Recent experimental research into the motion of solid particles in a hydrocyclone has shown that some particles in the inner helical flow move towards the hydrocyclone wall in the cylindrical section. Enlightened by this result, a new hydrocyclone has been developed with a central cone. In addition, because some coarse particles discharge directly with the overflow as a result of the short-circuit flow, the new hydrocyclone has also been designed with a vortex finder attachment. Separation experiments were carried out with the new hydrocyclone, comparing it with the conventional one. The experimental results showed that the sharpness of separation for the new hydrocyclone, with a central cone and vortex finder attachment, was higher than that for the conventional hydrocyclone. The optimum geometric parameters and position of the central cone were also determined experimentally.