低品位钛渣酸解反应试验研究  

Experimental study on the acidolysis reaction of low-grade titanium slag

作　　者：李凯茂[1] 王海波[1] 肖军[1] Li Kaimao;Wang Haibo;Xiao Jun(State Key Laboratory for Comprehensive Utilization of Vanadium and Titanium Resources,Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,Sichuan,China)

机构地区：[1]钒钛资源综合利用国家重点实验室,攀钢集团研究院有限公司,四川攀枝花617000

出　　处：《钢铁钒钛》2022年第1期13-18,98,共7页Iron Steel Vanadium Titanium

摘　　要：针对低品位钛渣酸解率低的问题,研究了低品位钛渣和74渣的物相组成、钛渣酸解温度曲线和化学反应标准生成热之间的差异,考察了反应酸浓度、引发温度、主反应时间、酸渣比对低品位钛渣酸解率的影响。结果表明:低品位钛渣酸解率低不是由难溶于硫酸的物相引起,而是与酸解反应速率有关;引发温度高引起酸解反应速率快、主反应时间短是低品位钛渣酸解率低的主要原因之一;适当降低引发温度,可以满足低品位钛渣酸解需要外加热补充热量需求;通过降低反应酸浓度和引发温度,延长主反应时间,1;渣的酸解率由78.98%提高至94.31%,2;渣的酸解率由71.77%提高至91.19%;与优化前相比,酸解工艺优化后残渣物相中黑钛石相(M_(2)TiO_(5))峰值减弱,且新增了辉石相(Ca(Mg,Fe,Al)(Si,Al)_(2)O_(6))。Regarding the problem that low acidolysis rate occurs frequently at the beginning of the experiment in low-grade titanium slag,an investigation was proposed to elaborate the relationship among the phase composition,acidolysis temperature curve,and standard heat of reaction for the chemical reaction in low-grade titanium slag and slag 74(the titanium slag is 74%).Moreover,the effects of acid concentration,initiation temperature,primary reaction time,and acid-slag ratio on the acid hydrolysis rate of low-grade titanium slag were also investigated.The results show that the low acidolysis rate in low-grade titanium slag is not caused by the formation of the insoluble sulfuric acid phase but is related to the acidolysis reaction rate.One of the main reasons for the increasing acidolysis reaction rate and the decreasing primary reaction time in low-grade titanium is the increased initiation temperature.Appropriately reducing the initiation temperature can meet the demand of external heating to supplement heat for acidolysis in low-grade titanium slag.The acidolysis rate of slag 1;increases from 78.98%to 94.31%,and that of slag 2;increases from 71.77%to 91.19%,respectively,by reducing the concentration of reaction acid and the initiation temperature and prolonging the primary reaction time.In addition,compared with the phase of the residue obtained before optimization,the peak value about M_(2)TiO_(5)is decreased,and a new phase(Ca(Mg,Fe,Al)(Si,Al)_(2)O_(6))is formed in the phase of the residue.

关 键 词：低品位钛渣 酸解反应 引发温度 主反应时间 

分 类 号：TF823[冶金工程—有色金属冶金]