Lithium Ores

Lithium Ores

 

natural mineral formations with a lithium content sufficiently high to make the extraction of lithium or lithium compounds economically profitable. Lithium usually occurs in ores in the form of characteristic minerals; a small quantity of lithium is a component of rock-forming minerals (micas, tourmalines, and others) as an isomorphic impurity. Lithium is also extracted from the natural brine of certain lakes and mineralized waters. The principal lithium-containing minerals of industrial value are spodumene, LiAl[Si2O6], which contains 6—7 percent Li2O; petalite, LiAl[Si4O10], containing 3.5–4.9 percent Li2O; and amblygonite, LiAl[PO4](F,OH), containing 8–10 percent Li2O; as well as lithia micas, such as zinnwaldite, K(Fe,Mg) LiAl[Si3AlO10](OH,F)2 containing 3.0–3.5 percent Li2O, and lepidolite, KLi1.5 Al1.5[SI3AlO10](F,OH)2, containing 4–6 percent Li2O. In specific cases, lithium-containing minerals form large deposits of lithium—for example, spodumene crystals sometimes reach a length of 2–10 m.

High concentrations of lithium are observed primarily in endogenic deposits and are associated with granitic magmas. Lithium ores are formed during postmagmatic processes at relatively high temperatures (250°-500°C) and at depths of the order of 1.5–7.0 km. The following industrial types of lithium ore deposits are distinguished:

(1) Sodium-lithium rare-metal pegmatite deposits (according to the classification method of A. E. Fersman), which includes the following, subtypes: spodumene pegmatites (the main type of lithium ore deposit), lepidolite-spodumene pegmatites (0.6–1.2 percent Li2O), and lepidolite-petalite pegmatites.

(2) Lithium fluoride rare-metal granite deposits (0.2–0.3 percent Li2O).

(3) Zinnwaldite or lepidolite greisens in association with zinn-waldite-containing cassiterite-tungsten quartz veins (of small industrial value).

Lithium ores are usually dressed by the flotation method or are separated out in heavy suspensions. Spodumene ores can also be dressed by roasting up to 1000°C, at which point the naturally occurring α-spodumene is converted into another polymorphous variety -spodumene). The conversion is related to a marked increase in volume, which causes the ore to crack, readily converting the spodumene into a powder. Sulfuric acid is used to dissociate β-spodumene. All lithium ore deposits are complex in character. In addition to lithium, spodumene and petalite ores also contain beryllium, tantalum, cesium, rubidium, and tin. Feldspar, which invariably occurs in ores, may be used as a raw material in the production of ceramics. Zinnwaldite lithium ores usually contain tin and tungsten. The largest known lithium ore deposits are found in Canada, the USA, Southern Rhodesia, South West Africa, Brazil, and the USSR.

REFERENCES

Ginzburg, A. I. “Spodumen i protsessy ego izmeneniia.” Tr. Mineralogi-cheskogo muzeia AN SSSR, 1959, fasc. 9.
Moskevich, M. M. Mineral’no-syr’evye resursy, proizvodstvo ipotreblenie berilliia, litiia, niobiia i tantala v kapitalisticheskikh stranakh. Moscow, 1966.
Gordienko, V. V. Mineralogiia, geokhimiia igenezis spodumenovykh peg-matitov. Leningrad, 1970.

A. I. GINZBURG

References in periodicals archive ?
Production(a) 1989 1990 Diamonds (000 ct) 927 763 Gold (kg) 336 1,605 Silver 108 92 Uranium 3,600 3,800 Copper (blister) 38,000 33,200 Lead (refined) 44,200 35,100 Zinc (concentrate) 79,800 66,300 Tin (concentrate) 1,700 1,400 Pyrite (concentrate) 196,500 138,900 Tantalite (concentrate, kg) 5,700 3,700 Lithium ores 1,400 1,300 Arsenic trioxide 2,400 1,600 Cadmium 88 69 Fluorspar 25,700 27,100 Marble 12,600 12,800 Salt (coarse) 141,400 155,100 Semi-precious stones 270 786
Small amounts of lithium ore continue to be produced at the Rubicon mine near Karibib, with output of 1,271 t in 1990, of which 1,134 t comprised petalite.
At present, lithium ores of China's ore-based lithium extracting enterprises are mainly imported from Australia.
Under such background, more and more new entrants (dominated by lithium ore enterprises) got involved in lithium carbonate industry.
The rare lithium ores within the territory have laid a solid foundation for Ngawa to build into China's Lithium Valley.
China's lithium ores are mainly distributed in Sichuan, Jiangxi, Hu'nan and He'nan, and brine in Qinghai and Tibet.
However, since the industrial chain of lithium ion battery has extended to lithium ore upstream, the regions with rich lithium ore reserves represented by Yichun Jiangxi, Ngawa Sichuan, Qinghai and Tibet all put forward their own approaches by virtue of their unrivaled conditions for developing lithium ion battery industry.