Year: 2025
Type: article
Abstract: This study investigates the effect of preliminary autoclave oxidation with molecular oxygen (Т = 423 K, РО₂ = 0.6 MPa, τ = 2 h) on lignosulfonates differing in chemical composition and molecular weight distribution. Oxidation resulted in a reduction of hydroxyl groups and an increase in carbonyl groups, along with marked changes in solution properties such as redox potential, pH, specific conductivity, and surface tension at the liquid–gas interface. The functional activity of the initial and oxidized lignosulfonates was compared in terms of their ability to remove elemental sulfur films from the sphalerite surface under high-temperature oxidative pressure leaching conditions. The findings show that oxidative treatment decreases the effectiveness of lignosulfonates by diminishing their surface activity.
Source: Izvestiya Non-Ferrous Metallurgy
Institution: Ural Federal University
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4415011027