/或通过电解和/或通过与压力下的二氧化碳反应并通过浓缩该溶液使重结晶的重结晶，将该溶液的单色离子转化为重铬酸根离子 。 改进之前，在转化成重铬酸钠溶液之前，将单色钠溶液浓缩至700至1000g / l Na 2 CrO 4的含量，即单色离子，随后将溶液从硫酸钠中冷却至 温度低于0℃并过滤，留在溶液中的残留单色离子通过电解和/或通过与二氧化碳和/或与铬酸的反应转化为重铬酸根离子。

    Process for the preparation of chromic acid
    7.
    发明授权
    Process for the preparation of chromic acid 失效
    制备色素的方法

    公开(公告)号：US5096548A

    公开(公告)日：1992-03-17

    申请号：US626076

    申请日：1990-12-11

    申请人： Norbert Lonhoff ,  Ludwig Schmidt ,  Hans-Dieter Block ,  Rainer Weber

    发明人： Norbert Lonhoff ,  Ludwig Schmidt ,  Hans-Dieter Block ,  Rainer Weber

    IPC分类号： C25B1/00 ,  B01J47/12 ,  C01G37/033 ,  C25B1/22 ,  C25B15/08 ,  C25C1/10

    CPC分类号： C01G37/033 ,  C25B1/22 ,  C25C1/10

    摘要： A process for the production of chromic acid, comprising(a) dissolving ferrochrome in sulphuric acid and mother liquor from the subsequent crystallization of ammonium chrome alum, optionally with the addition of at least one of catholyte and anolyte overflow from the subsequent electrolysis,(b) removing undissolved constituents by filtration,(c) removing dissolved iron by the addition of at least one of ammonia and ammonium sulphate to the filtrate obtained, crystallizing iron ammonium sulphate and filtering,(d) crystallizing and filtering ammonium chrome alum from the remaining solution and returning the filtrate for dissolving ferrochrome in step (a),(e) dissolving the ammonium chrome alum in water,(f) precipitating and separating chromium-(III) hydroxide from the resulting solution by adding a base, optionally under reducing conditions,(g) dissolving the separated chromium hydroxide in chromic acid and optionally sulphuric acid so that either a single solution in chromic acid is obtained or two solutions are obtained, one in chromic acid and another in sulphuric acid,(h) separating the solution(s) from undissolved constituents, and(i) utilizing the solution of chromium hydroxide in chromic acid as anolyte in the electrolytic production of chromic acid in an electrolytic cell divided by a membrane, and either utilizing the same solution as catholyte in the above mentioned electrolytic cell divided by a membrane or utilizing the solution of chromium hydroxide in sulphuric acid as catholyte in the above mentioned electrolytic cell divided by a membrane, hydrogen and metallic chromium being deposited electrolytically at the cathode and/or chromium (II) ions being produced electrolytically at the cathode.

    摘要翻译： 一种生产铬酸的方法，包括（a）将铬铁铬酸盐和母液从随后的铵铬明矾结晶中溶解，任选地从随后的电解中加入至少一种阴极电解液和阳极电解液溢出物（b ）通过过滤除去未溶解的组分，（c）通过向所得滤液中加入至少一种氨和硫酸铵除去溶解的铁，结晶硫酸铁铵并过滤，（d）从剩余溶液中结晶并过滤铵铬明矾 并在步骤（a）中返回用于溶解铬铁的滤液，（e）将铵铬明矾溶解在水中，（f）通过加入碱（任选在还原条件下）将所得溶液中的铬 - （III） （g）将分离的氢氧化铬溶解在铬酸和任选的硫酸中，使得单一的铬酸溶液 得到两种溶液，一种在铬酸中，另一种在硫酸中，（h）将溶液与未溶解的组分分离，和（i）在电解生产中利用铬酸中的铬酸溶液作为阳极电解液 在由电解槽中分离的膜中的铬酸，或者利用与上述电解槽中的阴极电解液相同的溶液，或者利用氢氧化铬溶液作为阴极电解液，除去上述电解槽 在阴极处电解沉积的阴极和/或铬（II）离子沉积的膜，氢和金属铬。

    Processes for the preparation of alkali metal dichromates and chromic acid
    10.
    发明授权
    Processes for the preparation of alkali metal dichromates and chromic acid 失效
    制备碱金属二铬酸盐和铬酸的方法

    公开(公告)号：US5094729A

    公开(公告)日：1992-03-10

    申请号：US659435

    申请日：1991-02-22

    申请人： Helmut Klotz ,  Hans D. Pinter ,  Rainer Weber ,  Hans-Dieter Block ,  Norbert Lonhoff

    发明人： Helmut Klotz ,  Hans D. Pinter ,  Rainer Weber ,  Hans-Dieter Block ,  Norbert Lonhoff

    IPC分类号： C01G37/14 ,  C25B1/14 ,  C25B1/22

    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。