EP 1235942 A1 20020904 - NICKEL POWDER DESULFURISATION
Title (en)
NICKEL POWDER DESULFURISATION
Title (de)
ENTSCHWEFELUNG VON NICKELPULVER
Title (fr)
DESULFURATION DE POUDRE DE NICKEL
Publication
Application
Priority
- AU 0001318 W 20001027
- AU PQ375499 A 19991029
Abstract (en)
[origin: WO0132945A1] A process and apparatus for desulfurisation of nickel powder is disclosed in which the nickel powder is heated in a hydrogen-containing atmosphere to promote the formation of hydrogen sulfide gas. The hydrogen sulfide gas is then removed using a desulfurisation agent. Hydrogen gas is used as a transfer agent to transport the sulfur from the nickel powder to a suitable desulfurisation agent. In this way the sulfur content of the nickel powder can be substantially reduced. The apparatus (30) includes a rotary kiln (32) in which the off-gases are recycled back into the kiln via an adsorbent H>2<S filter (34). The nickel powder is fed to the rotary kiln (32) via a nickel powder feed hopper (35) which pre-heats the powder prior to entry into the kiln. The kiln is indirectly heated using natural gas. A gas blower (36) maintains a flow of hydrogen containing gas through the rotary kiln in a counter-current direction relative to the direction of transport of the nickel powder through the kiln. Filter (34) incorporates a filter membrane made from a suitable non-volatile desulfurising agent such as calcium, magnesium metal or calcium hydroxide which can be periodically replaced as required. The desulfurised nickel powder exits from the rotary kiln (32) via a discharge hopper (42) where some cooling of the nickel powder occurs. From there the desulfurised nickel powder is fed to a hot briquetting machine (44) which presses the powder into small briquettes. A significant improvement in the production of on specification nickel briquettes can be achieved.
IPC 1-7
IPC 8 full level
B22F 1/00 (2006.01); C22B 1/24 (2006.01); C22B 5/12 (2006.01); C22B 9/14 (2006.01); C22B 9/16 (2006.01); C22B 23/06 (2006.01)
CPC (source: EP)
C22B 5/12 (2013.01); C22B 9/16 (2013.01); C22B 23/06 (2013.01)
Designated contracting state (EPC)
AT BE CH DE FI FR LI
DOCDB simple family (publication)
WO 0132945 A1 20010510; AU 1117201 A 20010514; AU PQ375499 A0 19991125; CA 2389342 A1 20010510; EP 1235942 A1 20020904; EP 1235942 A4 20030502; JP 2003514111 A 20030415; NO 20021776 D0 20020416; NO 20021776 L 20020612; ZA 200202801 B 20030226
DOCDB simple family (application)
AU 0001318 W 20001027; AU 1117201 A 20001027; AU PQ375499 A 19991029; CA 2389342 A 20001027; EP 00972449 A 20001027; JP 2001535623 A 20001027; NO 20021776 A 20020416; ZA 200202801 A 20020410