Block or coarse grain immersion fluorite mineral, often using hand separation, photoelectric, shaker, stripping and heavy medium dressing methods, for fine grain immersion fluorite ore or the production of high-quality concentrate, flotation method is often used. In order to meet the requirements of ceramic grade or acid grade, direct flotation method or gravity-flotation separation combined beneficiation method is needed. However, different kinds of fluorite mines adopt different mineral processing methods and agents.This article will introduce the fluorite mineral flotation methods and the types of flotation reagents around the four ores of quartz-fluorite type, sulfide-containing mineral fluorite ore, calcite-fluorite type, and barite-fluorite type minerals.
(Fluorite mineral)
If the gangue mineral of fluorite ore is mainly quartz, and its ore composition is relatively simple, in this case, oleic acid is generally used as a collector, soda is used to adjust the pulp pH, and water glass is used to inhibit the emergence of quartz and other gangue minerals. Good fluorite recovery rate can be obtained when the pulp pH value is in the range of 8-9.
Flotation of fluorite ore containing sulfide ore, generally first use xanthate or black medicine collector to select sulfide, and then use fatty acid flotation fluorite. Sometimes, in order to inhibit the residual sulfide minerals in the pulp, a small amount of cyanide will be added to the pulp species to ensure the quality of fluorite concentrate.
(Mineral flotation equipment)
If the main associated minerals of fluorite ore are calcite and quartz, the separation of fluorite ore and calcite is more difficult. In the actual production, water glass, metaphosphoric acid, dextrin and other minerals will be used to inhibit calcium-containing carbonate minerals. These inhibitors can be used alone or in combination. The use method of agents should be based on the specific ore properties and beneficiation test results.
For this type of fluorite mineral, oleic acid is used as collector and sodium carbonate as pH adjustment agent. Both methods of forward flotation fluorite and reverse flotation gangue minerals can be selected. If applying the reverse flotation, the slurry temperature needs to be heated, and the flotation separation effect in the weak acid medium is better. Then after multiple selection can obtain qualified concentrate.
The separation of fluorite ore and barite is also difficult, so the priority flotation process can be used to inhibit the flotation of fluorite from gangue minerals such as barite or first inhibit the fluorite mineral flotation barite. In the production, the concentrator usually adopts the method of mixed flotation. The pharmaceutical system adopted in the mixed flotation is the mixed concentrate of barite and fluorite of sodium carbonate, aqueous glass and oleic acid, and then the fluorite inhibiting barite or barite is used to separate these two minerals. When inhibiting barite, lignin sulfonate, sodium fluoride, sodium silicate and other agents can be used. Citric acid, barium chloride, water glass and other agents can be used to inhibit fluorite.
(Flotation collector)
Fluorite is floating, in the alkaline medium pH in the range of 8-11, oleic acid as a collector, fluorite can be better floating. When using oleic acid as a collector, attention should be paid to the temperature of the mineral slurry, which cannot be lower than 30℃, and the flotation effect is better when the temperature is 50-70℃. In flotation of fluorite, other sulfonic acid or amides such as hydrocarbon yl sulfate, alkyl sulfonated amber gum, sodium oleic amino sulfonate can also be used.
When fluorite flotation, citrate acid can play an inhibitory role, its mechanism of action is the metal cation in complex water, the activation of fluorite is weakened. At the same time, citric acid will react with the calcium cations on the fluorite mineral surface and adsorb on the mineral surface, hindering the reaction between oleic acid and fluorite. In flotation, when the amount of water glass and aluminum salt is small, fluorite can be activated, but if excessive, it will play an opposite role.
(Mineral flotation processing site)
The above contents are the flotation methods and flotation agents of different fluorite minerals. Due to the different composition of fluorite mineral in different mining areas and its different characteristics, it is suggested to carry out beneficiation test before separation. The design of flotation scheme according to the characteristics of ore can improve the utilization rate of fluorite ore and the recovery rate of concentrate, and improve the economic benefit of the dressing plant.
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