摘要
通过浓缩海水吸收CO_2制备了一种以碳酸镁为主要矿物组成的新型碳负性镁基水泥,着重研究Mg∶CO_2摩尔比、固碳反应温度及活化温度对碳负性镁基水泥产物及性能的影响。结果表明:浓缩海水中的Ca和Mg离子可通过调整p H值实现完全分离;固碳反应温度为45℃时,Mg∶CO_2摩尔比为1. 5和1. 8时,形成的主要产物为介稳镁基物质,MgCO_3·3H_2O;当Mg∶CO_2摩尔比为2. 0时,固碳反应温度低于45℃时,反应产物主要为介稳镁基物质,MgCO_3·3H_2O;当活化温度控制在300℃以内时,碳负性镁基水泥的活化反应主要是由于结晶水的失去。该新型碳负性镁基水泥具有显著的碳吸附和低碳排放特点。
A new carbon-negative Mg-based cement,mainly consisting of x MgCO3·y Mg(OH)2·zH2O,was prepared by the CO2 mineralization using concentrated brine.The key factors of preparation and performance on the carbon-negative Mg-based cement was investigated,that is molar ratio of Mg∶CO2,CO2 mineralization temperature,activation temperature.The results show that Ca and Mg ions in the concentrated brine can be completely separated by adjusting the pH;when the CO2 mineralization temperature is 45℃,the main product at the molar ratio of Mg∶CO2 as 1.5 and 1.8 is the metastable Mg-based material,MgCO3·3H2O.When the molar ratio of Mg∶CO2 is 2.0,the main product at the CO2 mineralization temperature lower than 45℃is the metastable Mg-based material,MgCO3·3H2O;when the activation temperature is lower than 300℃,activation reaction of the new magnesium-based cement mainly results from the loss of crystal water.The new carbon-negative Mg-based cement has the features of carbon capture due to its low calcium characteristic.
作者
刘姚君
汪澜
LIU Yao-jun;WANG Lan(State Key Laboratory of Green Building Materials,China Building Materials Academy,Beijing 100024,China)
出处
《硅酸盐通报》
CAS
北大核心
2019年第1期155-159,166,共6页
Bulletin of the Chinese Ceramic Society
基金
国家科技基础性工作专项(2014FY110900)
