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.