ORALS

SESSION: MetalsWedPM2-R3	Dmitriev International Symposium (6th Intl. Symp. on Sustainable Metals & Alloys Processing)
Wed. 30 Nov. 2022 / Room: Arcadia 1
Session Chairs: Bagdaulet Kenzhaliyev; Anil K. Kar; Session Monitor: TBA

16:20: [MetalsWedPM210] OS
POSSIBILITY OF SEPARATION OF CHROME FROM TITANIUM IN ILMENITE CONCENTRATE
Bagdaulet Kenzhaliyev¹ ; Omirserik Baigenzhenov² ; ¹Kazakh-British Technical University, Almaty, Kazakhstan; ²Satbayev University, Almaty, Kazakhstan;
Paper Id: 291 [Abstract]

ABSTRACT Processing of ilmenite concentrates into titanium-containing slag, titanium tetrachloride, and titanium sponge is complicated by the high content of chromium in it. Therefore, the methods based on preliminary carbon reduction of ilmenite concentrate at 900-1200 °С and following reduction of reduced iron and chrome by electromagnetic separation are widely used in industry. Then the non-magnetic titanium-chromium fraction is for hydrochemical treatment to purify it from chromium and other impurities. It has been determined that the selective solid-phase reduction of ilmenite chromiumcontaining concentrate should be performed at 1250 °С and 2 hours’ dwell period. It was found that the addition of 8% sodium chloride to the charge accelerates the reduction process for iron from ilmenite. At the same time, the recovery of reduced iron into the magnetic fraction is 76.1%, recovery of chromium is 55.8%, recovery of titanium is 15.3%. The titanium-chromium fraction was sintered with the calculated amount of soda at 850 °С for 2 hours to separate chromium from titanium compounds and leached with hot water (S:L = 1:4) at the temperature of 95-100 °С and stirring for 120 minutes. At the same time, the chromium recovery into the solution was 83.6%. Titanium-beneficiated concentrate contains 6.2% iron, 36.2% titanium and 0.42% chromium.

References:
Keywords: ilmenite concentrate, high chromium content, reductive roasting, magnetic separation,
soda, sodium chloride, leaching