Coarsness grading process for mineral separation and grinding

Abstract

The invention relates to a coarsness grading process for mineral separation and grinding. The coarsness grading process for the mineral separation and grinding is characterized by comprising the following steps of: 1) preparing a ball grinding machine with a quality classifying screen, namely mounting the quality classifying screen at a mineral discharging outlet of the ball grinding machine, and fixing the quality classifying screen on an end cover at the mineral discharging outlet of the ball grinding machine, wherein the screening aperture of the quality classifying screen is 2mm, and during working, the quality classifying screen rotates together with the ball grinding machine; and 2) feeding and grinding minerals in the ball grinding machine with the quality classifying screen, wherein the minerals flowing out of a grid plate of the ball grinding machine enter a screen body of the quality classifying screen from the mineral discharging outlet of the ball grinding machine, the finely granulated minerals with the granularity of less than or equal to 2 mm are screened out of the screen body of the quality classifying screen under the pushing action of centrifugal force and external spiral, are flushed into an original pump by pressure water and are conveyed by the pump into a hydrocyclone for fine grading; and the roughly granulated minerals with the granularity of more than 2 mm flow into a settling pit and are directly put into a mineral grinding machine through a sand pump to form a closed loop for finishing quality classifying. By the process, a grading effect of the hydrocyclone can be enhanced and power is saved.

Description

technical field [0001] The invention relates to a coarse-grained classification process in ore dressing and grinding, and belongs to the technical field of ore dressing, grinding and classifying processes. Background technique [0002] In recent years, the cost price competition in the metallurgical industry has become increasingly fierce. In order to further reduce the cost of beneficiation, in the case of using cylinder screens in metal beneficiation plants, the classification system of the first stage of grinding has been modified. Practice has proved that it is technically feasible to use the self-returning cylinder screen for one-stage grinding and classification, and the operation and maintenance costs are economical. [0003] We believe that the materials after different grinding and grading processes are composed of different particle sizes, and this different particle size composition has a significant impact on the classification effect of the first-stage cyclone. ...

AI Technical Summary

Problems solved by technology

The returned sand of the first section of the cyclone not only occupies the volume of the ball mill, affects the performance of the ball mill, but also causes over-grinding to affect the metal recovery rate

Images