(河南理工大學(xué) 化學(xué)化工學(xué)院，焦作 454000)
摘 要: 赤泥活化焙燒-聯(lián)合浸出制備富鈦料并分離有價(jià)組分，考察參數(shù)對各金屬浸出率的影響，并對活化焙燒-聯(lián)合浸出過程中組分溶解行為進(jìn)行了理論分析。結(jié)果表明：在鹽酸濃度為5 mol/L、液固比為6 mL/g、浸出溫度為80 ℃和浸出時(shí)間為90 min的條件下，鋁、鐵、鈉、鈣和鈦的浸出率分別為81.2%、76.3%、99.2%、99.3%和3.2%，同時(shí)稀有金屬釩、鈧和釔的浸出率均超過95%。在焙燒溫度為550 ℃、堿渣比為2、焙燒時(shí)間為40 min、水浸溫度為80 ℃、液固比為7 mL/g、浸出時(shí)間為60 min的條件下，硅浸出率可達(dá)85.7%，可獲得TiO2品位為71.8%的富鈦料。鈦酸鈉和少量未反應(yīng)的石英存在于富鈦料中，TiO2能夠穩(wěn)定存在于Fe3+、Al3+和 的溶液體系中。釩和硅的浸出過程均受內(nèi)擴(kuò)散控制，浸出表觀活化能分別為10.76 kJ/mol和10.61 kJ/mol，而鐵的酸浸表觀活化能達(dá)到23.86 kJ/mol。
關(guān)鍵字: 赤泥；富鈦料；活化焙燒；聯(lián)合浸出；有價(jià)組分
（School of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo Henan, 454000, China）
Abstract:Titanium-rich materials were prepared and valuable components were separated from red mud by active roasting and combined leaching. The effects of parameters on the leaching efficiency of aluminum, iron, sodium, calcium and titanium were investigated. The dissolution behavior of components in the process of active roasting and combined leaching was theoretically analyzed. The results show that the leaching efficiencies of aluminum, iron, sodium, calcium and titanium are 81.2%, 76.3%, 99.2%, 99.3%, respectively, under the conditions of HCl concentration of 5 mol/L, liquid-solid ration of 6 mL/g, leaching temperature of 80 ℃ and leaching time of 90 min, respectively. The leaching efficiencies of vanadium, scandium and yttrium are more than 95%. The leaching efficiency of silicon reaches 85.7% and the titanium-rich material with TiO2 grade of 71.8% is obtained by roasting with alkali slag ratio of 2 at 550 ℃ for 40 min and liquid-solid ratio of 7 mL/g at 80 ℃ for 60 min. The sodium titanate and some unreacted quartz exist in the titanium-rich material. TiO2 exists stably in the solution system of Fe3+, Al3+ and . The leaching processes of vanadium and silicon are controlled by internal diffusion. The apparent activation energies of vanadium, silicon and iron are 10.76 kJ/mol, 10.61 kJ/mol and 23.86 kJ/mol, respectively.
Key words: red mud; titanium-rich material; active roasting; combined leaching; valuable component
