1. Grinding particle size (ie grinding fineness)

In the ore dressing operation, grinding fineness is one of the most important factors affecting the mineral processing index, which directly affects the mineral processing index of the final concentrate. Through the ore dressing conditions test, it is found that the flotation index of the fluorite ore concentrate in Xinjiang shows a regular change with the thickness of the flotation granularity within a certain range of particle size. When the particle size is coarse, the recovery rate of fluorite is higher, but the grade is lower; when the particle size is finer, the recovery rate of fluorite is lower, but the grade is higher. Therefore, in order to improve the fluorite recovery rate, the grinding size should be reduced, and vice versa.

2, pulp temperature

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, when the temperature is high, the solubility of carboxylic acid in the pulp increases, and it is easy to disperse. The recovery ability of fluorite ore is strong, and the recovery rate is high, but if the fluorite dissociation is incomplete, it will Some gangue minerals are selected along with fluorite, which will result in lower grades of fluorite ore. When the temperature is lower, the carboxylic acid recovery ability is weak, but some fluorites with better buoyancy will be selected. Come out, the grade is high at this time, but its recovery rate is low.

3, collector

Under certain conditions, when the amount of collector is large, the recovery rate is high, but the grade is low. In general, rough selection is to increase the amount of collector, and try to increase the recovery rate; when the amount of collector is small, the recovery rate is low, but its grade is high. In the selection of operations, it is generally preferred to add less or no collector to improve the concentrate grade.

4, inhibitor

The main role of the inhibitor is to inhibit gangue minerals and harmful elements in the ore. In the condition test of fluorite ore inhibitors in Xinjiang, when the amount of inhibitor is low, the content of gangue mineral calcite and barite in the concentrate product is high, resulting in lower grade of concentrate product, but due to a section of grinding operation, fluorite and The disintegration of gangue minerals is incomplete, and some of the fluorites that are attached to the gangue minerals are selected together, resulting in higher recovery. When the amount of the inhibitor is large, the grade is high, but the recovery rate is low. In the selection of operations, the addition of inhibitors is generally used to improve the grade of concentrate products.

5, slurry level

During the flotation process, the fluorite mineral with better buoyancy preferentially reaches the top layer of the foam 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 higher. , but its mineral grade is lower.

6, 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 floatability is better when the pH is 8-11; when the pH is 6, the floatability is also better. For different types of fluorite ore, the floatability of gangue minerals is also greatly 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.

7, the quality of water

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

8, part of the mine concentrated re-election back

According to the experimental research, when the middle ore sequence returns, part of the gangue minerals have been circulating in the flotation system, which can not be tailed, affecting the flotation index; if some of the gangue minerals with high content of gangue are selected, they will be re-elected and then refined. The mine returns to rough selection, and the tailings directly throws tail. This return method not only reduces the load of the circulation system, but also improves the grade and recovery rate of the concentrate product.

9, mechanical stirring strength

Within a certain range of stirring intensity, as the stirring intensity increases, the contact time between the agent molecules and the mineral particles can be accelerated, and the flotation time can be reduced, thereby improving the recovery rate and grade of the concentrate product.

10, operating conditions

In the actual production process of the site, due to improper management or the negligence of the operators, the production conditions are unstable, which will also affect the beneficiation index of the final fluorite concentrate.

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