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Refractory material high calcium magnesium carbon brick for smelting

A high-calcium magnesia carbon brick and refractory technology, which is applied in the field of smelting refractory materials, can solve problems such as damage to magnesia carbon bricks, and achieve the effects of slowing down loss, inhibiting reduction and decomposition, and making the process reasonable.

Inactive Publication Date: 2008-08-13
陈正师
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  • Abstract
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  • Application Information

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Problems solved by technology

However, with the increase of smelting intensity, MgO is reduced and decomposed during smelting above 1700°C, and magnesia carbon bricks are gradually damaged

Method used

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Embodiment Construction

[0018] The technical scheme of the present invention is described in detail below by specific embodiments:

[0019] A refractory high calcium magnesia carbon brick for smelting, the preparation process of which comprises the following steps:

[0020] 1) Raw materials; magnesia, high calcium magnesia, carbon materials, the physical and chemical indicators are as follows:

[0021] Magnesia: Among them MgO 96-98%, CaO≤1%, ∑SiO 2 , Fe 2 O 3 , AlO 3 ≤3%, apparent porosity ≤1%, bulk density ≥3.4g / cm 3

[0022] High calcium magnesia: MgO 60-70%, CaO≤30-40%, ∑SiO 2 , Fe 2 O 3 , AlO 3 ≤3%, apparent porosity ≤1%, bulk density ≥3.5g / cm 3

[0023] Carbon material: use scaly high-carbon or medium-carbon graphite produced in Shandong or Heilongjiang, and the grade should meet the following requirements according to the carbon content: the carbon content of the special grade is ≥98; the carbon content of the first grade is 98-96; the carbon content of the second grade 90-96; Leve...

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PUM

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Abstract

The present invention relates to a smelting used fire-resistant material high-calcium magnesium carbon brick which is made from magnesia, high-calcium magnesia, carbon element material and bonding agent according to a certain proportion after the processes of milling, molding, heat treating and finished product sorting. Comparing with the prior art the invention has the following advantages: reasonable technique, restraining the decomposition of MgO above 1700 DEG C, retarding the attrition of the brick, creating condition for the high-strength and high-stirring smelting process with temperature above 1800 DEG C, using for the nation defense building and the requirement of the industrial production, the high-calcium magnesium carbon brick is one of the most important special refractories in our country.

Description

technical field [0001] The invention relates to a refractory material for smelting. Background technique [0002] Since the advent of magnesia-carbon bricks, almost all open hearth furnaces have been eliminated, and converters or high-power electric furnaces with top-bottom composite blowing have been used. At the same time, in order to meet the needs of bottom-blown air supply bricks, high-strength and oxidation-resistant magnesia-carbon bricks with various metal powders have been developed in recent years. However, with the improvement of smelting strength, in the smelting above 1700 ℃, MgO is reduced and decomposed, and the magnesia-carbon brick is gradually damaged. [0003] The addition of CaO in high calcium magnesia carbon bricks weakens and inhibits the reduction and decomposition of MgO, slows down the loss of bricks above 1700 °C, and creates conditions for the smelting process of high strength and high stirring above 1800 °C, and can be smelted into a variety of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 陈正师
Owner 陈正师
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