Magnesia carbon brick and preparation method thereof

Abstract

The invention provides a magnesia carbon brick and a preparation method thereof, belonging to the field of refractory materials. The raw materials of the magnesia carbon brick include 30-80 parts of waste magnesia carbon brick grains, 3-40 parts of magnesia grains, 6-12 parts of graphite, 5-15 parts of magnesia powder, 3-15 parts of micro powder additives, 2.2-3.5 parts of organic bonds by weight. The preparation method is characterized by sorting, hydrating, drying and grinding the waste magnesia carbon bricks from the steel mills and then mulling the waste magnesia carbon brick grains with other raw materials, forming and carrying out heat treatment to prepare the 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 and service 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 a magnesia-carbon brick and a preparation method thereof. Background technique [0002] Traditional magnesia-carbon bricks are mainly used in the ladle slag line and the lining of electric furnaces and converters. The raw materials required for production are magnesia, graphite, binders, antioxidants and no more than 10% of unqualified products produced during production. The consumption of magnesia is particularly huge, and the magnesia 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 land to accumulate or bury these increasing waste materials, wh...

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 magnesia-carbon bricks, if waste 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