US 5,665,290 AGranted

Process for manufacturing brick mouldings

AssigneeSICOWA Verfahrenstechnik fur Baustoffe GmbH & Co. KG

InventorsThomas Koslowski, Thomas Fandel

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Abstract

The invention relates to a process for manufacturing brickworks mouldings by mixing a compound containing a granular clay-containing material with a lean material and, if required, other additives from which moulding compound green products are moulded, dried and burnt. This process permits a recycling of residual materials by using as clay-containing material a residual material consisting predominantly of clay minerals, especially a dry fraction, predominantly composed of annealed clay minerals, of an ash, preferably brown coal ash, and by producing the moulding compound by mixing the fraction with the lean material and other additives as well as water, where water is used in such a quantity as to produce an earth-moist moulding compound which is then pressed in portions on a press to form individual, inherently stable green products.

Claims14

Dependent claims

A method for manufacturing bricktype mouldings comprising the steps of:

preparing a moulding compound from a mixture consisting essentially of an enriched annealed clay minerals material, containing pozzuolanic components and lime, derived as a fraction from ash, with particle sizes less than about 300 .mu.m, a filler material and water to provide about 5 to 7% by weight moisture so that the moulding compound has an earthy moisture content;
moulding said moulding compound to produce individual, inherently stable green products by compression moulding at a pressure of approximately 15 N/mm.sup.2 to 20 N/mm.sup.2 ;
drying said moulded green products;
and
firing said dried green products;
wherein the pozzuolanic components and lime are present in the ash fraction in a quantity sufficient to enable reaction products of the lime with the pozzuolanic components to develop during drying to maintain the stability of the molded green products, absent moisture, during firing.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/272,517Filed 11 Jul 1994 · continuation
Priority: DE 41 39 642.12 Dec 1991
Granted: 9 Sep 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

C04B 33/1352
Combustion residues, e.g. fly ash, incineration waste: fuel ashes, e.g. fly ash
C04B 33/13
Preparing or treating the raw materials individually or as batches: compounding ingredients
C04B 33/132
Compounding ingredients: waste materials; Refuse ; Residues
C04B 33/1321
Waste materials; Refuse ; Residues: waste slurries, e.g. harbour sludge, industrial muds