CZ302929B6 - Use of grinding swarfs of conglomerated stone production as an ingredient of clay raw material for brickware, earthenware and similar ceramic products - Google Patents

Abstract

Use of grinding swarfs of conglomerated stone production as an ingredient containing silicon chemicals added to raw material for brickware, earthenware and similar ceramic products, which are processed during their manufacturing by temperatures exceeding 900 degC.

Description

Technical field

The invention relates to the use of abrasive sludge from the manufacture of conglomerated stone as an additive to a clay base material for brick, pottery and the like ceramic products which are processed at temperatures above 900 ° C in the process of their manufacture.

BACKGROUND OF THE INVENTION

In the manufacture of conglomerated stone, commonly called artificial stone, in the phase of its grinding and scaffolding in the presence of water, abrasive sludge is formed. The abrasive sludge contains variously 30 to 50% by weight of water, 75 to 85% of silica in the dry matter, 6 to 10% of organic substances in the dry matter and 2 to 5% of metal salts in the dry matter. The organic matter content of the abrasive sludge is predominantly polymeric resin residues used as a binder for all components of the substrate for the manufacture of conglomerated stone. OuSrtli ívžlcycii metal pencil jc 's ucprcsuHujc pnrozcric pozstíi, JC Icícrc ónnc prcvuzujicim use of natural resources for conglomerated stone manufacturing, and does not exceed 30 mg.kg' ^first

They are separated from the abrasive sludge by, for example, decanting the suspended solid particles followed by filtration on a filter press or other filter device. Thickened abrasive sludge is deposited as so-called other waste in ordinary landfills. However, this entails considerable costs, problems arising from legislation concerning production and waste management.

Ceramic products are made by mixing suitable plastic clays with water, then shaping, drying and firing. Plastic clays are unpaved sedimentary rocks consisting of a mixture of hydrated aluminosilicate minerals whose structure is capable of absorbing large amounts of moles30 of cobalt-bound water.

The choice of natural raw material and the subsequent production process is decisive for the quality and properties of ceramic products. For example, if brick clay made of plastic clays, as a raw material for brick products, contains a lower content of silica and other silicon modifications, this deficit is complemented, for example, by the addition of silicon dioxide either in the form of native amorphous silicates or waterglass, etc. bonding of brick raw material and possibly even easier conversion of heavy metal oxides to insoluble silicates at firing temperatures above 900 ° C.

In addition to these impurities, in the manufacture of brick and other products, various other impurities such as galvanic bath sludge, power plant ash, wood sawdust, waste cellulose, etc., are added to the base material to some extent to improve the resulting structure of the ceramic product. some, otherwise harmful, are subsequently eliminated as part of the firing process.

WO 2005049527 is known for the use of waste materials, which solves the replacement of porous thermo-acoustic insulating materials made so far from thermoplastics, mineral wool or porous material. The document describes the use of wastes from the production of ceramic products, in particular sludges from the cutting of porcelain stoneware for the production of ceramics, as a substitute for the production of said thermo-acoustic insulating materials. The field of treatment and recovery of sewage sludge is remote from the intended aim of the present invention.

- 1 GB 302929 B6

SUMMARY OF THE INVENTION

The object of the invention is to find a way out of the uneconomical treatment of abrasive sludge as waste and to actively exploit its favorable physical and chemical properties in its further secondary treatment with respect to ecology in waste management, this object being achieved by using abrasive sludge from conglomerated stone production. as additives to the base clay raw material for brick, pottery and similar ceramic products, which are processed at temperatures above 900 ° C in the production process.

The use of abrasive sludge in the base clay raw material for the manufacture of brick, pottery and other similar ceramic products is particularly advantageous when natural plastic clays, as the raw material, do not achieve the necessary content of silicon compounds, especially silica necessary for quality final products. The use of abrasive sludge is a source for achieving optimal composition of said basic raw material, especially for elimination of the deficit of said silica etc. Organic substances contained in abrasive sludge during heat treatment of brick, pottery and other ceramic raw materials burn and by their calorific value contribute to heat balance of the firing process .

DETAILED DESCRIPTION OF THE INVENTION

Abrasive sludge is admixed in a mixing device for preparing the base material of plastic clays for ceramic products, for example in a ratio of:

1000 parts by weight of basic clay clay with water up to 60 parts by weight of abrasive sludge, depending on the degree of their concentration.

After homogenization, the base material with the admixture of abrasive sludge and other admixtures is processed by conventional pressing, cutting and other shaping to the desired shapes. Other technological steps, such as drying of the workpiece and its firing, are carried out in the usual way, i.e. after drying at least one firing at temperatures of 900 to 1500 ° C without affecting these processes by grinding sludge, only perhaps by partially participating with other conventional admixtures. , as with wood sawdust etc. on the heat balance of the firing process and subsequent porosity of products, etc.

Optionally, the abrasive sludge also contains doped remnants of the artificial stone substrate scraped off the walls of the production equipment during their regular maintenance.

Claims (1)

PATENT CLAIMS Use of abrasive sludge from the manufacture of conglomerated stone as an additive containing silicon compounds in the raw material for brick, pottery and the like ceramic products which are processed at temperatures above 900 ° C in the production process.