Soda recovery furnace brasque material based on aluminum-rich magnesium aluminate spinel and preparation method thereof

Abstract

The invention relates to a soda recovery furnace brasque material based on aluminum-rich magnesium aluminate spinel and a preparation method thereof. The preparation method comprises the following steps of: firstly, mixing 50-80wt% of aluminum-rich magnesium aluminate spinel aggregate with 20-50wt% of aluminum-rich magnesium aluminate spinel fine powder to obtain a mixture, adding a binding agent accounting for 4-15wt% of the mixture, stirring, constructing, curing and roasting the mixture to prepare a soda recovery furnace brasque material based on aluminum-rich magnesium aluminate spinel. The main physical properties of the chrome-free and alkali-resistant refractory material based on aluminum-rich magnesium aluminate spinel prepared by the preparation method provided by the invention are as follows: the volume density is 2.60-2.85 g/cm3, the compression strength is 30-45 MPa, and the linear changing rate is 0.19-0.47%. The preparation method provided by the invention has the advantages of simple technique and low energy consumption, and the prepared soda recovery furnace brasque material based on aluminum-rich magnesium aluminate spinel is free of chromium and is excellent in alkali corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of lining materials for alkali recovery furnaces, and in particular relates to a lining material for alkali recovery furnaces based on aluminum-rich magnesium aluminum spinel and a preparation method thereof. Background technique [0002] Alkali recovery furnaces in paper mills have long used chromium refractory materials as furnace lining materials. During use, part of the chromium in bricks will be converted from Cr 3+ into highly toxic and carcinogenic Cr 6+ , thus destroying the environment and threatening human health. With the continuous enhancement of people's awareness of environmental protection, it is imperative to develop refractory materials for chromium-free and alkali-resistant recovery furnaces. [0003] In recent years, a lot of work has been done at home and abroad to find alternative materials for magnesia-chrome bricks. The alternative materials are mainly dolomite refractories and magne...

AI Technical Summary

Problems solved by technology

But magnesium aluminum spinel (MgAl 2 o 4 ) has a high melting point (2135°C), when preparing periclase-magnesia-alumina spinel bricks or magnesia-alumina spinel bricks, it needs to be fired at 1000°C to 2000°C, which consumes a lot of energy and has a complicated process