粗四氯化钛精制及铝粉除钒机理研究
发布时间：2018-08-31 11:30
【摘要】：钛作为继铝、铁之后的第三大金属,已经成为国民经济社会发展水平及战略地位的标志。海绵钛作为钛冶金工业的重要加工原料,主要通过镁还原四氯化钛制得,然而,工业制备的粗四氯化钛中含有大量有害杂质,它们的存在将严重影响海绵钛的质量,因此,粗四氯化钛精制提纯工艺对提高海绵钛质量和制备高纯钛具有重要意义。本论文建立在攀钢海绵钛厂实际生产基础上,对粗四氯化钛精制工序中常出现的杂质含量过高,产率偏低等问题进行针对性的实验及基础理论分析研究。为了分析精制过程中Ti的走向及其损失,对精制工序整体物料平衡进行计算得知：Ti的损失主要是尾气损失和干渣饼损失,其中尾气损失占总钛量的1.064%；干渣饼损失占总钛量的1.052%。按照Ti的收率计算,加入的粗TiC14中所含Ti和产物中精TiC14中所含的Ti,整个精制工序系统收率为97.884%。借助HSC软件对除钒浆液制备过程中化学反应过程的模拟,从而对除钒浆液制备过程进行热平衡分析,即热收入(化学自产热)与热支出(提升系统温度所需热量和环境的散热损失)的收支平衡。分析结果得出,该方法形成了完整的热平衡体系,用以验证实际化验结果的准确性以及反映除钒浆液质量的好坏。除钒浆液中TiCl3和AlCl3的含量的影响分析得知：铝粉悬浮液固含量、氯气压力、氯气通入量、保温时间的增加都会使AlCl3的浓度升高,影响TiCl3的浓度升高的因素则是铝粉悬浮液固含量、氯气通入量、最高温度、保温时间的增加；停氯温度升高却会降低二者的浓度。较优工艺参数如下：铝粉悬浮液固含量,20～45 g/l；氯气压力,120～150 kPa；氯气通入量,8～11 kg；停氯温度,95～105℃；最高温度128℃;保温时间≥7 min。通过对精制除杂过程的影响因素分析得出：粗四氯化钛固相物含量偏高导致蒸馏除钒系统残渣排放量大和蒸馏系统产能偏低,同时也是精制系统产能较低的直接原因。而粗四氯化钛中VOCI3、SiCl4、AlCl3、FeCl3含量远高于设计值也将不同程度的影响精制系统的产率。通过HSC软件对TiCl4水解过程的模拟得出：严格控制水解剂的添加量,可以降低TiCl4的损失,同时,水解剂添加过多,将会给溶液带来种类繁多的杂质,而且很有可能将AlOCl沉淀重新溶解为AlC13水合物,导致水解失败。采用NaOH溶液代替水进行粗四氯化钛的水解反应得知,NaOH溶液拥有同样的水解除铝效果,且随着NaOH浓度的升高,反应越平和,有助于减小事故(因水解反应过于剧烈)发生的概率,因此在成本预算允许范围内,可以采用合适浓度的NaOH溶液代替水进行TiCl4水解。
[Abstract]:Titanium, as the third largest metal after aluminum and iron, has become the symbol of national economy and social development level and strategic position. Sponge titanium, as an important processing material in titanium metallurgical industry, is mainly prepared by magnesium reduction of titanium tetrachloride. However, there are a large number of harmful impurities in the coarse titanium tetrachloride prepared by industry, and their existence will seriously affect the quality of sponge titanium. The purification process of coarse titanium tetrachloride plays an important role in improving the quality of sponge titanium and preparing high purity titanium. Based on the practical production of sponge titanium plant of Panzhihua Iron and Steel Co. In order to analyze the trend and loss of Ti in refining process, the overall material balance of refining process is calculated. It is found that the loss of W Ti mainly consists of tail gas loss and dry slag cake loss, in which tail gas loss accounts for 1.064% of the total titanium content. The loss of dry slag cake accounted for 1.052% of the total titanium content. According to the yield of Ti, the yield of the whole refining process of Ti, contained in the crude TiC14 and the refined TiC14 in the product was 97.884. The chemical reaction process during the preparation of vanadium removal slurry was simulated by HSC software, and the heat balance of the preparation process was analyzed. That is, heat income (chemical heat) and heat expenditure (heat required to raise the temperature of the system and environmental heat loss) balance. The results show that the method forms a complete thermal equilibrium system to verify the accuracy of the actual test results and reflect the quality of vanadium removal slurry. The analysis of the effect of TiCl3 and AlCl3 in vanadium removal slurry shows that the concentration of AlCl3 increases with the increase of solid content of aluminum powder suspensions, chlorine pressure, chlorine gas flux and holding time. The factors that influence the concentration of TiCl3 are the increase of solid content of aluminum powder suspension, the amount of chlorine gas entering, the maximum temperature and the holding time, but the increase of stopping chlorine temperature will decrease the concentration of both. The optimum technological parameters are as follows: solid content of aluminum powder suspension is 204g / l; chlorine pressure is 120,150 kPa; chlorine flux is 811 kg; stopping chlorine temperature is 95 ~ 105 鈩，
本文编号：2214851
[Abstract]:Titanium, as the third largest metal after aluminum and iron, has become the symbol of national economy and social development level and strategic position. Sponge titanium, as an important processing material in titanium metallurgical industry, is mainly prepared by magnesium reduction of titanium tetrachloride. However, there are a large number of harmful impurities in the coarse titanium tetrachloride prepared by industry, and their existence will seriously affect the quality of sponge titanium. The purification process of coarse titanium tetrachloride plays an important role in improving the quality of sponge titanium and preparing high purity titanium. Based on the practical production of sponge titanium plant of Panzhihua Iron and Steel Co. In order to analyze the trend and loss of Ti in refining process, the overall material balance of refining process is calculated. It is found that the loss of W Ti mainly consists of tail gas loss and dry slag cake loss, in which tail gas loss accounts for 1.064% of the total titanium content. The loss of dry slag cake accounted for 1.052% of the total titanium content. According to the yield of Ti, the yield of the whole refining process of Ti, contained in the crude TiC14 and the refined TiC14 in the product was 97.884. The chemical reaction process during the preparation of vanadium removal slurry was simulated by HSC software, and the heat balance of the preparation process was analyzed. That is, heat income (chemical heat) and heat expenditure (heat required to raise the temperature of the system and environmental heat loss) balance. The results show that the method forms a complete thermal equilibrium system to verify the accuracy of the actual test results and reflect the quality of vanadium removal slurry. The analysis of the effect of TiCl3 and AlCl3 in vanadium removal slurry shows that the concentration of AlCl3 increases with the increase of solid content of aluminum powder suspensions, chlorine pressure, chlorine gas flux and holding time. The factors that influence the concentration of TiCl3 are the increase of solid content of aluminum powder suspension, the amount of chlorine gas entering, the maximum temperature and the holding time, but the increase of stopping chlorine temperature will decrease the concentration of both. The optimum technological parameters are as follows: solid content of aluminum powder suspension is 204g / l; chlorine pressure is 120,150 kPa; chlorine flux is 811 kg; stopping chlorine temperature is 95 ~ 105 鈩，
本文编号：2214851
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