Horizontal grinding mill with built-in classifying turbine

Abstract

The invention relates to a horizontal grinding mill with built-in classifying turbine, the technical solution of which is that a grinding chamber [18] is filled with grinding medium [6], a medium discharging valve [20] is installed on the middle of the bottom of a cylinder [7], a feeding pipe [10] is above a right end cover [9] of the grinding chamber [18] and a medium discharging pipe [2] is concentrically communicated with the grinding chamber [18] by a left end cover [3]. The length of the cylinder [7] is 1.5 to 2.5 times of the diameter thereof. A fairing [4] is fixedly installed on the left end cover [3] of the grinding chamber [18]. A classifying turbine [5] is vertically installed on the left end of a spindle [13]. A clearance between the classifying turbine [5] and the left end cover [3] is 5mm to 10mm. Five to eight mixing turbines [8] are vertically installed on the spindle [13]. The distance between the mixing turbines [8] decreases gradually from left to right and the right distance is 0.9 to 0.95 times of the left distance. The right end of the spindle [13] is connected with a driving mechanism by the right end cover [9] and a sealing device [11]. The invention has low starting power and can grind and classify with a function of selectively grinding.

Description

technical field [0001] The invention belongs to the technical field of ore grinding equipment. It specifically relates to a horizontal grinding machine with built-in classifying impellers. Background technique [0002] Monomer dissociation is the prerequisite for the separation of useful minerals and gangue minerals. The dissociation of mineral monomers is achieved by the impact and grinding of grinding media by the grinding machine. It is a process of particle size reduction. The mineral separation process includes flotation, magnetic separation, gravity separation, electric separation and other methods. There are two kinds of particle size requirements for the ore entering the separation operation. One is that the degree of dissociation is qualified, which requires that the material entering the separation is smaller than a certain particle size; The second is to try to avoid the generation of ultrafine particles smaller than the lower limit of separation. Although the de...

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Problems solved by technology

[0003] The medium of the traditional ball mill has the same probability of impact and collision as the coarse and fine ore particles. Therefore, not only the coarse ore particles are crushed, but also the fine ore particles are crushed, regardless of whether the particle size of the fine particles has reached the degree of dissociation. The commonly used solution is to form a closed circuit between the ball mill and the grading equipment to shorten the residence time of ore particles in the mill. After grading, the qualified particles leave the grinding operation, and the unqualified coarse particles are still returned to the mill. This process alleviates the phenomenon of over-grinding to some extent, but the mechanism of medium-probability crushing of coarse and fine particles in the mill has not changed fundamentally, and the phenomenon of over-grinding has not changed fundamentally.

Compared with the ball mill, the grinding mechanism of the vertical stirring mill has changed. Due to the difference in the final sinking speed, the ore particle size at the bottom of the grinding chamber is coarser, and the grinding force in this area is also increased. To some extent, different grinding forces are realized. Grinding and stripping the coarse and fine particles, the phenomenon of over-crushing is alleviated. Its ore discharge is free ore discharge, especially the peripheral discharge. Coarse particles are discharged from the mill by the action of centrifugal force. limit its size

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