The main chemical composition of fluorite is CaF2, the relative density is 3.03.2, the Mohs hardness is 4, brittle, and the melting point is 1270-1350掳C. Fluorite is a relatively common mineral with a wide distribution. According to past statistics, the world has identified fluorite ore resources of about 500 million tons, and the proven reserves of about 250 million tons. China's fluorite reserves rank third in the world, second only to South Africa and Mexico.

As a common mineral in nature, fluorspar is called "the second rare earth" because of its value and wide industrial application rate. There are many single-type fluorite deposits in my country, but the reserves are small, and the associated deposits are few, but the reserves are large. The refining of fluorspar depends on good beneficiation and separation technology, which directly affects the grade and recovery rate of fluorspar. Below we discuss seven factors that affect fluorspar grade and recovery.

fluorite

1. Grinding fineness

In fluorite flotation beneficiation, the grinding fineness is one of the main factors affecting the beneficiation index, which directly affects the beneficiation index of the final fluorite concentrate. Fluorite ore flotation beneficiation, when the flotation particle size is coarse, the flotation selectivity is high, the fluorite concentrate grade is low, and the recovery rate is high; when the flotation particle size is medium, the fluorite concentrate grade is high and the recovery rate is high. Higher; the finer the flotation particle size, the lower the grade of fluorite concentrate and the lower the recovery rate. Therefore, we remind that in order to obtain the ideal fluorite grade and recovery rate, strict beneficiation tests must be carried out, and the grinding fineness should be determined according to the properties of fluorite ore.

2. Pulp temperature

In a certain temperature range, when the temperature is high, the solubility of the carboxylic acid collector in the pulp increases, it is easier to disperse, and the collection capacity for fluorite ore is also stronger, and the recovery rate of fluorite ore is higher, but if The fluorite ore is not completely dissociated, and some gangue minerals will be precipitated together with the fluorite ore, resulting in a lower grade of fluorite ore. When the temperature is low, the collection capacity of the carboxylic acid collector is weak, but some fluorspar ores with better floatability are still selected. At this time, the grade of fluorite ore is high, but the recovery rate is low. It can be seen that appropriately increasing the slurry temperature can also increase the flotation index of fluorite.

3. The type and amount of flotation agents should be reasonable

Fluorite flotation reagents mainly focus on collectors, inhibitors and pH regulators. The collectors commonly used in stone flotation beneficiation are mainly fatty acids, followed by hydrocarbyl sulfates, alkylsulfonates, tar, organic sulfonates, and sulfates. Water glass is the main corrosion inhibitor, followed by sodium metaphosphate, tannic acid, baking glue, starch, dextrin, lignosulfonate, etc. Among them, water glass is a commonly used corrosion inhibitor in fluorite flotation beneficiation. In order to improve the selective antibacterial ability of water glass, water glass and soluble salt can be formulated into composite inhibitors, or acidic water glass can be formulated with sulfuric acid in a certain proportion. The pH regulator mainly uses sodium carbonate to provide a suitable flotation environment for the collector.

4. Slurry level

During the flotation process, the fluorspar minerals with better buoyancy preferentially reach the top layer of the froth layer. When the slurry level is low, the concentrate grade is high, but the recovery rate is low; when the slurry level is high, the recovery rate is high. But its ore grade is low.

5. Pulp pH

The pH value of the pulp has a great influence on the flotation of fluorite. When oleic acid is used as a collector, the buoyancy is better when the pH is 8-11; when the pH is 6, the buoyancy is also good. For different types of fluorite ores, the buoyancy of gangue minerals is also greatly affected by the pH value, which in turn affects the separation effect. For example, when the pH value is 8-9.5, when oleic acid is used as a collector, both stone and calcite have good buoyancy.

6. Water quality

When fluorite is collected with oleic acid, due to the presence of Ca2+ and Mg2+ ions in the water, studies have shown that the presence of Mg2+ will seriously interfere with the flotation of fluorite and significantly reduce the flotation effect. Fluorite water needs to be pre-softened.

7. Process optimization

Fluorite beneficiation and flotation are processes that require delicate operations. Each process requires planned controls and operations to ensure fluorspar grade and recovery. In addition, the setting of mechanical stirring intensity should be reasonable. Within a certain range of mixing intensity, as the mixing intensity increases, the contact time between reagent molecules and mineral particles can be accelerated, and the flotation time can be reduced, thereby improving the recovery rate and grade of concentrate products.

In our opinion, fluorite flotation should do well. It is recommended to do a mineral processing test first, and formulate a scientific and reasonable fluorite ore flotation separation process and technical parameters according to the properties of the fluorite ore and the conditions of the beneficiation plant. It is necessary to improve the skills of operation and maintenance personnel to avoid unstable production conditions due to improper management or negligent operation, which will affect the final fluorite flotation indicators.

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