RU2704085C1 - Artificial porous filler for light concrete - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to the field of production of construction materials, in particular, an analogue of granulated foamed glass-filler of artificial porous, used as a filler in the preparation of light and silicate concrete, as well as fillings for heat insulation of roofs, walls, coverings, floors of lower floors of buildings and structures for various purposes. Filler porous for light concrete contains the following, wt%: thermal power plant slag 35–40, scrap glass 37–42, sodium liquid glass 10, glycerine 4, crystalline decahydrate of sodium tetraborate 5, water 4.

EFFECT: reduced foaming temperature up to 800–830 °C and foaming time to 15–20 minutes, recycling wastes.

1 cl, 1 tbl, 2 ex

Description

The invention relates to the production industry of building materials, in particular, an analog of granular foam glass - porous artificial aggregate used as aggregate in the preparation of light concrete according to GOST 25820 and silicate concrete according to GOST 25214, as well as backfill for thermal insulation of roofs, walls, floors, floors lower floors of buildings and structures for various purposes.

Known composite mixture for the production of granular foam glass (RF patent No. 2287495, published on November 20, 2006, bull. No. 32, IPC С03С 11/00), which includes glass breakage (we have glass cullet), CHP slag (we have TPP slag), soluble glass and dust of electrostatic precipitators of silicon production in the following ratio of components, wt. %:

Slag CHP 21.5-23 Dust of electrostatic precipitators silicon production 3.0-5.0 Soluble glass 7.0-8.0 Glass break rest

The disadvantage is the high foaming temperature of 1003-1063 ° C.

Also known is porous aggregate for lightweight concrete and heat-insulating fillings (RF patent No. 2604527, publ. 10.12.2016, bull. No. 34, IPC С04В 18/10), where cullet, glycerin, TPP slag, boric acid are used as raw materials for the charge. in the following ratio, wt. %:

Slag TPP 50-60 Cullet 30-40 Glycerol four Boric acid 6

The disadvantage is the high foaming temperature of 850-870 ° C.

The closest in composition is artificial porous glass gravel (RF patent No. 2604731, publ. 10.12.2016, bull. No. 34, IPC С03С 11/00, С03В 19/08) containing as raw materials: TPP slag, cullet, soluble glass (we have liquid sodium glass), glycerin in the following ratio, wt. %:

Slag TPP 25-35 Cullet 65-55 Glycerol 8 Soluble glass 2

The disadvantage is the high foaming temperature of 850-870 ° C and the foaming time of 30 minutes.

The objective of the invention is to reduce the temperature and time of foaming and resource consumption of the technology for the production of artificial porous aggregate for lightweight concrete without compromising its thermophysical properties (thermal conductivity, bulk density and compressive strength), reducing the cost of its production and utilization of TPP slag.

The technical result of the invention is to reduce the foaming temperature to 800-830 ° C and the foaming time to 15-20 minutes.

The problem is solved by introducing into the aggregate artificial porous for light concrete slag TPP, cullet, sodium liquid glass, crystalline sodium tetraborate decahydrate, glycerol and water in the following ratio, wt. %:

Slag TPP 35-40 Cullet 37-42 Liquid sodium glass 10 Crystalline tetraborate decahydrate 5 sodium Glycerol four Water four

To reduce the temperature and foaming time, crystalline sodium tetraborate decahydrate is introduced into the composition of artificial porous for light concrete aggregates, which contributes to the melting of the mixture at low temperatures, reduces the melt viscosity and prevents devitrification.

The production process of artificial porous aggregate for lightweight concrete involves the following technological stages: preparation of the mixture, molding of the semi-finished granules and heat treatment of the granules. To prepare the charge, the slag of a thermal power plant and a cullet are ground separately in a ball mill until a particle size (fraction) of not more than 0.1 mm is reached. Next, the TPP slag, cullet, crystalline sodium tetraborate decahydrate and sodium liquid glass are mixed in the mixer according to the developed recipe for at least 15 minutes. The prepared mixture is granulated on a plate granulator with irrigation with an aqueous solution of sodium liquid glass to form spherical semi-finished granules from 5 to 15 mm in diameter. Next, the semi-finished granules are dried at a temperature of from 250 to 400 ° C for at least 10 minutes in a drum dryer and sprinkled with kaolin (2-3% by weight of the granules) to prevent the granules from sticking together during heat treatment. Semi-finished granules are loaded into a rotary kiln with a cooler for heat treatment, foaming is carried out in the direction of rotation of the granules in the first half of the furnace at a temperature of 800-830 ° C for 15-20 minutes, then the granules are gradually cooled in the second half of the furnace in the temperature range 600-300 ° C for fixing the structure of the material.

As a result, we obtain porous artificial aggregate for lightweight concrete, characterized by low bulk density and thermal conductivity at sufficiently high compressive strength.

The table shows the thermophysical properties of artificial porous aggregate for lightweight concrete.

Example No. 1.

To obtain a mixture of artificial porous aggregate for lightweight concrete, the following materials are used as raw materials: TPP slag, cullet, liquid sodium glass, crystalline sodium tetraborate decahydrate, glycerin, and water. The composition of the artificial porous aggregate for lightweight concrete in this case is as follows (composition No. 1), wt. %:

Slag TPP 35 Cullet 42 Liquid sodium glass 10 Crystalline tetraborate decahydrate 5 sodium Glycerol four Water four

The production process of artificial porous aggregate for lightweight concrete involves the following technological stages: preparation of the mixture, molding of the semi-finished granules and heat treatment of the granules. To prepare the charge, the slag of a thermal power plant and a cullet are ground separately in a ball mill until a particle size (fraction) of not more than 0.1 mm is reached. Next, the TPP slag, cullet, crystalline sodium tetraborate decahydrate and sodium liquid glass are mixed in the mixer according to the developed recipe for at least 15 minutes. The prepared mixture is granulated on a plate granulator with irrigation with an aqueous solution of sodium liquid glass to form spherical semi-finished granules from 5 to 15 mm in diameter. Next, the semi-finished granules are dried at a temperature of from 250 to 400 ° C for at least 10 minutes in a drum dryer and sprinkled with kaolin (2-3% by weight of the granules) to prevent the granules from sticking together during heat treatment. Semi-finished granules are loaded into a rotary kiln with a cooler for heat treatment, foaming is carried out in the direction of rotation of the granules in the first half of the furnace at a temperature of 800 ° C for 15 minutes, then the granules are gradually cooled in the second half of the furnace in the temperature range of 600-300 ° C to fix the structure material.

Example No. 2.

To obtain a mixture of artificial porous aggregate for lightweight concrete, the following materials are used as raw materials: TPP slag, cullet, liquid sodium glass, crystalline sodium tetraborate decahydrate, glycerin, and water. The composition of the artificial porous aggregate for lightweight concrete in this case is as follows (composition No. 2), wt. %:

Slag TPP 40 Cullet 37 Liquid sodium glass 10 Crystalline tetraborate decahydrate 5 sodium Glycerol four Water four

The production process of artificial porous aggregate for lightweight concrete involves the following technological stages: preparation of the mixture, molding of the semi-finished granules and heat treatment of the granules. To prepare the charge, the slag of a thermal power plant and a cullet are ground separately in a ball mill until a particle size (fraction) of not more than 0.1 mm is reached. Next, the TPP slag, cullet, crystalline sodium tetraborate decahydrate and sodium liquid glass are mixed in the mixer according to the developed recipe for at least 15 minutes. The prepared mixture is granulated on a plate granulator with irrigation with an aqueous solution of sodium liquid glass to form spherical semi-finished granules from 5 to 15 mm in diameter. Next, the semi-finished granules are dried at a temperature of from 250 to 400 ° C for at least 10 minutes in a drum dryer and sprinkled with kaolin (2-3% by weight of the granules) to prevent the granules from sticking together during heat treatment. Semi-finished granules are loaded into a rotary kiln with a cooler for heat treatment, foaming is carried out in the direction of rotation of the granules in the first half of the furnace at a temperature of 830 ° C for 20 minutes, then the granules are gradually cooled in the second half of the furnace in the temperature range of 600-300 ° C to fix the structure material.

Properties of synthesized artificial porous aggregate for lightweight concrete

Claims (2)

Artificial porous aggregate for lightweight concrete containing TPP slag, cullet, soluble glass, glycerin, characterized in that it additionally contains crystalline sodium tetraborate decahydrate and water, and liquid sodium glass is used as soluble glass in the following ratio, wt.%: Slag TPP 35-40 Cullet 37-42 Liquid sodium glass 10 Crystalline tetraborate decahydrate 5 sodium Glycerol four Water four