MAGNESIUM REMOVAL FROM ALUMINUM ALLOY SCRAP

• US 3,620,716 A
• Filed: 05/27/1969
• Issued: 11/16/1971
• Est. Priority Date: 05/27/1969
• Status: Expired due to Term

• Current Assignee: Paul D. Hess
• Original Assignee: Paul D. Hess
• Inventors: Paul, D. Hess
• Primary Examiner(s): L. Dewayne Rutledge
• Assistant Examiner(s): J. Davis
• Application Number:
  US04/828,338
• Time in Patent Office: 903 Days
• Field of Search: 75/68,93,94,63
• US Class Current: 75/685
• CPC Class Codes: C22B 21/062 using salt or fluxing agents C22B21/064, C22B21/066, and C22B21/068 take precedence
• CPC Class Codes: C22C 1/026 Alloys based on aluminium

Abstract

Magnesium can be removed from secondary aluminum by contacting the melted metal with an effective amount of a flux containing potassium aluminum fluoride. This flux offers cost advantages over the known aluminum fluoride flux.

Claims

2. said flux contains at least 50 percent potassium aluminum fluoride,

3. thereafter separating said skim layer from said molten body.

4. said flux is applied in an amount of from 5 to 6 1/2 pounds flux per pound of magnesium in said melt, and

5. said flux is maintained in contact with said molten body for a period of from 3 to 6 hours while said molten body and said flux are stirred together periodically at intervals not exceeding a half hour.