Nowadays, graphite has been regarded as one of the important industrial mineral raw materials at home and abroad, especially in recent years, graphite products have played an important role in all walks of life, people are also the graphite is also an important industrial raw materials, The development of many new uses, the international market demand growth year after year.
On the graphite industry in the development direction of deep processing
1, the development direction of graphite deep processing
According to the economic and technological development of the new graphite materials needs and the central, local and corporate industrial development planning, the proposed combination of production and research in the near future, mainly to deep processing, to achieve some important projects, building a complete industrial chain, guide the graphite industry health science To develop. Second, the development of carbon graphite material hot technology products, such as lithium-ion battery anode material, isotropic graphite, high thermal conductivity of graphite, such as the industrialization and intensification of the project.
In this case,
(1) graphite chemical purification efficient environmental protection
In this case,
Traditional graphite chemical purification methods are mainly three: alkali melting acid leaching method (ie, sodium hydroxide purification method), chlorination roasting method, hydrofluoric acid method. These three methods generally have the disadvantages of large dosage and high environmental pollution. At present, China has a green energy-saving advanced acid-base purification and energy-saving high-temperature purification technology, for resource characteristics, the construction of different types of large-scale purification of graphite production lines. The use of hydrofluoric acid, which severely pollutes the environment in chemical purification, is strictly limited.
(2) lithium natural graphite anode materials research and development
Lithium-ion battery widely used to promote the rapid development of spherical graphite can rely on resources, the natural graphite lithium-ion battery anode material industry scale, and for different grades of battery needs, research and development of different quality anode materials, product line; Safe, long-life natural graphite power type, energy storage battery anode material. With the rapid growth of lithium-ion battery demand, the anode material market prospect is very broad.
(3) natural graphite base isotropic graphite
Isotropic graphite is widely used in nuclear energy, silicon crystal preparation, EDM, continuous casting steel, aerospace and other fields, is the carbon material of high-end products, strategic materials. China’s current needs of the isotropic graphite 2/3 rely on imports. Conventional techniques for preparing isotropic graphite are complex and costly.
Microcrystalline graphite mineral particles are isotropic in nature, is a good raw material for the preparation of isotropic graphite, and can simplify the process and reduce costs, has prepared industrial-size samples, isotropic parameters of 1.04 (the highest requirements of nuclear Graphite 1.05). After the flake graphite is spheroidized, it also has the potential to prepare isotropic graphite.
(4) natural graphite-based high thermal conductivity material
The miniaturization of electronic equipment, requiring more and more high integration of electronic devices, making cooling become a key technology in the IT industry, the demand for lightweight high thermal conductivity material is growing. Flexible graphite as a heat-conductive material has been widely used in LED displays and many electronic products; the use of natural graphite’s excellent thermal conductivity, the preparation of thermal conductivity and copper equivalent or higher density only copper 1/4 high-end thermal conductivity materials, Wuhan Science and Technology University, Shanxi Coal Chemical Institute, Tsinghua University and other related technologies.
(5) flexible graphite products
China’s production of flexible graphite already has a certain scale, and with foreign advanced enterprises have a number of cooperation. But our products are mostly low-end products, different specifications of less than 1/5 of foreign countries. Production and research with a combination of research and development for the use of high-end products, improve the variety specifications, so that series, standardization is the development trend of today.
(6) expanded graphite environmental protection materials
Expansion of graphite on the water pollution of the adsorption treatment, has a large number of research results in the treatment of water bodies of oil and organic pollution, the expansion of graphite than the general use of activated carbon is now effective and economical. However, inconvenient transport of expanded graphite, need to be prepared at the application site. Expansion of graphite environmentally friendly materials, preparation, use, recycling, regeneration of a certain degree of technical difficulty, coupled with the past not enough attention to environmental protection, expansion of graphite environmental protection materials have not been able to industry. Now the expansion of graphite environmentally friendly materials, the industrialization of the technology base has been available, from two technical aspects of the project.
(7) Graphene
Graphene is a new material with unique properties: it has the same electrical conductivity as copper, and its thermal conductivity is superior to any of the known materials. It is transparent, only a small fraction (2.3%) of vertically visible visible light is absorbed by graphene, and most of the light passes through it. It is very dense, even the helium atoms (the smallest gas molecules) can not go through.
Graphene special structure, it has the world’s hardest, thinnest features, but also has a strong toughness, electrical conductivity and thermal conductivity.
As the excellent performance of graphite and a wide range of uses, will become non-metallic mineral industry leader. Hope that the graphite industry can further optimize the industrial structure, increase value-added products, the real China’s graphite industry bigger and stronger.