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Additive for producing high-purity fused magnesite

A technology of fused magnesia and additives, which is applied in the field of refractory material production, can solve the problems of no strict control of alloy impurity content, complicated process, and decreased Ca/Si ratio

Active Publication Date: 2014-07-02
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these additive combinations do not strictly control the introduction of foreign elements, and some additives only focus on lowering the melting point of the system, and do not specifically remove impurities, but instead cause the content of elements such as sodium, calcium, and silicon to increase and enrich. It makes the Ca / Si ratio decrease, which does not meet the requirement of greater than 2 for general industrial applications
Moreover, the rare earth ytterbium tantalum cerium samarium magnesium alloy needs to be prepared with rare earth oxides, the process is complex, the alloy impurity content is not strictly controlled and the cost is high

Method used

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  • Additive for producing high-purity fused magnesite
  • Additive for producing high-purity fused magnesite
  • Additive for producing high-purity fused magnesite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 21.2kg of light-burned magnesia with a purity of 85%, and a particle size of 200 mesh. First, mix evenly with 200g of high-purity graphite powder and raw materials. In addition, 50 g of titanium oxide was sprinkled in layers. The stockpile was then compacted with weights for 24 hours. A three-phase electric arc furnace with a power of 40KVA is used for melting, and 10g of lanthanum oxide and 10g of cerium oxide are added at the time of the first feeding. The melting time is 7.5 hours, during which the voltage is 40-90V and the current is 100-400A. Finally, high-purity white and transparent large-crystal fused magnesia is obtained, and the magnesium oxide content is above 99.10%. Such as figure 1 Shown:

[0032]

Embodiment 2

[0034] Get 18.3kg purity to be 85% lightly burned magnesia, particle size 200 orders. First, mix evenly with 250g of high-purity graphite powder and raw materials. In addition, 60g of titanium oxide was sprinkled in layers. The stockpile was then compacted with weights for 26 hours. A three-phase electric arc furnace with a power of 30KVA is used for smelting, and 15g of lanthanum oxide and 5g of cerium oxide are added at the time of the first feeding. The melting time is 7 hours, during which the voltage is 70-80V and the current is 200-300A. Finally, high-purity white and transparent large-crystal fused magnesia is obtained, and the magnesium oxide content is above 99.10%. Five samples were obtained for ICP-AES detection, and the measured results are as follows:

[0035]

Embodiment 3

[0037] Get 14.0kg purity and be 85% lightly burned magnesia, particle size 200 orders. First use 300g of high-purity graphite powder and raw materials to mix evenly. In addition, 70g of titanium oxide was sprinkled in layers. The stockpile was then compacted with weights for 28 hours. A three-phase electric arc furnace with a power of 30KVA is used for melting, and 5g of lanthanum oxide and 15g of cerium oxide are added at the time of the first feeding. The melting time is 10 hours, during which the voltage is 60-70V and the current is 80-350A. Finally, high-purity white and transparent large-crystal fused magnesia is obtained, and the magnesium oxide content is above 99.40%. Three samples were obtained for ICP-AES detection, and the measured results are as follows:

[0038]

[0039] The additives of the present invention replace expensive rare earth alloy materials with oxides in a combined state. The main components are high-purity graphite powder, lanthanum oxide, ce...

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Abstract

The invention relates to an additive for producing high-purity fused magnesite. The main components of the additive are high-purity graphite powder, rare earth oxide and titanium oxide. The additive is characterized in that the adding dosage of the high-purity graphite powder is 0.5-5% of the mass of magnesium oxide; the adding dosage of the rare earth oxide is 0.01-0.5% of the mass of magnesium oxide; the adding dosage of titanium oxide is 0.1-5% of the mass of magnesium oxide. In the additive provided by the invention, the chemical form oxides are used for replacing an expensive rear earth alloy material, the main components of the additive are high-purity graphite powder, such rare earth oxide combinations as lanthanum oxide, cerium oxide and the like and titanium oxide, and the components are added in the raw material in different smelting stages; impurity removal and purification are performed by means of the excellent properties of the rare earth oxide and titanium oxide, and massive white transparent high-purity fused magnesia is obtained by appropriate process flows.

Description

【Technical field】 [0001] The invention relates to the technical field of refractory production, in particular to an additive for producing high-purity fused magnesia. 【Background technique】 [0002] Most of the existing high-purity fused magnesia smelting directly uses natural magnesite ore or light-burned magnesia to smelt directly in a three-phase electric arc furnace. The smelting time is long, the utilization rate of raw materials is low, and the environmental pollution is serious. The purity of fused magnesia produced is mostly lower than 98%, and the content of impurities is high, especially SiO 2 , Fe 2 o 3 , CaO, A1 2 o 3 The content is high, and the color of the product is mostly not pure white and transparent, and yellow, brown and green appear to varying degrees, which cannot meet the use requirements of specific fields. [0003] According to the national standard YB / T5266-2004, the specific physical and chemical properties of fused magnesia are shown in Tabl...

Claims

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Application Information

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IPC IPC(8): C04B2/10
Inventor 路贵民谢祥杜玮汪尹雄宋兴福孙泽
Owner EAST CHINA UNIV OF SCI & TECH
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