Ferrous aluminum and magnesium system refractory raw material and preparation method thereof

Abstract

The invention provides a ferrous aluminum and magnesium system refractory raw material which is a multiple solid solution or composite of ferrous aluminate spinel and / or alumina spinel and / or ferromagnesium solid solution and / or pleonaste. The refractory raw material is prepared by the following steps of: mixing a ferrous compound, an aluminum-containing compound and a magnesium oxide-containing compound according to the ratio; additionally adding 1-6 percent bonding agent; mixing, forming and drying a blank; maintaining the mixture in a high-temperature kiln in the nitrogen atmosphere at the temperature of 1,400-1,700DEG C for 2-8 hours; and naturally cooling and taking out the product. In the scheme, the granularities of the alumina-containing raw material and the ferrous raw material are less than 180 meshes. The invention aims at synthesizing the ferrous aluminum and magnesium system refractory raw material with stable performance and avoids the volume effect due to the change of ferrum among different valence states. The method has simple synthesis process and is easy to implement.

Description

technical field

[0001] The invention belongs to the technical field of refractory materials, and relates to a method for synthesizing ferrous-aluminum-magnesium series refractory raw materials. Background technique

[0002] Researchers from Austrian Magnesium Corporation (RHI) found that the introduction of ferrous aluminum spinel into magnesia materials not only cannot greatly reduce the high temperature performance of the material, but also can significantly improve the hanging of magnesia materials in cement rotary kilns. Therefore, magnesia bricks added with ferrous spinel have become the most promising chrome-free materials to completely replace magnesia-chrome bricks.

[0003] Ferrous aluminum spinel is very rare in nature and can only be synthesized artificially. For example, "a method of synthesizing iron-aluminum spinel" (CN200710053793.3) adopts Al 2 O 3 , Al(OH) 3 , Al 2 O 3 ·H 2 O and bauxite, etc. and Fe 2 O 3 , FeO and Fe 3 O 4 and other iron-contain...