Beneficiation process for treating high-sulfur hematite-magnetic iron ore mixture

Abstract

The invention relates to a beneficiation process for treating high-sulfur hematite-magnetic iron ore mixture. In the beneficiation process, treatment of raw ores with an iron grade being 25 -27 percent and a sulfur grade being 0.4-0.percent comprises the following step of obtaining a 58-62 percent primary overflow product with the overflow particle size being -0.074mm. The beneficiation process ischaracterized in that secondary closed circuit grinding is performed on the overflow product to obtain a product with the particle size being -0.3mm, coarse and fine particle classification is performed on the product with the particle size being -0.3mm with a high frequency fine screen II to obtain a coarse product with the particle size being 0.3-0.074mm and a fine product with the particle size being -0.074mm, beneficiation is performed on the coarse product with operation of low-intermediate intensity magnetic separation, gravity separation, low intensity magnetic separation, middling closed circuit regrinding and reverse flotation, beneficiation is performed on the fine product with operation of low-high intensity magnetic separation, middling closed circuit regrinding and reverse flotation, and iron concentrates with an iron grade being 66 percent or above and a sulfur grade being 0.1 percent or below are obtained. The beneficiation process has the advantages that technical indexes are qualified, and the economic benefit is remarkable.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a beneficiation process for processing high-sulfur red-magnetic mixed iron ore. Background technique [0002] The salient features of my country's iron ore resources are poor, fine, and miscellaneous, that is, there are many low-grade lean ores, the ore composition is complex, the distribution of useful minerals is fine, and most of the refractory iron ores are. At present, domestic concentrators mostly adopt "stage grinding, coarse and fine separation-gravity, magnetic and floating combined process" to process mixed iron ore mainly composed of lean magnetite. "Single magnetic separation process" or "magnetic-flotation joint process" is mostly adopted. [0003] The reserves of iron ore resources in Hebei are in the forefront of the national reserves. Most of the iron ores in this area belong to the "Anshan type" sedimentary metamorphic iron deposits. The o...

AI Technical Summary

Problems solved by technology

At present, the ore processed by most concentrators of HBIS Group is shallow hematite ore. Taking the Sijiaying Iron Mine of Hebei Iron and Steel as an example, surface hematite ore has been mined for more than ten years. With the increase of raw ore mining depth, the ore type gradually In the transition to deep magnetite, the embedded particle size becomes finer, and at the same time, the content of pyrite in the ore increases. The existing beneficiation process for processing hematite that has been produced for more than 10 years can no longer adapt to the change of ore properties, and the pyrite is mixed in In the concentrate, the sulfur grade in the concentrate is higher than 0.2%, which does not meet the market requirement that the sulfur grade in the iron concentrate is less than 0.1%

The price of concentrate is reduced, which seriously affects the economic benefits of the enterprise

[0004] According to the research on the nature of the ore and the understanding of the current status of some beneficiation production, in the existing process of processing hematite, the iron grade of the gravity separation concentrate is low, the gravity concentration concentrate has high sulfur content, serious overgrinding during production, and iron loss In tailings, the simultaneous coarse and fine classification process using cyclones is inefficient

In the sorting process, the ore regrinding and returning to the coarse and fine grading cyclone process is unreasonable, resulting in a large cycle compliance, which seriously affects the gravity selection index, and a vicious cycle. With the increase of high-sulfur mixed ore, the process cannot be desulfurized, resulting in the concentration of sulfur in the concentrate. Big

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