共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
3.
4.
5.
6.
7.
9.
10.
含磷量高的钢材可塑性和韧性水平都较低,因此为了降低磷含量,避免低温环境下钢材冷脆断裂的风险,提升优质钢材产量,就必须要从炼钢工艺上进行优化.基于脱磷热力学的基本原理,分析了在大型转炉平台上探索稳定创新优质脱磷工艺,实现了生产低磷洁净钢材的工艺路径. 相似文献
11.
通过采用热力学软件 Factsage 6.4、SEM、EDS、XRD,并结合红外和拉曼实验手段分析研究了一次倒渣和终点炉渣物相结构.结果表明:一倒渣和终渣的黏度均随着温度的升高而降低.温度相同时,一倒渣的黏度较高,但熔点低于终渣.低温时形成的液相较多,更有利于脱磷反应的进行.炉渣 Si、Ca、P 元素富集的区域,形成的矿相主要为2CaO?SiO2-3CaO?P2 O5固溶体相,对脱磷较为有利;而 Fe、Mn、Mg 和 O 元素富集的区域,形成的物相主要为铁氧化物和RO相,炉渣脱磷能力脱磷较差.红外和拉曼分析结果表明:一倒渣和终渣都形成SiO4四面体单元,一倒渣主要以Si-O-Si键为主,而终渣主要以P-O-P键为主.硅酸盐网状结构单元结构越多,对脱磷越有利. 相似文献
12.
13.
14.
15.
对碳热还原转炉渣进行热力学分析,分别在二硅化钼高温电阻炉和500 kg顶底复吹多功能试验炉开展转炉渣碳热还原脱磷的实验室试验。结果表明,反应温度及动力学条件对脱磷率有较大影响,在电阻炉试验条件下,保证反应温度为1 500 ℃、碳当量为3.0、保温时间为30 min的情况下,可以获得30%左右的脱磷率。在顶底复吹多功能试验炉内,焦粉既作为还原剂也作为升温剂,焦粉与氧气反应放热可以保证脱磷反应在较高温度下进行,同时顶吹氧气对熔渣层的良好搅拌有利于脱磷反应速度进一步提高,试验过程脱磷率为84%,其中还原进入钢液的脱磷率为75.85%,气化脱磷率为8.15%。焦粉带入的硫有10.8%进入钢水,有6.25%进入炉渣。 相似文献
16.
针对高磷鲕状赤铁矿石矿物结构复杂导致的脱磷困难现状,为实现深度脱磷的目的,探索矿物还原过程中磷的形态及微观脱磷过程。以铁品位为44.78%、磷的质量分数为0.92%的高磷鲕状赤铁矿为研究对象,根据其面扫描电镜及矿相结构图可知,矿物之间嵌布紧密、逐层形成鲕状结构,石英、鲕绿泥石与赤铁矿等互相包裹,磷元素集中分布在鲕粒内部的氟磷灰石中。通过对焙烧产物做扫描电镜(SEM)及能谱分析(EDS),对高磷鲕状赤铁矿脱磷机理进行研究。研究结果表明,当YM-1脱磷剂质量分数为16%,还原过程中鲕状结构被破坏,金属铁逐渐从鲕粒中析出聚集,脉石与铁颗粒分离明显,磷化为不同形态被脱除。磁选后尾矿、铁分离完全,磷元素几乎全部进入尾矿,添加复合脱磷剂YM-1焙烧磁选后铁精矿的铁品位为90.16%,铁回收率为91.25%,磷质量分数为0.056%,脱磷率为93.91%。铁精粉各项指标满足工业冶炼要求。 相似文献
17.
18.
通过热力学分析和实验结果表明氧气转炉前期高碳脱磷的可能性.采用CaO渣系能满足铁碳合金的高碳脱磷.在1723K,采用CaO渣系,以上钢一厂高炉铁水为例,讨论了脱磷反应的理论限度,指出在碳含量[C]=0.5%,Po2=1.29×10-11Pa的条件下,[P]=0.02%.实验数倨表明,平均碳含量[C]=3.33%~2.40%,磷含量从0.136%降至0.005%,符合氧气转炉钢前期高碳脱磷要求. 相似文献
19.
WU Wei MENG Hua-dong LIU Liu YUAN Tian-xiang BAI Yan-jiang YAN Zhan-hui 《钢铁研究学报(英文版)》2012,19(7):20-25
The slag melting characteristic of slag forming and slag splashing for 300 t BOF less slag process is researched by combining the methods of the slag chemical composition, the melting point determination and the petrographic analysis. The results show that the melting point of final slag for less slag smelting is 20 ℃ lower than that for conventional smelting. According to results of the petrographic analysis, the C3S (3CaO·SiO2) and C2S (2CaO·SiO2) content for less slag smelting are lower than those for conventional smelting, while the RO (FeO, MgO, MnO, etc) phase and C4AF (4CaO·Al2O3·Fe2O3) phase are higher than those for conventional smelting. According to results of the chemical analysis, the (CaO) content and slag basicity for less slag smelting are higher than those for conventional smelting, while (FeO) and (MgO) content in slag for less slag smelting are almost equal to those for conventional smelting. The reason why slag melting point for less slag smelting is lower than that for conventional smelting is that the quantity of added fluorite for less slag smelting is more than that for conventional smelting. According to the analysis results the slag melting point is determined by the C3S, C2S, RO phase and C4AF content. According to the results of slag melting characteristic before and after slag splashing for less slag smelting, the present adjusting slag process has little effect. It is important to adjust the composition of BOF final slag. The (FeO) content in slag is to be reduced at the slag splashing and adjusting slag process for less slag smelting. 相似文献