Vereinigte Aluminium-werke Aktiengesellschaft

Metallgesellschaft Aktiengesellschaft

Vereinigte Aluminum-werke Aktiengesellschaft

A.i.r. Lippewerk Recycling Gmbh

Hubert Bings

Roland Thome

Hartmut Pietsch

Wolfgang Turke

Fritz Kampf

Dieter Moritz

Jorg Kruger

Herbert Losert

Hans Obermaier

Peter Fischer

Gunter Winkhaus

Ernst Bareuther

Gerhard Wargalla

Diethel M Koehnk

Karl-Josef Memmel

Disclosed herein is a method for producing plasters that contain chloride contents of less than 0.5% by weight from calcium-containing impure products or residues having a high chloride content (e.g., about 10% or higher based on the total product or residue weight). The method does not require the addition of fly ash, SiO.sub.2 or Al.sub.2 O.sub.3. The method comprises temperature and water-mediated conversion of calcium chloride to calcium oxide in the calcium-containing product or residue using water, steam and/or substances that generate water to obtain calcium oxide and hydrochloric acid; and sulfating calcium components in the product or residue using oxygen and sulfur-containing, largely calcium-free substances. The product so obtained is an anhydride plaster which can optionally be hydrated.

Method for the preparation of low-chloride plaster products from

A process of leaching ores, ore concentrates, intermediate metallurgical products and the like, which contain acid-soluble constituents, by a treatment in an acid aqueous solution under pressure in a tubular reactor. The slurry contains suitably 300 to 1100 g starting material per liter of water and a velocity of flow of 0.5 to 4.0 m/sec. is suitably maintained throughout the flow path in the tubular reactor of the slurry and of the leached suspension.

Method of pressure leaching

Gold and/or silver is leached from comminuted ore with an alkaline cyanide lixiviant at a superatmospheric pressure of at least 25 bar and with high purity oxygen (at least 90% pure) to reduce the residence time at high yield.

Method of extracting gold and silver from an ore

A process for extracting hydrogen fluoride from fluorine containing materials includes countercurrently contacting the materials with steam having a plane of rotation relatively perpendicular to the direction of flow of the material. An apparatus for the extraction of hydrogen fluoride from fluorine containing materials includes a rotary kiln having a first zone wherein a steam-air mixture countercurrently contacts the materials in an oxidation step, a second zone wherein an oxygen containing gas is tangentially injected into the kiln to provide complete combustion of carbon containing materials, a third zone wherein a steam stream countercurrently contacts the materials in a reducing step and means for providing a plane of rotation to the steam which is relatively perpendicular to the direction of flow of the material.

Rotating apparatus for manufacturing hydrogen fluoride

A method for continuously extracting uranium from ores comprises the steps of forming a slurry of ore in a leaching solution; heating the slurry while pumping it through a tube reactor at high turbulences characterized by Reynolds numbers in excess of 50,000; supplying gaseous oxygen at high pressures of at least 30 bar into the tube reactor such that the uranium is substantially completely oxidized in a soluble form but impurities in the slurry are substantially kept from becoming soluble; recovering the uranium oxide solute which is substantially free of impurities.

Method for extraction of uranium from ores

Disclosed herein are a process and apparatus for manufacturing vanadium pentoxide in powder form by the thermal decomposition of ammonium metavanadate containing more than 10% NH.sub.3 in a single operation.

Apparatus for manufacturing vanadium pentoxide

Process for producing hydrogen fluoride from fluorine containing

Process and equipment for manufacturing vanadium pentoxide

Growing community of inventors

Lunen, Germany

Hubert Bings