Investigation of the Production of Anhydrite from Technogeneous Gypsum and the Possibility of its Use in the Production of Filling Mixture (Backfill Blend) for the Conditions of the Talnakh Mines

The results of studies on the development of a technology for the production of calcium sulfate anhydrite by roasting technogenic gypsum obtained from the neutralization of sulfuric acid during the disposal of sulfur-containing gases from the pyro-metallurgical processing of ores and concentrates of PJSC MMC Norilsk Nickel are presented. The granulometric, phase, and chemical compositions of technogenic gypsum and roasting products of technogenic secondary raw materials were studied in the temperature range from 600 to 1200^оC. The moisture-absorbing capacity of gypsum and roasting products was analyzed. The possibilities of using the obtained anhydrite instead of natural raw materials in the technology of backfilling the mined-out area of the mine are shown. The results of tests of filling mixtures with the use of artificial anhydrite are presented.

Ya.I. KOSOV¹, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
D.V. RUMYANTSEV¹, head of laboratory of pyrometallurgy;
М.S. POPOV¹, Engineer;
А.V. TROFIMOV¹, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
А.I. DEVOCHKIN², Deputy Director for Scientific and Technical Development;
V.М. TOZIK², former chief engineer;
А.V. KELEXSAEV³, Candidate of Sciences (Engineering)

¹ “Gipronickel Institute” LLC (11, Grazhdansky Avenue, St. Petersburg, 195220, Russian Federation)
² “MMC “Norilsk Nickel” Polar Branch PJSC (15, 1st Krasnogvardeisky passage, Moscow, 123100, Russian Federation)
³ “MMC “Norilsk Nickel” Technical expert examination center PJSC (15, 1st Krasnogvardeisky passage, Moscow, 123100, Russian Federation)

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