Abstract：How to further improve the acidolysis recovery rate was always focused in sulfate process titanium dioxide, and the level of acidolysis recovery rate was closely related to the transformation of titanium-containing phases. The continuous acidolysis process was selected as an example to investigate the change characteristics of titanium-containing phases during the reaction. The mineral analyzer, X-ray diffractometer (XRD), scanning electron microscope (SEM) and some chemical analysis methods were synthetically applied to determine the variation characteristics on content and morphology of main phases in titanium concentrate during the reaction process, as well as the variation characteristics on content and occurrence of Ti and Si elements. The results showed that the titanium concentrate was mainly composed of ilmenite and silicate minerals. In process of acidolysis, the acid permeated into interior along the edges or cracks of ilmenite particles to finally decompose the mineral. Meanwhile, the content of ilmenite decreased from 86.13% (mass fractrion, the same below) in titanium concentrate to 14.38% in residue 4#. During this process, the quartz and diopside were enriched. Their contents increased gradually from 0.06% and 1.58% in titanium concentrate to 50.85% and 14.92% in residue 4#, respectively. In the reaction process, the content of Ti in titanium concentrate decreased from 26.74% to 6.46% in residue 4#, while the content of Si increased from 2.19% to 29.14%. During the reaction process, the occurrence ratio of Ti gradually decreased from 96.08% in titanium concentrate to 64.88% in residue 4#, and Ti migrated mainly from ilmenite to TiOSO4. Partial Ti elements were encased by quartz and its mixture, leading to the loss of Ti. The main occurrence phases of Si were gradually converted from ilmenite and silicates such as pyroxene in titanium concentrate to quartz and diopside in residue 4#, and the occurrence ratio of Si in quartz increased significantly from 0.79% in titanium concentrate to 73.78% in residue 4#.
刘飞生,谢刚,于站良,等.氯化法生产钛白工艺的研究进展[J].材料导报,2014,28(8):113-117.LIU Fei-sheng,XIE Gang,YU Zhan-liang,et al.Research and development of titania powders by chlorination technology[J].Materials Review,2014,28(8):113-117.
[2]
赵泽权,刘建良,杨光灿,等.基于SWOT分析的氯化法钛白工艺技术发展研究[J].新技术新工艺,2013(9):100-102.ZHAO Ze-quan,LIU Jian-liang,YANG Guang-can,et al.Research on development of chloride process titanium dioxide technology based on SWOT analysis[J].New Technology & New Process,2013(9):100-102.
[3]
江书安,刘建良,李雪刚.中国氯化钛白现状及发展趋势[J].有色金属设计,2016,43(3):60-64.JIANG Shu-an,LIU Jian-liang,LI Xue-gang.Current situations and development tendencies of titanium dioxide with chloride process of China[J].Nonferrous Metals Design,2016,43(3):60-64.
[4]
崔佳娜,任慧莉.我国钛白粉生产工艺技术的发展及比较[J].稀有金属与硬质合金,2013,41(4):14-17.CUI Jia-na,REN Hui-li.Development and comparison of titanium white production technology in China[J].Rare metals and Cemented Carbidies,2013,41(4):14-17.
[5]
丁浩,刘玉芹,周红.中国钛白粉生产环境效应及可持续发展[J].地学前缘,2014,21(5):294-300.DING Hao,LIU Yu-qin,ZHOU Hong.The effect of resources and environment on titanium dioxide production and countermeasures for sustainable development in China[J].Earth Science Frontiers,2014,21(5):294-300.
[6]
Wolf-D Griebler,JörgHocken,Klaus Schulte.进入21世纪的硫酸法钛白工业[J].涂料工业,2004,34(4):58-59.Wolf-D Griebler,JörgHocken,Klaus Schulte.Sulphuric acid titanium dioxide industry in the 21st century[J].Paint & Coatings Industry,2004,34(4):58-59.
[7]
王斌.深还原钛渣硫酸法制取钛白实验研究[J].无机盐工业,2013,45(10):36-38.WANG Bin.Study on preparation of titanium dioxide from further reduced titanium slag[J].Inorganic Chemicals Industry,2013,45(10):36-38.
[8]
邹建新.钒钛物理化学[M].北京:化学工业出版社,2016.
[9]
龚家竹.硫酸法钛白生产酸解工艺技术的回顾与展望[J].无机盐工业,2014,46(7):1-7.GONG Jia-zhu.Reviewed and prospect on acidolysis techniques in titanium dioxide manufacturing with sulfuric acid process[J].Inorganic Chemicals Industry,2014,46(7):1-7.
[10]
罗志强.连续酸解技术在硫酸法钛白生产中的应用[J].无机盐工业,2012,44(3):33-35.LUO Zhi-qiang.Application of continuous acidolysis in TiO2 production by sulfuric acid process[J].Inorganic Chemicals Industry,2012,44(3):33-35.
[11]
张成刚,郑少华,杜长山,等.钛铁矿硫酸浸出动力学研究[J].化学反应工程与工艺,2000,16(4):319-324.ZHANG Cheng-gang,ZHENG Shao-hua,DU Chang-shan,et al.Leaching kinetics of ilmenite in sulfuric acid[J].Chemical Reaction Engineering and Technology,2000,16(4):319-324.
[12]
景建林,张全忠,邱礼有,等.硫酸法钛白生产中钛铁矿液相酸解反应的实验研究[J].化学反应过程与工艺,2003,19(4):337-342.JING Jian-lin,ZHANG Quan-zhong,QIU Li-you,et al.An investigation on the liquid phase digestion of ilmenite in sulfate process TiO2 pigment production[J].Chemical Reaction Engineering and Technology,2003,19(4):337-342.
[13]
许惠,傅敏.钛白废液的治理与综合利用研究进展[J].矿产综合利用,2006(4):34-37.XU Hui,FU Min.Research progress in comprehensive utilization of spent acid and waste in titanium dioxide production[J].Multipurpose Utilization of Mineral Resources,2006(4):34-37.
[14]
唐文骞.硫酸法钛白生产中的环保治理措施[J].无机盐工业,2007,39(7):39-41.TANG Wen-qian.Enviroment control measures in titanium white production by H2SO4 process[J].Inorganic Chemicals Industry,2007,39(7):39-41.
[15]
王建伟,任秀莲,魏琦峰,等.钛白废酸的综合利用研究现状及展望[J].无机盐工业,2009,41(9):4-7.WANG Jian-wei,REN Xiu-lian,WEI Qi-feng.Current research situation and prospect for comprehensive utilization of waste acid from titanium dioxide production[J].Inorganic Chemicals Industry,2009,41(9):4-7.
