Baxter coke powder recombination process and equipment

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Coke dust recycling refers to the process of processing coke dust, a by-product generated in coking operations, and then reintroducing it into coal for further coking. Coke dust has a high calorific value, and it is sold at low prices as a regular fuel; this not only wastes energy but also causes pollution, with many companies having large quantities of it piled up waiting to be sold. Process it and utilize it for coke production again, turning waste into treasure to benefit both enterprises and the public. Reusing coke powder not only helps reduce costs but also aligns with the broader trend toward energy conservation and environmental protection. It requires minimal investment yet yields significant returns; it is undoubtedly an excellent investment opportunity. By building and putting it into operation as soon as possible, one can gain an advantage by reducing costs. It fully meets the construction principles of various companies: spending less money, achieving significant results, and obtaining quick and effective outcomes. Economic benefits of recycling coke powder. Coke dust is produced by the enterprise for its own use, eliminating the need for external procurement or long-distance transportation. It also does not shrink during the coking process; in other words, adding 1 ton of coke dust can result in an increase of 1 ton of coke production while saving 1.3 tons of coal. Therefore, the economic value of using coke dust as a supplementary material is **higher than that of any type of lean coal, low-grade coal, or anthracite. Reusing coke dust can increase its value by 300–500 yuan per ton, and it can reduce the overall cost of the final coke by 10–15 yuan per ton. To date, dozens of coking enterprises in China have carried out production practices involving the reuse of coking dust, and all have confirmed its feasibility. Due to its porous surface and large specific surface area, coke dust is inert during the coking process; it has a large contact area with the liquid active components, and the bonding between them relies on the adsorption of the liquid phase by the solid particles. On the one hand, coke powder reduces the amount of volatiles released during the shrinkage and curing stages of semi-coke, thereby lowering the degree of shrinkage in both stages ； On the other hand, due to the porous structure, the stress generated by the shrinkage of the coke cake is reduced, thereby decreasing the porosity of the coke. The results in both aspects lead to an increase in the lump size and crush resistance of coke, with the M40 and M25 values rising by 1–2%. Therefore, in past production practices, coke powder was often used as a thinning agent and a reinforcing agent. General requirements for reusing coke dust: the particle size of the coke dust should be less than 0.5 mm, with 80% of it being less than 0.2 mm; the proportion to be added to the coal is generally kept below 3%, and it should be mixed uniformly into the coal. There is no need to worry about the impact of returning coke dust on the hot strength of coke; on one hand, this is because the proportion added is very low ； On the other hand, coke dust acts as a reinforcing agent in coking and helps to reduce cracks; therefore, it has no negative effect on strength and even leads to a slight increase in it, fully meeting the requirements for hot strength in large blast furnaces. In 2000, at the request of our clients, our company began conducting feasibility studies and equipment selection for the reuse of coke powder. Initially, we focused on the impact of factors such as the ratio of reuse and particle size on the quality of coke. By referring to various tests conducted by coking enterprises and other research institutions, as well as the actual recombination results from users, the feasibility of reusing coke dust, along with the requirements regarding its mixing ratio and fineness, has been demonstrated. The work in the second phase mainly involves selecting appropriate processing equipment and conducting tests at the user’s site. Over a period of three years, equipment such as ball mills, Raymond mills, roller mills, air-classifying universal mills, hammer crushers, and vibration mills was tested one after another. During this period, various sorting equipment was also selected. Attempts were made to sort coke particles in order to use them in conjunction with grinding machinery for the processing tasks, and control measures were applied to the moisture content during the tests to determine its impact on the processing. Ultimately, by considering various test data, the Baxter grinder was selected as the optimal solution. In 2003, Baiter’s processes and equipment were officially installed and put into operation at three coking enterprises in China, with the actual operating parameters meeting the design specifications. It has passed the testing by **authoritative institutions in the machinery industry. In 2007, the reliability, cost-effectiveness, environmental friendliness, and maintenance performance of the Baxter grinder and its overall process were verified after three years of use by customers, earning them positive feedback. And it was granted a **patent**. With a rigorous attitude and scientific methods, success was achieved after 7 years of effort. The mature, reliable, energy-efficient, advanced, and environmentally friendly Baiter coke powder recycling process and equipment will surely bring significant economic and social benefits to coking enterprises.