钛矿护炉机理

tsgt001
tsgt001
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发布时间:2015-08-19 14:33
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含钛原料在高炉内的反应过程,如何形成防护层来降低炉缸侧壁温度高的

信息编号:583   查看次数:2412  2015-08-19 14:33 发布人:tsgt001 一级 试用期  IP:222.134.216.50  
其它回答(5)
[Ti]与高炉炉缸
1、 TiO2还原的热力学条件
        SiO2的还原是从高炉软熔带以下开始,经过滴下带到炉缸完成的。比较SiO2与的分解反应自由能变化
                                                 △G°SiO2  =216500 – 42.0T                                                   ①
                                                 △G°TiO2  =225500 – 42.8T                                                   ②
        可以看出两个分解反应的熵几乎相等,只是TiO2分解所需的热要大一些,故TiO2较之SiO2更难还原。
        根据钛氧化物还原的各级反应自由能计算,还原性气体(CO、H2)不能承担钛氧化物还原的任务。因此,钛氧化物的还原过程主要是在高温条件下有固体碳来实现的
                                               TiO2+ 3C=== TiC+ 2CO          △G°  =120460 – 80.52T           ③
                                               TiO2+ 2C+1/2N2=== TiN+ 2CO   △G°  =84160 – 60.95T         ④
        两者反应的温度都在1100℃以上,当温度超过1581℃时,TiC的还原势能大。
        综合以上,不难发现滴下带存在着TiO2还原的较为完备的热力学和动力学条件,接近风口燃烧温度的高温,炽热的焦炭粒提供了强还原性气氛,加之冶炼炼钢生铁过程中铁水的碳量在滴下过程中迅速增加,[C]达4%以上,也为钛氧化物的还原提供了还原剂,为还原产物的扩散提供了良好的条件。
高炉高度上的TiC、 TiN变化
高炉部位 TiC  % TiN  %
炉腹         1.03   0.56
风口平面 1.23         0.80

2、 [Ti]与炉缸工作
        不管TiC、 TiN的生成部位在何处,其最终都将随炉渣与铁液聚集到炉缸,对炉缸的工作产生影响。由于铁水中的钛大多是以TiC、 TiN的形式存在,它们的熔点分别是3150℃和2950℃,在铁水中以固体颗粒形式悬浮于铁液中,增加铁液粘稠度,降低铁水流动性,起到护炉作用。
       [Ti]不仅半身起到使铁水粘稠的作用,还促进碳的石墨化,造成铁水粘稠更甚。[S]则相反,在高炉中起着阻止碳的石墨化的作用。
3、 风口喂钛精粉
        当高炉炉缸局部出现水温差升高、耐火材料测点热电偶温度上升超过操作规程规定的要求时,我们必须高度重视。
3.1 加强水温差测量,增加测量频次;
3.2 对水温差高度部位冷却壁进行热流强度检测,热流强度大于30000kJ/(h•m2)就要高度重视,适当控制冶炼强度、增加该区域冷却壁的冷却强度(常压水该高压水)、热流强度大于40000kJ/(h•m2)高炉休风缩小该区域上方风口进风面积或堵风口操作;同时可以采用钛矿冶炼或钛精粉喂线护炉。经验是:当铁水中[Ti]大于0.150%以上时,铁水粘稠度增加,铁水中[Ti]大于0.200%以上时,可以起到保护炉缸的作用;当热流强度大于50000 kJ/(h•m2)时,高炉要密切关注该区域的变化,防止出现炉缸局部烧穿的事故发生。

                                                                                                   2015年8月20日

回复时间:2015-08-20 09:57 回答者:马铁人 马铁人 一级 试用期

钛能阻止碳的石墨化

回复时间:2015-12-07 15:45 回答者:钱多多 钱多多 一级 试用期

难熔,沉积于炉底

回复时间:2016-03-15 10:52 回答者:山丘 山丘 一级 试用期

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