Abstract: To address the challenge of producing ultra-low ash silicon coal from raw coal through single-pass washing on a large scale, Qinhua Coal Preparation Plant replaces the original two-stage three-product jig with an SKT four-stage five-product jig and implements corresponding modifications to the production process. Through systematic analysis of the characteristics of coal for industrial silicon smelting, raw coal quality, jig structure, separation efficiency, production data before and after the upgrade, and product economic benefits, the results indicate that the upgraded jig delivers stable product specifications, flexible variety adjustment, and a separation efficiency of 89.91%. This upgrade generates an additional annual economic benefit of approximately 147 million yuan for the enterprise, fully achieving the expected transformation goals. Production practice confirms that using a four-stage jig for single-pass washing of raw coal to produce ultra-low ash silicon coal is economically viable. This approach not only resolves issues associated with secondary rewashing of traditional jig clean coal, such as secondary transportation, secondary fine coal generation, and capacity occupation, but also avoids magnetite powder contamination compared to dense medium separation. Furthermore, it offers advantages of low production maintenance costs and a simplified process flow. This innovative technology opens a new pathway for ultra-low ash silicon coal production, demonstrating high potential for widespread application and promising market prospects.