Ways of efficiency increasing of iron ore raw materials concentration technology

Abstract

Iron ore raw materials quality to a great extent determines technical and economic indices of metallurgical production. A brief characteristic of main types of iron ores of Russia quoted. It was shown, that they require concentration for utilization them in metallurgical production. Concentration flow charts of main types of iron ores considered. Main ways of iron ore raw materials concentration flow charts perfection directed on concentrates quality increase, concentration specific costs decrease and increase of raw materials utilization complexity. At Lebedinsky mining and concentration complex (MCC) at the expense of additional milling and concentration of high quality concentrate, a super-concentrate is produced having the iron mass content no less than 69.5% and silica content no more than 3.5%. The increase of iron mass content is 1.5–2%. At Mikhajlovsky MCC additional concentration of regular concentrate with iron mass content 65.5–66% enables to produce a super-concentrate having the iron mass content no less than 69% and silica mass content no more than 3%. The increase of iron mass content is 3–3.5%. Fine hydraulic screening is used at Kostomuksha and Kovdor MCCs for adjusting of regular concentrates. The undersize of sizing screens is a high quality concentrate, and oversize fraction is an intermediate product subjected to additional milling and concentration. When using the fine hydraulic screening, the super-concentrates are not obtained. Indices of super-concentrates production with application of separation in an alternative magnetic field quoted. Low complexity of iron ore raw materials utilization is typical at concentration of hematitemagnetite quartzite ores. In Russia the hematite-magnetite quartzite ores are mined and concentrated at three MCCs as follows: Olenegorsky, Mikhajlovsky and Kimkano-Sutarsky. Flow-charts and indices of magneto-gravitation concentration quoted, applied for hematite concentrate production. Stage separation of not only tails but also of concentrates is one of methods of expenses decreasing. A diagram of concentrate stage separation with application of concentration method or fine screening considered. Results of industrial application of flow-charts with concentrate stage separation quoted, the application taken place at Kachkanar MCC with application of two methods – wet magnetic concentration and fine hydraulic screening.

Increasing the recovery ratio of iron ores in the course of preparation and processing

“…Methods of processing for one or another kind of raw material depend primarily on the difference in physical (or physico-chemical) properties of the particles to be separated. The major technique of ferruginous quartzites beneficiation is low intensity magnetic separation (LIMS) [1][2][3][4][5]. The advantages of magnetic methods are minimal environmental footprint, high rate of productivity and relatively low production costs [5].…”

“…Another substantial additional source of iron could be various secondary materials. The most common methods used in concentration of OFQ are magnetic-flotation, magnetic-gravity flotation, gravity separation, magnetic roasting, and other technological processes [3][4][5][6][7][8][9]. The challenge of essentially different stages within the beneficiation process complicates the product recovery and promotes the growth of ore pro-cessing costs.…”

“…However, the presence of magnetite grains and clots in the operating area of a high grade separator is unacceptable since the matrices of the separator working elements get clogged with magnetite. Consequently, there is a need for two or more stages of separation in order to separately produce magnetite and hematite concentrates [4][5][6][7][8][9].…”