| At present,the production of copper concentrate in China is difficult to meet the demand,and the copper sulfide ore separated easily is consumed in large quantities.So,the exploit and utilize of copper oxide is particularly important.Currently,the collector used in the direct flotation method of copper oxide has the problem of insufficient collecting capacity.In this paper,phenylpropylhydroxamic acid was synthesized with methyl cinnamate and hydroxylamine hydrochloride as raw materials in flotation test and mechanism study for copper oxide flotation,and compared with benzohydroxamic acid which is widely used in industry.The results of quantum chemical simulation calculation show that the HOMO value of phenylpropylhydroxamic acid is higher than that of benzhydroxamic acid,which means that phenylpropylhydroxamic acid could be easier to provide electrons.The dipole moment and van der Waals force of phenylpropylhydroxamic acid are also larger,indicating that the adsorption capacity of phenylpropylhydroxamic acid is better.The results show that phenylpropylhydroxamic acid has better adsorption capacity than benzhydroxamic acid.The flotation properties of malachite,chrysocolla and gangue treated with phenylacrylhydroxamic acid and benzohydroxamic acid were compared by micro-flotation experiments.The results show that the flotation performance of phenylacrylhydroxamic acid to malachite and chrysocolla is stronger than that of benzohydroxamic acid.Phenylacrylhydroxamic acid and benzohydroxamic acid have similar flotation performance on calcite and dolomite,and neither of them can collect gangues.The experimental results of artificial ore mixing show that when carboxylated chitosan is used as the inhibitor,phenylacrylhydroxamic acid can effectively separate malachite and gangues,while the grade and recovery of Cu can reach 51.4% and 85%,respectively.The separation effect of phenylacrylhydroxamic acid on malachite and gangue is poor.The grade and recovery of Cu are 39.8% and 60.2%,respectively.The adsorption mechanism of phenylacrylhydroxamic acid on malachite and chrysocolla was studied by contact angle tests,Zeta-potential tests,infrared spectrum,X-ray electron spectroscopy(XPS)and adsorption capacity tests.The experimental data showed that phenylacrylhydroxamic acid could increase the contact angle of the surface of malachite and chrysocolla,and enhance the hydrophobicity of the two kinds of copper oxide minerals,and the electrokinetic potential of malachite and chrysocolla decreased after treatment with CHA.Through infrared spectrum and XPS analysis,it is concluded that phenylacrylhydroxamic acid reacts with malachite and chrysocolla,and chemical adsorption occurs on the surface of mineral particles.The adsorption capacity tests showed that the phenylacrylhydroxamic acid and benzohydroxamic acid could effectively adsorb on the surface of malachite and chrysocolla,and the adsorption capacity of phenylacrylhydroxamic acid on the surface of the two copper oxides was larger.The flotation characteristics and mechanism of phenylacrylhydroxamic acid on malachite,chrysocolla and gangues were studied in this paper,which provided reference significance for the application of phenylacrylhydroxamic acid in the actual production of copper oxide. |
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