Bulletin . ^Etna mine retort, ante). In the tirst case above-mentioned. Patriquinconsiders that complete condensation is obtained with the arrangementas it stands. He points to the fact that after the steam ceases to comeoff (about -to to 60 minutes after charging), that the condenser pipe iscool up to within 18 to 2-t from the retort wall. Also that, at onetime for awhile, he had a cover over the ends of the condenser pipes asa safeguard against theft, during which period the pipes were alwayshot for their full length, and mercurial fumes could be detected coming 258 CALIFORNIA STATE MINING B
Bulletin . ^Etna mine retort, ante). In the tirst case above-mentioned. Patriquinconsiders that complete condensation is obtained with the arrangementas it stands. He points to the fact that after the steam ceases to comeoff (about -to to 60 minutes after charging), that the condenser pipe iscool up to within 18 to 2-t from the retort wall. Also that, at onetime for awhile, he had a cover over the ends of the condenser pipes asa safeguard against theft, during which period the pipes were alwayshot for their full length, and mercurial fumes could be detected coming 258 CALIFORNIA STATE MINING BUREAU. from the end of the box. With the present, open arrangement, exceptfor the steam already noted, there are no visible fumes nor noticeablemercurial odors. It does not seem reasonable to expect that condensa-tion could be complete in so short a distance. This point can bedefinitely determined only by sampling and analyzing the escapinggases over a period of operation. However, the volume of gas to be. Photo No. 59. Barrel Condensers, at New Idria Mine, San Benito County. cooled from a retort is very much less in proportion to the tonnage ofore treated, as compared with the large furnaces. Large Chamber Condensers. When we come to condensers for the larger, continuous-feed furnaces(the Scott will be taken as typical, as there are more of them in use,and the condensing problem is practically the same for all the largetypes, both coarse-ore and fine), the situation become more we have to deal with not simply the vai)ors driven out from the QUICKSILVER RESOURCES. 259 ore mass, but mixed with them are the products of fuel questions of relative sizes, volumes and numbers of condensingchambers, materials for their construction, gas velocities, and temper-atures, become essential. So far, they have been almost entirelyworked out on the guess and try-on .system. Previous to the investi-gations now under way by the United States Bureau of Mines, the only
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