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Liquid-liquid-liquid three-phase extraction and separation method of enriched iron in middle phase

A technology of phase enrichment and separation of iron, applied in the direction of improving process efficiency, etc., can solve problems such as large extraction interference and complicated process

Inactive Publication Date: 2012-11-28
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In industry, solvent extraction is often used directly to select and extract target valuable metals. The presence of iron greatly interferes with the extraction of target valuable metals. Iron and target metals are often co-extracted into the organic phase, and the separation of iron and valuable metals is only It can be achieved through a series of tedious subsequent washing procedures or selective stripping steps, and the process is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 4g of polyethylene glycol with a molecular weight of 2000 and 5g of ammonium sulfate are dissolved in a solution containing 50 μmol of Fe(II), add phenanthroline 8 times the molar amount of Fe(II), adjust pH=1.0 with sulfuric acid, and settle to The volume is 20mL, then add 3.3mL 40% (v / v) trioctylphosphine oxide / n-dodecane mixed organic phase, the volume ratio of organic solvent and aqueous solution is 1:6, after shaking for 5min, under the condition of rotating speed 3000rpm After centrifugation for 10 min, a liquid-liquid-liquid three-phase system is formed at this time. The extraction rate of Fe(II) in polyethylene glycol phase reached 93.5%.

Embodiment 2

[0027] 5.5 g of polyethylene glycol with a molecular weight of 6000 and 2 g of sodium sulfate are dissolved in a solution containing 150 μmol of Fe(II) and 20 μmol of Pt(IV) (or Pd(II)), and 3 times the molar amount of Fe(II) is added. Use hydrochloric acid and sodium hydroxide to adjust pH = 6.0, and adjust the volume to 20 mL, then add 8 mL of 40% (v / v) trialkylphosphine oxide / n-heptane mixed organic phase, organic solvent and aqueous solution The volume ratio is 2:5. After shaking for 10 minutes, centrifuge at 2500 rpm for 10 minutes. At this time, a liquid-liquid-liquid three-phase system is formed. The extraction rate of Fe(II) in the polyethylene glycol middle phase reaches 99.3%, and all the Pt(IV) (or Pd(II)) is extracted into the upper phase.

Embodiment 3

[0029]1.8g molecular weight is the ethylene oxide-propylene oxide copolymer (wherein polyethylene oxide accounts for the 50wt% of copolymer) of 3000 and 5.5g ammonium sulfate are dissolved in containing 10 μ mol Fe (II) solution, add 3.3 times to The o-phenanthroline of Fe(II) molar weight is adjusted to pH=2.0 with sulfuric acid, and the volume is adjusted to 20mL, then 16mL of 20% (v / v) tributyl phosphate / n-heptane mixed organic phase is added, organic The volume ratio of the solvent and the aqueous solution is 1:1.25. After shaking for 30 minutes, it is centrifuged at 4000 rpm for 5 minutes. At this time, a liquid-liquid-liquid three-phase system is formed. The extraction rate of Fe(II) phase in ethylene oxide-propylene oxide copolymer reaches 97.5%.

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Abstract

The invention relates to the technical field of metallic ion extraction and separation, particularly a liquid-liquid-liquid three-phase extraction and separation method of enriched iron in a middle phase. The method comprises the following steps: (1) reducing Fe<3+> in an ferric ion water solution into Fe<2+>; (2) sequentially adding phenanthroline, water-soluble high molecular polymer and inorganic strong electrolyte salt into the solution obtained in the step (1), and sufficiently and evenly mixing to obtain a mixed solution, wherein the mol ratio of phenanthroline to Fe<2+> is (3-8):1; and(3) regulating the pH value of the mixed solution obtained in the step (2) to 1.0-6.0, adding a water-insoluble organic reagent, thoroughly mixing, standing, and centrifugalizing to obtain a three-phase system in which the upper, middle and lower layers coexist, wherein the phenanthroline and ferric ion complex enter the middle water phase containing the water-soluble high molecular polymer, thereby implementing liquid-liquid-liquid three-phase extraction and separation of enriched iron in the middle phase. The method provided by the invention can implement highly separation of target metal and iron.

Description

technical field [0001] The invention relates to the technical field of metal ion extraction and separation, in particular, the invention relates to a liquid-liquid-liquid three-phase extraction and separation method for enriching iron in a middle phase. Background technique [0002] Iron is in group VIII in the periodic table, and its valence electron shell configuration is 3d 6 4s 2 , when iron loses 3 valence electrons, the configuration of the outer electron shell is 3d 5 , is a half-filled stable structure, so the +3 oxidation state of iron is stable, followed by the +2 oxidation state. Iron is one of the most common elements in nature. In non-ferrous metal mineral raw materials, the content of iron is often higher than that of valuable metals. Iron is the main constituent element of more than 600 minerals. Almost all metallurgical industries that use minerals as raw materials involve the separation or extraction of iron. The analysis and detection of non-ferrous me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/26
CPCY02P10/20
Inventor 刘会洲谢铿黄焜
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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