The graphite which are in different properties should use different processing methods, we will give you a brief introduction:
Purification processing of the graphite products : the requirements of graphite products in modern industrial focus on the development of two aspects: the first, the requirements of large crystal scales to achieve high purity, and the second is required to achieve ultra fine graphite particles (such as less than 1 m or 0.5 m). Our company has established the production lines of graphite purification and fine powder processing , the purification method is mainly chemical purification. The most mature technology of graphite chemical purification is melting the caustic alkali and graphite at 700 DEG C, and then washing them to neutral, and then adding hydrochloric acid to treat and wash it so that the carbon content of the graphite can reaches 98% ~ 99%. There are also some manufacturers produce the high purity graphite with the hydrofluoric acid treatment.
Processing method for natural crystalline graphite: the natural crystalline graphite has good native floatability. in China , we are basically using the flotation method for processing. the method of multi - stage grinding and multi - selection is adopted to select large scale graphite as soon as possible because of the size of graphite flake is one of the most important quality indicators, The common collector for flotation is kerosene, diesel oil, etc., and the foaming agent is two oil, No. four oil, and the adjusting agent is lime and sodium carbonate.
Aphanitic graphite processing methods: the aphanitic graphite crystal is extremely small, so it’s also called microcrystalline graphite, the graphite particles are often embedded in clay, the separation is very difficult. Many graphite mines will crush and process the ore directly and then sell the graphite powder products because of the high grade ore (carbon containing is 60% ~ 80%). At present, some units are still in the process research of microcrystalline graphite flotation (such as oil agglomeration flotation, etc.).