In this study, the effect of 1,2-diaminopropane (1,2-DAP) on the formation of chelated copper on chrysocolla surfaces and its response to flotation was investigated. The results showed that 1,2-DAP effectively activates chrysocolla. Micro-flotation test revealed that using 50–70 mg/L of 1,2-DAP as an activator and 1.8 × 10 mol/L of sodium isoamyl xanthate (SIAX) as a collector increased chrysocolla flotation recovery from 25 % to 86 %. Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, zeta potential measurements, xanthate adsorption capacity, and time-of-flight secondary-ion mass spectrometry showed that after treated with 1,2-DAP, chelated copper was formed on chrysocolla through the interaction between C-N group with Cu(II), which promotes the effective adsorption of xanthate on chrysocolla surface. The additional adsorption of xanthate may be attributed to 1,2-DAP adsorption on chrysocolla, which shifted the surface potential positively. This shift was favorable for attracting negatively charged xanthate on the surface of chrysocolla. Meanwhile, the enhanced and stabilized presence of copper active sites on the surface of chrysocolla also facilitated the adsorption of more xanthates on the surface of chrysocolla, thus improving the hydrophobicity and floatability of chrysocolla.

中文翻译：

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1,2-二氨基丙烷对硅孔雀石表面螯合铜形成的影响及其对浮选的响应

在本研究中，研究了 1,2-二氨基丙烷 (1,2-DAP) 对硅孔雀石表面螯合铜形成的影响及其对浮选的响应。结果表明1,2-DAP能有效激活硅孔雀石。微浮选试验表明，使用50~70 mg/L的1,2-DAP作为活化剂和1.8×10 mol/L的异戊基黄原酸钠(SIAX)作为捕收剂，可使硅孔雀石的浮选回收率从25%提高到86%。傅里叶变换红外光谱、X射线光电子能谱、zeta电位测量、黄药吸附能力和飞行时间二次离子质谱分析表明，经1,2-DAP处理后，通过相互作用在硅孔雀石上形成了螯合铜。 CN基团与Cu(II)之间存在键合，促进黄药在硅孔雀石表面的有效吸附。黄原酸盐的额外吸附可能归因于硅孔雀石上的 1,2-DAP 吸附，这使表面电位发生正向移动。这种转变有利于在硅孔雀石表面吸引带负电的黄原酸盐。同时，硅孔雀石表面铜活性位点的增强和稳定也有利于更多的黄药在硅孔雀石表面的吸附，从而提高了硅孔雀石的疏水性和可漂浮性。