高镁炉渣性能研究进展

简要介绍高镁炉渣性能研究现状与进展及该研究对冶金生产过程的重要性 。

酸浸法回收利用非淬水高镁炉渣中铁的研究

以非淬水高镁炉渣为原料,采用硝酸对其进行酸解处理,通过调节炉渣滤液中的pH,沉淀回收其中的铁,并制成Fe_2O_3产品。采用红外光谱对Fe_2O_3进行定性分析,采用X射线荧光光谱仪对炉渣组成和Fe_2O_3含量进行分析。系统性考察了硝酸质量分数、酸解温度、酸解时间、pH以及氢氧化钠质量分数对炉渣中Fe回收利用的影响。结果表明该回收利用工艺是可行的。回收利用非淬水高镁炉渣中的铁制备Fe_2O_3的工艺条件:硝酸质量分数为60%、酸解温度为60℃、酸解时间为50 min、pH为8.6、氢氧化钠质量分数为20%。在以上工艺条件下,炉渣粉末为20 g时Fe_2O_3产量为0.86 g,Fe_2O_3纯度达到93.6%。

酸浸法高镁炉渣制备白炭黑的研究

以非淬水高镁炉渣为原料,采用酸浸法利用其中的二氧化硅制备白炭黑产品。采用红外光谱对白炭黑进行定性分析,采用X射线荧光光谱仪对白炭黑进行含量分析。考察了盐酸浓度、反应时间、反应温度和洗涤次数对白炭黑制备的影响。得到制备白炭黑的最佳工艺条件:盐酸浓度为4.0 mol/L、反应温度为55℃、反应时间为2.5 h、洗涤次数为6次,在该工艺条件下,从20 g炉渣中可制备白炭黑产量为10.90 g,白炭黑产品纯度达到90.2%。

Effect of content of Al_2O_3 and MgO on crystallization of blast furnace slag during fiber formation

The simulation of blast furnace slag was prepared by pure chemical reagents.Test methods like DSC,XRD and SEM were used to study the effect of Al2O3 and MgO content on crystallization of blast furnace slag during fiber formation.The results show that as Al2O3 and MgO contents in the sample changed,blast furnace slag was crystallized at the average temperature below 1232 K.When the ratio of Mg/Al in the samples is 0.6 calculated by Kissinger equation,crystallization activation energy is at the maximum value and the system is in the most stable condition.The sample crystallization phases are mainly calcium akermanite(2CaO?MgO?2SiO2)and gehlenite(2CaO?Al2O3?SiO2).Secondary crystallization phases are anorthite(CaAl2Si2O8),wollastonite minerals(WOLLA)and pyroxene minerals(cPyrA).Meanwhile,the principal crystallization phases of the samples are different types and have different contents,and the microstructures of the sample sections are different due to the difference between MgO/Al2O3 ratio.