Aluminium-magnesia carbon brick and preparation method thereof

Abstract

The invention provides an aluminium-magnesia carbon brick and a preparation method thereof, belonging to the field of refractory materials. The raw materials of the aluminium-magnesia carbon brick include 30-80 parts of waste aluminium-magnesia carbon brick grains, 3-40 parts of special grade bauxite chamotte, 3-10 parts of magnesia, 3-10 parts of magnesia-alumina spinel, 5-8 parts of graphite, 3-15 parts of micro powder additives and 2.2-3.5 parts of organic bonds by weight. The preparation method is characterized by sorting, hydrating, drying and grinding the waste aluminium-magnesia carbonbricks from the steel mills and then mulling the waste aluminium-magnesia carbon brick grains with other raw materials, forming and carrying out heat treatment to prepare the aluminium-magnesia carbon brick. The energy-saving and environment-friendly aluminium-magnesia carbon brick prepared by the invention has high compression strength, low porosity, good resistance to molten steel corrosion andservice life reaching or exceeding the service lives of the traditional aluminium-magnesia carbon bricks. In the invention, the waste aluminium-magnesia carbon bricks are rationally utilized and consumption of the mineral resources is reduced.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to an aluminum-magnesia-carbon brick and a preparation method thereof. Background technique [0002] Traditional alumina-magnesia-carbon bricks are mainly used in ladle walls and bottoms, and the raw materials required for production are super-grade high-alumina bauxite clinker, magnesia, graphite, binders, antioxidants, and no more than 10% of the waste generated during production. Qualified product. The consumption of super high bauxite clinker is particularly huge, and the super high bauxite clinker industry is an industry with high energy consumption. A large number of waste refractory materials produced by iron and steel enterprises, except for a very small number that can be returned to the production line for reuse, most of the waste refractory materials are typically disposed of by burying, paving or downgrading. In this way, not only enterprises need to buy...

AI Technical Summary

Problems solved by technology

In this way, not only enterprises need to buy land to accumulate or bury these increasing waste materials, which increases production costs, but also causes a great waste of available resources and serious pollution of the environment

When producing traditional alumina-magnesia-carbon bricks, if waste alumina-magnesia-carbon bricks from steel mills are introduced into the formula, it is easy to cause cracking of the product, and the addition of more than 10% will lead to a decrease in the compressive strength of the product and an increase in porosity