Art. LIV.—Analyses (Technical) of New Zealand Coals.
[Read before the Philosophical Institute of Canterbury, 2nd November 1898.
Methods used in determining the Given Quantities.
Water.—Coal (3 gr. to 6 gr. in platinum boat) heated in toluol bath* (107° C), in current of dry coal-gas, and water given off absorbed in weighed chloride of calcium tube. Time of heating, three hours.
Ash.—The dry coal, from water-determination, heated in platinum boat over flat Teclu burner till of constant weight.
Sulphur.—-Eschka method, spirit flame only being used; checked where result seemed abnormal by Carius method.
Coke.—Muck's normal test in closed platinum crucible over free Bunsen flame.† Heating continued for thirty seconds after disappearance of luminous flame.
Heating Effect.—The values given are calculated according to a formula suggested by the American Coal Analysis Committee in their preliminary report. ‡ As the heating values 6f coals Nos. 1–10 had previously been directly determined by means of a Hempel calorimetric bomb, I was able to compare the values given by the formula with those obtained by absolute combustion. As these values, together with other details regarding coals Nos. 1–10, will shortly be published, I need here only remark that the American formula gives very good results for the hard coals (1-5), but that in the case of the brown coals (6–10) the values, though in the same relative order as those determined by actual combustion, are not so widely differentiated.
[Footnote] *Trans. N.Z. Inst., vol. xxx., p. 495.
[Footnote] † Muck, “Steinkohlenchemie,” p. 8.
[Footnote] ‡ Chem. News, 1898, p. 75.
[The section below cannot be correctly rendered as it contains complex formatting. See the image of the page for a more accurate rendering.]
|Reference Number||Name of Coal and Source of Specimen used.||Composition.||Coking||Heating Effect (calculated).|
|100 Paris Raw Coal contain||100 Parts Raw Coal give||100 Parts Coal Substance giv|
|Water.||Ash.||Sulphur.||Coal Substance.||Coke.||Fixed Carbon.||Volatile Matter other than Water.||Fixed Carbon.||Volatile Matter.||Calories per Kilogramme Fuel.||Unites-mass Water at Boiling-point per Unit mass Fuel.|
|6||Allandale From Canterbury College Engineering Department||12.61||6.88||1.77||78.68||49.05||42.17||37.28||53.59||46.41||6412.9||11.96|
|11||Brockley anthracite: new woking (taken at mina—W.P.E.)||9.29||5.38||1.22||84.11||88.65||83.87||2.06||99.71||0.29||6836.9||12.75|
|12||Brockley altered brown: new working (taken at mine—W.P.E.)||17.42||9.80||0.50||72.28||43.80||34.00||38.78||47.04||52.96||5853.1||10.92|
|13||Brockley altered brown: old working (from Canterbury College chemical department)||12.22||1.22||0.55||88.01||49.82||48.60||37.96||56.50||43.50||6963.6||12.91|
|14||Levick's Malvern: trade sample (per J T. Brown and Co.)||27.95||3.25||0.52||68.28||34.65||31.40||37.40||45.98||54.02||5531.1||10.31|
|15||Hometown (from tracks at mine—W. P. E.)||26.45||2.33||3.59||67.63||34.42||32.09||39.13||47.44||52.56||5603.0||10.45|
|16||Hikorangi (through R. D. Duxfield, Esq.)||5.86||2.92||3.80||87.42||46.35||43.43||47.79||49.61||50.33||7208.13.44|
|17||Kawakawa (through D. J Kirkpakick, Esq.)||3.09||2.50||4.92||89.49||47.50||45.00||49.41||50.28||39.72||7420.3||13.84|
|18||Westport-Cardiff: Hannah Hector outcrop (from Christchurch agents)||4.38||0.62||0.54||94.46||57.35||56.73||38.27||60.05||39.95||7644.7||14.26|