Chemical engineering . il the desulphurization of theore is complete. Ihc material is then ready for treatment inthe blast furnace. H. M. Heath, G. Morricc and R. L. J. Gruss ( 14) patent a modification of the process of roastingauriferous ores containing sulphur or arsenic (sniphurets).preliminary to the chlorinalion process for the extraction ofthe gold. If the sulphurets arc roasted with access of air. atemperature of ° F. is required, and the treatment re-quires considerable time. The inventors propose to carry outthe roasting process not in presence 0/ air but of oxygen.
Chemical engineering . il the desulphurization of theore is complete. Ihc material is then ready for treatment inthe blast furnace. H. M. Heath, G. Morricc and R. L. J. Gruss ( 14) patent a modification of the process of roastingauriferous ores containing sulphur or arsenic (sniphurets).preliminary to the chlorinalion process for the extraction ofthe gold. If the sulphurets arc roasted with access of air. atemperature of ° F. is required, and the treatment re-quires considerable time. The inventors propose to carry outthe roasting process not in presence 0/ air but of oxygen. 104 FXECTROCHE^rICAL AXD METATXlRGTCAL INDUSTRY. [Vol. III. No. Under ;c circiimstaiices a temperature of (xx) F. only isneeded, and the time of treatment is considerably he inventors use a roasting furnace with a vertical flue of-inuous or zigzag form, through which the auriferous orepasses downwards, while oxygen is passed upwards from anoxygen-generator connected to the lower terminal of the FIG. FfRX.\rE. C. H. Repath and F. E. Marcy (patent 785,437. March to Frank Klepetko) patent a modification of furnace for zinc blende. The furnace is>hown in Fig. 1. The object is twofold: to oxidize all the orewitliout to save the sulphurous anhydride formed dur-ing the operation. The loss of ore in ordinary furnaces ismainly due to the upward draft of gases which carries the fineparticles of ore with it. To prevent this, the inventors causethe ore to slide from one hearth to the next below, instead ofletting it drop through space and encounter the upward draftof the gases. The sliding of the ore assists the action of therakes. The upper four hearths are provided with two rabble-arms each, the sixth and seventh with three rabble-arms, inorder to increase the stirring and discharge rather on one sideof the funiace. The construction of the furnace is describedin detail. Wf,t agitator for
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmetallu, bookyear1902
