摘要
利用低温碱溶液及熔体浸出对两种不同的高钛渣进行脱硅,研究温度、时间及氢氧化钠溶液浓度对脱硅率的影响。熔体除硅可导致高钛渣中的钛损失。用4 mol/L的氢氧化钠溶液浸出高钛渣,在温度为80℃、搅拌速率为600 r/min及保温时间为300 min的条件下,国内高钛渣中硅含量由0.96%(质量分数)降低至0.29%(质量分数),脱硅率为69.8%。在相同条件下,进口的高钛渣中硅含量由1.11%(质量分数)降低至0.12%(质量分数),脱硅率为89.2%。对采用镁还原高钛渣得到的合金粉末进行烧结,制备钛合金,并对合金进行表征。结果表明,钛合金中的Ti_(5)Si_(3)相已成功去除,此外,对两种高钛渣原料进行对比分析,并利用热力学软件对脱硅原理进行分析。
Silicon in two types of upgraded titania slag(UGS)containing different components was removed using a low-temperature alkali solution and melt leaching.The effects of temperature,time,and NaOH solution concentration on desilication rate were investigated.Desilication in melt can lead to the loss of titanium in upgraded titania slag.After agitating at a speed of 600 r/min and 80℃for 300 min,the silicon content in domestic slag decreased from 0.96 wt.%to 0.29 wt.%,and the leaching rate was 69.8%after leaching in 4 mol/L sodium hydroxide solution.Under the same conditions,the silicon content in imported slag decreased from 1.11 wt.%to 0.12 wt.%,and the desilication rate was up to 89.2%.The alloy powders obtained from the reduction of upgraded titania slag with magnesium were sintered to produce titanium alloy,and the alloy was characterized.It was determined that the Ti_(5)Si_(3)phase in the titanium alloy product was successfully eliminated.In addition,the two UGS materials and the chemical principle of desiliconization were analyzed using a thermodynamic software.
作者
董朝望
郭学益
夏阳
刘沛东
乔晋玺
李中臣
刘汉宁
Zhao-wang DONG;Xue-yi GUO;Yang XIA;Pei-dong LIU;Jin-xi QIAO;Zhong-chen LI;Han-ning LIU(School of Metallurgy and Environment,Central South University,Changsha 410083,China;Research Institute of Resource Recycling,Central South University,Changsha 410083,China)
基金
the National Natural Science Foundation of China(No.52004342)
Innovation-driven Project of Central South University,China(No.150240015)
Natural Science Fund for Outstanding Young Scholar of Hunan Province,China(No.2021JJ20065).
