SU1636349A1 - Process for preparing glass stock - Google Patents

Abstract

The invention relates to methods for producing glass and can be used in the manufacture of glass containers, tiles and other types of sodium-calcium silicate glass products. The aim of the invention is to reduce the cooking time and increase uniformity. To do this, in the method of preparing the glass batch by mixing quartz sand, nepheline, soda ash, sodium sulfate and CaO, MgO-containing component, waste is also added to the batch after crushing tightly baked flux dolomite lime obtained by roasting at a temperature of 1650- 1850 ° C in a flare of combustible gas fuel and pulverized coal in the amount of 2.5-10 kg per 100 kg of glass mass. The uniformity of the glass melt is 3.0-4.1 ° C, the duration of the clarification is 2.8-3 hours. Table 2. (L

Description

The invention relates to methods for producing glass and can be used in the manufacture of glass containers, tiles and other types of sodium-calcium silicate glass products.

The aim of the invention is to reduce the cooking time and increase uniformity.

To obtain glass, the waste after crushing is sieved through a sieve of 0.63-0.315. Burnt flux dolomite lime has the following chemical composition, wt.%: SiOa 1.0-12, O; A1g03 1.0-7.0; Cr03: 0.1-2.5;

0.1-2.5; TiO% 0.05-0.3; CaO 30.5- 60.8; MgO 20.5-40.5; S2 0.06-0.1.

A significant acceleration of glassmaking processes according to the proposed method occurs due to the combination of chemical and mineral compositions with the physicochemical properties of the new CaO, MgO-containing component (waste of flux dolomitic lime) when the latter is added to the known carbonate raw materials.

According to the conditions of technology, the waste of burned dolomite is a powdery material with a dense structure and has the following mineo

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about

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with

General composition: CaO, MgO, 54 CaO, 16 31.0Ј, A1203, MgO, 4 CaO, A140§, RegOe, and other calcium aluminates.

When mixed with water, 3–8% bulk material acquires an increased reactivity with respect to other components of the charge (sand, soda, aluminum-containing raw materials, traditional dolomite, chalk, lime) due to the partial formation of Ca (OH) g from CaO and the emergence of a new of the crystalline phase CaO A1gOdx X10 H20-CaA1g (OH) 8 6H20 instead of calcium aluminates

As a result, the solubility of the waste in the molten sodium-calcium silicate glass increases. Possessing a surface-active property, burnt dolomite also contributes to the acceleration of the reaction and the dissolution of solid particles and causes a sharp increase in the size and speed of lifting bubbles from the molten glass.

The recommended ratio of waste burned dolomite and carbonate raw material for the introduction of CaO and MgO contributes to the increase in the homogeneous glass mass

Testing of the method of producing glass is carried out on the basis of green glass of ZT-1 brand of the following chemical composition, wt.%: Si02 71.3; A120e + Reg9z 3.8; CaO + MgO 11.0; Na20 13.8; Oh, 1. The charge is prepared from known raw materials (sand, nepheline, chalk, soda, sodium sulfate and coal), to which waste calcined dolomite is added in an amount of 1.5-11.0 kg per 100 glasses. , Chemical composition of waste, wt.%: B102 7.7; A1g03 3.4; , 1.7; CaO 53.5; MgO 31.81; Crz03 0.2; , 04; Ti02 0.11 ppt 1.55.

0

In tab. Table 1 shows examples of blends for obtaining the original green glass.

Glasses are cooked in a two-chamber furnace according to a single temperature and gas conditions. The results of experimental cooking and properties of welded glass are given in Table. 2

Using the proposed method of producing glass using waste calcined dolomite in combination with carbonate raw materials in a certain ratio allows a significant increase in glass removal and production in existing areas, lower specific fuel consumption, improve glass quality, reduce production costs, reduce consumption of conditioned mineral and expand the use of industrial waste.

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Claims (1)

25 claims about The method of preparing the glass batch mainly for the preparation of sodium-calcium silicate glass by mixing quartz sand, nepheline, soda ash, sodium sulfate, and CaO, MgO-containing component, characterized in that, in order to reduce the cooking time and improve uniformity, into a mixture additionally, waste is introduced after crushing tightly baked flux dolomite lime obtained by roasting at a temperature of 1650-1850 ° C in a torch of combustible gas fuel and pulverized coal in a quantity of 2.5-10.0 kg per 100 kg of glass mass. five 0 2.5 9.2 7.5 9.1 Table 1 1.5 9.2  11.0 9.0 8.4 Raw materials i Continuation of table 1 table 2