Gypsum Grinding Machine

Gypsum Grinding Machine

Complete set of gypsum grinding machine includes crusher, bucket elevator, storage bin, vibrating feeder, micro-grinding main machine, frequency classifier, double cyclone dust collector, pulse dust removal system, high pressure fan, air compressor, Electrical control system.

Graphite has the following special properties due to its special structure:

High temperature resistance: The melting point of graphite is 3850б└50буC, and the boiling point is 4250буC. Even if it is burned by arc, the weight loss is small and the coefficient of thermal expansion is small. The strength of graphite increases with increasing temperature, and at 2000 бу C, the strength of graphite is doubled.

Conductivity, thermal conductivity: The conductivity of graphite is one hundred times higher than that of ordinary non-metallic minerals. Thermal conductivity exceeds metal materials such as steel, iron, and lead. The thermal conductivity decreases with increasing temperature. Graphite is electrically conductive because each carbon atom in graphite forms only three covalent bonds with other carbon atoms, and each carbon atom still retains one free electron to transport the charge. Lubricity: The lubricating properties of graphite depend on the size of the graphite scale. The larger the scale, the smaller the friction coefficient and the better the lubrication performance.

Chemical stability: Graphite has good chemical stability at room temperature, and is resistant to acid, alkali and organic solvents.

Plasticity: Graphite has good toughness and can be rolled into very thin sheets.

Thermal shock resistance: When graphite is used at room temperature, it can withstand the dramatic changes in temperature without damage. When the temperature is abrupt, the volume of graphite does not change much and cracks are not generated.

When the gypsum grinding machine is working, the main motor drives the main shaft and the turntable through the reducer, and the roller pin on the edge of the turntable drives dozens of grinding rolls to roll in the grinding ring raceway. The bulk material is broken into small particles by a hammer crusher and then sent to the storage bin by the hoist. Then, through the vibrating feeder and the inclined feeding pipe, the material is evenly sent to the bulk disc of the upper part of the turntable. The material is scattered to the circumference of the circle under the action of centrifugal force, and falls into the raceway of the grinding ring, which is impacted, rolled and ground by the ring roller. After the processing through the three-layer loop, it becomes powder, and the high-pressure fan passes the external air through suction. Inhaled into the gypsum grinding machine and the pulverized material is brought into the classifier. The rotating impeller in the classifier re-grinds the coarse material, and the fine powder that meets the requirements enters the cyclone dust collector with the airflow and is discharged from the lower discharge valve, and the airflow with a small amount of fine dust passes. The pulse dust collector is purified and discharged through a fan and a muffler.

Main uses after graphite milling:

1. As refractory material: Graphite and its products have the properties of high temperature resistance and high strength. They are mainly used in the metallurgical industry to manufacture graphite crucibles. In steelmaking, graphite is commonly used as a protective agent for steel ingots and the inner liner of metallurgical furnaces.

2. Conductive material: used in the electrical industry as a positive electrode for the manufacture of electrodes, brushes, carbon rods, carbon tubes, mercury positive flow devices, graphite gaskets, telephone parts, coatings for television picture tubes, etc.

3. Wear-resistant lubricants: Graphite is often used as a lubricant in the machine industry. Lubricating oils are often not used under high speed, high temperature and high pressure conditions, while graphite wear resistant materials can work at high sliding speeds of 200~2000 буC without lubricating oil. Many equipments that transport corrosive media are widely used in graphite materials to make piston cups, seals and bearings. They do not need to be lubricated during operation. Graphite milk is also a good lubricant for many metal processing (drawing, drawing).

4. Graphite has good chemical stability. Specially processed graphite with corrosion resistance, good thermal conductivity and low permeability for heat exchangers, reaction tanks, condensers, combustion towers, absorption towers, coolers, heaters, filters, pumps device. Widely used in petrochemical, hydrometallurgy, acid and alkali production, synthetic fiber, paper and other industrial sectors, can save metal materials.

5. Casting, sanding, compression molding and pyrometallurgical materials: Because graphite has a small thermal expansion coefficient and can withstand rapid cooling and rapid changes, it can be used as a mold for glassware. After using graphite, ferrous metals can be used to obtain accurate casting dimensions and high surface finish yield. It can be used without processing or a little processing, thus saving metal. Production of cemented metallurgy and other powder metallurgy processes, usually made of graphite materials for stamping and sintering of porcelain boats. Crystal growth of single crystal silicon, regional refining vessels, bracket fixtures, induction heaters, etc. are all processed from high purity graphite. In addition, graphite can also be used as a vacuum smelting graphite heat insulation board and base, high temperature resistance furnace tube, rod, plate, grid and other components.

6, for the atomic energy industry and the defense industry: graphite has a good neutron moderator for use in atomic reactors, uranium-graphite reactor is currently a more widely used atomic reactor. The decelerating material in the nuclear reactor as a power source should have high melting point, stable and corrosion resistance, and graphite can fully meet the above requirements. The purity of graphite used as an atomic reactor is very high, and the impurity content should not exceed tens of PPM. In particular, the boron content should be less than 0.5 PPM. In the defense industry, graphite is also used to make solid fuel rocket nozzles, missile nose cones, parts of space navigation equipment, insulation materials and radiation protection materials.

7. Graphite also prevents boiler fouling. The relevant unit tests have shown that adding a certain amount of graphite powder (about 4 to 5 grams per ton of water) in water can prevent scaling on the boiler surface. In addition, graphite is coated on metal chimneys, roofs, bridges and pipes to prevent corrosion and rust.

8. Graphite can be used as pencil lead, pigment, and polishing agent. After special processing of graphite, various special materials can be produced for the relevant industrial sectors.