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首页> 外文期刊>Scandinavian Journal of Metallurgy >Liquidus temperatures and viscosities of FeO-Fe_2O_3-SiO_2-CaO-MgO slags at compositions relevant to nickel matte smelting
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Liquidus temperatures and viscosities of FeO-Fe_2O_3-SiO_2-CaO-MgO slags at compositions relevant to nickel matte smelting

机译：FeO-Fe_2O_3-SiO_2-CaO-MgO渣的液相线温度和粘度与无光镍冶炼有关

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摘要

Although the liquidus temperatures and viscosities of iron silicate slags are critical in the operation of many pyrometallurgical processes, there is relatively little published data relating to complex, multi-component systems. In this study, liquidus temperatures and viscosities in the FeO-Fe_2O_3-SiO_2-CaO-MgO slag system were determined at conditions relevant to base metal smelting processes. The classical quench technique was used to measure liquidus temperatures at Fe/SiO_2 ratios of 1.3 to 1.8, CaO contents up to 9 wt percent, MgO contents up to 12 wt percent and at oxygen partial pressures of 10~(-11) and 10~(-8) atm. The addition of MgO was found to lead to large increases in liquidus temperature. The addition of CaO generally led to a moderate fall in liquidus temperature but the magnitude and direction of the change depended on the Fe/SiO_2 ratio and MgO content. At CaO contents greater than about 3 percent, in creasing the oxygen partial pressure of the system raised the liquidus temperature moderately and lowered the ability of CaO to depress the liquidus temperature. The viscosity of the slags was measured over similar composition ranges at iron saturation by means of a coaxial, cylindrical cup and bob arrangement. The slags were found to be Newtonian in behaviour above their liquidus temperatures. Viscosity decreased significantly as the Fe/SiO_2 ratio was increased in the range 1.3 to 2.00. The addition of low levels of CaO or MgO lowered the viscosity but the addition of further MgO increased the viscosity. The MgO content at which the viscosity began to increase decreased with increased CaO content.
机译：尽管硅酸铁渣的液相线温度和粘度在许多火法冶金工艺的操作中至关重要，但有关复杂的多组分系统的公开数据相对较少。在这项研究中，FeO-Fe_2O_3-SiO_2-CaO-MgO炉渣系统中的液相线温度和粘度是在与贱金属冶炼过程相关的条件下确定的。在Fe / SiO_2比为1.3至1.8，CaO含量最高为9 wt％，MgO含量最高为12 wt％，氧分压为10〜（-11）和10〜 （-8）atm。发现添加MgO会导致液相线温度大幅升高。 CaO的添加通常导致液相线温度适度下降，但变化的幅度和方向取决于Fe / SiO_2比和MgO含量。当CaO含量大于约3％时，系统氧分压的增加会适度提高液相线温度，并降低CaO降低液相线温度的能力。在铁饱和时，通过同轴的圆柱形杯和鲍勃布置，在相似的组成范围内测量了炉渣的粘度。发现炉渣在高于其液相线温度的情况下具有牛顿性。随着Fe / SiO 2比在1.3至2.00范围内增加，粘度显着降低。添加少量的CaO或MgO会降低粘度，但是添加更多的MgO则会增加粘度。粘度开始增加的MgO含量随CaO含量的增加而降低。

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