Home Product Knowledge Guide to Silica Sand Flotation Process

Guide to Silica Sand Flotation Process

2022-01-05 Xinhai (205)

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The primary mineral of natural silica fine sand and quartz sandstone is quartz, and some other impurity minerals in many cases are associated with it, such as mica nutrients, feldspar minerals and iron and corundum minerals. However, the mixing of these impurities greatly reduces the cost of quartz fine sand and impacts the quality of products. Therefore, it is necessary to carry out the impurity elimination for the silica sand. Here is the silica fine sand purifying process and equipment for the silica sand processing plant.


1. Process and equipment used for the impurity resolution of silica sand

The particular impurity resolution process of silica fine sand means to follow the crushing, milling and classifying in order to the natural quartz sandstone ore and make the impurities and minerals reach their state of monomer dissociation, and then use the classifying procedure to obtain the raw silica sand meeting the needs of feed size, in order to get ready for the subsequent impurity resolution of silica sand.

Implementing the jaw crusher to crack the natural quartz sandstone ore into small pieces, and then using the grinding mill to grind the little pieces of quartz ore into finer silica fine sand through the damp grinding way. The particular wet grinding process can not only eliminate the dirt produced in the grinding process, but also associated with particles of silica sand rub against each other, and prompt the harmful particles attached to the surface of silica fine sand (such as metal oxide and hydroxide) to dissociate from the silica fine sand particles. Subsequently, the grinding products get into the category operation, the silica sand meeting the particle size requirements can be used as raw silica sand to bring out the impurity removal of silica sand, the rough grains come back to grinding generator for re-grinding.

2. Process and equipment used for the impurity removal of silica fine sand

The impurity elimination process of silica sand is to remove the nutrient impurities from the raw silica fine sand by scrubbing and dumping, magnetic splitting up, chute gravity splitting up, flotation, pickling or several combined methods, to be able to get the high-purity silica sand with required particle size and impurity content.

1. Scrubbing and desliming method

Implementing the mechanical power of the washing machine and the grinding power among the fine sand particles to remove the thin movie iron outside the silica sand, the binding and dull impurity calcium build up.

2. Magnetic splitting up method

The Magnetic splitting up method is one of the effective strategies to remove metal impurities from uncooked materials. The hematite, limonite, biotite and other minerals included in the uncooked materials are weakly magnetic, which is often chosen by the moist type strong magnetic separator with the magnetic field strength of 8×105A/m. and using the weak magnetic separator or the medium magnetic separator can be taken when the raw material includes the strong permanent magnet mineral (such as magnetite). To be able to further remove other small amounts of weakly magnetic minerals (such as amphibole, pyroxene and the constant growth of permanent magnet minerals and quartz), a high lean magnetic separator with a magnetic field strength greater than 12, 000 Gauss can be taken for secondary magnetic splitting up.

3. Chute the law of gravity separation method

Whenever the raw materials contain a very small quantity of heavy mineral pollutants (such as zircon), the spiral chute gravity splitting up method can be used to effectively remove such heavy mineral impurities because they don't have magnetism and have a better weight than silica sand.

When the raw mortar revolves along the spin out of control chute surface, the different minerals will be separated in accordance to their particular specific gravity. Below the dual action of gravity and centrifugal force, the more the difference in mineral specific the law of gravity, the greater the splitting up degree will be. It really is worth noting that mineral morphology also has a certain influence on the separation of spiral chute. The particular flake minerals are easy to separate from the granular minerals. Therefore, the separation of quartz mortar body can be split into three components when the spin out of control chute can be used to split up the silica sand slurry: granular heavy nutrient area, granular silica sand area, flaky and light nutrient area, which can not only take away the heavy mineral in the silica sand, but also remove some sheets of mica nutrients.

4. Flotation method

If there are extensive mica minerals in the raw materials, it is impossible to fully remove the impurities only by using the spiral chute. In addition, if the raw material also contains a certain proportion of feldspar minerals who have a similar specific gravity to silica sand, the flotation process can be used to remove these impurities nutrients. At the same time, it is necessary to raise the grinding fineness when the silica fine sand and gangue nutrients do not achieve a certain diploma of monomer dissociation.

Here is the flotation process:

Adopting the three-stage flotation process to remove the mica and feldspar nutrients from silica fine sand respectively. Within the first stage flotation, the iron-containing argillite is extracted from the slurry by the corresponding flotation reagent system within a neutral or weakened acid environment. Inside the secondary flotation, the mica nutrients and their symbionts with silica fine sand are extracted from the slurry by the corresponding flotation reagent system under neutral or weakened acid conditions. Within the 3 rd phase flotation, the feldspar minerals and their symbionts with silica sand from slurry by the related flotation reagent system under neutral or weak acid atmosphere.

5. Pickling method

The pickling method can be followed if the color of the completed sand or the product sand after the separation functioning is red and the high content of iron and titanium does not satisfy the quality requirements of the product.

The above are process and the device used in the impurity elimination of silica fine sand. Carrying out the impurity removal when the impurity nutrient and silica fine sand reach the condition of monomer dissociation can remove almost all the impurity mineral in the raw material, and greatly increase the chastity of silica fine sand, to be able to obtain the corresponding silica fine sand concentrate.

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