Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB37195/57A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EI Du Pont de Nemours and CofiledCriticalEI Du Pont de Nemours and Co
Publication of GB831173ApublicationCriticalpatent/GB831173A/en
C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
C22B58/00—Obtaining gallium or indium
Landscapes
Engineering & Computer Science
(AREA)
Chemical & Material Sciences
(AREA)
Manufacturing & Machinery
(AREA)
Materials Engineering
(AREA)
Mechanical Engineering
(AREA)
Metallurgy
(AREA)
Organic Chemistry
(AREA)
Manufacture And Refinement Of Metals
(AREA)
Abstract
The zinc content of indium is reduced (e.g. from 1000 or more to below 50 parts per million) by exposing molten indium to an oxygen-containing atmosphere thereby preferentially oxidizing the zinc, the oxide of which is then removed from the surface of the indium (e.g. by treatment with concentrated hydrochloric or other acid, polishing or abrading). The oxidizing atmosphere may consist of a stream of air or an inert gas containing at least 0.01% of oxygen, and the duration and temperature of the treatment may be up to 9 hours and 250 DEG C. respectively. The preferential oxidation may be performed during a zone-refining treatment or by exposing the molten indium contained in a crucible to the oxygen-containing atmosphere whilst stirring gently.
GB37195/57A1956-11-291957-11-28Improvements in or relating to the purification of metallic indium
ExpiredGB831173A
(en)
Process for restoration of the original conductivity of a copper melt of which the gas-content and conductivity have been reduced by addition of a deoxidant
Process and apparatus for recovering and processing iron containing substances from gas escaping when blowing oxygen or oxygen containing gas into or on to a bath of molten iron