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    • 3. 发明授权
    • Production of alkali metal products from alkali metal fluosilicate
    • 从碱金属氟硅酸盐生产碱金属产品
    • US4328196A
    • 1982-05-04
    • US190850
    • 1980-09-25
    • John B. SardiscoErhart K. Drechsel
    • John B. SardiscoErhart K. Drechsel
    • C01B25/30C01B33/18C01D5/00C01D9/00C01F11/22C01D5/02C01D9/04
    • C01D5/00C01B25/301C01B33/186C01D9/00C01F11/22C01P2006/80
    • Alkali metal-containing salt products selected from the group consisting of alkali metal dihydrogen phosphate, alkali metal sulfate, alkali metal nitrate, and mixtures thereof, together with alkaline earth metal fluoride, are produced from alkali metal fluosilicate by the steps of:(a) reacting alkali metal fluosilicate with alkaline earth metal ion in an aqueous solution to form alkali metal hydroxide and solid alkaline earth metal fluoride with SiO.sub.2 ;(b) separating the solid alkaline earth metal fluoride and SiO.sub.2 and recovering as useful products;(c) reacting the remaining alkali metal hydroxide solution with a mineral acid selected from the group consisting of phosphoric acid, sulfuric acid, nitric acid, and mixtures thereof, at a temperature in the range of about 30.degree.-100.degree. C. until the reaction is complete; and(d) recovering the alkali metal-containing product.Also provided by this invention is a continuous system for conducting this reaction whereby mother liquors may be recycled and the acid reused in the process, and wherein mineral acid is recovered from which anhydrous HCl can be produced.
    • 由碱金属氟硅酸盐由碱金属氟硅酸盐制备选自碱金属磷酸二氢盐,碱金属硫酸盐,碱金属硝酸盐及其混合物的碱金属盐产物,其步骤为:(a) 使碱金属氟硅酸盐与碱土金属离子在水溶液中反应,形成碱金属氢氧化物和固体碱土金属氟化物与SiO2; (b)分离固体碱土金属氟化物和SiO 2并作为有用产物回收; (c)将剩余的碱金属氢氧化物溶液与选自磷酸,硫酸,硝酸及其混合物的无机酸在约30℃-100℃的温度下反应,直到 反应完成 和(d)回收含碱金属的产物。 本发明还提供了一种用于进行该反应的连续系统,由此母液可以再循环并且酸在该方法中重复使用,并且其中回收无机酸可从其中产生无水HCl。