1. Product description of steelmaking
Steelmaking process with electricity as energy source. Electric furnace steelmaking with scrap as raw material, less investment in infrastructure than blast furnaces and converters.
2. Advantages of steelmaking
1. Less investment
2. Low production costs and high labour productivity
3. Environmentally friendly and efficient
3. Refractory materials for electric furnaces for steelmaking.
1. Ultra-high-power electric furnaces
Ultra-high power electric furnace to the refractory material is the first problem is the hot spot area is concentrated and large, water-cooled furnace wall need to use good thermal conductivity of magnesia carbon brick.
Ultra-high power electric furnace furnace bottom using dry magnesium pounding material or vibrating material. This aggregate is magnesium sand, the fine powder is magnesium sand containing iron oxide and calcium oxide.
Ultra-high power electric furnaces are mostly biased furnace bottom out of steel, the steel outlet filler is mainly composed of magnesia olivine or magnesia-calcium coarse sand particles.
The water-cooled triangle at the top of the furnace is built with fired high alumina bricks or poured corundum castables. Outside the triangle, fired high alumina bricks or unfired high alumina bricks or corundum prefabricated parts can be used. The furnace roof is generally not made of alkaline bricks.
2. Direct current arc furnace.
DC electric arc furnace is a graphite electrode as the positive electrode, the furnace bottom for the negative electrode, so the furnace bottom is required to be able to conduct electricity. Conductive refractory furnace bottom by the magnesium carbon bricks and magnesium carbon pounding material layer constitutes. Magnesia carbon brick and magnesia carbon pounding material in the carbon content of 12% to 18%, masonry furnace bottom to magnesia carbon brick vertical masonry for the best.
Steel rods and their surroundings are repaired with magnesium dry vibrating material. The repair of the bottom of the furnace to use conductive furnace material, generally magnesium carbon material is the main, but also with the formation of metal network structure of the furnace material such as magnesium sand and iron powder.