| Process for making acid activated bleaching earth
using high susceptibility source clay and novel bleaching earth
product
A process for making acid-activated bleaching earth from a crude
attapulgite clay. A crude is selected which is mildly acidic and
contains at least about 90% attapulgite. The process involves treating
such clay with low levels of activating acid which are mixed with
the dried and ground clay, or spray dried from slurries containing
the clay-acid mixture. Advantages include: lower acid costs/unit
mass of clay treated, lower production costs (no washing, filtering,
or waste treatment steps) and environmental soundness (no harmful
environmental waste products are produced). |