Research on Process Mineralogy Characteristics and Pre-enrichment Technology of Vanadium-Bearing Stone Coal

doi:10.12068/j.issn.1005-3026.2025.20240050

Abstract

Abstract:

Shaanxi vanadium-bearing stone coal was selected as the research object. The raw ore was characterized by chemical element analysis， X-ray diffraction （XRD）， and an automatic quantitative analysis system （MLA）of mineral parameters. Systematic investigation into its elemental composition， mineral composition， occurrence state of vanadium， embedding relationship， and dissociation characteristics of vanadium-bearing minerals was conducted. On this basis， the spiral chute tailings discarding tests， flotation tailings discarding tests， and combined gravity-flotation tailings discarding tests of raw ores were carried out.When the mass fraction of V₂O₅ in the raw ore was 0.82%， combined gravity-flotation tailings discarding tests could obtain the pre-concentrate with a V₂O₅ mass fraction of 1.23%， a tailing yield of 41.97%， and a vanadium recovery rate of 87.37%. The study provides a reference for the efficient development and utilization of vanadium-bearing stone coal in China.

Key words: vanadium-bearing stone coal, process mineralogy, pre-enrichment tailing discarding, spiral chute, flotation

CLC Number:

TD 954

Shuai-hou YANG, Jian-ping JIN, Xin-ran ZHU, Zhen-ya ZHOU. Research on Process Mineralogy Characteristics and Pre-enrichment Technology of Vanadium-Bearing Stone Coal[J]. Journal of Northeastern University(Natural Science), 2025, 46(9): 135-142.

Figures/Tables 20

Fig.1 XRD analysis of raw ores

Table 1 Chemical composition analysis of raw ore(mass fraction)

V₂O₅	C	SiO₂	Al₂O₃	CaO	MgO	TFe	FeO	P	S	K₂O	Na₂O	烧失
0.82	0.93	86.64	2.81	1.42	0.54	1.59	0.23	0.26	0.086	0.863	0.006	2.54

Fig.2 Open-circuit test process for flotation tailings discarding in dodecylamine system

Fig.3 Particle size composition and vanadium distribution ratio of -1 mm raw ore

Fig.4 Distribution of mineral composition and mineral relationship of raw ore

Table 2 Mineral composition of raw ore(mass fraction)

石英	白云母	高岭石	金红石	褐铁矿	磷灰石	重晶石	钡长石	方解石	其他
88.84	4.96	0.57	0.13	1.48	1.92	0.84	0.39	0.48	0.38

Table 3 Distribution ratio of vanadium in

白云母	褐铁矿	金红石	高岭石
87.62	7.83	4.05	0.51

Fig.5 Particle size distribution of muscovite

Fig.6 Diagram of dissociation of muscovite

Fig.7 Schematic diagram of dissociation and association relationships of muscovite

Fig.8 Particle size distribution of quartz particles

Fig.9 Dissociation of quartz

Fig.10 Schematic diagram of dissociation and association relationships of quartz

Fig.11 Spiral chute tailings discarding test of feeding particle size

Fig.12 Test results of flotation pH condition

Fig.13 Relationship between dodecylamine dosage and separation index

Table 4 Open-circuit test results of flotation tailings

产品名称	产率	V₂O₅质量分数	钒回收率
合计	100.00	0.82	100.00
精矿1	38.16	1.38	64.22
精矿2	11.97	1.26	18.39
精矿3	9.12	0.58	6.45
尾矿	40.75	0.22	10.94

Fig.14 Mass flow sheet of closed circuit for flotation tailings discarding in dodecylamine system

Fig.15 Test process of combined gravity-flotation tailings discarding

Table 5 Test results of combined gravity-flotation

产品名称	产率	V₂O₅质量分数	钒回收率
合计	100.00	0.82	100.00
重选尾矿	27.49	0.24	8.04
浮选精矿1	44.86	1.33	72.76
浮选精矿2	13.17	0.91	14.61
浮选尾矿	14.48	0.26	4.59

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