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In the process of mineral processing of mica ore, no matter which method is used, it follows the pre-selection process, the separation process and the post-selection product processing process.
Pre-selection process: Including crushing, screening, grinding, grading and other processes, used for preparation before selection;
Separation process:There are several types of separation: hand selection, flotation, gravity separation, friction separation, shape separation and winnowing. They can effectively separate mica from other minerals and obtain the final mica concentrate, but the process How to choose depends on the properties of mica ore;
Post-selection product treatment process:It mainly includes two parts: concentrate dehydration process and tailings dehydration process.
For each of the above mineral processing links, let’s learn about the common mica mineral processing equipment!
Generally, in the mica ore crushing and screening process, one-stage closed-circuit crushing or two-stage closed-circuit crushing process is often used. When the mineral properties are complex, sometimes A three-stage crushing process is adopted. Process: The raw ore is fed into the crusher for crushing, and the crushed products are sent to the screening machine for screening. The materials above the screen are returned to the crusher for further crushing, while the materials below the screen enter the next step.
The equipment required for mineral processing at this stage includes: crusher, screening machine, belt conveyor, etc.
Crusher: Depending on the process flow, jaw crusher can be used for coarse and medium crushing operations, roller crusher and Impact crusher performs fine crushing operations.
Screening machine: There are three types of self-centering vibrating screen, linear vibrating screen and circular vibrating screen, which are used for medium and fine particle classification, coarse particle classification and fine particle classification respectively.
The grinding and classification operation is the main process of further grinding the mica after crushing. Only after the grinding reaches the particle size requirements can it be classified. Don't do homework. According to the different properties of mica ore, this link includes grinding + screening process, grinding + classification process. Rod mill equipment is generally used for grinding, which can effectively separate mica from other impurity minerals, and mica is less damaged. .
Sometimes, in order to reduce the phenomenon of over-crushing of mica, a multi-stage crushing process will be used to complete its monomer dissociation. When dealing with ores with high ore content near the surface, medium crushing 3 to 4 can be used to completely dissociate; For hard ore with low mineral content, medium crushing can be used for 5 to 6 times to disintegrate.
The equipment required for mineral processing at this stage includes: rod mill, classifier, screening machine, etc.
Rod mill: Mainly uses wet rod mill Machine equipment can be used not only as grinding equipment, but also as fine crushing equipment to complete mica grinding operations;
Classifier: High weir spiral classifier and low delay spiral There are two types of classifiers, and the specific situation depends on the classification particle size requirements;
Screening machine: Generally, a self-centering vibrating screen or a circular vibrating screen is used to classify mineral particles.
There are many types of mica separation equipment, mainly based on their beneficiation methods. Among them, for sheet mica with a crystal outline area greater than 4cm2, it can be selected according to the differences in the shapes of mica crystals and gangue ores, friction systems, etc. Three methods can be used: hand selection, friction selection and shape selection; and For crushed mica with a crystal outline area less than 4cm2, it is selected based on the physical and chemical properties and specific gravity of the gangue mineral surface. Generally, flotation, gravity separation and winnowing methods are used.
The equipment required for mineral processing at this stage includes: inclined plate separator, vibrating screen, flotation machine, stirring tank, shaker and spiral classifier.
Hand selection method: Manual selection is usually used. Workers pick out mica that has been separated into monomers on the mining working face or the ore pile at the pit mouth. When conjoined minerals appear,you can use a hand hammer to crush it to separate its monomers, and then select the mica concentrate.
Friction sorting method: It is sorted based on the difference in the sliding friction coefficient of flaky mica crystals and the rolling friction coefficient of round gangue minerals. Generally, an inclined plate is used Sorting machine.
Shape sorting method: It is sorted based on the different shapes of mica crystals and gangue ores. One or two layers of vibrating screens can be used to complete the sorting.
Flotation method:According to the difference in surface physical and chemical properties between mica and other impurity minerals, XCF, KYF, SF, JJF type flotation machines and high-efficiency stirring tanks are used , chemical mixing tank to complete flotation separation and obtain qualified mica concentrate.
Gravity selection method:Mainly use the density difference between mica and gangue for selection, and a shaking table can be used Or spiral chute to complete the sorting.
Wind separation method: After crushing and screening the flake mica and massive gangue, special sorting equipment is used to sort them.
Dehydration treatment is mainly for dehydration of concentrate and tailings. Concentration equipment and filtration equipment are mainly used for concentrate dehydration to make wet mica essence After the ore reaches a certain moisture content, it is dried for industrial applications; dehydration of mica tailings is mainly determined according to the tailings treatment requirements, and different tailings dry discharge processes can be used to achieve dehydration. The required equipment includes: high-efficiency concentrator, chamber filter press, vacuum filter, cyclone and dehydration screen. How to use them together depends on the dehydration requirements.
The above are the options An introduction to common mica ore beneficiation equipment in factories. In actual beneficiation plants, the specific type of equipment used should be determined according to the mica ore beneficiation process.
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