EP 0289434 B1 19911218 - PROCESS FOR THE PREPARATATION OF MASTER ALLOYS OF IRON AND NEODYMIUM BY ELECTROLYSIS OF OXYGEN-CONTAINING SALTS IN MOLTEN FLUORIDES
Title (en)
PROCESS FOR THE PREPARATATION OF MASTER ALLOYS OF IRON AND NEODYMIUM BY ELECTROLYSIS OF OXYGEN-CONTAINING SALTS IN MOLTEN FLUORIDES
Publication
Application
Priority
FR 8705954 A 19870421
Abstract (en)
[origin: US4828658A] The invention concerns a process for the electrolytic preparation of a mother alloy of iron and neodymium by the reduction of a mixture comprising at least one reactive oxygen-bearing compound of neodymium in a bath of molten halides with at least one metallic cathode, preferably of iron, and a carbon anode. In accordance with the invention, the bath is primarily formed by a mixture of molten fluorides whose decomposition potential is close to that of NdF3 or more negative, such as for example NdF3, MgF2, ScF3, CeF3, LaF3, BaF2, CaF2 and SrF2, and permitting solubilization of the oxides by a complexing effect, the solute to be reduced is formed by a mixture of salts primarily containing a reactive oxygen-bearing compound of neodymium which is very rapidly soluble in the molten electrolyte. The working temperature is in a range of from 640 DEG to 1030 DEG C., the anodic current density is from 0.1 to 1.5 A/cm2, and the cathodic current density is between 2 and 30 A/cm2.
IPC 1-7
IPC 8 full level
CPC (source: EP KR US)
Designated contracting state (EPC)
AT BE CH DE ES GB IT LI NL SE
DOCDB simple family (publication)
EP 0289434 A1 19881102; EP 0289434 B1 19911218; AT E70569 T1 19920115; AU 1478588 A 19881027; BR 8801885 A 19881122; CA 1325194 C 19931214; CN 1040631 A 19900321; DE 3866939 D1 19920130; DK 214188 D0 19880420; ES 2028344 T3 19920701; FR 2614319 A1 19881028; FR 2614319 B1 19890630; JP S63282287 A 19881118; KR 880012798 A 19881129; NO 176190 B 19941107; NO 176190 C 19950215; NO 881703 D0 19880420; NO 881703 L 19881024; SG 39692 G 19920612; US 4828658 A 19890509; ZA 882769 B 19881021
DOCDB simple family (application)
EP 88420124 A 19880419; AT 88420124 T 19880419; AU 1478588 A 19880420; BR 8801885 A 19880420; CA 564553 A 19880420; CN 88102181 A 19880420; DE 3866939 T 19880419; DK 214188 A 19880420; ES 88420124 T 19880419; FR 8705954 A 19870421; JP 9666788 A 19880419; KR 880004509 A 19880421; NO 881703 A 19880420; SG 39692 A 19920410; US 17736588 A 19880404; ZA 882769 A 19880420