AP19679572 "Development of a new technology for the utilization of zinc dust from steelmaking industries with the production of marketable products"
Relevance
Due to the lack of a rational technology for processing zinc dust with a high lead content, they are not used on an industrial scale and accumulate in large volumes. The developed technology will stimulate the development of Pb, Zn and steel production by involving ferrous metallurgy in the processing of lead-containing zinc dust to produce commodity products with high added value. The development of lead-containing zinc dust processing facilities will have a positive impact on expanding the range of marketable products in their traditional production and increase their export potential.
Purpose
Investigation of the physico-chemical bases of zinc extraction from clinker by sintering it with calcium chloride. Technological experiments on the extraction of zinc from clinker. To achieve this goal, the following tasks have been solved: Studies of the forms of metals in clinker have been conducted. The method of processing clinker to produce commercial zinc dust was selected and justified; a thermodynamic analysis of the solid-phase interaction of clinker components with calcium chloride was carried out.; Laboratory experiments were conducted to study the effect of temperature, reducing agent consumption, and process duration on the distribution of zinc and related metals between clinker sintering products with calcium chloride; the results were evaluated. A general technological scheme has been developed for processing zinc dust to produce commercial products.
Expected and achieved results
Results: new data on the forms of metals in clinker have been obtained. New scientific approaches to processing zinc-containing clinker have been substantiated; new data on the behavior of zinc and related metals under conditions of solid-phase sintering of clinker with calcium chloride have been obtained; new data on the distribution of metals between the products of the process have been obtained; a technological scheme for extracting lead and zinc from ferrous and non-ferrous metallurgy dust has been developed. Novelty: A high zinc content of up to 50% has been established in clinker. Zinc in clinker is found in the form of oxide, with a minimum amount of zinc chloride (~1%). Lead is completely represented as an oxide. Iron in clinker is 90% in the form of wustite and in a small amount of ~ 0.2% in the form of chloride (FeCl3). New data on the behavior of zinc, lead, and related metals under conditions of solid-phase sintering of clinker with CaCl2 have been obtained. The possibility of selective extraction of zinc into sublimations in the form of its chloride by the stadial mechanism of reduction of zinc oxide with calcium chloride has been established. New data have been obtained on the extraction and distribution of zinc and lead between the products of high-temperature sintering of clinker together with CaCl2. The optimal parameters of high-temperature sintering of clinker together with calcium chloride have been established: t =900 ° C, t =60 minutes, the consumption of CaCl2 is 1.3 times higher than its consumption from SNC. The recovery of zinc in distillations was 98.9%.
Research team members with their identifiers (Scopus Author ID, Researcher ID, ORCID, if available) and links to relevant profiles
Scientific supervisor-Koishina Gulzada Mynyshkyzy
List of publications with links to them
- Dosmukhamedov N. K. et al. Enlarged laboratory experiments of ferrous metallurgy dust sintering with calcium chloride //Kompleksnoe Ispolzovanie Mineralnogo Syra= Complex use of mineral resources. – 2025. – Т. 335. – №. 4. – С. 59-66.
- Koishina G. M. et al. Извлечение цинка из пыли от электродуговых печей путем высокотемпературного хлорирующего спекания //Engineering Journal of Satbayev University. – 2024. – Т. 146. – №. 4. – С. 8-15.