Lightweight periclase-aluminum spinel refractory material and preparation method thereof

Abstract

The invention relates to a lightweight periclase- hercynite refractory material and a preparation method thereof. The refractory material contains 10-20 wt% of porous periclase-hercynite ceramic material particles with the particle size of 3-5 mm, 30-40% of porous periclase-hercynite ceramic material particles with the particle size being 1-2.8 mm and 10-15 wt% of nano-aperture porous periclase-hercynite ceramic material particles with the particle size of 0.1-0.8 mm as aggregates, contains 8-15 wt% of nano-aperture porous periclase-hercynite ceramic material fine powder, 10-15 wt% of hercynite-corundum composite fine powder and 10-20 wt% of magnesia fine powder as a matrix, and also contains a binder accounting for 2-8% of the weight of the aggregates and the matrix. The preparation method comprises the following steps: placing the aggregates in a vacuum stirrer, carrying out vacuum pumping, adding the binder, stirring the aggregates and the binder, and stopping a vacuum pumping system; and adding the matrix, stirring the aggregates, the binder and the matrix, forming the obtained mixture, drying the formed mixture, keeping the temperature in a range of 1500-1650 DEG C, and cooling the obtained mixture to obtain the lightweight periclase-hercynite refractory material. The pores of the above obtained product are nano-pores, and the refractory material has the advantages of low heat conduction coefficient, good erosion resistance, excellent kiln coating adherence and high thermal shock resistance.

Description

technical field [0001] The invention belongs to the technical field of periclase-aluminum spinel refractory materials. In particular, it relates to a lightweight periclase-aluminum spinel refractory material and a preparation method thereof. Background technique [0002] Periclase-aluminum spinel refractory has been widely used in the burning zone of cement rotary kiln using coal powder as fuel because of its excellent high temperature stability and kiln skin hanging performance. The existing periclase-ferrite-aluminum spinel refractories are generally made of sintered or fused magnesia as raw materials, with high bulk density and high thermal conductivity. During use, on the one hand, it will cause cement rotary kiln shell If the temperature is too high, it will cause a large amount of heat loss. On the other hand, it will increase the weight of the rotary kiln, increase the stress of the cylinder in the belt area, accelerate the deformation of the cylinder, and increase s...

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Problems solved by technology

For example, the patented technology of "periclase-magnesia-iron-aluminum spinel / forsterite composite brick (ZL201510104066)" has prepared a composite refractory material with a working layer and a heat insulating layer. The preparation process is complicated, and the strength of the heat insulating layer is relatively high. low, and the thermal insulation layer and the dense layer are prone to cracks due to the mismatch of thermal properties, which seriously affects the service life; another example is "a low thermal conductivity magnesia-iron-aluminum spinel brick for cement rotary kiln and its production method (ZL201610021949.9 )” patented technology, using polypropylene fiber as a pore-forming agent to prepare a low thermal conductivity magnesium-iron-aluminum spinel refractory material with fibrous micropores. Erosion by media such as sulfide and saline-alkali; another example is the patented technology of "lightweight periclase-magnesia-alumina-spinel refractory material for cement rotary kiln and its preparation method (ZL201410059476.2)", which uses porous periclase-spinel Stone ceramic materials are used as raw materials instead of dense magnesia, and lightweight refractory materials with low thermal conductivity are produced. However, the pores of lightweight refractory materials have large pore diameters, high air permeability, and poor erosion resistance to sulfide and saline-alkali media.