Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkali metal
Patent
1975-06-17
1977-05-03
Vertiz, O. R.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkali metal
23302T, 423206T, 423421, C01D 700
Patent
active
040215261
ABSTRACT:
In the process of making sodium carbonate from trona by the method involving crushing the trona, calcining it and dissolving it in an aqueous medium for purification by crystallization, soluble silicate contamination of the crystallization liquor is reduced by an improvement which involves: (a) segregating the calcined trona into a coarse and a fine fraction; (b) separately dissolving the coarse and fine fractions to obtain aqueous solutions of sodium carbonate, sodium silicates and insoluble impurities; (c) optionally adding to the solution of the fine fraction insoluble impurities which have been separated from a solution of such fine fraction in a previous operation; followed by (d) digesting the solution of the fine fraction containing added insolubles at elevated temperature to insolubilize soluble silicates and separating the digested solution from insoluble impurities.
REFERENCES:
patent: 3869538 (1975-03-01), Sproul et al.
patent: 3870780 (1975-03-01), Guptill
Gancy Alan B.
Poncha Rustom P.
Allied Chemical Corporation
Fuchs Gerhard H,.
Langel Wayne A.
Rooney Gerard P.
Vertiz O. R.
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