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The separation behavior and mechanism of scheelite and dolomite using locust bean gum as depressant
Minerals Engineering ( IF 4.9 ) Pub Date : 2023-07-31 , DOI: 10.1016/j.mineng.2023.108280
Wang Ziming , Feng Bo , Chen Yuangan

Dolomite is a common vein mineral in scheelite, but how to selectively suppress dolomite in flotation of scheelite has not been addressedin the past research works. In this paper, the depressive behavior of locust bean gum (LBG) in separating scheelite from dolomite is investigated and a possible inhibition mechanism is proposed. The flotation results proved that LBG (18 mg/L) could effectively inhibit dolomite in scheelite flotation at pH = 9, and the obtained grade was 65.69 % of scheelite concentrate. Moreover, combined with the results of XPS, FTIR, Zeta potential, and contact angle experiments, it was inferred that LBG would selectively accumulate on the dolomite surface due to the presence of denser and more active action sites on the surface; and LBG could be stably adsorbed on the dolomite surface based on the stable complexation reaction between the carboxyl groups in LBG molecules and Mg2+ on the dolomite surface. Notably, the preferential adsorption of LBG not only brings a large number of hydrophilic groups to dolomite but also interference with the adsorption of sodium oleate, leading to a substantial decrease of the hydrophobicity of dolomite and finally realizing the selective inhibition of dolomite in scheelite flotation.



中文翻译:

刺槐豆胶作为抑制剂分离白钨矿和白云石的行为及机理

白云石是白钨矿中常见的脉矿物,但如何在白钨矿浮选中选择性地抑制白云石的存在,在以往的研究工作中尚未得到解决。本文研究了刺槐豆胶(LBG)在从白云石中分离白钨矿时的抑制行为,并提出了可能的抑制机制。浮选结果证明,在pH=9时,LBG(18 mg/L)能有效抑制白钨矿浮选中的白云石,获得的白钨矿精矿品位为65.69%。此外,结合XPS、FTIR、Zeta电位、接触角实验的结果,推测由于表面存在更致密、更活跃的作用位点,LBG会选择性地聚集在白云石表面;基于LBG分子中的羧基与Mg之间的稳定络合反应,LBG可以稳定地吸附在白云石表面白云石表面2+ 。值得注意的是,LBG的优先吸附不仅给白云石带来大量亲水基团,而且干扰油酸钠的吸附,导致白云石疏水性大幅下降,最终实现白云石浮选中对白云石的选择性抑制。

更新日期:2023-08-01
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