Secondary use of steelmaking process gas, dust and sludge
Guide: We know that there will be a series of by-products in the steelmaking process. In addition to solid slag, waste gas is also a common by-product of the steel industry.
Where do the dust and sludge come from?
The dust removal equipment is also called a filter. It can collect the dust and sludge in the steelmaking process. It is the dust or fine powder shape produced in different steelmaking processes, and the water content is high. The main component of
the dust produced after gas purification is iron, which is mostly reused in steel mills. Iron oxide cannot be recycled internally, but can be sold to other industries for a variety of applications such as Portland cement or motor cores.
Secondary use of process gas
The gas from the coke oven, blast furnace or oxygen top-blown converter can be recycled to produce steam and power for the steel plant to reduce the power generation needs of the steel plant. These gases can be fully reused at the steel production site,
providing 60% of the electricity demand of the steel plant. In addition, excess process gas can be sold, and these gases are rarely simply burned.
Multipurpose use of process by-products
The zinc oxide process that may be produced by the electric arc furnace process can be sold as a raw material. In the converter steelmaking process, ammonium sulfate obtained by purifying coke oven gas can be used as chemical fertilizer, BTX can be used
as benzene, toluene, xylene, tar and naphthalene for the production of plastic products for the production of asphalt, and also for the aluminum, plastics and coatings industries. Electrode material is provided. These are valuable raw materials for other industries.
In order to further improve the recovery rate of by-products, expand the application of by-products, replace the stone mining with by-products for cement production, and use by-products on highway subgrades or railway tracks, thereby saving natural
resources and reducing environmental impact.