Hydration-resistant MgO-CaO series fireproofing material and preparation method thereof

A refractory material and hydration-resistant technology, which is applied in the field of refractory material production, can solve the problems of easy shedding of the coating layer, failure of hydration resistance, and difficult control, etc., to achieve improved mechanical properties and corrosion resistance, low production cost, The effect of easy operation

Inactive Publication Date: 2009-12-16
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Phosphoric acid and phosphate coating make the CaO on the surface of MgO-CaO materials generate calcium phosphate compound, which improves its hydration resistance, but phosphorus will pollute the molten steel, and the coating layer is easy to fall off during the construction process. fail
CO 2 Carbonation treatment makes CaO on the surface of MgO-CaO series materials generate CaCO 3 , to improve the hydration resistance, but using CO alone 2 Processing, slower response, less effective
Chinese patent 01128336.X utilizes CO 2 Mixed gas with water vapor reacts with CaO on the surface of MgO-CaO materials to form CaCO which is resistant to hydration 3 Membrane, mixed with water vapor can accelerate the reaction, but because water vapor is more likely to hydrate CaO, it is easy to cause cracking and is not easy to control. In addition, there are disadvantages such as uneven coating and e

Method used

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  • Hydration-resistant MgO-CaO series fireproofing material and preparation method thereof
  • Hydration-resistant MgO-CaO series fireproofing material and preparation method thereof
  • Hydration-resistant MgO-CaO series fireproofing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Mix 180-mesh magnesia with carbon black, 180-mesh graphite, and 180-mesh coke, respectively, according to the molar ratio of MgO and C of 1:1, and put two parts into the bottom of different reaction vessels, a total of six groups. MgO-CaO materials with CaO content of 20%, 56% and 90% and particle size of 2-4 mm are respectively put into reaction vessels filled with magnesia and carbon mixture. Put the reaction vessel into a controllable atmosphere furnace, vacuumize and fill with Ar for protection, and start to pass O 2 , O 2 The flow rate is 250 l / h, and the temperature is kept for 4 hours to obtain a hydration-resistant MgO-CaO-based refractory material.

[0040] Anti-hydration test: Take 50g of the treated MgO-CaO-based material with a particle size of 2-4mm and the untreated MgO-CaO-based material into a 100ml beaker, cover it with a watch glass, and put it in In a high-pressure steamer, under the condition of a pressure of 0.15MPa, keep warm for 2 hours, take ou...

Embodiment 2

[0047] 180 mesh magnesia and carbon black are uniformly mixed according to the molar ratio of MgO and C of 1:1 as the reaction raw material, and the MgO-CaO series materials are treated with three kinds of CaO content of 20%, 56% and 90%, respectively, heated to 1500 ° C, 1550 ° C °C, 1600 °C, 1650 °C and then heat preservation for 4 hours to obtain a hydration-resistant MgO-CaO refractory material. The hydration resistance data are shown in Table 2.

[0048] Table 2

[0049]

Embodiment 3

[0051] 180 mesh magnesia and carbon black are uniformly mixed according to the molar ratio of MgO and C of 1:1 as the reaction raw material, and the MgO-CaO series materials are treated with three kinds of CaO content of 20%, 56% and 90%. After 2 hours, 4 hours, 6 hours, and 8 hours, hydration-resistant MgO-CaO-based refractories were obtained, and the hydration-resistant data are shown in Table 3.

[0052] table 3

[0053]

[0054]

[0055] table 3

[0056] In the above examples, the surface morphology pictures of the prepared MgO-CaO-based refractories with a CaO content of 20% and the MgO-CaO-based refractories with a CaO content of 56% can be found in figure 1 and figure 2 .

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Abstract

The invention discloses a hydration-resistant MgO-CaO series fireproofing material and a preparation method thereof. The surface of the prepared MgO-CaO series fireproofing material is covered with a compact MgO hydration-resistant film layer. The preparation method of the invention is as follows: magnesium sand and carbon serve as reaction raw materials; MgO-CaO series material is arranged above the mixture of the magnesium sand and the carbon, and a reaction vessel is arranged in a controlled atmosphere furnace; the controlled atmosphere furnace is vacuumized, and Ar is led in the furnace for protection; the furnace body is heated, O2 is led in, and the magnesium sand and the carbon have carbothermal reduction reaction to generate Mg steam; the Mg steam diffuses to the vicinity of MgO-CaO series material so as to react with the lead-in O2; an MgO compact film is generated on the surface of the MgO-CaO series material; after the MgO compact film generated by vapor phase deposition totally covers the CaO on the surface of the MgO-CaO series material, the hydration-resistant MgO-CaO series fireproofing material can be obtained. Because the MgO compact film prevents CaO from contacting with water, the hydration-resistant performance of the MgO-CaO series fireproofing material is obviously improved. The preparation method is simple and convenient to operate, the raw materials fully react, and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of refractory production, in particular to a hydration-resistant MgO-CaO series refractory and a preparation method thereof. Background technique [0002] MgO-CaO series refractories have the following excellent physical and chemical properties: ① high refractoriness; ② stable thermodynamic properties at high temperature; ③ good thermal shock stability; ④ good slag resistance; The reserves are abundant and the products are pollution-free. It can be used in the field of iron and steel smelting, such as high temperature equipment such as ladles, tundishes and out-of-furnace refining. Especially with the development of clean steel, the call for MgO-CaO refractories is getting higher and higher. At the same time, it is an ideal material to replace magnesia-chrome materials when it is applied to the firing zone of cement rotary kiln. However, MgO-CaO-based refractory materials have not been widely used. The ma...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/622
Inventor 尹洪峰马艳龙张军战任耘
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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