. Journal . ashed with hiwater till lrce from all traci ido, and the filti I api i i to a flask. S iodine Bolution i- run into the flask to leaveore than 5 , SO to SS very dilute hydrochloric acid are now addthe 1la-k thoroughly shaken to break n|• theAfter standing a few minutes the contents of the with decinormal thiosulphate solution and thiof iodine determined. If X = the number of ol Niodine solution taken and Y = the number of solution, then (X-Y> o-003:25 =gzinc per cent.—II. 1. I Malting of Ores at Leadoille and liihinsun, <
. Journal . ashed with hiwater till lrce from all traci ido, and the filti I api i i to a flask. S iodine Bolution i- run into the flask to leaveore than 5 , SO to SS very dilute hydrochloric acid are now addthe 1la-k thoroughly shaken to break n|• theAfter standing a few minutes the contents of the with decinormal thiosulphate solution and thiof iodine determined. If X = the number of ol Niodine solution taken and Y = the number of solution, then (X-Y> o-003:25 =gzinc per cent.—II. 1. I Malting of Ores at Leadoille and liihinsun, < C. II. Doolittle. Eug. and -Mining J., 19u:). 7a lie.—The plant comprised three furnaces hatdimensions, at the tuyeres, ,IC by li,3 ins., 3d bj as.,respectively. The first two wifor concentrating the ore in rade matte, tl and largest one for re-concentrating the n atte with taddition ol oxidised silore-. I rich furnace »worked with a coldfurnished by a No. T Hiblower. Two fans, one 9and one !t. in per ton-A. 8. it is effected by means of two 3-in. centrifugalpumps, D, attached to each tank, the suctionbeing near the surface of the charge and thedischarge near the bottom. When the agitationis completed, one pump is shut off. and thesuction of the other is changed to the bottomof the charge. The pulp is then fed into afilter-press, C, and the press cakes washed tillthe wash liquor contains only 0-S lb. of potas-sium cyanide per ton. The solution and wash-ings are pumped to Storage tanks, and thenceto zinc boxes. E, where precipitation is effectedb\ means of filiform zinc. The extract]values from the slimes is slated to be 98 percent, by this method. 94 per cent, of the headvalue being recovered Thi actual cositreatment is said not to exci 90 Cyatiid: Solution.*: Tin Regeneration of Working when Zinc Precipitation is used. A. 1 ■. Crosse 3Chem. Mctall. and Mining Soc. of S. Africa, 1903, 3,[11], 163—165. -sii u cyanide is recovered from the douhli cyanide o
Size: 1520px × 1645px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
