C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/331
C22B 13/02 (2006.01) B03B 9/00 (2006.01)
Patent
CA 1339191
Lead with a low alpha particle emission is produced by selecting an orebody wherein lead mineral is present in a coarsely disseminated form and substantially free of impurities. The ore is selected from a host rock that is relatively low in alpha emitters, such as a carbonate rock. The ore is mined and is mined such that the lead mineral can be separated from the host rock and any other minerals. The ground ore may be screened into one or more fractions having a narrow range of particle sizes. Each fraction is formed into a fluid suspension, and each suspension is subjected to gravity separation to remove the host rock and any other minerals which substantially contain the alpha particle-emmitting substances, and to recover the lead mineral as a concentrate with a low alpha count. The lead concentrate is subjected to a suitable reduction operation that may include a conversion of the concentrate into a reducible form, without the introduction of alpha emitters, for the recovery of a low alpha lead. When the lead mineral is galena, suitable reductions include the smelting with sodium carbonate with or without an oxygen-bearing gas and electrolytic reduction in a molten bath of lead chloride. The low alpha lead recovered from these operations has an alpha count of about 0.02 alpha particle per cm2 per hour or less, and the count does not substantially increase with time. The recovered low alpha lead may be further purified by electro-refining.
576801
Dunlop John A.
Milner Edward F. G.
Smyth Robert W.
Toop Gerald W.
Dunlop John A.
Gowling Lafleur Henderson Llp
Milner Edward F. G.
Smyth Robert W.
Teck Metals Ltd.
LandOfFree
Method for making low alpha count lead does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for making low alpha count lead, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for making low alpha count lead will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1285320