LIGNOFLOT

Organosolv lignin hydrophobic nanoparticles as low-carbonfootprint biodegradable flotation collectors.

Project team: Ulrika Rova (project leader), Paul Christakopoulos, July Ann Bazar, Katerina Hruzova, Leonidas Matsakas

Partners: Boliden Mineral; Sveaskog; Nouryon

Duration: 2019-2022

Funded by Vinnova’s Strategic Innovation Programme for Swedish mining and metal producing industry

Selective separation of desired minerals by flotation represents a pivotal step in the mining industry, particularly for Swedish mining companies engaged in the beneficiation of base metals and gold. Historically, flotation with xanthates has been the prevailing method, wherein these surface-active agents, also known as collectors, facilitate the adsorption of minerals at the water interface.

In response to environmental implications associated with the use of xanthates, LIGNOFLOT aims to establish a novel, sustainable flotation process for the extraction of base metals from sulfide ores. This involves replacing xanthate derivatives with biodegradable, non-toxic lignin nanoparticles, which are produced from forest residues. Beginning with the development of organosolv lignin particles and proceeding through their characterization to their application in the flotation process, the reagents will be tested under both laboratory and pilot-scale conditions.