Outotec Oyj

Outotec (finland) Oy

Metso Metals Oy

Edgar Gasafi

Michael Missalla

Andreas Orth

Jean-Paul Nepper

Jean Claude Hein

Bertold Stegemann

Bernd Reeb

Katja Dombrowski-Daube

Andrew Adipuri

A method for the heat treatment of granular solids includes initially introducing solids into a first reactor configured as a flash reactor or fluidized bed reactor where they are brought into contact with hot gases at temperatures in the range 500&#xb0; C. to 1500&#xb0; C. Next, the solids are passed through a residence time reactor in which they are fluidized. The residence time reactor is configured in a manner such that it has various regions which are separated from one another, from which the solid can be withdrawn in a manner such that it is provided with a variety of residence times in the residence time reactor.

Method and device for the heat treatment of granular solids

A process for purifying red mud including reduction of the red mud to reduced material, and traversing the reduced material with an oxygen-containing gas in the presence of a catalyst suitable for iron oxidation.

Process and plant for purifying red mud

A plant for chemical or physical treatment of granular solids includes a fluidized-bed reactor, a solids supply conduit and a central gas supply tube. A cooling tube is disposed relative to the gas supply tube so as to form an annular cooling duct, which is configured to cool the gas supply tube and the process gas and is connected with a coolant source configured to supply a coolant with a temperature of below about 400&#xb0; C. Outlet openings are disposed in the cooling tube. The fluidized-bed reactor is a Venturi reactor in which the cooling tube opens into a flared portion with the outlet openings connecting the annular cooling duct with the reactor interior. The cooling tube adjoins the gas supply tube and extends substantially parallel to the flared portion of the reactor.

Process and plant for the thermal treatment of fine-grained solids

A method for producing a clinker substitute for use in cement production includes predrying clay with an iron content &#x3e;1.5 wt-% in a form of iron oxides and a kaolinite content &#x3c;40 wt-% to a moisture &#x3c;10 wt-%. The clay is comminuted to a grain size &#x3c;2 mm. The clay is calcined by thermal treatment in a furnace at a temperature of 600 to 1000&#xb0; C. The clay is thermally treated under reducing conditions at a temperature of 600 to 1000&#xb0; C. so as to form a reduction product. The reduction product is intermediately cooled to a temperature &#x3c;300&#xb0; C. and finally cooled.

Clinker substitute based on calcined clay

A process for at least one of a chemical and a physical treatment of fluidizable substances in a reactor. The process includes introducing a hot gas into an interior of the reactor through a gas supply tube and cooling at least one of the hot gas and the gas supply tube with a coolant. The cooling is performed by contacting the hot gas with the coolant so as to provide a temperature of a wall of the gas supply tube at least 50&#xb0; C. lower than a temperature of the gas at an inlet of the gas supply tube facing away from the interior of the reactor.

A process for producing a geopolymer includes combusting at least one of oil shale and mineral residues originating from a production of oil using the oil shale so as to produce a combustion product. The combustion product is ground. An alkaline activator is added to the combustion product to form a geopolymer mixture. Water is added to the geopolymer mixture. The geopolymer mixture is adjusted so as to obtain a mol ratio of Si:Al of 2 to 5, a mol ratio of K:Al of 0.6 to 0.7, a mol ratio of Si:K of 3 to 10, a mol ratio of Ca:Al of 0.1 to 0.4, and a mol ratio of Si:CA of 4.9 to 41. The geopolymer mixture is hardened.

Growing community of inventors

Karlsruhe, Germany

Edgar Gasafi