Research of the Process of Production of Steel Square Continuous Billets for Rolling Balls of Large Diameter

Abstract

The paper investigates the technology of production of steel billets continuously cast billets for rolling balls of large diameter. In Kazakhstan, in connection with the development of new copper deposits such as Aktogay and Bozshakol, the need for large diameter steel grinding balls for primary ore processing has increased. The main problem in the operation of large diameter grinding balls is the tendency of the grinding media to break during operation. The authors of the work investigated the process of production of steel billets continuously cast billets with a cross section of 150 × 150 mm for rolling balls of large diameter (d 125 mm) in the PB LLP "KSP Steel", which showed that the breaking of grinding balls is initiated mainly by the presence of internal discontinuities (gas axial looseness) in continuously cast billets. Studies have shown that the technological scheme for the production of grinding balls with a diameter of 125 mm from continuously cast billets with a section of 150 × 150 mm, including steel smelting in an arc furnace with steel finishing on a ladle-furnace unit, deoxidation with aluminum and degassing in a ladle vacuum apparatus, casting steel in a closed jet on a continuous casting and further production of rolled stock on a rough rolling mill ensures the absence of internal discontinuities (gas bubbles, axial looseness) in the workpieces and ensures the production of high quality balls.

Research of iron extraction from primary steelmaking slag

“…In the Pavlodar region of the Republic of Kazakhstan, in the production of steel at the electric steelmaking enterprises of Casting LLP and KSP Steel LLP, the resulting electric steelmaking slags and dust are stored in slag heaps and are practically not used. They have a high content of iron oxides and metallic iron particles in them (up to 40% of the mass in certain types of slags) [8,9,10]. Innovative projects are already being implemented in Kazakhstan to involve secondary steelmaking slags and other metallurgical waste in the processing [11 -20].…”