. Transactions of the Institution of Mining Engineers . 16 TRANSACTIONS INSTITUTION OF MINING ENGINEERS. [Vol. LXII. conductivity, as will be seen from the graph in Fig. 2 (h). Thedecomposition zone in (6) has practically disappeared, and the heatpassed through the charge with greater rapidity on this account. Another way in Avhich the increased rate of carbonization can bedemonstrated is by partly carbonizing charges of treated and untreated. Fig. 4.—Partly-carbonized Charges: (A) Thorncliffe Coal; and (B) SameCoal Mixed with 40 per cent, of Coke-breeze. coal side by side in a furnace. Fig 4
. Transactions of the Institution of Mining Engineers . 16 TRANSACTIONS INSTITUTION OF MINING ENGINEERS. [Vol. LXII. conductivity, as will be seen from the graph in Fig. 2 (h). Thedecomposition zone in (6) has practically disappeared, and the heatpassed through the charge with greater rapidity on this account. Another way in Avhich the increased rate of carbonization can bedemonstrated is by partly carbonizing charges of treated and untreated. Fig. 4.—Partly-carbonized Charges: (A) Thorncliffe Coal; and (B) SameCoal Mixed with 40 per cent, of Coke-breeze. coal side by side in a furnace. Fig 4 (A) and (B) shows photographsobtained from experiments of this kind. Charge (A) consisted of Thorn-cliffe coal, and charge (B) of the same seam with 40 per cent, of breeze added. Both wereput into the muffletogether at a tempera-ture of 900° Cent.,and were withdrawnafter 15 minutes(normally, 40 minuteswould be required tocomplete carboniza-tion). It will be seenthat (B) is carbonizedpractically to thecentre, while the heathad not penetrated toa greater depth thanI inch in (A); thecore of the latter wasquite unfused, andfell away as increased conductivity is, therefore, not due solely to thepresence of carbon in the form of fine coke, but also to the destruction ofthe decomposition zone as a result of utilizing the surplus cementing-material to bind the inert coke. This zone will also disappear if thebinder is partly destroy
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