Iron-increasing and silicon-reducing reselection technique for mixed-type lean iron ore tailings

Abstract

The invention discloses an iron-increasing and silicon-reducing reselection technique for mixed-type lean iron ore tailings, comprising the following steps of: strong magnetic roughing: putting mixed-type lean iron ore tailings through a strong magnetic separator with the magnetic field intensity of 5000-10000 Oersteds to obtain roughed concentrate and roughed tailings; strong magnetic cleaning: selecting the roughed concentrate in the strong magnetic separator with the magnetic field intensity of 10000-20000 Oersteds to obtain magnetic concentrate and magnetic tailings; centrifugal selecting: putting the magnetic concentrate in a centrifugal concentrating machine with the rotating speed of 150-250r / min to obtain centrifugal concentrate and centrifugal tailings; and table selecting: selecting the centrifugal tailings through a table with the stroke of 8-10mm and the frequency of stroke of 250-300 times / min to obtain table concentrate and table tailings. According to the iron-increasing and silicon-reducing reselection technique, a great quantity of tailings is dropped through rough and concentrate double magnetic selection; the magnetic concentrate is selected by using the centrifugal machine so that irons are increased and silicon is reduced; and then the centrifugal tailings are selected by using the table so that the productivity is increased. The iron-increasing and silicon-reducing reselection technique has the effects of realizing iron increment and silicon reduction of the mixed-type lean iron ore tailings, incrasing the productivity of the iron ore to a great extent at the same time and providing an effective approach to iron increment and silicon reduction of the reselected concentrate for the mixed-type lean iron ore tailings.

Description

technical field [0001] The invention belongs to the technical field of ferrous metal beneficiation, and in particular relates to a mixed fine-grain embedded magnetite ore beneficiation process, in particular to a mixed lean iron ore tailings re-election process for increasing iron and reducing silicon. Background technique [0002] Steel is an important pillar industry for social development and the most important and most widely used metal material in modern industry. In 2011, my country's crude steel output reached 683 million tons, and it has become the country with the largest steel production in the world for 16 consecutive years. my country's iron ore dependence on foreign countries also increased from 14.15% in 1990 to 63% in 2010, but it basically has no say in the pricing of international iron ore. Therefore, improving the output and quality of finished ore in self-owned mines is a key link in improving the market competitiveness and sustainable development capabil...

AI Technical Summary

Problems solved by technology

In order to improve the utilization rate of resources, most ore concentrators adopt a strong magnetic-two-end spiral chute process or a coarse-finish two-end spiral chute process for re-selection of tailings. For weak magnetic tailings, especially mixed lean iron ore tailings The grade of re-selected concentrate is 50-62%, and the silicon content is mostly around 6%. The cost of mineral processing is high, and the yield of fine particles is generally only about 5%, which seriously affects the quality of finished concentrate and resource utilization.

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