Process for the recovery of bismuth

Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

75 78, 423 94, 423494, C22B 3700

Patent

active

040393232

ABSTRACT:
Bismuth is recovered as elemental bismuth or as a Pb-Bi alloy from an air-pervious residue cake of de-bismuthizing dross of concentrated alkaline bismuthide content, by heating the cake in air to the ignition temperature of the cake to ignite the cake, and burning autogenously in a flameless or substantially flameless combustion the thus-ignited cake to oxidize the alkali and a portion of the lead to the exclusion of the bismuth. A powder-like residue, formed by the burning, comprises bismuth, lead, lead oxide and alkali oxide. The lead oxide and alkali oxide of the residue are then selectively dissolved in an oxide-dissolving flux, e.g. molten lead chloride, and the flux containing the lead oxide and alkali oxide is skimmed from the resulting lead bismuthide alloy. The lead of the alloy can, if desired, be separated to recover elemental bismuth, for example, by reacting the Pb-Bi alloy in molten droplet or molten particulate form with Cl.sub.2 to form PbCl.sub.2, by electrolysis, or by blowing the molten Pb-Bi alloy with air in a cupel to form litharge which is skimmed off.

REFERENCES:
patent: 2056164 (1936-10-01), Betterton et al.
patent: 2133327 (1938-10-01), Jollivet
patent: 2204651 (1940-06-01), Betterton et al.
patent: 2213197 (1940-09-01), Betterton et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Process for the recovery of bismuth does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the recovery of bismuth, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the recovery of bismuth will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2296616

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.