Abstract
When producing iron ore concentrate at Kachkanarsk integrated mining works 2 types of wastes are formed, namely: final tailings of dry magnetic separation (DMS) and final tailings of wet magnetic separation (WMS). Final tailings of wet magnetic separation (WMS) are pulled off or dumped into disposal area up to 45mln tons annually causing great damages to the environment. These final tailings are finely dispersed materials, their chemical composition is oxides of silicon, aluminium, calcium and iron in general. All this allows to use the wastes under consideration to produce Portland cement clinker replacing clayey and iron components in the raw material mixture completely and limestone partially. The replacement of clay with final tailings of ore enrichment are suitable to manufacture clinker raw material mixture allowing to use two-component raw mix instead of three-component and four-component one thus simplifying the technology of cement production and improving the ecological situation in Sverdlovsk region. The utilization of final tailings for concentration of titano-magnetite ores decreases fuel consumption when burning clinker compared to the traditional compositions. Experimental cement meets all the requirements of the Russian Standard 10178 as to their chemical and physic-mechanical properties and have grade 500.
Highlights
Mining industry all over the world is developing approximately 1.5 times quicker than other branches of industry using mineral raw materials
Results of experiments and discussion The chemical composition of wet magnetic separation (WMS) final tailings from Kachkanarsk IMW is characterized by stability of the same order kind as foe the raw materials used in cement industry
Kachkanar final tailings are characterized by high content of CaO, MgO, TiO2 and SiO2 and differ from the closest to their content final ore tailings of Sokolovo-Sarbysky deposit.It is found that the raw mixtures produced by using final tailings of Kachkanarsk IMW and limestones from Neviansky deposit are characterized by higher silicate modulus, but Pashinsky raw mixtures are characterized by higher silicate modulus (n) too and lower value of Al2O3 modulus (p)
Summary
Mining industry all over the world is developing approximately 1.5 times quicker than other branches of industry using mineral raw materials. In this case the Russian Federation is not an exception which results in an invariable increase of both mining volumes and raw material enrichment.the quantity of technological wastes is increasing, including slimes, final tailings and slags which are to be stored in disposal area.The availability of such dumps including proper activity of integrated mining works and mining benefication works (IMW) causes definite damage to environment, namely: air pollution, ground waters and land tenure.
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