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INVESTIGATIONS OF WASTE SLUDGE OF TITANIUM PRODUCTION AND ITS LEACHING BY NITRIC ACID
Abstract
To date, titanium and magnesium production is based on chlorine technology, which, for all its merits, is characterized by a high level of formation of industrial products and waste. In particular, ?Ust-Kamenogorsk Titanium and Magnesium Plant? JSC annually produces 30?35 thousand tons of solid chloride wastes, which contain 700?1400 tons of titanium oxide. Part of titanium chloride waste is leached with water and neutralized with calcium hydroxide to pH 7-8.5. The resulting pulp pumps are pumped into sludge collectors and accumulates in them. The reserves of sludge or sludge are about 320 thousand tons, the multicomponent composition of which is present in the form of oxides, oxychlorides and carbonates. Currently, the ?Institute of Metallurgy and Ore Benefication? JSC is developing a complex technology for processing titanium production sludge with the extraction of valuable products. The growing need for rare metals and their compounds, as well as the depletion of raw materials sources require the recycling of raw materials. Extraction of titanium from waste is an urgent task. At the first stage of the developed technology was the study of the physicochemical properties of the sludge and its leaching with nitric acid. According to the results of X-ray phase and electron probe analysis, it was found that the main phases of the sludge are calcite 31.33%, waterite 13.88%, quartz 12.37%; titanium is present in the phases of rutile 4.45%, lower titanium oxide 6.05%, titanic acid 6.9%; calcium is also present in hydrocalumite phases, 5.38%, portlandite, 4.97%, aluminum akermanite, 3.51%; elemental sulfur is also present in the sample, 7.18%. The optimal leaching parameters of titanium production slimes with nitric acid were determined: the concentration of nitric acid is 20%, the temperature is 20 °C, the duration of the experiment is 30 minutes, pH1, T: W = 1: 8. Under these optimal conditions, extraction of titanium into the solution is 5.04%, and calcium, 84.7%, filtration rate is 0.035 m3/m2?h.
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