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With the progress of beneficiation technology, the proportion of fine-grained tailings in beneficiation production is gradually increasing, which makes the requirements for hydraulic classification equipment for filling higher and higher. In view of the high proportion of fine-grained tailings for filling in Jinfeng Gold Mine, Guizhou, and the serious aging of hydraulic classification equipment, this paper studies the optimization of hydraulic classification equipment selection. The necessity and equipment parameters of replacing hydraulic classification equipment are determined through material balance calculation. The effect of replacing hydraulic classification equipment is evaluated from 5 aspects: tailings particle size, underflow yield rate, aggregate concentration, production test block strength and economic benefit. [ABSTRACT FROM AUTHOR]