Production of low sulphur chromium (III) oxide
    1.
    发明授权
    Production of low sulphur chromium (III) oxide 失效
    生产低硫(III)氧化物

    公开(公告)号:US4235862A

    公开(公告)日:1980-11-25

    申请号:US968588

    申请日:1978-12-11

    IPC分类号: C01G37/02 C01G37/033

    CPC分类号: C01G37/02 C01P2006/80

    摘要: A process for the production of low sulphur chromium(III) oxide comprising annealing at a calcining temperature from about 800.degree. C. to 1100.degree. C. a mixture of alkali metal chromate and about 0.7 to 0.96 times its molar amount of ammonium sulfate, and separating the chromium(III) oxide formed from the alkali metal salt. Advantageously the ammonium sulfate in the form of a concentrated solution is mixed with solid alkali metal dichromate and the mixture thereafter is adjusted prior to calcination to a water concentration of less than about 15% by weight of water.

    摘要翻译: 一种用于生产低硫(III)氧化物的方法,包括在煅烧温度为约800℃至1100℃下退火碱金属铬酸盐和约0.7至0.96倍摩尔量的硫酸铵的混合物,以及 分离由碱金属盐形成的氧化铬(III)。 有利地,将浓缩溶液形式的硫酸铵与固体碱金属重铬酸盐混合,然后在煅烧之前将混合物调节至水浓度小于约15重量%的水。