Bulletin . n by placing the capsule e infront of the cone; a small open-ing in the closed end of this cap-sule permitted observation andmeasurement of the temperaturewith an optical pyrometer of theIIolborn-Kurlbaum type. Thetemperature measurements were checked in the usual manner by observing the melting points ofpure gold wire and crystals of diopside. The burner connectionswere so arranged that either natural gas or coal gas could be used,with air at a pressure of 2 pounds per square inch. Owing to thelow air pressure it was necessary to enrich the air with oxygen inorder to attain the hig
Bulletin . n by placing the capsule e infront of the cone; a small open-ing in the closed end of this cap-sule permitted observation andmeasurement of the temperaturewith an optical pyrometer of theIIolborn-Kurlbaum type. Thetemperature measurements were checked in the usual manner by observing the melting points ofpure gold wire and crystals of diopside. The burner connectionswere so arranged that either natural gas or coal gas could be used,with air at a pressure of 2 pounds per square inch. Owing to thelow air pressure it was necessary to enrich the air with oxygen inorder to attain the highest temperatures. The method of making and mounting the ash cone, its size, andthe rate of heating it were the same as in the tests with the No. 3gas furnace. The furnace was operated at all times under maximumreducing conditions, a flame issuing from the chimney to a height ofapproximately 6 inches. Table 21 following shows the results ofthese tests in comparison with those with the No. 3 melters Figure 33.—Modified No. 29 Meker furnace. 98 FUSIBILITY OF COAL ASH. Table 21. -Results of tests to determine softening temperatures in furnace and in modified Meker furnace. Ash sample No. Softening temperatures in— Differences. No. 3 furnacewith naturalgas. Mekerfurnace withnatural gas. Mekerfurnace with artificial gas. 2 and 3. 3 and 4. 1 2 3 4 5 6 86 °C. 1,0761,1251,1451,1561,1661,1721,1771,1981,2181,2291,2361,2501,2621,2771,3041,3161,3271,3251,3251,3411,401 °,0871,1341,1561,1651,1791,1531,1851,1951,2121,2341,2661,2481,2881,2711,3181,3291,2951,2831,2951, 2831,358 ,0741,1241,1151,1371,1771,1531,1841,1461,1891,2241,2761,2191,3291,2241,3161,3041,2951,2911,2881,3181,358 °C. -11 - 9-11 - 9-13+19 - 8+ 3+ 6 - 5-30+ 2-26+ 6-14-13+32+42+30+58+43 °C.+ 13+ 10+41+28+ 2 0+ 1+49+23+ 10-10+29-41+47+ 2+ 25 0- 8+ 7-35 0 88 83 11 69 100 90 93 17 68 97 76 13 18 72 67 74 95 89 91 77 + 4i + 9 1 I A representative lot of 21 coal ashes, varying in softening temper-atu
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
