含钛电炉熔分渣制备4A分子筛及其吸附性能

以含钛电炉熔分渣提钛后的水浸液为原料，采用常压回流法和水热法分别合成了4A分子筛.在控制硅铝比（n（SiO₂）/n（Al₂O₃）摩尔比）为2的条件下，系统探讨了水钠比（n（H₂O）/n（Na₂O）摩尔比）、反应时间和温度对合成4A分子筛物相和微观形貌的影响.当控制水钠比为80且反应时间为8 h时，采用常压回流法可以制备出尺寸均一且结晶完全的4A分子筛；而采用水热法在120℃条件下，3 h即可制备得到形状规则的4A分子筛.另外，探讨了水热法不同反应温度条件下制备的分子筛对硫酸铜溶液吸附性能的影响.结果表明：反应温度为120℃条件下合成的4A分子筛对铜离子的吸附效率最高，在150 min时其吸附率可达70%.

Synthesis of 4A molecular sieves from titanium-containing electric furnace molten slag and their adsorption properties

4A molecular sieves were successfully synthesized from the leaching solutions of fused titanium-containing electric furnace molten slag by using the reflux method and the hydrothermal method,respectively. The effects of H₂O/Na₂O mole ratio,reaction time,and temperature on the crystal phase and microstructure of 4A molecular sieves were systematically investigated when keeping the SiO₂/Al₂O₃ mole ratio at 2. It is indicated that a 4A molecular sieve with well crystallinity and uniform size can be obtained by using the reflux method when the H₂O/Na₂O mole ratio is controlled at 80 and the reaction time is 8 h. Meanwhile,by using the hydrothermal method,a 4A molecular sieve can also be successfully prepared when the reaction is controlled at 120℃ only for 3 h. The adsorption properties for Cu2+ by 4A molecular sieves obtained at different temperatures were studied. The optimum adsorption efficiency of 70% is gained for a 4A molecular sieve synthesized at 120℃ for 150 min.