Influence mechanism of emulsion collector on the flotation effect of coal gasification fine slag

IF 7.2 2区 工程技术 Q1 CHEMISTRY, APPLIED
Panpan Fan , Wenwen Dai , Xiaoting Fan , Lianping Dong , Jiancheng Wang , Weiren Bao , Liping Chang , Minqiang Fan
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Abstract

Coal gasification slag (CGS) presents significant challenge to the green and low-carbon development of the coal gasification industry due to its limited utilization restriction. In this study, cationic surfactant DTAB was used with kerosene to formulate an emulsion collector. The flotation results showed that, the increase in collector dosage could significantly improve the combustible recovery. At an optimal collector dosage of 10 kg/t, an increased DTAB ratio could significantly diminish the ash content of flotation concentrates and improve flotation precision. Through flotation dynamics experiments and fitting of the Fuerstenau upgrading curve, it confirmed that the entrainment of fine-grained particles with high ash content is the primary contributor to high ash content in flotation concentrates. Combined with FTIR spectroscopy, XPS and other analysis method, it validated that the surfactant effectively reduced the dispersed particle size of the agent, the increased contact angle of RC surface also improved hydrophobicity and improved particles hydrophobic agglomeration strength. Molecular dynamics simulation further illuminated that the surfactant covered part of the hydrophilic sites on the residue carbon (RC) surface and influenced the electrostatic interaction. The research results have important theoretical significance for perfecting the flotation theory of CGFS.

乳化液捕收剂对煤气化细渣浮选效果的影响机理
煤气化炉渣(CGS)因其有限的利用限制,对煤气化行业的绿色低碳发展提出了重大挑战。本研究采用阳离子表面活性剂 DTAB 与煤油配制成乳液捕收剂。浮选结果表明,增加捕收剂用量可显著提高可燃物回收率。在最佳捕收剂用量为 10 kg/t 时,增加 DTAB 的配比可显著降低浮选精矿的灰分含量,提高浮选精度。通过浮选动力学实验和福尔斯滕瑙提升曲线拟合,证实高灰分细粒的夹带是造成浮选精矿高灰分的主要原因。结合傅立叶变换红外光谱、XPS 等分析方法,验证了表面活性剂有效降低了药剂的分散粒度,RC 表面接触角的增大也改善了疏水性,提高了颗粒的疏水团聚强度。分子动力学模拟进一步表明,表面活性剂覆盖了残炭(RC)表面的部分亲水位点,并影响了静电作用。该研究成果对完善 CGFS 的浮选理论具有重要的理论意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Fuel Processing Technology
Fuel Processing Technology 工程技术-工程:化工
CiteScore
13.20
自引率
9.30%
发文量
398
审稿时长
26 days
期刊介绍: Fuel Processing Technology (FPT) deals with the scientific and technological aspects of converting fossil and renewable resources to clean fuels, value-added chemicals, fuel-related advanced carbon materials and by-products. In addition to the traditional non-nuclear fossil fuels, biomass and wastes, papers on the integration of renewables such as solar and wind energy and energy storage into the fuel processing processes, as well as papers on the production and conversion of non-carbon-containing fuels such as hydrogen and ammonia, are also welcome. While chemical conversion is emphasized, papers on advanced physical conversion processes are also considered for publication in FPT. Papers on the fundamental aspects of fuel structure and properties will also be considered.
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