【摘要】 以富铝废渣为原料,利用新型分散剂制备出粒径小于100 nm的疏松无团聚氢氧化铝超细粉体。采用矿物改性活化富铝废渣中的A l2O3,消除阻止C2S晶相转变的干扰因素,实现了富铝废渣活化烧结料100%的自粉化,用8%碳酸钠溶液从自粉化料中以NaA lO2形式提取铝组分。试验研究了碳化过程中新型分散剂分子量、加入方式、加入量、铝酸钠溶液浓度对氢氧化铝超细粉体制备的影响,得出了最佳工艺参数。讨论了新型分散剂在制备氢氧化铝超细粉体过程中的分散机理。更多还原

【Abstract】 Loose and non-reunite ultra-fine powder of aluminum hydroxide with size less than 100nm are prepared from rich-alumina residues by using a new dispersant.Here modification of mineral composition is adopted to activate Al2O3 in rich-alumina residues.Disturbing factors of crystal change of C2S are eliminated effectively and the complete self-pulverization of rich-alumina residues sinter is realized.Aluminum in the form of NaAlO2 is extracted from the activated stuff by using 8% sodium carbonate solution.It is studied in experiments that the effects of the dispersant’s molecular weight,adding method,amount and the concentration of sodium aluminate solution on the preparation of ultra-fine aluminum hydroxide and the best technique parameters are achieved.The dispersion mechanism of the new dispersant during the preparation process is also discussed.更多还原