DOI: 10.18503/1995-2732-2022-20-4-37-46
Abstract
Problem Statement (Relevance). Graphite is a non-polar, non-metallic mineral that plays an important role in many technological processes in various industries. An alternative source of flake graphite is kish graphite from metallurgical production. Flotation is used to separate graphite-containing raw materials in order to isolate flake graphite. A main area of improving the flotation process is aimed at intensifying surface properties of graphite flakes in the separation process and adjusting flotation modes using more efficient reagents. A subject of the study is kish graphite from a blast furnace shop of an iron and steel works. Objective of the research is to study the possibilities of increasing the flotation concentration of kish graphite by determining physical and chemical regularities of the flotation using a centrifugal impact mill for grinding and complex reagents based on dimethyl ethynyl carbinol, an active substance. Originality lies in the study of the regularities of the flotation using preliminary mechanical activation and new reagents, previously not used for the flotation of graphite, the most difficult type of flake graphite for the concentration, namely blast furnace kish graphite. The authors have studied the influence of the method and duration of kish graphite disinte-gration, the content of solid particles in the slurry and the type of the complex reagent on the flotation parameters. Re-sult. Dry grinding and mechanical activation in a centrifugal impact mill provides a selective disintegration and increas-es the reactivity of graphite particles. This leads to an increase in the mass fraction of carbon in the combined concen-trate by 19.77% and a decrease in the content of the magnetic fraction by 22.15%. Flotation reagents DK-80 and MIKS show different flotation activity in respect of coarse and fine products of an air classification. During the flotation of coarse products, the reagents show a greater selectivity to graphite, while during the flotation of fine products, the selectivity to graphite is lower, but the concentrate is cleaner in terms of the mass fraction of magnetic particles and the carbon extraction is higher. The results obtained will be used to develop the kish graphite flotation technology in column flotation machines, which are characterized by increased flotation selectivity due to secondary concentration processes in the froth layer.
Keywords
iron kish, kish graphite, flotation, complex reagents, dimethyl ethynyl carbinol, foaming, centrifugal impact grinding, dynamic classification
For citation
Fadeeva N.V., Orekhova N.N., Kolodezhnaya E.V., Nigmatova N.N. Study on the Physical and Chemical Regu-larities of the Kish Graphite Flotation Process. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Univer-siteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2022, vol. 20, no. 4, pp. 37-46. https://doi.org/10.18503/1995-2732-2022-20-4-37-46
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