Factors affecting fluorite flotation

1. The pH of the pulp

The pH value of the slurry has a great influence on the flotation of fluorite . When using oleic acid as the collector , the pH is 8-11, the floatability is good, and the recovery rate can reach 80-90%. When the pH is 6, the floatability is also good.

For different types of fluorite ore, the floatability of gangue minerals is also affected by the pH value, which affects the sorting effect. For example, when using oleic acid as a collector, the pH is 8~9.5. Both the stone and the calcite have good floatability.

2, the temperature of the pulp

Fluorite is usually floated with a carboxylic acid collector. Due to the high freezing point of the carboxylic acid, the slurry temperature has a significant effect on the flotation process. In a certain temperature range, the temperature increases, the solubility of the carboxylic acid in the pulp increases, and it is easy to disperse, thereby facilitating the full utilization of the collecting performance. The use of oleic acid in production is generally heated to 30 °C.

3, flotation granularity

Coarse-grade fluorite, high flotation selectivity, high grade and low recovery rate;

Medium-grade fluorite, high grade and recovery rate in flotation;

Fine-grained fluorite, flotation concentrate grade and recovery rate are low.

4, the quality of water

When fluorite is collected by oleic acid, there are Ca ₂ ⁺ and Mg ₂ ⁺ ions in the water. Studies have shown that the presence of Mg ₂ ⁺ will seriously interfere with the flotation of fluorite, significantly reducing the flotation effect, so flotation Stone water needs to be softened beforehand.

Add sodium carbonate to soften the water.

5, flotation reagent

1 collector

The collector may be used as a collector of fluorite, such as hydrocarbyl sulfate, alkylsulfonated succinamine, sodium oleate sulfonate, and other sulfonates and amines;

2 inhibitor

Water glass is the most commonly used inhibitor for fluorite flotation. In order to improve the selective inhibition ability of water glass, water glass and soluble salts are combined into a combination inhibitor, or sulfuric acid is formulated into an acidic water glass in a certain ratio.

Soviet Union patent describes a fluorite calcite separated organic inhibitor, than sodium silicate, aluminum sulfate and sodium hexametaphosphate phosphate good effect.

H1010 is a mixing regulator composed of an acid, a base and a synergist. It can effectively separate fluorite from calcite and quartz .

NL, NS and NO3 inhibitors composed of water glass, aluminum sulfate, sodium sulfate and carboxymethyl cellulose are used for fluorite flotation in Shizhuyuan, and the effect is good.

6, other technical measures

(1) Branch flotation should be used in the fluorite flotation process

In order to adapt to the high-quality concentrate production and strengthen the effect of low-grade raw ore sorting, the branch flotation process has been adopted abroad, and the research on fluorite ore has proved that the index of the branch flotation process (concentrate contains CaF ₂ 95.8%, the recovery rate is 97.6 %) superior to direct flotation (concentrate containing 89% CaF ₂ , recovery rate 97.8%).

(2) Fatty acid collectors are still the main agents for flotation fluorite. Therefore, how to improve its selectivity and ability to capture is still a way to strengthen fluorite flotation. The following measures are often used:

1) Strengthen mechanical stirring;

2) increase the temperature of the slurry;

3) oleic acid oil and coal mix (1/1);

4) saponifying oleic acid with an excess of soda (1:0.28), or emulsifiing oleic acid with a small amount of sodium carbonate (1:0.05);

5) Alkyl sulfate is used as a dispersing agent for the fat soap liquid.

Fluorite (CaF ₂ ) contains F 48.9%, Ca 51.1% fluorite has good floatability, and fatty acids are often used as collectors. The pH of the pulp has a great influence on the flotation effect of fluorite. Using oleic acid as a collector, when the pH of the slurry is 8 to 11, the fluorite has better buoyancy. Secondly, raising the temperature of the slurry can also increase the flotation index of fluorite. At the same time, the flotation behavior of fluorite with different particle sizes is also different. The coarse-grained fluorite flotation is characterized by strong selectivity; therefore, its concentrate grade is high, but the recovery rate is low; the medium-grained fluorite flotation results in higher concentrate grade and recovery rate; fine-grained fluorite float The selected concentrate grade and recovery rate are both low. When flotation fluorite uses oleic acid as a collector, there is also a higher requirement for floating water. That is, when the water quality is hard water, the water entering the flotation process is first softened in advance.

Fluorite flotation collectors In addition to oleic acid, hydrocarbyl sulfates, alkylsulfonated succinamines, sodium oleoylsulfonate and other sulfonates and amines can be used as collectors for fluorite flotation. Commonly used sodium carbonate as a pulp conditioner. Depending on the nature of the gangue, water glass, sodium metaphosphate, lignosulfonate, dextrin, etc. can be used as the gangue inhibitor.