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Process method for preparing compact calcium hexaluminate refractory clinker by one-step method

A technology of calcium hexaaluminate and refractory clinker, which is applied in the field of refractory materials and can solve the problems of difficulty in obtaining dense clinker, high energy consumption, and high production costs

Pending Publication Date: 2021-04-27
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, the sintering and densification process is inhibited due to the volume expansion effect accompanied by the reaction between the components of each raw material, and at the same time, due to the sintering of the calcium hexaaluminate phase The activity is low, and it is difficult to obtain dense clinker even through high-temperature calcination. In addition, because the calcium hexaaluminate crystal phase is easy to bridge and interconnect to form a network porous structure during the reaction process, it further affects the sintering density of the calcium hexaaluminate refractory. change
Invention patents CN105585314B and CN110171980A disclose the preparation method of dense calcium hexaaluminate refractory clinker. The process is a two-step production process, that is, one-step pre-burning to eliminate volume expansion effect, and two-step firing to densify the production method. The process is complicated, the energy consumption is large, and the production cost is high

Method used

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  • Process method for preparing compact calcium hexaluminate refractory clinker by one-step method
  • Process method for preparing compact calcium hexaluminate refractory clinker by one-step method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Al in the raw material bauxite that adopts in the present embodiment 2 o 3 The weight percentage of CaO in limestone is 76.20%, and the weight percentage of CaO in limestone is 54.60%.

[0022] The prepared dense calcium hexaaluminate refractory clinker contains Al by weight percentage 2 o 3 89.79%, CaO 8.21%, La in a weight ratio of 1:1 2 o 3 with TiO 2 Mixed fine powder 2.00%; relative density is 91.30%, apparent porosity is 4.50%; preparation method is carried out according to the following steps:

[0023] (1) Separately crush bauxite and limestone and grind them to a particle size of ≤88 mesh, and add La at a weight ratio of 1:1 2 o 3 with TiO 2 After mixing the micropowder, mix it in a sand mixer to make a mixed material, wherein bauxite accounts for 87.37% of the total weight of the mixed material, limestone accounts for 11.15% of the total weight of the mixed material, and the weight ratio is 1:1 La 2 o 3 with TiO 2 The mixed fine powder accounts for ...

Embodiment 2

[0027] Al in the raw material bauxite that adopts in the present embodiment 2 o 3 The weight percentage of CaO in limestone is 77.50%, and the weight percentage of CaO in limestone is 53.70%.

[0028] The prepared dense calcium hexaaluminate refractory clinker contains Al by weight percentage 2 o 3 89.60%, CaO 8.20%, La in a weight ratio of 1:1 2 o 3 with TiO 2 Mixed micropowder 2.20%; relative density is 91.90%, apparent porosity is 4.30%; preparation method is carried out according to the following steps:

[0029] (1) Separately crush bauxite and limestone and grind them to a particle size of ≤88 mesh, and add La at a weight ratio of 1:1 2 o 3 with TiO 2 After mixing the micropowder, mix it in a sand mixer to make a mixed material, wherein bauxite accounts for 86.88% of the total weight of the mixed material, limestone accounts for 11.47% of the total weight of the mixed material, and the weight ratio is 1:1 La 2 o 3 with TiO 2 The mixed fine powder accounts for ...

Embodiment 3

[0032] Al in the raw material bauxite that adopts in the present embodiment 2 o 3 The weight percentage of CaO in limestone is 78.80%, and the weight percentage of CaO in limestone is 53.10%.

[0033] The prepared dense calcium hexaaluminate refractory clinker contains Al by weight percentage 2 o 3 89.33%, CaO 8.17%, La in a weight ratio of 1:1 2 o 3 with TiO 2 Mixed powder 2.50%; relative density is 92.50%, apparent porosity is 3.90%; preparation method is carried out according to the following steps:

[0034] (1) Separately crush bauxite and limestone and grind them to a particle size of ≤88 mesh, and add La at a weight ratio of 1:1 2 o 3 with TiO 2 After mixing the micropowder, mix it in a sand mixer to make a mixed material, wherein bauxite accounts for 86.37% of the total weight of the mixed material, limestone accounts for 11.72% of the total weight of the mixed material, and the weight ratio is 1:1 La 2 o 3 with TiO 2 The mixed fine powder accounts for 1.9% ...

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Abstract

The invention relates to a process method for preparing a compact calcium hexaluminate refractory clinker by a one-step method. The compact calcium hexaluminate refractory clinker comprises the following components in percentage by weight: 387.96-89.79% of Al2O3, 8.04-8.21% of CaO and 2.00-4.00% of mixed powder, which is composed of La2O3 and TiO2 according to a weight ratio of 1:1. The relative density is 91.30-94.60%, and the apparent porosity is 2.80-4.50%. The preparation method comprises the following steps: (1) respectively grinding bauxite, limestone and mixed powder, which is composed of La2O3 and TiO2 according to a weight ratio of 1:1, and then mixing; and (2) pressing the mixture into green pellets, and calcining to obtain clinker. According to the invention, mixed powder, which is composed of La2O3 and TiO2 according to a weight ratio of 1:1, is used as a sintering promoter, and is dissolved in a calcium hexaluminate phase to form a solid solution in the calcining process, so that the sintering activity of the calcium hexaluminate phase is improved, the growth of the calcium hexaluminate phase is promoted, therefore, the compact calcium hexaluminate refractory clinker can be obtained under the conditions of lower calcination temperature and shorter heat preservation time, the production energy consumption is effectively reduced, the 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 one-step process for preparing dense calcium hexaaluminate refractory clinker. Background technique [0002] Calcium hexaaluminate (CA 6 ) high melting point (1870°C), good fire resistance, 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 ladle 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 compatibility and simil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/44C04B35/66C04B35/64
CPCC04B35/44C04B35/66C04B35/64C04B2235/3208
Inventor 尹雪亮韩廷全丁洪海王全洲尹雪冬司伟张博
Owner LIAONING INST OF SCI & TECH