The invention provides a process for stabilizing plaster and an apparatus
for implementing the moistening part of the process. The process
comprises the following steps: a) providing a heated HH-plaster
preferably at temperatures over 100.degree. C.; b) feeding the hot
plaster in a moistening device having walls heated to at least
100.degree. C.; c) injecting water and/or steam into the moistening
device in conditions that such not yet moistened surfaces of the plaster
are exposed to the injected water and/or steam; d) maintaining an
atmosphere in the moistening device at a level of the dew point in the
range of 75 to 99.degree. C.; e) feeding the moistened blend into a
curing device; f) maintaining an atmosphere in the curing device above
75.degree. C. for at least 3 minutes; g) feeding the moistened and cured
blend into a drying device; and h) drying said moistened and cured blend.
The invention also provides an apparatus for moistening .beta.-hemihydrate
plaster comprising a rotating drum with lifting blades inside where all
walls in contact with the product are externally heated at a temperature
above 100.degree. C.
The invention finally provides specific uses for plasters obtainable by
the process of the invention.