The heating and fusion of materials by electron bombardment has been studied for over half a century. Only recently have attempts been made to utilize the extremely high power densities of electron beam systems on an industrial scale. This thesis discusses the usefulness of electron beam melting in the refining of metals. A particular process for treating arc melted zirconium ingots is described in detail. The objective of the research is to contribute to the growth of electron beam melting technology by developing a process of immediate practical importance.