00000000nam 2200000za 4500
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003CaOODSP
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008170810s1970    onc     ob   f000 0 eng d
040 |aCaOODSP|beng
041 |aeng|bfre
043 |an-cn---
0861 |aM34-20/125E-PDF|zM34-20/125
1001 |aBarkley, D.
24514|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.
260 |aOttawa : |bInformation Canada, |c1970.
300 |av, 34 p.
4901 |aTechnical bulletin ; |vTB 125
500 |aCover title.
500 |a"July 1970."
500 |aDigitized edition from print [produced by Natural Resources Canada].
504 |aIncludes bibliographical references.
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.
546 |aIncludes summary in French.
69207|2gccst|aMinerals
69207|2gccst|aMetals
69207|2gccst|aAnalysis
7101 |aCanada. |bNatural Resources Canada.
7101 |aCanada. |bMines Branch.
830#0|aTechnical bulletin (Canada. Dept. of Energy, Mines and Resources. Mines Branch)|vTB 125|w(CaOODSP)9.834857
85640|qPDF|s1.69 MB|uhttps://publications.gc.ca/collections/collection_2017/rncan-nrcan/M34-20/M34-20-125-eng.pdf
986 |a300010