SU1013404A1 - Method of producing low-modulus liquid glass - Google Patents

Abstract

1. A method for producing a low-level modular liquid glass, which includes dissolving crushed alkali metal silicate in water and introducing caustic soda, characterized in that, in order to increase productivity, caustic soda is introduced after dissolution (alkali metal silicate.

Description

4.5 4.25 l.Q

3.7515 PLN 3.0

(L

W

M

5 figure 1

2. The method according to claim 1, and wherein, with WTO, in order to eliminate the separation of the glass components, the alkali metal silicate solution is mixed with caustic soda for 15-18 minutes. The invention relates to methods for producing low-modulus, liquid glass and can be used in the glass manufacturing industry. A method for producing high-modulus liquid glass is known (see 2.653, 40 by dissolving crushed alkali metal silicate in water at elevated temperatures and pressures with periodic loading and unloading of products. Main disadvantage This method is its complexity, caused by the need to obtain highly dispersed quartz sand. The closest in technical essence and availability The desired result is the method of obtaining low-modulus liquid glass, which includes dissolving crushed alkali metal silicate in water and introducing caustic soda 2j. The disadvantage of this method is the low productivity of the process due to a decrease in the rate of alkali metal silicate dissolution in water in the presence of caustic The aim of the invention is to improve the performance of the process. The goal is achieved by those that according to the method of obtaining low modular liquid glass by successively dissolving an alkali metal in water, followed by the addition of sodium hydroxide to the resulting solution. It is preferable to add sodium hydroxide in the form of an aqueous solution with a concentrate. It is 44–50%, with no mixing time, 15–18 min. FIG. Figure 1 shows the dependence of the strength properties of the samples, based on low-modulus liquid glass (M. 2.15 on the time of mixing high-modulus liquid glass with caustic soda; Fig. 2 shows the dependence of the density gain of low modulus glass NMSCm 2.15) and high-modulus Navy glass (on concentration NaOH. On the basis of experimental data the optimal time was chosen

3. A method according to claim 1, characterized in that, in order to obtain high binding properties of glass, caustic soda is introduced in the form of a solution with a concentration of 4450 wt.%. mixing the components of low-modulus liquid glass (figure 1. The quality of mixing was evaluated by tensile strength (kg / cm 2) of samples made according to GOST 23409778 using low-modulus liquid glass prepared in accordance with this invention as a binder. Optimal mixing time 15 -18 min ensures the strength of the samples of 4.0 kg / cm2, which is 2 times higher than the strength of similar samples prepared on the basis of high modulus liquid glass. With stirring for less than 15 min, the strength The samples are insufficient, with an increase in the duration of more than 18 minutes, there is no increase in the strength of the samples. The optimum concentration range of caustic soda solution (44-l 50 wt.%) was determined experimentally and was due to the need to obtain low-modulus liquid glass with high density (1.501, 52 g (C1), allowing for improved bonding properties (Fig. 2). PRI and 1 ER. 900 kg of sodium silicate (module 2.9) with pieces of up to 500 mm are poured into the rotating autoclave through a loading hatch and heated up the water. The weight ratio of silicate and water is 1: 1. After that, the autoclave is sealed. the mechanism of rotation is turned on and steam is injected during the entire process of silicate dissolution. The time of dissolution of alkali metal silicate in a rotating autoclave at a vapor pressure of 8 kgf / ohm2 and an average temperature of 130 ° C is 1 h. The finished high modulus glass has a density of 1.48 g / cm. From the autoclave, the glass enters the mixer. The mixing time is 18 minutes. The amount of caustic soda is determined from the condition of bringing the glass module up to 2.15. Caustic soda is served in the form of a solution with a concentration of 48 wt.%. The finished low-modulus glass has a density of 1.52 g / cm ..

A similar experiment was carried out, but with the simultaneous feeding into the autoclave of the corresponding amounts of sodium silicate and caustic soda vreir / c f

m of alkali metal dissolution was Za.

The proposed method allows to increase the productivity of the autoclave by 3 times and at the same time, respectively, reduce the consumption of steam and electricity.

WZ

sh w

W3

sh

47 W6 W5

nms

Hffc

30%%%} f% S6% 39% wf. wr% ttS / .4yi sr /.

CTcentropype ffaOH FIG.

Claims (3)

1. A METHOD FOR PRODUCING A LOW-MODULAR LIQUID GLASS, comprising dissolving crushed alkali metal silicate in water and introducing caustic soda, characterized in that, in order to increase the productivity of the process, caustic soda is introduced after dissolving the alkali metal silicate. ff FIG! 2. The method according to π. 1, which differs from I’m saying that, in order to prevent the separation of glass components, the alkali metal silicate solution with caustic soda are mixed for 15-18 minutes. 3. The method of pop. 1, characterized in that, in order to obtain high binding properties of glass, caustic soda is introduced in the form of a solution with a concentration of 4450 wt.%.