Kinetic analysis about the CO₂ capture capacity of lime mud from paper mill in calcium looping process

Abstract

Large amount of industrial wastes are discharged from commercial production every year. 1 Lime mud is a kind of industrial waste that produced during the causticization process in paper mill. China is one of the papermaking and paper consumption powerhouses. In China, about 50 million tons of paper was produced every year, which means dozens of million tons of lime mud were discharged to the environment. The discharge of such a large amount of lime mud leads to serious environmental aspects including water pollution and land occupation. 2 Therefore, how to recycle the lime mud in environmentally friendly ways is an interesting topic and has drawn lots of researchers' attentions. Lime mud was firstly recovered as soil amendments and building materials. 3 Qin et al 4 have proved that recycling of lime mud as raw materials of anorthite ceramic was a feasible approach to solve the solid wastes. Madrid et al 5 successfully reused lime mud to produce concrete masonry units that with better thermal properties. In recent years,

Review on the modifications of natural and industrial waste CaO based sorbent of calcium looping with enhanced CO2 capture capacity

“…LM can achieve the highest carbonation conversion when carbonated at 700 °C, but the carbonation conversions decrease with the increase in calcination temperature from 850 °C to 1000 °C [ 92 ]. Moreover, LM exhibits lower carbonation conversion than limestone due to the chlorine content in the lime mud [ 92 , 93 ]. The increase in chlorine content causes a decrease in pore volume and surface area by 71.3% and 44.5%, respectively, and limits the CO 2 diffusion and carbonation reaction during carbonation.…”

“…The increase in chlorine content causes a decrease in pore volume and surface area by 71.3% and 44.5%, respectively, and limits the CO 2 diffusion and carbonation reaction during carbonation. Thus, the pre-washed process of LM can remove the chlorine during the preparation of sorbent and enhance the CO 2 capture capacity [ 93 ]. However, LM still demonstrates slow carbonation rate during chemical reaction stages and high carbonation rate during solid diffusion-controlled stages.…”

Solution combustion synthesis of MgO-stabilized CaO sorbents using polyethylene glycol as fuel and dispersant

“…A key advantage of CLP over other CO 2 capture technologies is the utilization of natural limestone or dolomite which have low costs, widespread availability and nontoxicity to the environment. 4 Industrial solid wastes such as carbide slag 5 and lime mud 6 were also proposed as CO 2 sorbents. Therefore, CLP was considered as one of the most promising technologies to reach large scale CO 2 emission reduction from coal-red power plants.…”