Light cordierite-spinel castable and preparation method thereof

Abstract

The invention relates to a light cordierite-spinel castable and a preparation method thereof. The technical scheme includes that 40wt. %-70wt. % of porous cordierite ceramic particles, 5wt. %-15wt. % of magnesium oxide fine powders, 11wt. %-30wt. % of industrial alumina fine powders, 2wt. %-8wt. % of active Al2O3 fine powders, 2wt. %-10wt. % of silicon oxide micro powders and 1wt. %-14wt. % of silica fine powders are used as raw materials, and water and water reducing agents are added for being uniformly stirred and molded by casting, wherein the water is 8wt. %-20wt. % of the raw materials, and the water reducing agents is 0.02wt. %-1wt. % of the raw materials; a molded green body is naturally dried for 24 hours and then dried for 8-48 hours under the condition of 110 DEG C to prepare the light cordierite-spinel castable. The preparation method is simple, and the light cordierite-spinel castable has the advantages of being convenient to construct, environment-friendly, controllable and high in apparent porosity, controllable in pore sizes and burnt volume, small in average pore sizes, low in heat conductivity, high in strength, good in thermal shock stability, high in medium corrosion resistance capability, high in using temperatures and applicable to a permanent layer or a work layer of a high temperature kiln or a container with working temperatures lower than 1410 DEG C.

Description

technical field [0001] The invention belongs to the technical field of lightweight castables. In particular, it relates to a cordierite-spinel lightweight castable and a preparation method thereof. Background technique [0002] Castable is a kind of unshaped refractory material, which has the advantages of easy construction, not limited by the shape of the kiln structure, and can be conveniently made into different shapes of furnace linings. With the increasing demand for energy saving and emission reduction, the development of environmentally friendly and efficient lightweight castables has attracted more and more attention. [0003] Cordierite is a silicate mineral with the chemical formula 2MgO 2Al 2 o 3 ·5SiO2 2 , has a small coefficient of thermal expansion, excellent thermal shock resistance, low thermal conductivity and good chemical stability. Magnesium aluminum spinel (spinel for short) is MgO-Al 2 o 3 The only stable intermediate compound in the binary syste...

AI Technical Summary

Problems solved by technology

[0004]Research on cordierite lightweight castables and cordierite-spinel lightweight materials has made some progress, but there are some problems: such as "a cordierite lightweight castable High-quality castable and its preparation method” (CN201210272265.8) patented technology, which uses porous cordierite ceramics as aggregate to prepare lightweight castable, but it uses calcium aluminate cement as binder, that is, in MgO-Al2 O3-SiO2 The introduction of CaO in the ternary system reduces the eutectic temperature and limits the maximum service temperature; "Low thermal expansion and high strength cordierite "Manufacture of structure" (ZL99813431.7) patented technology, using extrusion molding method to prepare a cordierite ceramic rod with a certain porosity, with cordierite as the main crystal phase and spinel as the secondary crystal phase, but a On the one hand, the products prepared by the extrusion molding method cannot be poured into integral furnace lining materials on site, and refractory materials with complex structures cannot be prepared. On the other hand, the highest porosity of this patented product is only 37%, and it is a homogeneous material, which has excellent thermal insulation effect and medium corrosion resistance. Poor capabilities;

Foreign refractory materials, 2006, 31 (2): 21-24 "literature technology using MgO-Al2O3-SiO2 The porous ceramic film containing spinel and cordierite is prepared by selective dealkalization as the raw material, but the preparation process is complicated, the production cost is high, and it is not suitable for on-site casting into integral furnace lining material and the preparation of refractory materials with complex structure ;"MgO-Al2O3-SiO2 refractory ceramics formed from recycled materials

Refractory and Lime, 2008, 33 (5): 41-45 "Refractory technology first uses chemical methods to process raw materials, and then uses machine press molding to prepare refractory cordierite-spinel materials with pores, but the preparation process Complicated and shaped products, it is also not suitable for on-site casting into integral furnace lining materials and preparation of refractory materials with complex structures