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Calcium aluminate cement containing carbon and preparation method thereof

A carbon-containing calcium aluminate and calcium aluminate cement technology, which is applied in the field of refractory materials, can solve the problems of unfavorable industrial production, reduce the amount of cement added, and high energy consumption, and achieve shortened synthesis time, improved slag resistance, and low energy consumption. Effect

Active Publication Date: 2019-06-07
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since this method uses direct solid-state reaction, it still contains a relatively high content of CA 2 , which is not conducive to reducing the amount of cement added and the amount of CaO introduced; in addition, this method adopts the buried carbon sintering method, which is only suitable for small-scale production and has high energy consumption, which is not conducive to industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A carbon-containing calcium aluminate cement and a preparation method thereof. The preparation method described in this embodiment is as follows: first use 57-62wt% aluminum hydroxide, 36-40wt% calcium carbonate and 1-4wt% graphite as raw materials, ball mill the raw materials for 3-4.5 hours, dry, Obtain premixed powder; then mold the premixed powder under the condition of 30-60MPa, then place it in a microwave sintering furnace, heat it to 1150-1200°C under the condition of argon or nitrogen atmosphere, and keep it warm for 20-30min , with the furnace cooling, the system contains calcium aluminate cement.

[0032] The graphite is flake graphite.

[0033] The carbon-containing calcium aluminate cement prepared in this example is detected by XRD: the CA content is 94-98wt%, and the CA content is 94-98wt%. 2 Content is 1~2wt%, C 12 A 7 The content is less than 0.1wt%.

Embodiment 2

[0035] A carbon-containing calcium aluminate cement and a preparation method thereof. The preparation method described in this embodiment is as follows: first use 56-61wt% aluminum hydroxide, 35-39wt% calcium carbonate and 3-6wt% graphite as raw materials, ball mill the raw materials for 3.5-5 hours, dry, Obtain premixed powder; then mold the premixed powder under the condition of 30-60MPa, then place it in a microwave sintering furnace, heat it to 1100-1175°C under the condition of argon or nitrogen atmosphere, and keep it warm for 15-25min , with the furnace cooling, the system contains calcium aluminate cement.

[0036] The graphite is expanded graphite.

[0037] The carbon-containing calcium aluminate cement prepared in this example is detected by XRD: the CA content is 91-95wt%, and the CA content is 91-95wt%.2 Content is 2~3wt%, C 12 A 7 The content is less than 0.1wt%.

Embodiment 3

[0039] A carbon-containing calcium aluminate cement and a preparation method thereof. The preparation method described in this embodiment is: first use 55-60wt% aluminum hydroxide, 34-38wt% calcium carbonate and 5-8wt% graphite as raw materials, ball mill the raw materials for 4-5.5 hours, dry, Obtain premixed powder; then mold the premixed powder under the condition of 30-60MPa, then place it in a microwave sintering furnace, heat it to 1050-1125°C under the condition of argon or nitrogen atmosphere, and keep it warm for 10-20min , with the furnace cooling, the system contains calcium aluminate cement.

[0040] The graphite is microcrystalline graphite.

[0041] The carbon-containing calcium aluminate cement prepared in this example is detected by XRD: the CA content is 88-92wt%, and the CA content is 88-92wt%. 2 Content is 3~4wt%, C 12 A 7 The content is less than 0.1wt%.

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Abstract

The invention relates to calcium aluminate cement containing carbon and a preparation method thereof. The method comprises the following steps: by taking 54-62 wt% of aluminum hydroxide, 33-40 wt% ofcalcium carbonate and 1-10 wt% of graphite as raw materials, carrying out ball milling on the raw materials for 3-6 hours, and drying the raw materials to obtain premixed powder; carrying out compression molding on the premixed powder under 30-60 MPa, then putting the molded product into a microwave sintering furnace, heating the molded product to 1000-1200 DEG C under the condition of argon or nitrogen atmosphere, carrying out heat preservation for 5-30 minutes, and cooling the molded product along with the furnace to prepare the calcium aluminate cement containing carbon. The preparation method has the characteristics of low energy consumption, low production cost and suitability for industrial production. The CA content of the calcium aluminate cement containing carbon is high, and theslag resistance of the castable can be improved.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a carbon-containing calcium aluminate cement and a preparation method thereof. Background technique [0002] In recent years, with the development of unshaped refractory technology, castables have become more and more widely used and widely used in the industry. In the use of refractory castables, they are often faced with high service temperature and slag erosion, so high temperature performance and slag erosion resistance are very important. The matrix part of refractory castables is not only loose but also complex in composition, which is its weakest link. The composition of the matrix determines the performance of refractory castables to a large extent, and the choice of binder is particularly important. Calcium aluminate cement, as a traditional refractory castable binder, has high bonding strength and adaptability to various systems, and has been w...

Claims

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Application Information

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IPC IPC(8): C04B7/32C04B35/66
Inventor 李亚伟刘耕夫单江博桑绍柏
Owner WUHAN UNIV OF SCI & TECH
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