RU2627789C1 - Charge for receiving the foam glass - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: charge for obtaining foamed glass contains the following components, wt %: sheet glass battle 94.0-97.0; powder of sewage sludge 1.5-3.5; lithium-cobalt-oxide compound 1.0-3.0. 2 pr.

EFFECT: expansion of raw materials base, decrease in foaming temperature.

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Description

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

Known raw mix for producing foam glass (RF patent No. 2358927 dated 06/20/2009, IPC С03С 11/00), including prepared dispersed glass breakage, ground chalk, red mud in the following ratio of components, wt.%:

Glass break 88.0-93.0 Ground chalk 1.0-2.0 Red mud 6.0-10.0

It is well known that there are specific conditions for the existence of phases of sludge, such as an alkaline medium (pH 11 + 13), temperature fluctuations from -25 to + 35 ° C, the presence of external reagents (sub-sludge water, carbon dioxide, soda in water, atmospheric oxygen, solar radiation). As a result of long-term storage of various types of red mud, a qualitative and quantitative change in the properties of the mud occurs. The disadvantage of the prototype is the inconsistency of the chemical composition of the red mud, which can lead to uneven foaming in the volume of foam glass and to obtain an inhomogeneous structure due to the formation of caverns, uneven volume distribution of pores. In general, this can lead to defectiveness, heterogeneity of the properties of foam glass.

The closest in composition is the raw material mixture for the production of foam glass (RF patent No. 2522606 from 07.20.2014, IPC С03С 11/00), which includes glass breakage, water treatment sludge powder in the following ratio of components, wt.%:

Water Treatment Sludge Powder 1.0-10.0 Glass break rest

The disadvantage of the prototype is the high foaming temperature of the foam glass 940-955 ° C and the need to use more dispersed glass, since the grinding is carried out before passing through a sieve according to GOST No. 3584-53 No. 014 and No. 008 with the number of cells per 1 cm ² , respectively 1890 and 5476 , which generally increases the preparation time for glass breakage and increases the energy consumption spent on its grinding.

The objective of the invention is the expansion of the raw material base, the disposal of sludge from water purification, reducing the resource consumption of the production technology, improving the quality and reducing the cost of foam glass.

The technical result of the invention is to reduce the foaming temperature. This reduction and obtaining a uniform porous structure of foam glass are provided by the introduction of water treatment slurry powder and a lithium-cobalt-oxide compound into the charge mixture.

The technical result is achieved due to the fact that the mixture for producing foam glass as the main raw material component contains sheet glass battle and water treatment sludge powder, and also additionally contains a lithium-cobalt-oxide compound mineralizing additive in the following ratio, wt.%:

Flat glass fight 94.0-97.0 Water Treatment Sludge Powder 1,5-3,5 Lithium cobalt oxide compound 1.0-3.0

As a mineralizing additive that reduces the foaming temperature and improves the quality of the resulting foam glass, use a lithium-cobalt-oxide compound. A foam-glass mixture is prepared containing a sheet glass breakage of 94-97% of the total mass, water treatment slurry powder in an amount of 1.5-3.5% of the total mass and a lithium-cobalt oxide compound in an amount of 1.0-3.0% of total mass. These sludges are formed as a result of the removal of hardness salts during water treatment at thermal power plants.

A decrease in the amount of sludge powder for water treatment in a foam glass batch of less than 1% leads to a decrease in pore formation, and an increase in the lithium-cobalt oxide compound by more than 3% leads to an unjustified consumption of this mineralizing additive, since the necessary properties are not improved, and the cost of foam glass increases.

Thorough mixing is achieved by joint grinding of all components of the charge in ball mills. The components of the mixture are crushed before passing through the mesh No. 02. The mixture containing mixed powders of battle of sheet glass, sludge, water treatment and lithium-cobalt oxide compound is moistened with water to the desired molding moisture content of 1-3% and, using special metal molds, are pressed by semi-dry pressing into blanks having a cube shape. Foam glass blanks are fed into a muffle type electric oven. The billets are heated in the furnace at the foaming temperature, annealed and cooled foam glass. The foaming temperature is selected in the range of 870-880 ° C.

Foam glass with appropriate machining allows to obtain products for various construction purposes, in particular blocks, slabs, bricks, lintels, shaped products, etc., with specified geometric dimensions.

The table of properties of the obtained samples of foam glass is presented.

Examples of specific performance

Example No. 1

The mixture for producing foam glass as raw materials contains the following components: sheet glass breakdown, water treatment sludge powder, lithium-cobalt-oxide compound. The composition of the charge in this case is the following, wt.%:

Flat glass fight 95.8 Water Treatment Sludge Powder 2,3 Lithium cobalt oxide compound 1.9

The mixture is prepared by fine pre-grinding and thoroughly mixing the powder of sludge from water treatment, lithium-cobalt-oxide compound and the battle of sheet glass. Fight sheet glass is ground to a residue of not more than 2% on mesh No. 02. Foam glass mixture is moistened to a moisture content of 1-3%. Next, cube-shaped blanks are molded using special metal molds and placed in an electric muffle furnace, where foaming is carried out at a temperature of 870-880 ° C. The foaming time of the foam glass material is 10-15 minutes The resulting foam glass is annealed at a temperature of 550-600 ° C for 30-40 minutes and cooled in an electric muffle furnace for at least 5-6 hours. The presence in the charge of a larger quantity of powder of sludge from water treatment (2.3%) and lithium-cobalt oxide compounds (1.9%), providing the process of obtaining a uniform porous structure of foam glass and lowering the foaming temperature, makes it possible to obtain high-quality foam glass of this composition at a temperature of 875 ° C during foaming for 10 minutes.

Blanks of foam glass material based on container glass are machined to give them the exact shape and size.

Example No. 2

The mixture for the production of foam glass as raw materials contains the following components: sheet glass battle, water treatment sludge powder; lithium cobalt oxide compound. The composition of the charge for foam glass in this case is the following, wt.%:

Flat glass fight 96.5 Water Treatment Sludge Powder 1.9 Lithium cobalt oxide compound 1,6

The mixture for producing foam glass is prepared according to the standard method described above. The presence in the charge of a small amount of sludge powder of water purification (1.9%) and lithium-cobalt oxide compound (1.6%), which ensure the process of obtaining a uniform porous structure of foam glass and lower the foaming temperature, makes it possible to obtain high-quality foam glass of this composition at a temperature of 880 ° C during foaming for 15 minutes.

Table 1 shows the properties of the obtained foam glass.

Reducing the cost of foam glass is carried out by introducing into the battle charge sheet glass, which has a low cost. The use of water treatment slurries as part of the charge solves the problem of their disposal. These sludges are formed as a result of the removal of hardness salts during water treatment at thermal power plants.

Reducing the foaming temperature of foam glass is ensured by introducing into the composition of the charge powder sludge from water treatment and a mineralizing additive, in particular a lithium-cobalt-oxide compound. The set of physico-chemical properties of this compound allows you to shift the mechanism of sintering of foam glass in the region of lower temperatures 870-880 ° C.

The properties of the obtained foam glass meet the requirements for thermal insulation and structural materials, which allows it to be used in various types of enclosing structures of buildings and structures.

Claims (2)

A mixture for producing foam glass containing glass breakage and water treatment sludge powder, characterized in that it additionally contains a lithium-cobalt-oxide compound mineralizing additive, and sheet glass breakage is used as glass breakage in the following ratio, wt.%: Flat glass fight 94-97 Water Treatment Sludge Powder 1,5-3,5 Lithium cobalt oxide compound 1.0-3.0