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Raw mixture for making facing ceramic tile

IPC classes for russian patent Raw mixture for making facing ceramic tile (RU 2258684):
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FIELD: building industry and materials.

SUBSTANCE: invention relates to manufacturing building ceramics and can be used in making facing tiles. The raw mixture for making facing ceramic tile comprises carbon enrichment rock treated at 570-600°C, clay and slurry fraction in enrichment waste of iron ores as a fusing agent that comprises the following components, wt.-%: SiO2, 42.45; Al2O3, 14.54; CaO, 14.88; MgO, 4.52; FeO, 8.06; Fe2O3, 9.46; SO3, 0.98; R2O, 3.25; MnO, 0.49; TiO2, 0.73, and P2O5, 0,64 in the following ratio of components, wt.-%: carbon enrichment rock treated at 570-600°C, 70-90; clay, 5-20, and slurry fraction in iron ores enrichment, 5-10. Invention provides reducing shrinkage deformations, water absorption of tile and energy consumption in its manufacturing.

EFFECT: valuable technical properties of raw mixture.

2 tbl

 

The invention relates to the production of building ceramics and can be used in the manufacture of tiles.

Famous raw mixture of ceramics for the manufacture of tiles [1], containing the following components, wt%:

Clay refractory 30-40
Sand quartz 2-10
Glass 27-33
Nepheline concentrate 5-13
Rock cast, heat-treated at 900-1000° 10-30

The disadvantage of the composition of the ceramic material is its complexity, which complicates the manufacturing process of tiles, in addition, there is an increased flow of flux that increases of shrinkage and water absorption.

Closest to the invention is a raw material mixture to obtain a ceramic mixture, [2] includes the following components, wt%:

Rock cast, heat-treated at 900-1000° 50-92
Clay 5-35
Alkaline flux 3-40

The disadvantage of the raw mix is the increased volume of the Naya shrinkage, water absorption, large energy costs associated with the preparation of the breed coal at a temperature of 900-1000°C. in Addition, the prep is slip method with subsequent dehydration, which also increases the energy consumption.

The objective of the invention is the reduction of shrinkage deformation, the water absorption of the tile, energy consumption during its production.

The essence of the invention lies in the fact that the raw mix for the production of ceramic tiles contains the type of coal, heat at 570-600°C, clay, and as smoothly silt portion of the tailings of iron ore in the following ratio, wt.%:

Rock cast, heat-treated at 570-600° 90-70
Clay 5-20

The sludge of the waste beneficiation of iron ore 5-10, while the chemical composition of the sludge part tailings of iron ore, wt.%: SiO2- ΓΈ 42.45; Al2O3- 14,54; CaO - 14,88; MgO - To 4.52; FeO - 8,06; Fe2O3- 9,46; SO3- 0,98; R2O - 3,25; MnO - 0,49; TiO2- 0,73; P2About5- 0,64.

Breed coal have the following chemical composition, wt.%: SiO2- 68.75 kilopascals; CaO - 0,96; MgO - 0,52; Al2O3- 22,23; FeO - 4,63; Fe2About3at 0.42; SO3- 1,03; R2O - 0,71; P2O5- 075.

Feature heat-breed coal is that it is pre-fired at 570-600°it allows you to activate the clay component in contrast to firing it at 1000°where the clay part becomes inert. At a temperature of 570-600°end polymorphic transformation of quartz, which lead to structural deformations, such as increasing the volume and water absorption.

The sludge of the waste beneficiation of iron ores performs as a role smoothly, and the role of structuring additive, which improves the strength of the fragment.

The material composition of the sludge part tailings of iron ore the following: clay substance (in the form of smarandachely clay minerals), ore impurities, field sodium and potassium feldspars (which acts as a flux), the sandstones.

The mineralogical composition of the sludge part tailings of iron ore, %:

Chlorite (including iron ore, class of layered silicates) 50-60
Carbonates (calcite) 18-20
Quartz, feldspars 7-15
Biotite 5-7
Clay substance 10-11

The mixture is prepared as follows.

Unfired breed pleabargain the fraction of more than 20 mm, crushed to powder (less than 0.6 mm). Grinding unfired breed requires much less energy than burned. The powder is subjected to heat treatment at a temperature of 570-600°C. Then calcined powder add the sludge of the waste beneficiation of iron ore in the amount of 5...10%, enter clay 5...20% and add water to a moisture content of mixture 8...10% and mix thoroughly.

From the resulting powder is pressed tiles (pressure 25-35 MPa). Heat treatment and glazing is carried out according to the traditional technology.

Table 1 shows the compositions of the raw material mixtures, and in table 2 - physical and mechanical properties of products.

Table 1
Component Content, wt. %
The proposed composition Known composition
1 2 3
Burnt rock coal 70 78 90 50-90
Clay 20 15 5 5-35
Alkaline flux - - - 3-40
Tailings of iron ore 10 7 5 -
Table 2
Properties Indicators for composition
The proposed composition Known composition
1 2 3
Compressive strength, MPa 17 18 15 12
Water absorption, % 10,5 the 10.1 11,5 12
Total shrinkage, % 3,3 2,5 2,3 4,1

Sources of information

1. USSR author's certificate No. 768783, 04 33/00, 1980.

2. USSR author's certificate No. 1033476, 04 33/00, 1983.

Raw mix for the production of facing ceramic tiles, including the type of coal, clay and flux, characterized in that as the main component, it contains the type of coal, heat at 570-600°and as smoothly silt portion of the tailings of iron ore, chemical composition, which composition, wt.%: SiO2-42,45; Al2O3-14,54; CaO-14,88; MgO-To 4.52; FeO-8,06; Fe2About3-9,46; SO3-0,98; R2On-3,25; MnO-0,49; TiO2-0,73; P2About5-0,64, in the following ratio, wt.%:

Rock cast, heat-treated at 570-600°
90-70
Clay 5-20
The sludge of the waste beneficiation of iron ore 5-10

 

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