二次铝灰脱氮制备铝酸钙的实验研究  

Experimental research on the preparation of calcium aluminate by denitrification of secondary aluminum dross

作　　者：乔晨阳 陈喜平 虎兴茂 Qiao Chenyang;Chen Xiping;HuXingmao(School of Material Science and Engineering,Zhengzhou University,Zhengzhou 450001,China;National and Local Joint Engineering Research Center for Green Mineral Metallurgy and Processing,Zhengzhou 450001,China;Ningxia Energy Aluminum Technology Engineering Co.,Ltd.of State Power Investment Group,Qingtongxia 751603,China)

机构地区：[1]郑州大学材料科学与工程学院,河南郑州450001 [2]绿色选冶与加工国家地方联合工程研究中心,河南郑州450001 [3]国家电投集团宁夏能源铝业科技工程有限公司,宁夏青铜峡751603

出　　处：《轻金属》2024年第5期9-15,46,共8页Light Metals

基　　金：郑州大学科研发展基金项目(25124510001);成果转化项目:茂名石化实华股份有限公司铝工业危废产品化利用(25120230006B)。

摘　　要：铝及铝材熔铸过程产生的铝灰中含有大量氧化铝,是重要的二次含铝资源。作为铝工业的危险固体废弃物,铝灰可以转化为价值较高的铝酸钙、氢氧化铝等产品。本文以二次铝灰为原料、碳酸钙为药剂制备铝酸钙,探讨了钙铝比、保温时间及焙烧温度对铝酸钙制备工艺的影响,结果表明:在钙铝比1.1~1.2,保温时间1.25~1.5 h,焙烧温度1150~1200℃的条件下,产物中C_(12)A_7的质量分数较高。各因素影响的次序是:钙铝比的影响显著,保温时间次之,焙烧温度最弱。在钙铝比1.2、保温时间1.5 h、焙烧温度1150℃的条件下制备了铝酸钙,产品中C_(12)A_7的质量分数为75.1%,含少量镁铝尖晶石和硅酸盐。初步探讨了二次铝灰中氧化铝和碳酸钙的固-固反应机理。The aluminum dross produced during the melting and casting process of aluminum and aluminum materials contains a large amount of alumina,which is an important secondary aluminum-containing resource.As a hazardous solid waste in the aluminum industry,aluminum dross can be converted into higher value products such as calcium aluminate and aluminum hydroxide.This paper utilizes secondary aluminum dross as raw material and calcium carbonate as a reagent to prepare calcium aluminate,investigating the influence of the calcium-to-aluminum mass ratio,holding time and baking temperature on the preparation process of calcium aluminate.The results show that when the calcium-to-aluminum mass ratio is 1.1~1.2,the holding time is 1.25~1.5 h and the baking temperature is 1150~1200℃,the mass fraction of C_(12)A_7 in the product is relatively high.The order of influence of various factors is that the calcium-to-aluminum mass ratio has a significant impact,followed by holding time,with baking temperature having the weakest effect.Under the conditions of a calcium-to-aluminum mass ratio of 1.2,holding time of 1.5 h and baking temperature of 1150℃,calcium aluminate is prepared.The mass fraction of C_(12)A_7 in the product is 75.1%,with a small amount of magnesia-aluminum spinel and silicate.The solid-solid reaction mechanism of aluminum oxide and calcium carbonate in secondary aluminum dross is preliminarily discussed.

关 键 词：二次铝灰 铝酸钙 钙铝比 焙烧 

分 类 号：TF821[冶金工程—有色金属冶金]