The electric arc furnace refractory lining is used for the reduction and smelting of metal oxide ore, so it is also called the submerged arc reduction electric furnace.

When the electric arc furnace refractory lining is used to produce ferroalloy, it is called ferroalloy furnace: when it is used to produce calcium carbide, it is called calcium carbide furnace: when it is used to produce yellow phosphorus, it is called yellow phosphorus furnace: when it is used to produce matte, it is called matte furnace: it is used for ferroalloy refining It is called submerged thermal refining furnace: when it is used to melt the pre-reduced charge and separate the metal from the slag, it is called a melting furnace.

For the electric arc furnace refractory lining, the refractory masonry is the furnace lining. Because the molten pool of the electric arc furnace refractory lining not only withstands strong high temperature action, but also is eroded and mechanically scoured by the charge, high temperature furnace gas, molten iron and high temperature slag, specific refractory materials must be selected.

Requirements for refractory materials: high refractoriness, large changes in shape and volume at high temperature, high temperature strength, good slag resistance, good chemical stability at high temperature, various refractory materials should keep their appearance clean and complete in structure , the corner corrugation has no defects, and the surface has no cracks

In the masonry of the electric arc furnace refractory lining, the refractory materials for the electric arc furnace refractory lining are mainly made of refractory bricks, and the refractory castables are the auxiliary masonry configuration. The choice of material is as follows:

1. Carbon brick

Carbon brick is a kind of carbon material. It is made with crushed coke and anthracite. Its specifications are: section 400mm×400mm (allowable error is ±30mm), length is 800~1600mm (allowable error is ±5mm);

The advantages of carbon bricks are high refractoriness, strong thermal shock resistance, high compressive strength; good stability, especially volume stability, and good slag resistance. However, it is easy to be oxidized at high temperature, and the oxidation speed will increase with the increase of temperature.

Therefore, the carbon material cannot come into contact with gases such as air and water vapor at high temperatures. Carbon materials have high thermal conductivity and poor thermal insulation performance. In the electric arc furnace refractory lining, carbon bricks can be used as the lining material for all varieties that are not afraid of carburizing in smelting, and self-baking carbon bricks are used in the electric arc furnace refractory lining.

2. Composite brown corundum brick for electric arc furnace refractory lining

The main component of composite brown corundum brick is AI2O3, its refractoriness is above 1790℃, its apparent porosity is extremely low, its strength is high, its corrosion resistance and scourability are strong, etc. It is suitable for the lining of synthetic ammonia reformer.

3. Clay bricks

Clay bricks are weakly acidic refractory materials that can resist the erosion of acid slag, and refractory clay bricks cannot be used at high temperatures.

In summary, the selection of refractory materials for electric arc furnace refractory linings should be professionally configured according to the actual smelting environment and smelting raw materials. The melting pool of electric arc furnace refractory lining can also use high-alumina bricks instead of clay bricks. In terms of performance, high-alumina bricks have more advantages. Among the unshaped refractories, cold ramming pastes and high-alumina castables are the main ones.