C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/173
C22B 47/00 (2006.01) C01G 45/02 (2006.01)
Patent
CA 1112051
ABSTRACT: Metal Recovery The present invention relates to a process for the recovery of manganese from aqueous acidic solution. The process comprises the steps of,(a) introducing into the solution peroxymonosulphuric acid (PMS) in a plurality of stages, normally from 2 to 6, often in the range of from 110 to 160% of the amount theoretically needed to oxidise the manganese to the Mn (IV) oxidation state, (b) introducing from 100 to 133% of the theoretical amount of neutralising agent to neutralise the PMS introduced in step (a), preferably in a single addition and prior to the introduction of the second stages of PMS and, (c) separating precipitated manganese salt from solution. The demanganisation reaction is preferably carried out at a temperature of above 60°C usually in the range of 70 to 90°C. An aqueous acidic manganese-containing solution can be obtained by leaching ores or scrap metal with strong mineral acids. The present invention is particularly suitable for the purification of zinc sulphate solution.
310976
Burkin Alfred R.
Chouzadjian Kevork A.
George H. Riches And Associates
Interox Chemicals Limited
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