Utilisation of propyl gallate as a novel selective collector for diaspore flotation
Utilisation of propyl gallate as a novel selective collector for diaspore flotation
复制标题
利用没食子酸丙酯作为新型水硬铝石浮选选择性捕收剂
DOI：
10.1016/j.mineng.2018.11.002
复制
发表时间：
2019-01-15
影响因子：
4.8
通讯作者：
Sun, Wei
中科院分区：
文献类型：
--
作者：
Lyu, Fei;Gao, Jiande;Sun, Wei
没食子酸丙酯（3,4,5-三羟基苯甲酸丙酯；PG）是一种新型捕收剂，用于水硬铝石铝土矿浮选。通过微浮选试验将PG与作为典型捕收剂的油酸钠(NaOl)进行比较，评价PG对水硬石和高岭石的浮选性能。结果表明，在15 mg/L、pH 7-9条件下，PG对水硬石的捕集能力高于对高岭石。与NaOl相比，PG对水硬石也表现出对高岭石更高的选择性。 Zeta电位、吸附量、傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）分析表明，PG通过化学吸附和氢键作用吸附在硬水铝石表面，而PG几乎不吸附在高岭石表面。具体而言，PG通过其邻位氧形成五元环，与硬水铝石表面的Al原子螯合。这些发现表明PG可以作为水硬铝石浮选的新型捕收剂，并且活化的酚羟基也为浮选捕收剂的开发提供了新的见解。
Propyl gallate (propyl 3, 4, 5-trihydroxybenzoate; PG) was introduced as a new type of collector for diasporic bauxite flotation. The flotation performance of PG for diaspore and kaolinite was evaluated by comparing PG with sodium oleate (NaOl) as a typical collector through micro flotation tests. The results indicated that PG had higher collection ability for diaspore than for kaolinite at 15 mg/L and pH 7-9. Compared with NaOl, PG also exhibited higher selectivity for diaspore against kaolinite. Analyses of zeta potentials, adsorption amount, Fourier transform infrared spectra (FTIR) and X-ray photoelectron spectra (XPS) revealed that PG adsorbed onto diaspore surfaces through chemical adsorption and hydrogen bonding, whereas PG hardly adsorbed onto kaolinite surfaces. Specifically, PG chelated with Al atoms on the diaspore surfaces by forming five-member rings through its ortho oxygens. These findings indicated that PG could be adopted as a novel collector for diaspore flotation and the activated phenolic hydroxyl groups also offered new insights for the development of flotation collectors.