RU2228312C2 - Raw mixture for preparation of a cellular foamed concrete - Google Patents

Abstract

FIELD: building materials industry; production of cellular foamed concrete. SUBSTANCE: the invention is dealt with building materials industry, in particular with preparation of a raw mixture for production of cellular foamed concrete, that may be used for a heating equipment insulation. The technical result is an increase of refractoriness of a material, an opportunity to produce the heat insulating materials with the stable design densities in the range of 300 up to 800 kg / m cu, an opportunity to use alkali silicate (liquid glass) made from microsilica earth with silica module of 2 up to 4, an opportunity of utilization of the industrial waste - microsilica earth and a chamotte, reduction of production cost. A raw mixture for preparation of the foamed concrete, includes a weak soda glass, a silica component, a frothing agent, a hardener - sodium fluosilicate with silica module of 2 up to 4 and a density of 1.35 - 1.45 g / cm cu. In the capacity of a siliceous component they use microsilica earth, in the capacity of frothing agent - frothing agent "Morpen" and additionally - a chamotte at the following retio of the components (in mass %): the indicated soluble silicate (liquid glass) 63.41 - 69.04, microsilica earth 19.02 - 20.71, frothing agent "Morpen" 0.04 - 0.27, sodium fluosilicate - 6.34 - 6.90, a chamotte - 1.90 - 2.07, water - 1.24 - 9.06. EFFECT: the invention allows to increase refractoriness and improve the heat insulating features of the material, to utilize the industrial wastes - microsilica earth and a chamotte, to reduce cost of cellular foamed concrete production. 2 tbl

Description

The invention relates to the production of cellular building materials and can be used to obtain insulating materials for insulation of the surface of thermal equipment.

Known concrete mixture, including liquid glass from a silicate block with a silicate module of 2.6-3, ground quartz sand as a siliceous component, sodium silicofluoride, additive, foaming agent and water [RF Patent No. 2125976, IPC C 04 V 28/26] .

Materials from a known concrete mixture are non-heat resistant and have unstable mean density values. Known concrete mixture as a siliceous component contains quartz sand, which is subjected to prolonged grinding, which increases the preparation time of the mixture and requires additional energy consumption. When reproducing the specified composition using liquid glass from silica fume [RF Patent No. 2056353, IPC C 04 V 28/04] and silica fume as a siliceous component, it is impossible to obtain thermal insulation materials.

The technical result from the use of the invention: increasing the heat resistance of the material, the possibility of obtaining heat-insulating materials with stable design densities from 300 to 800 kg / m ³ , the possibility of using liquid glass from silica fume with silicate module from 2 to 4, the possibility of using industrial waste - silica fume and fireclay, cheaper production.

The technical result is achieved in that the raw material mixture for the manufacture of foam concrete, including liquid sodium glass, a siliceous component, a foaming agent, a hardener - sodium silicofluoride and water, contains liquid sodium glass from silica fume with a silicate module from 2 to 4 and a density of 1.35-1, 45 g / cm ³ , silica fume as a component - silica fume, as a foaming agent - foaming agent "Morpen" and additionally chamotte in the following ratio of components, wt.%:

Specified Liquid Glass 63.41-69.04

Silica fume 19.02-20.71

Foaming agent “Morpen” 0.04-0.27

Sodium silicofluoride 6.34-6.90

Fireclay 1.90-2.07

Water 1.24-9.06

Liquid sodium glass used to produce foam is prepared in a low-energy way by dissolving silica fume in an alkali solution at a temperature of not more than 100 ° C [RF Patent No. 2056353, IPC C 04 V 28/04].

Silica fume is a dispersed waste product for the production of crystalline silicon, characterized by a small particle size (0.1 ... 3 μm) and, as a consequence, a high specific surface area (from 10,000 to 25,000 cm ² / g). Silica fume is deposited in electrostatic precipitators of the gas treatment system of crystalline silicon production furnaces. The chemical composition of silica fume, wt.%: SiO ₂ - 90.0-95.0; Al ₂ O ₃ - up to 0.8; Fe ₂ O ₃ - up to 0.8; CaO - up to 1.6; MgO - up to 1.2; SiC - up to 5.0; C _total - up to 9.0; loss on ignition - up to 20.0.

Ground chamotte of the East Siberian Refractory Plant was used. The chemical composition of chamotte, wt.%: S 0.02; C 0.72; F footprints; CaO 1.44; MgO 0.28; SiO ₂ 39.65; Al ₂ O ₃ 53.65; Fe ₂ O 4.23.

As a foaming agent used "Morpen" (TU 0258-001-01013393-94).

The proposed raw mix is prepared as follows. To obtain foam from liquid glass, 1-7 parts of a working solution of a foaming agent of 1% concentration are mixed in a high-speed forced-action mixer up to 18-20-fold foaming, then 48-54 parts of liquid glass are gradually introduced into the resulting foam and mixing is carried out until the air is evenly distributed pores in the volume of liquid glass for 1-3 minutes. Silica fume, hardener (sodium silicofluoride) and chamotte are introduced into the resulting glass foam. Then the resulting mixture is molded, the products are kept until the stripping strength is set, the stripped material is dried at a temperature of 50-60 ° C for 5-7 hours.

The compositions of the mixtures obtained are shown in table 1, the characteristics of the products from them are given in table 2.

Claims (1)

The raw material mixture for the production of foam concrete, including liquid sodium glass, a silica component, a foaming agent, a hardener - sodium silicofluoride and water, characterized in that it contains liquid silica glass with a silicate module from 2 to 4 and a density of 1.35 - 1.45 g / cm ³ , as a silica component - silica fume, as a foaming agent - foaming agent "Morpen" and additionally chamotte in the following ratio of components, wt.%: Specified Liquid Glass 63.41 - 69.04 Silica fume 19.02 - 20.71 Foaming agent “Morpen” 0.04 - 0.27 Sodium silicofluoride 6.34 - 6.90 Fireclay 1.90 - 2.07 Water 1.24 - 9.06