Middle-heavy refractory castable in working linings of industrial furnaces and preparation method of refractory castable

Abstract

The invention discloses a middle-heavy refractory castable in working linings of industrial furnaces and a preparation method of the refractory castable. The refractory castable comprises the following components in mass percentage: 10-30% of complex-phase hollow balls with a particle size of 6 mm, 15-35 % of complex-phase hollow balls with a particle size of 4 mm, 10-25% of mullite with a particle size of 1-0 mm, 5-25% of kyanite with a particle size of 180 mesh, 5-15% of mullite powder with a particle size of 200 mesh, 5-10% of pure calcium aluminate cement, 3-8% of alumina micro powder with a particle size lower than 5 micron, 3-8% of silicon dioxide micro powder with a particle size lower than 1 micron and 0.1-0.2% of an additionally-added water reducing agent. The refractory castable provided by the invention has excellent characteristics of a long-term high usage temperature, moderate volume density, a low thermal conductivity coefficient and good thermal shock stability, can replace conventional heavy refractory castable for direct use in working linings of industrial furnaces, and has a very positive effect on energy saving and consumption reducing of industrial furnaces, and on decrease of usage amounts of lining materials and thickness of linings in industrial furnaces, and the like.

Description

technical field [0001] The invention belongs to the technical field of refractory castables, and in particular relates to a medium-heavy refractory castable for the working lining of an industrial kiln. Background technique [0002] With the increasing tension of world energy and the rapid development of various high-temperature industrial kilns, energy issues have increasingly become one of the restrictive factors for the sustainable development of high-temperature industries. In order to maintain healthy and stable development of high-temperature industries, various energy-saving technologies, energy-saving Materials have become the focus of research and development by engineers and technicians. [0003] The main items of industrial furnace heat loss are exhaust smoke loss, heat absorption of water-cooled components in the furnace, heat dissipation of the furnace body, etc. The energy-saving measures of the furnace should first reduce these heat losses, and secondly reco...

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Problems solved by technology

[0012] It can be seen from Table 2 that heavy refractory materials have high thermal conductivity under the operating temperature conditions of industrial kilns. Therefore, using heavy refractory materials as furnace lining will bring greater heat loss

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