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Click to add WeChatThe main component of quartz sand is silicon dioxide. It has a wide range of applications. It has been used in many fields such as glass manufacturing, casting, ceramics, chemicals, construction, electronics, rubber and plastics. Although quartz sand has a wide range of applications, it needs to be purified through mineral processing due to its high impurities. The higher the purity, the higher its quality and added value. So, what is the purification process of quartz sand? What are the links? Let's learn about it together.
In general, the principle process of mineral processing of ore is basically crushing and grinding first, then sorting, and then dehydrating, and finally obtaining qualified concentrated minerals. Quartz sand is no exception. Therefore, its purification process is: initial crushing and screening, grinding and grading, sorting and dehydration process
Crushing: The initial crushing of quartz sand is the beginning. The mined ore is fed into the crusher equipment to be crushed to a certain particle size. The process depends on the size of the ore particles. It can be a closed-circuit crushing process, a two-stage closed-circuit crushing process or an open-circuit crushing process. The commonly used equipment in the workshop is mainly jaw crusher and impact crusher.
Screening: Screening is to feed the crushed ore particles into the screening machine for screening. The material under the screen is qualified for crushing and can enter the next stage of operation, while the material on the screen is unqualified material and needs to be returned to the crusher for further crushing. During the screening process, it is necessary to maintain uniform feeding to avoid blockage, and pay attention to the maintenance of the screen to ensure the screening effect. The equipment required for this link is mainly vibrating screen (circular vibrating screen, linear vibrating screen, self-centering vibrating screen), drum screen, etc.
Grinding: This stage is to grind the crushed ore particles into powder to separate the useful minerals from the gangue mineral monomers. The equipment required during this period can be ball mill and rod mill, which can not only improve the grinding efficiency, but also achieve fine control of particle size. According to the grinding particle size requirements, select the appropriate ball mill model and determine the grinding time to achieve the ideal grinding particle size.
Classification: The main method is hydraulic classification, which is a method of separating particles of different sizes by the difference in water flow velocity and particle settling velocity. Using this principle, particles that meet the specifications and particles that need further processing can be effectively distinguished, thereby improving the overall mineral processing efficiency. Commonly used equipment is mainly hydrocyclones and spiral classifiers.
Quartz sand can be sorted in a variety of ways according to the different impurities it contains and the different iron content, such as scrubbing, flotation, gravity separation, magnetic separation, etc.
Scrubbing: The process aims to remove dirt and impurities on the surface of quartz sand and improve purity. Common scrubbing equipment includes spiral sand washing machine, bucket sand washing machine, etc.
Magnetic separation: It is mainly used to remove iron impurities in quartz sand. By adjusting the magnetic field strength and magnetic separation time, it can effectively remove magnetic impurities and improve the purity of quartz sand. The commonly used magnetic separation equipment in this stage includes permanent magnetic drum magnetic separator, dry magnetic separator, wet magnetic separator, strong magnetic roller, etc.
Flotation: It is mainly used to achieve mineral processing through the difference in physical and chemical properties of the mineral surface, which can effectively separate impurities from useful minerals. In this process, it is necessary to add reagents, such as collectors, frothers, etc., to help the minerals react to complete flotation. The selection, dosage and concentration of reagents in the process are critical, and reasonable reagent standards need to be determined through mineral processing experiments. Commonly used equipment for flotation of quartz sand include SF flotation machine, JJF flotation machine, KYF flotation machine, XCF flotation machine and BF flotation machine.
The purpose of dehydration is mainly to remove the moisture in the quartz sand concentrate or tailings so that its moisture content reaches the specified standard. At present, dehydration technology mainly relies on several dehydration equipment, such as filters, filter presses, dehydration screens, centrifuges and cyclones. The dehydration standards are different, and the required equipment is also different. If you want to obtain concentrates with low water content, you can combine multiple equipment for dehydration to achieve the ideal requirements.
The above is the common process of quartz sand purification. In actual mineral processing plants, due to the differences in the ore properties of quartz sand, different processing volumes, and different purification requirements, the required purification schemes are also different. If you want to obtain high-purity quartz sand with high standards, low costs, and high efficiency, you need to determine the mineral processing process according to the properties of the ore. Therefore, it is recommended to conduct mineral processing tests and design a reasonable quartz sand purification process through experimental analysis.
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