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    • 21. 发明授权
    • Method of complex production of sodium bifluoride, active sodium
fluoride, hydrogen fluoride and potassium nitrate
    • 二氟化钠,活性氟化钠,氟化氢和硝酸钾复合生产的方法
    • US4748015A
    • 1988-05-31
    • US917796
    • 1986-10-10
    • Wladyslaw Augustyn
    • Wladyslaw Augustyn
    • C01B7/19C01D3/02C01D9/06
    • C01D3/02C01B7/191C01B7/194C01D9/06
    • A complex method was developed for the conversion of an ammonium fluoride solution and an ammonium fluoride/potassium fluoride solution into sodium bifluoride, active sodium fluoride and hydrogen fluoride, with potassium nitrate as a co-product and a concentrated solution of ammonium nitrate as a by-product. Quickly settling crystals of sodium bifluoride containing a very small amount of water after centrifugation are obtained with high efficiency from the reaction which occurs during the mixing of a concentrated solution of sodium fluoride in aqueous nitric acid with the ammonium fluoride solution. The by-product of the reaction is a very concentrated solution of ammonium nitrate. Potassium nitrate is precipitated from the ammonium fluoride/potassium fluoride solution after the addition of ammonium nitrate and after cooling. The mother solution formed in the crystalization is applied to the precipitation of sodium bifluoride. The production of hydrogen fluoride and active sodium fluoride takes advantage of the technically known thermal decomposition of sodium bifluoride as obtained according to the invention. Active sodium fluoride and hydrogen fluoride can be produced in different ratios, since either product of the thermal decomposition of sodium bifluoride may be partially applied to the precipitation of additional sodium bifluoride.
    • 开发了一种用于将氟化铵溶液和氟化铵/氟化钾溶液转化为氟化钠,活性氟化钠和氟化氢的复合方法,以硝酸钾为副产物,硝酸铵浓缩溶液为 -产品。 从浓硝酸钠浓缩溶液与氟化铵溶液的混合过程中发生的反应效率高,可快速沉淀离心后含有极少量水的二氟化钠晶体。 反应的副产物是非常浓缩的硝酸铵溶液。 加入硝酸铵后冷却后,硝酸钾从氟化铵/氟化钾溶液中沉淀出来。 在结晶中形成的母溶液适用于氟化钠的沉淀。 氟化氢和活性氟化钠的生产利用了根据本发明获得的技术上已知的氟化钠的热分解。 活性氟化钠和氟化氢可以以不同的比例生产,因为氟化二氢钠的热分解产物可以部分地应用于另外的二氟化钠的沉淀。