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Method for recovering rare earth from low-concentration rare earth solution through prussian blue colloidal nanoparticles

A technology of Prussian blue and nanoparticles, which is applied in the fields of rare earth hydrometallurgy and wastewater treatment, can solve the problems of large secondary pollution, high resin cost, and small loading capacity, and achieve large loading capacity of rare earths, high recovery rate of rare earths, and extensive The effect of applying the foreground

Inactive Publication Date: 2013-06-19
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The resin adsorption method is also relatively simple, but the loading capacity is small, the resin cost is high, and rare earth desorption is difficult
Although the extraction method has high efficiency and large enrichment factor, the ratio is too small, the loss of the extraction agent is large, the cost is high, and the problems of secondary pollution have not been completely solved.

Method used

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  • Method for recovering rare earth from low-concentration rare earth solution through prussian blue colloidal nanoparticles
  • Method for recovering rare earth from low-concentration rare earth solution through prussian blue colloidal nanoparticles
  • Method for recovering rare earth from low-concentration rare earth solution through prussian blue colloidal nanoparticles

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Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: with FeCl 3 . 6H 2 O and K 4 Fe(CN) 6 as raw material, according to 1:1.2 (K 4 Fe(CN) 6 Slight excess to ensure the molar ratio of colloidal PB) Accurately weigh the corresponding raw materials, at room temperature, after being dissolved in distilled water, FeCl 3 The solution was slowly added dropwise to K 4 Fe(CN) 6 In the solution, after stirring for 15 minutes, add a small amount of acetone, let stand, centrifuge, and dry naturally to obtain solid PB. Its particle size distribution diagram is shown in figure 1 . Disperse the synthesized PB-CNP into 20mL aqueous solution with pH=1, 2, 3, 4, 5, 6, 7, 8, 9 respectively, and the concentration of PB-CNP is 0.1mg / mL. After standing for 3 hours, centrifuge at a speed of 6000 rpm in a high-speed centrifuge, take the supernatant to measure the absorbance, calculate the amount of unsettled PB-CNP according to the standard curve of PB-CNP, and then calculate the amount of PB that has settled. Its relat...

Embodiment approach 2

[0028] Embodiment 2: At room temperature, different amounts of Gd were added to aqueous solutions of pH=3, 4, 5, 6, and 7 containing 1 mg of PB-CNP 3+ (10~300μg), let stand for 3 hours and centrifuge at high speed, measure the amount of PB-CNP remaining in the supernatant by colorimetry, and investigate the coagulation characteristics of PB-CNP caused by the adsorption of rare earth ions. Taking the condition of pH=3 as an example, take 12 parts of colloidal aqueous solution containing 1mg PB in a beaker, add 10μg / mLGd respectively 3+ Solutions 5, 8, 9, 10, 11, 12, 13, 14, 15, 20, 25, 30mL, after stirring, stand for adsorption for 3 hours, centrifuge at high speed, take the supernatant to measure the absorbance, and calculate the non-sedimentation according to the standard curve of PB The amount of PB-CNP, thus inferring the amount of PB that has settled. The pH=4~7 relationship curve is also made in the same way. Its adsorption curve is shown in image 3 .

Embodiment 3

[0029] Example 3: Determination of 1mg PB-CNP to 300μg Gd under constant temperature (T=30°C) constant volume (50mL) shaking conditions 3+ The change curve of adsorption capacity under different pH and equilibrium time conditions. The specific experimental method is: taking the condition of pH=2 as an example, put six dialysis bags containing 10mL 0.2mg / mL PB into conical flasks respectively, and add 60mL 10μg / mL Gd 3+ After mixing with 10mL of distilled water, adjust the solution to the set pH, shake at constant temperature for different times (10-60min), take the supernatant, and use the azoarsenic III colorimetric method to measure the residual gadolinium concentration in the solution (measure the absorbance, according to Gd 3+ Calculate the unadsorbed Gd from the standard curve 3+ amount), the Gd that has been adsorbed by PB was calculated by subtraction method 3+ amount. The adsorption amount of gadolinium was plotted against time to obtain the adsorption curves under ...

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Abstract

The invention relates to a method for recovering rare earth from low-concentration rare earth solution through prussian blue colloidal nanoparticles (PB-CNP). The method comprises the following steps: firstly synthesizing a stable PB-CNP colloidal solution, loading into a bag produced by a dialysis membrane, enabling a dialysis bag containing PB-CNP suspension to be in contact with rare earth material liquid (the pH value is 4-7), and enabling rare earth ions to pass through membrane holes to be in contact with the PB-CNP for being adsorbed. Dilute acid solution is used for desorbing the rareearth from the PB-CNP suspension which absorbs the rare earth ions, thereby achieving the purpose of recovering the rare earth. The PB-CNP suspension and the rare earth material liquid can also be arranged in different channels on the two sides of the membrane of a membrane component for flowing in a countercurrent way, thereby achieving the high-efficient enrichment effect. The method has the advantages of simple process, large rare earth loading amount, high rare earth recovery rate and the like, and can be widely used for the rare earth material liquid of rare earth mines and separation factories; and furthermore, by adopting the method, the rare earth ions in low-concentration rare earth wastewater can be completed removed and recovered, thereby having wide application prospects.

Description

Technical field: [0001] The invention belongs to the technical field of rare earth hydrometallurgy and wastewater treatment, and specifically relates to a method for recovering rare earths from rare earth solutions by using Prussian blue colloidal nanoparticles (PB-CNP) as an adsorbent. Background technique: [0002] Rare earth functional materials are widely used in high-tech industries, national defense, and aerospace technology. However, with the strengthening of the development of rare earth resources, the demand for rare earths increases, and the high-grade rare earth mines are decreasing. Therefore, the high-efficiency rare earth extraction technology for low-grade rare earth ores and the rare earth recovery technology in the low-concentration rare-earth wastewater generated in the rare-earth production process have received extensive attention in recent years, especially from the perspective of environmental and resource protection. Rare earth recovery technology in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B3/24C22B3/22C02F1/44C02F1/28
CPCY02P10/20
Inventor 李永绣管玮刘艳珠李东平李静周雪珍周新木吴燕利
Owner NANCHANG UNIV
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