SU808381A1 - Method of preparing glass charge for making colourless glass - Google Patents

Description

The invention relates to the industry of building materials, in particular to a technology for producing a glass charge for the production of colorless glasses.

A known method of purification of fine-grained materials (diatomite, tripoli, etc.) by mouth of impurities · iron oxide by pretreating them with mineral acids (nitric, hydrochloric), on the basis of which alkaline-siliceous solutions with a high Modulus are obtained [1].

The disadvantages of the method are the formation of a large amount of irreversible acid effluents, the incomplete extraction of iron impurities from the processed material, as well as the difficult working conditions with acids.

The closest in technical essence and the achieved result to the proposed one is a method of producing a glass mixture for the production of colorless glasses by preparing alkali-siliceous solutions, treating them in a jet reactor and hydrothermally processing the obtained silicate products together with other charge-forming components [2].

However, in this method, the basis for the production of liquid glass, as for all alkaline-siliceous solutions, is perlite, taking into account the minimum content of iron oxides in it. The use of these solutions for the production of colorless glasses is limited depending on the content of coloring oxides, such as Fe ^ O ^, in them, and the content of iron oxide impurities in the production liquid glass is relatively high (above * 0.02% PejOj is unacceptable).

The purpose of the invention is the intensification of the process.

This goal is achieved by the fact that in the method of producing a glass mixture by preparing 'alkaline cream · non-greasy solutions, processing them in

I

a jet reactor and hydrothermal treatment of the obtained silicate products together with other charge-forming components, alkaline-siliceous solutions in the jet reactor are treated with 0.1-1.0% Trilon B solution at a rate of 4-10 l / s, and hydrothermal treatment is carried out at 650-850 ° C.

The essence of the method is as follows.

Depending on the concentration of the Trilon B solution and the feed rate of the alkaline-siliceous solution under conditions of cavitation shocks, the rate of complexation of iron with Trypon B changes significantly and, accordingly, the complex precipitates.

Alkaline-siliceous solutions obtained on the basis of natural raw materials - perlite, diatomite, tripoli and others for quartz sand by known methods, in a jet reactor is treated with 0.1-1.0% Trilon B solution at a rate of alkaline-siliceous solutions 4-10 l /from.

The resulting mixture is then filtered and the alkaline-siliceous solution purified from iron oxide is carbonized according to a predetermined glass composition. ·

The pulp is filtered and the purified high-modulus alkaline silicate obtained in the precipitate is separated, which is prepared according to the recipe of the mixture with the necessary charge-forming components and subjected to hydrothermal treatment, drying and sintering in a granulator dryer, where the mixture is beaten with a moisture content of 6080% and leaves in the form of sintered granules * at 650-850 ° C.

The resulting silicide-formed, heat-treated mixture. upload to. glass melting furnace heated to. · 1200-1350 ° С depending on the given glass composition, to avoid the loss of alkali metals and the intensification of glass melting processes.

Example 1. We have a potassium alkaline-siliceous solution with the following chemical composition, in which there is 0.08% harmful impurity of iron oxide: 61 0 ^ 107 g / l, KdO in the list for Nd ^ O 50 g / l; Fe ^ O ^ 0.08% / A

Si Od.

2.2

After circulation, the resulting mixture is filtered, and a very small amount of precipitate is formed, which is separated by filtration. In the filtrate, a purified alkaline-siliceous solution with an iron oxide content of 0.00016% is obtained. Based on this solution for a given glass composition, a mixture is prepared for the production of colorless glass of any composition (alkaline or alkaline). The prepared mixture is fed to a plate granulator-dryer for heat treatment with a mixture of crystal composition, wt.%:

1.5

po. 24.0 Si _g 57.0 CaO 1,0 about. 1,0 W ^ OZ 1,0 to _r about 16.0 Sintering charge occurs

at 700 sintering thermal temperatures of 750 ° C, after which the worked granules are transferred for cooking to a glass melting furnace at 1250-1300 ° C.

PRI me R 2. We have a sodium alkaline-siliceous solution with the following chemical composition, in which there is 0.04% of harmful impurities of iron oxide:

SA 0 _a 60 g / l; N a ^ O 49.6 g / l; Fe <£> ₃ 0.04%, M = 1.2.

This alkaline-siliceous solution is fed into the mixing chamber of the jet reactor at a rate of 10 l / s, and a 0.1% solution of Trilon B.

The resulting mixture after filtration is filtered. In the filtrate, a purified liquid glass solution with an iron oxide content of 0.00015% is obtained, which is then carbonized and the finished paste-like mass with a moisture content of 70% is fed to a plate granulator dryer for heat treatment. °

In this case, a mixture of the following glass composition is prepared, wt.%:

S i 0 _g 59.0 K _r 0 14.0 N _a 0 10.0 CaO 10.0 Z / jO 5,0 Rio 2.0 Sintering blends

at 550 it is fed to var

650 ^w C, after which ku at 1200-1250 ^and C.

Example 3. We have potassium liquid glass with the following chemical composition, in which there is 1.2% impurity of iron oxide: Si 0-j 117 g / l, K ^ O in the list for Na ^ J 30.0 g / l, Re ^ O- ^ 0.12%, and * 3-10 _g ίϊαΞο

- 4.0

This liquid glass solution is fed into the displacement chamber of the jet reactor at a speed of 4 l / s, and a 1.0% solution of Trilon B.

After circulation, the resulting mixture is filtered. In the filtrate, a solution of liquid glass is obtained, purified from impurities of iron oxide up to 0.00096%, on the basis of which the composition

S-io-x

AC ^ 0 _b 2P0

PPO

BaO _and about to

The obtained components with preparing the mixture of the following optical glass, wt.% 1 41,85

0.20

5.25

33.40 '11.55

8.25. a mixture of charge-forming materials with a total humidity of 60% is fed to drying-granulation and heat treatment on a vertical granulator-dryer. Sintering of the hydrogenated charge of the composition of the optical glass occurs at 750-850 ° C, i.e. at a sintering temperature, which is directly proportional to the composition of the glasses, depending on which it changes accordingly. Sintered particles of the charge are fed into a glass melting furnace at 1300-1350 ° C.

The proposed method allows to obtain a mixture of stable composition with a high degree of purity. This process is intensified due to the reduction, acceleration and simplification of technological processes and increased productivity of units. The raw material base for the production of colorless glasses and the possibility of producing hydrated blends are expanding. The process of glass melting is accelerated and cheaper, as the mixture is fed into the furnace in the form of cake and at higher temperatures. At the same time, the percentage of alkali loss is reduced and the cost of hardware design of the process and glass consumption are reduced.

Claims (2)

The invention relates to the construction materials industry, in particular, to the technology of producing glass batch for the production of colorless glass. A known method of purification of fine-grained materials (diatomite, tripoli, etc.) t impurities of iron oxide by pretreatment them with mineral acids f nitric, hydrochloric), on the basis of coats are obtained alkaline silica minerals with a high modulus. The disadvantages of the method are the formation of a large amount of irreversible acid waste, incomplete extraction of iron impurities from the material being processed, as well as severe conditions with acids. The closest in technical essence and the achieved result to the proposed is a method of obtaining a glass batch for the production of colorless glasses by preparing alkaline-silica solutions, processing them in a jet reactor and: processing the obtained silicate products together with the rest of the lithium-forming components l2 However, in this method the basis for the preparation of liquid glass, as for all alkaline silica solutions, is perlite with its minimum oxide content iron fishing. The use of these solutions for the production of colorless glass is limited depending on the content of dye oxides, such as, and the content of impurities of iron oxides in the production of liquid glass is relatively high (above 0.02% is unacceptable). The purpose of the invention is to intensify the process. The goal is achieved by the fact that in the method of obtaining the glass batch by preparing alkaline-silica solutions, processing them in a jet reactor and hydrothermal processing of the obtained silicate products together with the rest of the forming components, the alkali-silica solutions in the jet reactor are treated with OD-1.0% solution of Trilon B ari, the rate of their introduction into the reactor is 4-10 l / s, and the hydrothermal treatment is carried out at 650-85 ° C. The essence of the method is as follows, Depending on the end Concentrations of the Trilon B solution and the feed rate of the alkaline – silica solution, under the conditions of cavitation impacts, significantly change the rate of complex formation of iron with Trilon B and, accordingly, precipitate the complex. Alkaline silica solids derived from natural raw materials - perlite, diatomite, tripoli, etc. for quartz sand by known methods, in a jet reactor are treated with a 0.1-1.0% solution of trilon B at a rate of alkaline-silica solutions of 4-10 liters /with. Then, the resulting mixture is filtered and the non-saline solution purified from iron oxide by alkaline solution is subjected to carbonization according to the specified glass composition. The pulp is filtered and the purified high modulus alkaline silicate is obtained in the sediment, which is compounded according to the recipe of the charge with the necessary charge-forming components and subjected to hydrothermal treatment, drying and sintering in the dryer-granulator, where the charge n (H1 is with humidity 80% and goes to the form of agglomerated granules at 650-85 ° C. The resulting silicide-forming, heat-treated mixture is loaded into a glass-melting furnace heated to; 1200-1 depending on the composition of glasses, to avoid the loss of alkali metals and in Tensification of glassmaking processes. Example 1. We have a potassium alkaline-silica solution with the following chemical composition, O has O, O8% of a harmful admixture of iron oxide: i-g / l, Ca.O in the list for NOiO SO g / l; , 08% After circulation, the resulting mixture is filtered, a very small amount of osnlka is formed, jtoTopoe is separated by filtration. In (|| ilg (1ate, a purified alkaline solvent is obtained with an iron oxide content of 0.00016%. Based on this solution, according to a given glass composition, a mixture is prepared for the production of colorless glass of any composition (alkaline or alkaline). The prepared mixture is fed to a plate granule torus dryer for heat treatment at a mixture of crystal, wt.%: PbO. 5V 0-3 CaO Z /) O. Sintering of the charge occurs at 7OO75 ° C, after which the heated pellets are transferred to a glass melting furnace at 125 ° -13OOC. Example 2: We have a sodium alkaline siliceous solution, with the following chemical composition, which contains 0.04% of a harmful admixture of iron oxide: SAO. 60 g / l; 49.6 g; 0, O4%, M 1.2. This alkaline silica solution is fed into the mixing chamber of the jet reactor at a rate of 10 l / s. O, a 1% solution of trilon B, is also fed there. The resulting mixture is filtered after circulation. In the filtrate, a purified liquid glass solution with an iron oxide content of 0, O0015% is obtained, which is then carbonized and a pasty mass with a moisture content of 70% is fed to a plate dryer-granulator for heat treatment. ° In this case, a mixture of the following glass composition is prepared, wt.%: The sintering of the mixture occurs at 55065 ° C, after which it is fed for boiling at 1200–1250%. We have a potassium liquid glass with the following chemical composition, which contains 12% iron oxide impurity: 5i O / j 117 g / l. river on N DZ, O g / l, Pe, j, (D. 0.12%, 58 This pacTiiop liquid glass is fed into the mixing chamber of the jet reactor at a rate of 4 l / s, 1% O is also supplied Trilon B. After circulation, the resulting mixture is filtered. The filtrate produces a solution of liquid glass purified from iron oxide impurities to 0.00096%, on the basis of which a mixture of the following optical glass composition, wt.% SiOa41.85, 20 2.PO5, is prepared, 25 Pby 33,4O BaO 11.55 K, 0 / 8.25. The resulting mixture of charge-forming components with a total moisture content of 60%. It is fed for drying-granulation and heat treatment on a vertical A granulator dryer. The sintering of the hydrotized charge of the optical glass composition takes place at 75 ° -85 ° C, i.e. at the sintering temperature, gf m0 proportional to the composition of the glass, depending on which it changes accordingly. The sample particles are fed into a glass furnace at 1300-1350 ° C. The proposed method allows to obtain a batch of stable composition with a high degree of purity.This process is intensified due to the reduction of acceleration and simplification of technological processes and increase in the productivity of the unit at. The raw material base for the production of colorless glass and the possibility of producing hydro-charge blends is being expanded. The glass melting process is accelerated and cheapened, since the charge is fed into the furnace in the form of a cake and at more extreme temperatures. This reduces the percentage of lost alkalis and reduces the cost of process instrumentation and glass consumption. The method of obtaining the glass batch For the production of colorless glasses by preparing alkaline-silica solutions, processing them in a jet reactor and hydrothermal processing of the obtained silicate products, together with the rest of the blend-forming components, characterized in that, in order to intensify the process, the alkaline-silica components are processed in an alkaline-containing components in order to process the alkaline-silica components in order to process the alkaline-silica solutions in order to intensify the process. , 11, 0% solution of Trilon B at the rate of their introduction into the reactor l / s, and the hydrothermal treatment is carried out at 650-8 50 ° C. Sources of information taken into account in the examination 1.Melkon G.S. Hydrothermal method of preparing complex glassy canazite based on rocks and their products. Yerevan Hayastan, 1977, p. 84 2. The patent of Switzerland No. 583147, cl. From 03 To 1 / OO, publ. 1976.