RU2147467C1 - Method of resource-saving magnetic concentration of finely disseminated iron ores - Google Patents

Abstract

FIELD: magnetic concentration of iron ores. SUBSTANCE: method may be used in production of low-siliceous iron-ore concentrate. The method includes wet grinding of crushed iron ore and magnetic concentration of ground product in several stages. Magnetic products of the first stage of concentration of two neighboring sections of concentrating mill are combined. Obtained mixture is first finely ground and concentrated on equipment of next stages of the first section. Obtained combined magnetic product is finely ground and concentrated on equipment of next stages of the second section. EFFECT: provided production of high-grade concentrate with low content of iron in wastes and resource saving due to reduction of irrecoverable losses of mineral raw material in concentration. 1 dwg

Description

 The invention relates to the field of wet magnetic mineral processing, mainly finely disseminated iron ores (ferruginous quartzites, taconites, etc.).

 There are various methods of wet magnetic enrichment of finely disseminated iron ores, which include wet grinding of the initial crushed ore and magnetic enrichment of the crushed product in one or several stages to obtain the final concentrate by magnetic separation and waste (see "Guide to mineral processing" under the editorship of O. V. Bogdanova, vol. 1, 1971, M.).

 There is also a known method of beneficiation of finely disseminated iron ores, including the preparation of the final concentrate by magnetic separation and subsequent regrinding and enrichment with conventional magnetic separation, such as, for example, at the processing (plant) of Lebedinsky GOK OJSC, Russia (see Mining Journal No. 3, 1996 / Improving the enrichment technology / V.A. Klyushin, A.V. Ostapenko, pp. 27-29) - prototype of the invention.

 According to the prototype, each section of the refinery has a “completed” process flow diagram from grinding the initial ore to the release of the filtered magnetic separation concentrate. For the production of high-grade iron ore concentrate at the LebGOK OJSC, suitable for metallization, the final magnetic separation concentrate is refined and enriched with magnetic separation in a separate so-called finishing mill.

 The disadvantage of all known methods of wet magnetic enrichment of finely disseminated iron ores, including the prototype, is that in the final concentrate of magnetic separation there is a relatively high amount of silica from 5 to 8%, which makes it difficult to use it for the production of metallized briquettes and pellets used for off-grid metal production.

 The regrinding of the final magnetic separation concentrate and then its enrichment lead to an increase in operating costs and to high losses of metal in waste.

 The aim of the invention is to provide a method for wet enrichment of ferruginous quartzites, which provides a significant reduction in operating costs when obtaining low silica concentrate with a low iron content in production waste, that is, a new energy-saving enrichment technology.

 The goal is achieved in that the magnetic products of the first stage of enrichment of two adjacent sections of the OP are combined and then the resulting mixture is first refined and enriched in the equipment of the subsequent stages of the first section, then the magnetic product obtained here is refined and enriched in the equipment of the subsequent stages of the second section.

 Due to the implementation of the operations of the method on two sections of the OB combined in this way, an additional stage of grinding the intermediate product and an additional stage of its enrichment are created, which eliminates the need to introduce external grinding operations and additional enrichment of the final magnetic separation concentrate, as is the case in known methods, including the method prototype, the production of high-grade iron ore concentrate.

 The implementation of the method is illustrated in FIG. 1, from which it can be seen that on the existing (existing) equipment of two OB sections without increasing capital and operating costs, the developed method allows you to create an additional, fourth, stage of grinding and re-enrichment of the crushed product. This ensures a significant increase in the iron content in the concentrate and the production of a high-grade concentrate suitable for metallization.

 As can be seen from FIG. 1, the grinding of the initial crushed ore is carried out in two stages, so that in the feed of the first stage of magnetic enrichment of two adjacent sections of RP, 75-80% of the disclosed product is obtained. This ensures the discharge of up to 80% of the relative waste in the first stage of enrichment and the production of relatively rich intermediate products in an amount that allows their mixing and joint subsequent regrinding and enrichment.

 The method was tested in industrial conditions OF-1 OJSC "Poltava GOK" (Ukraine), which showed that it fully provides a solution to the problem when making significant profits.

Claims (1)

 A method of resource-saving magnetic enrichment of finely disseminated iron ores, including wet grinding of crushed iron ore and magnetic enrichment of the crushed product in several stages, characterized in that the magnetic products of the first stage of enrichment of two adjacent sections of the processing plant are combined and the resulting mixture is first crushed and enriched in the equipment of the subsequent stages of the first sections, and then the combined magnetic product obtained here is crushed and enriched in the equipment of subsequent tadiya second section.