Weak magnetic separation-roasting-regrinding magnetic separation tailings recovery process

Abstract

The invention relates to a technology for recycling tailings through the process of weak magnetism concentration, roasting and regrinding magnetic separation. The technology is characterized by comprising the steps of magnetic separation, a first-stage ore grinding, magnetic separation and weak magnetism concentration, wherein second-stage cylindrical magnetic separation concentration is selected, second-stage ore grinding is carried out, then the front four stages of weak magnetic separation technology is adopted for concentration extraction and tailing abandon, qualified coarse concentrate is obtained in advance, and thus the quality of ore entering the roasting operation is reduced; suspension roasting is adopted, it can be ensured that micro-fine particle hematite, siderite and limonite in the coarse concentrate materials are converted into magnetic iron materials at the temperature of 500-600 DEG C in a suspension magnetization roasting furnace; and meanwhile, multi-stage concentration is carried out through three stages of ore grinding and rear four stages of wheal magnetic separation, and thus the good indexes with the concentrate grade higher than 64% and the metal recycling rate higher than 55% are obtained.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to a tailing recovery process of weak magnetic concentration-roasting-regrinding magnetic separation. Background technique [0002] At present, 10% to 15% of the iron ore lost in the comprehensive tailings with a grinding particle size of -0.074mm is 60% to 70% produced by the concentrator using "stage grinding, coarse and fine separation, and heavy-magnetic-flotation combined process" The materials are mainly red limonite and magnetic iron. The current effective process for the recovery of comprehensive tailings is: use two-stage spiral chute for comprehensive tailings, permanent magnet sweeping, and mix spiral concentrate and permanent magnet concentrate to form coarse concentrate. , Coarse concentrate is ground and then selected by weak magnetic, strong magnetic, reverse flotation or centrifuge process. Adopt the "spiral chute, permanent magnet-grinding-strong mag...

AI Technical Summary

Problems solved by technology

Therefore, the problem of high grade tailings cannot be solved after the comprehensive tailings are sorted by "spiral chute, permanent magnet-grinding-strong magnetism, centrifuge process", which makes it difficult to further improve the recovery rate

"Magnetic separation-roasting-magnetic separation process" uses strong magnetic to separate the tailings, then roasts all the obtained strong magnetic concentrates, and then uses weak magnetic to separate the roasted ore. Although this process improves the recovery rate , but since the distribution rate of magnetic iron in the tailings is 15% to 40%, this part of the product should not be processed in a roasting process with complicated processes (concentration, filtration, drying, etc. before roasting), high energy consumption, and high cost deal with

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