Mica beneficiation method

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Mica, also known as mica schist, is a silicate mineral aggregate with a layered structure, mainly divided into muscovite, biotite, phlogopite and other types. In nature, mica usually exists in the form of flakes, scales or plates. Mica has good insulation, heat resistance, corrosion resistance and high dielectric strength, and is widely used in electrical, electronic, building materials, chemical and other fields. Let's take a look at some mica beneficiation methods?

At present, the common methods for beneficiation of mica are hand selection, friction selection, flotation, shape selection and wind selection.

1. Hand selection of mica

Hand selection is to separate mica and gangue minerals by manual selection based on the differences in appearance characteristics such as color, gloss and shape. It is usually used at the mining site or preliminary selection stage of mica ore. This stage does not require complex equipment and processes, only manual rapid preliminary separation is required to remove most of the gangue minerals. This method completely relies on manual operation, which is labor-intensive. It is difficult to accurately separate gangue minerals with similar appearance characteristics to mica, and the beneficiation accuracy is limited.

2. Mica friction beneficiation method

Friction beneficiation is to use the difference in friction coefficient between mica and gangue minerals for beneficiation. The process is to send the ore into the friction beneficiator, and separate the mica flakes from the gangue minerals through mechanical friction. The ore rubs against the friction plate in the cylinder. The mica flakes are easily thrown to one side of the cylinder due to their small friction coefficient, while the gangue minerals remain on the other side of the cylinder. This method can process larger-scale ores and is suitable for medium and large-scale mica beneficiation plants. It is easy to operate and has low maintenance costs.

3. Mica flotation method

Flotation is a method of mineral processing based on the difference in wettability between mica and gangue minerals. During the flotation process, flotation reagents are added to the pulp to make the mica surface hydrophobic and the gangue mineral surface hydrophilic. Then, by blowing in air, the hydrophobic mica particles are attached to the bubbles and float to the surface of the pulp to form a foam layer, thereby separating from the gangue minerals. This method has a good flotation effect for fine-grained mica ores and mica closely associated with gangue minerals, and is suitable for processing various types of mica ores, including complex multi-metallic mica ores. However, this method is strict with the use of reagents and requires a large amount of reagents. It requires matching flotation equipment and reagent addition systems, and the equipment investment and operating costs are high.

4. Mica shape sorting method

Shape sorting is based on the unique flake shape of mica. It is to separate the flake mica from other shapes of gangue minerals under the action of gravity and water flow. It is often used

5. Mica air separation method

Air separation is to use the difference in specific gravity and suspension speed between mica and gangue minerals for mineral separation. The process is to crush the ore and send it into the air separation equipment. Through the action of wind, the mica flakes with smaller specific gravity and larger suspension speed are separated from the gangue minerals with larger specific gravity and smaller suspension speed. No water and chemical agents are required in the air separation process. It is environmentally friendly and has low energy consumption. It can process larger scale ores and is suitable for medium and large-scale mica beneficiation plants. It is difficult to accurately separate gangue minerals with similar specific gravity and suspension speed to mica, and the beneficiation accuracy is relatively low. At present, the commonly used air separation equipment includes cyclone separators, airflow classifiers, etc.

The above is an introduction to the beneficiation method of mica. In the actual beneficiation plant, the beneficiation method of mica needs to be determined according to the properties of its ore. It is recommended to conduct a ore dressing test first, and design a suitable process flow through test analysis. At the same time, a complete set of mica beneficiation equipment is provided to improve the beneficiation efficiency.