Quartz sand is a kind of non-metallic minerals. In industry, quartz sand can be widely used to make glass, produce metal silicon, organosilicon compounds, etc. The main extractable component of quartz is silica, which can be purified by various beneficiation methods and then smelted to make various materials.
There are many kinds of quartz sand beneficiation and purification processes, such as: scrubbing, flotation, magnetic separation, gravity separation, acid leaching process, etc. The following are mainly the quartz sand magnetic separation process and related mineral processing equipment.
The quartz sand magnetic separation process will follow several parts: crushing - wet grinding - classifying - iron removal (magnetic separation).
The quartz sand crushing process is mainly to separate the quartz sand from other gangue minerals through crushing.Generally use three crushing process, respectively, coarse, medium and fine crushing process.
Coarse crushing of quartz sand: jaw crusher is often used for coarse crushing in this operation. The mined quartz sand ore is fed into the jaw crusher for crushing. The ore is crushed to about 25mm, and then sent to the screening machine by the belt conveyor for screening. The ore particles ( > 25mm) above the sieve are re-crushed in the jaw crusher, while the ore particles( < 25mm) below the sieve are sent to the middle crushing process by the belt feeder.
Secondary crushing of quartz sand: When the quartz sand is crushed, it is generally possible to use a hammer crusher for secondary crushing, and sometimes a jaw crusher is used. After coarse crushing, the product is crushed by a hammer crusher, and the particle size of the product is in the range of 15mm. The ore particles larger than this size continue to be crushed, and the ore particles smaller than this size enter the fine crushing operation.
Fine crushing of quartz sand: Cone crusher is generally used for fine crushing. Because the cone crusher has the advantages of fine crushing particle size, uniform particle size and large processing capacity, it can usually crush the ore particles finely to less than 9mm. The crushed to qualified materials are sent to the grinding operation by the belt feeder to further realize the dissociation of monomers.
Quartz sand crushing and screening equipment mainly includes: jaw crusher, cone crusher, impact crusher, hammer crusher, roller crusher, circular vibrating screen, linear vibrating screen, etc.
The purpose of the grinding operation is to dissociate the quartz mineral further to achieve the required particle size (0.106-0.425mm or 40-140 mesh) for the production of glass. One stage grinding-classification process is often used.
The crushed and qualified materials are sent to the rod mill for grinding. The ground fine-grained materials are fed into the desliming bucket for desliming and dehydration. Then the material is fed into a cylindrical screen (or hydraulic classifier) for classification. The coarse sand with particle size over 0.425mm is returned to the rod mill for regrinding. The particle size of 0.106～0.425mm is qualified product, and the fine sand less than 0.106mm is removed as tailings.
Quartz sand grinding and classification equipment includes: wet rod mill, wet ball mill, spiral classifier, cylinder screen, hydraulic classifier, hydrocyclone, high-frequency vibrating fine screen, etc.
The main purpose of the magnetic separation process of quartz sand is to remove iron impurities dissociated during the rod grinding process, such as limonite, hematite, biotite and tourmaline and other weak magnetic minerals. Medium-strength magnetic separation process is often used.
The qualified products after classification are sent to the drum-type permanent magnetic separator for medium-strength magnetic separation. Its field strength is 0.6T. The quartz sand obtained after magnetic separation also contains a small amount of impurities such as weak magnetic iron oxide. Therefore, you also need to use a high gradient magnetic separator (the magnetic field strength is about 13,000 oersteds) for strong magnetic separation to completely remove iron impurities and achieve quartz sand purification.
Quartz sand magnetic separation (iron removal) equipment mainly includes: iron remover, cylindrical permanent magnetic separator, high gradient magnetic separator, magnetic bar chute, magnetic plate magnetic separator, etc.
The above is the quartz sand magnetic separation process and related beneficiation equipment. In the actual concentrator, according to the different ore properties of quartz sand and the different types of impurities contained, the selected magnetic separation process is also different. Xinhai recommends to customize the suitable quartz sand magnetic separation process and related mineral processing equipment after passing the mineral beneficiation test and scientific and reasonable analysis.
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