SU1475891A1 - Method of preparing glass-melting charge - Google Patents

Abstract

The invention relates to the building materials industry, in particular, to the technology of preparing mixtures for melting glasses of various compositions. To reduce the glass melting temperature, the method of preparing the glass batch is carried out by introducing water-insoluble components into an alkaline-silica solution, carbonizing, filtering and pressing at a pressure of 20–70 kbar for 1–3 minutes. The glass melting temperature of the pressed mixture does not exceed 1000 ° C. 1 tab.

Description

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The invention relates to the building materials industry, in particular to the technology of preparing a mixture for glass melting.

The purpose of the invention is to reduce the glass melting temperature.

Chemically activated charge is pressed under pressure of 20-70 kbar at normal temperature for 1-3 minutes.

Under the influence of pressure in a chemically activated charge, the molecules of amorphous hydrosilicates are rearranged, compacted and the distance between them decreases, which leads to the transition of amorphous hydrosilicates to crystalline forms in the form of calcium-aluminosilicates of the composition: ЗСа (AUSigOa) (meijonite), Ca (Al2Si2Os ) (anortite) and Na (AlSi2O6) H2O (analcime).

The table shows the interplanar spacing of radiographs taken from the pressed chemically activated charge, and for comparing the X-ray data of the original uncompressed chemically activated charge.

As can be seen from the table, an x-ray image of the initial non-pressed chemically activated charge contains an insignificant amount of interplanar spacings, which indicates its amorphism.

The roentgenogram of the pressed chemically activated charge sample contains interplanar spacings belonging to complex silicates such as meonite, anortite, and analcime.

The invention is illustrated below by examples.

Example 1 To obtain an amorphous chemically activated mixture for sheet glass, ground dolomite and technical alumina are introduced into the alkaline-silica solution. The resulting PUL4 1

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A pu, characterized by G: T 20: 1, is fed to a carbonizer (foam apparatus), into which a mixture of air and carbon dioxide is simultaneously introduced. At 50 ° C, carbon dioxide gas reacts with the pulp in the foam apparatus. The carbonization process is carried out until the degree of carbonization is 115%. After carbonization, the resulting pulp is fed to a drum vacuum filter, in which the solid phase is separated from the liquid.

The precipitate separated off by filtration is a chemically activated precipitated mixture. From the total mass take 5 g, pressed under a pressure of 50 kbar at normal temperature for 2 minutes.

X-ray examination shows the presence of calcium-sodium-aluminosilicates in the sample of the crystalline phase (30% of the total mass of the mixture). The mixture at 900 ° C is converted into a solid sintered glass with partial glass formation. Melting starts from 980 ° C and up to 1000 ° C for 2 hours, the charge goes completely into the glass phase.

Example 2. Chemically activated mixture of the composition of sheet glass, wt.%: SiO2 72.5; MgO 4.0; CaO 6.6; A12O3 1.9; NaaO 14.8 - in the amount of 5 g is treated under pressure of 20 kbar at a normal temperature for 3 minutes.

An X-ray diffraction study showed the presence of a crystalline phase in the sample in the form of calcium, sodium aluminosilicates (30% of the total mass of the mixture).

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Example 3. Chemically activated mixture in an amount of 5 g is treated under pressure of 50 kbar at normal temperature for 2 minutes.

The roentgenogram of the indicated sample showed the presence of crystalline calcium-sodium-aluminosilicates (70% of the total mass of the mixture).

Example 4. Chemically activated mixture in the amount of 5 g is treated under pressure of 70 kbar at normal temperature for 1 minute. The X-ray diffraction pattern of the indicated sample showed complete crystallization to produce calcium sodium aluminosilicates.

A visual observation shows that, at 900 ° C, the charge of examples 2-4 is converted into a solid cake with partial glass formation. When heat treated to 1000 ° C for 2 hours, the batch is completely transformed into a glass phase.

Thus, the proposed method provides an increase in the density of the mixture, which leads to an increase in thermal conductivity of the mixture during the cooking process.

Claims (1)

Invention Formula The method of preparing the glass batch by introducing water-insoluble components into the alkaline-silica solution, carbonization, filtration and pressing, characterized in that, in order to reduce the glass melting temperature, pressing is carried out at a pressure of 20-70 kbar for 1-3. min Initial chemically activated charge4 2,905, 2,191, 2,017, 4.53, 3.049, 2.995 Dolomite Alumina, the rest (90%) amorphous mass