RU2515520C1 - Granular foamed slag glass - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to granular foamed slag glass. The granular foamed slag glass is obtained from the following components, wt %: thermal power plant slag 55-70; boric acid 10-20; chalk 1-5; scrap glass 14-25.

EFFECT: wider raw material base, low cost, recycling bottom ash wastes of thermal power plants, lowering foaming temperature to 850-870°C.

3 ex, 1 tbl

Description

The invention relates to the production of building materials, in particular granular foam slag glass, used as an effective heat-insulating material in various building structures for insulation, for example, walls, floors, roofs of industrial and civil buildings.

Known raw material mixture for producing granulated foam glass (RF patent No. 2243174, application 2003124103/03 of July 31, 2003, IPC С03С11 / 00), including glass breakage, CHP slag, binder - soluble glass and pore former - aluminum production slurry in the following ratio of components, wt.%:

Slag CHP 20.0-21.0 Sludge aluminum production 1.0-2.0 Soluble glass 8.0-10.0 Glass break Rest

The disadvantage of this raw material mixture is the presence of hydrophobic carbon particles in the sludge, which does not allow the introduction of a large amount of blowing agent and, accordingly, reduces the amount of waste used.

The closest in composition is the composite mixture for the production of granulated foam glass (RF patent No. 2287495. Application 3: 2005109984/03, 06.04.2005, IPC C03C 11/00), which includes glass breakage, CHP slag, soluble glass and dust from silicon-based electrostatic precipitators at 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 of the prototype is the high foaming temperature of 1003-1063 ° C.

The objective of the invention is to simplify the technology of foam slag glass, while maintaining the quality of the product.

The technical result of the invention is to reduce the foaming temperature to 850-870 ° C, depending on the amount of TPP slag in the composition of foam slag glass, reducing the resource consumption of foam slag glass technology, due to the expansion of the raw material base, cost reduction, utilization of TPP ash and slag waste.

The technical result is achieved by introducing into the composition of granular foam slag glass as the main raw material component of the slag waste TPP (slag TPP) in the following ratio, wt.%:

Slag TPP 55-70 Boric acid 10-20 a piece of chalk 1-5 Cullet 14-25

The process of producing foam slag glass includes the following stages:

- preparation of the mixture; granule molding;

- foaming;

- annealing;

The mixture for granulated foam slag glass is prepared by fine grinding and thoroughly mixing the slag of thermal power plants, boric acid, chalk (blowing agent) and cullet. Thorough mixing is achieved by joint grinding of all components of the charge in ball mills. Grinding should be done until a specific surface area of 400-600 m ² / kg is reached. Humidity of the mixture up to 1%.

The prepared mixture is granulated on a plate granulator with irrigation with an aqueous solution of soluble glass, the granules are dried on a belt-mesh dryer at a temperature of 400 ° C to a moisture content of 2%. The obtained granules are transferred to a foaming muffle furnace heated to 500 ° C. In the furnace chamber, the molds are mounted in a zone of constant temperatures.

The foaming temperature may vary between 850-870 ° C, depending on the amount of TPP slag in the composition of granular foam slag glass. Foaming time - 30 minutes The foaming period is followed by a quench step to fix the structure of the material. Since the surface layers may be supercooled at this stage, a stabilization step is provided at a temperature of about 600 ° C.

After exposure at 600 ° C for 30-40 minutes, the oven is turned off. The annealing of granular foam slag glass occurs during spontaneous cooling of an electric muffle furnace for at least 4-5 hours.

The table shows the properties of the synthesized granular foam slag glass.

Example No. 1.

To obtain a mixture of granulated foam slag glass, the following materials are used as raw materials: chalk, cullet, boric acid, and TPP slag. The composition of the granulated foam slag glass in this case is as follows, wt.%:

Slag TPP 66.6 Boric acid 14.3 a piece of chalk 4.8 Cullet 14.3

The mixture for granulated foam slag glass is prepared by fine grinding and thoroughly mixing the slag of thermal power plants, boric acid, chalk (blowing agent) and cullet. The foaming temperature may vary between 850-870 ° C. Foaming time - 30-40 minutes. After exposure at 600 ° C for 30-40 minutes, the oven is turned off. Annealing of foam slag glass granules occurs during spontaneous cooling of an electric muffle furnace for at least 4-5 hours.

Example No. 2.

To obtain a foam slag glass mixture, the following materials are used as raw materials: chalk, cullet, boric acid, TPP slag. The composition of foam slag glass in this case is the following, wt.%:

Slag TPP 57.1 Boric acid 14.3 a piece of chalk 4.8 Cullet 23.8

The mixture for granulated foam slag glass is prepared by fine grinding and thoroughly mixing the slag of thermal power plants, boric acid, chalk (blowing agent) and cullet. The foaming temperature may vary between 850-870 ° C. Foaming time - 30-40 minutes. After exposure at 600 ° C for 30-40 minutes, the oven is turned off. Annealing of foam slag glass granules occurs during spontaneous cooling of an electric muffle furnace for at least 4-5 hours.

Example No. 3.

To obtain a foam slag glass mixture, the following materials are used as raw materials: chalk, cullet, boric acid, TPP slag. The composition of foam slag glass in this case is the following, wt.%:

Slag TPP 61.9 Boric acid 14.3 a piece of chalk 4.8 Cullet 19.0

The mixture for granulated foam slag glass is prepared by fine grinding and thoroughly mixing the slag of thermal power plants, boric acid, chalk (blowing agent) and cullet. The foaming temperature may vary between 850-870 ° C. Foaming time - 30-40 minutes. After exposure at 600 ° C for 30-40 minutes, the oven is turned off. Annealing of foam slag glass granules occurs during spontaneous cooling of an electric muffle furnace for at least 4-5 hours.

Properties of synthesized granular foam slag glass Composition number Water absorption,% Density, ρ * 10 ^-3 kg Tensile strength R _compress MPa one 17.97 0.385 1.13 2 19.38 0.378 1.00 3 37.00 0.365 1.16

Claims (1)

Granular foam slag glass containing TPP slag, cullet, blowing agent, characterized in that it additionally contains boric acid, and chalk in the following ratio, wt.%:
Slag TPP 55-70 Boric acid 10-20 a piece of chalk 1-5 Cullet 14-25