Page 11 Advertisement 1

New Zealand Listener, Volume 32, Issue 808, 21 January 1955, Page 11

BLA ST AND COUNTERBLA ST The inside of a blast furnace deteriorates with use and every three to five years the refractory material with which it is lined has to be renewed. First, the furnace must be allowed to cool, then the old lining-up to 1,000 tons of it-must be prised out by men with crowbars and pneu- matic hammers In order to save time, many steel works have called in ICI whose Nobel Division in Glasgow has developed a special technique; using new explosives, which enables furnace linings to be blasted out when still hot- without the delay of waiting for the shot holes to cool down to normal temperatures. With this technique; a blast furnace at Scunthorpe in Lincolnshire was relined in the record time of 22 days, 23 hours and 30 minutes without damage to either the outer shell of the furnace or adjacent plant: A fair average time for the explosive method would be 40 days, as against about 150 days. by the old hammer and crowbar method. This speed-up in the relining of furnaces is equivalent to a 4% increase in the total steel-producing capacity of the United Kingdom. ICI IMPERIAL CHEMICAL INDUSTRIES (NZ) LTD Keep away MOTHS with 4 MOTHAKS 8r68 Don't let moths ravage valuable clothing hang MOTHAKS in Your wardrobe; have at least one 6 every drawer: Mothaks keep clothes moth-free and fresh: NZ: Agents: J. La Lennard Ltds, Box 1497 . Wellington I/3 FOR A BAG Of 8-ALL CHEMISTS @Th 2