SU771065A1 - Charge for producing wall ceramic articles - Google Patents

Description

The invention relates to the building materials industry and can be used in the manufacture of wall ceramic products. Known ceramic mass for the manufacture of chemically resistant products, including, wt.%: Clay binder 10-40 and iron ore 60-90 1.1] ·

The main disadvantages of the products made from this mixture are high firing temperature ⁱⁿ C 12501350, 'the use of rich industrial ores that are needed ferrous metallurgy. _o * ³

All these disadvantages are associated with the fact that iron acts as a filler and does not participate in the formation of the crystallization binder of the material.

Closest to the invention is a charge containing 58-83% by weight of the tailings of enrichment of ferruginous quartzites, 12-27% of a calcium-containing component (lime or chalk or gypsum) __ and 5-15% of active silica [2].

The main disadvantage of the material prepared from the mixture _etc. is relatively high firing temperature (1125-1150 ° C). thirty

The aim of the invention is to reduce the firing temperature while maintaining the quality of the products.

This goal is achieved by the fact that the mixture for the manufacture of wall ceramic products, including tailings for the enrichment of ferruginous quartzites and a calcium-containing component, contains wollastonite and optionally coal as a calcium-containing component in the following ratio of components, May.%:

Ferruginous quartzite enrichment tails 72-85

Wollastonite 12-20

Coal 3-8

The given ratio of components provides activation of the formation of iron containing compounds at low calcination temperatures due to the creation of a reducing medium in the ceramic body.

The achievement of this goal is also facilitated by the use of wollastonite as a crystallization seed.

The quantitative ratio of components in the charge is regulated with

7106.5, ..

holding iron in the tailings of enrichment and wollastonite in the rock.

For more active involvement of crystalline quartz waste in the reaction of the formation of iron-containing compounds, 10-20% of these wastes are preliminarily crushed to a specific surface of 4000-5000 cm ² / g, and wollastonif rock up to 1000-2000 cm ² / g, coal is crushed before passing through a sieve with a hole size in the light of up to 1.0 mm, and then everything is thoroughly mixed.

In the process of roasting raw, made from this mixture, in the temperature range 950-1050 ° C, the coal burns out, creating a reducing environment inside the products, which contributes to the reaction according to the following schemes:

С ----- · ”6FeO + С0 _g ..

С -> - ~ 4FeO + С0 ₂ С ----- 2Fe0 + СО ^ of these processes the activity of zhedea sharply increases, which even at a relatively low temperature (950-1050 ° С) leads to the interaction of it with natural wollastonite and the formation of this complex glandular compounds.

Example. In laboratory conditions from the charges given in table. 1, cylinders with a height and diameter of 50 mm are made samples.

Table 1

The compositions of the control charge in mass% to samples are fired at 950, 1000, and 10 ° 0 ° C for 2 and 3 hours.

The test results of the samples are given in table. 2.

table 2

About- The Time Other Volume- Water- ra- pe- me nost naya absorption zets ra- about- at ma- % shih that— jig. hedgehog sa YOU ra obzhi- ha, ° C h TII, kg / / cm ^J g / cm

Fe, 0 ^ + 2Fe? 0, +. 2FeO ^E +

Due

¹ 950 3 930 2.07 12,4 2 1000 3 1025 2.09. 10.7 3 1050 2 780 2.23 11.1

Thus, the developed composition of the charge allows to obtain high-quality wall ceramic products based on ferrous quartzite enrichment waste at firing temperatures adopted at existing ceramic plants.

Claims (2)

iron holding in tailings and wollastonite in the rock. In order to more actively involve the crystalline quartz of wastes in the reaction to form iron-containing compounds, 10–20% of these wastes are crushed to a specific surface of 4,000–5,000 cNiVr, and wollastoniteByra coal is crushed to 1000–2,000 cnV before passing through a hole size of light to 1.0 mm, and then mix everything thoroughly. In the process of processing raw made from this mixture, in the temperature range of 950-1050 ° C, coal burns out, creating a reducing environment inside the products that facilitates the reaction in the following schemes: 2Fe. C BREO + CO. + C - i-4ReO + COj. 2FeO + С- -, 2FeO + C0, j As a result of these processes, the activity of zheJ7eza increases dramatically, which leads even at a relatively low temperature (950-1050 ° С) to the interaction, with natural wollastonite and the formation of complex iron compounds. .Example. In the laboratory of the charges listed in Table. 1, make samples of cylinders with a height and diameter of 50 mm. Table. Compositions of control charges in% by weight Obragegl is prepared by semi-dry pressing from masses with a humidity of 10% at a pressure of 200 kgf / cm. The obtained samples are burned at 950, 1000 and 10§0c for 2 and 3 hours. The results of the test samples are given in table. 2. Table 2 Thus, the developed composition of the charge makes it possible to obtain high-quality wall ceramic products on the basis of waste enrichment of ferruginous quartzites at the “firing rates” adopted at existing ches- tic factories. Claims for making wall ceramics, including tailings of enrichment of ferruginous quartzites and a calcium-containing component, are different from Ayutsa so that, since the burning temperature is reduced, while maintaining the quality of the products, it contains wollastonite and, in addition, coal in the following ratio mass%; Enrichment tails of ferruginous quartzites 72-85 Wollastonite 12--26 Coal3-- 8 Sources of information taken into account in examination 1, USSR Author's Certificate No. 336297, cl. From 04 To 33/12, 1972. 2.Avtorskoe svidete.lstvo USSR №. 611895, cl. From 04 to 35/16, 1976 (prototype).