以电石渣为原料生产食品级轻质碳酸钙的绿色新工艺
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摘要
以电石渣为原料生产轻质碳酸钙过程中,首先将电石渣用氯化铵溶液进行浸取反应,制得CaCl2-NH3·H2O溶液;然后用CO2进行碳化反应以制得轻质碳酸钙。由于CaCl2-NH3·H2O体系的碱性明显弱于石灰乳体系,不利于在碳化初期形成大量晶核,不利于生产纳米级轻质碳酸钙,却有利于生产食品级轻质碳酸钙。提出了以电石渣和工业上富余的CO2为原料,生产食品级轻质碳酸钙为主、生产水泥原料为辅的联合生产绿色新工艺,实现了以废制废、变废为资源的循环经济目标,具有良好的环境效益、社会效益和经济效益。
In the process of producing light calcium carbonate from carbide slag,Ca Cl2-NH3·H2 O solution is firstly obtained by leaching carbide slag with ammonium chloride solution,and then carbonation reaction takes place between Ca Cl2-NH3·H2 O solution and CO2 to produce light calcium carbonate.Because the alkalinity of Ca Cl2-NH3·H2 O system is obviously weaker than the lime slurry system,it is not conducive to the formation of a large number of crystal nuclei at the early stage of carbonization,which is not conducive to the production of nanoscale light calcium carbonate,but is beneficial to the production of food grade light calcium carbonate.A new and green process based on calcium carbide slag and CO2,which is used as raw materials for the production of light calcium carbonate in food grade,is developed,which also produces cement raw material as by-product.It can realize the recycling economy target with wastes as resources and has good environmental,social and economic benefits.
In the process of producing light calcium carbonate from carbide slag,Ca Cl2-NH3·H2 O solution is firstly obtained by leaching carbide slag with ammonium chloride solution,and then carbonation reaction takes place between Ca Cl2-NH3·H2 O solution and CO2 to produce light calcium carbonate.Because the alkalinity of Ca Cl2-NH3·H2 O system is obviously weaker than the lime slurry system,it is not conducive to the formation of a large number of crystal nuclei at the early stage of carbonization,which is not conducive to the production of nanoscale light calcium carbonate,but is beneficial to the production of food grade light calcium carbonate.A new and green process based on calcium carbide slag and CO2,which is used as raw materials for the production of light calcium carbonate in food grade,is developed,which also produces cement raw material as by-product.It can realize the recycling economy target with wastes as resources and has good environmental,social and economic benefits.
引文
[1]颜鑫,卢云峰.轻质系列碳酸钙关键技术[M].北京:化学工业出版社,2016.
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[2]徐勤政,张宗彩,李文平,等.电石渣制备碳酸钙的研究及应用[J].硅酸盐通报,2017,36(S1):219-223.
[3]冯冬梅,刘渊,汤升亮,等.电石渣制备轻质碳酸钙循环工艺条件的优化[J].现代化工,2014,34(5):117-121.
[4]刘润静,李锐,胡永琪,等.电石渣和烟道气为原料生产碳酸钙[J].无机盐工业,2013,45(2):50-52.
[5]王超,杨保俊,周金刚,等.由电石渣制备高分散纳米碳酸钙[J].化工进展,2017,36(S1):346-352.
[6]郭琳琳,徐美,刘博静,等.氯化铵浸取电石渣制备碳酸钙研究[J].应用化工,2017,46(9):1757-1760.
[7]梁博,韩凤兰.电石渣制备碳酸钙微粉的晶型转变[J].无机盐工业,2016,48(10):63-67.
[8]张爱华,朱敏,关云山,等.氯化铵处理电石渣制备纳米碳酸钙的实验研究[J].科学技术与工程,2013,13(10):2880-2883.
[9]颜鑫,卢云峰,刘跃进.一种生产纳米碳酸钙的碳化活化一体化装置及方法:CN,201610409055.7[P].2017-09-05.
[10]颜鑫,邓新云,欧阳楚理,等.纳米碳酸钙碳化过程中“四膜模型”的研究[J].化学世界,2011,52(12):716-719.