Furnace smelting and extractive metallurgy of red mud: Recovery of TiO2, Al2O3 and pig iron

Ercag E., Apak R.

JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY, cilt.70, sa.3, ss.241-246, 1997 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 70 Sayı: 3
  • Basım Tarihi: 1997
  • Dergi Adı: JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.241-246
  • İstanbul Üniversitesi Adresli: Evet

Özet

Turkish red mud (bauxite waste) has been mixed with dolomite and coke, pelletized and sintered at 1100 degrees C, and finally smelted at 1550 degrees C to produce pig iron and a slag. The slag was leached with 30% H2SO4 at 90 degrees C. The leachate was diluted, ferric iron was reduced with SO2, and extracted with 5% D2EHPA solution in kerosene. Silica and Al2O3 were recovered from the remaining aqueous solution, while the organic extract was stripped with 10% Na2CO3 solution, finally hydrolysed and calcined to produce pigment-grade TiO2. The titanium recovery efficiency on the basis of slag weight was 84.7%. The extractive separation of titanium from both valencies of iron was investigated as a function of pH and time. A stoichiometric flowsheet for the whole process has been developed.