Continuous production of lithium carbonate

Details Continuous production of lithium carbonate Continuous production of lithium carbonate

1977-08-09

1978-11-07

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkali metal

C01D 700

Patent

active

041246845

ABSTRACT:
Lithium carbonate is derived from a calcined lithium-bearing silicate in a continuous cyclic process in which the silicate is decomposed in aqueous medium with sodium carbonate at a selected temperature and pressure, the resulting slurry is cooled and leached with carbon dioxide, and the resulting lithium bicarbonate-bearing soluton is heated to derive lithium carbonate and a mother liquor, which is recycled to the decomposition step. The amount of aqueous liquid used in the decomposition step is reduced to a minimum and the leaching accomplished without further dilution. This results in contamination of the recycled mother liquor with bicarbonate ions, which normally act to inhibit a high yield of lithium carbonate. The process conditions are controlled to reduce this inhibiting effect. Preferably, this control is effected by selecting a relatively low reaction temperature accompanied by neutralizing the mother liquor. Less desirably, the control is effected by selecting a relatively higher temperature and regulating it closely.

REFERENCES:
patent: 2331838 (1943-10-01), Lindblad et al.
patent: 3073673 (1963-01-01), Chubb
patent: 3112170 (1963-11-01), Archambault et al.
patent: 3112171 (1963-11-01), Archambault
Ellestad et al., "Extraction of Lithium from its Ores," Transactions AIME, (Nov. 1955), Mining Engineering, pp. 1045-1047.
Jacobson, Encyclopedia of Chemical Reactions, vol. VI, (1956), p. 285, Reinhold Publishing Corp.

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