Electrical separation of tar from coal gas

• Publisher: Elsevier Science
• Year: 1913
• Tongue: English
• Weight: 67 KB
• Volume: 175
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(13)90858-9

✦ Synopsis

Diminishing the Loss of Metal in Brass-founding. F. BENSEL.

(Metallurgie, ix, 523.)--The direct addition of zinc to melted copper in an electrically-heated crucible produced hardly any alloy, as the zinc volatilized and oxidized. Several attempts to substitute for the zinc an equivalent quantity of blende, the copper being in sufficient excess to form cuprous sulphide with the sulphur of the blende, and sodium sulphide being used as a flux, were also unsuccessful; the brass produced never contained more than about 12 per cent. of zinc, and great quantities both of copper and zinc were lost in the slag. Sodium and calcium carbonates used to flux the blende were also failures. Finally the metals were melted together in a closed egg-shaped fnrnace through the centre of which passed carbon electrodes joined by a rod of resistance carbon. The furnace could be rotated so as to agitate and mix the metals, and .had a covered opening through which the alloy could be poured. There was practically no loss of zinc, and the resulting brass was almost exactly of the composition, 7o: 3 o, it was calculated for. The cost of melting a ton of brass was about $1.5o for power, in a furnace taking a charge of 5 ° kilos., and about 55 cents for resistance carbon. The saving in zinc, as compared with the ordinary method of manufacture, may be taken at 60 cents per ton of brass.

Electrical Separation of Tar from Coal Gas. A. ~-L WHITE, J. W. HACKER, and F. STEERE. (f. Gas Lighting, cxix, 825. )-An electric separator for separating the tar from crude coal gas