REFINING METHOD FOR REMOVING RESIDUAL LEAD AND THE LIKE FROM RECYCLED (REGENERATED) LEAD-FREE SOLDER (SOLDER CONTAINING TIN AS MAIN COMPONENT AND NO LEAD)

摘要

PPROBLEM TO BE SOLVED: To provide a refining method for removing lead from tin with which a lead-free solder can be recycled by disolving such problem that the mixture of the lead into the lead-free solder can not avoided in many case, because ordinarily the lead solder and the lead-free solder are used in the same site in manufacturing and using when the lead-free solder (the tin is the main component) is recycled. PSOLUTION: The recycling lead-free solder material made into small blocks is charged into a rotating drum opening small holes, and in the case of slowly rotating the drum while keeping the inner part of the drum to a little lower temperature than the melting point of the recycling lead-free solder material, since the tin is made to brittle, the tin is cracked to form the cracked tin. Then, the lead, etc., can be separated and removed by making flow-down the lead (183C melting point), etc., forming an eutectic material with the tin from the small holes. PCOPYRIGHT: (C)2003,JPO