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| 02496cam 2200349za 4500 |
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| 001 | 9.841401 |
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| 003 | CaOODSP |
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| 005 | 20221107152058 |
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| 007 | cr ||||||||||| |
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| 008 | 170810s1970 onc ob f000 0 eng d |
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| 040 | |aCaOODSP|beng |
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| 041 | |aeng|bfre |
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| 043 | |an-cn--- |
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| 086 | 1 |aM34-20/125E-PDF|zM34-20/125 |
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| 100 | 1 |aBarkley, D. |
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| 245 | 14|aThe determination of rare earths in Canadian ores. |nPart I, |pChemical isolation and gravimetric determination of total rare earths |h[electronic resource] / |cD. Barkley, Extraction Metallurgy Division. |
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| 260 | |aOttawa : |bInformation Canada, |c1970. |
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| 300 | |av, 34 p. |
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| 490 | 1 |aTechnical bulletin ; |vTB 125 |
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| 500 | |aCover title. |
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| 500 | |a"July 1970." |
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| 500 | |aDigitized edition from print [produced by Natural Resources Canada]. |
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| 504 | |aIncludes bibliographical references. |
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| 520 | |a“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. |
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| 546 | |aIncludes summary in French. |
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| 692 | 07|2gccst|aMinerals |
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| 692 | 07|2gccst|aMetals |
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| 692 | 07|2gccst|aAnalysis |
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| 710 | 1 |aCanada. |bNatural Resources Canada. |
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| 710 | 1 |aCanada. |bMines Branch. |
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| 830 | #0|aTechnical bulletin (Canada. Dept. of Energy, Mines and Resources. Mines Branch)|vTB 125|w(CaOODSP)9.834857 |
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| 856 | 40|qPDF|s1.69 MB|uhttps://publications.gc.ca/collections/collection_2017/rncan-nrcan/M34-20/M34-20-125-eng.pdf |
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