RU2574438C1 - Composition for production of heat resistant concretes - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: composition for heat-resistant concretes contains, wt %: spent catalyst IM-2201 10-15, crushed stone from carbonate rocks of fraction 5-10 mm 33-40, sand with modulus of fineness 1.68 10-13, H₃PO₄ 10-15, slurry of carnallite chlorates produced from the floatation enrichment of titanium-magnesium ores with content, wt %: SiO₂ 12.8; Al₂O₃ 19.4; Fe₂O₃ 19.8; CaO 16.4; MgO 5.2; TiO₂ 6.4; loss on ignition 20 - 24-30.

EFFECT: increased strength limit under compression and heat resistance of heat resistant concretes.

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Description

The invention relates to the field of building materials, in particular the production of heat-resistant concrete based on chemical binders. Chemical binders used in heat-resistant concrete include liquid glass, silicate block (a transparent glassy alloy of alkaline silicates - semi-finished liquid glass) and phosphate bonds.

Known compositions for producing porous aggregates (for concrete) based on chemical binders of the following composition, wt.%: Water glass - 45-65; sodium chloride - 5-15; the waste of a mining and processing factory in coal enrichment - 15-20; inter-shale clay formed during the extraction of oil shale -15-20 (RF patent No. 2440312, IPC C04B 14/24. Composition for the production of porous aggregate. / Abdrakhimova ES, Roshchupkina I.Yu., Abdrakhimov VZ, Kulikov V.A .; applicant and patent holder Samara State Aerospace University named after academician S.P. Korolev. - No. 201022114, application.

The disadvantage of this composition is the relatively low strength of 2.65-2.75 MPa.

Closest to the invention is a composition for producing heat-resistant concrete (composites), comprising the following components, wt.%: Spent catalyst IM-2201 - 10-15; crushed stone - 33-40; sand - 10-13; H ₃ PO ₄ - 10-15; slag from the smelting of ferrotitanium with a content, wt.%: SiO ₂ - 2.5; Al ₂ O ₃ - 72.18; TiO ₂ - 10.2; Fe ₂ O ₃ - 0.30; CaO - 11.4; MgO - 3.3 - 24-30 (RF patent No. 2521005, IPC C04B 28/34. Composition for the manufacture of heat-resistant composites. / Abdrakhimova E.S., Roshchupkina I.Yu., Abdrakhimov V.Z., Kolpakov A.V. .; applicant and patent holder Samara State Aerospace University named after SP Korolev. - No. 201312609, application. January 21, 2013; publ. June 27, 2014. Bull. No. 18) [2].

The disadvantage of this composition is the relatively low compressive strength after hardening and heating to a temperature of 1200 ° C and low heat resistance.

The objective of the invention is to improve the quality of heat-resistant concrete.

The technical result of the invention is to increase the compressive strength and heat resistance of heat-resistant concrete (composites).

The specified technical result is achieved by the fact that in the known composition, including spent catalyst IM-2201, crushed stone from carbonate rocks of a fraction of 5-10 mm, river sand with a particle size modulus of 1.68 and N ₃ PO ₄ , an additional slurry of carnallite chlorates formed during flotation concentration of titanium-magnesium ores with the content, wt.%: SiO ₂ - 12.8; Al ₂ O ₃ - 19.4; Fe ₂ O ₃ - 19.8; CaO - 16.4; MgO - 5.2; TiO ₂ - 6.4; p.p.p. - 20 with the following components, wt.%:

spent catalyst IM-2201 10-15 crushed stone from carbonate rocks of a fraction of 5-10 mm 33-40 river sand with a particle size modulus of 1.68 10-13 H ₃ RO ₄ 10-15 sludge of carnallite chlorates formed during flotation concentration of titanomagnesium ores with a content, wt.%: SiO ₂ - 12.8; Al ₂ O ₃ - 19.4; Fe ₂ O ₃ - 19.8; CaO - 16.4; MgO - 5.2; TiO ₂ - 6.4; p.p.p. - twenty 24-30

Carnallite chlorate slurry is a waste product formed during flotation concentration of titanium-magnesium ores, which is a finely divided mineral product with the following characteristics: dispersion degree - 9500-105090 cm ² / g, ductility number - 12-14, air shrinkage - 6-8%. The chemical composition of the sludge of carnallite chlorates formed during flotation concentration of titanium-magnesium ores is presented in table. one.

For the manufacture of heat-resistant concrete, the following were used:

A) crushed stone that meets the requirements of GOST G 8267-93 "Crushed stone and gravel from dense rocks for construction work. Specifications "M 600, 800-1000, with an average grain density of 2.0 to 2.5 kg / m ³ from carbonate rocks, mined in the Samara region, fractions of 5-10 mm;

B) sand that meets the requirements of GOST 8736-93 "Sand for construction, work. Technical conditions. " Sand, river, mined in the Samara region, had the following indicators: average density in the dry state - 1.5 kg / m ³ ; the content of silty, dusty and clay particles is more than 0.7% by weight; the true density of river sand is 2.65 g / cm ³ ; the presence of loam, lumps of clay and other clogging impurities no more than - 0.05%; fineness modulus - 1.68.

For the manufacture of heat-resistant concrete, phosphoric acid N ₃ PO _{4 was} used as a binder in its pure form according to GOST 6552-80, the norm was pure (parts) OKP 261213002110. The mass fraction of orthophosphoric acid (H ₃ PO ₄ ) is at least 85%, the density is not less than 1.69 g / cm ³ .

In the proposed compositions (table. 2), as in the prototype, the spent catalyst IM-21 (production waste) was used that meets the requirements of TU 38 L 03544-89. The chemical composition of the catalyst are presented in table. one.

According to TU 38.103544-89 spent catalyst IM-2201 must have the following indicators; the appearance of the powder is gray-green, the bulk density of 1.0-1.5 g / cm ³ ; mass fraction of Al ₂ O ₃ not less than 70%.

Information confirming the possibility of carrying out the invention. The technological process for the production of cementless heat-resistant concrete and the manufacture of products and structures from them includes the preparation of molding materials, molding of products and heat treatment.

It should be noted that for their hardening and a set of brand strength, heat-resistant concrete requires special heat treatment.

For phosphoric acid concrete with the components shown in table. 2 - heating to 500 ° C with a rise in temperature to 200 ° C at a speed of 60 ° C / h and up to 500 ° C - 150 ° C / h, keeping for 4 hours, cooling with the furnace.

In the table. 3 presents the physical and mechanical properties of heat-resistant concrete.

As can be seen from the table. 3 heat-resistant concrete of the proposed compositions has higher rates of mechanical strength and heat resistance than the prototype.

The technical solution obtained using sludge from carnallite chlorates, which is formed during the flotation concentration of titanium-magnesium ores, can significantly increase the mechanical strength and heat resistance of heat-resistant concrete.

The use of technogenic raw materials in obtaining heat-resistant concrete contributes to the disposal of industrial waste, environmental protection and the expansion of the raw material base for building materials,

INFORMATION SOURCES

1. RF patent No. 2440312, IPC С04В 14/24. Composition for the production of porous aggregate. / Abdrakhimova E.S., Roshchupkina I.Yu., Abdrakhimov V.Z., Kulikov V.A .; Applicant and patent holder Samara State Aerospace University named after academician S.P. Queen. - No. 2010122114, declared 05/31/2010; publ. 01/20/2012. Bull. No. 2.

2. RF patent No. 2521005, IPC С04В 28/34. Composition for the manufacture of heat-resistant composites. / Abdrakhimova E.S., Roshchupkina I.Yu., Abdrakhimov V.Z., Kolpakov A.V .; applicant and patent holder Samara State Aerospace University named after S.P. Queen. - No. 2013102609, declared 01/21/2013; publ. 06/27/2014. Bull. Number 18.

Claims (1)

Composition for the manufacture of heat-resistant concrete, including spent catalyst IM-2201, crushed stone from carbonate rocks of a fraction of 5-10 mm, river sand with a particle size modulus of 1.68 and H ₃ PO ₄ , characterized in that it additionally contains a slurry of carnallite chlorates formed during flotation concentration of titanium-magnesium ores with the content, wt.%: SiO ₂ - 12.8; Al ₂ O ₃ - 19.4; Fe ₂ O ₃ - 19.8; CaO - 16.4; MgO - 5.2; TiO ₂ - 6.4; p.p.p. - 20 with the following components, wt.%:
spent catalyst IM-2201 10-15 crushed stone from carbonate rocks of a fraction of 5-10 mm 33-40 river sand with a particle size modulus of 1.68 10-13 H ₃ PO ₄ 10-15 sludge of carnallite chlorates formed during flotation concentration of titanomagnesium ores with a content, wt.%: SiO ₂ - 12.8; Al ₂ O ₃ - 19.4; Fe ₂ O ₃ - 19.8; CaO - 16.4; MgO - 5.2; TiO ₂ - 6.4; p.p.p. - twenty 24-30