Empress Catherine II Saint Petersburg Mining University, St Petersburg, Russia

Maksimova R. I., Post-Graduate Student, maksimova_RI@pers.spmi.ru
Sizyakov V. M., Doctor of Engineering Sciences, Scientific Director of the Scientific Center “Problems of Processing of Mineral and Man-Made Resources”, sizyakov_VM@pers.spmi.ru
Brichkin V. N., Doctor of Engineering Sciences, Head of Department “Fundamentals of Scientific Competence”, brichkin_VN@pers.spmi.ru
Kurtenkov R. V., Candidate of Engineering Sciences, Associate Professor, kurtenkov_RV@pers.spmi.ru

The potential for using alkali aluminosilicates in alumina production and by-products is well known, thanks to the testing of various processing approaches, the leading position of the Russian scientific community in this area, and the experience of industrializing developed process solutions and schemes. Despite the prominent place of alkali aluminosilicates raw materials in the domestic production sector and the significant contribution of research teams to improving their processing performance, significant uncertainty remains in addressing greenhouse gas emissions and the accumulation of industrial waste resulting from the use of natural limestone as a key component in the process. In this regard, the development of scientific and technological approaches and technical solutions for recycling the lime component during the processing of alkali aluminosilicates determined the purpose of the study and the theoretical and experimental objectives associated with its implementation. Furthermore, the possibility of reducing the specific yield of calcium silicate sludge and carbon dioxide emissions during the processing of alkali aluminosilicates was  demonstrated, depending on the quantity and quality of the aluminum-containing additive, which reduces the silicate modulus of the raw material mixture in the batch for alumina production by sintering. The possibility of reusing the regenerated lime component in the production of alumina and Portland cement, depending on its proportional distribution, with an equivalent replacement of natural limestone in the composition of raw mixtures and batches that satisfy the basic indicators of their quality in terms of the alkaline and lime modulus, has been theoretically substantiated and experimentally confirmed.

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