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PEG- salt -H_2O aqueous two-phase system , titanium , zirconium enrichment of trace

Author: ZhangChongZuo
Tutor: ZhangJinZhu
School: Kunming University of Science and Technology
Course: Mineral Processing Engineering
Keywords: Aqueous two-phase system Titanium Zirconium Separation and enrichment Extraction
CLC: O658
Type: Master's thesis
Year: 2004
Downloads: 193
Quote: 0
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Abstract


Aqueous two-phase system in recent years, it has rapidly developed a new class of extraction separation system. It utilizes the water-soluble polymer in the inorganic salts can be separated into two phases, the substance to be separated in the principles of the selective distribution of the two phases, the use of a specific extraction method, to the desired substance were separated. In this paper, polyethylene glycol 2000 (PEG2000) - salt-H 2 O aqueous two-phase system of the same family (Ⅳ B family) elements of titanium (IV) and zirconium (IV) enrichment of trace. (1) to study the phase separation conditions of aqueous two-phase systems, and inorganic salts, pH, the polymer of such factors as the degree of polymerization of the aqueous two-phase system. (2) study the Arsenazo Ⅲ as extractant, titanium (IV) and zirconium (IV) in aqueous two-phase system of allocation. Through a large number of experiments carried out on the impact of the extraction separation acidity, amount of extractant, amount of salt, ionic strength, and many other factors. Different proportions of titanium (IV) and zirconium (IV) hybrid separation experiments. (3) Determination of the molar ratio and continuous variation method PEG phase Zr (Ⅳ) with arsenazo III complexation. 9mol / L HCl, Zr (Ⅳ): ASA Ⅲ = 1:2. Absorption spectroscopy the PEG phase titanium (IV) ion Arsenazo Ⅲ role relationships, and examine the different nature of the surfactant on titanium (IV) ions in aqueous two-phase system with Arsenazo Ⅲ extraction rate impact. Based on the experimental results, the theoretical analysis of the aqueous two-phase system of titanium (IV) and zirconium (IV) extraction mechanism. Think 2 O aqueous two-phase system of extraction of the metal ion complexation, electrostatic attraction, hydrogen bonding, hydrophobic key variety of forces results in the PEG-salt-H. (4) ions measured by two security behalf of more than Lin methane and Arsenazo III as the chromogenic agent, to seek out the interference of titanium (IV) and zirconium (IV) and the brine phase in the PEG phase spectrophotometric method. Spectrophotometric determination of titanium (IV) and zirconium (IV), respectively. Stripping to the experimental determination of the complex system of settling time and explore some of the factors that affect the determination, to determine the best color conditions, make full use of the advantages of the aqueous two-phase system, without directly in the upper PEG phase determination. By mixing different proportions of titanium (IV) and zirconium (IV) separation experiments. To determine the best separation conditions. Added 6g ammonium sulfate fractionation phase conditions, the successful realization of titanium (IV) and zirconium (IV) mixed at pH = 0.7,1.0 m10.1% Arsenazo III solution, 15m130% PEG solution, the total volume of 30ml the quantitative separation of the liquid, 98.4% Zr (Ⅳ) phase enriched in PEG and 96% Ti (Ⅳ) enriched in the brine phase. Compared with traditional solvent extraction separation rate, easy to operate, the advantages of inexpensive, non-toxic.

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CLC: > Mathematical sciences and chemical > Chemistry > Analytical Chemistry > Separation of elements and compounds
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