Forsterite-C-contained MgO-SiC-C fire-resistant material and preparation thereof

Abstract

The invention relates to a forsterite-C-containing MgO-SiC-C material refractory and a method for preparing the same. The technical scheme comprises firstly mixing the 25-40wt% of magnesia particles with a grain size of 3-1mm, 20-35wt% of magnesia particles with a grain size of 1-0mm, 5-40wt% of forsterite-C mixed fine powders and 0-35wt% of magnesia fine powders, adding a 4-10wt% of bonding agent accounting for the weight of the mixed material, stirring or mulling for 10-30 minutes, drying after pressing formation, sintering at a reductive atmosphere with a sintering temperature of 1450-1700 DEG C and a heat preservation time of 4-8 hours, getting the MgO-SiC-C material composite refractory. The MgO-SiC-C material refractory prepared by adding the forsterite and carbon not only can solve the problem of magnesia resource shortage, reduces the production cost, but also the SiC prepared by the reaction of magnesia and carbon at a high temperature can reinforce the conjugation inside the material, and be useful for improving the refractory performance. The invention can also adopt low grade magnesia.

Description

technical field [0001] The invention belongs to the use of magnesia, forsterite (2MgO·SiO 2 ), industrial carbon powder (C) as the base material in the field of composite refractories. In particular, it relates to a MgO-SiC-C refractory material containing forsterite-C and a preparation method thereof. Background technique [0002] MgO-SiC-C composite materials have excellent high temperature resistance and thermal stability, can be used in non-ferrous metals and iron and steel smelting equipment, and can also be prepared into high-quality high temperature resistant heat insulation materials and wall materials for high temperature kilns, especially It is suitable for the ladle lining and refining furnace lining of clean steel such as low carbon steel and ultra-low carbon steel, replacing MgO-C material, which is beneficial to the quality of steel and has a good use effect. [0003] The existing production and preparation method of MgO-SiC-C refractories is to use magnesia ...

AI Technical Summary

Problems solved by technology

[0003] The existing production and preparation method of MgO-SiC-C refractories is to use magnesia and industrial SiC as the main raw materials, use phenolic resin as the binder, adopt mechanical mixing and then press and press to form the production (such as ZL200610019553.7 ), the advantage of this method is to replace graphite (C) with industrial SiC to ensure the corrosion resistance and thermal shock resistance of the material. The problem is that this method requires high-grade magnesia, and the magnesia resource is increasingly tense , the price of industrial SiC is expensive, and the market price of magnesia and industrial SiC is getting higher and higher, and the production cost of MgO-SiC-C composite materials is also increasing; in addition, MgO and SiC are combined by phenolic resin, However, the bonding effect is poor at high temperature, which affects the high temperature strength and erosion resistance of the material