RU2592927C1 - Composition for producing heat-resistant concrete - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to construction materials, particularly to production of heat-resistant concrete based on chemical binders in form of phosphate binders. This is achieved by adding to composition based on phosphoric acid, slag from smelting of ferrotitanium, sand and nepheline sludge waste of spent catalyst containing, %: SiO₂ - 31.9; Al₂O₃ - 5.8; Fe₂O₃ - 4.3; CaO - 55.7; MgO - 1.4; R₂O - 1.8 and SO₃ - 0.5, at following ratio of components, wt.%: spent catalyst IM-2201 10-15, nepheline dump sludge 33-40, sand 10-13, H₃PO₄ 10-15, slag from smelting ferrotitanium 24-30.

EFFECT: technical result is increasing ultimate compression strength and heat resistance of refractory concrete.

1 cl, 4 tbl

Description

The invention relates to the field of building materials, in particular the production of heat-resistant concrete based on chemical binders. Chemically binders used in heat-resistant concrete include water glass, silicate block (a transparent glassy alloy of alkaline silicates - prefabricated water 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 production of oil shale - 15-20 / US Pat. Russian Federation 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 05/31/20910; publ. 01/20/2012; bull. No. 2 / [1].

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 / US Pat. Russian Federation 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. No. 18 / [2].

The disadvantage of this composition is a 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 (composite).

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 the spent catalyst IM-2201, sand, slag from the smelting of ferrotitanium and H ₃ PO ₄ , nepheline dump slurry is additionally introduced with the content,%: SiO ₂ - 31.9; Al ₂ O ₃ - 5.8; Fe ₂ O ₃ - 4.3; CaO - 55.7; MgO - 1.4; R ₂ O - 1.8 and SO ₃ - 0.5 in the following ratio of components, wt. %:

spent catalyst IM-2201 10-15 nepheline waste slurry 33-40 sand 10-13 H ₃ RO ₄ 10-15 Ferrotitanium smelting slag 24-30

Nepheline sludge (belitic) is a sandy mixture with pronounced astringent properties. The nepheline sludge of the Achinsk Alumina Refinery (RUSAL Achinsk OJSC, Krasnoyarsk Territory) is the tail product of the Kiy-Shaltyr nepheline and limestone of the Mazul mine, obtained after the extraction of alumina and soda products.

The raw material base of the Achinsk alumina refinery (AGK) is made up of the Kiya-Shaltyrsky nepheline mine (Kemerovo region), where ore is mined by open pit mining, and the Mazulsky limestone mine (Achinsk). AGK works on a unique technology developed by the All-Russian (All-Union) Aluminum-Magnesium Institute (VAMI). It is based on the use of the method of sintering nepheline ore with limestone and subsequent hydrochemical processing of cake. AGK is the only enterprise in the world engaged in the industrial processing of nepheline ore. The chemical composition of nepheline dump slurry is shown in table 1.

The phase and mineralogical composition of nepheline dump sludge, wt. %: 85 - Belite (β-2СаО · SiO ₂ ); the total content of impurity phases is 15%, including: 4 - Ca (OH) ₂ , 3 - CaCO ₃ , 2 - hydrocarboaluminate (3CaO · Al ₂ O ₃ · CaCO ₃ · 11H ₂ O), 2 - sodium hydroaluminosilicate (Na ₂ O · Al ₂ O ₃ · 2SiO ₂ · 2H ₂ O), 2 - nepheline, 2 - glass.

The presence in the sludge of minerals with the hydraulic activity of belite (C ₂ S) and their hydrates determines the possibility of obtaining binders - phosphates together with phosphate binders.

The particle size distribution of nepheline sludge is presented in table 2.

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

a) sand that meets the requirements of GOST 8736-93 “Sand for construction work. Technical conditions. " River sand, 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 not 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%; particle size modulus - 1.68;

b) slag from ferrotitanium smelting was used as an aluminum-containing refractory material. Slag has a dense structure, compressive strength of more than 100 MPa, refractoriness above 1770 ° C, temperature under a load of 0.2 MPa above 1700 ° C. The average chemical composition is presented in table 1.

c) as a binder - phosphoric acid N ₃ PO ₄ in its pure form according to GOST 6552-80, norm - pure (h) OKP 26 1213 0021 10. Mass fraction of orthophosphoric acid (H ₃ PO ₄ ) not less than 85%, density not less than 1.69 g / cm ³ ;

d) in the proposed compositions, as in the prototype, the spent catalyst IM-21 (production waste) was used that meets the requirements of TU 38.103544-89. The chemical composition of the catalyst are presented in table 1.

According TU 38.103544-89 spent catalyst IM-2201 should have the following parameters: Appearance powder - gray-green color, a 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 3, heating to 500 ° C with a temperature rise of 200 ° C at a speed of 60 ° C / h and up to 500 ° C-150 ° C / h, keeping for 4 hours cooling along with the oven.

Table 4 presents the physical and mechanical properties of heat-resistant concrete.

As can be seen from table 4, heat-resistant concrete from the proposed compositions has higher rates of mechanical strength and heat resistance than the prototype.

The resulting technical solution when using nepheline dump slurry can improve the mechanical strength and heat resistance of heat-resistant concrete.

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

INFORMATION SOURCES

1. Pat. Russian Federation 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 05/31/20910; publ. 01/20/2012. Bull. No. 2.

2. Pat. RF №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. Claim 01/21/2013; publ. 06/27/2014. Bull. Number 18.

Claims (1)

Composition for the manufacture of heat-resistant concrete, including the spent catalyst IM-2201, sand, slag from the smelting of ferrotitanium and H ₃ PO ₄ , additionally contains nepheline dump slurry with a content,%: SiO ₂ - 31.9; Al ₂ O ₃ - 5.8; Fe ₂ O ₃ - 4.3; CaO - 55.7; MgO -1.4; R ₂ O - 1.8 and SO ₃ - 0.5 in the following ratio of components, wt.%:
spent catalyst IM-2201 10-15 nepheline waste slurry 33-40 sand 10-13 H ₃ RO ₄ 10-15 Ferrotitanium smelting slag 24-30