High-temperature simulation of slag foaming induced by various gas sources
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摘要: 熔渣泡沫化的有效控制对冶金工艺的稳定控制具有重要的现实意义。开展了外引和内生两种气源条件下熔渣泡沫化的高温模拟研究，得到如下结论：在外引气源条件下，泡沫渣由尺寸为7～15 mm的多面体气泡堆积而成，泡沫化高度随气体流量增加先升高后降低；在内生气源条件下，泡沫渣由尺寸为0.5～1.0 mm的球形气泡堆积而成，泡沫化高度随气体产生量的增加和熔渣碱度的降低而升高。典型炼钢辅料的消泡效果对比如下：活性石灰>纯碱>石灰石>白云石>菱镁矿。Abstract: The effective control of slag foaming has an important practical significance for stability of metallurgical process. In this paper high-temperature simulation of slag foaming induced by interior and exterior gas sources had been conducted. Under present experimental conditions, the following conclusions are obtained. Induced by exterior gas source, the foamed slag consisted of polyhedral bubbles with a size of 7～15 mm. The foaming height firstly increased and afterwards decreased with increasing gas flowrate. When induced by interior gas source, the foamed slag was stacked with spherical bubbles with a size of 0.5～1.0 mm; the foaming height increased with increasing gas amount released by slag-metal reaction and decreasing slag basicity. The defoaming agent were classified depending on their effects: active lime > soda ash > limestone > dolomite > magnesite.
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Key words:
- slag , foaming /
- foam structure /
- foaming height /
- exterior gas source /
- interior gas source /
- defoaming agent /
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图 1 试验装置示意
1–钼丝；2–吹气管；3–可移动挡板；4–气体转子流量计；5–刚玉管；6–炉管；7–发热体；8–石墨坩埚；9–氧化镁坩埚；10–样品台；11–热电偶；12–进气口；13–冷却水进口
Figure 1. Schematic diagram of experimental apparatus
图 2 泡沫渣形貌俯视（氩气流量50 mL/min）
Figure 2. Top view of foamed slag (Ar flow rate of 50 mL/min)
图 4 内生气源条件下泡沫渣中的气泡形貌
(a)、(b)球形气泡；(c)椭球形气泡；(d)不规则气泡
Figure 4. Bubble morphology in foamed slag induced by external gas source
图 5 不同生铁加入量条件下泡沫化高度随时间的变化情况
Figure 5. Variation of the foaming height against time with various amounts of pig iron
图 6 不同熔渣碱度条件下泡沫化高度随时间的变化情况
Figure 6. Variation of the foaming height against time under various slag basicity
图 8 典型炼钢辅料的消泡效果对比
Figure 8. Comparison of defoaming effects of typical steel-making auxiliary materials
表 1 试验渣化学成分设计
Table 1. Chemical compositions of experimental slag
序号 碱度R w/% CaO SiO2 TFe MgO 试验渣 A 0.5 24.00 48.00 20.00 8.00 试验渣 B 0.75 30.86 41.14 20.00 8.00 试验渣 C 1.0 31.72 31.72 20.00 8.00 试验渣 D 1.25 40.00 32.00 20.00 8.00 
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表 2 生铁的化学成分
Table 2. Chemical compositions of pig iron
% Fe C Si Mn P S 94.80 4.60 0.36 0.12 0.08 0.04
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