Canadian mining journal January-June 1905 . by a motor in the motor room and conveys the carsto the floor (g), there the dust from the Sixty Foot Flue is stored in bins (h) preparatory to being drawn off and taken tothe briquetting plant. The dust from the One Hundred andSeventy Foot Flue is run direct to bins and then to the charg-ing floor of the arsenic plant, here it is roasted in Brucknerfurnaces that communicate with condensing chambers, thewaste gases passing through into the Sixty Foot Flue. Varying depths of from six inches to six feet of dust werefound in the flue, the average assay
Canadian mining journal January-June 1905 . by a motor in the motor room and conveys the carsto the floor (g), there the dust from the Sixty Foot Flue is stored in bins (h) preparatory to being drawn off and taken tothe briquetting plant. The dust from the One Hundred andSeventy Foot Flue is run direct to bins and then to the charg-ing floor of the arsenic plant, here it is roasted in Brucknerfurnaces that communicate with condensing chambers, thewaste gases passing through into the Sixty Foot Flue. Varying depths of from six inches to six feet of dust werefound in the flue, the average assay being eight per cent,arsenious oxide and ten per cent, copper. Velocity of gases in the flue is about 1,300 feet per minuteand the volume 211,268 cubic feet per minute. Cold air is admitted into the flue through openings at eand e Fig. i as a means of regulating the temperature. One Hundred and Twenty Foot Flue. | In this part of the flue the area of the 60 ft. flue is doubledand it is really a flue formed by building two sixty foot flues;. THE CANx\DIAN MINING REVIEW. side by side-; the outside walls are of the same thickness, andthe partition between the east and the west side is built asshown in Fig. 14. In the construction of the roof, however,there is a decided difference, as in this part, to permit ofgreater heat radiation, instead of bricks the covering is ^ inchsteel plate riveted to 7 inch I beams spaced 40 inch are supported by 15 inch I beam columus. The tunnelsand baffle walls are constructed as before described; thelength of the flue measured horizontally is 995 feet but, owingto the difference in elevation of the ends (350 feet), the actuallength is about 1050 feet. The velocity of the gases is aboutone-half that given for the sixty foot flue. The flue dust here is nearly all deposited in the part nextthe furnaces, and as the stack is approached the depth de-creases until on the last few sections enough could not beobtained to form a sample. Usually
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