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Alternative TitlePreparation of Titanium Dioxide Pigment from Titanium Slag by Alkaline Molten Salt Method
Thesis Advisor齐涛 ; 初景龙
Degree Grantor中国科学院研究生院
Degree Discipline化学工程
Keyword钛渣   熔盐反应   预处理   钛液   粒度分布
Other AbstractIndustrial production methods of titanium dioxide pigments include the sulfate process and the chloride process, which discharge a large amount of toxic waste, resulting in serious environmental problems, also, requirement of raw material is harsh. A novel metallurgical clean process for production of titanium dioxide by decomposing titanium slag with NaOH molten salt was proposed. The aim of this process is to eliminate the pollution at the source and to fully utilize valuable compounds in titanium slag. The raw material in this paper furnace slag which contains TiO2 of 45% percent. it was produced by rotary furnace directed reduction circuit melting process via vanadium-bearing titanomagnetite, Making use of this slag through NaOH molten salt clean process is a huge breakthrough for comprehensive utilizationof vanadium-bearing titanomagnetite .The main points are as follows: (1) Solve the problem of the caking and adhesion of intermediate prduct via NaOH Molten Salt by using pretreatment method., Raw material and NaOH molten salt reacted at low temperature and low NaOH-to-slag mass ratio, and made a washing , thus changed the mineralogical structure and reduced the impurity content; Changes on occurrence of silicon elements in raw materials was studied by XRD, IR,EDS spectrum, BET and other means. Experimental conditions of the pretreatment was investigated.(2) A novel reaction system of molten NaOH and titanium slag was established. By thermodynamic calculation. Effects of reaction temperature, time, NaOH-to-slag mass ratio and particle size on titanium fractional conversion were studied. Approximately 98% of titanium in the slag could be converted under the optimal reaction conditions, and the product was characterized to be Na2TiO3 by XRD. The decomposition kinetics of titanium slag with molten NaOH under optimal reaction conditions indicates that the shrinking core model with chemical reaction controlled process is most applicable for the decomposition of titanium slag, with the apparent activation energy of 77.45kJ mol-1. (3) Improve the multi-stage countercurrent wash of molten reaction product. The leaching rate of each elements was studied. The effect of H2SO4 concentration silod-liquid-radio on titanium solution concentration and value of F was studied.we got a titanium solution of 180g/L ,F=1.85 and made the qualified particle size distribution of hydrous titanium oxides sucessfully. The chemical composition of the product is TiO2 98%,with Hunter white (Wh) 96. Influence of Mg2+、Al3+ on particle size distribution of hydrous titanium oxides was investigated. The result was: adding a certain concentration of Mg2+、Al3+ was helpful to inhibitiing the growing of hydrous titanium oxides, which lower the particle size.
Document Type学位论文
Recommended Citation
GB/T 7714
王淑奕. 碱熔盐法处理熔分钛渣制备钛白新工艺研究[D]. 中国科学院研究生院,2013.
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碱熔盐法处理熔分钛渣制备钛白新工艺研究.(2602KB) 限制开放CC BY-NC-SAApplication Full Text
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