Periclase-hercynite refractory material and preparation method thereof

Abstract

The invention relates to a periclase-hercynite refractory material and a preparation method thereof. The adopted technical scheme comprises the following steps: mixing 80 to 98wt% of magnesia and 2 to 20wt% of hercynite-corundum composite material, adding a binding agent accounting for 3 to 8wt% of the mixture, uniformly stirring raw materials, and molding through mechanical pressing; then dryingthe molded billet for 8 to 36 hours under the condition of 110 DEG C, then sintering under the condition of 1450 to 1650 DEG C, and preserving heat for 4 to 15 hours to obtain the periclase-hercyniterefractory material. The prepared product has the main phases of periclase and hercynite, contains a small amount of magnesia-alumina spinel and is the periclase-hercynite refractory material which not only has higher kiln crust adhesiveness, higher refractoriness and good anticorrosion capability of alkali, sulfur, chlorine, clinkers and the like, but also has higher loading softening temperature, higher high-temperature strength and better thermal shock stability.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a periclase-aluminum spinel refractory material and a preparation method thereof. Background technique [0002] Since the 1960s, the direct combination of magnesia-chrome bricks has been widely used in the firing zone of cement kilns due to its excellent high-temperature performance, but magnesia-chrome bricks will produce toxic Cr when used. 6+ . In order to solve the problem of environmental pollution caused by traditional magnesia-chrome bricks, chromium-free basic refractories have become the focus of research. At present, the chromium-free basic refractory materials that replace magnesia-chrome bricks mainly include periclase-magnesia-aluminum spinel bricks and periclase-iron-aluminum spinel bricks. Periclase-magnesia-aluminum spinel bricks have a higher load softening temperature, higher high-temperature strength and better thermal shock stabilit...

AI Technical Summary

Problems solved by technology

Periclase-magnesia-aluminum spinel bricks have a higher load softening temperature, higher high-temperature strength and better thermal shock stability (Journal of the European Ceramic Society, 2004, 24: 2079-2085), but its The kiln skin has poor adhesion and poor corrosion resistance to alkali, sulfur, chlorine and clinker

Although periclase-iron-aluminum spinel bricks have good kiln skin adhesion, high refractoriness, good thermal shock stability and strong corrosion resistance to alkali, sulfur, chlorine and clinker, etc. (RHI, Bull, 2003, 1: 25~28), but there are some problems in the production of its key material, iron-aluminum spinel: since iron-aluminum spinel needs to be generated under a certain partial pressure of CO, sintering It is difficult to control the production by the method, so the electrofusion method is often used for synthesis, but in the melting process, if the ingredients are shifted to the direction of high iron oxide content, it is easy to produce too much liquid phase, which leads to the control of the production of iron-aluminum spinel Difficult; in the existing electro-melted iron-aluminum spinel preparation process, such as Al 2 o 3 When iron-aluminum spinel is prepared by electromelting with Fe as raw material (Journal of Magnetism and Magnetic Materials, 2003, 264: 264-274), the reaction process is difficult to control and the reaction is not sufficient; to analyze pure Al 2 o 3 powder, analytically pure Fe 2 o 3 When powder and iron scale are used as raw materials to prepare iron-aluminum spinel by electromelting (Silicate Bulletin, 2007, 26(5): 1003-1006), although the process is simple, the analytically pure Al 2 o 3 powder and analytically pure Fe 2 o 3 Powder price is too high, resulting in too high cost, not suitable for large-scale industrial production

Large fluctuations in the composition and unstable quality of Fe-Al spinel, resulting in poor product performance