Method for recovering non-uniformly embedded high-silicon specularite and hematite

By combining gravity separation, roasting, magnetic separation, and reverse flotation, the problem of low recovery rate of unevenly disseminated high-silica specular hematite and hematite has been solved, achieving efficient iron recovery and low-cost iron concentrate production. It is highly adaptable and suitable for ores with complex disseminated particle sizes.

CN120920184APending Publication Date: 2025-11-11NORTHWEST RES INST OF MINING & METALLURGY INST
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Patent Information

Application Number
CN202511351292.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-22
Publication Date
2025-11-11

AI Technical Summary

Technical Problem

The unevenly distributed high-silica specular hematite and hematite have problems such as low iron recovery rate and substandard concentrate quality during the recovery process. In particular, the complex intergrowth relationship between iron minerals and silica-bearing gangue minerals leads to losses in the tailings during gravity separation. During magnetic separation, silica-bearing gangue and pyrite enter the concentrate, and direct roasting is costly and economically inefficient.

Method used

A combined gravity separation-roasting-magnetic separation-reverse flotation process is adopted. Four types of ore are separated by dry vibrating screen. Large particles are processed separately by grinding, coarse/medium particles are separated by shaking table, fine particles are directly roasted, middlings are combined and then reduced roasted and magnetically separated, and finally reverse flotation is used for desiliconization. The process parameters are optimized to improve iron recovery rate and reduce cost.

Benefits of technology

It achieves efficient recovery of iron concentrate, with iron recovery rate increased to 87.56%-90.12%, concentrate grade stabilized at 64.21%-68.78%, and silicon content controlled at 6.5%-7.54%. It reduces energy consumption and processing costs, has strong adaptability, and is suitable for ores with complex intergrowth particle sizes.

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Abstract

The invention discloses a method for recovering non-uniformly embedded high-silicon specularite and hematite. The method comprises the following steps: classifying ores into large grains (+ 2-3mm), coarse grains (+ 0.5-2mm), medium grains (+ 0.074-0.5 mm) and fine grains (-0.074 mm) through dry vibrating screening; grinding large grains, combining with coarse grains, sorting by a coarse sand shaking table, and sorting medium grains by a fine sand shaking table to obtain primary concentrate and middlings; the middlings and the fine particles are subjected to reduction roasting to be converted into magnetite under the conditions that the adding amount of the carbon powder is 15-20% and the temperature is 1000-1250 DEG C, and secondary concentrate is recovered through 1600-1900Oe magnetic separation after ore grinding; and combining double concentrates, and carrying out reverse flotation desilicication to obtain a final product. The method solves the problems of uneven dissemination and high silicon restriction of the hematite, the iron recovery rate reaches 87.5-90.1%, the concentrate grade is 64.2-68.8%, the silicon dioxide content is reduced to 7.3-9.5%, the cost of per ton of ore is remarkably reduced, and the method is suitable for resource utilization of the sedimentary metamorphic refractory iron ore.
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