Abstract
Method for lead removal from molten brass was investigated to reduce the concentration of lead in scrap brass. Granular Ca-Si compound was added to the molten brass to form large Ca-Pb-Si compounds. The Ca-Pb-Si compounds were then skimmed off from the molten brass. After casting into a metal mold, the brass ingot was characterized by EPMA and fluorescence X-ray analysis. The effects of grain size of Ca-Si compound, the method of adding Ca-Si compound, agitation time, holding time after agitation and compound removal temperature on the percentage of lead removal were discussed. It was confirmed based on the results that the compound method that uses granular Ca-Si compound to form Ca-Pb-Si compounds which are skimmed off from the molten metal enables the reduction of lead concentration.
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