Mineral processing process for processing mixed ore of magnetic iron ore and hematite-limonite ore

Abstract

The invention relates to a mineral processing process for processing mixed ore of magnetic iron ore and hematite-limonite ore. The mineral processing process comprises steps as follows: raw ore containing the mixed ore of the magnetic iron ore and the hematite-limonite ore is smashed and then subjected to two-stage continuous ore grinding; overflowing ore of a secondary classifying cyclone is subjected to two-stage low-intensity magnetic separation and one-stage fine screening and separation in combination of a single magnetic separation, fine screening and regrinding process for processing magnetic ore; under the condition of rougher ground ore particles, a part of undersize qualified magnetite concentrate products are firstly obtained, the other part of oversize products are combined with one-stage high-intensity magnetic separator concentrate and two-stage low-intensity magnetic separator tailings to serve as middlings, and the middlings are subjected to three-stage ore grinding classification operation for regrinding and separation; and overflowing ore of a tertiary classifying cyclone is subjected to three-stage low-intensity magnetic separation and high-intensity magnetic separation, fine-grain qualified tailings are thrown again, three-stage low-intensity magnetic concentrate and two-stage high-intensity magnetic concentrate are combined to obtain mixed magnetic concentrate, the mixed magnetic concentrate is subjected to a reverse flotation process for separation, and a qualified flotation concentrate product is obtained. According to the mineral processing process, the mixed ore of the magnetic iron ore and the hematite-limonite ore with different dissemination particle sizes is reasonably processed, the qualified iron ore concentrate product is obtained, and the mineral processing process is economical, energy-saving and environment-friendly.

Description

[0001] technical field [0002] The invention belongs to the technical field of iron ore separation, in particular to a mineral separation process for processing magnetic and red mixed ore. Background technique : [0003] Due to the rising price of imported ore, how to make reasonable use of our country's existing ore resources is of great practical and great significance to my country's iron and steel industry. [0004] There is a mixed ore mainly containing magnetite and red limonite, the raw ore grade is low, only 30.02%, of which red limonite content is more, accounting for 50.89% of the total iron content, followed by strong magnetic magnetite , accounting for 32.28% of the total iron content, there are also weak magnetic false appearance and semi-alpha hematite accounting for 11.03% of the total iron content, containing a small amount of iron carbonate and iron silicate, less harmful impurities of S and P, and gangue minerals Mainly quartz. The processing of such...

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Problems solved by technology

If the magnetic ore part of the mixed ore is processed by a single magnetic separation, fine sieve and regrinding process, a part of qualified concentrate products can be obtained under the sieve, and the products on the sieve must be regrinded and re-selected, but the magnetic ore in the mixed ore The iron ore part needs to be ground and re-selected after fine sieve upgrading, and the yield on the sieve is only 12%; at the same time, the hematite part in the weak magnetic tailings after the mixed ore has been separated by weak magnetic separation also needs further processing. Only by fine grinding can it achieve the dissociation of iron minerals; in addition, if this part of hematite is treated by weak magnetic-strong magnetic-reverse flotation process alone, the reverse flotation feed grade is as low as 34 %, the ore grade of the reverse flotation process for processing magnetic and red mixed ores is above 42%

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