| 摘要 |
Clay is whitened by subjecting a clay slip to a magnetic field of average strength of at least 1500 gauss to separate paramagnetic particles therefrom. The field may be non-homogeneous and up to 15,000 gauss. The clay slip may be deflocculated prior to the separation. The particle size of not more than 10% weight of the clay may be above 10m and up to 80% weight may be less than 2m . At least 90% weight of the clay may have a size greater than 1m . The solids content of the clay slip may be 5 to 20% weight. The separation(s) may be carried out with the slip stationary. The paramagnetic particles may be iron-associated minerals such as tourmaline, mica, felspar, quartz, rutile or ilmenite.
|
