Plastic and nonmetallic article shaping or treating: processes – Formation of solid particulate material directly from molten... – Coated particles
Reexamination Certificate
1999-05-11
2001-05-08
Theisen, Mary Lynn (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Formation of solid particulate material directly from molten...
Coated particles
C264S005000, C264S010000
Reexamination Certificate
active
06228292
ABSTRACT:
INTRODUCTION AND BACKGROUND
The present invention relates to a process for the preparation of pulverulent heterogeneous substances.
It is known to prepare pulverulent heterogeneous substances from oxides and salts starting from a suspension, dispersion or emulsion.
Spray driers or similar apparatus are usually employed for the drying of suspensions, dispersions or emulsions. This is followed by a rotary tube or equivalent apparatus for calcining. With such prior known methods the losses of powder by cleaning and handling, and also during operation of the plant are or can be considerable; also the labor costs can be high.
Drying and calcining in batches (for example in vessels in a muffle furnace) can be used as an alternative. However, there is the risk with such apparatus of a very wide range of product quality due to diffusion processes and temperature gradients in the powder.
It is therefore an object of the present invention to prepare pulverulent heterogeneous substances and to overcome the disadvantages of prior known methods.
SUMMARY OF THE INVENTION
The above and other objects can be achieved according to the present invention by introducing a dispersion, suspension or emulsion into a turbulent or laminar burner. This dispersion, suspension or emulsion is then treated there under the conditions established therein to produce a reaction mixture. The resulting reaction mixture is then introduced into a downstream flow-through tube, where the powder is further treated. The powder is subsequently fed, optionally, to a washer, a separator or a filter, and, optionally, subjected to a further treatment there. Subsequently, the pulverulent product can be transported further via any appropriate device.
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Domesle Rainer
Foerster Martin
Gutsch Andreas
Kiessling Ralph
Stöhr Oliver
Degussa - AG
Smith , Gambrell & Russell, LLP
Theisen Mary Lynn
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