The progress of research and production of bauxite based homogenized grogs in China was summarized and the achievements of their application and modification in recent years were epitomized.In combination with the sho...The progress of research and production of bauxite based homogenized grogs in China was summarized and the achievements of their application and modification in recent years were epitomized.In combination with the shortcomings existing in the research,production and application,the suggestions of bauxite based homogenized grogs for future development were put forward.展开更多
Bauxite-based mullite grogs were prepared with grade 11 bauxite （ ≤ 3 mm ） and coal gangne （ ≤ 3 mm） as starting materials with formula of w （ Al2O3 ） = 68% - 72 %. Mill the mixture to particle size ≤ 0. 044 ...Bauxite-based mullite grogs were prepared with grade 11 bauxite （ ≤ 3 mm ） and coal gangne （ ≤ 3 mm） as starting materials with formula of w （ Al2O3 ） = 68% - 72 %. Mill the mixture to particle size ≤ 0. 044 mm by wet milling to homogenize chemical composition. After shaping by wet extrusion and drying, the materials were fired at 1 550℃, 1 600℃ and 1 700℃ for 6 hours respectively. After cooling apparent porosity and bulk density of fired materials were tested. The results show as follows： the appropriate sintering temperature for bauxite-based mullite with homogeneous and consistent composition and microstructure and properties is 1 600℃, at which the mullite has apparent porosity ≤ 1.5%, bulk density ≥ 2.81 g · cm^3 and refractoriness under load is 1 610-1 650 ℃. Compared with the laboratory results, the sintering temperature is lowered about 100℃ , bulk density increased 0. 06 g · cm^3. The industrial feasibility of preparing bauxite-based mullite grogs with the processing is confirmed.展开更多
文摘The progress of research and production of bauxite based homogenized grogs in China was summarized and the achievements of their application and modification in recent years were epitomized.In combination with the shortcomings existing in the research,production and application,the suggestions of bauxite based homogenized grogs for future development were put forward.
文摘Bauxite-based mullite grogs were prepared with grade 11 bauxite （ ≤ 3 mm ） and coal gangne （ ≤ 3 mm） as starting materials with formula of w （ Al2O3 ） = 68% - 72 %. Mill the mixture to particle size ≤ 0. 044 mm by wet milling to homogenize chemical composition. After shaping by wet extrusion and drying, the materials were fired at 1 550℃, 1 600℃ and 1 700℃ for 6 hours respectively. After cooling apparent porosity and bulk density of fired materials were tested. The results show as follows： the appropriate sintering temperature for bauxite-based mullite with homogeneous and consistent composition and microstructure and properties is 1 600℃, at which the mullite has apparent porosity ≤ 1.5%, bulk density ≥ 2.81 g · cm^3 and refractoriness under load is 1 610-1 650 ℃. Compared with the laboratory results, the sintering temperature is lowered about 100℃ , bulk density increased 0. 06 g · cm^3. The industrial feasibility of preparing bauxite-based mullite grogs with the processing is confirmed.
