1 spodumene A12O3·Li2O·4Si02, containing Li2O 4.5% to 8%. The surface-purified spodumene is easily floated with oleic acid and its soaps, but its surface is polluted or polluted by the slime in the pulp, and its floatability deteriorates. In addition, some dissolved salt ions ( copper , iron and aluminum ions, etc.) in the pulp not only activate the spodumene, but also activate the gangue minerals, so the mud is removed before the flotation and treated with alkali. When treated with sodium hydroxide, the recovery rate of spodumene increases with the amount of the spodumene, and the stirring time is also shortened accordingly. As the stirring strength increases, the recovery rate also increases. If the speed is increased by 7 times, the recovery rate can be increased by 40%.
When using oleic acid or naphthenic acid soap as a collector , spodumene can float well in both neutral and alkaline media. When octadecylamine and sodium phosphonate are used as collectors, spodumene can only float in weakly alkaline or neutral media. When oleic acid is used as a collector, sodium fluoride and lignosulfonate are used as regulators, and the pH of the spodumene is best when the pH is adjusted to 7 to 7.5 with sodium hydroxide and sodium carbonate.
The activated spodumene can be floated with an anionic or cationic collector. Unactivated spodumene is difficult to float when the amount of oleic acid is high.
Regardless of the type of collector used, water glass, dextrin and starch are strong inhibitors of spodumene. Among them, the selectivity of starch is better, followed by dextrin. They first suppress spodumene and then suppress gangue. However, the selectivity of water glass is poor, and the spodumene and gangue are simultaneously inhibited.
The flotation particle size of spodumene is generally below 0.15 mm. When the particle size was 0.2 mm, the recovery rate of flotation was 61%, and when the particle size was 0.3 mm, the flotation recovery was 22%. It is one of the characteristics of spodumene flotation.
2 lithium mica Al203·3Si02.2 (KLi)F, containing Li20 1.2% to 5.9%. The coarse-grained lithium mica is enriched by hand selection, air separation or friction, and the fine-grained lithium mica is recovered by flotation. The lithium mica collector is preferably a cationic collector, and when octadecylamine is used, the lithium mica is well floated in both acidic and neutral media. Unactivated lithium mica cannot be recovered by oleic acid, and after activation with hydrofluoric acid, better indicators can be obtained.
Some iron salts, lead salts, sodium sulfide, sodium hydrogen phosphate starch and pulp, and the like can be suppressed lepidolite. Lithium carbonates and sulfates activate lithium mica. When octadecylamine is used to select lithium mica, the best activators are water glass and lithium sulphate, while strong inhibitors are mixtures of bleaching powder, sodium sulphide and starch. The nitrates of copper, aluminum and lead are inhibitors of lithium mica, while the sulfates of copper and aluminum are activators of lithium mica.
3 lithium feldspar Al203·Li20·8SiO2, containing Li20 2%～4%, using anionic collector such as oleic acid, sodium oleate, sodium isooctyl citrate to float lithium feldspar at any pH None of them float. With a cationic collector, such as octadecylamine for flotation of lithium feldspar, its floatation is good. When octadecylamine is used as a collector, the recovery rate is 78% when the pH of the slurry is 5.5-6.0, and the alkylamine salt is used in an alkaline medium (pH 7.5-9.5). When flotation, the recovery rate can be increased to 90% to 92%.
When an alkylamine salt is used as a collector, ferric chloride (300-500 g/t) can strongly inhibit lithium feldspar. When the pH of the medium is 5.8, the recovery rate is reduced to 10% to 15%. In acidic and alkaline media, its inhibition is enhanced. Calcium chloride activates lithium feldspar and improves its recovery in neutral and alkaline media (pH = 9.2). In the case of using an alkylamine salt, the inhibitor of lithium feldspar is sodium sulfide, sodium silicate, starch, tannin, sodium carbonate, sodium fluorosilicate, and sodium hydrogen phosphate.
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