Abstract
This work presents the laboratory testing results of kinetics the oxidation process and sample processing of the sulphide polymetallic concentrate Blagojev Kamen. The aim of investigation is recovery of these types of raw material, present in large quantities in the peripheral parts of already used primary mineral deposits of copper, because of their high economic potential due to the content of a large number of metals and especially precious metals. Characterization of this raw material is based on the chemical analyses, XRD results, DTA analysis, etc. For these investigations, the sulphide concentrate with the following content was used in %: Cu – 2.3; Fe – 19.8; S – 27.19; Zn – 9.13; As – 0.167; Pb – 15.63; SiO2 – 17.93; CaO – 0.97; Al2O3 – 1.43; Ag – 480 g/t; Au – 659 g/t. Kinetic investigations of oxidation processes were carried out under the isothermal conditions within the temperature range of 400 to 625 oC. The Sharp's model was used for determination the kinetics parameters, and determined values of activation energy are 67 kJ/mole for the first period, and 47 kJ/mole for the second period. Pyrometallurgical treatment of this type of polymetallic concentrate, in the laboratory conditions, was carried out using the oxidative roasting and, then the reduction smelting was done in the Taman's furnace. Gold from 90.5 to 97.95% and silver from 77.28 to 93.37% are moved into the raw lead (smelting product). Gold from 1.1 to 3.92% and silver from 4.35 to 8.42% are moved into the polymetallic copper matte. Gold from 0.58 to 1.6% and silver from 2.45 to 6.82% are moved into the slag.
Highlights
The aim of investigation is the recovery of these types of raw material, present in large quantities in the peripheral parts of already used primary mineral deposits of Metall
Based on the results of laboratory investigation and literature data, the following technological layout (Figure 8) was defined for treatment the sulphide polymetallic concentrate from Blagojev Kamen: oxidation roasting, charge preparation, smelting, cupellation of raw lead to dóre metal and refining of dóre metal
Investigations the new copperbearing raw materials, which are located on the marginal parts of the main exploited mineral deposit of copper ore, are significant because of the upcoming modernization of the Copper Smelter in RTB Bor
Summary
In decision making on selection the collecting phase in certain situation, besides the above mentioned, the other facts have to be taken into consideration as well as : chemical content of concentrate, what in some cases could have a decisive influence, consumption of normative material, training of labour force and others This polymetallic goldbearing concentrate Blagojev Kamen, with content in (%): Cu – 2.3; Fe – 19.8; S – 27.19; Zn – 9.13; As – 0.167; Pb – 15.63; SiO2 – 17.93; CaO – 0.97; Al2O3 – 11.43; Ag – 480 g/t; Au – 659 g/t was undergone to the pyrometallurgical treatment (oxidation roasting – reduction smelting in a graphite tigel in the laboratory Taman's furnace). The produced sulphuric acid was reacted with measured standard solution of sodium hydroxide in the presence of indicator for the purpose of calculation the sulphur content and, degree of desulphurization during oxidation roasting was calculated with % of expected error as ± 0.1%
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