Extraction of lithium from lithium-containing materials

Details Extraction of lithium from lithium-containing materials Extraction of lithium from lithium-containing materials

1985-07-23

1986-05-13

Doll, John

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkali metal

423421, C01D 1502

Patent

active

045885664

ABSTRACT:
This invention relates to the separation of lithium from lithium-containing materials, primarily ores such as hectoritic montmorillonite, having about 0.02 to 2.0 percent lithium by weight. The process comprises reducing the particle size of the material to less than about 500 microns; slurrying the particles with an aqueous base consisting of carbonates or hydroxides of sodium or potassium; heating the resulting slurry at about 50.degree. to 125.degree. C. for from about 0.1 to 6 hr; separating the solids and acidifying the solids with aqueous sulfuric acid to a pH value of about 0 to 2; heating the acidified slurry at about 50.degree. to 125.degree. C. for about 0.5 to 10 hr; separating the residual solids from the aqueous phase; separating the liquid portion of the cooled slurry, which is treated with sodium hydroxide, potassium hydroxide or calcium hydroxide and then with sodium carbonate or potassium carbonate with heating to remove interfering alkaline earth metals, cooling and separating the aqueous phase followed by treatment with sufficient alkali carbonate to precipitate the lithium carbonate with filtering of the hot slurry to remove the lithium as solid lithium carbonate. Lithium and its compounds have a variety of uses ranging from a component of a lightweight electric storage battery to pharmaceuticals used in the treatment of depression and other diseases.

REFERENCES:
patent: 2983576 (1961-05-01), Robinson
patent: 3073673 (1963-01-01), Chubb
patent: 3099527 (1963-07-01), Howling
patent: 3131022 (1964-04-01), Archambault
patent: 3189407 (1965-06-01), Botton et al.
patent: 3523751 (1970-08-01), Burkert et al.
patent: 4124684 (1978-11-01), Olivier et al.

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