| 摘要 |
A mixture of low melting particles and high melting particles is heated to a temperature above the melting point of the low melting particles and below the melting point of the high melting particles thereby melting the low melting particles and forming a bond between the low melting particles and the high melting particles which bond is strengthened on cooling, the resulting agglomerate containing the low melting particles being separated from the unbonded high melting particles.
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