Сomplex processing tailings of the Balkhash concentrating factory

Viktor Mikhaylovich Shevko, Gulnara Ergeshovna Karataeva, Galimzhan Mendikaraevich Serzhanov, Alexandra Dmitrievna Badikova, Assiya Salidinovna Abzhanova

South Kazakhstan State University named after M.Auezov Kazakhstan,160012, Shymkent, Tauke Khan avenue, 5

DOI : http://dx.doi.org/10.13005/bbra/1918

ABSTRACT: At flotation concentration of copper ores the tailings are formed, which contain both nonferrous metals and a significant amount of silicon and iron. The nonferrous metals from the tailings can be taken by flotation or leaching; but the silicon and iron is used irrationally as a backfilling material in mined-out space. The work purpose was the development of a complex technology of processing the Balkhash concentrating factory’s tailings (Kazakhstan) with production of a collective polymetallic concentrate and ferroalloys. The research has been fulfilled by a method of thermodynamic modelling using the software package НSC-5.1 (Outokumpy), a method of rototable experiment planning with regard to the chloride sublimation roasting of the Balkhash concentrating factory’s (BCF) tailings (0.27-0.39 % of Cu; 0,54-2.03 % of Zn; 0.13-0.5 % of Pb; 12.35-22.73 % of Fe; 7.04-13.09 % of СаО; 0.3-1.48 % of MgО; 6.2-11.71 % of Al₂O₃; 0.02-0.011 % of Мо; 0.04-0.07 % of As; 38.49-57.99 % of SiO₂; 0.41-0.58 % of Na; 0.61-0.74 % of K; 0.8-1.3 % of S) and electrosmelting cinders after the roasting. It is found, that copper is extracted from the flotation tails by chloride sublimation worse, than zinc and lead. For limitation of iron chloridosublimation it is necessary to carry out the process at 7-fold oxygen excess and 3-fold CaCl₂ one. High degree of nonferrous metals’ chloridosublimation (80-89 % of Cu, 95-99 % of Zn, > 99 % of Pb) and low degree of iron chloridosublimation (1-1.23 % of Fe) is observed at 1140-1200⁰С during 39-60 min and the surplus of CaCl₂ in 3,2 times. Electrosmelting the cinders of the chloride sublimation roasting of the Balkhash concentrating factory’s (BCF) flotation tailings in a mix with coke and quartzite allows to produce a ferroalloy with silicon content of 28-63 % (at extraction in the ferroalloy of 80-87.3 % of silicon). Ferrosilicon of a grade of FS50 is formed at the electrosmelting a charge containing 11 % of steel cuttings, 20 % of quartzite from the ore mass and 126-133 % of coke from a theoretically required quantity for the silicon and iron reduction. Ferrosilicon of a grade of FS45 is produced at electrosmelting the cinders in the presence of 20 % of quartzite, 6-11 % of steel cuttings and 100-106 % of coke

KEYWORDS: concentration tailings; chloridosublimationа; cinder; electrosmelting; ferroalloy

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