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A kind of preparation method of refractory castable binder for strong alkali environment

A technology of refractory castables and binders, applied in the field of refractory castables, can solve the problems of low use temperature, long hardening time, low demoulding and drying strength, etc.

Inactive Publication Date: 2018-10-09
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, if soft clay is used as a binder castable, the demoulding and drying strength is too low, and the strength can only be improved by forming a ceramic bond through high-temperature sintering
Castables made of water glass as a binder are prone to "pan-alkaline" when dry, the binder is unevenly distributed, the hardening time is long, and the allowable use temperature is low

Method used

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  • A kind of preparation method of refractory castable binder for strong alkali environment
  • A kind of preparation method of refractory castable binder for strong alkali environment
  • A kind of preparation method of refractory castable binder for strong alkali environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take high-quality bauxite from open mining in the eastern section of Jiajiawa, Mianchi, grind it through a 325 mesh sieve, and dry it with a sieve allowance of ≤10%. The chemical composition analysis results (wt%) are as follows:

[0025] Table 1

[0026]

[0027]

[0028] al 2 o 3 =73.28%, SiO 2 =6.85%, Al 2 o 3 / SiO 2 =10.7, Fe 2 o 3 Content less than 1.5%, CaO content less than 1.0%, SO 3 The content is less than 0.2%; it meets the chemical composition conditions of raw materials.

[0029] Ingredients composition calculation

[0030] NaOH→Na 2 O: The conversion factor is 0.775;

[0031] Bauxite (raw meal): conversion factor is 0.8657;

[0032] Weigh and dry bauxite fine powder raw meal 100kg / 0.8657=115.5kg (100kg after burning); 2 o 3 84.60kg, according to Na 2 O / Al 2 o 3 = 0.7 ingredients;

[0033] Join Na 2 The amount of O is 59.22kg, and the NaOH conversion coefficient is 0.775, that is, adding NaOH is: 59.22kg / 0.775=76.41kg

[0034] The ...

Embodiment 2

[0038] The difference between this embodiment and embodiment 1 is: by Na 2 O / Al 2 o 3 =0.6 ingredients; heat and stir for 3 hours at 150°C and working pressure of 0.3Mpa to prepare the binder.

[0039] The binder prepared in this example is mixed with burnt gemstone aggregate and fine powder with an alumina content of 42%, and can be cured within 24 hours in a natural environment. After drying at 110°C, the flexural bonding strength is 14.8Mpa, which is 61% higher than that of water glass as a binder, and the refractoriness of the castable reaches 1750°C, which is 380°C higher than that of water glass castable. Its construction and high temperature performance are obviously better than water glass castables.

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Abstract

The invention discloses a preparation method of a refractory castable binder for a strong alkali environment. The method uses bauxite as a raw material, and controls the mass fraction of alumina and silicon oxide and the ratio of Al2O3 / SiO2 in the bauxite. Crush the bauxite, grind it so that more than 90% of the particle size passes through a 325-mesh sieve, then mix it with NaOH lye, control the ratio of Na2O / Al2O3, and wet mill for 4 hours to obtain a mixed slurry. Put the mixed slurry into a high-pressure high-temperature reaction kettle, add water to control the density of the slurry to 1.4-1.5g / cm3, and heat at 150°C-180°C for 2-3 hours to obtain a viscous solution. The viscous solution is the binder for refractory castables used in strong alkaline environments. Using the same raw material, the alkali-resistant castable made of this binder has a flexural bond strength of more than 60% higher than that of water glass as a binder after drying at 110°C, and the refractoriness of the castable is 350°C higher than that of water glass castable. Its construction and high temperature performance are obviously better than water glass castables.

Description

technical field [0001] The invention relates to a refractory castable for masonry thermal kilns in the refractory industry, in particular to a preparation method for a binder used in the production of a refractory castable used in a strong alkaline environment. Background technique [0002] At present, the castable aggregates used in the strong alkaline environment are mostly clay materials with low alumina content in the silicon-aluminum system, and the binder is sintered with soft clay at high temperature, or water glass containing sodium oxide is used as the binder. , the purpose of which is to form a layer of high-viscosity glass phase on the surface of the castable in a high-temperature environment to prevent the penetration and intrusion of alkaline media. [0003] However, if soft clay is used as a castable as a binder, the demoulding and drying strength is too low, and the strength can only be improved by high-temperature sintering to form a ceramic bond. Castables ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3217
Inventor 薛群虎萧礼标赵志龙田利萍
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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