High-efficiency and energy-saving new lean magnetite combined milling magnetic separation method

Abstract

The invention discloses a high-efficiency and energy-saving new lean magnetite combined milling magnetic separation method. A high pressure roller mill is used as an ultrafine crushing device, and a vertical mill substitutes a ball mill. The method comprises the following steps: crushing, screening, carrying out dry pre-concentration, milling through the high pressure roller mill, carrying out medium field intensity wet magnetic separation, carrying out vertical coarse milling, carrying out weak magnetic roughing, carrying out vertical fine milling, and carrying out low intensity magnetic separation. The method allows a large number of coarse grain waste ores to be abandoned before milling, so the milling amount is reduced, the over milling problem during mineral liberation is effectively solved, and the consumption of steel balls and lining plates of the ball mill is significantly reduced, thereby the operation cost of the whole process is reduced. The method improves the grade of raw ores by above 2% after the weak magnetic dry separation, improves the relative grindability of roller mill products by above 30%, and reduces the energy consumption by 35-50% by adopting the vertical stirred mill to substitute the ball mill; and the power consumption of per unit of the raw ores and the consumption of the steel balls and the lining plates of the method in the invention are 65.37% and 59.26% lower than those of with routine three stage closed loop + two stage ball milling + two stage weak magnetic separation milling technologies in ore separation work respectively.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a mineral processing process for magnetite ore, which is particularly suitable for high-efficiency and energy-saving separation of low- and medium-grade (iron grade ≤ 33%) magnetite ore. Background technique [0002] At present, my country has entered an energy-saving society, and energy costs are getting higher and higher, and mining is an industry that consumes a lot of energy in my country. This requires mining companies to start from the subtleties to find out the energy-saving and reducing energy consumption according to their own different conditions and ore characteristics. On the premise of ensuring the technical indicators of mineral processing, comprehensively research and adopt corresponding energy-saving technologies, equipment and processes to reduce costs and increase efficiency. [0003] Magnetite is an important iron ore resource in my countr...

AI Technical Summary

Problems solved by technology

But in general, the above-mentioned process does not fully combine the characteristics of ore and equipment, and only partially saves energy. The energy consumption of the entire process is still high, the consumption of steel balls and liners is large, and the comprehensive cost of mineral processing is high, which affects the comprehensive efficiency.

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