RU2228313C2 - Raw mixture for preparation of a foamed concrete - Google Patents

Abstract

FIELD: building materials industry; production of cellular foamed concrete. SUBSTANCE: the invention is dealt with production of cellular building materials and may be used for production of the heat-insulating-constructional and heat-insulating materials at manufacturing elements of buildings and structures in industrial and civil engineering. Technical result is improvement of physical and mechanical characteristics of the 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, decreased time of the mixture preparation, decrease of power consumption, an opportunity of utilization of soluble silicate from microsilicon earth with silica module from 2 up to 4, an opportunity of utilization of microsilicon earth - a crystalline silicium production waste, decrease of price of production. The raw mixture for preparation of the foamed concrete, including a weak soda glass, a siliceous component, a frothing agent, a hardener - sodium fluosilicate and water, contains a weak soda glass from microsilicon earth with silica module of 2 up to 4 and a density 1.35 - 1.45 g / cm cu. In the capacity of a siliceous component they use microsilicon earth - a waste of crystalline silicium production; in the capacity of a frothing agent - a technical soap "Taiga" with addition of a lump quicklime at the following ratio of components, (in mass %): the indicated soluble silicate 59.52 - 68.44, microsilicon earth 17.86 - 20.53, a technical soap "Taiga" - 0.10 - 0.71, sodium fluosilicate - 5.95 - 6.84, lump quicklime - 1.79 - 2.05, water - 2.04 - 14.17. EFFECT: improved physical and mechanical characteristics of the material, produced the heat insulating materials with the stable design densities, decreased power consumption and time of the mixture preparation, utilization of a crystalline silicium production waste - microsilicon earth. 2 tbl

Description

The invention relates to the production of cellular building materials and can be used to obtain heat-insulating structural and heat-insulating materials in the manufacture of elements of buildings and structures in industrial and civil engineering.

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 2125976, IPC C 04 B 28/26].

Known concrete mixture as a siliceous component contains quartz sand, grinding of which increases the preparation time of the mixture and requires additional energy consumption. A heat-insulating material from a known concrete mixture has unstable mean density values. When reproducing the specified composition using liquid glass from silica fume [RF Patent 2056353, IPC С 04 В 28/04] and silica fume as a siliceous component, it is impossible to obtain heat-insulating materials.

The technical result from the use of the invention: improving the physico-mechanical characteristics of the material, the possibility of obtaining heat-insulating materials with stable design densities from 300 to 800 kg / m ³ , reducing the time of preparation of the mixture, reducing energy consumption, the possibility of using water glass from silica fume with silicate module from 2 to 4, the possibility of using silica fume - a waste of the production of crystalline silicon, 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, hardener sodium silicate 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 , as a siliceous component - a waste product of crystalline silicon production - microsilica, as a foaming agent - technical soap "Taiga" and additionally lime-kipelka in the following ratio of comp onents, wt.%:

Specified Liquid Glass 59.52-68.44

Silica fume 17.86-20.53

Technical soap "Taiga" 0.10-0.71

Silicon fluoride 5.95-6.84

Boiling lime 1.79-2.05

Water 2.04-14.17

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 result, 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.

As a foaming agent used technical soap “Taiga”.

The proposed raw mix is prepared as follows. To obtain foam from liquid glass, 1-6.5 parts of a working solution of a foaming agent of 4% concentration are mixed in a high-speed forced-action mixer up to 10-12 times foaming, then 26.5-32 parts of liquid glass are gradually introduced into the resulting foam and produced mixing until a uniform distribution of air pores in the volume of liquid glass for 1-3 minutes. Silica fume, hardener (sodium silicofluoride) and lime-lime are introduced into the obtained liquid 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 products from them are in table 2.

Claims (1)

The raw material mixture for the manufacture 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 siliceous component - a waste product of crystalline silicon production - silica fume, as a foaming agent - technical soap "Taiga" and additional lime lime in the following ratio, wt.%: Specified liquid glass 59.52 - 68.44 Silica fume 17.86 - 20.53 Technical soap “Taiga” 0.10 - 0.71 Silicon fluoride 5.95 - 6.84 Boiling lime 1.79 - 2.05 Water 2.04 - 14.17