Electrochemical and metallurgical industry . pparatus is intended for plating the inside of ferrules,rings, bands, slip nipples, etc. The articles are strung on theanode bar, which is then inserted in the galvanizing rest upon a series of V-shaped troughs, along the innerwalls of which extend one or more metallic strips. The latterform the connection with the negative terminal of the current,and thus constitute the articles to be plated cathodes. Whenthe current is passed the inside of the hollow articles will becovered with a deposit. Process of Stripping Tin.—D. W. Hemingway, W
Electrochemical and metallurgical industry . pparatus is intended for plating the inside of ferrules,rings, bands, slip nipples, etc. The articles are strung on theanode bar, which is then inserted in the galvanizing rest upon a series of V-shaped troughs, along the innerwalls of which extend one or more metallic strips. The latterform the connection with the negative terminal of the current,and thus constitute the articles to be plated cathodes. Whenthe current is passed the inside of the hollow articles will becovered with a deposit. Process of Stripping Tin.—D. W. Hemingway, Walthamstow,England. Patent 791,555, June 6, 1905. Application filedOct. 29, 1902. The process depends upon the use of a solution of persul-phate of iron, which is contained in the tank A in Fig. 2. Thebath is acidified by the addition of sulphuric acid. The tinnediron clippings from which the tin is to be removed are im-mersed in this solution. After the tin has become dissolved avalve a in the pipe a is opened and the solution drawn into. FIG. 2.—.STRIPPING TIN. the electrolytic vessel B, where it is electrolyzed between ironanodes and copper or tinned copper cathodes. When thegreater portion of the tin has been deposited upon the cathode,the electrolyte passes by way of the valve b and pipe b into thevessel D. In this vessel the solution is restored by the addi-tion of nitrate of soda or potash, either alone or with sul-phuric acid. Other oxidizing agents may be substituted forthis mixture. The vessel D has an outlet F for the nitrousvapors, and is surounded by a jacket M, for the purpose ofheating its contents. After the electrolyte has become suf-ficiently oxidized, the liquor is withdrawn through valve dand pipe d into the vessel L, where pump N transfers it backinto the vessel A. When the quantity of persulphate of ironemployed is to be reduced to a minimum, the tin scrap may beadded directly to a solution of nitrate of soda, or potash,mixed with sulphuric acid, from
Size: 1891px × 1322px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectmetallurgy
