The technological properties of graphite are mainly determined by its crystalline form. Crystalline morphology of different graphite minerals, with different industrial value and purpose. Industry, according to different crystalline morphology, the natural graphite into three categories.

　　1.dense crystalline graphite

　　Dense crystalline graphite is also called bulk graphite. Such graphite crystal clear crystal visible. Particle diameter greater than 0.1 mm. The crystal arrangement is disordered and the structure is compact and massive. This: the characteristics of graphite is high grade, general carbon content is 60 ~ 65%, sometimes up to 80 ~ 98%, but plasticity and smooth than that of flake graphite.

　　2.flake graphite

　　Graphite crystals are in the form of a scale; this is made of high strength under high pressure. This kind of graphite ore is characterized by high grade, generally in the 2 to 3%, or 100 to 25%. Is one of the best ore floatability in nature, which can take over HISTEP grade graphite concentrate. This type of graphite can be floating, lubricating, and more malleable than other types of graphite; therefore, it is the largest industrial value.

　　3.aphanitic graphite

　　Hidden quality graphite also known as amorphous or soil shaped graphite, the graphite crystal diameter, generally less than 1 micron, is a collection of microcrystalline graphite, only under the electron microscopy can be seen in the crystal. The characteristics of this kind of graphite is that the surface is ground, lack of luster, and poor lubrication. Higher grade. General 60 ~ 80%. A few more than 90%. Ore optional sex is poor.

       The graphite products are divided into two major categories of flake graphite and microcrystalline ink: flake graphite refers to the natural crystal graphite, the shape of covered, by crystal, flaky graphite ore processed, ore dressing, sometimes by purification products;Microcrystalline graphite has called earthy graphite or amorphous graphite, refers to the tiny natural graphite crystals composed of dense aggregate, by implicit crystal, earthy graphite ore processed, some after the separation, purification products.

　　Flake graphite according to fixed carbon content is divided into high purity graphite, graphite in high carbon graphite, carbon and low carbon graphite four types, according to the product particle size, fixed carbon content is divided into 212 kinds of brands, various grades of graphite products technical requirements are shown in table 4.13.2.High purity graphite (fixed carbon content is greater than or equal to 99.9%) is mainly used in flexible graphite sealing material, instead of platinum crucible is used for chemical reagent melting and lubricant base, etc.;High carbon graphite fixed carbon content (94.0% ~ 99.9%) is mainly used for refractory material, lubricant basic material, brush materials, electrical carbon products, battery materials, pencil, filling material and coating raw materials, etc.;Carbon graphite fixed carbon content (80% ~ 94%) is mainly used in the crucible, refractory materials, casting materials, casting paint, pencil raw materials, battery materials and dye, etc.Low carbon graphite (fixed carbon content is greater than or equal to 50.0% ~ 80.0%) is mainly used in casting coating.

        Microcrystalline graphite divided into iron requirement and no iron requirement 2 class, according to the product of fixed carbon content, the maximum size is divided into 60 brands, various grades of graphite products the appearance requirements shall not be visible to the naked eye in the wood, iron, stone grain and other sundry, product is not contaminated with other impurities, its technical requirements are shown in table 4.13.3.Microcrystalline acid soluble iron content in the ink is not greater than 1%, mainly used in pencil, batteries, electrode, graphite emulsion, graphite bearing of ingredients and raw material of battery carbon rod;No iron requirements of microcrystalline ink is mainly used for casting materials, refractory materials, dyes, electrode paste material, etc.

　　Graphite is used in a number of forms in refractories due to its ability to withstand intense temperatures. Alumina-graphite is used to construct nozzles and troughs. Graphite based bricks are used to line steel convertors, blast furnaces and electric arc furnaces.

　　Graphite is used to construct the anodes of all major batteries such as batteries used around the house in remote controls and battery powered toys. Graphite is particularly important in the construction of electric car batteries.

　　Natural graphite and synthetic graphite are both used as a carbon raiser in molten steel. This increases the carbon content in the steel.Graphite is used in the brake linings of large heavy vehicles.Fine flake graphite is used in a certain type of water-based paint that is used to prevent hot metal from sticking to molds.

　　Graphite is also used to produce lubricants to use at very high or very low temperatures. Forging die lubricants, anti-seize agents, gear lubricants are all made from graphite.Graphite is used as the marking substance inside pencils. It is normally mixed with clay to give it softer characteristics. It is also used in raw form as an artistic medium in sticks and flakes.It is also used in some electric motor brushes.

　　Expanded graphite is used to make graphite foil which is used to make bipolar plates in fuel cells and heat sinks for laptop computers.Expanded graphite is often used as a surface material for molten metal ladles and steel ingots to reduce heat loss.It is also used as fire stops around the edge of fire doors and as protective sheets around pipes to prevent fire damage.Specialized synthetic graphite is also used as a matrix and neutron moderator in nuclear reactors.

　　Synthetic graphite is used to create the electrodes that melt scrap iron and steel in electric arc furnaces due to graphite’s ability to conduct electricity.Graphite fiber is also used to reinforce plastics such as those used in fishing rods, golf clubs, bicycle frames and pool cues and heat-resistant components such as reinforced carbon-carbon.Graphite has also been used to create radar absorbent materials and smokeless powder.

　　　　Flake graphite, is wildly used in all kinds of industry field. Flake graphite molecular weight (C) 12.011, friction coefficient 0.08-0.20, Mohs hardness of 1.0 to 1.15, the proportion of 1.9 to 2.2 layered hexagonal crystal structure, inter-molecular bonds linking the network layer, melting point up to 4375 ℃, in 454 ℃ began oxide: at normal temperature, graphite is very small and lively.

　　Flake graphite can be produced to graphite foil, graphite foil can be produced to graphite packing rings, graphite strip, gaskets, composite plates, cylinder pad, paste in a variety of metal surfaces. Widely used in electric power, petroleum, chemicals, instruments, machinery and other industries machines, pipes, pumps, valves and static seal dynamic seal, is the ideal alternative to rubber, fluorine plastic, asbestos and other traditional seal of new sealing material

　　Graphite gasket (also known as high-strength pads) can be processed in accordance with the need to use the following forms: 1.2 Basic graphite gaskets. Edge graphite gaskets 3 package.4 pack outside graphite gaskets. Inner and outer edge of graphite gaskets. Hemming form graphite gaskets that maintain the excellent performance of the original gasket, and easy installation and removal, easy to damage, but also to prevent the erosion of the gasket medium to improve the pressure. Edging material used for 304 or 316 stainless steel. Inner reinforcing materials commonly used in ss304, ss316 or tinplate, thickness 0.1 ~ 0.127mm, in the form of enhanced sprint board, network board increase, flat enhancement.304 reinforced graphite commonly used materials, can be made ​​into a variety of circular geometry gasket is widely used in pipes, valves, pumps, pressure vessels, heat exchangers, condensers, generator, air compressor, an exhaust pipe , refrigerator and so on.