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Mineral processing method for comprehensively recovering weak magnetic iron, rare earth and fluorite

A mineral processing method and weak magnetic technology, applied in chemical instruments and methods, mechanical material recovery, recycling technology, etc., can solve problems such as waste of useful resources, environmental pollution, and ineffective use of fluorspar

Inactive Publication Date: 2017-10-24
INNER MONGOLIA UNIV OF SCI & TECH
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Problems solved by technology

At present, due to multiple factors in the technical economy and the mining market, most small concentrators only select strong magnetic magnetite and rare earth minerals that are easy to recover by flotation from raw ore. Most of the weak magnetic iron minerals, rare earths and fluorspar will be Lost in the tailings, the total iron TFe grade in the tailings is about 20%, the rare earth REO grade is 4~5% and the fluorite CaF 2 The grade is about 22%, which not only causes a waste of useful resources, but also easily dissociates and releases a large amount of metal ions under the long-term immersion of metal minerals in the tailings pond, causing environmental pollution
At present, weak magnetic iron ore beneficiation technology is mainly applied in single iron ore beneficiation. Rare earth flotation is also mainly aimed at rare earth ores with high grade (about REO8%). There are few studies on beneficiation of low-grade rare earth ores. The fluorite in the mine has not been effectively utilized for many years. Therefore, the development of weak magnetic iron, rare earth and fluorite mineral processing methods is of great significance to the comprehensive utilization of tailings

Method used

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  • Mineral processing method for comprehensively recovering weak magnetic iron, rare earth and fluorite

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Embodiment

[0014] A certain magnetite and rare earth beneficiation tailings in Baiyun Obo area, Inner Mongolia, the grade of TFe in the tailings is 21.6%, the grade of REO is 4.85% and the grade of CaF 2 Grade 22.5%. The tailings are subjected to strong magnetic separation with a high-gradient magnetic separator at a magnetic field strength of 0.7T, and the iron concentrate is ground to -45 μm by a ball mill, accounting for 82%, and after drying, it is mixed with activated carbon at a weight ratio of 0.18:1 , magnetized roasting at a roasting temperature of 720°C for 80 minutes, and the magnetized roasted product was ground with a rod mill for 2 minutes to dissociate and disperse. Under the condition of a 1250Gs magnetic field, a drum-type magnetic separator was used for weak magnetic separation to obtain TFe grade 56 % of the weak magnetic separation concentrate, the weak magnetic separation concentrate is selected by a magnetic separation column. The magnetic separation column selectio...

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Abstract

The invention discloses a mineral processing method for comprehensively recovering weak magnetic iron, rare earth and fluorite. The mineral processing method comprises the following steps: by taking tailings as a raw material, adopting high intensity magnetic separation by a high gradient magnetic separator, ore grinding, magnetic roasting, low intensity magnetic separation by a cylinder magnetic separator and selection by a magnetic separation column to obtain final iron concentrates with a TFe grade being 60-62 percent; adopting ore grinding on the tailings subjected to high intensity magnetic separation by taking o-hydroxy naphthalene hydroxamic acid as a collector and water glass as an inhibitor, and carrying out flotation with one rough floatation and three concentrating to obtain rare earth concentrates with an REO grade being 48-52 percent; and adopting ore grinding on rare earth flotation tailings by taking sodium oleate as a collector and acidified sodium silicate as an inhibitor, and carrying out flotation with one rough floatation and eight concentrating to obtain fluorite concentrates with a CaF2 grade being 92-94 percent. By adopting a technology provided by the invention, iron, rare earth and fluorite concentrates which can be directly sold can be obtained, comprehensive utilization of useful resources in the tailings is realized, and the mineral processing method has important economic value and environmental significance.

Description

technical field [0001] The invention relates to a beneficiation method for comprehensively recovering weak magnetic iron, rare earth and fluorite from magnetite and rare earth beneficiation tailings, and belongs to the technical field of comprehensive utilization of mineral resources. Background technique [0002] The Baiyun Obo Mine in Inner Mongolia is a complex polymetallic symbiotic ore of iron, rare earth, niobium and fluorite. The iron minerals in the raw ore are mainly strong magnetic magnetite and weak magnetic hematite, and the rare earth minerals are bastnaesite and monazite. At present, due to multiple factors in the technical economy and the mining market, most small concentrators only select strong magnetic magnetite and rare earth minerals that are easy to recover by flotation from raw ore. Most of the weak magnetic iron minerals, rare earths and fluorspar will be Lost in the tailings, the total iron TFe grade in the tailings is about 20%, the rare earth REO gr...

Claims

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Application Information

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IPC IPC(8): B03B9/06B02C21/00B03C1/00B03C1/02B03D1/00
CPCB02C21/00B03B9/06B03C1/002B03C1/02B03D1/00Y02W30/52
Inventor 曹钊曹永丹张金山
Owner INNER MONGOLIA UNIV OF SCI & TECH
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