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首页> 外文会议>The Belton Memorial Symposium Proceedings, Jan 10-11, 2000, Sydney, Australia >Equilibrium slag losses in ferrovanadium production
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Equilibrium slag losses in ferrovanadium production

机译：钒铁生产中的平衡渣损失

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摘要

Ferrovanadium is sometimes produced from V_2O_3 in electric arc furnaces, using aluminium as reductant. CaO fluxes the alumina which forms during reduction of the vanadium oxide. Incomplete reduction of vanadium oxide from the slag is a significant cause of vanadium losses. To quantify factors which can affect the equilibrium vanadium loss, the vanadium oxide activity coefficient was measured experimentally for different slag compositions. Hydrogen-water mixtures were used to control the partial oxygen pressure (ca. 10~(-13) atm) over CaO-Al_2O_3 slags contained in vanadium crucibles at 1700℃; gas phase mass transfer was controlled by jetting the gas mixture onto the slag surface. Manipulation of the redox conditions at a single slag composition and temperature showed that - as expected - the vanadium is present in the trivalent state in the slag. The slag basicity (CaO/Al_2O_3 ratio) was found to have a very strong effect on the activity coefficient of VO_(1.5), with clear implications for the effect of plant practice on vanadium loss.
机译：钒铁有时是在电弧炉中使用铝作为还原剂由V_2O_3制成的。 CaO使在氧化钒还原过程中形成的氧化铝助熔剂。炉渣中氧化钒的还原不完全是钒损失的重要原因。为了量化可能影响平衡钒损失的因素，对不同炉渣成分通过实验测量了氧化钒活度系数。用氢气-水混合物控制钒坩埚中CaO-Al_2O_3渣在1700℃下的氧分压（约10〜（-13）atm）；通过将气体混合物喷射到炉渣表面上来控制气相传质。在单一炉渣成分和温度下对氧化还原条件的操作表明-正如预期的那样-钒以三价态存在于炉渣中。发现炉渣碱度（CaO / Al_2O_3比）对VO_（1.5）的活度系数有非常强的影响，对工厂实践对钒损失的影响有明显的影响。

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