Common quartz sand 5 beneficiation and purification processes

15311826613

Welcome to consult Xinhai - customized mineral processing plan

Xinhai can provide you with mineral processing tests, mineral processing process and mineral processing equipment selection, mineral processing plant scheme design and construction drawing design; provide mining mineral processing equipment; provide mineral processing plant construction and equipment installation as well as mine management and operation services.

Consultation 153-1182-6613

15311826613

Click to add WeChat

Get product price

WeChat ID has been copied, add friends, and get manufacturer quotations!

Abstract:Quartz sand is the main mineral resource for extracting silica. Silica can be extracted by removing impurities through water washing, graded desliming, scrubbing, magnetic separation and flotation. However, depending on the impurities of quartz sand and the required purity of silica, the higher the purity requirements, the more impurities, and the more complex the selected process flow, and purification cannot be achieved by just one method. Therefore, depending on the purification requirements, different joint beneficiation processes can be used for purification.

The current common quartz sand purification processes include: scrubbing-classification, desliming process, scrubbing-desliming-magnetic separation process, rod friction scrubbing-desliming-magnetic separation-flotation process, rod friction Washing - desliming - magnetic separation - flotation - acid leaching process and dosing, efficient and powerful scrubbing - graded desliming - magnetic separation process.

1. Washing-grading and desliming process

This mineral processing process is mainly suitable for processing quartz sand minerals containing a small amount of clay impurities. Generally, in the natural environment, quartz sand is deposited by weathering During the mineralization process, a large amount of clay minerals and a small amount of iron impurities are attached to the surface of quartz sand, or adhesive minerals (film iron) are produced. The scrubbing-grading and desliming processes can be used to remove the clay on the surface of quartz sand. and muddy iron impurities, etc.

However, this process is generally used as a pretreatment process before raw sand is selected, mainly to remove muddy impurities.

2. Scrubbing-Desliming-Magnetic Separation Process

Usually, during the weathering and mineralization process of quartz sand, in addition to clay impurities attached to the surface, the minerals will also be mixed with brown Iron ore, tourmaline, hematite, biotite and other minerals are associated with these impurities. These associated impurities have weak magnetism, so they need to be removed by magnetic separation. Therefore, the purification process adopts the scrubbing-desliming-magnetic separation process, which can be further Achieve removal of iron impurity minerals.

For this type of impurity minerals containing weak magnetism, after being scrubbed and desludged, they can be passed through a strong magnetic separator or High gradient magnetic separator, the magnetic field intensity is about 13000 Oersted for iron removal, and the effect is ideal.

3. Rod friction scrubbing-desliming-magnetic separation-flotation process

The main purpose of the flotation operation in this process is to remove the feldspar impurity minerals associated with the quartz sand minerals , and the main purpose of the rod friction scrubbing process is to enhance the scrubbing effect, and secondly because the existence of the steel rod can change the particle size composition of the original sand, providing a basis for the purification of quartz sand. After desliming by scrubbing, this type of impurities cannot be effectively removed, so it is necessary to remove feldspar impurities by adding hydrofluoric acid for flotation.

4. Rod friction washing-desliming-magnetic separation-flotation-acid leaching process

Generally, quartz After scrubbing, magnetic separation and flotation operations, the impurities contained in the sand have been basically removed, and the purity of silica can reach 99.5~99.9%, which can meet conventional industrial applications. However, if you want to further improve the purity requirements of quartz sand (ultra-pure quartz sand), you must perform acid leaching treatment on the impurities that appear on the surface of quartz particles in the form of spots and inclusions.

According to the requirements for different impurity minerals (Fe, Al, Ti, Cr) in quartz sand for different industrial uses, mixed acid leaching treatments with different concentrations and ratios are carried out.

After rod friction washing-desliming-magnetic separation-flotation-acid leaching process, quartz sand is purified to obtain silica with a purity of 99.99% and above.

5. Dosing, high-efficiency and powerful scrubbing-graded desliming-magnetic separation process

This process is upgraded and improved in the scrubbing environment. Using dosing scrubbing combined with graded desliming, it can It can efficiently and powerfully remove more than 80% of impurity iron and aluminum minerals, and then remove iron-containing impurities through magnetic separation. After adding high-efficiency and powerful scrubbing - graded desliming - magnetic separation process, SiO₂≥99.8%, Fe₂O₃≤ can be obtained 0.023%, Al₂O₃≤0.05%, TiO₂≤0.02% high-quality refined quartz sand.

The above are the 5 common quartz sand purification processes. We have also introduced the top 5 quartz sand beneficiation methods, but no matter what kind of quartz sand, the mineral processing process needs to be designed through experimental analysis, because the mineral properties, impurity content and purification requirements of each quartz sand mine are different, so the process needs to be customized according to local conditions.