Karaganda State Technical University (Ministry of Science and Education of the Republic of Kazakhstan), Karaganda, Republic of Kazakhstan:

P. N. Naguman, Assistant Professor, e-mail: kargtu@kstu.ru

Subsidiary of the National Center on Complex Processing of Mineral Raw Materials of the Republic of Kazakhstan “Zh. Abishev Chemical and Metallurgical Institute”, Kara ganda, Republic of Kazakhstan

Z. M. Tokaeva, Head of Laboratory
S. B. Nagumanova, Engineer
D. Kh. Bekova, Engineer

Non-ferrous metallurgy is one of industries in which there forms the largest amount of wastes. So, in pyro-metallic production of heavy non-ferrous metals, especially copper and lead, there form a lot of slags. Non-ferrous metals content in them often exceeds significantly their concentrations in the ores mined. For example, copper melting slags contain up to 0.1% of copper, 1 to 40% of zinc, 0.5 to 1.0% of lead, 15 to 40% of iron. If we take into account that copper ores with copper content up to 0.35 to 0.6% are subject to concentration, then metals concentration in copper production slags exceeds significantly specially mined ores. It is necessary to take into consideration the problems of ecological character and related nature-protective measures. A prospective method permitting to increase copper extraction from oxidized products is the method suggested, namely: electric treatment using a combined sulfur-graphite electrode. Therefore this work is devoted to studying the process of electrochemical-sulphidization of the copper oxidized forms with their following extraction into flotation concentrates. To do this there was used the method of mathematical planning an experiment. The simultaneous impact of all the factors (X₁, current density, A/m₂; X₂, acid consumption, g/dm³; X₃, repulping duration, min.; X4, electric treatment duration, min.; X₅, L:S ratio) with their certain values presents the possibility of obtaining a concrete and practically reproducible result. As a result of studies there were derived equations of private dependences with determining their relevance and generalized multifactor equations permitting to optimize and predict the process of copper extraction from slag using electrochemical treatment. There is presented a nomogram of copper extraction from slag treated by the electrochemical method with a combination of the factors providing copper extraction at the level more than 95.0%.

1. Shmonin Yu. B. Pirometallurgicheskoe obednenie shlakov tsvetnoy metallurgii (Pyrometallurgical impoverishment of the non-ferrous metallurgy slags). Moscow : Metallurgiya, 1981. 132 p.
2. Avetisyan Kh. K. O forme soedineniy medi v shlakakh (About the form of copper compounds in slags). Seriya trudov Mintsvetmet (Series of proceedings of the Ministry of Non-ferrous Metallurgy). Moscow : Tsvetmetizdat, 1932. 34 p.
3. Pererabotka otvalnykh i konverternykh shlakov tsvetnoy metallurgii (Processing of the dump and converter slags of non-ferrous metallurgy). Moscow : Tsvetmetinformatsiya, 1965. 250 p.
4. Barishpolets V. T. Opyt Ukrainskoy SSR po ispolzovaniyu vtorichnykh resursov (Experience of Ukrainian SSR on usage of secondary resources). Promyshlennost: obzornaya informatsiya : Seriya “Kompleksnoe ispolzovanie syrya, materialov, toplivno-energeticheskikh i vtorichnykh resursov” (Industry: review : Series “Complex usage of raw materials and supplies, fuel and energy resources, and secondary resources”). Kiev : Ukrainian Scientific and Research Institute of Scientific and Engineering Information, 1988. Iss. 4. 34 p.
5. Naguman P. N. Sposob izgotovleniya serografitovogo elektroda (Method of production of sulfur graphite electrode). Innovation patent of Republic of Kazakhstan, No. 21223. Published : May 15, 2009. Bulletin No. 5.
6. Malyshev V. P. Veroyatnostno-determinirovannoe planirovanie eksperimenta (Probabilistic and determined planning of experiment). Almaty : Nauka, 1981. 116 p.
7. Malyshev V. P. Vestnik Ministerstva Obrazovaniya i Nauki Respubliki Kazakhstan, Natsionalnoy akademii nauk Respubliki Kazakhstan – Bulletin of the Ministry of Science and Education of the Republic of Kazakhstan, National Academy of Sciences of the Republic of Kazakhstan. 2000. No. 4. pp. 22–30.