BACKGROUNDThe toxic and hazardous elements in manganese ore not only affect manganese purification, production environment and product quality, but have also always been a technical problem in the manganese industry and particularly in experimental testing. At present, there are a total of 10 existing manganese ore composition analysis standard materials in the world, all of which lack the certified values of harmful components such as Cl, F, Co, Cr, Hg and As. Therefore, they do not meet the needs of manganese purification research, environmental monitoring, manganese ore import and detection method research.
OBJECTIVESTo prepare manganese ore composition analysis standard materials with quantitative values for Cl, F, As, Pb, Cd, Cr and Hg.
METHODSTwo certified chemical composition reference materials of manganese ore (GBW07139, GBW07140) were prepared by collecting samples from 3 large-scale manganese mining areas in Hunan Province and Xinjiang Autonomous Region. According to the type of deposit, all the samples passed the 97μm standard sieve and the initial uniformity inspection, and were packed into the smallest packaging unit individually or in combination.
RESULTSFor the uniformity test of randomly selected 2×30 bottles, the measured values of F were all less than F0.05(29, 60)=1.59, and the relative standard deviation was between 0.45% and 6.44%, indicating good uniformity of the samples. The long-term stability/short-term stability test was carried out within one year, and the linear model/average consistency data showed no significant difference, indicating good stability of samples. Ten laboratories participated in the collaborative certified value research, which included 23 components such as Mn, MnO2, SiO2, Al2O3, Fe, CaO, MgO, K2O, Na2O, TiO2, S, P, Cu, Co, Zn, Ni, Pb, Cd, Hg, Cr, As, Cl and F. In the two manganese ore composition analysis standard materials, the mass fractions of Mn were 21.63% and 41.55%, Cl were 38×10-6 and 1214×10-6, Ni were 1075×10-6 and 30.9×10-6, respectively.
CONCLUSIONSThis batch of manganese ore composition analysis standard materials contain certified values of Cl, F, Pb, Cd, Cr, Co, Hg and As, and is suitable for quality control of manganese-related analysis and testing.