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1. 发明授权

US5250274A Process for the production of sodium dichromate 失效
标题翻译：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。

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