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1. Production process of activated carbon by direct crushing of raw coal. Process characteristics: The process is simple, and the production cost is low. Raw material suitability: high-quality non-stick or slightly sticky coal, certain high-quality low-rank coals. Disadvantages: High requirements for raw materials, poor product performance, narrow range of applications, and low price. 2. Production process of coal-based columnar activated carbon Process characteristics: The coal-based activated carbon products manufactured have a wide variety, excellent quality, good performance, and a broad range of applications. Raw material suitability: Almost all raw coals that can be used for the production of coal-based activated carbon ； It can also be applied to the production of activated carbon for coal blending ； High-quality or coal-based activated carbon with special properties can also be conveniently produced using catalytic activation methods. Shortcoming: The manufacturing process is relatively complex ； Adhesives need to be added, which increases costs on one hand and adds to environmental burdens on the other. 3. Production process of coal-based compressed activated carbon Process characteristics: The coal-based activated carbon produced has excellent quality and good performance, making it particularly suitable for use in water treatment applications. Compared with activated carbon produced by the direct crushing of raw coal, the product has high strength and an appropriate bulk density due to the use of high-pressure molding technology ； Compared with coal-based columnar activated carbon, it has lower production costs and less environmental pressure due to the almost complete absence of binders. Raw material suitability: High requirements are placed on the raw coal; it must possess a certain degree of cohesion as well as good reactivity ； It can be applied to the production of activated carbon for coal blending ； High-quality or coal-based activated carbon with special properties can also be conveniently produced using catalytic activation methods. Shortcoming: The manufacturing process is relatively complex ； Researching suitable additives is highly challenging ； High-performance high-pressure rolling equipment currently needs to be imported. 4. Production process of coal-based spherical activated carbon Process characteristics: The coal-based activated carbon produced has uniform particle size and quality, as well as excellent performance, making it suitable for applications with strict requirements regarding particle size. Raw material suitability: Very strict requirements are placed on the raw coal, which must possess strong cohesiveness ； High-quality or coal-based activated carbon with special properties can be conveniently produced using catalytic activation methods. Shortcoming: The manufacturing process is extremely complex ； Researching suitable additives is highly challenging ； Controlling particle size is difficult. Production process of coal-based powdered activated carbon: Process characteristics: The process is the simplest, and the production cost is low. Raw material suitability: highly active low-rank coal. Disadvantages: Poor product performance, narrow range of applications, and low price. It is generally produced as a by-product of coal-based shaped activated carbon or activated carbon obtained directly from the crushing of raw coal.