iron

Characterization and Interaction of Humic Acids with Metal Ions as a Function of Solution pH

This study examines the solubility of humic acids as a function of solution pH and their interactions with di- and trivalent metal ions at different pH values. It has been observed that humic acids and their salts interact with divalent transition metal ions in aqueous solutions at low pH values. The results demonstrate that the amount of metal ions – specifically copper, cobalt, and nickel – bound to humic acids increases almost linearly with their initial concentration. Moreover, the amount of bound metal ions rises as the pH of the medium increases.

APPARATUS-TECHNOLOGICAL SCHEME OF TIN CANS SCRAP RECYCLING WITH OBTAINING TECHNICAL PRODUCTS

The article is devoted to the study of reducing the technogenic load on the environment due to the integrated processing of household metal scrap. A waste-free, resource-saving, and environmentally safe method is proposed for extracting technical products from tin cans scrap - iron (III) oxide, tin (II) complex, suitable for further use, as well as fertilizer for agricultural crops. As a result of theoretical and experimental studies, the direction of cans scrap recycling was selected with an assessment of the parameters and factors affecting the reagent process of scrap disposal.

ADVANCED TECHNOLOGIES FOR PROCESSING LIQUID WASTE OF GALURGICAL PRODUCTIONS

The accumulation of highly mineralized waters and brines in the mining-industrial regions of Ukraine carry a threat of salt pollution of underground and surface water sources. Low-waste processing of these waters is prevented by iron compounds, hydrogen sulfide and sulfur-containing organic compounds. The process of accumulation of iron compounds in brines and groundwater in the presence of hydrogen sulfide has been studied. Comparative calculations of the thermodynamic potentials of the corresponding reactions have been carried out.