新型羟肟酸捕收剂的合成及其对孔雀石的捕收机理研究

Synthesis of A New Hydroxamic Acid Collector and Its Collection Mechanism for Malachite

研究了一种新型螯合捕收剂邻苯二羟肟酸在孔雀石[Cu_(2)CO_(3)(OH)_(2)]与石英(SiO_(2))浮选分离中的应用。通过微浮选试验,评价了邻苯二羟肟酸对孔雀石和石英的浮选性能。结果表明,邻苯二羟肟酸对孔雀石有较强的吸附和选择性,能有效分离孔雀石和石英。以邻苯二羟肟酸为捕收剂,在pH为9、药剂用量80 mg/L的条件下对人工混合矿物具有良好的分离效果,孔雀石回收率70%,石英回收率5%。通过接触角、SEM-EDS、Zeta电位、吸附量、傅里叶变换红外光谱(FT-IR)和X射线光电子能谱(XPS)分析研究了吸附机理,结果表明邻苯二羟肟酸的与孔雀石表面的Cu^(2+)离子发生强烈的化学吸附,处理后孔雀石疏水性大大提高,选择性较好,可有效分离孔雀石与脉石矿物。

The application of phthalic acid,a new chelating collector,in the flotation separation of malachite(Cu_(2)CO_(3)(OH)_(2))and quartz(SiO_(2))was studied.The flotation performance of phthalic acid on malachite and quartz was evaluated by micro-flotation test.The results show that phthalic acid has strong adsorption and selectivity for malachite and can effectively separate malachite and quartz.Using phthalic acid as collector,the separation effect of artificial mixed minerals was good at pH 9 and dosage of 80 mg/L.And the recovery of malachite and quartz was 70%and 5%,respectively.The adsorption mechanism was studied by contact angle,SEM-EDS,Zeta potential,adsorption capacity,Fourier Transform infrared spectroscopy(FT-IR)and X-ray photoelectron spectroscopy(XPS).The results showed that the strong chemical adsorption between phthalic acid and Cu^(2+)ions on malachite surface occurred.After treatment,the hydrophobicity of malachite was greatly improved and the selectivity was good.It can effectively separate malachite and gangue minerals.