30 3 月 2023

Sereral Mineral Processing Methods of Quartz Sand

Quartz sand and quartz sandstone impurity analysis process refers to the use of crushing, grinding, classification operation process, the natural quartz sandstone ore grinding and impurities and minerals to reach the monomer dissociation state, and then through the classification operation to obtain the raw material quartz sand in line with the size requirements, for the subsequent quartz sand impurity removal operation preparation.

Specific technological process

Natural quartz sandstone ore is broken into small pieces by jaw crusher, and then wet ground by grinding equipment to grind the small quartz ore into finer grained quartz sand. The wet grinding process can not only eliminate the dust produced in the grinding process, but also make the quartz particles friction with each other, and promote the quartz surface attached impurities (such as iron oxides and hydroxide, etc.) dissociate from the quartz particles. Subsequently, the grinding minerals enter the classification operation. The quartz sand that meets the particle size requirements can be used as the raw quartz sand to remove impurities in the next step, and the coarse grains are returned to the grinding equipment for re-grinding.

Purification Technology and Equipment of Quartz Sand

Quartz sand impurity removal process is to remove mineral impurities in quartz sand by scrubbing and desliming, magnetic separation, chute gravity separation, flotation, pickling or several methods, and obtain high purity quartz sand with particle size and impurity content that meet the requirements.

1. Scrubbing and desliming

 

With the mechanical force of the scrubbing machine and the grinding and stripping force between the sand grains to get rid of the film iron, bonding and mud impurities mineral deposits on the surface of the quartz sand, and further wipe the mineral deposits into monomer aggregate, and then reach the role of further purification of silica sand by the classification operation.

2. Magnetic Process

Magnetic separation is one of the effective methods to remove iron impurities from raw materials. Because the hematite, limonite, biotite and other minerals contained in the raw material have weak magnetism, the use of wet magnetic separator in the magnetic field intensity of 8×105A/m (ampere /m) above can be selected; And for the strong magnetic minerals containing miscellany mainly magnetite, the low intensity magnetic separator or medium magnetic separator is used for sorting. In order to further remove a small amount of other weak magnetic minerals (such as amphibole, pyroxene and the symbiosis of magnetic minerals and quartz), a high-gradient magnetic separator with a magnetic field intensity greater than 12000 Gauss can be used for secondary magnetic separation.

3. Spiral Chute Gravity Separation Method

When the raw material contains a small amount of heavy mineral impurities (such as zircon), the spiral chute gravity separation method can be used to effectively remove such heavy mineral impurities because it is not magnetic and has a higher gravity than quartz. When the raw material mortar body rotates down along the spiral chute surface, various minerals will be separated according to their specific gravity, under the dual action of gravity and centrifugal force, the greater the difference in mineral specific gravity, the higher the degree of separation. It is worth noting that mineral morphology also has a certain effect on the sorting of spiral chute, flake minerals are easier to separate from granular minerals. Therefore, when the spiral chute is used for sorting the raw quartz mortar body, the quartz mortar body can be divided into three parts: granular heavy mineral area, granular quartz sand area and flake mineral and light mineral area. In this way, the use of spiral chute to remove heavy minerals in quartz sand at the same time, also can remove part of flake mica minerals.

4. Flotation Method

If there are many kinds of mica minerals in the raw material, it is impossible to completely remove the impurities by spiral chute alone. In addition, if the raw material still contains a certain proportion of feldspar minerals similar to quartz, the flotation process can be used to remove these impurities. At the same time, when quartz minerals and gangue minerals do not reach a certain degree of monomer dissociation, it is necessary to increase the grinding fineness.

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