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    "description": "A new process is described for purifying metals by fractional solidification. The process comprises isothermal compression of solute-rich interdendritic liquid from semi-solid starting material. Purification is measured by \u201crefining ratio\u201d, \u00afCc/Co (where \u00afCc is wt pct solute of the refined \u201ccake\u201d and Co is initial pct solute). Refining ratio depends on partition ratio,K, initial fraction solid, amount of liquid retained in the \u201ccake\u201d, and extent of diffusion in the solid. For intermediate fractions solid and low retained liquid, \u00afCc/Co\u2248 k. Refining experiments were conducted on Sn-Pb alloys. Semi-solid samples were isothermally compressed against a filter under controlled strain to pressures up to 21 MPa (2900 psi). The pct solute of the liquid squeezed from the sample was that given by the liquidus curve of the phase diagram. The amount of liquid removed depended on fraction liquid initially present and applied pressure, and not on plunger speed in the range of 10\u22123 to 10\u22121f cmJ.s. At 21 MPa (2900 psi) and fractions solid up to 0.7, over 95 pct of the interdendritic liquid present was removed so that fraction liquid in the final \u201ccake\u201d (\u201ccake wetness\u201d) was reduced to about 0.04. Refining ratios within 80 pct of the theoretical minimum were obtained. Refining ratios obtained ranged from 0.1 at 0.08 to 0.4 at 0.8 fraction solid.", 
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