【摘要】：鈦作為繼鋁、鐵之后的第三大金屬,已經(jīng)成為國民經(jīng)濟社會發(fā)展水平及戰(zhàn)略地位的標志。海綿鈦作為鈦冶金工業(yè)的重要加工原料,主要通過鎂還原四氯化鈦制得,然而,工業(yè)制備的粗四氯化鈦中含有大量有害雜質(zhì),它們的存在將嚴重影響海綿鈦的質(zhì)量,因此,粗四氯化鈦精制提純工藝對提高海綿鈦質(zhì)量和制備高純鈦具有重要意義。本論文建立在攀鋼海綿鈦廠實際生產(chǎn)基礎(chǔ)上,對粗四氯化鈦精制工序中常出現(xiàn)的雜質(zhì)含量過高,產(chǎn)率偏低等問題進行針對性的實驗及基礎(chǔ)理論分析研究。為了分析精制過程中Ti的走向及其損失,對精制工序整體物料平衡進行計算得知：Ti的損失主要是尾氣損失和干渣餅損失,其中尾氣損失占總鈦量的1.064%；干渣餅損失占總鈦量的1.052%。按照Ti的收率計算,加入的粗TiC14中所含Ti和產(chǎn)物中精TiC14中所含的Ti,整個精制工序系統(tǒng)收率為97.884%。借助HSC軟件對除釩漿液制備過程中化學(xué)反應(yīng)過程的模擬,從而對除釩漿液制備過程進行熱平衡分析,即熱收入(化學(xué)自產(chǎn)熱)與熱支出(提升系統(tǒng)溫度所需熱量和環(huán)境的散熱損失)的收支平衡。分析結(jié)果得出,該方法形成了完整的熱平衡體系,用以驗證實際化驗結(jié)果的準確性以及反映除釩漿液質(zhì)量的好壞。除釩漿液中TiCl3和AlCl3的含量的影響分析得知：鋁粉懸浮液固含量、氯氣壓力、氯氣通入量、保溫時間的增加都會使AlCl3的濃度升高,影響TiCl3的濃度升高的因素則是鋁粉懸浮液固含量、氯氣通入量、最高溫度、保溫時間的增加；停氯溫度升高卻會降低二者的濃度。較優(yōu)工藝參數(shù)如下：鋁粉懸浮液固含量,20～45 g/l；氯氣壓力,120～150 kPa；氯氣通入量,8～11 kg；停氯溫度,95～105℃；最高溫度128℃;保溫時間≥7 min。通過對精制除雜過程的影響因素分析得出：粗四氯化鈦固相物含量偏高導(dǎo)致蒸餾除釩系統(tǒng)殘渣排放量大和蒸餾系統(tǒng)產(chǎn)能偏低,同時也是精制系統(tǒng)產(chǎn)能較低的直接原因。而粗四氯化鈦中VOCI3、SiCl4、AlCl3、FeCl3含量遠高于設(shè)計值也將不同程度的影響精制系統(tǒng)的產(chǎn)率。通過HSC軟件對TiCl4水解過程的模擬得出：嚴格控制水解劑的添加量,可以降低TiCl4的損失,同時,水解劑添加過多,將會給溶液帶來種類繁多的雜質(zhì),而且很有可能將AlOCl沉淀重新溶解為AlC13水合物,導(dǎo)致水解失敗。采用NaOH溶液代替水進行粗四氯化鈦的水解反應(yīng)得知,NaOH溶液擁有同樣的水解除鋁效果,且隨著NaOH濃度的升高,反應(yīng)越平和,有助于減小事故(因水解反應(yīng)過于劇烈)發(fā)生的概率,因此在成本預(yù)算允許范圍內(nèi),可以采用合適濃度的NaOH溶液代替水進行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，

本文編號：2214851