Tailing treatment process of elutriation magnetic separator

Abstract

The invention discloses a tailing treatment process of an elutriation magnetic separator. The tailing treatment process comprises the following steps that tailings with the iron grade of 25%-35% of the elutriation magnetic separator are fed into a double-cylinder concentrated magnetic separator with magnetic field intensity larger than 3000 Oe to be subjected to two-stage continuous concentrationmagnetic separation, tailings of the double-cylinder concentrated magnetic separator are returned to front-sequence magnetic separation processes to serve as circulating water, concentrates of the double-cylinder concentrated magnetic separator are fed into a vertical mill to be subjected to open-circuit grinding, discharged ore of the vertical mill is fed into a magnetic scavenging machine with magnetic field intensity larger than 2000 Oe, concentrates with the iron grade of 40%-45% of the magnetic scavenging machine are returned to the elutriation magnetic separator to form a closed loop, and tailings with the iron grade of 15%-20% of the magnetic scavenging machine are fed into a tailing concentration tank. The tailing treatment process has the advantages that the iron recovery rate isincreased by 1%-2% compared with the rate of a traditional technology, the grade of the tailings is reduced from about 30% to below 20%, the utilization rate of iron resources is increased, quality and efficiency of a beneficiation plant are improved, energy is saved, and consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation technology, and in particular relates to a tailing treatment process of an elutriation magnetic separator for producing high-grade iron ore concentrate. Background technique [0002] At present, the magnetite beneficiation process in my country mostly adopts weak magnetic separator for ore dressing. Due to the limitation of weak magnetic separator equipment itself, most ore dressing plants produce conventional concentrate powder with iron grade lower than 66%. According to research, improving the grade of iron concentrate can significantly save energy, reduce consumption, and reduce costs in subsequent sintering and ironmaking processes. Therefore, the state has also begun to encourage and promote the work of improving the quality and reducing impurities of iron concentrate in various concentrators. In this context, elutriation magnetic separators represented by magnetic agglomerati...

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Problems solved by technology

It has been found in actual production that although the concentrate grade of the elutriation magnetic separator can increase the iron concentrate with a grade of 66% to the requirement of a high-quality concentrate with a grade of 68%~69%, it is necessary to use a large amount of iron concentrate in the production of this type of equipment. The water used as the rising power will discharge the poor contiguous organisms from the upper overflow port, so there are also the following disadvantages: one is that the discharged tailings are of high grade and difficult to control; the other is that the discharged tailings have a very low concentration, about 2%. About 80% of fine-grained conjoint organisms of -200 mesh, and it is difficult to recycle

In actual production, some ore concentrators treat this part of high-grade tailings as middle ore, and return to the original process for concentration magnetic separation-closed-circuit grinding-magnetic separation, and then the magnetic separation coarse concentrate is sent to elutriation magnetic separation machine to realize closed-circuit circulation; some concentrators also transfer this part of high-grade tailings directly into the general tailings, resulting in the loss of iron resources and waste of water resources

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