摘要
采用矿物组成改性技术活化粉煤灰中的氧化铝;消除阻止硅酸二钙(2CaO.S iO2)晶相转变的干扰因素,实现了粉煤灰活化烧结料100%的自粉化,自粉化料平均粒径小于1μm;用质量分数8%的碳酸钠溶液可从活化粉煤灰中以铝酸钠形式提取铝组分,用高效复合分散剂采用碳化法制备超细氢氧化铝,煅烧氢氧化铝可得到平均粒度小于200 nm的氧化铝。该方法为粉煤灰的高价值利用开辟了一条新的途径。
Modification of mineral composition is adopted to activate the alumina in the flyash;Disturbing factors of crystal change of 2CaO · SiO2 are eliminated effectively and the complete self - pulverization of flyash sinter is realized and the average diameter of powders is less than 1 μm ;The aluminum in the form of NaAlO2 from the activated flyash is extracted by 8% sodium carbonate solution and then the ultrafine powders aluminum hydroxide is prepared by carbonization method with high effective dispersant, after calcining the aluminum hydroxide, the alumina with average diameter of 200 nm is obtained. This method is a new way for the utilization of flyash with high value added.
出处
《无机盐工业》
CAS
北大核心
2005年第12期47-49,共3页
Inorganic Chemicals Industry
关键词
粉煤灰
晶相转变
自粉化料
氧化铝
flyash
crystal change
self - pulverized feed
alumina
