This invention is applicable for the cyanide leaching and agitation, and also applicable for the agitation of the fine minerals and reagents. Special doubleimpeller is designed for agitation and leaching. It is characterized by low power, high efficiency, uniform agitation and reliable operation. The equipment consists of the agitator, tank, aeration tube and support. It works on the following principles: The motor drives the two special agitators through the reduction gears and main driving shaft, the slurry is fed through the tipping tube in the middle of the shell and flow out from the top overflow pipe. And aeration is done around the tank walls to ensure full reaction between the reagent and slurry.