High-purity quartz sand production

The chemical composition of quartz sand is silicon dioxide (SiO2), while high-purity quartz sand means that the content of SiO2 is higher than 99.9%. As one of the important industrial raw materials, quartz can be widely used in glass, building materials, plastics, electronic materials and other industries, but the purity requirements of quartz sand are very high for fields such as electronic technology, aerospace, optical fiber communication and military industry. The following editor will sort out the high-purity and production line process for you, let's get started!

In industrial production, ordinary quartz sand is usually pretreated first, and then purified into high-purity quartz sand. The purification methods mainly include physical purification, chemical purification and biological purification.

1. Physical purification

Common physical purification methods of high-purity quartz sand can include washing-grading desliming, scrubbing, gravity separation, magnetic separation and flotation. Implement purification requirements.

Water washing-grading desliming/scrubbing: In the process of beneficiation of quartz sand, the particle size of less than 0.1mm is usually called sludge. There are relatively more ores, so impurity minerals can be removed by washing-grading desliming or scrubbing to improve the grade of quartz concentrate.

Gravity separation: It mainly utilizes the differences in the relative density, particle size, shape, etc. of the particles between the minerals, so that under the action of water and centrifugal force, different movement speeds and different directions are generated to achieve the separation of minerals.

Magnetic separation: The magnetic separation difference between quartz and impurity minerals is mainly used to remove magnetic minerals such as hematite, limonite and biotite in minerals to the greatest extent through magnetic separation equipment.

Flotation: Use chemicals and flotation equipment to change the difference in surface properties between minerals, select high-purity quartz sand in other places under acidic conditions, and remove pure fine-grained hematite, biotite, garnet and aluminum minerals in minerals. .

2. Chemical purification

The chemical purification methods of high-purity quartz sand mainly include acid leaching and alkali leaching. The purification effect of high-purity quartz sand is better.

Acid leaching: The commonly used acids are mainly sulfuric acid, hydrochloric acid, nitric acid, hydrofluoric acid, etc. When the acid is relatively dilute, the removal effect of impurities such as iron, aluminum, and magnesium is better, and when the acid is relatively concentrated, it is effective for impurities such as titanium and chromium. Good removal.

Alkaline leaching: Alkaline solutions such as sodium hydroxide or sodium carbonate are commonly used to dissolve aluminum-containing silicate impurity minerals to achieve the purpose of purifying quartz sand.

3. Biological purification

The high-purity quartz sand biological purification method mainly adopts microbial leaching and purification, using the physiological functions of microorganisms and their metabolites, through oxidation, dissolution and decomposition, to separate the impurities on the surface of the quartz sand from the quartz matrix, and realize the purification of the quartz sand. .