Raw mixture to obtain granular heat insulating material

FIELD: construction.

SUBSTANCE: raw mixture to obtain a granular insulation material contains, by wt %: microsilica 33.5-45, ash and slag mixture 3.0-14.5, apatite-nepheline ore tailings 25-30, sodium hydroxide (in Na2O equivalent) 22-27, ammonium bicarbonate 0.5-1.5. The invention is evolved in dependent claims.

EFFECT: improvement of strength of granular insulation material while reducing its water absorption, utilization of man-made waste.

4 cl, 1 tbl

 

The invention relates to the composition of the raw mix for the production of building materials, particularly porous artificial products, and can be used in the manufacture of granulated insulating material and very lightweight aggregate for concrete in industrial and civil construction.

In the manufacture of construction products increasingly widespread technogenic raw materials in the form of silica-containing industrial waste mining and metallurgical enterprises. One of the promising areas of application of microsilica is a heat insulating materials using liquid compositions. Thermo insulating materials based on liquid glass are of considerable interest given the current shortage of cement binder, and technologies of their production is simple and does not involve large capital investments. However, the use of technogenic raw materials can not get enough of high performance insulation materials.

Well-known raw material mixture to obtain a granulated insulating material (see P. Gorlov Technology thermal insulation and acoustic materials and products. - M.: Higher school, 1989. - S-180)containing the following components, mA is.%: liquid glass density 1.4-1.45 g/cm 3- 93-95%, fine filler with a specific surface area of 0.2-0.3 m2/g (ash TPP) - 7-5% and gidrofobiziruyuschey additive is a silicone liquid (NGL-94, NGL-10, NGL-11) 0,5-1%). When preparing the raw material mixture is mixed until smooth, serve in droplet form in a solution of calcium chloride with the temperature of 22-30°C and incubated for 40 minutes to form pellets. The obtained raw granules are dried at 85-90°C for 10-20 minutes and then vspuchivajut at 300-450°C for 1-3 minutes. The obtained granulated material steklopor has a strength of 1 to 7 kgf/cm2and high water absorption.

The disadvantages of this raw material mixture are low strength and water resistance of the obtained granulated insulating material. The use of a solution of calcium chloride in the formation of granules of the raw mixture causes corrosion of the equipment used.

Also known raw material mixture to obtain a granulated insulating material (see U.S. Pat. 2452704 of the Russian Federation, IPC C04B 12/04 (2006.01), 2012), including, wt.%: sodium hydroxide - 2-40, waste beneficiation of Apatite-nepheline ore 0,9-10, sand sand - 49-96, silica-containing component is rest. Waste beneficiation of Apatite-nepheline ore contains, wt%: nepheline - 84, feldspar 12, aegirine - 4, hydromica - up to 3, and the other is their impurities. As the silica component used siliceous rock Tripoli. When preparing the raw material mixture is stirred, subjected to spray drying in a counter-current flow of incoming and outgoing air with a temperature of 380 and 115°C, respectively, with the receipt of raw granulate. The last stand for 15 hours and vspuchivajut at a temperature of 630-650°C. the Obtained granulated material had a bulk density 95-130 kg/m3the strength 9-10 kgf/cm2and water absorption ≤5%.

The disadvantages of the known raw mix are low strength heat-insulating material, and a limited number of man-made waste.

The present invention is directed to the achievement of the technical result consists in increasing the strength of the granulated insulating material, ensuring its low water absorption. In addition, the technical result is to expand the resource base and environmental improvement through the use of a larger number of man-made components.

The technical result is achieved by the fact that the raw material mixture to obtain a granular thermal insulating material comprising silica-containing component, the waste beneficiation of Apatite-nepheline ore and sodium hydroxide, according to the invention, the complement is Ino contains ash and slag mixture and ammonium bicarbonate, and as the silica component - fume, in the following ratio, wt.%:

microsilicaa 33.5-45
ash mixture3,0-14,5
waste beneficiation of Apatite-nepheline ore25-30
sodium hydroxide (in terms of Na2O)22-27
bicarbonate ammonium0.5 to 1.5

On the technical achievement of the aims that the microsilica has a composition, wt.%: SiO292,84-93,04, TiO20,47-0,98, Fe2O30,76-1,93, Al2O3of 0.25 to 0.74, Cao 0,59-0,88, K2O 0,23-1,2, MnO 0.04 To 0,30, CuO 0,13-0,26, loss on ignition - the rest.

On the achievement of the technical result is also aimed that ash and slag mixture has a composition, wt.%: SiO252,48-53,44, TiO21,08-1,23, Fe2O313,44-13,74, FeO 1,03-1,93, Al2O317,57-of 18.45, Cao 2,43-2,47, K2O 1,30-1.55V, loss on ignition - the rest.

On the achievement of the technical result is also aimed that the waste beneficiation of Apatite-nepheline ore has a composition, wt.%: SiO235,10-35,98, TiO24,43-4,98, (Fe2O3+FeO) 7,00-12,22, Al2O316,45-16,61, Cao 8,92-9,13, MgO 1,07-1,25, P2O54,05-4,11, Na2O 9,13-10,77, K2O 4,59-of 5.05.

The essential features of the claimed invention, defining the scope of legal protection and sufficient to obtain the above-mentioned technical result function and correlate with the results as follows.

The introduction of modifying additives in the form of ash and slag mixture in the composition of the mixture to obtain a granular insulating material in a quantity 3-14,5 wt.% due to the fact that the presence of such additives leads to the formation of a larger number of closed pores with more durable interporous partitions. This contributes to reducing water absorption and increase the compressive strength. The ash content of the mixture is less than 3 wt.% does not allow to achieve the required strength of the material. When the content of the additive more than 14.5 wt.% increases the viscosity and decreases the ductility of the liquid composition, which leads to an increase in density and poor thermal conductivity of a granular material.

Introduction the composition of the charge ammonium bicarbonate in the amount of 0.5-1.5 wt.% due to the fact that it performs the function of baking powder and can increase bloating granules. It is preferable to use ammonium bicarbonate brand "chemically pure". When the content of ammonium bicarbonate less than 0.5 the AC.% the material is not enough bubbled, that leads to deterioration of thermal conductivity. The content of additives ammonium more than 1.5 wt.% leads to loss of strength of granular material.

Use in the blend of silica fume due to the fact that on the basis of the prepared liquid composition to obtain a granulated material. When the content of silica fume less 33.5 wt.% the result is a material with a lower strength and water resistance. The content of microsilica more than 45 wt.% leads to excessive increase in the density of the liquid composition and complicates the granulation of the material.

Use in the blend waste beneficiation of Apatite-nepheline ore due to the fact that the nepheline-containing wastes are effectively modifying additive that improves the strength characteristics of heat-insulating material. The use of waste beneficiation of Apatite-nepheline ore in quantities of less than 25 wt.% reduce the strength of the granulated insulating material, and the use of nepheline waste in quantities greater than 30 wt.% leads to a decrease of plasticity liquid composition and consequently to a deterioration of distension of the granules, the increase in average and bulk density and lower thermal conductivity of the granular material.

Sodium hydroxide is an alkaline component and use isoamsa in the blend together with silica fume for the preparation of liquid compositions. It meets the requirements of GOST 2263-79 and can be used in aqueous solution in various concentrations, preferably 45% aqueous solution. In the blend sodium hydroxide NaOH contained in the number 22-27 wt.% in terms of Na2O. the Content of sodium hydroxide is less than 22 wt.% leads to a decrease in the viscosity of the liquid-glass composition, and the content of more than 27 wt.% it leads to excessive density, which negatively affects the formation of granules.

The combination of the above features is necessary and sufficient to achieve the technical result of the invention to increase the strength of the granulated insulating material, ensuring its low water absorption, as well as expanding the resource base and improve the environment.

In some cases, of the preferred embodiment of the invention anthropogenic components of the raw material mixture of the following composition.

The silica fume is a waste acid processing of nepheline in OJSC "Apatit" and has the following chemical composition, wt.%: SiO292,84-93,04, TiO20,47-0,98, Fe2O30,76-1,93, Al2O3of 0.25 to 0.74, Cao 0,59-0,88, K2O 0,23-1,2, MnO 0.04 To 0,30, CuO 0,13-0,26, loss on ignition - the rest. Microsilica is a fine light gray powder with a specific surface area 1,72-2,37 m2/g, bulk raft the awn 256-287 kg/m 3and the true density of 2.0-2.17 g/cm3.

Ash mixture is a waste of Apatity CHP. The mixture has a chemical composition, wt.%: SiO252,48-53,44, TiO21,08-1,23, Fe2O313,44-13,74, FeO 1,03-1,93, Al2O317,57-of 18.45, Cao 2,43-2,47, K2O 1,30-1.55V, loss on ignition - the rest. The average specific surface area of the mixture is 0.4 m2/year of Introduction of ash-slag mixture in the charge composition for insulating material leads to an increase in the intensity of the reflexes of silica and compounds of the type aluminosilicates. This can be interpreted as the increase in the content of SiO2in the system of sodium silicate of Na2O·nSiO2and the formation of insoluble aluminosilicate tumors. The introduction of the admixture increases the number of links Si-O-Al-O in the structure of high modulus of liquid glass from silica fume, as well as the emergence of similar linkages due to ion substitution of silicon by aluminum ion. The crystalline phase is represented mainly by cristobalite and quartz.

Waste flotation of Apatite-nepheline ores by JSC "Apatit" has the following chemical composition, wt.%: SiO235,10-35,98, TiO24,43-4,98, (Fe2O3+FeO) 7,00-12,22, Al2O316,45-16,61, Cao 8,92-9,13, MgO 1,07-1,25, P2O54,05-4,11, Na2O 9,13-10,77, K2O 4,59-of 5.05.

The middle portion is Naya surface waste enrichment equal to 0.19 m 2/year of Waste beneficiation of Apatite-nepheline ore contains up to 61,1 wt.% nepheline and their functional properties are not inferior nepheline concentrate. Except nepheline main components of the waste are also aegirine and secondary minerals in nepheline, the content of which is, respectively, wt.%: 10,2-13,0 and 7.5 to 10.2. Secondary minerals are feldspar and Apatite, the content of which is, wt.%: 5.8 to 7.4 and 3,4-5,4.

The above private features of the invention allow to obtain the optimal composition of the raw mix on the basis of technogenic waste while providing a high-strength granular insulating material and low water absorption.

In General, obtaining the raw material mixture according to the invention is as follows. First, cook the mixture by dosing in the specified quantities of its components: microsilica, fly ash mixtures, waste beneficiation of Apatite-nepheline ore, 45% solution of sodium hydroxide and ammonium bicarbonate with the addition of water and stirring for 1.5-3 minutes until a homogeneous suspension. Further hydrothermal treatment at a temperature of 90-95°C and atmospheric pressure for 20-25 minutes. The obtained liquid composition is subjected to granulation plate granulator. Formed syrc the new pellets after drying at room temperature for 6-8 hours optivault silica fume and treated at a temperature of 300-450°C for 20-30 minutes with the swelling of the granules. Then the granules are subjected to intermittent firing at 800-900°C for 1-3 minutes. In the end you get a granular insulating material with a particle size of granules 4-16 mm

The nature and advantages of the claimed raw material mixture to obtain a granulated insulating material can be illustrated by Examples 1-6 of specific performance. The compositions of the raw material mixture to obtain a granular thermal insulating material according to Examples 1-6 and main characteristics of the obtained insulating material shown in the Table.

From the Table it is seen that the proposed raw material mixture to obtain a granular insulating material in comparison with the prototype allows to obtain a material with a higher (2.2-3.3 times) strength and comparable water absorption (≤5%). Use as components of the raw material mixture, a larger number of technogenic wastes allows you to expand the resource base and improve the environment. Granular insulation material from the proposed raw material mixture can be obtained industrially by using standard construction equipment.

Table
Example No.Comp is the components of the raw mix Specifications material
micro-silicaSolola uniform mixturewaste beneficiation of Apatite-nepheline-howl oresodium hydroxidedougle acid ammoniumbulk density, kg/m3strength, kgf/cm2water absorption, %
fraction of granules
8-164-88-164-88-164-8
145,03,027241105112222454,5
240,57,527 241105113262854
336,711,327241106117273043,5
433,514,527241110123283043,5
540,07,525270,5109117252755
635,2 11,330221,511112427284,54

1. The raw material mixture to obtain a granular thermal insulating material comprising silica-containing component, the waste beneficiation of Apatite-nepheline ore and sodium hydroxide, characterized in that it further comprises ash and slag mixture and ammonium bicarbonate, and as the silica component - fume, in the following ratio, wt.%:

microsilicaa 33.5-45
ash mixture3,0-14,5
waste beneficiation of Apatite-nepheline ore25-30
sodium hydroxide (in terms of Na2O)22-27
bicarbonate ammonium0.5 to 1.5

2. Raw mixture according to claim 1, characterized in that the silica fume has a composition, wt.%: SiO292,84-93,04, TiO20,47-0,98 Fe 2O30,76-1,93, Al2O3of 0.25 to 0.74, Cao 0,59-0,88, K2O 0,23-1,2, MnO 0.04 To 0,30, CuO 0,13-0,26, loss on ignition - the rest.

3. Raw mixture according to claim 1, characterized in that the ash-slag mixture has a composition, wt.%: SiO252,48-53,44, TiO21,08-1,23, Fe2O313,44-13,74, FeO 1,03-1,93, Al2O317,57-of 18.45, Cao 2,43-2,47, K2O 1,30-1.55V, loss on ignition - the rest.

4. Raw mixture according to claim 1, characterized in that the waste beneficiation of Apatite-nepheline ore has a composition, wt.%: SiO235,10-35,98, TiO24,43-4,98, (Fe2O3+FeO) 7,00-12,22, Al2O316,45-16,61, Cao 8,92-9,13, MgO 1,07-1,25, P2O54,05-4,11, Na2O 9,13-10,77, K2O 4,59-of 5.05.



 

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2 cl, 1 ex, 1 tbl

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1 tbl

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1 tbl

FIELD: chemistry.

SUBSTANCE: crude mixture for making material which imitates natural stone contains, wt %: mica which is crushed and sieved through sieve N5 5.0-7.0; liquid glass 1.0-1.5; water 29.0-31.0; white portland cement 33.0-35.0; quartz glass which ground and sieved through sieve N 014 21.0-28.5; sodium ethylsiliconate or sodium methylsiliconate 0.5-1.0; at least one component selected from a group comprising chromium oxide, ultramarine, ochre, red oxide, pyrolusite, red lead 0.3-3.0.

EFFECT: high water resistance.

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FIELD: chemistry.

SUBSTANCE: invention relates to inorganic fine materials, specifically to hollow glass-lined pearlite-based microspheres, and can be used in producing microspheres from other acidic hydroalumosilicates. In the method of making hydrophobic light-weight microspherical pearlite-based aggregate, which includes preparing a starting mixture, grinding said mixture, preparing a slurry, simultaneously moulding and drying granules, expanding said granules, the slurry is prepared by combined grinding of pearlite, ascharite, lithium carbonate and strontium carbonate in 2-3% NaOH solution to particle size of less than 5 mcm, with the following ratio of components, wt %: Ascharite - 2-4; lithium carbonate - 0.2-3; strontium carbonate - 0.2-3; pearlite - the balance, and the granules are moulded and dried by feeding the slurry through a sprayer with calibrated orifices into a tower-shaped spray dryer to obtain granules with moisture content of less than 0.9 wt % at the output.

EFFECT: obtaining hardened and hydrophobic granules.

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