Indium Corporation of America

Charles E White

James A Slattery

Laurence G Stevens

John P Hager

John R Sovinsky

George E Kraeger

Nicholas B Gomez

A low melting point solder alloy comprising effective amounts of tin, silver and indium.

Lead-free alloy containing tin, silver and indium

An alloy composition comprising effective amounts of bismuth, indium, lead, tin, and gallium, which is especially suited for lens blocking.

Fusible alloy containing bismuth, indium, lead, tin and gallium

A low melting point solder alloy comprising effective amounts of tin, zinc and indium.

Lead-free alloy containing tin, zinc and indium

Indium-containing feedstocks, such as flue dusts from a refining or smelting process, are treated to increase the concentration of indium and at the same time to reduce the concentrations of lead, copper, and arsenic. The flue dusts are treated in a sodium-doped lead bath at temperatures of 675.degree. to 800.degree. C. Soda ash in the amount of 15 to 35 weight percent is blended with the feed stock and added to the sodium-doped lead bullion. The sodium reacts with the dusts to form a liquid dross, which is removed, cooled, and crushed. The powdered dross is water leached to remove the sodium salts. The indium remains in the filler cake and can be processed by conventional methods for the recovery of indium. About 95% of the indium reports to the filter cake, while lead retention in the filter cake is only about 5-15% of the initial lead content in the dust. A majority of the zinc also reports to the filter cake. A majority of the lead, copper, and silver report to the bullion, and a majority of the arsenic reports to the filtrate. Sodium consumption is about one pound of sodium for each five to ten pounds of feedstock.

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Clinton, NY, United States of America

Charles E White