抑制剂羟乙基磷酸四钠在水镁石与白云石浮选分离中的选择性吸附作用研究
Flotation separation of dolomite and brucite via selective adsorption of the inhibitor tetrasodium hydroxyethylphosphate
宫秀峰 1姚金 1杨斌 2印万忠 1付亚峰 3王余莲4
作者信息
- 1. School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China
- 2. School of Chemical Engineering,China University of Mining and Technology,Xuzhou 221116,China
- 3. Ansteel Beijing Research Institute Co.,Ltd.,Beijing 102200,China
- 4. School of Materials Science and Engineering,Shenyang Ligong University,Shenyang 110159,China
- 折叠
摘要
本研究以十二烷基磺酸钠为捕收剂、羟乙基磷酸四钠为抑制剂,开展了水镁石与白云石的浮选分离试验.微浮选试验表明,在羟乙基磷酸四钠作用下,白云石的可浮性大幅下降,水镁石可浮性略有降低,两种矿物的可浮性差异显著;其中,在十二烷基磺酸钠浓度为30 mg/L、羟乙基磷酸四钠浓度为100 mg/L时,水镁石和白云石单矿物取得了73.91%的最大浮游差,同时白云石的浮选回收率仅为11.98%.接触角与动电位分析表明,羟乙基磷酸四钠选择性显著降低白云石的润湿性与荷电性,轻微影响水镁石的润湿性与可浮性.红外光谱分析表明,羟乙基磷酸四钠在白云石表面吸附强烈,它存在时十二烷基磺酸钠在白云石表面的吸附能力很弱;但羟乙基磷酸四钠在水镁石表面的吸附能力较弱,无法影响十二烷基磺酸钠在水镁石表面的吸附.X射线光电子能谱分析表明,羟乙基磷酸四钠选择性地与白云石表面暴露的Ca位点结合,进而阻碍了十二烷基磺酸钠对白云石吸附,使白云石的可浮性处于较差的状态.
Abstract
Herein,the flotation separation of dolomite and brucite was performed using tetrasodium hydroxyethylphosphate(TH)as the inhibitor.Microflotation tests show that for a sodium dodecyl sulfonate(SDS)concentration of 30 mg/L,100 mg/L of TH can achieve the maximum flotation separation of 73.91%between brucite and dolomite.Moreover,the flotation recovery of dolomite is selectively reduced by a considerable amount.Detection results show that the wettability and charge of dolomite are higher than those of brucite owing to the selective adsorption of TH.Moreover,on the dolomite surface,the strong adsorption of TH interferes with SDS adsorption.Additionally,TH selectively binds to the exposed Ca sites on the dolomite surface,hindering SDS adsorption and resulting in poor dolomite floatability.The selective adsorption of TH on the dolomite surface enhances the flotation separation of dolomite and brucite.
关键词
水镁石/白云石/羟乙基磷酸四钠/选择性吸附/浮选分离Key words
brucite/dolomite/tetrasodium hydroxyethylphosphate/preferential adsorption/flotation separation引用本文复制引用
基金项目
National Key R&D Project of China(2021YFC2902400)
General Program of the National Natural Science Foundation of China(51974064)
General Program of the National Natural Science Foundation of China(52174239)
出版年
2023
NETL
NSTL
维普
万方数据