SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Lu Ye,Yangcheng Lu
With the depletion of rich fluorite ore, flotation process suitable for fine-grained fluorite is of great necessity. In this study, such method was preliminarily developed with a combination of in-situ surface modification and gas-liquid microdispersion. By introducing additives into ball-milling, the interaction between reagents and particles was improved. Through exploitation of selective sedimentation of undesired minerals via pH adjustment, the flotation of fine-grained fluorite was achieved with little or even no depressant in this study. Using a well-designed membrane dispersion device, effective interaction between the particles and bubbles was achieved, with massive expansion of the surface area in a limited space, enabling continuous flotation in a miniaturized device. Satisfactory product grade and recovery were obtained while reducing the use of additives, along with significantly decreased costs related to energy consumption, wastewater and flue gas treatment, and facility investments. The mechanism of this flotation separation strategy was summarized on the basis of empirical data. The strategy was effectively and flexibly applied to fluorite ores with different particle sizes and surface properties.
研究领域:
矿物加工工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Qichen Shang,Yu Chang,Junjie Wang,Daiwei Gu,Jian Deng,Guangsheng Luo
Countercurrent extraction with extreme phase ratio widely exists in many fields. However, it remains a great challenge for its low efficiency because of poor dispersion and unstable two-phase flow. In this work, we take the extraction of H 2 O 2 from the working solution as an example and develop a novel intensification technology via integrating the annual rotating flow with micro-capillary jetting dispersion. The phase whose volume flow rate is much smaller is ejected into the continuous phase by micro-capillary jetting to form microdroplets. The annular rotating field is introduced to stabilize the flow and reduce the extraction resistance. The microdispersion, two-phase countercurrent flow, and extraction characteristics are systematically studied. The results show that three theoretical stages in 60 cm with an operation capacity of 43.6 m 3 /(m 2 ·h) are successfully achieved when the phase ratio exceeds 50. This new technology may become a general way for extraction intensification with the extreme phase ratio.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2020
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IF 3.871
Ya-Ni Ji,Wen-Jie Geng,Chun-Yang Ma,Jing Tan,Wen-Sheng Deng,Bin Liu,Yue-Feng Su
A simple and effective method was conducted for preparing microdispersed droplets with decreased size and increased uniformity, in which phase inversion in high-phase-ratio liquid/liquid system was combined with addition of microbubbles. Five typical flow patterns were observed, including W/O, O/W/O, transition regime, O/W and G/W/O regimes. Flow regime transition was observed, according to which physical properties of systems and operating conditions for preparing single-oil-droplet-in-water emulsion were determined in different liquid/liquid and gas/liquid/liquid modes. Effects of liquid viscosities as well as interfacial tension on droplet size ( D O ) and its standard deviation (SD) were studied systematically and the most effective gas/liquid/liquid mode was recommended. Mathematical models were established for correlating D O in five different modes, which show relatively good agreement with experimental results. D O decreases by 42% via introducing phase inversion and further reduces to 25% by addition of microbubbles, both under the same operating conditions.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
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IF 3.375
Yunpeng Hu,Kai Wang,Chunli Han,Tao Wang,Guangsheng Luo
A novel liquid–liquid microdispersion method for the synthesis of TS-1 has been developed by continuous preparation of the precursor. In the novel process, the solution of TBOT in n-hexane could be very uniformly dispersed into the oligomeric silicate prehydrolysis mixture to form microdroplets by a microsieve pore reactor. Due to the fast mixing and very high mass transfer performance of the microdispersion process, the Ti species could be uniformly distributed into the mixture and were more likely to condense into the oligomeric silicate precursor species rather than appear with self-condensation. The prepared samples had a minimum molar ratio of Si/Ti at 51 without extra-framework Ti species. Furthermore, the solvent of n-hexane can be recycled by simple phase separation rather than evaporation under the conditions of using isopropanol, which reduced energy consumption. This continuous microdispersion technology could be controllable and a reliable scaling-up for the preparation of TS-1.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Yuchao Chen,Yubin Wang,Zifei Yan,Jian Deng,Guangsheng Luo
Efficient selective removal of H 2 S over CO 2 is the critical absorption process for the gas desulfurization in the petrochemical and refining industries. In this work, we tried to achieve high-selective removal of H 2 S from a mixed gas with CO 2 using a nonaqueous methyldiethanolamine solution in a membrane gas–liquid microdispersion microreactor. The influence of structural parameters and operation parameters on the removal efficiency of H 2 S and CO 2 were systematically investigated. In addition, the mechanism of selective absorption H 2 S over CO 2 was explained in detail. Furthermore, the selective absorption performance of the membrane microdispersion microreactor was compared with other devices. The results showed that the H 2 S removal efficiency and selective factor could be up to 99.4 % and 16.6, respectively. The selectivity factor of H 2 S to CO 2 in the membrane microdispersion microreactor is higher than that of most of reported devices. This work provides a promising selective absorption H 2 S device and technology for the process intensification of gas desulfurization.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）