Анотація
The mechanism of accumulation of dissolved iron compounds in groundwater and brines under the influence of sulfate reduction and the resulting decrease in the redox potential is considered. The mechanism under consideration has been experimentally confirmed. A method of extraction of sulfides and ferrum-containing compounds by electrochemical oxidation using an inert anode is proposed. The technology for obtaining an inert anode based on manganese and lead oxides, stable in most natural waters and brines, which does not contain noble metals and their compounds, is described. The specified technology involves the deposition of manganese dioxide on a titanium base by thermal decomposition of manganese nitrate. After that, the base is covered with a thin layer of PbO2 by electrodeposition from an alkaline complex electrolyte, and then with a thick layer of the same oxide by electrodeposition from a nitrate electrolyte. It has been established that the contact of an alkaline complex electrolyte with the active surface of metallic lead can significantly reduce the formation of bottom deposits during electrodeposition. It is shown how interruption of the current during the electrodeposition of such an anode can reduce its porosity and increase its stability. The process of iron removal and sulfide extraction from highly mineralized mine and quarry waters has been studied. It has been theoretically calculated and experimentally confirmed that the electricity consumption for the iron removal process of such waters does not exceed 1 kW*h/m3. An example of the application of the method of electrochemical iron removal and sulfide extraction from highly mineralized brines with their subsequent resource-saving processing and obtaining water for power supply of energy facilities and commodity mineral salts is given.
Посилання
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