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A kind of zeolite modified cement combined with chromium-containing corundum castable and preparation method thereof

A cement-bonded, chromium-corundum-based technology, applied in the field of castables and their preparation, can solve problems such as environmental pollution, and achieve the effects of improving mechanical properties, promoting sintering and densification, and inhibiting formation and leaching.

Active Publication Date: 2021-08-17
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing calcium aluminate cement combined with chromium-containing refractory castables is likely to cause environmental pollution, the present invention proposes a zeolite modified cement combined with chromium-containing corundum castables and its preparation method

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0021] Specific embodiment one: In this embodiment, the zeolite modified cement combined with chromium-containing corundum castable consists of 10-20wt% platy corundum fine powder, 5-9wt% active α-Al 2 o 3 Micropowder, 3-12wt% chromium oxide fine powder, 2-6wt% calcium aluminate cement, 0.5-3wt% zeolite powder, 0.05-0.2wt% polycarboxylate dispersant and the rest platy corundum Granules are prepared.

[0022] This embodiment has the following beneficial effects:

[0023] 1. In this embodiment, platy corundum particles are used as aggregate, platy corundum fine powder and chromium oxide fine powder are used as matrix, calcium aluminate cement and zeolite powder are used as composite binder, and polycarboxylate is used as dispersant. A chromium-containing refractory castable is prepared. The preparation process is simple, and the production and use process is green and environment-friendly. Zeolite is an inexpensive, framework-like structure and porous hydrous aluminosilicate...

specific Embodiment approach 2

[0025] Specific embodiment two: the preparation method of zeolite modified cement combined with chromium-containing corundum castable in this embodiment is carried out according to the following steps:

[0026] 1. Weigh the raw materials;

[0027] Weigh 10-20wt% platy corundum fine powder, 5-9wt% active α-Al 2 o 3 Micropowder, 3-12wt% chromium oxide fine powder, 2-6wt% calcium aluminate cement, 0.5-3wt% zeolite powder, 0.05-0.2wt% polycarboxylate dispersant and the rest platy corundum pellets as raw material;

[0028] 2. Mix the calcium aluminate cement and zeolite powder weighed in step 1 evenly to obtain a composite binder;

[0029] 3. The polycarboxylate dispersant, platy corundum particles, platy corundum fine powder, active α-Al 2 o 3 Micropowder and chromium oxide fine powder, and the composite binding agent obtained in step 2 are mixed uniformly to obtain a premix;

[0030] 4. Add 3-6wt% water to the premix obtained in step 3 and mix evenly to obtain a wet mixture...

specific Embodiment approach 3

[0036] Specific embodiment three: the difference between this embodiment and specific embodiment two is: the Al in the plate-shaped corundum particles described in step one 2 o 3 content>99wt%; the distribution of particle size d in tabular alumina particles is: the content of tabular alumina particles with d<1mm is 20-30wt%, and the content of tabular corundum particles with 1≤d<3mm is 35-45wt %, 3≤d<5mm plate-shaped corundum particles are the balance. Other steps and parameters are the same as in the second embodiment.

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Abstract

A zeolite-modified cement combined with a chromium-containing corundum castable and a preparation method thereof relate to a castable and a preparation method thereof. The purpose is to solve the existing Cr-containing calcium aluminate cement as a binder. 2 O 3 Refractory castables are easy to cause environmental pollution problems. The castable is composed of tabular corundum fine powder, active α-Al 2 O 3 It is prepared from micro powder, fine chromium oxide powder, calcium aluminate cement, zeolite powder, polycarboxylate dispersant and tabular corundum particles. Preparation method: weighing raw materials and mixing to obtain a premix, adding water and stirring to obtain a wet mix, pouring and vibrating the wet mix, and finally performing curing, drying and heat treatment in sequence. The zeolite powder in the invention can control the migration and diffusion of metal ions, inhibit the formation and leaching of Cr(VI) compounds, and realize green and environmental protection production; meanwhile, the sintering and densification of the castable is promoted, and the mechanical properties of the chromium-containing castable are significantly improved. and resistance to slag erosion. The invention is suitable for preparing chromium-containing castables.

Description

technical field [0001] The invention relates to a pouring material and a preparation method thereof. Background technique [0002] Chromium-free (Cr 2 o 3 ) refractory materials in the case of high service temperature and complex and changeable slag composition, the service life will be significantly reduced, so the use cost will increase and the adaptability will be poor. Due to Cr 2 o 3 It has the advantages of high melting point, good chemical stability and low solubility in liquid slag, and a small amount of Cr 2 o 3 Dissolving in the slag can significantly increase the viscosity of the slag, so the introduction of Cr into the refractory material 2 o 3 It can significantly improve the anti-slag erosion performance of the material. In addition, Cr 2 o 3 at high temperature with Al 2 o 3 Reaction to form (Al,Cr) with lower coefficient of expansion 2 o 3 Solid solution, which improves the high-temperature mechanical properties and thermal shock stability of re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3217C04B2235/3222C04B2235/3241C04B2235/3463
Inventor 李亚伟徐腾腾廖宁桑绍柏徐义彪
Owner WUHAN UNIV OF SCI & TECH
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