| 摘要 |
An improved process for the selective flocculation of impurities from clays is disclosed. The process comprises blunging the clay in the presence of dispersing agents, conditioning the blunged clay with aliphatic or aromatic hydroxamic acids, or salts thereof, flocculating the impurities with a high molecular weight polymeric flocculant, particularly polymers containing hydroxamate groups, and removing the flocculated impurities from the unflocculated clay. The use of hydroxamic conditioning agents improves the removal of impurities from the clay, thereby providing a clay product having high brightness and low level impurities. The hydroxamic acid conditioning agents may advantageously be used in combination with other conditioning additives and with a wide variety of polymeric flocculating agents.
|
