Abstract: The tilting narrow upflow classifier can not form a gravity flow of the feed when used in close circuit with grinding mill due to its great height and requires power for pumping. In view of this, new classification equipment is developed- tilting narrow upflow spiral classifier, which is based on the combination of tilting narrow flow classifier and spiral sand lifter. Its industrial test in Gejiu Kafang Concentrator of Yunan Tin Corp. shows that, compared with the site used spiral classifier, tilting narrow upflow spiral classifier can raise the quality efficiency of classification by 3~15 percentage points and reduce the unit energy consumption by 45% while the capacity per unit cost is 2.14 times that of spiral classifier.

Key words: Tilting narrow upflow spiral classifier, Industrial test, Quality efficiency of classification