AciddigestionFeTiO, + 3H,SO4 (conc.) → Ti(SO4)2 + FeSO4 + 3H,0Ti(SO4)2 + 2H,O → TiO2 + 2H,SO4Slight dilution with water, followed by crystallizationdeposits green FeSO2H,O. Upon diluting the motherliquor and boiling,hydrated TiO, gets precipated
16 ③ Acid digestion FeTiO3 + 3H2 SO4 (conc.) → Ti(SO4 ) 2 + FeSO4 + 3H2O Ti(SO4 ) 2 + 2H2O → TiO2 + 2H2 SO4 Slight dilution with water, followed by crystallization deposits green FeSO4 •2H2O. Upon diluting the mother liquor and boiling, hydrated TiO2 gets precipated
④AcidfusionFeTiO, + 4KHSO4→ FeSO4 + TiOSO4 + 2K,SO + 2H,0TiOSO4 + H,O → TiO, +H,SO4 (△)Powered ilmenite is fused with six times its weight ofKHSO. Upon cooling, water extract leaves insolubleTiOSO as the residue. Upon boiling the residue withwater, hydrolysis of basic sulphate is complete to TiO
17 ④ Acid fusion FeTiO3 + 4KHSO4 → FeSO4 + TiOSO4 + 2K2 SO4 + 2H2O TiOSO4 + H2O → TiO2 + H2 SO4 (△) Powered ilmenite is fused with six times its weight of KHSO4 . Upon cooling, water extract leaves insoluble TiOSO4 as the residue. Upon boiling the residue with water, hydrolysis of basic sulphate is complete to TiO2
Kroll'sprocess2FeTiO, + 6C + 7Cl → 2FeCl + 2TiCl4 + 6CO(1200K)Ti0, + 3C → TiC + 2C0 (600K)TiC +2Cl → TiCl4 + C (600K)TiCl + (2+n)H,O → TiO,'nH,O + 4HClIf the ore is preroasted with coke around 1400K, some carbidesare formed.1.Separation of Ti and Zr2.Fractional distillation of chloridesAdd water to TiSO4 +ZrSO4 / 浓H,SO4 → Zr(SO4),:4H,Ol
18 ⑤ Kroll’s process 2FeTiO3 + 6C + 7Cl2 → 2FeCl3 + 2TiCl4 + 6CO (1200K) TiO2 + 3C → TiC + 2CO (600K) TiC +2Cl2 → TiCl4 + C (600K) TiCl4 + (2+n)H2O → TiO2 •nH2O + 4HCl If the ore is preroasted with coke around 1400K, some carbides are formed. 1.Separation of Ti and Zr 2.Fractional distillation of chlorides Add water to TiSO4 + ZrSO4 / 浓H2 SO4 → Zr(SO4 ) 2 •4H2O↓
@Alkalifusion2FeTiO, + 2Na0H +Na,0, → 2Na,TiO, + Fe,O3 +H,0TiO, +2NaOH → Na,TiO, +H,ONa,TiO, +H,SO -→ Na,SO + TiO,nH,O
19 ⑥ Alkali fusion 2FeTiO3 + 2NaOH +Na2O2 → 2Na2TiO3 + Fe2O3 +H2O TiO2 + 2NaOH → Na2TiO3 + H2O Na2TiO3 + H2 SO4 → Na2 SO4 + TiO2 •nH2O
(2)还原 Ti0, + Al → Ti + Al03 (2500K)C → Ti+CO② TiCl + Ca (Mg\Na) → Ti + CaCIThe metalis obtained in a powered formand is pyrophoric.阳： 2CI--2e= Cl,阴: TiF2-+ 4e= Ti+ 6F-
20 (2)还原 ① TiO2 + Al → Ti + Al2O3 (2500K) C → Ti + CO ② TiCl4 + Ca (Mg\Na) → Ti + CaCl The metal is obtained in a powered form and is pyrophoric. 阳：2Cl− −2e = Cl2 阴：TiF6 2− + 4e = Ti + 6F−