The mixture for the manufacture of refractories with an irregular grain structure

 

(57) Abstract:

The invention: the invention relates to the technology of refractories that can be used in ferrous and nonferrous metallurgy, glass, chemical and other industries. The mixture for the manufacture of refractories with an irregular grain structure that includes 40-60% granular mellitusdisease filler fractions of more than 0.5 mm, and the rest - it aluminosilicate and zirconite components of fraction less than 0.09 mm in the form of a mixture of a joint grinding, the mixture of a joint grinding has the following composition, %: mellitusdisease filler - 40-70, fire clay or kaolin - 20-30, zirconium dioxide - the rest (but not less than 10), and the ratio of free SiO2/ZrO2= 0,7-0,5. The cooked mass is pressed and calcined at a temperature of 1400-1500oC. 1 table.

The invention relates to the technology of refractories that can be used in ferrous and nonferrous metallurgy, glass, chemical and other industries.

Known mixture for the manufacture of refractories used in continuous casting of steel containing refractory clay, chamotte, obessilennyj zircon, in the following ratio, megatonne on the basis of this charge are much more linear shrinkage and low high-temperature strength due to the presence of a large number of glass rim and the lack of direct links between the crystals.

Known composition for the manufacture of refractory products [2] containing clay, refractory clay and additives (zirconium dioxide), in the following ratio, wt. fireclay 45-70; fire clay 15-30; addition of 10-40. Given the charge has the same drawbacks as the charge [1]

Closest to the proposed charge on a set of attributes [3, prototype] is a composition for the manufacture of refractory articles comprising 35-45% granular mulitlateral filler (clay) fractions up to 3 mm and the rest is fine-grained refractory bunch of particles less than 0,088 mm In the composition of the refractory chords come in, wt.

Mulitlateral filler (clay) 15 50

Refractory clay 25 30

Zirconium oxide containing 5-30% Zirconia 20 - 60.

The shortcoming of the above mixture is continuous grain composition: grain filler fraction 3-0 mm, fine-grained refractory ligament fraction 0-0,088 mm Continuous grain structure makes the seal press powders in forming due to the presence of medium fraction 0,088-0.5 mm, which impede the convergence of the coarse grains of the filler and the distribution between fine-grained bundles. Consequently deteriorate such display is s, in comparison with the prototype, eliminates the inherent disadvantages: high porosity and low strength. This result is achieved by the fact that in the charge for the manufacture of refractories with discontinuous grain composition contains (wt.): 40-60% granular mulitlateral filler fraction > 0.5 mm, and the rest of it aluminosilicate and zirconite components fraction < 0.09 mm in the form of a mixture of a joint grinding, the mixture of a joint grinding has the following composition:

Mulitlateral filler 40 70

Refractory clay or kaolin 20 30

The Zirconia else

(but not less than 10)

and the ratio of free SiO2/ZrO20,7 0,5.

An example of a mixture for the manufacture of refractories with an irregular grain structure.

Mullitokorundovye the clay fraction 3-0,5 mm 50% hydrate the clay slurry (density not less than 1.2 g/cm3), mix and add the mixture of a joint grinding composition, wt. mullitokorundovye fireclay - 58, kaolin 25, Zirconia 17.

With this composition of the mixture components of a joint grinding ratio of SiO2/ZrO20,6 (SiO2unrelated to the mullite).

Mix joint grinding produced in the same SiO2in zircon, is calculated as follows: kaolin contains, in wt. Al2O340, SiO256. In a mixture of a joint grinding: 400,25= 10% Al2O3, 560,25=14% SiO2. Part of SiO2will go to the formation of mullite. The ratio of the mullite Al2O3/SiO22,55 SiO210/2,55 to 3.92% Remains unbound SiO214 3,93 10,08% For binding such quantity of SiO2in zircon at a ratio of SiO2/ZrO20,5 need 10,08/0,5 20,16% ZrO2but to create direct links between crystals of mullite and zircon, you must associate the zircon at least 70% unrelated SiO2for this purpose it is necessary 20,160,7 14,11% ZrO2. Therefore, in this example, ZrO2taken in sufficient quantities to create in the refractories direct links between crystals of mullite and zircon, and the ratio of free SiO2/ZrO20,6.

The table presents the source components for different compositions of the mixture and the properties of the samples.

Calcined product at a temperature of 1400 to 1500oC.

The mixture for the manufacture of refractories with an irregular grain structure that includes granular mulitlateral filler fractions of more than 0.5 mm and fine-grained refractory component, characterized in that the bundle contains refractory clay or kaolin in the following ratio, wt.

Mulitlateral filler 40 70

Refractory clay or kaolin 20 30

The Zirconia Else ( but not less than 10)

when the ratio of free SiO2/ZrO2of 0.5 to 0.7, and the ratio of components in the mixture the following, wt.

Granular mulitlateral filler fractions of more than 0.5 mm 40 60

A bunch of the specified structure Ostalnoe

 

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