Abstract: The research status of fluorite ore flotation reagents is reviewed. The types of collectors and regulators, mixed drugs, mechanism of action and research progress are reviewed in detail, with a view to benefiting domestic and foreign counterparts.
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Key words: fluorite; flotation reagent; synergistic effect; mechanism of action
Fluorite, also known as fluorspar, pentas, and chemical composition CaF2, are the main sources of fluorine in the industry. Flotation is one of the important means of recycling fluorite. Research on fluorite ore flotation agents has focused on collectors and inhibitors. Commonly used collectors are mainly fatty acids, followed by hydrocarbyl sulfates, alkyl sulfonates, tal oils, organic sulfonates and sulfates. The main inhibitors are water glass, then there is partial sodium phosphate, tannic acid, baking gum, starch, dextrins, lignin sulfonate. In recent years, a large number of new collectors and inhibitors for flotation fluorite have been developed and put into use. The development of selective collectors and high-efficiency modifiers is the main research direction of fluorite flotation reagents.
The combination of two or more agents is often superior to any of these agents, which is the synergistic effect of the agent. The general use of collectors or conditioners is better than using them alone.
1 collector and its mixed drugs
1. 1 collector
1. 1. 1 oleic acid
The animal and vegetable oils are hydrolyzed to obtain mixed fatty acids, and the mixed fatty acids are frozen to about 10 ° C, and the solid portion and the liquid portion are separated by pressure filtration, and the liquid portion is industrial oleic acid.
Tu Wenyu, et al. used oleic acid as a collector, sodium carbonate, sodium silicate, and sulfuric acid as adjusting agents to select a granitic refractory ore. After a ball milling, a coarse and eight closed-circuit flotation test, CaF2 was obtained. Concentrate with a grade of 98. 65% and a recovery rate of 47.26%.
Oleic acid has both physical and chemical adsorption on the surface of fluorite, physical adsorption at lower pH, and chemical adsorption at higher pH. The adsorption of oleic acid on the surface of barite and calcite is mainly chemical adsorption.
1. 1. 2 Oxidized paraffin soap
Compared with oleic acid, the source of oxidized paraffin soap is guaranteed, the price is low, the collecting power is strong, and the use is convenient. It is soluble in water when heated to 60~70 °C. The flotation effect is better at normal temperature, and the flotation speed is fast. It is an excellent collector for fluorite flotation. Lug Zeng, et al. For the low-grade fluorite ore with a simple mineral composition, the grinding fineness is less than 0. 074 mm, 65%, the oxidized paraffin soap is 0.6 g/t, and the adjusting agent sodium carbonate is 1. 5 g / t, fluorite concentrate with a CaF2 grade of 92.90% and a recovery rate of 95.67%, obtained by flotation at a water glass dosage of 2.0 g / t.
1. 1. 3 TF28
TF28 was developed by the Department NTUT dressing made of a tetraacid, is anionic collector. 75%和76。 The alkyl s-hydroxy-1, 1- bisphosphonic acid (TF28) as a collector, the modified starch as an inhibitor, the removal rate of the sulfur and phosphorus in the fluorite ore reached 95. 75% and 76 34%, CaF2 grade increased from 49. 51% of the ore to 96.13% of the concentrate. ESCA (Electr o nSpectro sco py for Chemical Analysis) and adsorption strength test results show that when the slurry pH = 5, TF28 is chemically adsorbed by the conjugated group and the three mineral surface cationic active sites, while at the same time There is physical adsorption on the surface of spar and apatite.
1. 1. 4 naphthenic acid
Wang Shaoyan et al. at pH = 5. 7 , naphthenic acid concentration 5-10â€5mol / L, starch concentration 3 mg / L, calcium nitrate concentration 1x10 - 4mol / L, containing CaF2 91.3%, BaSO44. 96% of a fluorite ore mixed ore sample was subjected to flotation, and a fluorite concentrate having a CaF2 grade of 98.67% and a recovery rate of 97.55% was obtained. In a weakly acidic medium, naphthenic acid is physically adsorbed on the surface of the fluorite by molecular form, and calcium naphthenate is formed on the surface of the fluorite to form a strong chemical adsorption. The inhibition of barite by aluminum sulfate is mainly due to the fact that Al3+ can be strongly adsorbed on the surface of barite by hydrogen bonding and electrostatic interaction in the form of polyhydroxy complex.
1. 1. 5 N-amidocarboxylic acid
H. Balduf, a refractory fluorite ore with a CaF2 grade of 19% to 50% and a CaCO3 grade of 5% to 30% in sodium silicate dosage of 900g / t and sodium hexametaphosphate 20g / t, N
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