KINETICS OF HIGH-TEMPERATURE DEHYDRATION OF LISAKOVSK IRON ORE CONCENTRATE

 Lisakovsk deposit of brown iron ore (Kostanay region, Kazakhstan) is developed by the open method, which provides cheaper  ore mining. At the LF LLP “Orken”, the ore is enriched in a gravitymagnetic process to produce a gravitational-magnetic concentrate containing 48 to 49 % of Fe, 10 to 12 % of SiO2 , 4.5 to 5.5 % of Al2O3  and 0.7–0.9 % of P. The product is supplied to the agglomeration in  JSC  “Arcelor Mittal Temirtau” (Temirtau, Kazakhstan). Because of  the increased content of phosphorus in the gravitational-magnetic concentrate, the demand for it is limited. Lysakovsk concentrate contains  a significant amount of hydrated moisture (up to 12 %). Most of the  moisture is in the form of iron hydrates and decomposes at a moderate  temperature of 320–350 °C. The other part, apparently, is associated  with a phosphorus-containing component decomposing at elevated  temperature. In this process, oxidative firing results in the formation  of free phosphorus oxide. Studies on decompounding a hydrated phosphorous-containing component in Lisakovsk iron ore concentrate were  undertaken to determine kinetics of the process. Removal of phosphorus from the iron ore concentrate during preparation for metallurgical  processing is possible after high-temperature oxidizing roasting of the  material and subsequent sulphuric acid leaching. Phosphorus is not  leached from the original concentrate by hydrometallurgical method.  Using high temperature, it is necessary to break the chemical bond  and transfer phosphorous to a free oxide. Complete decompounding  of the hydrated phosphorous-containing component at roasting affects the quality of subsequent sulphuric acid treatment of the roasted  product. High-temperature hydrate moisture is exuded from Lisakovsk  concentrate step-by-step. The rate of high-temperature dehydration de creases with the rise of calcination temperature, which is explained by  slow water vapour diffusion through the layer of material that becomes  packed at the temperature rise.

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