IMPROVED SCREEN-BOWL CENTRIFUGE RECOVERY USING POLYMER INJECTION TECHNOLOGY

摘要

Screen-bowl centrifuges are currently the most popular process for dewatering fine particles in the U.S. coal industry. Although these units typically provide acceptable product moistures, they often suffer from low recoveries of fine solids. Past attempts to improve solids recovery by adding conventional flocculants directly to the feed stream have been shown to have little, if any, positive benefit. However, recent field studies indicate that solids recovery can be significantly improved using a modified feed tube to inject custom designed polymer directly into the low-solids clarified pool within the rotating bowl section. This article presents several industrial case studies that demonstrate the impacts of this technology on screen-bowl centrifuge performance.