摘要
研究了由富锰渣制备锰的过程中产生的硅铝废渣(酸浸渣)制备4A分子筛的工艺。以浓硫酸为浸取介质,将富锰渣中锰、铁、钙、镁等可溶性物质溶出,过滤所得固相酸浸渣在反应釜器中150℃、0.4MPa下与碱反应将硅铝溶出,以分析纯Al(OH)3为铝源,补铝调整比例到4A分子筛合适的硅/铝比,使溶液中各物质摩尔比为SiO2/Al2O3≈2,H2O/Na2O≈28,Na2O/SiO2≈0.9。浓缩溶液至过饱和状态,加入EDTA。将过饱和状态的溶液在90℃恒温5h左右,加入NaCl少许,放冷使之结晶。过滤并洗涤晶体至pH值至9～10,在烘箱中105℃干燥,于马弗炉中500℃左右煅烧1h脱水,即得4A分子筛产品。研究了EDTA对结晶母液中有色离子的络合效果,结果表明对Fe3+有一定去除效果。由XRD分析,产品主要成分为4A分子筛,但还有杂晶。
We have prepared 4A molecular sieves in hydrothermal environmental from rich-manganese slag. The richmanganese slag can be directly lixiviated to prepare manganese sulfate without deoxidization,and the matter after lixiviation we used to prepare 4A molecular sieves as it＇s main components are SiO2 and Al2O3. The feasible conditions of alkali reaction, crystallization,temperature removing Fe^3＋ are studied in finally. It＇s feasible to use rich-manganese slag to prepare 4A molecular sieves
出处
《安徽化工》
CAS
2008年第3期27-29,共3页
Anhui Chemical Industry
关键词
富锰渣
酸浸
水热
EDTA
4A分子筛
rich-manganese slag
lixiviate
hydrothermal
EDTA
4A molecular sieves
