公开(公告)号：US20060188419A1

公开(公告)日：2006-08-24

申请号：US10549594

申请日：2003-03-19

申请人： Zhikuan Wang ,  Hongbin Xu ,  Huiquan Li ,  Tao Qi ,  Shili Zheng

发明人： Zhikuan Wang ,  Hongbin Xu ,  Huiquan Li ,  Tao Qi ,  Shili Zheng

IPC分类号： C22B34/30

CPC分类号： C01G37/14

摘要： This invention relates to a method for producing chromates, especially for producing alkali metal chromates. The method comprises following steps: the obtaining of a mixture of alkali metal hydroxide, alkali metal chromate, and ferrous residue after the reaction of chromite ore with an oxidant in the reactor in the presence of molten salt or in aqueous solution of alkali metal hydroxide, the obtaining of a leaching slurry by leaching the reaction products with aqueous solution of alkali metal hydroxide, the separating of the primary chromate product from the leaching slurry, the obtaining of pure chromate crystal by purifying the primary chromate product. Both the primary chromate product and the pure chromate crystal can be used as the raw materials to manufacture other chromium compounds. Compared with the currently-used roasting method, the method has the advantages of decreasing the reaction temperature by about 700° C., of improving the chromium recovery rate up to nearly 100%, of minimizing the amount of the ferrous residue by not adding calcium-containing auxiliaries, and of completely eliminating the disposal problem of the chromium-containing residue and the environmental pollution due to the addition of calcium-containing auxiliaries, by using ferrous residue as the raw materials for other industries after extraction of magnesium.

摘要翻译： 本发明涉及生产铬酸盐的方法，特别是生产碱金属铬酸盐。 该方法包括以下步骤：在熔融盐存在下或在碱金属氢氧化物的水溶液中，在铬酸铁矿与氧化剂反应后，获得碱金属氢氧化物，碱金属铬酸盐和亚铁残留物的混合物， 通过将碱金属氢氧化物水溶液浸出反应产物，从浸出浆中分离出一次铬酸盐产物，通过纯化一次铬酸盐产物得到纯的铬酸盐晶体，从而获得浸出浆料。 主要的铬酸盐产物和纯铬酸盐晶体都可以用作制造其他铬化合物的原料。 与目前使用的焙烧方法相比，该方法具有将反应温度降低约700℃，将铬回收率提高至近100％的优点，通过不添加钙来最小化亚铁残留量 并且完全消除了含铬残渣的处理问题，以及由于添加含钙助剂而导致的环境污染，在提取镁后，以铁渣作为其他工业的原料。

公开(公告)号：US07968066B2

公开(公告)日：2011-06-28

申请号：US10549594

申请日：2003-03-19

申请人： Zuohu Li ,  Yi Zhang ,  Shili Zheng ,  Tao Qi ,  Huiquan Li ,  Hongbin Xu ,  Zhikuan Wang

发明人： Zuohu Li ,  Yi Zhang ,  Shili Zheng ,  Tao Qi ,  Huiquan Li ,  Hongbin Xu ,  Zhikuan Wang

IPC分类号： C01G37/14

CPC分类号： C01G37/14

摘要： This invention relates to a method for producing chromates, especially for producing alkali metal chromates. The method comprises following steps: the obtaining of a mixture of alkali metal hydroxide, alkali metal chromate, and ferrous residue after the reaction of chromite ore with an oxidant in the reactor in the presence of molten salt or in aqueous solution of alkali metal hydroxide, the obtaining of a leaching slurry by leaching the reaction products with aqueous solution of alkali metal hydroxide, the separating of the primary chromate product from the leaching slurry, the obtaining of pure chromate crystal by purifying the primary chromate product. Both the primary chromate product and the pure chromate crystal can be used as the raw materials to manufacture other chromium compounds. Compared with the currently-used roasting method, the method has the advantages of decreasing the reaction temperature by about 700° C., of improving the chromium recovery rate up to nearly 100%, of minimizing the amount of the ferrous residue by not adding calcium-containing auxiliaries, and of completely eliminating the disposal problem of the chromium-containing residue and the environmental pollution due to the addition of calcium-containing auxiliaries, by using ferrous residue as the raw materials for other industries after extraction of magnesium.

摘要翻译： 本发明涉及生产铬酸盐的方法，特别是生产碱金属铬酸盐。 该方法包括以下步骤：在熔融盐存在下或在碱金属氢氧化物的水溶液中，在铬酸铁矿与氧化剂反应后，获得碱金属氢氧化物，碱金属铬酸盐和亚铁残留物的混合物， 通过将碱金属氢氧化物水溶液浸出反应产物，从浸出浆中分离出一次铬酸盐产物，通过纯化一次铬酸盐产物得到纯的铬酸盐晶体，从而获得浸出浆料。 主要的铬酸盐产物和纯铬酸盐晶体都可以用作制造其他铬化合物的原料。 与目前使用的焙烧方法相比，该方法具有将反应温度降低约700℃，将铬回收率提高至近100％的优点，通过不添加钙来最小化亚铁残留量 并且完全消除了含铬残渣的处理问题，以及由于添加含钙助剂而导致的环境污染，在提取镁后，以铁渣作为其他工业的原料。