High-pressure roller selective comminuting and magnetic separating method for lean magnetite ore

Abstract

The invention relates to a high-pressure roller selective comminuting and magnetic separating method for lean magnetite ore. According to the method, ultrafine crushing is conducted on raw magnetite with a grade of 28.59% by means of a high-pressure grinding roller, and three times of ore grinding, two-section dewatering and three-section magnetic separation are conducted on the crushed product to obtain concentrate with a grade of 68.23% and metal recovery rate of 82.35%. The method has the advantages that the recovery rate of the final concentrate can be increased, and efficient recovery and utilization of resources are achieved; the dissociation degree of the product is high, excessive grinding degree is low, follow-up magnetic separation effect is good, and the separation precision of equipment is improved; on the premise that the quality of the concentrate is guaranteed, concentrate recovery rate can be increased, iron ore resources can be recovered and utilized fully and reasonably, and resource waste is reduced.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to a high-pressure roller selective crushing and magnetic separation separation method of lean magnetite. Background technique [0002] Magnetite ore has a high percentage of iron, less harmful elements, and less pollution during smelting. It is an important type of iron ore and occupies an extremely important position in my country's national economy and social development. The main characteristics of my country's iron ore resources are "poor, fine, and miscellaneous", with low average grades, complex and difficult-to-select iron ore resources account for a large proportion, and the reserves of fine-grained magnetite ore are huge, of which Anshan-style lean magnetite ore belongs to Iron-poor ores with high silicon and low sulfur and phosphorus content are low in hematite and limonite, and some ores have relatively high content of iron silicate and iron phosphate, and ...

AI Technical Summary

Problems solved by technology

High-pressure roller mills have achieved initial results in reducing energy consumption and coarse-grained tailings, but in the entire beneficiation process, the potential of high-pressure roller mills in reducing energy consumption has not been fully tapped, and only remain in the crushing of equipment Energy saving and consumption reduction; the grade of tailings with coarse-grained tailings is higher than the grade of final tailings, indicating that the tailings with coarse-grained tailings also contains useful minerals that can be recovered. Secondary selection will waste huge human and financial resources

At the same time, due to the lack of guiding role in setting requirements for technical parameters of other sorting equipment in the entire mineral processing process, especially in the mineral processing process of Anshan-style lean magnetite

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