IP Library › Granted Patent US 7,998,241
Granted Patent B2
US 7,998,241 · App. 12/068,093 · Granted Aug 16, 2011

Method for recovering rhodium

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Quick Facts
Patent No.
US 7,998,241
App. No.
12/068,093
Granted
Aug 16, 2011
Kind
B2
Abstract

The present invention provides a method for recovering rhodium sponge in high yield from ammonium hexachloro rhodate solution. The method comprises adding formic acid to ammonium hexachloro rhodate solution to reduce the rhodate, recovering reduced rhodium as rhodium black, and calcining the rhodium black under hydrogen atmosphere without water-washing to obtain rhodium sponge.

Claims (5)

1. A method for recovering rhodium in a yield of 98.7% or higher comprising:

adding formic acid to ammonium hexachloro rhodate solution to reduce the rhodate,

recovering reduced rhodium as rhodium black, and;

calcining the rhodium black under hydrogen atmosphere without water washing to obtain rhodium sponge.

2. The method for recovering rhodium as claimed in claim 1 , wherein the step of calcining the rhodium black is conducted in a tube made of alumina to prevent contamination with iron or the like.

Assignments (3)
CHANGE OF NAME Recorded Oct 19, 2010
From: NIPPON MINING HOLDINGS, INC.
To: JX NIPPON MINING & METALS CORPORATION
Reel/Frame 025163/0049 →
MERGER Recorded Oct 14, 2010
From: NIPPON MINING & METALS CO., LTD.
To: NIPPON MINING HOLDINGS, INC.
Reel/Frame 025140/0159 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 1, 2008
From: USUI, SHOUJIROU; ITO, YOSHIO
To: NIPPON MINING & METALS CO., LTD.
Reel/Frame 020516/0945 →