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    Pyrometallurgical Recovery of Gold From Refractory Gold Ledge Ores
    Sultanbek Kozhakhmetov1; Sergey Kvyatkovskiy1; Ruslan Seisembayev1; Anastasiya Semenova1;
    1INSTITUTE OF METALLURGY AND ORE BENEFICATION, Almaty, Kazakhstan;
    PAPER: 84/Non-ferrous/Regular (Oral)
    SCHEDULED: 12:35/Tue./Pontal (50/2nd)



    ABSTRACT:
    The problem concerning effective processing of gold ledge ores extremely refractory to loosening has been considered. [1]. Among gold ledge ores in Central Kazakhstan, ores from the Sayak-4 gold-arsenic-cobalt deposit discovered in 1950s have not been processed until the present as they are extremely refractory to loosening and beneficiation. [2, 3]. This papers is devoted to experimental study of the Reducing Pyrometallurgical Selection (RPS process) of refractory gold-arsenic-cobalt ledge ores from the Sayak-4 (Gold) deposit, under the conditions of concentrating gold in mattes and reduction melting with the recovery of precious metals into collecting iron-copper alloys [4]. Scaled-up tests were carried out using the Sayak-4 ores containing, %: Au - 3.5 g/t; Ag - 1.76 g/t; Fe - 3.95; Cu - 0.01; C - 1.93; S - 1.0; As - 3.3; Co - 0.05; SiO2 - 38.30; CaO - 23.6; Al2O3 - 4.56; MgO - 0.73. During experiments of gold collecting in mattes has shown the possibility to obtain slags containing Au - 0.1 g/t and Ag - 2.0-2.16 g/t. Reduction melting with additional charging of iron oxide, copper oxide and coke to the ore shows the possibility to obtain collecting iron-copper alloys containing Au - 7.5-8.14 g/t and Ag - 2.09-3.87 g/t. The obtained slags contained 0.38-0.50 g/t of Au and 0.2-3.2 g/t of Ag. Direct recovery of gold into collecting mattes reached 97%, and into metal alloy - 90.9%.

    References:
    [1] Zakharov V. A., Meretukov M. A. Gold: Refractory Ores. Moscow : "Ore and Metals" Publishing House (2013) 456. <br />[2] Naumov E. A., Kalinin Yu. A., Kovalev K. R., Borisenko A. S. Eastern Kazakhstan gold ore deposits in carbonaceous terrigenous-carbonate complexes and their isotropic-geochronological characteristics. Materials of International Symposium. "Huge gold deposits of Central Asia: Strengthening of Kazakhstan gold ore potential". Almaty, 13-14 March (2014) 123-126.<br />[3] Antonov Yu. A. Bakyrchik deposit and its reserve increase perspectives. Materials of International Symposium. "Huge gold deposits of Central Asia: Strengthening of Kazakhstan gold ore potential". Almaty (2014) 56-60.<br />[4] Kozhakhmetov S. M., Bekturganov N. S., Kvyatkovskiy S. A., Dzhumabaeva Z. Sh., Esetov U. E. Refractory gold ore pyrometallurgical selection technology development on Sayak-4 deposit's example with gold to matte recovery. Materials of International Symposium. "Huge gold deposits of Central Asia: Strengthening of Kazakhstan gold ore potential". Almaty, (2014) 182-184.