. Journal . ar. For the production of com-mercial white zinc oxide, free from iron, which cannotbe obtained by the process described, the reaction of limeand carbon with zinc sulphide, was utilised : ZnS-fCaO-fC=CO+CaS-) furnace used was formed of a graphite crucible,110 cm. diam. inside, 65 cm. high. The results obtainedwere : Time of running, 600 hours ; weight of ore smelted,28,345 kilos. ; current, 3800 amps. ; , 42 volts ;powerfactor, 0-85 ; lime, 12,384 kilos. ; earbon,3146 kilos.;consumption of electrodes. 1286 kilos. ; zinc content ofcharge, 10,587 kilos. ; zinc oxide obta
. Journal . ar. For the production of com-mercial white zinc oxide, free from iron, which cannotbe obtained by the process described, the reaction of limeand carbon with zinc sulphide, was utilised : ZnS-fCaO-fC=CO+CaS-) furnace used was formed of a graphite crucible,110 cm. diam. inside, 65 cm. high. The results obtainedwere : Time of running, 600 hours ; weight of ore smelted,28,345 kilos. ; current, 3800 amps. ; , 42 volts ;powerfactor, 0-85 ; lime, 12,384 kilos. ; earbon,3146 kilos.;consumption of electrodes. 1286 kilos. ; zinc content ofcharge, 10,587 kilos. ; zinc oxide obtained. 12,370 kilos. ;cost of manufacture, 4598 francs (£182 7s.). The zinc oxide obtained contained 98-6-—99-0 per zinc oxide and 0-2—0-3 percent, of iron. According toits whiteness the oxide was divided into two brands,70 per cent, being of the better quality.—.J. W. H. Patents. Electro-deposition of metals ; Apparatus for . T. A. Smith and T. Deakin, \^alsall. Eng. Pat. 21,687,Oct. 14, A STATIONARY tank, a (see Fig.), contains the platingsolution and the anodes, c. A barrel, d, containing thematerial to be plated, arranged to rotate in this tankwith its axis at an angle of 35= or 40° to the lower end of the barrel is entirely closed. Thecathode connection is made bj- means of a brush or otherdevice, though tlie wheel, /(, the rod, n, 71, ifl, in theaxis of the barrel, to a number of arms, m, on the baseof the barrel. The axle is encased in fibre to preventcontact with the material being plated. The barrel isrotated by means of the worm wheel, h, and may belifted from the tank by releasing the adjustable screw, construction admits of the work being removedthrough the open end of the barrel, at any time duringthe process, for examination.—.J. W. H. EUctro-plaiiiig apparatus. R. Walker and W. 0. Pinson, Wolverhampton. Eng. Pat. 12,482, May 26, claim is for a basket for holding the articles to beplated, consisting of a w
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
