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Alkaline extract residue except molybdenum extraction and recovery of molybdenum Study

Author: LeHongYan
Tutor: QiMeiFu
School: Nanchang University
Course: Environmental Science
Keywords: Solvent extraction N263 Alkaline solvent Molybdenum Resource utilization
CLC: X70
Type: Master's thesis
Year: 2010
Downloads: 98
Quote: 0
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Abstract


In this thesis, Ganzhou factory production APT slag generated in addition to molybdenum as the research object , using alkaline leaching - solvent extraction method for the recovery of molybdenum have been studied from the extraction conditions on the rate of extraction of molybdenum , molybdenum stripping conditions on the stripping rate the impact of extraction mechanism and other aspects of the extraction kinetics study on the addition of molybdenum in molybdenum slag recycling has certain reference value. This selection of different organic phase extraction experiments to determine the carbonate type N263 octanol kerosene as extractant organic phase extractant N263 in alkaline solution for molybdenum extraction mechanism showed that: molybdenum extraction distribution ratio logarithm lgD and lg [ (R3NCH3) 2CO3] o a slope of about 1 linear relationship may be extractant or a solution polymerization reaction occurs between the OH-of the present extraction MoO42- competitive effect; thermodynamic analysis showed that: in the alkaline solution used N263 molybdenum extraction solvent extraction process enthalpy change ΔH is -2.19kJ/mol, molybdenum extraction process is a slightly exothermic process , but not conducive to raising the temperature of molybdenum extraction . Kinetic studies showed that: mixing intensity and the phase change in the contact area of ??the interface has little effect on the extraction of molybdenum , the reaction was extracted in a short period of time can reach equilibrium , the extraction of molybdenum in an alkaline solution by \The effects of initial pH , extractant concentration , phase concentration, the concentration of molybdenum in solution , extraction compared to molybdenum extraction temperature on the extraction rate were studied, and orthogonal experiment optimum extraction conditions . The initial concentration of molybdenum in the solution 10g / L, the organic phase was 20% of carbonate type N263 20% 60% kerosene -octanol , pH of 12.5 , compared to 2:1 , extraction time of 15 minutes , stirring speed was extracted 800rpm, phase separation time was 5min experimental conditions , a single-stage extraction of molybdenum up to 87.4% . Using 1.0mol / L of NaCl solution as stripping agent , stripping compared to O / A 1:1 , stirring speed 800rpm, oscillation -extracted for 10 minutes , phase time of 5 minutes under the conditions of the single-stage molybdenum back-extraction was about 86% . The raffinate returned to the leaching process leaching , can implement closed loop to achieve raffinate recycle , access to certain economic and environmental benefits .

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues
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