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INVENTION
Patent of the Russian Federation RU2231503
METHOD OF PREPARATION OF A REFRACTORY FILLING SOLUTION
The name of the inventor: Sysoev AV (RU); Aminov S.N. (RU); Nakhalov S.A. (RU); Zavadsky K.F. (RU); Rukomoykin A.A.
The name of the patent owner: Open Joint-Stock Company "Siberian-Ural Aluminum Company"
Address for correspondence: 624440, Sverdlovsk Region, Krasnoturinsk, ul. K. Marx, 1, "BAZ-SUAL", BREEZE, ZR. Buckrina
The effective date of the patent: 2001.11.06
The invention relates to the field of metallurgy, can be used in carrying out lining operations of high-temperature metallurgical furnaces with an operating temperature of 800-1700 ° C. Alumoborophosphate concentrate (ABPA) is used as the binding component of the masonry solution. In industry, ABFC is used as a component in the production of refractory bricks and molds (chill molds). Aluminoborophosphate concentrate (ABAP) is diluted with water to a density of 1.35-1.38 g / cm 3 . Composition of the masonry mortar, wt.%: Chamotte bleach MSh-31-64-68, aluminoborophosphate concentrate 29-33, hardener MgO · SiO 2 -3. The use of the invention increases the service life of the lining.
DESCRIPTION OF THE INVENTION
The invention relates to the field of metallurgy and can be used in carrying out lining operations of high-temperature metallurgical furnaces with an operating temperature of 800-1700 ° C.
The strength of the lining under conditions of thermal and mechanical loads, and consequently the life of the metallurgical furnace, depends mainly on the method of preparation and application of masonry solutions intended for bonding standard refractory products (bricks, blocks) to a single thermal protective array of a metallurgical furnace (hereinafter referred to as "lining" ).
A method for preparing a refractory mullite-siliceous masonry mortar on a cement base for the repair of the lining of metallurgical furnaces, for example mine, rotating, mixers and others (Gavrish DI et al. Refractory manufacture, reference book, Vol. 1, M., Metallurgiya, 1965, P. 552-559; Temporary technological instruction VTI 14-345.1-7-91 "Production of mullite-siliceous refractory marl solution" Eastern Institute of Refractories, Ekaterinburg) using the following ingredients, mass%:
Fireclay stink with Al 2 O 3 content - 28-38% of grade МШ-31 GOST 6137-8 70
Portland cement grade 400 GOST-10178-85 28
Liquid glass with a density of 1.37 g / cm 2
(Over 100%) GOST 13078-81 20
Magnesium salt 2
The liquid glass is preliminarily diluted with water to a density of 1.36-1.40 g / cm 2 .
Preparation of the solution is made in a mortar mixer according to the following regime: chamotte mortar and cement are loaded into a mixer, mixed for 1-3 minutes, a liquid glass with a density of 1.37 g / cm is poured in and mixed for 3-5 minutes.
The ready mortar must satisfy the following requirements: mass fraction of Al 2 O 3 , (in terms of calcined substance) - not less than 45%, start of setting - not earlier than two hours, shelf life of the solution - no more than three hours, cooking and use temperature Solution - not less than 5 ° C.
When used, the prepared mortar must be a liquid or semi-liquid consistency.
The consistency of the solution is determined visually.
Lining lining on mullitokremnezmistom solution is made by applying to the contact surface of products with a trowel.
The thickness of the masonry seam should not exceed 2 mm.
The disadvantage of this method is the low service life of the lining - up to 2 months. With prolonged exposure to temperatures above 500-600 ° C, the cement is dehydrated, the phase composition changes and the ligament cementing the filler seeds is weakened. The seam is loosened, which leads to the destruction of the liner.
Known is the method of preparation of clay solutions (Kopeikin VA et al. Refractory solutions on phosphate binders, M., Metallurgy, 1986, pp. 36-37; Strelov KK et al., Theoretical Foundations of Refractory Materials Technology, M ., "Metallurgy", 1996, p. 154-159) with the use of sodium polyphosphate - Na (PO 3 ) n (GOST 20291-80). Their density is 2.48 g / cm 2 , the melting point is 619 ° C.
According to its properties, the refractory masonry mortar based on sodium polyphosphate must meet the following requirements:
- appearance - homogeneous, well-mixed mass without lumps and foreign inclusions;
- viability (suitability for applying it after preparation on the surface of a refractory product) - not less than 4 hours.
Composition of refractory mortar:
- 30 liters of a solution of sodium polyphosphate with a density of 1.35 g / cm 3 (kg / l) are consumed per 100 kg of the MSh-31 flicker.
The solution consumption per 1 m of masonry, depending on its composition, is 190-240 kg.
The required amount of sodium polyphosphate is specified by test batch depending on the purpose of the solution and its consistency, as well as on the dispersion, porosity and moisture of the fillers.
Preparation of the mortar for lining works is carried out as follows: the lump polyphosphate is dissolved in industrial water with a temperature of 10-50 ° C with stirring.
To prepare the solution, the consumption of sodium polyphosphate with a recommended density of 1.35 g / cm 3 is 540 kg per 1 m 3 of water.
The preparation of the phosphate refractory solution is carried out in a mechanical mortar mixer.
The materials are loaded in the following order:
- 1/2 part of a dilute solution of sodium polyphosphate is poured into the solution mixer;
- 1/2 part of the required quantity of powdered fillers is filled and stirring is carried out until a homogeneous mass is obtained.
In the same sequence, the remaining amount of binder and fillers is added. The mass is stirred for 10-15 minutes.
The consistency of the solution can be adjusted during operation, depending on the ease of application of the solution to refractory products and the thickness of the joint.
If the solution is dense, it is additionally diluted with sodium polyphosphate solution, if it is liquid, add the powder filler and mix thoroughly until a homogeneous mass is obtained.
The service life of furnaces lined with sodium polyphosphate is much higher than the lifetime of the above analogues.
The disadvantage of this method of preparing a solution based on sodium polyphosphate is the need to introduce an additional operation - dissolving the solid, glassy sodium polyphosphate in water, which increases the time of preparation of the solution to work, the need for additional equipment, increases the cost of energy resources at a higher cost of sodium polyphosphate compared to the proposed Binding component. In addition, the alkali metal phosphates in aqueous solutions are partially hydrolyzed.
The object of the invention is to eliminate the above disadvantages of the analogue and prototype methods, to increase the service life of the lining of metallurgical furnaces.
The technical result of the invention is an increase in the stability of the lining of metallurgical furnaces due to the use as a binder component of a masonry solution of phosphate binders: aluminoborophosphate concentrate (ABPK).
Phosphate binders are homogeneous systems obtained by dissolving oxide compounds in orthophosphoric acid.
As a binder component, it is proposed to use aluminoborophosphate concentrate (ABA) (TU 113-08-606-87). In industry, ABFC is used as a component in the production of refractory bricks and molds (chill molds).
These specifications apply to the aluminoborophosphate concentrate used as a binder in metallurgical production in the manufacture of molds and rods, in the production of refractory products, in the production of dyes in the production of roofing tiles and colored roofing materials.
As a refractory powder aggregate in phosphate solutions, a blizzard is used in accordance with GOST 6137-80 of grade MSh-31 (or other filler if instructions for use are available).
The hardener to the masonry solution based on ABPK can be taken as a double salt of MgO · SiO 2 in an amount of 3% of the total volume of the solution.
Composition of refractory phosphate masonry mortar, mass%:
Chamotte stain МШ-31 64-68
Solution of aluminoborophosphate concentrate with density (1.35-1.38 g / cm 3 ) 29-33
Powder-hardener of phosphate-binder composition 3
The solution consumption per 1 m 3 of masonry is 190-240 kg.
Aluminoborophosphate concentrate, supplied with a density of 1.59-1.60 g / cm 3 , is diluted with water with a temperature of at least + 5 ° C to a density of 1.35-1.38 g / cm 3 (1 to 0.7% per concentrate volume Volumes of water).
The preparation of the refractory phosphate solution is carried out in a mechanical mortar mixer. 50% of the prepared (diluted) aluminoborophosphate solution is poured into the solution mixer. Then 50% of the amount of powdered fillers is added and stirring is carried out until a homogeneous mass is obtained. In the same sequence, the remaining amount of binder (aluminoborophosphate solution) and powdered fillers is introduced.
The consistency of the solution is determined by a cone (StroTsNIL) weighing 100 g. The depth of immersion of the cone should be 4.5-5.5 divisions.
CLAIM
1. A method of preparing a refractory masonry mortar, comprising mixing with water a filler, a binder solution and a hardener, characterized in that as a filler, a chamotte shaker MSh-31 is used, as binder is an aluminoborophosphate concentrate, and as a curing agent is a double salt MgO · SiO 2 .
2. A method according to claim 1, characterized in that the filler is used in an amount of 64-68%, a binder solution in an amount of 29-33%, a curing agent in an amount of 3%.
3. A process according to claim 1, characterized in that the aluminoborophosphate concentrate is diluted with water to a density of 1.35-1.38 g / cm 3 .
print version
Publication date 17.01.2007gg
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