RU2307105C2 - Ceramic mix for production of acid-resistant wares - Google Patents

Abstract

FIELD: manufacture of ceramic materials; composition of ceramic mixes for production of acid-resistant wares.

SUBSTANCE: calcium-containing slag obtained from white cast iron production process is added to ceramic mix containing clay part of "tailings" of zircon-ilmenite ore gravity concentration process, pyrophyllite and broken ceramic at the following ratio of components, mass-%: clay part of "tailings" of zircon-ilmenite ore gravity concentration process, 40-55; pyrophyllite, 35-40; broken ceramic, 3-6; slag 7-14.

EFFECT: enhanced heat resistance and acid resistance of ceramic mix.

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Description

The invention relates to the industry of ceramic materials, mainly to compositions of the masses to obtain acidproof.

A ceramic mass is known for producing acid-resistant materials of the following composition, wt.%: Zhana-Daursky clay - 50, pyrophyllite - 50 / Abdrakhimova E.S. Kinetics of changes in the structure of porosity in the process of acid-resistant firing / E.S. Abdrakhimova, V.Z. Abdrakhimov. // News of universities. Construction. - 2000. - No. 9. - S. 38-41 / [1].

The disadvantage of this composition is the relatively low frost resistance (30 cycles) and the content in the charge of scarce expensive Zhana-Daursky refractory clay.

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 - 50-60, pyrophyllite - 35-41, ceramic battle - 5-6 / Pat. 12390 Republic of Kazakhstan, IPC С04В 33/00. Ceramic mass for acid-proofing / E.S. Abdrakhimova, V.Z. Abdrakhimov. - Publ. 12/17/02, Bull., No. 12 / [2]. Adopted for the prototype.

The disadvantage of this composition of the ceramic mass is low heat resistance.

The technical result of the invention is to increase the heat resistance and acid resistance of the ceramic mass.

The specified technical result is achieved by the fact that in the known ceramic mass, including the clay part of the “tails” of gravity of zircon-ilmenite ores, pyrophyllite and ceramic battle, calcium-containing slag from the production of white iron is additionally introduced in the following ratio of components, wt.%:

clay part of the “tails” of gravity of zircon-ilmenite ores 40-55 pyrophyllitis 35-40 ceramic fight 3-6 calcium slag from white iron production 7-14

Calcium-containing slag from the smelting of white iron was used as a cleaning agent and flux to reduce shrinkage and water absorption. It is known that CaO, despite the high melting point, in clay-containing masses is a strong flux due to the formation of relatively low-melting compounds with Al ₂ O ₃ and SiO ₂ . Therefore, calcium-containing slag from the smelting of white iron is used instead of traditional expensive natural floods, such as chalk, dolomite and other calcium-containing components. In addition, the introduction of calcium-containing slag from the production of white cast iron into the ceramic masses contributes to the formation of mullite during firing. Mullite increases the frost and heat resistance of acid-resistant materials. The chemical composition of the components is given in table 1.

Table 1.
The chemical composition of the components Components The content of components, wt.% SiO ₂ Al ₂ O ₃ Fe ₂ About ₃ CaO MgO R ₂ O P.p.p. The clay part of the “tails” of gravity of zircon-ilmenite ores 58.74 21.39 6.21 1.81 1.8 1,62 7.34 Pyrophyllitis 52.8 34.9 0.4 0.22 0.1 0.09 7.88 Calcium-containing slag from smelting of white cast iron 36.34 13.5 0.61 40.1 5.26 1.66

The ceramic mass was prepared in a plastic way at a moisture content of 18-22%. Square tiles of type PK-1 were formed, which were dried to a residual moisture content of not more than 5% and then fired at a temperature of 1250 ° C. Table 2 shows the compositions of the ceramic masses, and in table 3 the physical and mechanical properties of acid-resistant tiles.

Table 2.
The compositions of ceramic masses Components The content of components, wt.% one 2 3 four 5 The clay part of the “tails” of gravity of zircon-ilmenite ores 55 fifty 45 42 40 Pyrophyllitis 35 37 38 39 40 Ceramic fight 3 four 5 6 6 Calcium-containing slag from smelting of white cast iron 7 9 12 13 fourteen Table 3.
Physicomechanical indicators of acid resistance Indicators Compositions Prototype one 2 3 four 5 Frost resistance cycles 75 80 84 88 85 Heat resistance, heat exchange 17 19 21 23 22 11-13 Acid resistance,% 97.8 98.1 98.4 98.5 98.4 97.4-97.8

As can be seen from table 3, acid-resistant tiles from the proposed compositions have higher acid resistance and heat resistance.

The resulting technical solution will allow using waste products to obtain heat-resistant and acid-resistant acid-resistant. The use of industrial waste in the production of ceramic acid-resistant materials contributes to their disposal, environmental protection and the expansion of the raw material base for building ceramic acid-resistant materials.

Information sources

1. Abdrahimova E.S. Kinetics of changes in the structure of porosity during acid-firing firing / E.S. Abdrakhimova, V.Z. Abdrakhimov. // News of universities. Construction. - 2000. - No. 9. - C 38-41.

2. Pat. 12390 Republic of Kazakhstan, IPC С04В 33/00. Ceramic mass for acid-proofing / E.S. Abdrakhimova, V.Z. Abdrakhimov. - Publ. 12/17/02, Bull., No. 12.

Claims (1)

Ceramic mass for the production of acid-resistant materials, including the clay part of the tails of gravity of zircon-ilmenite ores, pyrophyllite and ceramic battle, characterized in that it additionally contains calcium-containing slag from the production of white iron with a Fe ₂ O ₃ content _of 0.61 wt.%, And CaO and Al ₂ O ₃ respectively 40.1 and 13.5 wt.% In the following ratio of components, wt.%: The clay part of the tails of gravity of zircon-ilmenite ores  40-55 Pyrophyllitis  35-40 Ceramic fight  3-6 Specified Slag  7-14