Abstract In this paper, novel thiadiazole-thione surfactants including 5-heptyl-1,3,4-thiadiazole-2-thione (HpSDT), 5-phenyl-1,3,4-thiadiazole-2-thione (PSDT) and 5-(2-hydroxyphenyl)-1,3,4-thiadiazole-2-thione (HPhSDT) were synthesized and originally introduced as collectors in froth flotation. Micro-flotation tests showed that HpSDT exhibited better flotation response to malachite than PSDT and HPhSDT, as well as excellent flotation selectivity against quartz. The contact angle results inferred that the hydrophobization intensity of these collectors toward malachite was in the order as HpSDT > PSDT > HPhSDT. ζ-potential recommended a chemisorption of HpSDT on malachite surfaces. FTIR deduced that cupric or cuprous atoms might bond with the S and N atoms of HpSDT to form a conjugated ring. XPS further gave an additional evidence that HpSDT-Cu(I) complexes were produced on malachite surfaces via combining surface Cu atoms with HpSDT’s N and S atoms, with reducing surface Cu(II) to Cu(I). The tighter orientation arrangement on malachite and stronger hydrophobicity rendered HpSDT to possess better flotation affinity toward malachite than PSDT and HPhSDT.

中文翻译：

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噻二唑硫酮表面活性剂的制备、浮选性能及对孔雀石的吸附机理

摘要 本文介绍了新型噻二唑-硫酮表面活性剂，包括 5-庚基-1,3,4-噻二唑-2-硫酮 (HpSDT)、5-苯基-1,3,4-噻二唑-2-硫酮 (PSDT) 和 5 -(2-羟基苯基)-1,3,4-噻二唑-2-硫酮 (HPhSDT) 被合成并最初作为泡沫浮选中的捕收剂引入。微浮选试验表明，HpSDT 对孔雀石的浮选响应优于 PSDT 和 HPhSDT，对石英具有优异的浮选选择性。接触角结果推断这些捕收剂对孔雀石的疏水化强度顺序为 HpSDT > PSDT > HPhSDT。ζ-potential 建议在孔雀石表面上化学吸附 HpSDT。FTIR 推断铜或亚铜原子可能与 HpSDT 的 S 和 N 原子键合形成共轭环。XPS 进一步提供了额外的证据，表明 HpSDT-Cu(I) 配合物是通过将表面 Cu 原子与 HpSDT 的 N 和 S 原子结合，将表面 Cu(II) 还原为 Cu(I) 而在孔雀石表面产生的。孔雀石上更紧密的取向排列和更强的疏水性使 HpSDT 对孔雀石具有比 PSDT 和 HPhSDT 更好的浮选亲和力。