Learn about the five major quartz sand purification technologies in one article

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Quartz sand is also called silica sand. Its main mineral element is silica. It is a mineral material mainly used in glass, ceramics, construction and other industries. The demand is very large, and with the development of high-precision technology, the demand for quartz Purity requirements are also getting higher and higher. At present, there are 4 main Quartz Sand Purification Technology, namely: water washing, graded desliming method, and scrubbing method, magnetic separation method and flotation method.

1. Quartz sand washing and graded desliming method

Quartz sand needs to be purified, often because it has more impurity minerals, and different impurity grades and quartz particle size changes, There is a close relationship. If there are many impurities, the grade of silica will be low. If the silica content is high, the impurities will be low. Therefore, before beneficiation, desliming and impurity removal are generally carried out through water washing and classification.

At present, water washing and graded desliming are common methods in ore purification. The process is relatively simple and the effect is good, but it does not It is not suitable for all ores. For example, it cannot remove thin film iron and sticky impurities existing on the surface of quartz sand.

2. Quartz sand scrubbing method

Quartz sand scrubbing uses a scrubbing machine to cause movement between minerals. During the process, the friction between mineral particles causes the particles attached to the quartz surface to move. Impurity minerals (film iron and sticky impurities, etc.) are removed, and then the mineral particles are classified to achieve the purpose of purification. At present, quartz sand scrubbing methods can be divided into two types: rod friction scrubbing and mechanical scrubbing.

Mechanical scrubbing: Generally, the scrubbing concentration of quartz ore needs to be kept at 50%~60%, which is ideal. Too high or too small concentration will cause problems. Adversely affects the scrubbing effect.

Rod friction scrubbing:When scrubbing, add appropriate mineral processing agents to increase the electrical repulsion between impurity minerals and quartz surface, and enhance the separation efficiency of impurities and quartz.

3. Quartz sand magnetic separation method

Magnetic separation method separates quartz sand. Generally, quartz sand minerals containing hematite, biotite and other weakly magnetic quartz sand are processed through equipment. With excellent magnetic properties, weak magnetic separation can be used to select highly magnetic impurity minerals (such as magnets), and strong magnetic separation can be used to select weak magnetic impurities (such as hematite, biotite, etc.).

Wet strong magnetic separation equipment has a better effect on removing weak magnetic impurities such as limonite, hematite and biotite in quartz ore; while when removing strong magnetic impurities such as magnetite, Weak magnetic equipment or medium magnetic equipment is required.

4. Quartz sand flotation method

The flotation method uses beneficiation agents to change the mineral properties of the mineral surface and separate it. a way. When flotation is used to purify quartz sand, usually after scrubbing, desliming or magnetic separation, if the desired purity cannot be achieved, flotation will be chosen for further purification. It is mostly used to deal with feldspar, mica and various non-magnetic associated mineral impurities in quartz sand. There are two main methods currently available: fluorine flotation and fluorine-free flotation.

Fluorine flotation: Use cationic collector and hydrofluoric acid activator for flotation in the acidic pH range .

Fluorine-free flotation:Due to differences in the structures of feldspar and quartz, by adjusting the ratio and dosage of the anionic and cationic mixed collectors, and taking advantage of the difference in their zeta potential, Feldspar is preferentially flotated to complete flotation purification.

The above are several common methods for beneficiation and purification of quartz sand. In addition, there are also processes such as pickling, microbial leaching, and thermal chlorination. As for which process to choose, it depends on the quartz sand. It depends on the sand impurities and quartz sand grade requirements. Xinhai Mining can customize suitable quartz sand mineral processing and purification process plans, mineral processing plant construction plans and complete sets of quartz sand according to user needsQuartz Sand Mineral processing equipmentetc.