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Test sample of gunning material containing calcium oxide and preparation method thereof

A technology containing calcium oxide and gunning material, which is applied in the preparation, sampling, and measuring devices of test samples, can solve the problems of cracking and pulverization of samples, achieve high mold release strength, and avoid potential safety hazards

Active Publication Date: 2018-05-08
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a large amount of liquid water in the sample during the high-temperature curing process, and the hydration reaction between the liquid water and the CaO in the sample is very easy to occur, and even causes the sample to crack and pulverize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A test sample of gunning material containing calcium oxide and its preparation method, characterized in that the preparation method is: stirring the gunning material containing calcium oxide for 1 to 3 minutes, and adding 8 to 18 wt of gunning material containing calcium oxide % water, mixed for 3-5 minutes, placed in the mold, and vibrated to shape; maintained at room temperature for 5-15 hours, demolded; then placed in a vacuum freeze-drying box, freeze-dried to constant weight, and the spray Feed test samples.

[0022] The main chemical components of the gunning material containing calcium oxide are: MgO is 85-93%, CaO is 1-8%, SiO 2 5.5-6.5%, Na 2 O<0.5%; the main phases of the calcium oxide-containing gunning material are periclase and free calcium oxide.

[0023] The calcium oxide-containing gunning material test sample prepared by the present invention is intact after drying, without cracking and pulverization; after testing: the flexural strength is 1.5-2.2MPa...

Embodiment 2

[0025] A test sample of gunning material containing calcium oxide and its preparation method, characterized in that the preparation method is: stirring the gunning material containing calcium oxide for 1 to 3 minutes, and adding 8 to 18 wt of gunning material containing calcium oxide % water, mixed for 3-5 minutes, placed in the mold, and vibrated to shape; maintained at room temperature for 5-15 hours, demolded; then placed in a vacuum freeze-drying box, freeze-dried to constant weight, and the spray Feed test samples.

[0026] The main chemical composition of the gunning material containing calcium oxide is: MgO is 79-86%, CaO is 7-14%, SiO 2 5.5-6.5%, Na 2 O<0.5%; the main phases of the calcium oxide-containing gunning material are periclase and free calcium oxide.

[0027] The calcium oxide-containing gunning material test sample prepared by the present invention is intact after drying, without cracking and pulverization; after testing: the flexural strength is 2.4-2.9MP...

Embodiment 3

[0029] A test sample of gunning material containing calcium oxide and its preparation method, characterized in that the preparation method is: stirring the gunning material containing calcium oxide for 1 to 3 minutes, and adding 8 to 18 wt of gunning material containing calcium oxide % water, mixed for 3-5 minutes, placed in the mold, and vibrated to shape; maintained at room temperature for 5-15 hours, demolded; then placed in a vacuum freeze-drying box, freeze-dried to constant weight, and the spray Feed test samples.

[0030] The main chemical composition of the gunning material containing calcium oxide is: MgO is 71-80%, CaO is 13-22%, SiO 2 5.5-6.5%, Na 2 O<0.5%; the main phases of the calcium oxide-containing gunning material are periclase and free calcium oxide.

[0031] The test sample of the gunning material containing calcium oxide prepared by the present invention is intact after drying, without cracking and pulverization; after testing: the flexural strength is 2...

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Abstract

The invention relates to a test sample of a gunning material containing calcium oxide and a preparation method thereof. According to the technical scheme, the gunning material containing calcium oxideis stirred for 1-3 min, water accounting for 8-18wt% of the weight of the gunning material containing calcium oxide is added, mixing is conducted for 3-5 min, the mixture is placed in a mould, and vibration forming is conducted; maintenance is conducted under normal temperature conditions for 5-15 h, and demoulding is conducted; then the mixture is placed in a vacuum freeze-drying box, freeze drying is conducted till the mixture has a constant weight, and the test sample of the gunning material containing calcium oxide is obtained. The gunning material containing calcium oxide is mainly prepared from 60-93% of MgO, 1-33% of CaO, 5.5-6.5% of SiO2 and less than 0.5% of Na2O; the main material phases of the gunning material containing calcium oxide are periclase and free calcium oxide. The prepared test sample of the gunning material containing calcium oxide has no chalking phenomenon in the forming and freeze-drying stages, the demolding strength is high, and various physical propertiesof the gunning material containing calcium oxide can be detected.

Description

technical field [0001] The invention belongs to the technical field of gunning material test samples. Specifically relates to a calcium oxide-containing gunning material test sample and a preparation method thereof. Background technique [0002] The gunning material can be used to construct and repair the furnace lining and be coated as a protective layer in the cold state, and is more suitable for repairing the furnace lining in the hot state. At present, gunning materials have been widely used as lining repair materials for industrial kilns such as metallurgy, cement, chemical industry and petroleum. With the development of advanced and clean steelmaking technology, the demand for clean steel with low impurity content is increasing. Gunning materials containing calcium oxide are also widely used in steelmaking due to their advantages of purifying molten steel and excellent high-temperature performance. Repair of converter and refining furnace lining materials. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
CPCG01N1/286
Inventor 梁永和沈森材蔡曼菲聂建华尹玉成蔡玮曾建
Owner WUHAN UNIV OF SCI & TECH
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