Dense calcium hexaluminate grog refractory and preparation method thereof

A technology of calcium hexaaluminate and refractory clinker, applied in the field of refractory materials, can solve the problems of affecting the sintering and densification of calcium hexaaluminate refractory materials, low sintering activity of calcium hexaaluminate phase, and difficulty in obtaining dense clinker, etc. The effect of promoting sintering and densification behavior, increasing activity, reducing production energy consumption and production costs

Active Publication Date: 2016-05-18
LIAONING INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of preparing dense calcium hexaaluminate refractory clinker by solid-phase synthesis, it is difficult to obtain dense refractory clinker through one-time calcination because the volume expansion effect accompanied by the reaction between components inhibits the sintering and densification process; , due to the low sintering activity of the calcium hexaaluminate phase, it is difficult to obtain dense clinker even after two calcinations, so it is generally required that the sintering temperature should not be lower than 1700°C; Dendrites bridge and interconnect to form a network porous structure, which further affects the sintering densification of calcium hexaaluminate refractories

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Al in the raw material bauxite that adopts in the present embodiment 2 o 3 The weight percentage of CaO in limestone is 74.20%, and the weight percentage of CaO in limestone is 54.50%.

[0021] The prepared dense calcium hexaaluminate refractory clinker contains Al by weight percentage 2 o 3 88.87%, CaO8.13%, MnO3.00%; the relative density is 90.90%, and the apparent porosity is 4.40%; the preparation method is carried out according to the following steps:

[0022] (1) Separately crush and grind bauxite, magnesite and limestone to a particle size of ≤88 mesh, and mix them in a sand mixer to make a mixed material, in which bauxite accounts for 88.90% of the total weight of the mixed material, Limestone accounts for 11.10% of the total weight of the mixture;

[0023] (2) The mixed material is pressed into green balls under a pressure of 150MPa by a ball pressing machine, and the green balls are kept at 1250°C for 2 hours, and then calcined for the first time to make c...

Embodiment 2

[0028] Al in the raw material bauxite that adopts in the present embodiment 2 o 3 The weight percentage of CaO is 75.60%, and the weight percentage of CaO in limestone is 54.00%.

[0029] The prepared dense calcium hexaaluminate refractory clinker contains Al by weight percentage 2 o 3 88.60%, CaO8.10%, MnO3.30%; the relative density is 91.70%, and the apparent porosity is 4.20%; the preparation method is carried out according to the following steps:

[0030] (1) Separately crush and grind bauxite, magnesite and limestone to a particle size of ≤88 mesh, and mix them in a sand mixer to make a mixed material, in which bauxite accounts for 88.62% of the total weight of the mixed material, Limestone accounts for 11.38% of the total weight of the mixture;

[0031] (2) The mixed material is pressed into green balls under a pressure of 140MPa by a ball press machine, and the green balls are kept at 1250°C for 2 hours, and then calcined for the first time to make primary clinker; ...

Embodiment 3

[0035] Al in the raw material bauxite that adopts in the present embodiment 2 o 3 The weight percentage of CaO in limestone is 77.80%, and the weight percentage of CaO in limestone is 53.80%.

[0036] The prepared dense calcium hexaaluminate refractory clinker contains Al by weight percentage 2 o 3 88.41%, CaO8.09%, MnO3.50%; the relative density is 92.40%, and the apparent porosity is 3.90%; the preparation method is carried out according to the following steps:

[0037] (1) Separately crush and grind bauxite, magnesite and limestone to a particle size of ≤88 mesh, and mix them in a sand mixer to make a mixed material, in which bauxite accounts for 88.29% of the total weight of the mixed material, Limestone accounts for 11.71% of the total weight of the mixture;

[0038] (2) The mixed material is pressed into green balls under a pressure of 120MPa by a ball pressing machine, and the green balls are kept at 1200°C for 2 hours, and then calcined for the first time to make c...

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Abstract

The invention discloses a dense calcium hexaluminate grog refractory and a preparation method thereof. The refractory is prepared from, by weight, 87.04-88.87% of Al2O3, 7.96-8.13% of CaO and 3.00-5.00% of MnO, wherein the relative density is 90.90-94.80%, and the apparent porosity is 2.80-4.40%. The preparation method includes the steps of firstly, grinding and mixing bauxite and limestone; secondly, pressing the mixture into raw balls, and primarily calcining the raw balls to prepare clinker; thirdly, adding manganous oxide fine powder after clinker is ground fine, and pressing the mixture into balls; fourthly, conducting secondary calcining. The manganous oxide fine powder is adopted as a sintering promoter, solid manganous oxide is dissolved in a calcium hexaluminate phase in the calcining process to form a solid solution, and therefore the sintering activity of the calcium hexaluminate phase is improved, the growth of the calcium hexaluminate phase is promoted, and therefore the dense calcium hexaluminate grog refractory can be obtained at a low secondary calcining temperature within a short heat preservation time, production energy consumption is effectively lowered, production efficiency is improved, and energy conservation and emission reduction are promoted.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a dense calcium hexaaluminate refractory clinker and a preparation method thereof. Background technique [0002] Calcium hexaaluminate (CA 6 ) high melting point (1870°C), good refractory performance, low solubility in iron-containing slag, high stability in reducing atmosphere (CO), good chemical stability in alkaline environment, good for molten metal and molten Slag (steel and non-ferrous metals) has low wettability, so it is a very good high temperature resistance, corrosion resistance, metal liquid and slag penetration resistance, high temperature heat insulation performance material, and can be directly used in metallurgical furnace lining and metallurgical cladding A new type of refractory material in which the lining hot surface is in contact with molten metal and molten salt. At the same time, calcium hexaaluminate has good chemical compatibili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/101C04B35/66C04B35/626
CPCC04B35/101C04B35/62605C04B2235/3208C04B2235/3262C04B2235/604C04B2235/77
Inventor 不公告发明人
Owner LIAONING INST OF SCI & TECH
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