Silicon is the second most abundant element on earth, and high purity silicon dioxide is also widely used in various high and new technology industries, such as electronics, communication, laser, aerospace technology, etc. With the development of high and new technology industries, the requirements for the purity and quantity of high purity silicon dioxide are getting higher and higher.The main source of high purity silica is the purified quartz sand.Therefore, it is of great significance for China's national industry to popularize the purification technology of quartz sand.
Weifang guote mining equipment co., LTD. Is a modern enterprise specialized in producing quartz sand, silica powder and feldspar processing equipment and providing non-metallic ore production line experiment, design, consultation and supply of the whole line.Associated with quartz sand production of various products of the company, including the high field strength plate type magnetic separation machine, sand making machine, washing machine, air classifier, dust collector, hydraulic classifier, scrubbing machine, flotation machine, electromagnetic, magnetic separator, drum permanent magnetic iron remover, dry wet magnetic separator, the electromagnetic vibration feeder, metal detector, screw conveyor, quantitative feeding speed regulation says, centralized control system, etc.
The following are the methods of quartz sand purification:
I. physical methods:
The physical methods are mainly water washing and fractional desilting, scrubbing, magnetic separation, flotation and ultrasonic method.
1. Washing and grading desliming. For quartz sand containing a large amount of clay minerals, it is very important to conduct water separation and grading desliming of raw ore in screening.However, it is only a pretreatment method for ores, but the effect is not obvious for thin film iron and adhesive impurity minerals that exist on the surface of quartz sand.The air classifier produced by our company is a kind of powder classifier which is made by rotating centrifugal impeller.Single stage vertical classifier structure features: this classifier impeller placed vertically and concentric with the cylinder, classification impeller diameter dozens of mm to several thousand mm, classification power can be from a few to a few hundred kilowatts.Grade fineness can be from dozens to thousands of mesh.Multi-level vertical classifier product overview: the machine is a single vertical classifier for the unit series, can be at the same time the material classification into multi-level products.
2, scrub is the use of mechanical force and sand between the grinding and stripping force to remove the surface of the quartz sand film iron, bond and muddy impurity minerals and further wipe off the monomer mineral aggregate, and then achieve further purification of quartz sand grading effect.The quartz ore washing machine produced by our company adopts the stirring principle of mixer, and the materials roll continuously in the barrel, push and interact with each other, so that the material can be cleaned more cleanly.It's more efficient.The equipment has strong adaptability, 1-300mm particle size, rubber lining, wear-resistant and pollution-free.At the same time, the internal is equipped with secondary high-pressure cleaning device, cleaning more thoroughly, high efficiency.The whole set of equipment is simple and reasonable in structure, simple in operation, low in failure rate and convenient in maintenance.We can also be equipped with sewage treatment system according to customer requirements, cleaning water recycling, energy saving and environmental protection without pollution.
3, magnetic separation method refers to the use of strong magnetic machine, medium magnetic machine, weak magnetic machine to remove the magnetic iron.To maximize the removal of quartz sand particles containing some impurities, hematite, limonite and biotite and other weak magnetic impurity minerals and magnetite based ferromagnetic minerals.
The company produces high field strong plate magnetic separators, drum magnetic separators, dry wet magnetic separators, these magnetic separators can play a very good magnetic separation effect.GTGB series high field strong plate magnetic separator is our company's latest research and development of high gradient, high field strong magnetic separator equipment.High magnetic field intensity, large sweeping area, good iron removal effect.
4. Flotation method is to use fluorine, anion mixed collector to remove feldspar, mica and other non-magnetic associated impurity minerals in quartz sand.At present, there are two main methods of fluorine flotation and fluorine-free flotation.Fluorine flotation is polluted and replaced by non - fluorine flotation.The flotation machine produced by our company is composed of a slurry tank, a stirring device, an inflating device, a demineralizing bubble discharge device, and an electric motor, etc. It has the advantages of large suction capacity and low power consumption.Mechanical stirring, self - suction, self - suction pulp.The impeller has a reclining upper and lower blade.The upper blade produces slurry and the lower blade produces slurry and the upper cycle.Each tank has three functions of suction, pulp suction and flotation, and forms a flotation loop by itself, without any auxiliary equipment. Horizontal configuration facilitates process design.
5, ultrasonic method refers to the intense impact of ultrasound, so that the surface of the particle microimpurities or spray film particle surface peeling, in the role of dispersant become fine suspended matter, from quartz sand, quartz sand purity is improved.
6, the electrical separation method is the use of quartz and impurity minerals in the electricity on the small difference, choose a small amount of metal impurity minerals.
7. Thermal bursting method is to heat silicon dioxide to a certain temperature and then the inclusion in the mineral will burst, so that the impurities in the inclusion can be removed.
8. Thermal chlorination can remove impurity minerals and metal inclusions in the quartz bubble phase.
Chemical methods
1. Acid immersion method
Acid leaching method is to use the chemical properties of quartz sand that is insoluble in acid and most impurity minerals can be dissolved in acid solution to purify quartz sand.Acid leaching can be divided into single acid leaching and mixed acid leaching.The pickling equipment of our company produces large output, short reaction time, good whiteness, high purity, low cost and high efficiency. The whole process is simple, reasonable and easy to operate.At the same time, the equipment of our company is environment-friendly and pollution-free, and the tailings discharge meets the environmental protection requirements.
2. Network method
Complex legal is a medium strength of organic acids, react with impurities on the surface of the quartz sand, and also with the reaction of the impurity ions to form stable coordination compounds, reduces the concentration of impurity ions on the surface of the particles, as well as prevent ion precipitation in the process of washing, further reduce the impurity content in the quartz sand.
3, conclusion
Both physical and chemical methods play an irreplaceable role in the whole purification process of quartz sand.Our company specializes in the production of quartz sand equipment, welcome to inquire.
