The derivatives of the reaction liquid for synthesizing N-（phosphonomethyl） iminodiacetic acid （PMIDA） were synthesized with 9-fluorenyl methyl chlomformate （FMOC-C1） as the derivatization reagent. The separatio...The derivatives of the reaction liquid for synthesizing N-（phosphonomethyl） iminodiacetic acid （PMIDA） were synthesized with 9-fluorenyl methyl chlomformate （FMOC-C1） as the derivatization reagent. The separation of the derivatives was performed on a Gemini C18 column at room temperature by isocratic elution. The mobile phase was composed of 60% 0.05 M Nail2 PO4 （pH = 3.5） and 40% CH3 CN at a flow rate of 1 ml/min. The injection volume was 10 td, and the detection wavelength was 265 nm. The linear ranges of the derivatives of iminodiacetonitrile, iminodiacetic acid （IDA） and ammonia were, respectively, 0.02-1.2, 0.02-1.2 and 0.1 -2. 0 mg/ml with correlation coefficients not smaller than 0. 999 8. The detection limits for the derivatives were, respectively, 0. 000 4, 0. 000 4 and 0.003 mg/ml. The average recoveries of 3 derivatives were respectively 99.96%, 99. 86% and 99.89%, respectively, with relative standard deviation values not smaller than 1.6%. The method developed in the present paper could be used for monitoring the reaction system for preparation of PMIDA by IDA.展开更多
This study explored the use of N-(phosphonomethyl)iminodiacetic acid(PMIDA)as an eco-friendly depressant for the selective flotation of galena and sphalerite.Microflotation tests were performed to assess the effective...This study explored the use of N-(phosphonomethyl)iminodiacetic acid(PMIDA)as an eco-friendly depressant for the selective flotation of galena and sphalerite.Microflotation tests were performed to assess the effectiveness of PMIDA.Moreover,the depression mechanism of PMIDA was analyzed through solution chemistry calculations,zeta potential measurements,contact angle determination,X-ray photoelectron spectroscopy,and densityfunctional theory calculations.Solution chemistry calculations revealed that the presence of PMIDA as PMIDA3-ions in the pulp optimized the depressive effect on sphalerite.Additionally,contact angle results indicated a significant improvement in the surface hydrophilic of sphalerite after PMIDA treatment.Zeta potential measurements revealed that the adsorption capacity of xanthate on the sphalerite surface after PMIDA treatment significantly decreased.X-ray photoelectron spectroscopy analyses indicated that the adsorption of PMIDA on the sphalerite surface was associated with the phosphate functional groups of PMIDA.Density-functional theory simulation data indicated preferential adsorption of PMIDA on the sphalerite surface.These results indicate the potential of PMIDA as a promising depressant to inhibit the flotation of sphalerite and facilitate the selective flotation of galena.展开更多
文摘The derivatives of the reaction liquid for synthesizing N-（phosphonomethyl） iminodiacetic acid （PMIDA） were synthesized with 9-fluorenyl methyl chlomformate （FMOC-C1） as the derivatization reagent. The separation of the derivatives was performed on a Gemini C18 column at room temperature by isocratic elution. The mobile phase was composed of 60% 0.05 M Nail2 PO4 （pH = 3.5） and 40% CH3 CN at a flow rate of 1 ml/min. The injection volume was 10 td, and the detection wavelength was 265 nm. The linear ranges of the derivatives of iminodiacetonitrile, iminodiacetic acid （IDA） and ammonia were, respectively, 0.02-1.2, 0.02-1.2 and 0.1 -2. 0 mg/ml with correlation coefficients not smaller than 0. 999 8. The detection limits for the derivatives were, respectively, 0. 000 4, 0. 000 4 and 0.003 mg/ml. The average recoveries of 3 derivatives were respectively 99.96%, 99. 86% and 99.89%, respectively, with relative standard deviation values not smaller than 1.6%. The method developed in the present paper could be used for monitoring the reaction system for preparation of PMIDA by IDA.
基金supported by the National Natural Science Foundation of China (No.52264026)Yunnan Fundamental Research Projects (No.202301AW070018).
文摘This study explored the use of N-(phosphonomethyl)iminodiacetic acid(PMIDA)as an eco-friendly depressant for the selective flotation of galena and sphalerite.Microflotation tests were performed to assess the effectiveness of PMIDA.Moreover,the depression mechanism of PMIDA was analyzed through solution chemistry calculations,zeta potential measurements,contact angle determination,X-ray photoelectron spectroscopy,and densityfunctional theory calculations.Solution chemistry calculations revealed that the presence of PMIDA as PMIDA3-ions in the pulp optimized the depressive effect on sphalerite.Additionally,contact angle results indicated a significant improvement in the surface hydrophilic of sphalerite after PMIDA treatment.Zeta potential measurements revealed that the adsorption capacity of xanthate on the sphalerite surface after PMIDA treatment significantly decreased.X-ray photoelectron spectroscopy analyses indicated that the adsorption of PMIDA on the sphalerite surface was associated with the phosphate functional groups of PMIDA.Density-functional theory simulation data indicated preferential adsorption of PMIDA on the sphalerite surface.These results indicate the potential of PMIDA as a promising depressant to inhibit the flotation of sphalerite and facilitate the selective flotation of galena.
