| 摘要 |
Process for purifying raw solid chemical substances obtained, e.g., by crystallization from the melt, based on the general technique known as sweating (i.e., partial melting with simultaneous purification) and, in particular, on dry-sweating, wherein the chemical product to be purified, in divided form, is treated in a centrifuge having a basket permeable to melt material only, while a hot inert gas is fed at the same time in said basket, the gas having a temperature and a flow rate sufficient to achieve the desired sweating. At the end of the treatment, the purified solid product is recovered from the basket, while the melt product containing a higher concentration of impurities is collected in the external container of the centrifuge. |
