Show sulphuric acid and compressed air WRITTEN FOR FOP THE MINING REVIEW in the manufacture of certain chemicals considerable danger and expense is caused by the rapid deterioration of piping and other receptacles with which the acids and fumes come in contact sulphuric acid is particularly destructive and many serious difficulties are encountered in its manufacture it is practically impossible to handle sulphuric acid with pumps as they would deteriorate so rapidly that constant replacement would be necessary the most satisfactory method of pump 5 V AM ca 7 1 ah Z 0 y motor driven compressor ing destructive acids is that used by the nichol syndicate in their new plant at bay point california at one stage of the process of manufacture the acid is accumulated in a cylindrical tank which is provided with suitable inlet and outlet valves when it is desired to pump the acid into other retainers the inlet valve is closed and air at from sixty to pounds is admitted which forces the liquid through the outlet valve to other parts of the plant the flow of the acid is controlled by suitable valves in the piping system dyste m to meet the increasing demand for apparatus that will handle destructive acids economically the united iron works of oakland california has brought out the motor driven compressor shown in the illustration the compressor is a gardner rix duplex speed r p m pressure sixty to pounds capacity forty cubic feet of air per minute the compressor is driven by a westinghouse type HF 3 phase 60 cycle volt motor rated at 10 h p r p m this type of motor is admirably suited to this work the secondary is phase wound and the three phases are connected to the three collector rings shown in starting the controller gradually cuts the starting resistance which is connected to the secondary through the collector rings this motor is so designed that an unusually high starting torque is developed with comparatively low starting current commercial ore in quantity has been bean exposed on the missoula copper mining companas comp anys property according to R C who also reports that a large body of milling ore is available for removal in a report to the stockholders he says the quartz ore assays essays 60 a ton there is a well defined mineral bearing vein consisting of nf from five to seven feet of quartz and altered quartz opened by a drift along the vein for feet from the main crosscut tunnel he adds indications are an ore shoot feet in length lies at greater depth |