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在对某高铁三水铝石型铝土矿物相分析基础上,研究了其在不加钙的铝酸钠溶液中的溶出行为,考察了溶出液碱浓度、溶出温度和溶出时间对氧化铝溶出率的影响.结果表明,矿中Gibbsite形态的铝约占总铝量的70%,且嵌布于赤铁矿中;优化的溶出条件为,分子比3.0的铝酸钠溶液Na2O浓度为150 g/L、温度100℃、时间15 min,此时原矿中Al2O3溶出率达72%.该矿在低温低碱条件下的溶出过程受内扩散控制,计算的表观活化能为61.78 kJ/mol,溶出速率控制模式与表观活化能理论值不同可能与扩散形式相关.
Based on the phase analysis of a high-speed gibbsite-type bauxite, its dissolution behavior in calcium aluminate-free sodium aluminate solution was studied. The effects of alkali concentration, dissolution temperature and dissolution time on the dissolution of alumina The results show that the Gibbsite morphology in the ore accounts for about 70% of the total aluminum content and is embedded in the hematite. The optimal dissolution conditions are that the sodium aluminate solution with a molecular ratio of 3.0 has a Na2O concentration of 150 g / L, the temperature is 100 ℃, the time is 15 min, and the dissolution rate of Al2O3 in the ore reaches 72% at this time.The dissolution process of the ore under low temperature and low alkali is controlled by internal diffusion, the calculated apparent activation energy is 61.78 kJ / mol The difference between the dissolution rate control mode and the apparent activation energy theoretical value may be related to the diffusion mode.