Study on iron removal from industrial titanium gypsum
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摘要: 针对硫酸酸浸钛石膏进行除铁工艺研究，去除钛石膏中的铁离子杂质，实现钛石膏纯度和白度的有效改善，为钛石膏下游产品的开发利用提供充足的原料。试验研究了固液比、反应温度、反应时间、转速、粒度和硫酸浓度等不同酸浸条件下的除铁效果，获得适宜的工艺条件，结合其物相、微观相貌、粒度分布等属性的变化情况，同时探讨了钛石膏除杂机理。结果表明，在钛石膏硫酸酸浸除杂过程中，适宜的工艺条件为：固液比为 1：10 g/g、反应温度为70 ℃、反应时间为60 min、SO42−质量分数为7%、转速为 400 r/min、粒度为150 μm，此时钛石膏除铁率可达到94%，白度有了明显的改善。Abstract: In this study, the removal of iron impurity contained in the industrial sulfuric acid leaching titanium gypsum was investigated, which leads to effective improvement of purity and whiteness of titanium gypsum, providing sufficient raw materials for the development and utilization of titanium gypsum downstream products. The effect of iron removal under different acid leaching conditions such as solid-liquid ratio, reaction temperature, reaction time, rotation speed, particle size and sulfuric acid concentration was studied and the optimum process conditions was discovered. Furthermore, the impurity removal mechanism of titanium gypsum was found out based on the changes of phase, microstructure and particle size distribution. During the process of removing iron from titanium gypsum by sulfuric acid leaching, the optimal process parameters are obtained as follows: solid-liquid ratio of 1:10 g/g, reaction temperature of 70 ℃, reaction time of 60 min, SO42− mass fraction of 7%, rotating speed of 400 r/min and particle size of 150 μm, under which the iron removal leaching rate of titanium gypsum can reach 94%. Under the optimal conditions, the acid leaching product changes from light yellow to gray white, and the whiteness is evidently improved.
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Key words:
- titanium gypsum /
- iron removal /
- Fe2+ /
- sulfuric acid /
- solid-liquid ratio /
- reaction temperature /
- leaching rate
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图 2 液固比对铁的浸取率的影响
Figure 2. Influence of liquid-solid ratio on the leaching rate of iron
图 3 反应温度对铁的浸取率的影响
Figure 3. Influence of reaction temperature on leaching rate of iron
图 7 硫酸浓度对铁的浸出率的影响
Figure 7. Influence of sulfuric acid concentration on leaching rate of iron
图 10 改变固液比条件下酸浸产物白度变化情况
Figure 10. Whiteness change of acid leaching products under the condition of changing solid-liquid ratio
图 11 最优条件下酸浸产物的白度
Figure 11. Whiteness diagram of acid leaching products under optimal conditions
表 1 钛石膏主要元素组成
Table 1. Main element composition of titanium gypsum
% O Fe Ca S C Al Mn Mg Zn Si 52.79 20.98 11.75 10.88 2.04 0.43 0.42 0.34 0.23 0.08 
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表 2 钛石膏原样及优化后试样的粒径点分布
Table 2. Particle size distribution of titanium gypsum samples
粒径/μm 含量/% 原样 优化后 ≤1 9.37 5.42 1~2 7.18 3.85 2~5 12.31 9.28 5~10 10.60 10.60 10~20 12.54 15.85 20~45 17.70 25.79 45~75 13.76 15.32 75~100 6.75 6.38 100~200 9.00 6.80 200~300 0.79 0.71
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