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Effect of Tween 80 on flotation separation of magnesite and dolomite using NaOL as the collector
Journal of Molecular Liquids ( IF 6 ) Pub Date : 2020-06-30 , DOI: 10.1016/j.molliq.2020.113712
Wenhan Sun , Wengang Liu , Shujuan Dai , Ting Yang , Hao Duan , Wenbao Liu

Dolomite is difficult to be separated from magnesite by sodium oleate (NaOL) because of their same crystal structure, similar chemical composition, and high solubility. The work investigated the effect of Tween 80 as the accessory reagent on the flotation of magnesite and dolomite using NaOL as the collector by flotation tests, solution chemical calculations, surface tension measurements, Zeta potential measurements, contact angle measurements, FTIR spectra measurements, and XPS measurements. Flotation experiments and contact angle analysis showed that the addition of Tween 80 strengthened the floatability of magnesite and weakened that of dolomite when NaOL was used as a collector. Surface tension analysis, Zeta potential analysis, and FTIR spectra analysis revealed that Tween 80 could strengthen the adsorption of NaOL on mineral surface by promoting the dissolution and dispersion of NaOL solution. Solution chemical calculations, Zeta potential analysis, and FTIR spectra analysis also indicated that Ca2+ and CaOH+ were the active components of dolomite in flotation, and Tween 80 had a specific inhibitory effect on dolomite. XPS and Ca2+ dissolution tests further indicated that Tween 80 inhibited dolomite by binding Ca2+ with its EO groups. This action reduced the adsorption of Ca2+ with NaOL and improved the separation of magnesite and dolomite.



中文翻译:

吐温80以NaOL为捕收剂对菱镁矿和白云石浮选分离的影响。

由于白云石具有相同的晶体结构,相似的化学组成和高溶解度,因此很难通过油酸钠(NaOL)与菱镁矿分离。这项工作通过浮选测试,溶液化学计算,表面张力测量,Zeta电位测量,接触角测量,FTIR光谱测量和XPS,研究了吐温80作为辅助试剂对以NaOL为浮选剂的菱镁矿和白云石浮选的影响测量。浮选实验和接触角分析表明,当使用NaOL作为捕收剂时,吐温80的添加增强了菱镁矿的漂浮性,并削弱了白云石的漂浮性。表面张力分析,Zeta电位分析,FTIR光谱分析表明,吐温80通过促进NaOL溶液的溶解和分散,可以增强NaOL在矿物表面的吸附。溶液化学计算,Zeta电位分析和FTIR光谱分析也表明,Ca2+和CaOH +是浮选过程中白云石的活性成分,吐温80对白云石具有特定的抑制作用。XPS和Ca 2+溶解测试还表明,吐温80通过将Ca 2+与它的EO基团结合来抑制白云石。该作用减少了NaOL对Ca 2+的吸附,并改善了菱镁矿和白云石的分离。

更新日期:2020-07-05
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