Mineralogical factors affecting the separation behavior of Ta-Nb-bearing minerals in the gravity field: mineral grain size, liberation, and association relationship

IF 1.3 4区 工程技术 Q4 CHEMISTRY, PHYSICAL
Hongwei Cheng, Jian Xu, Shoujing Wang, Zihu Lv, Fushuai Wei, Dengkui Zhao, Dongyin Wu
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Abstract

Gravity separation is the primary method used to beneficiate Ta-Nb-bearing minerals, however, it performs poorly in low-grade and fine-grained ores. A comparative study of gravity separation products (concentrate, middlings, and tailings) reveals the factors affecting the separation behavior of Ta-Nb-bearing minerals in the process combined with a spiral chute and shaking table from the perspective of mineralogy. The results reveal that columbite-tantalite is the principal Ta-Nb-bearing mineral. The grain size of columbite-tantalite in the concentrate is the coarsest, followed by that in the middlings, and the finest in the tailings, which are mainly distributed in the range of -150+38 μm, -75+20 μm, and-38 μm, respectively. The liberation degree of columbite-tantalite in the concentrate and tailings is positively correlated with grinding time, while that in the middlings is negatively correlated with grinding time. The density of columbite-tantalite-bearing particles in concentrate is mainly distributed above 3 or even 4, due to the high liberation degree of the columbite-tantalite in the concentrate, as well as the high amount of rich intergrowth associated with heavy minerals. The density of Ta-Nb-bearing mineral particles in the middlings and tailings is predominantly distributed in D<3. It demonstrates that the liberation degree is not the most essential factor in determining columbite-tantalite separation behavior in the gravity field, and the mineralogical characteristics of columbite-tantalite including grain size, association relationship, and particle density, may be more important. The results of this investigation can provide theoretical support for the strengthening separation of low-grade tantalum-niobium ore.
重力场中影响含ta - nb矿物分离行为的矿物学因素:矿物粒度、解离和缔合关系
重选是选别含钽铌矿物的主要方法,但重选在低品位、细粒矿石中效果不佳。通过对重选产物(精矿、中矿和尾矿)的对比研究,从矿物学角度揭示了螺旋溜槽和振动台结合重选过程中影响含钽铌矿物分离行为的因素。结果表明,铌钽矿是主要的含钽铌矿物。精矿中铌钽矿粒度最粗,中矿次之,尾矿中粒度最细,主要分布在-150+38 μm、-75+20 μm和38 μm范围内。精矿和尾矿中铌钽矿的解离度与磨矿时间呈正相关,中矿中铌钽矿解离度与磨矿时间呈负相关。精矿中含铌钽矿颗粒的密度主要分布在3甚至4以上,这是由于精矿中铌钽矿解离度高,且与重矿物伴生的富共生量大。2 .中尾矿中含ta - nb矿物颗粒密度主要分布在D<结果表明,在重力场作用下,解离度并不是决定铌钽分离行为的最重要因素,铌钽的粒度、缔合关系和颗粒密度等矿物学特征可能更为重要。研究结果可为低品位钽铌矿的强化分离提供理论支持。
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来源期刊
Physicochemical Problems of Mineral Processing
Physicochemical Problems of Mineral Processing CHEMISTRY, PHYSICAL-MINING & MINERAL PROCESSING
自引率
6.70%
发文量
99
期刊介绍: Physicochemical Problems of Mineral Processing is an international, open access journal which covers theoretical approaches and their practical applications in all aspects of mineral processing and extractive metallurgy. Criteria for publication in the Physicochemical Problems of Mineral Processing journal are novelty, quality and current interest. Manuscripts which only make routine use of minor extensions to well established methodologies are not appropriate for the journal. Topics of interest Analytical techniques and applied mineralogy Computer applications Comminution, classification and sorting Froth flotation Solid-liquid separation Gravity concentration Magnetic and electric separation Hydro and biohydrometallurgy Extractive metallurgy Recycling and mineral wastes Environmental aspects of mineral processing and other mineral processing related subjects.
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