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The crushing and screening stage of fluorite ore mainly involves the preliminary crushing of fluorite ore. According to the physical properties of fluorite ore and the required particle size, different crushing processes can be adopted, such as three-stage one closed circuit crushing, three-stage open circuit crushing or two-stage one closed circuit crushing. In this stage, crushers, screeners, electronic iron removers and metal detectors are the main equipment used.
Crusher: Jaw crusher has the advantages of simple structure, large output, stable operation, and adjustable size of the discharge port to meet different production requirements; it is suitable for coarse crushing; cone crusher is suitable for medium and fine crushing with its high efficiency and large output.
Screening machine: Drum screen is suitable for the situation where the original ore contains a large amount of mud and the degree of adhesion is serious, reducing the blockage of the screen hole, and can be screened with water to play the role of washing the ore; circular vibrating screen is suitable for rock ores without mud and low water content, and can perform efficient screening operations.
Electronic iron remover and metal detector: used to remove iron impurities, usually set after one stage of crushing.
Entering the grinding and classification stage, the ore particles will be further ground to the monomer dissociation state. As the core equipment in this stage, the ball mill significantly improves the fineness and purity of fluorite through efficient grinding.
Ball mill: Different types of ball mills are selected according to different grinding processes. The first stage grinding and classification process mostly uses a grid ball mill; the second stage grinding often uses an overflow ball mill.
Classification equipment: including hydrocyclones and spiral classifiers. Hydrocyclones are often used in combination with overflow ball mills, and spiral classifiers are often used in combination with grid ball mills.
In the sorting stage, when the original ore is a coarse-grained fluorite lump ore, a gravity separation process can be used. When the original ore has a high mud content, is accompanied by impurity minerals, or the useful minerals are embedded in a fine particle size, a flotation process can be used.
The gravity separation of fluorite ore is carried out by gravity separation based on the specific gravity difference between fluorite and associated gangue, which also has a good enrichment effect on the beneficiation of some low-grade fluorite ores. Its main equipment is a jig. The jig is usually composed of a jig chamber, a diaphragm and a transmission system. The processing particle size range is 30 (20) ~ 0.5mm; the shaking table is suitable for processing fine-grained fluorite ore, and the processing particle size range is 2 ~ 0.037mm; the spiral chute is suitable for processing complex and low-mud fine-grained fluorite ore, and the processing particle size range is 0.1 ~ 0.37mm.
By adding suitable flotation agents, the surface properties of fluorite ore and gangue minerals are changed to achieve mineral separation. The main equipment used in this stage are mechanical stirring flotation machines and aerated flotation machines.
In order to ensure the ideal beneficiation effect, it is recommended to conduct a beneficiation test on the ore before beneficiation to scientifically and reasonably determine the beneficiation process.
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