Expandable graphite is produced by two processes

Expandable graphite is produced by two processes: chemical and electrochemical. The two processes are different in addition to the oxidation process, deacidification, water washing, dehydration, drying and other processes are the same. The quality of the products of the vast majority of manufacturers using chemical method can reach the index stipulated in GB10688-89 “expandable graphite” standard, and meet the material requirements for the production of bulk flexible graphite sheet and export supply standards.

But the production of special requirements of low volatile (≤10%), low sulfur content(≤2%) of the products are difficult, the production process is not pass. Strengthening technical management, studying the intercalation process carefully, mastering the relationship between process parameters and product performance, and producing stable quality expandable graphite are the keys to improve the quality of subsequent products. Qingdao Furuite Graphite summary: electrochemical method without other oxidants, the natural flake graphite and auxiliary anode together constitute an anode chamber soaked in concentrated sulfuric acid electrolyte, through direct current or pulse current, oxidation after a certain time to take out, after washing and drying is expansible graphite. The biggest characteristic of this method is that the reaction degree of graphite and the performance index of the product can be controlled by adjusting the electrical parameters and reaction time, with small pollution, low cost, stable quality and excellent performance. It is urgent to solve the mixing problem, improve the efficiency and reduce the power consumption in the intercalation process.

After deacidification by the above two processes, the mass ratio of sulfuric acid wetting and adsorption of graphite interlamellar compounds is still about 1:1, the consumption of intercalating agent is large, and the washing water consumption and sewage discharge are high. And most manufacturers have not solved the problem of wastewater treatment, in the state of natural discharge, environmental pollution is serious, will restrict the development of the industry.