以煤矸石为铝源制备镁铝层状双金属氢氧化物

以煤矸石为铝源,经机械活化、热活化、酸浸提、制备了一水软铝石,再通过共沉淀法合成Mg-Al层状双金属氢氧化物.采用XRD、FT-IR和SEM等手段对合成样品进行分析和表征.结果表明:煤矸石在热活化温度为700 ℃、浸取温度为100 ℃、浸取时间为150 min、助溶剂/样品质量比为2∶10、硫酸浓度为4 mol/L、液固比为15∶1时,Al2O3浸取率为0.937.共沉淀法制备Mg-Al层状双金属氢氧化物在Mg与Al物质的量比为2∶1,pH值为10,反应温度为60 ℃时,得到层间距d(003)为0.798 nm的镁铝层状双金属氢氧化物.

Preparation of Mgnesia-Alumina Double-layered Metal Hydroxides with Coal Gangue as Aluminum Source

Obtained from coal gangue as raw matcrials of boehmite was through mechanical activation, thermal activation and acid extraction.Mg-Al layered double metal hydroxides(LDHs) was produced by co-precipitation method.The products were characterized by XRD,IR and scanning electron microscopy (SEM) measurements.Experimental results show that: Coal gangue is activated at the calcination temperature of 700 ℃, leaching temperature is 100 ℃, extraction time is 150 min,the quality ratio between solvent and sample is 2∶10,the concentration of sulfuric acid is 4 mol/L,the ratio between liquid and solid is 15∶1,the extraction rate of Al2O3 is 0.937.When the molar ratio of Mg and Al is 2∶1,pH is 10 and the reaction temperature is 60 ℃,Mg-Al layered double hydroxides with interlamellar spacing d(003) of 0.798 nm are prepared by co-precipitation method.