Purification of wet-process phosphoric acid
    1.
    发明授权
    Purification of wet-process phosphoric acid 失效
    湿法磷酸的纯化

    公开(公告)号:US4769226A

    公开(公告)日:1988-09-06

    申请号:US98702

    申请日:1987-09-18

    摘要: Crude wet-process phosphoric acid is purified by treating a dilute such acid with a molybdenum value reducing amount of hydrogen sulfide or of a sulfide which in situ forms hydrogen sulfide, to afford a purified acid adopted for the production of food grade phosphoric acid, and which has a content in heavy metal and molybdenum values of less than 10 ppm.

    摘要翻译: 通过用减少钼量的硫化氢或原位形成硫化氢的硫化物处理稀释的这种酸来纯化粗制湿法磷酸,得到用于生产食品级磷酸的纯化酸,以及 其重金属和钼的含量低于10ppm。