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Insulating and refractory mortar for induction coils and preparation process thereof

The technology of refractory mortar and induction coil is applied in the field of refractory materials, which can solve the problems of large brittleness of forming furnace lining, complex production process, poor bonding performance, etc., and achieve the effect of changing the sintering forming process, improving the bulk density and improving the insulation performance.

Inactive Publication Date: 2010-04-14
长沙环宇耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improper operation or lack of maintenance can easily lead to furnace break-through accidents
[0003] The existing induction coil insulation furnace lining is mostly made of high-alumina ceramics or quartz glass tubes. The formed furnace lining made of this kind of composition is very brittle and easy to crack during use.
The reason is that the bonding composition particles in the composition are large, and the bonding performance between the bonding material and other compositions is poor, resulting in low thermal shock resistance of the furnace lining, low high temperature strength, poor thermal stability, slag resistance and liquid steel resistance. Low, at the same time need high temperature sintering, complex manufacturing process and high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The total amount of ingredients is 400kg. Weigh items ①②③④⑤⑥⑦ according to the mass percentage of each component and add them to the batching tank. 72kg white corundum (325 mesh), 77kg aluminate cement, 28kg Yixing white clay, 12kgα-Al 2 o 3 , 1.72kg silica fume-90, reserve 3kg of aluminate cement for later use; then add 0.08kg sodium tripolyphosphate, 2.0kg aluminum dihydrogen phosphate, 0.2kg sodium hexametaphosphate in sequence, and add after each item 1kg of aluminate cement, mix quickly; finally pour the prepared material into the mixer, turn it forward and reverse for 10 minutes, take a sample and test it, then pack it into the warehouse.

[0032] The sampling test results are as follows:

[0033] 1. Physical and chemical indicators

[0034] Element

AL 2 o 3

SiO 2

CaO

Fe 2 o 3

R 2 o

TiO 2

Mass percentage

≥90

≤3.5

≤4.5

≤0.15

≤0.05

≤0.5

[0035] 2. Physical properti...

Embodiment 2

[0044] The total amount of ingredients is 400kg. Weigh items ①②③④⑤⑥⑦ according to the mass percentage of each component and add them to the batching tank. 72kg brown corundum (325 mesh), 77kg aluminate cement, 28kg Yixing white clay, 12kgα-Al 2 o 3 , 1.72kg silica fume-90, reserve 3kg of aluminate cement for later use; then add 0.08kg sodium tripolyphosphate, 2.0kg aluminum dihydrogen phosphate, 0.2kg sodium hexametaphosphate in sequence, and add after each item 1kg of aluminate cement, mix quickly; finally pour the prepared material into the mixer, turn it forward and reverse for 10 minutes, take a sample and test it, then pack it into the warehouse.

[0045] The sampling test results are as follows:

[0046] 1. Physical and chemical indicators

[0047] Element

AL 2 o 3

SiO 2

CaO

Fe 2 o 3

R 2 o

TiO 2

Mass percentage

≥90

≤3.5

≤4.5

≤0.15

≤0.05

≤0.5

[0048] 2. Physical properti...

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PUM

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Abstract

The invention discloses insulating and refractory mortar for induction coils, which comprises the following components in percent by weight: 30 percent of 0-1 mm white alundum, 21 percent of 200 mesh white alundum, 18 percent of 325 mesh white alundum, 20 percent of aluminate cement, 7 percent of Yixing white mud, 33 percent of alpha-Al2O33, 0.3-0.7 percent of 90 silica fume, 0.01-.04 percent of sodium tripolyphosphate, 0.3-0.8 percent of aluminium dihydrogen phosphate and 0.03-0.08 percent of sodium hexametaphosphate, wherein the white alundum can be replaced by brown alundum. The invention also provides a preparation process of the insulating and refractory mortar for induction coils. The insulating and refractory mortar for induction coils has high compactness, low thermal conductivity and low calorific capacity; and for a molding lining prepared by using the insulating and refractory mortar, the thickness is reduced by half, the material is saved by more than half, and the service life is doubled or more.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to an induction coil insulation refractory cement and a preparation process thereof. Background technique [0002] Induction furnaces have been widely used in non-ferrous and ferrous metal smelting due to a series of advantages. The working environment of the lining material is very harsh. Cooled by the cooling water of the inductor, there is a large temperature gradient in the furnace lining; in addition, the molten metal in the furnace is subjected to intense electromagnetic stirring, which causes strong mechanical damage to the furnace lining; periodic intermittent operations will also cause the furnace lining to be subjected to repeated shocks. Hot and cold damage. Improper operation or lack of maintenance can easily lead to furnace break-through accidents. [0003] Most of the existing induction coil insulation furnace linings use high-alumina ceramic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 卢亚张建奇
Owner 长沙环宇耐火材料有限公司