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Chromium-free fireclay for ladle sliding plate nozzle and preparation method thereof

A sliding plate and nozzle technology, applied in the field of refractory materials, can solve the problems affecting the trace components of molten steel, human body and environmental pollution, and achieve the effects of promoting mutual integration, high flexural strength, and reducing line change rate

Pending Publication Date: 2021-06-01
唐山市曹妃甸区节能耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the joint mud between the upper and lower plates and the upper and lower nozzle bricks in the ladle system is chromium-containing joint mud. The chromium-containing joint mud not only affects the trace components of molten steel, but also the trivalent chromium in the fire mud is transformed into After hexavalent chromium, it will also pollute the human body and the environment

Method used

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  • Chromium-free fireclay for ladle sliding plate nozzle and preparation method thereof
  • Chromium-free fireclay for ladle sliding plate nozzle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A chrome-free cement for a ladle skateboard nozzle, comprising the following components by weight percentage:

[0029] Fused white corundum 40%, sintered tabular alumina 25%, α-Al 2 o 3 Powder 15%, fused spinel 13.85%, lime clay 6%, yellow dextrin 0.01%, sodium carboxymethylcellulose 0.1%, polycarboxylate superplasticizer 0.01%, sodium hexametaphosphate 0.01%, Sodium Tripolyphosphate 0.01% and Aluminum Dihydrogen Phosphate 0.01%.

[0030] The particle diameters of the fused white corundum and the sintered tabular alumina are both 100-200 mesh;

[0031] α-Al 2 o 3 The particle size of the powder is 200-300 mesh;

[0032] The particle size of fused spinel is 100-200 mesh;

[0033] The particle size of white mud, yellow dextrin, sodium carboxymethyl cellulose and polycarboxylate superplasticizer is 100-200 mesh;

[0034] The particle size of sodium hexametaphosphate, sodium tripolyphosphate and aluminum dihydrogen phosphate is 40-100 mesh.

[0035] The preparation ...

Embodiment 2

[0038] A chrome-free cement for a ladle skateboard nozzle, comprising the following components by weight percentage:

[0039] Fused white corundum 55%, sintered tabular alumina 15%, α-Al 2 o 3 Powder 7.87%, fused spinel 20%, white mud 1%, yellow dextrin 0.03%, sodium carboxymethylcellulose 0.5%, polycarboxylate superplasticizer 0.1%, sodium hexametaphosphate 0.2%, three Sodium polyphosphate 0.2% and aluminum dihydrogen phosphate 0.1%.

[0040] The particle diameters of the fused white corundum and the sintered tabular alumina are both 100-200 mesh;

[0041] α-Al 2 o 3 The particle size of the powder is 200-300 mesh;

[0042] The particle size of fused spinel is 100-200 mesh;

[0043] The particle size of white mud, yellow dextrin, sodium carboxymethyl cellulose and polycarboxylate superplasticizer is 100-200 mesh;

[0044] The particle size of sodium hexametaphosphate, sodium tripolyphosphate and aluminum dihydrogen phosphate is 40-100 mesh.

[0045] The preparation me...

Embodiment 3

[0048] A chrome-free cement for a ladle skateboard nozzle, comprising the following components by weight percentage:

[0049] Fused white corundum 54.48%, sintered tabular alumina 25%, α-Al 2 o 3 Powder 5%, fused spinel 10%, white mud 5%, yellow dextrin 0.02%, sodium carboxymethylcellulose 0.3%, polycarboxylate superplasticizer 0.05%, sodium hexametaphosphate 0.05%, three Sodium polyphosphate 0.05% and aluminum dihydrogen phosphate 0.05%.

[0050] The particle diameters of the fused white corundum and the sintered tabular alumina are both 200-400 mesh;

[0051] α-Al 2 o 3 The particle size of the powder is 600-800 mesh;

[0052] The particle size of fused spinel is 200-300 mesh;

[0053] The particle size of white mud, yellow dextrin, sodium carboxymethyl cellulose and polycarboxylate superplasticizer is 100-200 mesh;

[0054] The particle size of sodium hexametaphosphate, sodium tripolyphosphate and aluminum dihydrogen phosphate is 40-100 mesh.

[0055] The preparatio...

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Abstract

The invention provides a chromium-free fireclay for a ladle sliding plate nozzle, and fused white corundum can improve the high temperature resistance of the finally obtained chromium-free fireclay; under the combined action of the sintered tabular corundum and the alpha-Al2O3 powder, the medium-high temperature linear change rate of the chromium-free fireclay is greatly reduced; the high-temperature thermal shock stability of the chromium-free fireclay is remarkably improved by adding the fused spinel; white mud, yellow dextrin, carboxymethyl cellulose sodium, a polycarboxylate superplasticizer, sodium hexametaphosphate, sodium tripolyphosphate and aluminum dihydrogen phosphate act together, on the one hand, chromium oxide is replaced to play a role of a binding agent, mutual fusion of other components is promoted, the strength of the chromium-free fireclay is improved, on the other hand, in the using process, the using performance of the chromium-free fireclay is guaranteed in the initial using stage, part of the components are decomposed at high temperature, so that the high temperature resistance and the mechanical property of the chromium-free fireclay are not influenced. Through interaction of all the components, the obtained chromium-free fireclay has the excellent performance of small linear change rate, high breaking strength and high compression strength.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a chromium-free fire clay for a ladle slide nozzle and a preparation method thereof. Background technique [0002] At present, the joint mud between the upper and lower plates and the upper and lower nozzle bricks in the ladle system is chromium-containing joint mud. The chromium-containing joint mud not only affects the trace components of molten steel, but also the trivalent chromium in the fire mud is transformed into After hexavalent chromium, it will also pollute the human body and the environment. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides a chrome-free cement for the ladle slide nozzle with small line change, high flexural strength, high compressive strength and no pollution. [0004] The chromium-free cement for the ladle slide nozzle provided by the invention comprises the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/101
CPCC04B35/101C04B2235/3222C04B2235/447C04B2235/9615C04B2235/96
Inventor 崔泰贾祥超赵丽明安永超
Owner 唐山市曹妃甸区节能耐火材料有限公司
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