Fine grinding process for micro fine grain ore

Abstract

The invention discloses a fine grinding process for micro fine grain ore. The fine grinding process comprises first-stage ore grinding, second-stage ore grinding and a third-stage ore grinding in sequence, wherein ball mills are adopted in the first-stage ore grinding, the second-stage ore grinding and the third-stage ore grinding for ore grinding, and swirlers are adopted for grading; the draw ratio of the ball mills adopted in the three stages of ore grinding is 2.5-3.0; a ore grinding medium adopted in the three stages of ore grinding is preferably a steel section, and the filling quantity of the steel section is 20%-40% of the volume of a barrel body of the ball mills. The process provided by the invention has the advantages of being low in investment cost, small in space area, simple and convenient to produce and maintain, efficient and low in consumption, easy to implement, produce and operate and the like.

Description

technical field [0001] The invention relates to an ore grinding process, in particular to an ore grinding process applicable to microfine ore. Background technique [0002] my country's iron ore resources are characterized by a lot of lean ore, a lot of fine-grained inlays, and complex types of ore, that is, poor, fine, and miscellaneous. With the rapid development of my country's iron and steel industry, rich iron ore and easy-to-select iron ore resources are becoming less and less, and the remaining iron ore is mainly poor, fine, miscellaneous and difficult-to-select iron ore, and the current development and utilization rate is low . In this context, it has become more and more important to fully develop the existing iron ore. In order to develop this part of ore resources, it is necessary to crush and finely grind the ore to fully realize the monomer dissociation of useful minerals. Among them, the grinding process is a key step to realize the dissociation of useful min...

AI Technical Summary

Problems solved by technology

[0003] In the field of ore grinding, the ball mill is still the main choice for the first and second stages of grinding, but as a third stage grinding equipment, when it is applied to the situation where the ore needs to be finely ground to achieve sufficient monomer dissociation of useful minerals, it mainly shows the following Disadvantages: 1) It is difficult to realize the dissociation of fine-grained minerals; 2) When some minerals have been dissociated, it is easy to muddy, resulting in the loss of useful minerals; 3) High energy consumption

[0006] If the existing conventional ball milling scheme is adopted, problems such as inappropriate aspect ratio of the ball mill, unreasonable grinding media, and inappropriate grading equipment will often occur, resulting in that the minerals cannot be dissociated from the monomers, and the beneficiation indicators (such as grade, recovery rate) is not ideal

In short, the existing conventional ball milling technology cannot effectively solve the problem of fine grinding for iron ore resources with fine particle size and fine grinding to realize the dissociation of useful mineral monomers.

At present, in industrial production at home and abroad, there is no production practice that ball mills can be used for fine grinding to reach -0.025mm, accounting for more than 85%.

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