Study on enrichment of titanium resources by treating titanium middling ore with KOH sub molten salt
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摘要: 采用KOH亚熔盐处理钛中矿以实现钛资源的富集，考察了反应温度、反应时间、碱浓度和钛中矿粒度等因素对钛中矿分解情况的影响，采用X射线衍射分析了产物的物相，得出下述结论：①采用KOH亚熔盐处理钛中矿可实现钛中矿的有效分解，其较佳工艺参数为搅拌速度400 r/min，碱渣质量比6∶1，反应温度为240 °C，反应时间180 min，碱浓度为80%，原料粒度70~80 μm，在此反应条件下，钛中矿中钛的转化率达99%以上，铝的转化率98%以上，硅的转化率在85%以上；②X射线衍射分析表明，亚熔盐分解产物经800 °C的高温煅烧3 h后测得的产物主要为六钛酸钾（K2Ti6O13），说明KOH可有效分解钛中矿并去除其中的铝、硅等元素。Abstract: The treatment of titanium middling ore with KOH sub molten salt was studied to realize the enrichment of titanium resources. The effects of reaction temperature, reaction time, alkali concentration and particle size on the decomposition of titanium middling ore were investigated, and the phase of the product was analyzed by X-ray diffraction. The following conclusions were drawn. Firstly, the effective decomposition can be realized by treating titanium middling ore with KOH sub molten salt. The better process parameters include stirring speed of 400 r/min, alkali residue mass ratio of 6∶1, reaction temperature of 240 ℃, reaction time of 180 min, alkali concentration of 80%, raw material particle size of 70~80 µm. Under these reaction conditions, the decomposition rate of titanium in the ore is more than 99% , while the decomposition rate of aluminum and silicon is more than 98% and 85%, respectively. Secondly, X-ray diffraction analysis shows that the decomposition product of sub molten salt is mainly potassium hexatitanate (K2Ti6O13) after calcination at 800 ℃ for 3 h, indicating that KOH can effectively decompose titanium middling ore and remove aluminum, silicon and other elements.
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Key words:
- titanium extraction /
- titanium middling ore /
- KOH sub molten salt /
- decomposition rate
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图 2 反应温度对钛、铝、硅转化率的影响
Figure 2. Effect of reaction temperature on conversion of Ti, Al and Si
图 4 碱浓度对钛、铝、硅转化率的影响
Figure 4. Effect of KOH concentration on conversion of Ti, Al and Si
图 5 粒度对钛、铝、硅转化率的影响
Figure 5. Effect of mineral particle size on conversion of Ti, Al and Si
图 6 碱矿质量比对钛、铝、硅转化率的影响
Figure 6. Effect of mass ratio of alkali to ore on conversion of Ti, Al and Si
图 7 搅拌速度比对钛、铝、硅转化率的影响
Figure 7. Effect of stirring speed on conversion of Ti, Al and Si
图 8 产物经 800 ℃煅烧 3 h 后的 X 射线衍射谱
Figure 8. X-ray diffraction spectrum of the product calcined at 800 ℃ for 3 h
表 1 钛中矿的化学组成
Table 1. Main chemical composition of the titanium middling ore
% TiO2 TFe FeO MgO SiO2 CaO Al2O3 29.62 33.56 30.08 4.27 8.07 2.29 2.38 
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表 2 优化工艺条件下钛中矿的分解情况
Table 2. Decomposition of titanium middling ore under optimized process conditions
编号 转化率/% Ti Al Si 1 99.1 98.2 85.8 2 99.1 98.4 86.1 3 99.2 98.1 85.9
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