Abstract: Based on the analysis of some problems in the common pinched sluice, the new arc bottom pinched sluice is produced by changing the methods of cutting minerals as opening wide mouth in bottom for heavy minerals, and changing the shape of the pinched sluice bottom as curved surface. With use of the common pinched sluice and the new arc bottom pinched sluice, the one-stage coarse contrast experiments on a Sichuan ilmenite ore sample are made. The tests results indicated that the ilmenite concentrate recovery of arc bottom pinched sluice is higher 11.22% than that of common pinched sluice when ilmenite concentrate grade of them is similar, so the separation effect is improved markedly.

Key words: Common pinched sluice, Arc bottom pinched sluice, Ilmenite separation effect