Authors:
Guram Nemsadze | PJSC «CUVCIF “General Investment Resources «GIR» | Ukraine
Kyrylo Sharandin | GIR-ENGINEERING LLC | Ukraine
Оleksiy Smirnov | Physical-Technological Institute of Metals and Alloys, National Academy of Sciences of Ukraine | Ukraine
Revaz Dzhodzua | PJSC «CUVCIF “General Investment Resources «GIR» | Ukraine
Dmytro Riabyi | GIR-ENGINEERING LLC | Ukraine
Dr. Maksym Goryuk | Physical-Technological Institute of Metals and Alloys, National Academy of Sciences of Ukraine | Ukraine
One of the most important strategies for the development of converter steel-making technology is to achieve high resistance of the working lining, which is associated with the minimum unit costs of refractories and allows eliminating the downtime due to repairs. The choice of the optimal lining care system during operation is based, ultimately, on the reasons of reducing unit costs and process requirements. Modern technologies allow "hot" repairs of the converter lining without its decommissioning during the operation period.
Slag coating on the lining surface exercised by means of nitrogen jets that splash specially treated slag with magnesium additives, has become an efficient technology to extend the lifetime of the converters’ refractory lining. Meanwhile, converter steelmaking practice demonstrates that the chemical composition of the final slag can fluctuate within a reasonably wide range of FeO, SiO2, CaO, etc. concentration values. This complicates application of universal magnesium-based flux additions and set particular constrains for their efficiency.
Based on the obtained results, flux-modifier for final converter slag was developed and tested in the industrial environment, the flux-modifier being of magnesia-based, produced from available domestic materials comprising both low-soluble and readily-soluble components. With regard to the above mentioned, 2-6 mm fractions made up min. 80% of the total volume of low-soluble components.
The most promising alternative to the hot or semi-dry shotcrete of local wear, which requires no special equipment and personnel training, is the hot repairing using self-flowing, magnesium masses.