A New Technology of Sorting Fine-grained Lean Magnetite Using Centrifuge

Abstract

The invention relates to the technical field of beneficiation of fine-grained lean magnetite, in particular to a new fine-grained lean magnetite beneficiation process using a centrifuge. It is characterized in that it includes the following steps: sending the raw ore into a closed-circuit grinding system composed of one-stage grinding and one-stage classification, the first-stage classification overflow enters one-stage magnetic separation, the one-stage magnetic separation concentrate enters secondary classification, and the tailings of one-stage magnetic separation are thrown away. At the end, the overflow of the secondary classification enters the dehydration tank, the bottom flow of the secondary classification returns to the secondary classification after the secondary grinding, the discharge of the dehydration tank enters the second-stage magnetic separation, and the concentrate of the second-stage magnetic separation enters the roughing centrifuge machine, the tailings of the second-stage magnetic separation are discarded, the concentrate of the roughing centrifuge enters the concentrating centrifuge, the tailings of the roughing centrifuge are discarded, the concentrate of the concentrating centrifuge is the final concentrate, and the concentrating centrifuge The tailings of the machine return to the second-stage magnetic separation. The invention uses a centrifuge instead of a fine sieve to process magnetically separated concentrates, effectively overcomes the problem of magnetic inclusions, and increases the grade of concentrates to 65%-70%.

Description

technical field [0001] The invention relates to the technical field of beneficiation of fine-grained lean magnetite, in particular to a new fine-grained lean magnetite beneficiation process using a centrifuge. Background technique [0002] At present, the process of "stage grinding, single magnetic separation-fine screen regrinding" and "stage grinding, magnetic separation-reverse flotation" are commonly used to process fine-grained magnetite-poor ore. Grade is a relatively direct and effective technical measure, but its disadvantages of complex pharmaceutical system and process flow, high investment and operating costs are real; a single magnetic separation process is adopted, the process structure is simple, the investment is low, and the construction period is short. Low cost, in recent years, has become the preferred process for processing fine-grained lean magnetite ore. [0003] Driven by the rapid development of the iron and steel industry and the increasing demand f...

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Problems solved by technology

[0002] At present, the process of "stage grinding, single magnetic separation-fine screen regrinding" and "stage grinding, magnetic separation-reverse flotation" are generally used to process fine-grained lean magnetite ore. Grade is a relatively direct and effective technical measure, but its pharmaceutical system, complex process, and high investment and operating costs do exist; a single magnetic separation process is adopted, the process structure is simple, the investment is low, and the construction period is short. Low cost, in recent years, it has become the preferred process for processing fine-grained lean magnetite ore

[0003] Driven by the rapid development of the iron and steel industry and the increasing demand for iron ore concentrates, the speed of development and utilization of iron ore resources has been accelerated. At present, some fine-grained magnetite-poor ores newly mined have extremely fine particle size, and the average iron ore The particle size of embedded cloth is less than 0.015mm. After the magnetic separation process is used to sort, the magnetic inclusions are serious. Although there is a certain grade difference between each particle size, but because the grade of the magnetic essence of each particle size is low, it is impossible to use a fine sieve. Obtain concentrates with a grade higher than 60%

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