Degussa Aktiengesellschaft

Herbert Riemenschneider

Roland Schaffer

Josef Leutner

Christian Alt

Martina Claus

Martin Foerster

Guenther Michael

Claas-Jurgen Klasen

Ruediger Schuette

Juergen Loroesch

Stefan Schulze

Thomas P Riedemann

Andreas Hofler

Gerd Theodor Brand

Jurgen Lorosch

Andreas Ernst

Hans-Juergen Strempel

Klaus W Rolf

Richard F Cavagnaro

Oliver Franta

Heinz Moench

Klaus-Peter Bauer

Rainer Gilg

Heinz Monch

New alkali metal cyanide granulates based on sodium cyanide or potassium cyanide and a method for their preparation are disclosed. Commercially available alkali metal cyanide granulates consist of irregular particles; disadvantages are in particular the tendencies to form dust and to cake. The disclosed alkali metal cyanide granulates demonstrate a reduced tendency to cake and virtually no abrasion. The granulates are characterized by essentially spherical particles with particle diameters in the range 0.1 to 20 mm, a bulk density of more than 600 g/dm.sup.3, an abrasion of less than 1%, and a caking index of at most 4. The granulates can be prepared by fluidized bed spray granulation involving spraying an aqueous solution containing alkali metal cyanide onto alkali metal cyanide nuclei in a fluidized bed and evaporating the water.

Process for preparation of alkali metal cyanide granulates

An apparatus and method for dispensing fine particle material from a container such as a flexible intermediate bulk container. The invention includes a dispensing assembly that has a dispensing device that is secured to an outlet tube of the container. Securement is achieved by a strap member wrapped about the container's outlet tube and a clamping casing and/or by an inflatable member that expands outward from the clamping casing. The casing surrounds a transport tube which is axially shiftable following securement of the clamping casing to the outlet tube. A head piece with gas cavity and radial and oblique extending ports is provided at the end of the transport tube. The dispensing device is inserted into the outlet tube below a blocking member provided at the base of the outlet tube. Following attachment of the outlet tube to the clamping casing, the blocking member is released. The transport tube is then released from a first position, shifted and then fixed in a second position. The second position places the head of the dispensing device into the main compartment of the container and above the released blocking member. At this location gas, is injected through the ports and product is drawn out through the interior of the transport tube. In an alternate embodiment, there is used, either alone or in combination with the headpiece, an injection branch for directing a jet of air down the central axis of the transport tube. In another embodiment, a constricted member having a venturi configuration is provided in the same area within the transport tube as the outlet of the injection branch.

Method and apparatus for dispensing particles from a container

Granulated alkali metal cyanide

A method for the production of spherical granulated materials from powdered solids and the granulated materials produced by it are disclosed. The method is characterized in that the powdered solids are moistened, possibly together with the usual binders, flow agents and plasticizers for the compression of solids, by the addition of a corresponding quantity of liquid and mixing smoothly in a mixer; they are then compressed with a ring collar mill into cylindrical agglomerate and then rounded in a rounding unit with wrinkle washer. The granulated solids thus produced have a very narrow particle size distribution and are distinguished by good flowability and good dispersability, depending on process controls.

Method for producing spherical granulated materials from powered solids

A tube device for emptying powdery substance from a container in which an air connection pipe is arranged. The air exit opening of the air connection pipe is located coaxially to the tube in the direction of the interior of the tube. The opening of the tube is cut open on a slant to form an angle of less than 90.degree. with the horizontal axis of the pipe.

Device for emptying powdery substances from containers

Growing community of inventors

Gelnhausen, Germany

Herbert Riemenschneider