In this paper, a novel collector N-octanoyl-S-carboxyethyl thiocarbamate (OCETC) containing CO, CS and -COOH groups was synthesized and applied to recover malachite. The flotation performance and adsorption mechanism of OCETC on malachite surface were systematically investigated by DFT calculation, zeta potential, FTIR, XPS, contact angle measurements and flotation experiments. It was found that CO, CS and -COOH groups were the functional sites which could react with Cu(II) ions on malachite surface and formed COCu(I) and CSCu(I) bonds. The adsorption of OCETC on malachite surface significantly improved its surface hydrophobicity since the contact angle of water on malachite changed from 46.5° to 78.0°. The flotation experiments demonstrated that 6 × 10⁻⁵ mol/L OCETC enabled the recovery of up to 98.24% malachite at pH 8.0. Under the same flotation conditions, OCETC exhibited comparable flotation recovery for malachite compared to octyl hydroxamic acid (98.43%), but much better than that by benzoyl hydroxamic acid (54.13%).

本文合成了一种新型捕收剂N-辛酰基-S-羧乙基硫代氨基甲酸酯（OCETC），并用于回收孔雀石。通过DFT计算、zeta电位、FTIR、XPS、接触角测量和浮选实验，系统地研究了OCETC在孔雀石表面的浮选性能和吸附机理。发现CO、C S和-COOH基团是孔雀石表面与Cu(II)离子反应生成C O Cu(I)和C S的功能位点。Cu(I) 键。OCETC在孔雀石表面的吸附显着提高了其表面疏水性，因为孔雀石上的水接触角从46.5°变为78.0°。浮选实验表明，6 × 10 ^-5  mol/L OCETC 能够在 pH 8.0 条件下回收高达 98.24% 的孔雀石。在相同浮选条件下，OCETC 对孔雀石的浮选回收率与辛基异羟肟酸（98.43%）相当，但远优于苯甲酰异羟肟酸（54.13%）。