A new type of Nb (Ta)–Zr(Hf)–REE–Ga polymetallic deposit in the late Permian coal-bearing strata, eastern Yunnan, southwestern China: Possible economic significance and genetic implications

Dai, Shifeng; Zhong, Yiping; Zhang, Mingquan; Wang, Xibo; Wang, Jumin; Song, Xiaolin; Jiang, Yaofa; Luo, Yadan; Song, Zhen-Tao; Zong, Yongqiang; Ren, Dongdong

doi:10.1016/j.coal.2010.04.002

Cited by 129 publications

(81 citation statements)

References 18 publications

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“…For example, when the separation density is assumed to be 1.50 g/cm 3 , the concentration of REE, Zr and Nb in the ash of cleaned coal would be up to 1248.87 µg/g, 1126.23 µg/g and 134.19 µg/g, respectively. REE, Nb, Ta, Zr, Hf and U were found to have been enriched in volcanic-ash-influenced Late Permian coal [45,46] and coal-bearing strata [47] from southwestern China, showing potential as a rare metal resource for industrial extraction [48]. Therefore, more attention should be given to the enrichment of these elements in coal from this region.…”

Section: Distribution Of Trace Elements During Gravity Separationmentioning

confidence: 99%

Washability and Distribution Behaviors of Trace Elements of a High-Sulfur Coal, SW Guizhou, China

et al. 2018

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Abstract:The float-sink test is a commonly used technology for the study of coal washability, which determines optimal separation density for coal washing based on the desired sulfur and ash yield of the cleaned coal. In this study, the float-sink test is adopted for a high-sulfur Late Permian coal from Hongfa coalmine (No.26), southwestern Guizhou, China, to investigate its washability, and to analyze the organic affinities and distribution behaviors of some toxic and valuable trace elements. Results show that the coal is difficult to separate in terms of desulfurization. A cleaned coal could theoretically be obtained with a yield of 75.50%, sulfur 2.50%, and ash yield 11.33% when the separation density is 1.57 g/cm 3 . Trace elements' distribution behaviors during the gravity separation were evaluated by correlation analysis and calculation. It was found that Cs, Ga, Ta, Th, Rb, Sb, Nb, Hf, Ba, Pb, In, Cu, and Zr are of significant inorganic affinity; while Sn, Co, Re, U, Mo, V, Cr, Ni, and Be are of relatively strong organic affinity. LREE (Light rare earth elements), however, seem to have weaker organic affinity than HREE (Heavy rare earth elements), which can probably be attributed to lanthanide contraction. When the separation density is 1.60 g/cm 3 , a large proportion of Sn, Be, Cr, U, V, Mo, Ni, Cd, Pb, and Cu migrate to the cleaned coal, but most of Mn, Sb and Th stay in the gangue. Coal preparation provides alternativity for either toxic elements removal or valuable elements preconcentration in addition to desulfurization and deashing. The enrichment of trace elements in the cleaned coal depends on the predetermined separation density which will influence the yields and ash yields of the cleaned coal.

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Section: Distribution Of Trace Elements During Gravity Separationmentioning

confidence: 99%

Washability and Distribution Behaviors of Trace Elements of a High-Sulfur Coal, SW Guizhou, China

et al. 2018

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“…The organically and associated trace elements tend to be vaporized, either escaping to the atmosphere or are adsorbed on the fine fly ash particles upon combustion in the furnace. The inorganically associated elements are generally non-volatile or have very low volatility and tend to be retained in the bottom ash and in the fly ash particles upon combustion (Dai et al 2010;Finkelman 1994;Huang et al 2004;Liu et al 2005Liu et al , 2004Querol et al 1995;Spears & Zheng 1999;Vassilev & Braekman-Danheux 1999;Vejahati et al 2010), though partitioning of trace elements also depends on the natural volatility of these elements (Clarke & Sloss 1992;Miller 2011;Querol et al 1995;Suárez-Ruiz & Ward 2008;Vejahati et al 2010). …”

Section: Modes Of Occurrencementioning

confidence: 99%

Geochemistry of Trace Elements as one of the Important Coal Quality Parameter: An Example from Balingian Coal, Malaysia

Sia¹,

Abdullah²

2017

JSM

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“…Furthermore, with respect to the increasing challenges of global warming and other environmental issues, the utilization of coal resources is increasingly encouraged to be economically effective and environmentally benign [2,3]. Hence, some coal-bearing strata have been regarded as promising alternative sources for rare metals recovery, to which many researchers around the world have paid great attention in recent years [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. There are already some precedents in the case of rare metal extraction from coal and coal-related materials.…”

Section: Introductionmentioning

confidence: 99%

“…From the perspective of industrial production, coal can be considered as metalliferous at the level of trace element concentrations being at least 10 times greater than the corresponding averages of world coal [1]. Many studies have shown that not only coal but some of the non-coal rock strata within or adjacent to the coal seams are also enriched in various valuable metals [8,[12][13][14]. Due to the gradual depletion of many conventional rare metal ores and the difficulties in exploring new deposits, alternative rare metal sources are urgently needed to be discovered and exploited [7,8].…”

Section: Introductionmentioning

confidence: 99%

Leaching Process of Rare Earth Elements, Gallium and Niobium in a Coal-Bearing Strata-Hosted Rare Metal Deposit—A Case Study from the Late Permian Tuff in the Zhongliangshan Mine, Chongqing

Zou

Tian

Wang

2017

Metals

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Abstract:The tuff, a part of coal-bearing strata, in the Zhongliangshan coal mine, Chongqing, southwestern China, hosts a rare metal deposit enriched in rare earth elements (REE), Ga and Nb. However, the extraction techniques directly related to the recovery of rare metals in coal-bearing strata have been little-studied in the literature. The purpose of this paper is to investigate the extractability of REE, Ga and Nb in the tuff in the Zhongliangshan mine using the alkaline sintering-water immersion-acid leaching (ASWIAL) method. The results show that ASWIAL can separate and extract REE, Ga and Nb effectively under the optimized conditions of calcining at 860 • C for 0.5 h with a sample to sintering agent ratio of 1:1.5, immersing at 90 • C for 2 h with 150 mL hot water dosage, and leaching using 4 mol/L HCl at 40 • C for 2 h with a liquid-solid ratio of 20:1 (mL:g). The final leaching efficiencies of REE and Ga are up to 85.81% and 93.37%, respectively, whereas the leaching efficiency of Nb is less than 1%, suggesting the high concentration of Nb in the leaching residue, which needs further extraction.

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A new type of Nb (Ta)–Zr(Hf)–REE–Ga polymetallic deposit in the late Permian coal-bearing strata, eastern Yunnan, southwestern China: Possible economic significance and genetic implications

Cited by 129 publications

References 18 publications

Washability and Distribution Behaviors of Trace Elements of a High-Sulfur Coal, SW Guizhou, China

Washability and Distribution Behaviors of Trace Elements of a High-Sulfur Coal, SW Guizhou, China

Geochemistry of Trace Elements as one of the Important Coal Quality Parameter: An Example from Balingian Coal, Malaysia

Leaching Process of Rare Earth Elements, Gallium and Niobium in a Coal-Bearing Strata-Hosted Rare Metal Deposit—A Case Study from the Late Permian Tuff in the Zhongliangshan Mine, Chongqing

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