Abstract In this paper, α-chloro-oleate acid (α-COA) and sodium hexametaphosphate (SHMP) were employed as collector and depressant in the flotation separation of magnesite from dolomite respectively. Properties of these two reagents were investigated through micro-flotation tests, zeta potential measurements, contact angle measurements and theoretical computation of adsorption energy based on conceptual density functional theory (DFT). Zeta potential measurements results revealed that SHMP was selectively adsorbed on the surface of dolomite, which leads to an exclusively depressing effect on dolomite. Results of contact angle measurements and theoretical computation indicated that α-COA had a stronger collecting ability to magnesite because of a stronger adsorption occurred on the surface of magnesite. In micro-flotation of artificially mixed minerals, separation of magnesite from dolomite with Gaudin's selectivity index up to 6.42 was succeeded using α-COA as collector and SHMP as depressant.

中文翻译：

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α-氯油酸作为捕收剂从白云石中选择性浮选菱镁矿

摘要 本文采用α-氯油酸（α-COA）和六偏磷酸钠（SHMP）分别作为捕收剂和抑制剂，分别用于菱镁矿与白云石的浮选分离。通过微浮选试验、zeta 电位测量、接触角测量和基于概念密度泛函理论 (DFT) 的吸附能理论计算研究了这两种试剂的性质。Zeta 电位测量结果表明，SHMP 选择性地吸附在白云石表面，这导致对白云石的排他性抑制作用。接触角测量和理论计算的结果表明，α-COA 对菱镁矿的收集能力更强，因为在菱镁矿表面发生了更强的吸附。