SU1011561A1 - Method for making phosphate glass - Google Patents

Abstract

1. METHOD FOR OBTAINING PHOSPHATE GLASS, including the interaction of the active component with orthophosphoric acid with the formation of a hardening mixture and its melting, so that in order to increase the productivity of the cooking process and increase the yield of glass, As a component with a tive component, a mixture of porous aks of metallic alkini and alumina hydrate is used. 2. The method according to p. 1, about t L and h ay u and with the fact that they use a mixture of powders in the following ratio, wt.%: ALUMINUM metschlichny 3-5. ; Aluminum oxide 95-97

Description

SP

O) The invention relates to the production of glass, preferably optical, and can be used for the production of glass containing oxides of phosphorus and aluminum as the main ingredients. A known method for producing phosphate glass from an aqueous slurry obtained by adding calcium, sodium and aluminum oxides f 1 to a solution of phosphoric acid. The disadvantages of this method are the heterogeneity of the mixture, which is a suspension containing solid particles, which leads to the formation of a baffle and heterogeneity of the resulting glass melt, as a result of which long-term homogenization is required. There is also known a method for the synthesis of phosphate glasses by loading the mixture in the form of an aqueous solution of salts and metal hydroxides and orthophosphoric acid into the furnace. 2 1 The disadvantage of this method is the need to use only water-soluble compounds, which imposes restrictions on the glass composition (it is impossible, for example, to obtain stable solutions containing 5102). In addition, the cooking energy consumption is significantly increased. glass due to the cost of evaporation of water and heating water vapor. The closest to the invention in its technical essence is a method of producing phosphate glasses by reacting the active iron compound at room temperature with a mixture of phosphoric and halogen acids to form a solidified intermediate and then heating the intermediate product in the presence of a reducing agent until the glass melt Cz is obtained. The disadvantage of this method is its use only for iron phosphate and alkali iron-phosphate glasses with a high iron content (20-45% FeO). These glasses, due to their low chemical resistance, can serve as a source of iron in the soil, but for the same reason they are unsuitable for the manufacture of optical components. The aim of the invention is to increase the productivity of the cooking process and increase the yield of suitable glass. The goal is achieved by the fact that according to the method of obtaining phosphate glass, which includes the interaction of the active component with orthophosphoric acid with the formation of a hardening mixture and its subsequent plating, a mixture of metallic aluminum and aluminum hydroxide is used as the active component. Moreover, the mixture of powders is taken in the following ratio, May.%: ALUMINUM metal 3-5 Aluminum oxide alumina 95-97 The active component provides solidification of the charge based on phosphoric acid without external heating. The active component is a mixture of metallic aluminum A and aluminum oxide hydrate AG (A; and Ap are given in terms of% Al20 glass content). Example 1. Optical aluminophosphate glass having a synthetic composition, wt.%: RoOC 77,22 / A1203 16.07; Si02 4.73; B 0.40, ZnO 0.20; ResO, 1.38, was prepared as follows, 67.36% PgO was introduced into the mixture in the form of NPWR, 9.86% PgO was introduced into the mixture as, 1.97% A120z was introduced into the mixture as A1 and 14.10 % A120 is introduced into the charge in the form of A1 (OH). Quartz sand, boric acid, zinc oxide, and iron oxide are used to introduce the remaining oxides. In example 1, the ratio; 0.14. When used as a source of aluminum-containing materials for aluminum powder PAP-2 GOST 5494-71 and aluminum hydroxide of qualification h GOST 11841-76, the active component for 0.5 kg of glass contains 5.2 g of metallic aluminum and 108.3 g of aluminum hydroxide, thus The composition of the active ingredient is 4.58% metallic aluminum and 95.42% aluminum hydroxide. The dry components of the mixture are mixed by the usual method known in optical glass melting, and then the calculated amount of orthophosphoric acid is poured into the resulting dry mixture. The process is carried out with mechanical stirring at room temperature (without external heating). Due to the reaction between metallic aluminum and orthophosphoric acid, the mixture is heated and a subsequent reaction between aluminum hydroxide and orthophosphoric acid begins. As a result of these Reactions, orthophosphoric acid is bound to form a mixture of acidic aluminum phosphates. The resulting blend is a dry physical homogeneous mixture. In the manufacture of a mixture of 0.5 kg of glass, the total time from wadding the acid into the dry mixture until complete solidification is 9-10 minutes.

Example 2. Glass synthetic composition specified in example 1, was prepared as follows.

1.47% is introduced into the mixture in the form Al; 14.60% Al20, introduced into the charge as А 1 (ОН).

In example 2, the ratio r is 0.10.

The weight composition of the active component of the charge per 0.5 kg of glass in this example is as follows: 3.90 g of metallic aluminum and 112.15 g of aluminum hydroxide, thus, the actin component contains 3.36% of metallic aluminum and 96.64% aluminum hydroxide.

The introduction of the remaining components and the course of the reaction are the same as in Example 1. The total solidification time is 14-15 minutes.

Physical homogeneity of the charge,

obtained by the proposed method allows it to carry out its metered load in a glass melting furnace, i.e. use in high-performance continuous glass melting process. Due to this, the yield of suitable glass is increased by 1.3-1.5 times.

Curing time for various values and percentage composition

This component is shown in Table 1.

Table 1

The results obtained of the mixture are physically homogeneous, dry, easily triturated mixtures.

It is established that at - 0.10

Ar

solidification reaction is low intensity, which reduces the productivity of the process.

At 0.15

Ar

the reaction is very violent, accompanied by foaming and splashing out

reaction mass. In both cases; out of the specified limits, the charge mixture is a plastic mass unsuitable for dosing into a glass melting furnace.

continuous operation.

, From charge 1 and 3 is carried out in laboratories. torny crucible furnace cooking (№ 9681 and № 9648). Measurement of indicators on: absorption shows that the spectral characteristic of glasses corresponds to category I of GOST 9411-75. The results are shown in Table. 2. Table 2

Claims (2)

1. METHOD FOR PRODUCING PHOSPHATE GLASS, including the interaction of the active component with phosphoric acid with the formation of a hardening mixture and its subsequent melting, with the aim of increasing the productivity of the cooking process and increasing the yield glass, as an active component using a mixture of powders of aluminum metal and aluminum oxide hydrate. 2. The method according to π. 1, about t l. and with the fact that they use a mixture of powders in the following ratio, wt.%: Aluminum metal 3-5 'Alumina Hydrate 95-97 § £>