李凤华1,
胡恩柱1
1.东北大学冶金学院， 沈阳 110819
基金项目: 辽宁省自然科学基金资助项目（201602250）
中央高校基本科研业务专项资金资助（N172504021）
CO2 sequestration by red mud under coupling effect of ultrasonic wave and mechanical agitation
NAN Xiangli1,,LI Fenghua1,
HU Enzhu1
1.School of Metallurgy, Northeastern University, Shenyang 110819, China
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摘要:以拜耳法赤泥为二氧化碳（CO2）固化剂，提出了基于超声波机械搅拌耦合作用下赤泥吸收二氧化碳的新思路，以期实现“以废治废”、行业气固两类废弃物得到高效综合利用的目标。以拜耳赤泥吸收低浓度二氧化硫的前期研究为基础，自行设计了超声波与机械搅拌耦合作用的鼓泡反应器，利用其“空化作用”与机械搅拌的耦合作用促进赤泥对低浓度二氧化碳的高效吸收。考察了在焙烧条件、温度、搅拌桨转速、液固比、气体流量、超声波功率对赤泥吸收二氧化碳的影响规律，得到最优条件，焙烧后可以大大提高赤泥对CO2的固定能力，单独机械搅拌作用下，赤泥吸收CO2适宜的条件为：反应温度25 ℃、气体流量0.025 m3·h-1、液固比为6:1和搅拌转速150 r·min-1，此时最大固碳量为71.72 g·kg-1，加入超声波后固碳效果进一步提高，最佳超声波功率为600 W。
关键词: 赤泥/
二氧化碳/
超声波/
耦合作用
Abstract:In this study, a new clue of CO2 absorption by red mud based on the coupling effect of ultrasonic wave and mechanical agitation was proposed, aiming to "treat waste with waste" and efficiently utilize gas-solid industrial wastes. Based on the previous experiments of low concentration SO2 absorption by Bayer red mud, a bubbling reactor with the coupling effect of ultrasonic wave (or cavitation) and mechanical agitation was designed, which accelerated the low-concentration CO2 absorption by red mud. The effects of roasting conditions, temperature, rotating speed of stirring paddle, liquid-to-solid ratio, gas flow rate, and ultrasonic power on the CO2 absorption by red mud were studied. The CO2 sequestration by red mud could be largely improved at the obtained optimal roasting conditions. Under mechanical agitation alone, the optimal red-mud-based CO2 absorption conditions were reaction temperature of 25 oC, gas flow rate of 0.025 m3·h-1, liquid-to-solid ratio of 6:1, and agitation speed of 150 r·min-1. The corresponding maximum carbon sequestration was 71.72 g·kg-1. As ultrasonic waves was combined with mechanical agitation, the carbon sequestration was further improved, and the optimal ultrasonic power was 600 W.
Key words:red mud/
carbon dioxide/
ultrasonic/
coupling effect.
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基于超声波机械搅拌耦合作用下赤泥对二氧化碳的固化封存
南相莉1,,李凤华1,
胡恩柱1
1.东北大学冶金学院， 沈阳 110819
基金项目: 辽宁省自然科学基金资助项目（201602250） 中央高校基本科研业务专项资金资助（N172504021）
关键词: 赤泥/
二氧化碳/
超声波/
耦合作用
摘要:以拜耳法赤泥为二氧化碳（CO2）固化剂，提出了基于超声波机械搅拌耦合作用下赤泥吸收二氧化碳的新思路，以期实现“以废治废”、行业气固两类废弃物得到高效综合利用的目标。以拜耳赤泥吸收低浓度二氧化硫的前期研究为基础，自行设计了超声波与机械搅拌耦合作用的鼓泡反应器，利用其“空化作用”与机械搅拌的耦合作用促进赤泥对低浓度二氧化碳的高效吸收。考察了在焙烧条件、温度、搅拌桨转速、液固比、气体流量、超声波功率对赤泥吸收二氧化碳的影响规律，得到最优条件，焙烧后可以大大提高赤泥对CO2的固定能力，单独机械搅拌作用下，赤泥吸收CO2适宜的条件为：反应温度25 ℃、气体流量0.025 m3·h-1、液固比为6:1和搅拌转速150 r·min-1，此时最大固碳量为71.72 g·kg-1，加入超声波后固碳效果进一步提高，最佳超声波功率为600 W。
English Abstract
CO2 sequestration by red mud under coupling effect of ultrasonic wave and mechanical agitation
NAN Xiangli1,,LI Fenghua1,
HU Enzhu1
1.School of Metallurgy, Northeastern University, Shenyang 110819, China
Keywords: red mud/
carbon dioxide/
ultrasonic/
coupling effect
Abstract:In this study, a new clue of CO2 absorption by red mud based on the coupling effect of ultrasonic wave and mechanical agitation was proposed, aiming to "treat waste with waste" and efficiently utilize gas-solid industrial wastes. Based on the previous experiments of low concentration SO2 absorption by Bayer red mud, a bubbling reactor with the coupling effect of ultrasonic wave (or cavitation) and mechanical agitation was designed, which accelerated the low-concentration CO2 absorption by red mud. The effects of roasting conditions, temperature, rotating speed of stirring paddle, liquid-to-solid ratio, gas flow rate, and ultrasonic power on the CO2 absorption by red mud were studied. The CO2 sequestration by red mud could be largely improved at the obtained optimal roasting conditions. Under mechanical agitation alone, the optimal red-mud-based CO2 absorption conditions were reaction temperature of 25 oC, gas flow rate of 0.025 m3·h-1, liquid-to-solid ratio of 6:1, and agitation speed of 150 r·min-1. The corresponding maximum carbon sequestration was 71.72 g·kg-1. As ultrasonic waves was combined with mechanical agitation, the carbon sequestration was further improved, and the optimal ultrasonic power was 600 W.
