Method for eluting Fe<3+> in P204 extracting agent

A P204, extraction agent technology, applied in the field of hydrometallurgy, to achieve the effect of regeneration and recycling, low equipment requirements, and small environmental pollution

Inactive Publication Date: 2012-09-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot fundamentally solve the problem of moderate extraction agent. After repeated several times, it can only be completely replaced with a new extraction agent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Measure 30mL of the above Fe 3+ For the poisoned P204 extractant, prepare 20mL of phosphorous acid solution with a concentration of 0.6mol / L, then add it to the poisoned P204 extractant, and react for 30 minutes under the condition of heating in a water bath at 60°C, let the liquid stand still, separate layers, The upper organic phase is the extraction phase for eluting and removing iron, that is, the regenerated P204 extractant.

[0020] Take the lower layer of water phase, and use the determination method of the elution efficiency of iron to measure Fe in the water phase. 3+ The content of Fe was calculated 3+ The elution efficiency was 35%.

[0021] According to the above vanadium extraction method, the regenerated P204 extractant is applied to the extraction of vanadium, and the extraction efficiency of vanadium is increased by 60%.

Embodiment 2

[0023] Measure 30mL of the above Fe 3+ Poisoned P204 extractant, then add 0.2g of sodium borohydride solid, react in a water bath at 60°C for 30 minutes; then add 20mL of sulfuric acid solution (prepared from 98wt% concentrated sulfuric acid and water with a volume ratio of 1:10), The iron ions are eluted into the water phase; the liquid is left to stand and separated into layers, and the upper organic phase is the extraction phase for elution and removal of iron, that is, the regenerated P204 extractant.

[0024] Take the lower layer of water phase, and use the determination method of the elution efficiency of iron to measure Fe in the water phase. 3+ The content of Fe was calculated 3+ The elution efficiency was 25%.

[0025] According to the above vanadium extraction method, the regenerated P204 extractant is applied to the extraction of vanadium, and the extraction efficiency of vanadium is increased by 60%.

Embodiment 3

[0027] Measure 20mL of the above Fe 3+ For the poisoned P204 extractant, prepare 10mL of oxalic acid solution with a concentration of 0.8mol / L, then add it to the poisoned P204 extractant, and react for 1 hour under the condition of heating in a water bath at 75°C, let the liquid stand still, separate layers, and the upper layer The organic phase is the extraction phase for eluting and removing iron, that is, the regenerated P204 extractant.

[0028] Take the lower layer of water phase, and use the determination method of the elution efficiency of iron to measure Fe in the water phase. 3+ The content of Fe was calculated 3+ The elution efficiency was 80%.

[0029] According to the extraction method of vanadium mentioned above, the regenerated P204 extractant is applied to the extraction of vanadium, and the extraction efficiency of vanadium is increased by 70%.

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Abstract

The invention discloses a method for eluting Fe<3+> in a P204 extracting agent, and belongs to the technical field of hydrometallurgy. The method is based on the principle that the stability of complex generated in the reaction between Fe<2+> and the P204 extracting agent is lower than that of the Fe<3+>, and achieves the aim of eluting Fe<3+> in the poisonous extracting agent by adding a reducing reagent into the extracting agent; and the elution efficiency of the Fe<3+> is more than 80%, so that the Fe<3+> in the P204 extracting agent can be effectively removed. The method can be applied to the technology for extracting vanadium in stone coal by an acid leaching method, and the P204 extracting agent combined with the Fe<3+> is treated by the method, so that the vanadium extraction efficiency can be improved by more than 60%, and the extracting agent can be regenerated and recycled. Compared with the existing method for removing Fe by concentrated sulfuric acid of industry, the method has the advantages of being higher in efficiency for removing Fe by the reducing reagent, lower in requirement for equipment, less in pollution for environment and worth of being widely popularized.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, in particular to a method for eluting Fe in P204 extractant 3+ method, and apply this method to the process of extracting vanadium from stone coal. Background technique [0002] Di-(2-ethylhexyl) phosphate (D2EHPA, referred to as P204), the molecular formula is C 16 h 35 o 4 p. P204 is a viscous oily liquid with strong acidity, insoluble in water, soluble in acetone, ethanol and other organic solvents, with a density of 0.965g / mL at room temperature, in non-polar solvents such as kerosene, carbon tetrachloride During neutralization, P204 exists in a dimer structure due to intermolecular hydrogen bonds. P204 is an industrial extractant widely used in the separation of rare earth elements and hydrometallurgy of non-ferrous metals. It is often used in the extraction process of non-ferrous metals such as vanadium, copper, and uranium. [0003] When P204 is used as the extractant to extr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/38C22B34/22
CPCY02P10/20
Inventor 金鑫汪庭语
Owner BEIJING UNIV OF CHEM TECH
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