Synthesized collectors flotation activity study based on fluorine containing and acetylene alcohols
Authors:   Irkutsk National Research Technical University, BURDONOV Aleksander , VCHISLO Nadezhda ,   A. E. Favorsky Irkutsk Institute of Chemistry SB RAS, BARAKHTENKO Vyacheslav ,   Irkutsk National Research Technical University, SAHABUTDINOVA Tatiana ,   Irkutsk National Research Technical University
Published: December 2023

Introduction. The article describes the problem of low quality mineral raw materials used for gold mining and considers the possibilities of increasing the efficiency of the technological process of beneficiation of refractory ores. As a result of the study, studies were carried out to study the flotation activity of new collecting reagents and their effect on the surface of sulfide gold-bearing minerals was studied. Research methods and materials. The methods used in the work were NMR, atomic absorption and ultraviolet spectroscopy, electron microscopy, laser diffraction, ore preparation, flotation, and electrophoretic light scattering. To determine the assessment of flotation activity as heteropolar collectors for the flotation of sulfide minerals, a number of synthesized compounds were used: 2-methyl-3-butyn-2-ol, 5-dimethyl-4-methylidene-1,3-oxathiolane-2-thione and 2. 2,3,3,4,4,5,5-octafluoropentyl sodium xanthate. Sulfide ore was used to conduct laboratory flotation studies; the monomineral pyrite was used to study the sorption of the reagent and determine the zeta potential of the surface. The following reagents were also used in the experiment: activator – copper sulfate; heteropolar collectors – potassium butylxanthate (BCX), sodium dialkyldithiophosphate (BTF-1552); organic carbon depressor – beta-sulfonaphthalene formaldehyde sodium salt (oroflos D); blowing agent – methyl isobutyl carbinol (MIBC). Research results and discussion. The synthesis of collecting reagents based on various chemical reactions was carried out and their flotation activity was studied. Several promising compounds have been obtained that have shown results when used as heteropolar collectors for the flotation of sulfide minerals. The research results showed that one of the synthesized reagents, 2-methyl-3-butyn-2-ol, has a positive effect on gold recovery during flotation. This reagent increases recovery by 0.18% and 1.46% when used together with other reagents. It also increases recovery by 1.81% when used alone. This suggests that 2-methyl-3-butyn-2-ol can be used as a replacement for one of the main heteropolar collectors. Determination of UV spectra showed the sorption of 2-methyl-3-butyn-2-ol on the surface of pyrite with an amount of up to 2.388·10-5 mol/m2 depending on the initial concentration of the reagent. The results of determining the zeta potential showed that the reagents significantly reduce this indicator, indicating electrostatic interaction and adsorption of the reagents on the pyrite surface. Conclusion. Overall, this paper describes the development of new harvesting reagents and their effects on the surface of sulfide gold-bearing minerals. The results of the study suggest the possibility of using 2-methyl-3-butyn-2-ol as a replacement for one of the main collectors in flotation. Resume. The article presents the results of studies assessing the flotation activity of a number of synthesized compounds: 2-methyl-3-butyn-2-ol, 5-dimethyl-4-methylidene-1,3-oxathiolan-2-thione and 2,2,3,3 ,4,4,5,5-octafluoropentyl sodium xanthate. The best technological performance during laboratory flotation was found for the reagent 2-methyl-3-butyn-2-ol; the extraction of gold into the concentrate was 84.68%, the content was 10.2%. For this compound, its amount adsorbed on the surface of pyrite was determined to be up to 2.388·10-5 mol/m2 in experiments. A low negative charge on the surface of pyrite was revealed after mixing it with reagent solutions when determining the zeta potential. Suggestions for practical applications and directions for future research. The results of the work can be recommended for further pilot tests with the subsequent development of technology for the industrial production of these reagents in the case of improved technological indicators of flotation gold extraction.