Method for comprehensively recycling valuable minerals in rare-earth tailings
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A technology of rare earth tailings and tailings, which is applied in the fields of niobium, fluorite, comprehensive recovery of rare earths and iron, can solve the problems of low recovery rate of valuable elements, low resource utilization rate, complex composition, etc. Simultaneous optimization of selectivity and good economic benefits
Inactive Publication Date: 2013-11-20
UNIV OF SCI & TECH BEIJING
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[0005] At present, some domestic scholars and research institutes have studied the recovery of rare earth, niobium, iron, fluorite, etc. in flotation rare earth tailings, and achieved certain results. Most of the existing literature and patent reports only focus on the One or two valuable components are recovered at the same time, and there is no report on the comprehensive recovery of the four valuable components. At the same time, due to the complex composition of Baiyan Obo rare earth tailings and the low grade of useful minerals, the recovery rate of valuable elements is not high. High, low resource utilization
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Embodiment 1
[0024] Raw materials are rare earth tailings from Baotou Steel tailings pond, in which iron minerals are mainly hematite and a small amount of magnetite, iron silicate and iron carbonate; rare earth minerals are mainly bastnaesite, bastnaesite and Monazite; niobium minerals are mainly niobite, niobium-iron rutile, yellow green stone and fractalite; other minerals are mainly silicate minerals, fluorite, carbonate minerals and a small amount of apatite, barite, quartz, Feldspar, pyrite, manganese minerals, etc. The total iron content in the rare earth tailings is 19.73%, and the grades of rare earth, niobium and fluorite are: 4.8%, 0.13%, and 26.42%, respectively. The particle size of rare earth tailings is -200 mesh 36.95%. According to the nature of minerals, the process of comprehensive recovery of valuable components is as follows:
[0025] Grind the raw materials until the content is 88.5% below 200 mesh, and then perform weak magnetic separation under the magnetic field ...
Embodiment 2
[0031] The raw material in this example is the tailings after flotation recovery of rare earth in a concentrator in the south, in which the total iron content is 15.56%, and the grades of rare earth, niobium and fluorite are: 5.6%, 0.19% and 24.57% respectively. Up to -200 mesh 69.78%.
[0032] Grind the raw materials to 90% of the content below 200 mesh, and then perform weak magnetic separation under the magnetic field strength of 1600 Oersted to obtain iron concentrate products with an iron grade of 61.46% and a recovery rate of 20.87%; the tailings of weak magnetic separation The ore is subjected to strong magnetic separation at a magnetic field strength of 18,000 Oersted to obtain a strong magnetic separation concentrate containing iron, niobium and rare earths, and a strong magnetic separation tailings containing fluorspar.
[0033] Strong magnetic separation tailings are used for flotation enrichment and recovery of fluorite. First, adjust the slurry, the pulp concentr...
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Abstract
The invention relates to a method for comprehensively recycling valuable compositions of rare earth, iron, niobium and fluorite in rare-earth tailings, and belongs to the fields of comprehensive resource utilization technologies and mineral processing engineering. The rare earth, the iron, the niobium and the fluorite in the rare-earth tailings are efficiently and comprehensively recycled by the method including 'grinding the rare-earth tailings, performing low-intensity magnetic separation, performing high-intensity magnetic separation on weak-intensity magnetic tailings, performing flotation on high-intensity magnetic tailings to obtain fluorite in the high-intensity magnetic tailings, performing flotation separation on high-intensity magnetic concentrates to obtain rare earth, iron and niobium in the high-intensity magnetic concentrates, reducing and roasting base flows, performing low-intensity magnetic separation to obtain iron and niobium in the base flows and performing flotation on low-intensity magnetic tailings to obtain niobium in the low-intensity magnetic tailings according to characteristics that the rare-earth tailings contain the various valuable compositions. Compared with a method for singly recycling one or two valuable compositions, the method has the advantages that the purpose of comprehensively recycling the valuable compositions in the rare-earth tailings can be effectively achieved, secondary resources can be sufficiently utilized, and the method has excellent economical and social benefits.
Description
technical field [0001] The invention relates to a method for comprehensively recovering rare earth, iron, niobium and fluorite from rare earth tailings. It belongs to the field of resource comprehensive utilization and mineral processing engineering. Background technique [0002] The development of rare earth beneficiation technology in China is slow, and there are problems such as high production cost, low quality of concentrate, low recovery rate, low comprehensive utilization rate of rare earth resources and associated useful components. At present, the resource recovery rate of domestic state-owned rare earth mines is generally 60%, and that of private mines is generally less than 40%. The unique ionic rare earth ores in the southern region of my country are medium-to-heavy rare earth resources that are rare in the world and have limited reserves. The current average utilization rate is only 20% to 50%. my country's largest Baotou mixed rare earth mine recycles and uti...
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