RU2281926C2 - Ceramic mixture for manufacturing acidproof products - Google Patents

Abstract

FIELD: ceramics.

SUBSTANCE: ceramic mixture is characterized by containing, wt %: clayey part of zircon-ilmenite ore gravitation tails 15-40, pyrophyllite 45-60, feldspar concentrate 5-10, and bentonite with plasticity index above 40 - 5-15.

EFFECT: increased mechanical strength of acidproof products, extended raw material source, and improved environmental condition due to utilized industrial waste.

2 tbl

Description

The invention relates to the ceramic industry, mainly to the compositions of the masses for the production of acid-resistant.

A ceramic mass is known for producing acid-resistant materials of the following composition, wt.%: The clay part of the “tails” of gravity of zircon-ilmenite ores - 50, pyrophyllite 50 / Abdrakhimova ES The effect of pyrophyllite on the structure of porosity and physicomechanical properties of acid-resistant materials / E.S. Abdrakhimova, V.Z. Abdrakhimov // Materials Science. - 2003. - No. 9. - C.40-44 / [1].

The disadvantage of this composition is the heat resistance - 12 heat transfer.

Closest to the invention is a ceramic mass for the manufacture of acid-resistant, including the following components, wt.%: The clay part of the "tails" of gravity of zircon-ilmenite ores - 50, pyrophyllite - 40, feldspar concentrate - 10 / Abdrakhimova ES Study of water permeability and fracture structure of acid-resistant, obtained using waste products / E.S. Abdrahimova, V.Z. Abdrakhimov // Materials science. - 2001. - No. 10. - S. 52-56 / [2], adopted as a prototype.

The disadvantage of this composition of the ceramic mass is the low mechanical strength of acid-resistant tiles, fired at a temperature of 1200 ° C - 57.2 MPa.

The essence of the invention lies in the use of bentonite with a plasticity number of more than 40 in acid-resistant materials based on the clay part of the tails of gravity of zircon-ilmenite ores.

The technical result of the invention is to increase the mechanical strength of acid resistant.

The specified technical result in the implementation of the invention is achieved by the fact that in the known ceramic mass for acid resistance, including the clay part of the "tails" of gravity of zircon-ilmenite ores, pyrophyllite and feldspar concentrate, a feature is that bentonite with a plasticity number of more than 40 is additionally contained in the following the ratio of components, wt.%:

clay part of the “tails” of gravity zircon-ilmenite ores 15-50 pyrophyllitis 40-60 feldspar concentrate 5-10 bentonite with a ductility number over 40 5-15

Bentonite added to the ceramic masses with a ductility number of more than 40 significantly improves the molding properties of ceramic masses and allows the use of more than 50% of dampers and fluxes in the charge. The average chemical composition of Tagan bentonite is represented by the following oxides, wt.%: SiO ₂ - 56.8; Al ₂ O ₃ - 18.21; Fe ₂ O ₃ - 5.58; TiO ₂ - 3.81; CaO 2.81; MgO - 2.28; R ₂ O - 2.38; p.p.p. - 7.34. Tagan bentonite is highly dispersed in the content of particles less than 0.001 mm (75-85%) in size, and in terms of plasticity (plasticity number 40-55) is highly plastic clay raw material. In terms of refractoriness, Tagan bentonite belongs to the class of fusible clays (refractoriness 1220-1250 ° С). Clay minerals in bentonite are mainly represented by montmorillonite.

The ceramic mass was prepared by plastic molding at a moisture content of the mixture 18-22%. The molded tiles 100 × 100 × 20 mm in size were dried to a residual moisture content of 5-7%. The dried tiles were fired at a temperature of 1200 ° C.

Table 1 shows the compositions of the ceramic masses, and in Table 2, the physical and mechanical properties of acid-resistant tiles.

Table 1.
The compositions of ceramic masses Components Compositions Prototype one 2 3 four The clay part of the tails of gravity of zircon-ilmenite ores fifty 40 thirty fifteen fifty Pyrophyllitis 40 45 fifty 60 40 Feldspar concentrate 5 7 8 10 10 Bentonite with a ductility number over 40 5 8 12 fifteen Table 2.
Physico-mechanical properties of acid-resistant tiles Indicators Compositions Prototype one 2 3 four Thermal resistance, heat exchange fourteen fifteen 17 17 Mechanical bending strength, MPa 63 65 68 71 57.2

As can be seen from table 2, acid-resistant tiles from the proposed compositions have a mechanical bending strength higher than the prototype.

This technical solution allows to obtain acidproof with high mechanical strength in bending. The use of industrial waste in the production of acid refractories contributes to the utilization of industrial waste, environmental protection and the expansion of the raw material base for the ceramic industry.

Information sources

1. Abdrahimova E.S. The effect of pyrophyllite on the structure of porosity and physicomechanical properties of acid-resistant materials / E.S. Abdrakhimova, V.Z. Abdrakhimov // Materials Science. - 2003. - No. 9. - C.40-44.

2. Abdrahimova E.S. The study of water permeability and fracturing of the structure of acid-resistant materials obtained using industrial wastes / E.S. Abdrakhimova, V.Z. Abdrakhimov // Materials Science. - 2001. - No. 10. - C. 52-56.

Claims (1)

Ceramic mass for producing acid-resistant materials, including the clay part of the tails of gravity of zircon-ilmenite ores, pyrophyllite and feldspar concentrate, characterized in that it additionally contains bentonite with a plasticity number of more than 40 in the following ratio, wt.%: The clay part of the tails of gravity of zircon-ilmenite ores 15-40 Pyrophyllitis 45-60 Feldspar concentrate 7-10 Bentonite with a ductility number over 40 8-15