Calcining of calcium hydroxide - as moist granules or briquettes using a covering layer of limestone chips

• Main Authors: STENDEL,JOACHIM,.DR, RABOWSKY,HANS,.DR, PORTZ,WILHELM,.DR, WITT,HORST, MUENCH,GOTTFRIED, MOORMANN,GUENTER
• Format: Patent
• Language: English; German
• Published: 01.07.1976
• Edition: 2
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; COMPOUNDS THEREOF; CONCRETE; INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS; INORGANIC CHEMISTRY; LIME, MAGNESIA; METALLURGY; NON-METALLIC ELEMENTS; REFRACTORIES; SLAG; TREATMENT OF NATURAL STONE

In the calcination of mouldings used as reacting mixture components in electro-thermal carbide furnaces and obtained by granulating or briquetting of moist calcium hydroxide, by (a) transporting the mouldings through a heating zone on a belt, high temps. being produced by burning gases above the belt and waste gases being drawn away below the belt, (b) covering the calcium hydroxide mouldings present on the belt with a covering layer and transporting them directly through the heating zone without pre-drying, generally as disclosed in DT 2407506, the improvement whereby the covering material is applied to the calcium hydroxide mouldings in such a way that the surface of the covering layer has a corrugated profile. Solves the problem of non-uniform metering of the covering material particularly limestone chips, which can lead to the suction belt being damaged by exposure to excessively high temperatures. A calcined product of improved quality is obtained with an increase in throughput.