[精品]宝钢lt灰及转炉渣 用于铁水预处理脱磷剂的实践.ppt

宝钢宝钢LT灰及转炉渣灰及转炉渣用于铁水预处理脱磷剂的实践用于铁水预处理脱磷剂的实践徐徐 兵兵 王兆达王兆达 丁建勇丁建勇二〇〇六年四月二〇〇六年四月铁水预处理简介铁水预处理简介铁水预处理铁水预处理hot metal pretreatment 1 1 铁水脱磷要素分析铁水脱磷要素分析1.11.1铁水脱磷的基本反应如下：铁水脱磷的基本反应如下：2[P] + 5(FeO) + 4(CaO) = (4CaO.P2O5) + 5[Fe]而在铁水脱磷的同时也伴随脱硫、补充脱硅：[FeS] + (CaO) = (CaS) + (FeO)(SiO2)+ 2(FeO)= (2FeO.SiO2)(2FeO.SiO2) + 2(CaO) = (2CaO.SiO2) + 2(FeO)1.2 1.2 有利于铁水脱磷的条件有利于铁水脱磷的条件① 提高炉渣碱度，即提高（CaO）的含量② 提高炉渣氧化性，即提高（FeO）的含量③ 较低的初始硅含量[Si]0④ 脱磷反应是放热反应，较低的铁水温度也有利于脱磷⑤ 适当加大渣量，即降低（P2O5）含量⑥ 采用复合喷吹等方式，改善反应条件2 2 宝钢宝钢LTLT灰和转炉渣用于铁水预处理脱磷粉剂的实践灰和转炉渣用于铁水预处理脱磷粉剂的实践 2.1 LT2.1 LT灰用于铁水脱磷剂灰用于铁水脱磷剂 2.11 LT灰用于铁水脱磷剂的可行性 (1)LT灰及烧结矿的成分分析(见表1)(2)表1 宝钢LT灰及烧结矿化学成分(%)(3)(2) LT灰的物性分析品名化学成分/%T.FeFe2O3CaOSiO2P2O5宝钢LT灰61.453.110.11.50.2宝钢烧结矿56.676.88.25---2.12 LT灰应用于铁水脱磷剂实绩分析(1)对比试验阶段 要求：每批试验≥20台次；目标：需求LT灰最佳掺量。

LT复合脱磷剂实验配比见表2：表2：LT灰复合脱磷剂实验配比 组分 批次 LT 灰烧结矿生石灰萤 石第Ⅰ配方15%40—45%30—35%5—10%第Ⅱ配方20%30—35%35—40%5—10%第Ⅲ配方35%20—25%30—35%5—10%第Ⅳ配方30%25—30%30—35%5—10%表3：LT灰复合脱磷剂实验铁水预处理实绩项 目平 均铁水量/t处理时间/min温 降/K处理后铁水成分 / %脱硫量×10-6脱硫率/%脱磷量×10-6脱磷率/%SP目 标---≤43≤120≤0.004≤0.025------------ⅠⅠ207.3207.324.024.0107.0107.00.00280.00280.0220.02227627689.289.248048068.768.7Ⅱ207.227.097.70.00350.02331689.750567.9Ⅲ198.827.8113.80.00350.02525888.553968.2ⅣⅣ202.0202.024.424.4107.3107.30.00200.00200.0250.02528728792.992.948348368.168.1 LT灰复合脱磷剂实验铁水预处理实绩脱磷见表3 ，相应冶金辅料单耗见表4：表4：LT灰复合脱磷剂冶金辅料单耗项 目烧结矿/（Kg/t）生石灰/（Kg/t）Na2CO3/（Kg/t）O2/（Kg/t）目 标≤20≤14≤8---第Ⅰ批15.0712.275.131.02第Ⅱ批11.0913.235.931.11第Ⅲ批9.5814.587.381.25第第ⅣⅣ批批9.009.0011.2511.256.396.391.101.10（2）验证试验阶段验证阶段铁水预处理实绩对比见表5：类别台次平均铁水量/t处理后铁水成分(%)处理时间/min温降/K脱硫率/%脱磷率/%Na2CO3/Kg/tS/D /Kg/tSiPS试验652060.0100.0100.0220.0220.00240.002425.525.5116.8116.892.392.370706.596.5935.7135.71常用512100.0110.0110.0210.0210.00240.002428.528.5112.7112.791.691.672725.945.9434.4134.41 表5 验证试验铁水预处理实绩对比2.2转炉渣应用于铁水脱磷剂2.21 转炉渣应用于铁水脱磷剂的可行性 (1) 宝钢转炉渣的成分分析(见表6)表6. 宝钢转炉渣的化学成分(%)CaOSiO2MgOFe2O3MnOP2O5Al2O3S46.407.746.7927.33.901.666.300.04(2)宝钢转炉渣物理性能2.22铁水预处理实绩分析对比 转炉渣的掺入量分别为A%和B%，范围在10%—40%，B =2 A。

铁水预处理实绩对比见表7：表7 转炉渣用于脱磷剂预处理对比试验实绩 类别 台次处理后铁水成分(%) 处理时间/min 温降/℃ 脱硫率%脱磷率%Na2CO3Kg/tS/D Kg/tSiPSA A12120.010.010.0170.0170.00160.001624.5824.58117.2117.294.4294.4276.9576.957.447.4432.1632.16同期510.0110.0210.002428.51112.791.6725.9434.41B330.010.0240.004727.7105.584.468.67.0637.52同期270.010.0240.002831.67109.691.6169.226.0740.453 经济及社会效益分析经济及社会效益分析 在铁水脱磷剂中掺入30%—35%LT灰或者10%—30%的钢渣，则每吨脱磷剂可降成本100—150元/吨目前宝钢二炼钢铁水预处理用脱磷剂计划量为20000吨/年，则可降成本200—300万/年，虽然总掺入量在4000—7000吨，经济效益也并非显著，但其社会效益不容忽视 4.4.结论结论4.14.1 宝钢LT灰可替代部分烧结矿、石灰等常用原料应用于脱磷剂；通过合理配料，当掺入30—35%的LT灰， LT灰复合脱磷剂与常用脱磷粉剂总体水平相当，能满足现场生产要求。

4.2 4.2 转炉渣具备高碱度、含Fe2O3的优势，CaO能提供碱剂、 Fe2O3能提供一定的氧位，因而，转炉渣足以替代脱磷剂中一部分石灰和氧化剂4.3 4.3 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