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Neutral lining of medium-frequency induction furnace for smelting of sintered neodymium-iron-boron permanent-magnet material

A permanent magnet material and neutral furnace lining technology, applied in the direction of lining repair, etc., can solve the problems of furnace lining knotting, improper oven process, poor expansion and contraction uniformity, and poor cold and thermal shock resistance, so as to shorten the oven time, The effect of long oven time and high refractoriness

Inactive Publication Date: 2014-04-02
HUNAN AEROSPACE MAGNET & MAGNETO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the production of domestic NdFeB smelting furnace linings, there are generally problems of improper formula, lining knotting and improper oven technology, resulting in insufficient refractoriness of the furnace lining, low load softening point, poor stability, poor thermal shock resistance, and poor expansion and contraction uniformity. , the average furnace life of many NdFeB manufacturing enterprises is only about 35 furnaces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Material preparation for furnace bottom and furnace wall: 75kg of high-alumina bauxite clinker, 25kg of magnesia, 100kg in total, 1.5% boric acid, 6% water glass, 1.7-6.0% in high-alumina bauxite clinker The mass ratio of mm particles, 0.8-1.7mm particles, 0.15-0.8mm particles, and particles smaller than 0.15mm is 20:25:25:30. Specifically ： Weigh 15kg of 1.7-6.0mm high-alumina bauxite clinker particles, 18.75kg of 0.8-1.7mm high-alumina bauxite clinker particles, 18.75kg of 0.15-0.8mm high-alumina bauxite clinker particles, less than 22.5kg of 0.15mm high alumina bauxite clinker particles, 25kg of 180-300 mesh magnesia particles, 1.5kg of boric acid, 6kg of water glass, mixed and stirred for 15min, and set aside;

[0040] Material preparation for furnace mouth: 20kg of high-alumina bauxite clinker, 4kg of magnesia, 24kg in total, 1.5% boric acid, 10% water glass, 1.7-6.0mm particles in high-alumina bauxite clinker, 0.8-1.7 The mass ratio of mm particles, 0.15-0.8...

Embodiment 2

[0051] (1) Furnace bottom and furnace wall material preparation: 80kg of high-alumina bauxite clinker, 20kg of magnesia, 100kg in total, 1.5% boric acid, 1.7-6.0mm particles in high-alumina bauxite clinker, 0.8-1.7 The mass ratio of mm particles, 0.15-0.8mm particles, and particles smaller than 0.15mm is 15:25:30:30. Specifically ： Weigh 12kg of 1.7-6.0mm high-alumina bauxite clinker particles, 20kg of 0.8-1.7mm high-alumina bauxite clinker particles, 24kg of 0.15-0.8mm high-alumina bauxite clinker particles, less than 0.15mm 24kg of high-alumina bauxite clinker particles, 20kg of 180-300 mesh magnesia particles, and 1.5kg of boric acid as an additive; mix and stir for 15 minutes, and set aside;

[0052] (2) Furnace mouth material preparation: 24kg of high-alumina bauxite clinker, 6kg of magnesia, 30kg in total, 1.5% boric acid, 10% water glass, 1.7-6.0mm particles in high-alumina bauxite clinker, 0.8 The mass ratio of -1.7mm particles, 0.15-0.8mm particles and particles sma...

Embodiment 3

[0056] (1) Furnace bottom and furnace wall material preparation: 85kg of high-alumina bauxite clinker, 15kg of magnesia, 100kg in total, 1.5% boric acid, 7% water glass, 1.7-6.0mm in high-alumina bauxite clinker The mass ratio of granules, 0.8-1.7mm granules, 0.15-0.8mm granules, and less than 0.15mm granules is 15:25:20:40. Specifically ： Weigh 12.75kg of 1.7-6.0mm high-alumina bauxite clinker particles, 21.25kg of 0.8-1.7mm high-alumina bauxite clinker particles, 17kg of 0.15-0.8mm high-alumina bauxite clinker particles, less than 34kg of 0.15mm high alumina bauxite clinker particles, 15kg of 180-300 mesh magnesia particles, 1.5kg of boric acid and 7kg of water glass as additives; mix and stir for 15min, set aside;

[0057] (2) Furnace mouth material preparation: 24kg of high-alumina bauxite clinker, 6kg of magnesia, 30kg in total, 1.5% boric acid, 10% water glass, 1.7-6.0mm particles in high-alumina bauxite clinker, 0.8 The mass ratio of -1.7mm particles, 0.15-0.8mm parti...

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Abstract

The invention relates to a neutral lining of a medium-frequency induction furnace for smelting of a sintered neodymium-iron-boron permanent-magnet material, which is manufactured through the following steps: proportionally mixing high-alumina bauxite chamotte used as a main raw material and added magnesia powder and admixture, uniformly stirring, ramming and baking. The neutral lining obtained by the invention has the characteristics of high refractoriness, excellent chemical property stability and volume stability, favorable thermal shock resistance, convenient and quick furnace building process, short furnace baking time, long furnace life, low comprehensive cost and the like.

Description

technical field [0001] The invention relates to a neutral furnace lining, in particular to a neutral furnace lining of an intermediate frequency induction furnace for smelting sintered NdFeB permanent magnet materials. Background technique [0002] At present, the smelting of sintered NdFeB permanent magnet materials in China generally adopts the quick-setting and throwing technology of intermediate frequency induction furnaces. The service life of intermediate frequency induction furnaces is largely determined by the lining, which requires sufficient refractoriness and good stability. Strong high-temperature pressure-bearing capacity, uniform expansion and contraction performance in all directions, good insulation, good construction, and cheap price. The furnace lining transfers heating energy during the smelting process, and it is easy to generate cracks under the impact of the furnace material, the static pressure of the melt, the shock and heat, and the unevenness of hea...

Claims

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Application Information

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IPC IPC(8): C04B35/66F27D1/16
Inventor 柯彬胡盛青何卫阳赵宝宝
Owner HUNAN AEROSPACE MAGNET & MAGNETO
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