00000nam 2200000za 4500 9.841401 CaOODSP 20221107152058 cr ||||||||||| 170810s1970 onc ob f000 0 eng d CaOODSP eng eng fre n-cn--- M34-20/125E-PDF M34-20/125 Barkley, D. The determination of rare earths in Canadian ores. Part I, Chemical isolation and gravimetric determination of total rare earths [electronic resource] / D. Barkley, Extraction Metallurgy Division. Ottawa : Information Canada, 1970. v, 34 p. Technical bulletin ; TB 125 Cover title. "July 1970." Digitized edition from print [produced by Natural Resources Canada]. Includes bibliographical references. “A procedure is described for the chemical isolation and gravimetric determination of total rare earths, including yttrium, in Canadian ores and related products. The method involves a combination of two or more separation procedures, depending on the sample matrix. Precipitation processes are used to disengage the rare earths from macro amounts of interfering ions, while an 8-quinolinol solvent extraction procedure is instrumental in removing low-level impurities. The recovery and the purity of the rare earths are both very good, so that the method provides accurate values for the total rare-earth content. The average relative standard deviation for ores with an average content of 0.17 per cent is ± 1.9 per cent, and for chemical rare-earth concentrate products, with an average content of 39 per cent, the precision is ± 0.2 per cent. The high rejection of non-rare-earth elements also greatly simplifies the subsequent determination of individual rare earths by X-ray emission spectrometry. One sample in duplicate can be processed in about 3 days, while 6 samples can be analyzed within a 5-day period"--Summary, p. i. Includes summary in French. gccst Minerals gccst Metals gccst Analysis Canada. Natural Resources Canada. Canada. Mines Branch. Technical bulletin (Canada. Dept. of Energy, Mines and Resources. Mines Branch) TB 125 (CaOODSP)9.834857 PDF 1.69 MB https://publications.gc.ca/collections/collection_2017/rncan-nrcan/M34-20/M34-20-125-eng.pdf 300010