{"id":7964,"date":"2025-05-28T08:47:03","date_gmt":"2025-05-28T08:47:03","guid":{"rendered":"https:\/\/jinsuncarbon.com\/?p=7964"},"modified":"2025-05-28T08:48:20","modified_gmt":"2025-05-28T08:48:20","slug":"how-to-make-graphite-powder","status":"publish","type":"post","link":"https:\/\/jinsuncarbon.com\/hi\/how-to-make-graphite-powder\/","title":{"rendered":"How to Make Graphite Powder?"},"content":{"rendered":"

With the\u00a0electrical conductivity, lubrication and high-temperature resistance, graphite powder is widely used in fields such as batteries. And its manufacturing process varies depending on the raw materials,\u00a0which embodies material and industrial technological innovation. It includes\u00a0the purification of natural graphite, the synthesis and transformation of artificial graphite, and the preparation of new nano-scale graphite.<\/p>\n

\"How<\/p>\n

Raw Materials for Graphite Powder Manufacturing<\/h2>\n

Natural Graphite<\/h3>\n

Natural graphite<\/a> exists in mineral form in geological structures such as gneiss and schist. The distribution of its resources is regional\u00a0and according to its crystal form, it can be classified as:<\/p>\n

Flake graphite<\/strong><\/p>\n

The crystals are arranged in layers\u00a0and their\u00a0diameters range\u00a0from a few micrometers to several millimeters. Because of the\u00a0high purity and good electrical conductivity, you\u00a0can use it as anode materials for high-end batteries and flexible electronic materials.<\/p>\n

Earthy graphite<\/strong><\/p>\n

The crystal structure is disordered, which\u00a0is also known as\u00a0“cryptocrystalline graphite”. You need to enhance\u00a0its performance through deep purification. And it is widely used in refractory materials, casting coatings and other fields.<\/p>\n

 <\/p>\n

Raw Materials for Artificial Graphite<\/h3>\n

The core raw material of artificial graphite is a carbon-containing solid, commonly including:<\/p>\n

Petroleum coke<\/b><\/strong><\/p>\n

This is a\u00a0by-product of petroleum refining, whose\u00a0carbon content exceeds 90%. After calcination, it becomes a graphitization precursor and is the main raw material for the negative electrode of lithium batteries.<\/p>\n

\u00a0<\/b><\/strong><\/p>\n

Asphalt<\/b><\/strong><\/p>\n

It is divided into coal tar pitch and petroleum pitch, which are used as binders and carbon sources.\u00a0And they are carbonized at high temperatures to form a graphite layered structure.<\/p>\n

 <\/p>\n

Coke<\/b><\/strong><\/p>\n

It is a product of coal dry distillation, with low cost but more impurities. And it is suitable for medium and low-end scenarios such as refractory materials.<\/p>\n

 <\/p>\n

Carbon black<\/b><\/strong><\/p>\n

You can use it\u00a0as an auxiliary material in some special processes to regulate the pore structure.<\/p>\n

Manufacturing Process of Natural Graphite Powder<\/h2>\n

Primary Processing<\/h3>\n

Crushing and Grinding<\/b><\/strong><\/p>\n

You should\u00a0crush natural graphite ore to the millimeter level using equipment such as jaw crushers and cone crushers.\u00a0And then ground it to the micron-level particles by ball mills, Raymond mills, etc. During the grinding process, you need to control the particle size distribution\u00a0\u00a0to avoid damage to the crystal structure caused by overgrinding.<\/p>\n

 <\/p>\n

Classification and Screening<\/b><\/strong><\/p>\n

 <\/p>\n

Classify the particles by particle size using equipment such as vibrating screens and air flow classifiers. And return the coarse particles for re-grinding, while fine particles enter the purification process. The air classification method can precisely control the particle size within the range of 1 to 100\u03bcm, which meets\u00a0the requirements of different applications.<\/p>\n

 <\/p>\n

Purification Treatment<\/h3>\n

Flotation Method<\/h4>\n

This method takes\u00a0advantage of the difference in hydrophobicity between graphite and hydrophilicity of gangue minerals. First add the collectors such as kerosene and turpentine oil, as well as foaming agents. Then through a flotation machine, graphite particles are made to adhere to air bubbles and float up. Thus achieving separation from impurities such as quartz and feldspar\u00a0and the\u00a0purity can reach 85%-95%.<\/p>\n

 <\/p>\n

Alkali-Acid method<\/h4>\n

Alkali melting<\/b><\/strong><\/p>\n

You should mix the graphite and sodium hydroxide in proportion and melt\u00a0them\u00a0at 500-700\u2103. After that, the impurities (such as SiO2<\/b><\/strong>) are transformed into soluble silicates.<\/p>\n

 <\/p>\n

Acidification<\/b><\/strong><\/p>\n

After cooling, add hydrochloric acid or sulfuric acid to dissolve the silicate. And through\u00a0washing and drying, the purity can reach over 98%,\u00a0used for\u00a0medium and high-end battery materials.<\/p>\n

 <\/p>\n

High-temperature Method<\/h4>\n

Place the graphite powder\u00a0in an inert atmosphere furnace at a high temperature of 2500-3000\u2103. During this process, impurities (such as boron and aluminium) volatilize in gaseous form, with a purity of over 99.9%.\u00a0You can use it\u00a0in high-end fields such as semiconductors and nuclear industries, but the energy consumption is relatively high.<\/p>\n

 <\/p>\n

Raw Material Pretreatment<\/h3>\n

Calcination of petroleum coke<\/b><\/strong><\/p>\n

As a key raw material\u00a0for artificial graphite powder, raw coke contains hydrocarbon compounds and moisture, which needs to be calcined. You should place it in a tank calcination furnace or rotary kiln at 1200-1400\u2103 to allow the volatile components to escape.\u00a0This process can increase\u00a0the carbon content, enhance\u00a0the density, strength and electrical conductivity,\u00a0and\u00a0reduce\u00a0impurities.<\/p>\n

 <\/p>\n

Asphalt kneading<\/b><\/strong><\/p>\n

After calcination, you need to mix the petroleum coke with coal tar pitch in proportion.\u00a0Then put the mixture in a powerful kneader and stir and knead it at a specific temperature to form a mixture with good plasticity. Its viscosity and plasticity are precisely controlled, which\u00a0can meet the requirements of the molding process. \u200b<\/p>\n

 <\/p>\n

Forming and Heat Treatment<\/h3>\n

Forming Process<\/b><\/strong><\/p>\n

There are three common methods: extrusion molding, compression molding and isostatic pressing. Extrusion molding extrudes the blank through a die, which is suitable for continuous production. Compression molding involves applying pressure in a mold to form products such as cylinders and sheets.\u00a0Isostatic pressing is a process of isotropic compression under high pressure to increase density, which\u00a0is used for high-performance products.\u200b<\/p>\n

 <\/p>\n

Carbonization process<\/b><\/strong><\/p>\n

Slowly heat in an inert gas to 800-1200\u2103 to carbonize the binder and form an initial carbon structure.\u00a0Then\u00a0the organic matter decomposes to produce carbon and volatile gases, forming a pore structure,\u00a0which affects\u00a0the performance of the final product. \u200b<\/p>\n

\u00a0<\/b><\/strong><\/p>\n

Graphitization process<\/b><\/strong><\/a><\/p>\n

At high temperatures of 2000-3000\u2103, the amorphous carbon in the carbonized green body is rearranged into hexagonal lattice graphite crystals. This significantly enhances\u00a0key properties such as electrical conductivity, lubricity, and high-temperature resistance. \u200b<\/p>\n

 <\/p>\n

Post-processing<\/h3>\n

Crushing and Grinding<\/b><\/strong><\/p>\n

Graphite blocks were crushed by using equipment such as ball mills, vibration mills and jet mills to obtain different particle sizes.<\/p>\n

 <\/p>\n

Grading and Packaging<\/b><\/strong><\/p>\n

Classify the crushed graphite powder and produce\u00a0different products\u00a0according to the particle size specifications. After passing the quality inspection, it is packed in plastic woven bags, paper bags or sealed drums. It ensures\u00a0that transportation and storage are not contaminated.<\/p>\n

New graphite powder preparation technology<\/h2>\n

Preparation of Nano-Graphite Powder<\/h3>\n

5.1.1 Chemical Vapor Deposition<\/b><\/strong><\/p>\n

The CVD method uses methane and other gaseous carbon sources to form nano-graphite layers. This process requires the decomposition and deposition of the carbon source on the substrate at 800-1200\u2103 and under the action of a catalyst. The product has the high purity, which is suitable for the high-end electronic field, but the efficiency is low.<\/p>\n

 <\/p>\n

5.1.2 Ultrasound-assisted liquid-phase exfoliation method<\/b><\/strong><\/p>\n

This is to disperse natural graphite in solvents such as NMP, break the interlayer forces of graphite, and peel off to obtain nano-powder. The process is simple and features low energy consumption, allowing for mass production, suitable for scenarios with low uniformity requirements.<\/p>\n

 <\/p>\n

Manufacturing of Composite Graphite Powder<\/h3>\n

Composite process with metals and polymers<\/h4>\n

Metal composite<\/b><\/strong><\/p>\n

Powder metallurgy mixed sintering, then it has the lubrication and metal strength, which is used for self-lubricating components.<\/p>\n

 <\/p>\n

Polymer compounding<\/b><\/strong><\/p>\n

When graphite powder is compounded with polymers, the commonly used methods include solution blending and melt blending. It has electrical and thermal conductivity, which is used in industrial products that conduct electricity and heat.<\/p>\n

Quality Control and Environmental Protection Measures in the Manufacturing Process<\/h2>\n

Quality Inspection<\/b><\/strong><\/p>\n

The final finished product needs to be tested for properties such as particle size, purity and electrical conductivity. And appearance defects should be analyzed with instruments to ensure that the finished product meets the standards.<\/p>\n

 <\/p>\n

Environmental Protection Treatment<\/b><\/strong><\/p>\n

After manufacturing graphite powder, you need to carry out environmental protection treatment to prevent air pollution, water pollution, etc. For example, you can neutralize, settle and filter the wastewater to purify it. And remove the dust and harmful gases by using bag filters, electrostatic precipitators and scrubbers to reduce environmental impact.<\/p>\n

Conclusion<\/h2>\n

The production of graphite powder requires the selection of processes based on the characteristics of raw materials. Natural graphite focuses on purification,\u00a0artificial graphite emphasizes graphitization, and new technologies promote nanoscale and composite processes.\u00a0Meanwhile, you need to take into account both quality control and environmental protection requirements.<\/p>","protected":false},"excerpt":{"rendered":"

With the\u00a0electrical conductivity, lubrication and high-temperature resistance, graphite powder is widely used in fields such as batteries. And its manufacturing process varies depending on the raw materials,\u00a0which embodies material and industrial technological innovation. It includes\u00a0the purification of natural graphite, the synthesis and transformation of artificial graphite, and the preparation of new nano-scale graphite. Raw Materials […]<\/p>","protected":false},"author":3,"featured_media":7965,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-7964","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-carbon-graphite"],"yoast_head":"\nHow to Make Graphite Powder? | Jinsun Carbon<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jinsuncarbon.com\/hi\/how-to-make-graphite-powder\/\" \/>\n<meta property=\"og:locale\" content=\"hi_IN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Make Graphite Powder?\" \/>\n<meta property=\"og:description\" content=\"With the\u00a0electrical conductivity, lubrication and high-temperature resistance, graphite powder is widely used in fields such as batteries. 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And its manufacturing process varies depending on the raw materials,\u00a0which embodies material and industrial technological innovation. It includes\u00a0the purification of natural graphite, the synthesis and transformation of artificial graphite, and the preparation of new nano-scale graphite. 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