Phosphoric acid and spinel combined high aluminia pouring material

A high-aluminum castable and castable technology, which is applied in the field of refractory materials, can solve the problems of reduced refractoriness, low strength, pouring construction, demoulding, baking and other technical difficulties of castables.

Inactive Publication Date: 2003-05-21
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using high alumina cement as coagulant, due to the introduction of a certain amount of CaO, the refractoriness and other properties of the castable will be reduced
When MgO fine powder is used as coagulant, it can chemically react with phosphoric acid to make the refractory castable coagulate and harden at room temperature. Baking and other processes bring difficulties, and studies have shown that if MgO is used as a coagulant, the strength after hardening is very low

Method used

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  • Phosphoric acid and spinel combined high aluminia pouring material
  • Phosphoric acid and spinel combined high aluminia pouring material

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Experimental program
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Embodiment Construction

[0018] according to figure 1 As shown, take special grade alumina: 3-5mm coarse particles 27.5%, 2-3mm medium particles 27.5%, 0-2mm fine particles 27%, <0.088mm fine powder 6%, <0.088mm alkaline fused spinel 12%. Phosphoric acid was added with an additional 14% of the total weight added. The samples were prepared by vibrating on a vibrating table. The samples were demolded one day after molding, and then naturally cured for two days, that is to say, the natural curing time after taking the mold and demoulding was three days in total. After drying at 110°C, drying at 450°C, calcining at 1300°C for 3 hours, and calcining at 1450°C for 3 hours, the finished product is obtained after cutting and grinding. The main performance index of the product obtained is as follows:

[0019] Bulk density (g / cm 3 )(dried at 110°C) 2.89

[0020] Strength after three days of natural curing (MPa) Flexural 7.8

[0021] Compression 32.5

[0022] 110℃×24h post-ba...

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Abstract

The present invention belongs to the field of refractory material, specially, it is suitable for producing phosphoric acid combined high-aluminium pouring material. It is characterized by that it uses electrocast spinel as coagulation accelerator or phosphoric acid combined pouring material, its main raw material is a high-grade high-alumina, and its secondary raw material is electrocast magnesia-alumina spinel and phosphoric acid. Said inention is easy to construct and easy to remove form, and has higher strength, after the form of removed for 3 days, it is water resistant.

Description

Technical field: [0001] The invention belongs to the field of refractory materials, and is particularly suitable for producing phosphoric acid-bonded high-alumina castables. Background technique: [0002] At present, the main coagulants of phosphoric acid-bonded high-alumina castables in China are high-alumina cement and MgO fine powder. Using high-alumina cement as a coagulant, due to the introduction of a certain amount of CaO, the refractoriness and other properties of the castable will be reduced. When MgO fine powder is used as coagulant, it can chemically react with phosphoric acid to make the refractory castable coagulate and harden at room temperature. Baking and other processes bring difficulties, and studies have shown that if MgO is used as a coagulant, its strength after hardening is very low. Invention content: [0003] The purpose of the present invention is to find a material to replace high-alumina cement or MgO fine powder as a coagulant, so that it can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/101C04B35/443C04B35/447C04B35/66
Inventor 倪文李淑琴
Owner UNIV OF SCI & TECH BEIJING
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