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Mineral Processing and Extractive Metallurgy (Trans. Inst. Min. Metall. C) 2014 VOL 123 NO 1 - January 01 2014 Composition And Characteristics Of Slags From Continuous Converting Of Copper Matte And Concentrate
S.P. Pigarev1 ; Florian Kongoli 2 ; Ian McBow 2; L.B. Tsymbulov 1 ;
1Gipronickel Institute, OJSC "MMC "Norilsk Nickel"
2FLOGEN Technologies Inc,1255 Laird Blvd., Ste.388, Mont-Royal, Quebec, Canada

Keywords : Converting, Copper, Matte, Slag

ABSTRACT

The investigation results of the slags obtained in a newly developed process of continuous converting to blister copper of a mixture of nickel-containing copper matte and concentrates are presented. X-ray, SEM, EPMA and other methods were used to obtain the results. The slags are within the FeO-Fe2O3-SiO2-CaO-Al2O3-Cu2O-NiO system and are found to be prone to saturate trevorite (NiFe2O4)-based spinels whose content depends significantly on the consumption of fluxing components and on the changes of total concentration in the slag of (FezNi) and (SiO2zCaO). It is found that these slags are homogeneous in the range of SiO2/CaO ratios from 0?25 to 1?0 under the condition that (FezNi) total concentration in slag are 25-27%. It is shown that the dependence of the liquidus temperature on the SiO2/CaO ratio is characterised by a minimum at 1325oC with SiO2/CaO of 2. It is determined that the increase in the slag liquidus temperature reaches the maximum (1330oC) with copper content in matte of 60%. It is demonstrated that copper in these slags is mainly present in a soluble form and that copper dissolved in a silicate melt is present both in association with oxygen (oxide solubility) and outside this association (metallic solubility). Based on the obtained results, several guiding, practical industrial conclusions are drawn for a successful operation of a new continuous process.

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