EURO-ECO 2009 Hanover 3 - 4 Dezember 2009	Environmental, Engineering - Economic and Legal Aspects for Sustainable Living
	European Academy of Natural Sciences, Hanover European Scientific Society, Hanover University of Bremen, Bremen

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Abstracts EURO-ECO 2009

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N.L. Medyanik

Acid mine waters of mining works of a copper-pyrites complex in Ural region can be referred by the volume of sevage and content hard and nonferrous metals in them to the category of liquid man-made resources, their processing will be allowed to get valuable and expensive metals in condition of commodity output on the one hand and on the other hand to bring down ecological load in the region.

Manganese can be refereed to such metals as well, due to the fact that its content in acid mine waters of south Ural ore mining and processing enterprises is close to its content in the traditional hydromineral raw stuff, that is said about opportunity to use given waters as a supplementary source for receiving of different Mn(II) compounds, which is used widely in metallurgical and other industrial branches.

The conducted analysis of existing methods of Mn(II) extraction from the man-made sewages has shown that taking into account features of chemical composition in mine waters of copper-pyrites deposits it is more technological effectively and economic expediently to convert Mn²⁺ ions to the dispersion phase by oxidation of it with «active chlorine» up to the insoluble forms of Mn³⁺ and Mn⁴⁺. For conversion of Mn²⁺ ions into the dispersed phase it is more optimum to use the process of electrochemical precipitation (in conditions of un diaphragmental electrolysiser).

For extraction from solutions of making up Mn dispersed phase it is more perspective to use the electroflotation method. In comparison with other methods advantages of this one are linked with physical and chemical peculiarities of making up sediments (with fragility, ability to the redispersion in the time of intensive intermixing, necessity of flotation caring out by the low speed of gas flow and so on) with a little size of making up electrolytic bubbles and with their availability of surface electrostatic charge.

The made in work investigations have shown that selective extraction of Mn(II) in condition of dispersed phase from acid mine waters defining with high content of cations is imposed copper and iron extraction.

It is more advisably to use the method of cementation for Cu²⁺ ions extraction. This method lets effectively and selectively extract copper from acid mine waters of mining and processing enterprises, in addition to this without changing concentration of Mn²⁺ ions in the water systems, with a new to essential difference in values of standard electrode potentials of given metals (φ⁰_Mn = − 1,18B, ⁰_Cu = + 0,34B). Further, after cooper extraction from acid sewages it is important to extract iron selectively. It is expediently for this to use the method of acid basic precipitation which is allowed by driving to pH system up to 4 practically completely to fall out iron in form of hydro-oxide Fe(OH)₃ (iron extraction by given value is 96%) and then to make process of Mn(II) extraction in a combined way (oxidized precipitation – electroflotation) in compass of pH 4,5 – 7,0.

The made tests of brought forward technological outline (cementation – acid basic precipitation – oxidized precipitation – electroflotation) on real acid under dumped waters of the South Ural ore mining and processing enterprises let draw following collusions:

− the brought forward scheme of line of line of communication extraction of copper iron and manganese ions is simple enough, effective and doesn’t demand any complicated apparated design;

− the worked out scheme of acid mine waters processing is allowed not only to extract valuables components in form of commodity outputs not also to reduce consent ration of ions hard and nonferrous metals in sewage;

− the given technology can be used for organization of closed cycle of water supply at a ore mining enterprise.