磷石膏气-液-固吸附制备纳米碳酸钙  

Preparation of nano calcium carbonate by gas liquid solid adsorption of phosphogypsum

作　　者：周静 李锋 Zhou Jing;Li Feng(College of chemistry and chemical engineering,Qiannan nationality normal college,Guizhou Duyun 558000)

机构地区：[1]贵州省都匀市黔南民族师范学院化学化工学院,贵州都匀558000

出　　处：《云南化工》2020年第7期45-47,共3页Yunnan Chemical Technology

基　　金：贵州省科学技术厅项目(黔科合LH字[2015]7707)。

摘　　要：以磷石膏(PG)为原料,在气(CO2)-液(NH3·H2O)-固(PG)三相体系中反应结晶制备纳米碳酸钙。研究了温度、CO2流量和反应时间对碳酸钙粒径分布的影响。结果表明,当CO2流量为138~251mL/min时,在相应的温度下,可以得到平均粒径为86~104nm的PG衍生纳米CaCO3。研究表明,碳酸钙的粒径受温度、CO2流量和反应时间的相互影响。随着温度的升高和反应时间的严格控制,较低的CO2流量有利于纳米CaCO3颗粒的形成。此外,PG衍生的纳米CaO经10次煅烧-碳化循环后仍保持0.27g/g的CO2吸附能力,与商用纳米CaO相同。Nano CaCO3 was prepared from phosphogypsum(PG) through reactive crystallizationinthe gas(CO2)-liquid(NH3·H2O)-solid(PG) three-phase system.The effects of temperature,CO2 flow rate and reaction time on CaCO3 particle size distribution(PSD) were investigated.The results show that PG-derived nano CaCO3 with an average particle diameter of 86-104 nm can be attained under a 251-138 m L/min CO2 flow rate at a corresponding temperature of 30-40°C.Research indicates that CaCO3 particle size is subjected to the mutual influence of temperature,CO2 flow rate and reaction time.A relatively low CO2 flow rate with increasing temperature and strictly controlled reaction time is advantageous to the formation of nano-sized CaCO3 grains.Additionally,PG-derived nano CaO maintains 0.27 g-CO2/g-CaO CO2 sorption capacity after 10 calcination-carbonation cycles,which is the same as for commercial nano CaO.

关 键 词：磷石膏 二氧化碳 碳酸钙 反应结晶 纳米材料 吸附剂 

分 类 号：TQ427.26[化学工程]