Quartz sand, also known as silica sand, is a silicon dioxide material processed from natural crystals and quartz minerals or chemically synthesized. Quartz products have the characteristics of high hardness and low expansion coefficient, and perform well in high temperature resistance, corrosion resistance, light transmission, chemical stability, electrical insulation, etc., and are widely used in casting, building materials, electric light sources, optical fibers, photovoltaics, etc. , semiconductor and other fields.
1 Silica sand production process
At present, the production process of quartz sand mining enterprises can be divided into wet method and dry method.
Dry silica sand production process:
"Raw ore—coarse crushing by jaw crusher—intermediate crushing—after sieving to remove soil—rod mill grinding—magnetic separation—coarse separation—fine separation—finished sand"
Dry sand making is not restricted by the environment, and it can be produced even in areas where water resources are extremely scarce. The dry method of sand making is to remove the powder through the powder classifier, and the content of stone powder can be adjusted according to the demand, so as to meet the standard of construction sand. The separation accuracy of dry sand making is high, and the particle size of the finished product can be controlled above 90 μm, which is suitable for the production of machine-made sand at all levels.
Wet silica sand production process:
"Raw ore - coarse crushing - medium crushing - pre-screening - grinding - desliming - coarse classification - desliming - (plate magnetic separator) roughing - (vertical ring high gradient magnetic selection machine) selection - fine particle classification - dehydration"
The wet sand making process has a longer history than the dry sand making process. The stone powder is washed and removed by a sand washing machine (wheel type or spiral type). The wet sand making process is more suitable for rainy or water-rich places in the south.
Magnetic separation plays an important role in the production of quartz sand.
2 Factors affecting the effect of magnetic separation
Magnetic separation is a widely used and effective method to remove iron impurities and magnetic minerals, and the effect of magnetic separation directly affects product quality. Practice shows that the main factors affecting the effect of magnetic separation are as follows:
①Magnetic difference of minerals
②The fineness and particle size composition of selected minerals
③ Mineral mudification
④Magnetic separation process
⑤Magnetic separation equipment
3 Functional characteristics of different magnetic separation equipment
The performance of magnetic separation equipment is an important factor affecting the effect of magnetic separation, mainly including magnetic field strength, magnetic field gradient, structural characteristics, etc., which should be selected according to the characteristics of different minerals.
Electromagnetic and permanent magnet devices are simple, effective, low in cost, and widely used, but their magnetic field is weak, and their effect on processing minerals with weak magnetic properties is very poor.
Superconducting magnetic separator is a device that uses superconducting magnets to separate minerals. In non-metallic ore beneficiation, conventional magnetic separators can better remove paramagnetic minerals or ferromagnetic minerals with high magnetic susceptibility. The lower limit of particle size can be as low as 20μm, but the cost is higher.
The high-gradient magnetic separator improves the magnetic field force and the processing capacity of the magnetic separator through the interaction between the magnetic medium and the particles, and is mainly used to solve the separation problem of fine-grained minerals. Vertical ring high gradient magnetic separator is the key core high-end mineral processing equipment for the separation of weak magnetic low-grade metal ore and the removal of iron for non-metallic ore in the mining industry.
4 vertical ring high gradient magnetic separator
Weifang Guote Mining Equipment Co., Ltd. (abbreviation: Guote Equipment) is one of the few enterprises in China that can provide professional EPC mineral processing general contracting services for non-metallic ores such as quartz sand and potassium albite feldspar. The vertical ring high gradient magnetic separator produced and sold by it has the following characteristics:
① Mature technology, energy saving and environmental protection! High purity and pollution-free
②The equipment is easy to operate and has a high degree of automation
③Large output, uniform particle size and higher sand forming rate
The whole production process is classified by drum sieve, blocking, and classifier multiple times, which improves the efficiency of the production line, reduces the loss of raw ore, and controls the tailing powder content.
④ High product quality, which can effectively reduce the iron content of quartz sand
The entire process of Guote Equipment is equipped with iron removal equipment, and the source is controlled to minimize the pollution of sand during processing.
5 "Guote" brand contributes to the development of the quartz sand industry
Weifang Guote Mining Equipment Co., Ltd. (abbreviation: Guote Equipment) was established in 2013. For many years, the company has been committed to the research and development and manufacture of special equipment for quartz sand, potassium albite feldspar and oil fracturing sand. It is a company that provides the whole line A modern company integrating testing, production, installation and commissioning. At present, the main products of Guote Equipment include quartz sand making equipment, magnetic separation equipment, grading equipment, screening equipment, dehydration equipment, etc.