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首页> 外文期刊>Metallurgical and Materials Transactions B >Removal of Tin and Copper from Liquid Iron by Al2O3-Saturated Ca-CaCl2 Slags at 1448 to 1648 K
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Removal of Tin and Copper from Liquid Iron by Al2O3-Saturated Ca-CaCl2 Slags at 1448 to 1648 K

机译：Al2 O3 -饱和Ca-CaCl2 渣在1448至1648 K时从液态铁中去除锡和铜

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The removal of tin and copper from liquid iron by Al2O3-saturated Ca-CaCl2 slags was carried out in separate alumina crucibles at 1448 to 1648 K that showed small partition ratios of less than 1. The tin content of the liquid iron typically decreased from its initial value of 50 to 40 wt pct and the (gross) copper content of the iron-copper mixture from 50 to 45 wt pct, at equilibrium. The small refining efficiencies (37 pct, maximum) of the slags, the initial composition of which were, in most cases, Ca-50 wt pct CaCl2, may be attributed to the significant dissolution in them of alumina, up to 42.0 wt pct (29.6 mol pct), in experiments with Sn, and up to 54.4 wt pct (38.6 mol pct), in experiments with Cu. Treating Ca as the solvent, a number of interaction coefficients such as $ varepsilon_{{{text{Al}}_{ 2} {text{O}}_{ 3} }}^{{{text{Al}}_{ 2} {text{O}}_{ 3} }} ,,varepsilon_{{{text{Al}}_{ 2} {text{O}}_{ 3} }}^{{{text{CaCl}}_{ 2} }} ,,varepsilon_{{{text{Al}}_{ 2} {text{O}}_{ 3} }}^{text{Sn}} ,,varepsilon_{{{text{CaCl}}_{ 2} }}^{{{text{CaCl}}_{ 2} }} ,,varepsilon_{{{text{CaCl}}_{ 2} }}^{text{Sn}} , $ and $ varepsilon_{text{Sn}}^{text{Sn}} $ as well as the activity coefficient $ gamma_{{{text{Al}}_{ 2} {text{O}}_{ 3} }}^{0} $ were all determined at 1448 K. The activity of Ca (relative to pure liquid Ca) was obtained as approximately 0.65 to 0.75 in the system. Further, the two partial molar mixing/excess properties of alumina $ bar{H}_{{{text{Al}}_{ 2} {text{O}}_{ 3} }}^{M} $ and $ bar{S}_{{{text{Al}}_{ 2} {text{O}}_{ 3} }}^{XS} $ in the alumina-saturated Ca-17 pct CaCl2- ~37 pct Al2O3 (molar basis) slag were evaluated and found to be ?118.3(±10.8) kJ/mol and ?0.062(±0.007) kJ/K·mol, respectively, at 1448 to 1648 K. In addition, in view of the reported success of CaC2 as a refining agent, some experiments were carried out with CaC2-CaF2 mixtures in alumina, magnesia, and graphite crucibles at 1873 K, to remove tin from liquid Fe-2 wt pct Sn. However, alumina and magnesia crucibles leaked owing to their dissolution in calcium fluoride; in graphite crucibles, only a small transfer of tin, 3 to 7 pct of its initial mass, to the slag phase took place.
机译：用Al2 O3 饱和的Ca-CaCl2 炉渣在1448至1648 K的分开的氧化铝坩埚中从液态铁中去除锡和铜，显示出小的分配比小于1.平衡状态下，液态铁的锡含量通常从其初始值50降至40 wt％，铁铜混合物的（总）铜含量从50降至45 wt％。炉渣的细化效率最高（最高37 pct），其初始成分在大多数情况下为Ca-50 wt pct CaCl2 ，这可能归因于氧化铝在其中的显着溶解。在使用Sn的实验中为42.0 wt％（29.6 mol pct），在使用Cu的实验中最高为54.4 wt％（38.6 mol pct）。将Ca视为溶剂，可以使用许多相互作用系数，例如$ varepsilon _ {{{text {Al}} _ {2} {text {O}} _ {3}}} ^ {{{text {Al}} _ { 2} {text {O}} _ {3}}} ,, varepsilon _ {{{text {Al}} _ {2} {text {O}} _ {3}}} ^ {{{text {CaCl}} _ {2}}} ,, varepsilon _ {{text {Al}} _ {2} {text {O}} _ {3}}} ^ {text {Sn}} ,, varepsilon _ {{{text {CaCl} } _ {2}}} ^ {{{text {CaCl}} _ {2}}} ,, varepsilon _ {{{text {CaCl}} _ {2}}} ^ {text {Sn}}，$和$ varepsilon_ {text {Sn}} ^ {text {Sn}} $以及活动系数$ gamma _ {{{text {Al}} _ {2} {text {O}} _ {3}}} ^ {0 } $都是在1448 K处确定的。在系统中，Ca（相对于纯液体Ca）的活性约为0.65至0.75。此外，氧化铝$ bar {H} _ {{{{text {Al}} _ {2} {text {O}} _ {3}}} ^ {M} $和$ bar的两个部分摩尔混合/过量特性在氧化铝饱和的Ca-17 pct CaCl2中的{S} _ {{{text {Al}} _ {2} {text {O}} _ {3}}} ^ {XS} $-〜37对pct Al2 O3 （基于摩尔）的炉渣进行评估，发现其在1448至1648年分别为？118.3（±10.8）kJ / K·mol和？0.062（±0.007）kJ / K·mol。 K.另外，鉴于已报道成功使用CaC2 作为精制剂，于1873年在氧化铝，氧化镁和石墨坩埚中对CaC2 -CaF2 混合物进行了一些实验。 K，以从液态Fe-2 wt pct Sn中除去锡。但是，氧化铝和氧化镁坩埚由于溶解在氟化钙中而泄漏。在石墨坩埚中，只有少量锡（初始质量的3至7 pct）转移到炉渣阶段。

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