SU919992A1 - Method of producing water glass - Google Patents

Description

(5k) METHOD FOR OBTAINING LIQUID GLASS

I

The invention relates to the technology of producing liquid glass, which is widely used in many industries, in particular for the production of building materials, silicate paints, adhesive and sealing substances, etc.

A known method of producing a liquid glass, which consists in boiling silicate-lumps from a mixture of alkali-containing components (soda ash, potash, sodium sulfate) and. quartz sand in conventional glass installations. The resulting silicate lump is cooled with water and dissolved in autoclaves at 150-175 ° C (0.4-0.8 MPa) c. for -6 h Cl.

The disadvantages of this method are the high energy consumption, labor intensity and duration,

The closest to the technical essence of the invention is a method of producing a liquid glass, comprising preparing a slurry from

silica-containing material in V (an e-liquor solution and hydrothermal treatment of the above suspension. Perlite is used as the silica-containing material. The known method consists of the following operations: Grind in a ball mill with a solution of caustic soda,

having a concentration to a grain size of 80-140 kg / m

less than 0.25–10 m for 25–30 min. The resulting pulp with a solid: liquid phase ratio of 1: (1.5–0.7) is fed to a continuously operating autoclave battery for heat treatment at 140–150 ° C for 30 -40 min After autoclaving, the pulp is filtered. Liquid glass, which constitutes 23–25% of the raw materials, passes into the filtrate, and the residue, containing about 50–70 wt.% Of the initial content of the rock, is re-treated with caustic alkali to further extract alkali metal silicates G2. However, the known method is characterized significant time and energy costs for grinding perlite and processing (dissolving) it with alkali in autoclave batteries. In addition to significant energy consumption and expensive equipment, the technological process in a known method is carried out at relatively high costs of alkali, which also increases the cost of production and contributes to the corrosion of equipment, reducing its service life. The aim of the invention is to reduce the duration of the process. The goal is achieved by preparing the suspension from silica-containing material with a particle size (o, 05-5) in an alkaline solution with a concentration of 40 kilogram / m in solution at a ratio of scientific research institutes to solid and liquid phases 1; (5.2-8, l a.hydrothermal treatment is carried out at 95-105 ° C and pressure (0.981, 013) 10 Pa for 45-90 minutes. As a silica-containing amorphous material, you can use aluminum fluoride production waste. as follows: The raw materials that were discharged in predetermined quantities: water, alkali or alkaline solution of a known concentration and finely dispersed waste from the production of aluminum fluoride are simultaneously loaded into the reactor with stirring. Continuing the stirring, bring the contents of the reactor to a boil and to ip t at 95-105С and pressure (0.98-1.013) 10 Pa. The resulting liquid glass is separated from the sediment in a known manner. As the silica component, use is made of the production of aluminum fluoride with a particle size of (o, 05) 10 m, having a chemical composition, wt.%: SiOi 87.7 ;, 2.39, 0.08, CaO 0.28, MgO 0.0; SPT 8.76-, NaijO 0.0 (; 0.02, a 4 humidity 66 wt.%. Technical sodium is used as the alkaline component. The amount of water is metered, taking into account the moisture contained in the waste production of aluminum fluoride and the specified ratio of solid and liquid phases of the prepared suspension. nziy. Of these raw materials, a suspension of 0.075 kg of aluminum fluoride production waste is prepared in predetermined ratios, which is 0.025 kg for dry matter or, based on chemical composition, 0.022 kg of silicon dioxide, 0.013 kg of sodium hydroxide, which corresponds to 0.008 kg of NanO and water . The amount of water is metered, taking into account the moisture introduced with the waste and the specified ratio of the solid and liquid phases in the suspension, equal to 8.4, i.e. The amount of water is 0.1–5 kg, and the alkali concentration is 40 kg / m. All raw materials: water, caustic sodium and waste of aluminum fluoride production are metered simultaneously into the reactor with continuous stirring and heating. The contents of the reactor are kept at boiling point (95 ° C) with constant stirring and atmospheric pressure (0.98-1.013). Yu Pa. This mode in the reactor is maintained until the suspension turns into a clear solution, which indicates complete dissolving silica with the formation of liquid glass. The duration of this mode is 45 minutes, after which they stop mixing and heat supply to the reactor. The resulting liquid glass has a density of g / cm, and silicate module 2, b5. The amount of insoluble residue wt.% Compared with the amount of the original waste, which corresponds to 94.5 yield of the finished product. Similarly prepared another 9 compositions of liquid glass. The table shows the technological parameters of the production of liquid glass according to the proposed method, as well as the main indicators characterizing the properties of the obtained liquid glass.

For the preparation of glass, composition 7 uses aluminum fluoride production waste, the content of silica in which is 90.8 masD, and in compositions 9 and 10 it is the same from production of aluminum fluoride containing free silicon dioxide 63 and 60 ac.%. The duration of dissolution of silicon dioxide in alkaline solution with the formation of liquid glass varies from 5 to 90 minutes depending on the ratio of the solid and liquid phases, the silicate module, as well as the ratio of the solid and liquid phases, and varies from 95 to 105 ° C. These tables indicate that the yield of the finished product of liquid glass is 85-98, and the product has the following properties: a density of up to 1.45 G / CM, and a silicate module of up to 3.2A, preferably 2.6-2.8, which corresponds to requirements GOST 13078-67 Sodium glass liquid.

The proposed method eliminates the process of grinding the raw rock, reduces the consumption of alkali by 2 times, expensive autoclave equipment is replaced by a reactor operating

0 at atmospheric pressure, which reduces fuel consumption. In addition, the insoluble residue (sediment) is minimized, the duration of the liquid glass production process is halved. All this leads to cheaper, simpler technological process, reducing its duration, increasing the service life of equipment, reducing production costs by 25-35 - In addition, the use of industrial waste as a silica-containing material helps prevent environmental pollution by organizing waste-free production. .

Claims (1)

1. A method of producing a liquid glass, comprising preparing a suspension of silica-containing amorphous material in alkaline solution, and subsequent hydrothermal treatment, characterized in that, in order to shorten the duration 7 9199928 process, the preparation of suspension using industrial waste carried out from silica-containing production of aluminum fluoride, a material with a particle size of {0.05 -5) in alkaline solution with con-sources of information, the concentration of NaijO in the solution JO-5 taken into account during the examination -7b kg / m with a solid i1 ratio. USSR author's certificate liquid phase}: (5,2-8,14), and hydroter-N272273, cl. From 01 to 33/32, 1970. Maximum processing is carried out at. Melkon n G.S., hydrothermal  and pressure (0.98-1.013) U Pa method of preparing the complex within minutes glass raw materials kanazit on the base2. Spoyob on p. 1, about tl and h and th -ve of rocks and their products perech and with the fact that as a cream-working. Yerevan, Hayastan, .1977, unearthly amorphous material. 2-.