RU2470879C1 - Foamed glass based on thermal power plant slag - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to structural materials and specifically to the technology of producing efficient heat insulation materials. The slag-based foamed glass contains the following in wt %: thermal power plant slag 60-70, borax 10-20, graphite 1-5, scrap glass 15-25.

EFFECT: low foaming temperature, low cost of production, simple technology of production, wider raw material base, recycling thermal power plant wastes.

3 ex, 1 tbl

Description

The invention relates to construction materials, and in particular to a technology for the manufacture of effective heat-insulating materials.

Known raw material mixture for the production of granulated foam glass (RF patent No. 2243174), including glass breakage, CHP slag, a binder - soluble glass and a pore former - aluminum sludge in the following ratio of components, wt.%:

Slag CHP 20.0-21.0 Sludge aluminum 1.0-2.0 production 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), which includes glass breakage, CHP slag, soluble glass and dust from silicon-based electrostatic precipitators 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 of the prototype is the high foaming temperature of 1003-1063 ° C.

The objective of the invention is to reduce the foaming temperature, reduce the resource consumption of foam glass technology based on TPP slag (foam slag glass) without compromising its quality.

The technical result of the invention is to expand the raw material base, reduce production costs, utilize ash and slag waste from TPPs, reduce the foaming temperature to 900-950 ° C, depending on the amount of TPP slag in the composition of foam slag glass, and simplify the technology for producing foam and slag glass.

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

Slag TPP 60-70 Borax 10-20 Graphite 1-5 Cullet 15-25

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

- preparation of the mixture;

- foaming;

- annealing;

- mechanical processing of blocks.

The foam slag glass mixture is prepared by fine grinding and thorough mixing of TPP slag, borax, pore former (graphite) and cullet. Thorough mixing is achieved by joint grinding of all components of the charge in ball mills. Grinding should be carried out until a specific surface area of 400 ... 600 m ² / kg is reached. During the grinding process, the mixture is moistened to 1%.

The preparation of foaming molds involves cleaning and coating their inner surface with a chalk or kaolin slurry to prevent glass from sticking to the metal.

The prepared charge for foam slag glass is uniformly loaded into molds, occupying 30 ... 50% of their volume, and the mixture is manually compacted with a punch, trying to use constant pressure. The molds are closed and transferred to a foaming muffle furnace heated to 500 ... 600 ° C. In the furnace chamber, the molds are mounted in a zone of constant temperatures.

The foaming temperature may vary between 900-950 ° C, depending on the amount of TPP slag in the foam slag glass. Foaming time - 10 ... 30 min. 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. Annealing of foam slag glass blocks occurs during spontaneous cooling of an electric muffle furnace for at least 4 ... 5 hours

After removing the foam slag glass blocks from the molds, they are filmed to give the exact shape and size.

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

Example No. 1

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

Slag TPP 66.6 Borax 14.3 Graphite 4.8 Cullet 14.3

The foam slag glass mixture is prepared by fine grinding and thorough mixing of TPP slag, borax, pore former (graphite) and cullet. The prepared charge for foam slag glass is uniformly loaded into molds, occupying 30 ... 50% of their volume, and the mixture is manually compacted with a punch. The molds are closed and transferred to a foaming muffle furnace heated to 500 ... 600 ° C. The foaming temperature can vary between 900-950 ° C, depending on the amount of TPP slag in the foam slag glass. Foaming time - 10 ... 30 min. The foaming period is followed by a quench step to fix the structure of the material. After exposure at 600 ° C for 30 ... 40 minutes, the oven is turned off. Annealing of foam slag glass blocks occurs when the electric muffle furnace is spontaneously cooled for at least 4 ... 5 hours. After removing the foam slag glass blocks from the molds, they are filmed to give an exact shape and size.

Example No. 2

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

Slag TPP 60 Borax 11,4 Graphite 4.8 Cullet 23.8

A mixture for foam slag glass is prepared by fine grinding and thoroughly mixing the slag of a thermal power plant, borax, pore former (graphite) and cullet. The prepared charge for foam slag glass is uniformly loaded into molds, occupying 30 ... 50% of their volume, and the mixture is manually compacted with a punch. The molds are closed and transferred to a foaming muffle furnace heated to 500 ... 600 ° C. The foaming temperature can vary between 900-950 ° C, depending on the amount of TPP slag in the foam slag glass. Foaming time - 10 ... 30 min. The foaming period is followed by a quench step to fix the structure of the material. After exposure at 600 ° C for 30 ... 40 minutes, the oven is turned off. Annealing of foam slag glass blocks occurs when the electric muffle furnace is spontaneously cooled for at least 4 ... 5 hours. After removing the foam slag glass blocks from the molds, they are filmed to give an exact shape and size.

Example No. 3

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

Slag TPP 61.9 Borax 14.3 Graphite 4.8 Cullet 19.0

The foam slag glass mixture is prepared by fine grinding and thorough mixing of TPP slag, borax, pore former (graphite) and cullet. The prepared charge for foam slag glass is uniformly loaded into molds, occupying 30 ... 50% of their volume, and the mixture is manually compacted with a punch. The molds are closed and transferred to a foaming muffle furnace heated to 500 ... 600 ° C. The foaming temperature may vary between 900-950 ° C, depending on the amount of TPP slag in the foam slag glass. Foaming time - 10 ... 30 min. The foaming period is followed by a quench step to fix the structure of the material. After exposure at 600 ° C for 30 ... 40 minutes, the oven is turned off. Annealing of foam slag glass blocks occurs when the electric muffle furnace is spontaneously cooled for at least 4 ... 5 hours. After removing the foam slag glass blocks from the molds, they are filmed to give an exact shape and size.

Properties of synthesized foam glass based on TPP slag Composition number Water absorption B * 10 ^-3 kg Bulk weight ρ * 10 ^-3 kg Tensile strength R _compress MPa one 0.104 0.285 2,338 2 0,075 0.296 1,168 3 0,089 0.290 1,753

Claims (1)

Foam slag glass containing TPP slag, cullet, blowing agent, characterized in that it additionally contains borax, and graphite in the following ratio, wt.%: Is used as a blowing agent.
TPP slag 60-70 borax 10-20 graphite 1-5 cullet 15-25