Desiliconization of Leucoxene Concentrate with Vacuum Silicothermal Reduction
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Vol. 61, No. 2, July, 2020
RAW MATERIALS DESILICONIZATION OF LEUCOXENE CONCENTRATE WITH VACUUM SILICOTHERMAL REDUCTION E. I. Istomina,1,2 P. V. Istomin,1 A. V. Nadutkin,1 and V. E. Grass1 Translated from Novye Ogneupory, No. 3, pp. 5 – 9, March, 2020.
Original article submitted October 30, 2019. A new approach is presented for processing leucoxene concentrate through vacuum silicothermal reduction of titanium and silicon oxides using commercial-grade silicon as a reducing agent. It is shown that reactions occurring during a high-temperature process are accompanied by formation of SiO gas resulting in desiliconization of leucoxene concentrate. The best desiliconization degree of 82% is achieved when the content of silicon in the reaction mixture is 29 wt.%. Keywords: leucoxene concentrate, vacuum silicothermal reduction, SiO gas, desiliconization degree.
carbothermal reduction treatment of leucoxene concentrate using activated charcoal as a reducing agent that provided a high degree of separation of silica and titanium components [17, 18]. The effect of removing silica is achieved due to formation in the course of high temperature oxidation-reduction reaction of SiO, which left the reaction area and could subsequently be readily condensed in the form of loose deposit in the reactor cooling area. A marked disadvantage of this method was formation alongside SiO gas of a significant amount of other gaseous products, and in fact O and CO2. This critically gave rise to a reduction in process productivity in view of a requirement for maintaining a relatively deep vacuum in the reaction vessel (10 – 100 Pa) by continuous intense pumping of uncondensed gases, formed in the course of carbothermal reduction. An alternative approach to silica removal from leucoxene concentrate may be vacuum silicothermal reduction using elementary silicon as a reducing agent. It is apparent that replacement of carbon reducing agent by silicon makes it possible to exclude formation of CO and CO2 gases in the course of reduction treatment. As a consequence there is a limitation of process productivity connected with a requirement for intense gas pumping in order to maintain a sufficiently good vacuum within the reaction vessel. In this case conditions are also maintained required for forming SiO gas, which may potentially provide a high degree of silicon removal from reduction treatment products. In the present article results are provided for studies by silicothermal reduction
INTRODUCTION The Yareg oil and titanium (leucoxene) deposit of the Komi Republic contains 60% of titanium raw material reserves that comprise according to some estimates more than half of all the explored titanium reserves in Russia. Titanium extraction from leucoxene ore in view of features of the leucoxene mineral structure whose construction is formed thin intergrowths of titanium minerals and quartz [2] is quite a complex production task. Recently various chemical and physicochemical approaches have been developed and studied for processing Yareg leucoxene concent
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