Open AccessLeaching of FeO and CaO by nitric acid from ash-slag wastes of thermal power plants
Author(s) -
Aleksey Khlopytskyi,
AUTHOR_ID,
Анатолій Сергійович Савенков,
Olga Bliznjuk,
Маргарита Скіба,
Victoria Vorobyova,
N. Yu. Masalitina
Publication year - 2022
Publication title -
voprosy himii i himičeskoj tehnologii/voprosy himii i himičeskoj tehnologii
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.278
H-Index - 7
eISSN - 2413-7987
pISSN - 0321-4095
DOI - 10.32434/0321-4095-2022-140-1-95-99
Subject(s) - leaching (pedology) , calcium oxide , calcium , iron oxide , oxide , chemistry , metallurgy , slag (welding) , materials science , inorganic chemistry , environmental science , soil water , soil science
In this work, the leaching of iron(II) oxide and calcium oxide from the wastes of thermal power plants by concentrated nitric acid was investigated. A laboratory unit for the study of leaching processes was developed. It was found that the concentrations of iron(II) oxide and calcium oxide in the solution increase with increasing the temperature of the leaching process by nitric acid. The influence of the ratio of reagents on the leaching of iron(II) oxide and calcium oxide from ash and slag wastes was established. An increase in the leaching time in the range of 15–90 minutes positively affects the process of extraction of iron(II) oxide and calcium oxide from ash and slag wastes. The calculated degree of extraction of iron(II) oxide and calcium oxide from ash and slag wastes, as the main criterion for leaching processes, showed that an increase in leaching duration leads to a more complete transition of iron(II) and calcium into solutions. Based on the analysis of the obtained experimental data, the main technological parameters for the extraction of iron(II) oxide and calcium oxide from ash and slag wastes in nitric acid solution have been determined.