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Click to add WeChatMica minerals are silicate minerals. There are many types of minerals, such as black mica, muscovite, lepidolite, sericite, etc. They have many excellent properties and are widely used in modern industry. However, all types of mica deposits have associated minerals, which have higher requirements for their beneficiation technology. Currently, the common mica beneficiation technologies include hand separation, flotation, shape purification, friction purification and winnowing. The following are Let’s introduce these mica mineral processing processes together!
Hand selection In small mica concentrators, the main method used to sort larger flake mica is to use Manually select and remove the mica that has been dissociated from the monomer at the mining working face or pit mouth or ore pile; or use a hand hammer to break the continuous mica ore and select the mica among them.
The hand-selected mica method has a simple process and requires less equipment, but overall the labor force is larger.
When the mica ore is crushed and ground to dissociate its monomers, under the action of chemicals, Flotation machine separates foam products from gangue minerals. Flotation separation of mica is mostly suitable for flake mica and crushed mica. There are two methods: acidic cation flotation and alkaline anion-cation flotation.
Acidic cation flotation: It can effectively recover coarse-grained mica below 14 mesh. Before sorting, it needs to be Desliming is carried out on a vibrating screen (screen mesh 150~200 mesh), and then sulfuric acid is used as a pH adjuster to suppress quartz, and amine acetate is used as a cationic collector to collect mica. The flotation effect is better at pH 0~4.
Alkaline anion-cation flotation: It can effectively recover mica minerals above 20 mesh. A small amount of slime can be allowed to exist during the flotation process, but it needs to be removed in advance. Sticky minerals. This flotation method can use sodium carbonate and calcium lignosulfonate as inhibitors, calcium carbonate as a pH adjuster, and calcium lignosulfonate can also be used as a dispersant. The recovery effect of mica is better between pH 8, 0~10, and 5. good.
For mica ore flotation, due to the characteristics of mica ore, the flotation process often adopts three stages of rough separation and three or more stages of selection to obtain better mica concentrate.
Shape purification of mica is selected based on the different shapes of mica crystals and gangue. The holes have different abilities to effectively separate mica and gangue. When sorting, a screen with two or more layers and different surface structures is used. When the raw ore enters the screen surface, due to vibration, the flake mica stays on the screen surface, and small pieces of flake mica and gangue minerals enter the second layer. sieve surface, and then the gangue falls under the sieve to achieve the separation of mica and gangue. This method has a simple process, requires less equipment, and has high production efficiency. It is a commonly used separation method in mica mineral processing.
The friction purification process is mainly based on the sliding friction coefficient and round veins of flaky mica crystals. Due to the difference in the rolling friction coefficient of the stone ore, mica crystals are separated from the gangue, and equipment such as inclined plate sorters, spiral sorters and metal inclined plate sorters are often used for sorting. At present, the friction purification process and equipment of mica ore are not perfect and have not been widely used in mica mineral processing.
Wind separation to separate mica is mostly suitable for some types of crushed mica ores. The main process flow is: crushing - classification - air separation. When the ore is crushed, mica forms flakes, while quartz and feldspar gangue minerals form massive particles. At this time, multi-level classification operations can be used to pre-divide the selected materials into narrower particle sizes, and then use air separation to separate them based on the suspension speed difference in the air flow. Winnowing to separate mica is mainly suitable for areas lacking water resources.
The above is an introduction to several common mica beneficiation technologies. However, the ore properties of different mica are different, and the differences are large. When choosing a process, You cannot blindly follow the trend, or choose a solution with similar properties to your own ore, as this will reduce the mica recovery rate. You should conduct a mica beneficiation test based on your own actual situation. , Through experimental analysis, designing a suitable mica beneficiation process plan and configuring a complete set of mica beneficiation equipment can achieve the ideal return on investment.
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