Fine grinding process for micro fine grain ore

A fine-grained and fine-grinding technology, which is applied in solid separation, wet separation, grain processing, etc., can solve problems such as the difficulty of dissociation of fine-grained minerals, loss of useful minerals, unreasonable grinding media, etc., and achieves a good prospect for industrial promotion , production and maintenance is simple, the effect of small footprint

Active Publication Date: 2012-11-14
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Claims
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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

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  • Fine grinding process for micro fine grain ore
  • Fine grinding process for micro fine grain ore

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Embodiment

[0027] a kind of like figure 1 Shown the present invention is used for the fine grinding process of micro-grained iron ore, comprises the following steps:

[0028] (1) One-stage grinding: Firstly, a fine-grained iron ore after crushing (assuming a production scale of 2.3 million t / a, the fine-grained iron ore is mainly composed of magnetite, hematite and a small amount of false hematite, And it is mainly magnetite, the raw ore grade is about 28%, and the embedded particle size is mostly between 2μm and 30μm). Φ500×6) + one-stage overflow ball mill (Φ4.5×9m)” for a closed-circuit grinding system to conduct one-stage grinding. The specific steps are to send the crushed iron ore products into a stage overflow ball mill (steel The amount of added balls is 42%.) Grinding is carried out once, the discharge after the first grinding is fed into the first stage of cyclone group for a stage of classification, and the underflow after a stage of classification is returned to the first s...

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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...

Claims

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Application Information

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IPC IPC(8): B03B7/00B02C21/00
Inventor 吴革雄王海波肖业俭陈滨欧阳魁陈有垒
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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