How to remove gangue minerals in quartz sand?

Quartz sand is a commonly used mineral material that is widely used in various industries. However, the presence of gangue minerals in quartz sand can affect its quality and performance. Therefore, it is necessary to remove gangue minerals in quartz sand. Here are some methods for removing gangue minerals in quartz sand:

1. Gravity separation: This method is suitable for separating gangue minerals with a large difference in density from quartz sand. Commonly used equipment includes spiral chutes, shaking tables, and jigs.

2. Magnetic separation: This method is suitable for removing magnetic gangue minerals from quartz sand. The commonly used magnetic separators include dry magnetic separators and wet magnetic separators.

3. Flotation: This method is suitable for removing gangue minerals with small specific gravity differences from quartz sand. It is commonly used to remove feldspar, mica, and other minerals. The commonly used flotation machines include mechanical agitation flotation machines, inflatable flotation machines, and column flotation machines.

4. Acid leaching: This method is suitable for removing iron-containing gangue minerals from quartz sand. Acid leaching can dissolve iron minerals in quartz sand, and then wash them away with water. The commonly used acids are sulfuric acid, hydrochloric acid, and nitric acid.

5. Alkali leaching: This method is suitable for removing aluminum-containing gangue minerals from quartz sand. Alkali leaching can dissolve aluminum minerals in quartz sand, and then wash them away with water. The commonly used alkalis are sodium hydroxide and potassium hydroxide.

In conclusion, the above-mentioned methods are commonly used for removing gangue minerals in quartz sand. The specific method should be selected based on the composition of the gangue minerals and the requirements for quartz sand quality.