在中性气氛及1473K的温度下,通过测定试样的失重及其组成,研究了SnS从SnO—FeO—SiO_2和SnO—FeO—CaO-SiO_2两种炉渣(混以FeS)中挥发的速率。研究表明,在硫化烟化过程中,SnO的挥发与SnS相比可以忽略不计,在炉渣中增加CaO可以加快SnS的挥发速率,挥发的微分速率方程可以表示为: -d(％Sn)/dt=k(％Sn)(％S)其中表观速率常数k分别为4.20×10~(-3)(SnO-FeO-CaO-SiO_2)和2.88×10~(-3)(SnO-FeO-SiO_2)
Under inert atmospheres and 1473K, the evaporation rate of SnS fromSnO--FeO0-SiO_2 and SnO--FeO--CaO--SiO_2 slags mixed with FeS was investigated by meas-uring the weight loss and composition of samples. The experimental results show that during sulfide fuming process the evaporation of SnO from Slags is negligible in comparison with that of SnS. Addition of CaO to slags can enhance the evaporation rate of SnS. The differential rate equation of evaporation may be expressed as:-d(%Sn) / dt = k(%Sn)(%S)where, the apparent rate constant k was found to be 4.20×10~(-3) for SnO--FeO--CaO--SiO_2 sys-tem and 2.88×10~(-3) for SnO--FeO--SiO_2 system, respectively.
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