SU1701698A1 - Mass for making ceramic tiles - Google Patents

Abstract

The invention relates to compositions of ceramic masses and can be used for the manufacture of ceramic tiles by high-speed technology with firing on flow-conveyor lines with slot-hole roller furnaces. In order to increase the heat resistance and reduce the firing temperature, the ceramic mass contains the following components, wt%: clay 50-59.5; silica sand 0.5-20; hornblendite 30-40. The physical and mechanical properties of the tiles are as follows; water absorption 14.3-17%, moisture expansion 0.01-0.04%, flexural strength 21.8-27.6 MPa, roasting temperature 900-950 ° C, shrinkage 0.5-0.6 %, heat resistance according to Harcourt in the temperature range 200-20 ° C. 2 tab.

Description

The invention relates to compositions of ceramic masses and can be used for the manufacture of ceramic tiles by high-speed technology with firing on flow-conveyor lines with slot-hole roller furnaces.

Ceramic mass is known, including clay, quartz sand, dolomite, broken glass and tiled combat,

The disadvantage of this mass is an increased calcination temperature, a reduced temperature coefficient of linear expansion (TCLE).

Closest to the proposed is a mass, including, wt.%:

Clay45-60

Quartz sand 21-25

Tremolite15-25

Tile battle2-8

The disadvantages of this mass are increased calcining temperature and low heat resistance.

The purpose of the invention is to increase the heat resistance, lowering the firing temperature. Ceramic mass, including clay, quartz sand, additionally contains hornblendite in the following ratio, wt.%:

Clay50-59,5

Quartz sand0,5-20

Hornblendite30-40

The use of waste-screenings in the ceramic masses from the magnetic separation of ore hornblendites makes it possible to intensify the sintering process at lower temperatures and to obtain a durable shard with high physicomechanical indicators. In addition, the application is given

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This waste material allows to obtain products with high heat resistance and low values of humidity expansion, which makes it possible to provide resistance to the tiles during operation.

Hornblendite screenings are waste at the final stage of the production of magnetic separation of mining oreblenites. The chemical composition of hornblendite screenings-waste,%: SS02 36.4 ± 1.0; TI02 1.9 ± 0.5; H5.0 ± 1.0; ReaOz 8,2 ± 0,5; FeO 10.0 ± 0.5; MoO 14.5 ± 1.0; CaO 10.9 ± 0.5; NaaO 1.75 + 0.05; K20 0.35 ± 0.05; MpO - not more than 0.1; PaOs - no more than 0.07; 80.8 thousandths of%, The mineralogical composition of mountain-blendite wastes is represented by hornblende ordinary (about 75%), corrosive bitovnite-anortite (about 15%), ore minerals not more than 5%, chlorite (about 5%) and diopside- hedenbergite (about 5%).

These wastes have a particle size of not more than 10 mm in diameter and are represented by the following particle size distribution; particles less than 1 mm - 30%, 1-6 mm - 40%, 6-10 mm-30%. The use of gornblendite in the compositions of the masses does not increase the time of their grinding. The stockpile of this waste is 1-2 million tonnes F year. The cost of the material does not exceed 2 rubles. per ton. The use of such masses is advantageous and technically expedient.

The mass is prepared by the slip method in a ball mill. Non-plastic materials are ground to a residue on a control sieve No. 0063 2-4%. The final grinding is performed until the residue on sieve No. 0063 is 1-2%.

Drying of the slip is done in a tower spray dryer. The moisture content of the press powder is 5-7%.

Tiles are pressed on presses, accepted in production (KRKp-125, RU-500, etc.). The pressed single layer tiles are dried for 9 minutes to a moisture content of not more than 0.5% at a maximum temperature of 250-300 ° C and then fired in a gas roller furnace at 900-950 ° C for 17 minutes.

The compositions of the proposed masses are given in Table 1, and in Table 2, the properties of products based on them.

Claims (1)

Claim of the invention Mass for the manufacture of ceramic tiles, including clay and quartz sand, characterized in that, in order to increase the heat resistance, reduce the firing temperature, it additionally contains gornbendit in the following ratio, wt.%: Clay50-59,5 Quartz sand0,5-20 Hornblendite30-40 Table 1 Table 2