| Abstrakt: |
It is of great practical significance to comprehensively recover aluminum from the low-grade aluminum ore wet processing process to realize recycling or high value utilization of low-grade aluminum-containing minerals. The high aluminum and iron leaching solution obtained by sulfuric acid leaching of low-grade aluminum-containing anatase ore was used as the research object, and high-purity Al2O3 was prepared by Crystallization of ammonium aluminum sulfate--Removal of iron with resin adsorption--Calcination combined process. The results show that under the condition of initial concentration of aluminum ion of 0.70 mol/L, NH4+/Al3+ molar ratio of 1.2, crystallization end point temperature of 20 °C, and stirring speed of 300 r/min for 30min, NH4Al(SO4)2 ⋅ 12H2O crude product with a purity of 95.31% was obtained. The aluminum recovery rate was 88.19%, and the iron content was 1.39%. Then, the crude NH4Al(SO4)2 ⋅ 12H2O product was subjected to iron removal by two recrystallizations and primary resin adsorption, and finally calcined at 1 300 °C to obtain Al2O3 with a purity of 99.99%. [ABSTRACT FROM AUTHOR] |
