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摘要国内以前常使用工业纯铝进行终脱氧，其会产生大量Al2O3夹杂。Al2O3熔点较高，在钢水中是固态的细小颗粒，弥散分布在钢水中，很难分离出来，易在连铸水口结瘤，堵塞管道，导致生产中断，降低钢材的成材率。要解决铝脱氧的产生的Al2O3夹杂问题，目前比较热门的是钙处理，使用Al-Ca合金脱氧，Ca是一种脱氧能力比铝还好的元素。但是其密度比钢水低，投入钢水中会漂浮在钢水上层，脱氧效果并不理想，要想其充分发挥作用就要增大密度，为了不造成二次污染我们想到了加入了一定量的铁粉和Al-Fe合金，制成了Al-Ca-Fe合金。研究表明，1560℃用50.2%Al-Fe、7.5%铁粉和42.3%Al-Ca熔炼得到的Al-Ca-Fe是比较完整的一块，几乎不粉化，所以使用控制变量法在不改变其他条件的基础上只增高和降低了温度分别进行实验，分析1520℃、1560℃和1600℃熔炼前后的Al-Ca-Fe合金中钙的含量，获得不同温度下熔炼时钙的收得率，研究温度对钙的收得率的影响。结果表明：熔炼温度越高，Ca的收得率越低，最佳的熔炼温度为1520℃。49175
毕业论文关键词： 钙收得率；炼钢用终脱氧剂；Al-Ca-Fe脱氧剂
Abstract
Domestic aluminum industry were often used before the final deoxygenation, which will produce a large Al2O3 inclusions. Al2O3 high melting point in the molten steel is solid fine particles, dispersed in the molten steel, it is difficult to separate easily in continuous casting nozzle clogging, clogging pipes, leading to production interruptions and reduce the rate of finished steel. To solve the problem of Al2O3 inclusions produced deoxy aluminum, currently the more popular is calcium treatment using Al-Ca alloy deoxidation, Ca is a better oxygen capacity than aluminum elements. But its low density than molten steel, molten steel into molten steel will float on top, deoxidation effect is not ideal, in order to give full play to its role will increase the density, in order not to cause secondary pollution we thought of adding a certain amount of iron and Al-Fe alloy, made of Al-Ca-Fe alloy. Studies have shown that, 1560 ℃ with 50.2% Al-Fe, 7.5% iron and 42.3% Al-Ca obtained by melting Al-Ca-Fe is a more complete one, almost no powder, so use the control variable does not change the law in other basic conditions on only increasing and decreasing the temperature were experiments, analyzed 1520 ℃, the content of Al-Ca-Fe alloy 1560 ℃ and 1600 ℃ melting before and after calcium obtained at different temperatures melting calcium yield research temperature effect on the yield of calcium. The results show that: the higher the melting temperature, the lower the yield of Ca, the best melting temperature of 1520 ℃.
KeyWords：Ca yield rate；Finishing agent for steelmaking；Al-Ca-Fe deoxidizer
目录
1.1 脱氧剂的作用 1
1.2 单一脱氧剂 1
1.3 复合脱氧剂 1
1.4 夹杂物对钢的影响 2
1.5 铝基脱氧剂 3
1.6 钙处理对钢的作用 4
1.7 铝钙合金的研究 5
1.8 Fe-Al-Ca脱氧剂的研究 8
2 研究的目的和意义 9
3 课题基本内容 11
3.1 实验内容 11
3.2 实验原料 11
3.3 实验设备 12
3.4 实验步骤 13