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以分析纯CaCO_3,Al_2O_3和Na_2CO_3为原料,在1100~1250℃合成了Na_4Ca_3(AlO_2)_(10),研究了浸出时间、浸出温度、液固比及溶液中碳酸钠和氢氧化钠浓度对Na_4Ca_3(AlO_2)_(10)浸出性能的影响.结果表明,在1200℃烧结30 min,可以合成纯度高于90%的Na_4Ca_3(AlO_2)_(10).当碳酸钠浓度为80 g/L、氢氧化钠浓度18 g/L时,Na_4Ca_3(AlO_2)(10)在40℃浸出10 min的氧化铝浸出率达到90%以上.当碳酸钠浓度降为30 g/L时,Na_4Ca_3(AlO_2)_(10)在60℃浸出15 min的氧化铝浸出率大于85%.浸出时添加氢氧化钠有利于氧化铝浸出率的提高,氢氧化钠浓度大于5 g/L时,氧化铝浸出率可提高10%以上.Na_4Ca_3(AlO_2)10的浸出性能优于12CaO·Al_2O_3和CaO·Al_2O_3.
Na_4Ca_3 (AlO_2) _ (10) was synthesized from pure CaCO_3, Al_2O_3 and Na_2CO_3 at 1100-1250 ℃. The effects of leaching time, extraction temperature, liquid-solid ratio and the concentration of sodium carbonate and sodium hydroxide in solution on the activity of Na_4Ca_3 (AlO_2) _ (10) .The results showed that Na_4Ca_3 (AlO_2) _ (10) with purity higher than 90% can be synthesized by sintering at 1200 ℃ for 30 min.When the concentration of sodium carbonate is 80 g / L, When the concentration of sodium carbonate is 18 g / L, the leaching rate of alumina in Na 4 Ca 3 (AlO 2) (10) leached at 40 ℃ for 10 min reaches more than 90%. When the concentration of sodium carbonate is reduced to 30 g / L, Na_4Ca_3 (AlO_2) 10) Alumina leaching rate more than 85% leached for 15 min at 60 ℃ Adding sodium hydroxide during leaching is beneficial to the improvement of alumina leaching rate, and when the concentration of sodium hydroxide is more than 5 g / L, the leaching rate of alumina can be increased by 10 %, And the leaching performance of Na_4Ca_3 (AlO_2) 10 is better than that of 12CaO · Al_2O_3 and CaO_Al_2O_3.