Yankuang ceshi (Jan 2021)
Preparation of Standard Materials for Composition Analysis of Stone Coal Vanadium Ore
Abstract
BACKGROUND The development and rational utilization of stone coal vanadium ore resources require accurate analysis of its components and quality control. At present, there is no standard material for composition analysis of vanadium ore in the world, and the existing standard material cannot meet the needs of exploration, development and research of vanadium ore in China, either in the content of vanadium pentoxide or in the certified values of other elements. OBJECTIVES To prepare standard materials for composition analysis of stone coal vanadium ore. METHODS Ore samples, roof and floor rocks and artificially stripped high-grade samples were collected from four large stone coal vanadium districts, including Xiaoyuanchong vanadium mine in Chongyang County, Hubei Province, the Niuguuping in Zhijiang County, Hunan Province, the Yantouzhai in Guzhang County, Hunan Province, and the Heichong in Fenghuang County, Hunan Province. The samples were subjected to jaw-type primary crushing, roller crushing, coarse-grain sieving and mixing, ore blending and mixing, disc fine grinding, fine-grain sieving, and inactivation. After passing the initial inspection, samples were bottled and numbered. RESULTS For the uniformity test of randomly selected 4×35 bottles, the measured values of F were all less than F0.05(34, 70)=1.60, and the relative standard deviation was between 0.31% and 7.48%, indicating good uniformity of the samples. Long-term and short-term stability tests were carried out on randomly selected samples, and no statistically significant difference was found, indicating good stability of the samples. Nine laboratories participated in the collaborative certified value research, which included 16 components such as V2O5, C and SiO2. Mass fractions of V2O5 in the four stone coal vanadium ore standard materials were 0.63%, 0.86%, 1.55%, 3.99%, covering cut-off grade of 0.50%, industrial grade of 0.70%, and rich-ore grade of ≥ 1%. Carbon contents of four standard materials were 2.40%, 3.46%, 5.60% and 7.27%, respectively. CONCLUSIONS The successful development of 4 standard substances (GBW07875, GBW07876, GBW07877, GBW07878) in this batch can provide reference for scientific utilization and research of stone coal vanadium ore.
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