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Method for enriching platinum and palladium from pressurized cyanating solution

A technology for enriching and desorbing liquid, which is applied in the field of palladium and platinum extraction, can solve the problems that the zinc contained in the liquid is difficult to return and use, and the operation is complicated, and achieves the effect of low cost and easy operation

Inactive Publication Date: 2012-12-05
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the zinc powder replacement method requires destroying the cyanide in the solution first, and the operation is more complicated, and it is difficult to return the zinc in the solution after replacement.

Method used

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  • Method for enriching platinum and palladium from pressurized cyanating solution
  • Method for enriching platinum and palladium from pressurized cyanating solution
  • Method for enriching platinum and palladium from pressurized cyanating solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The present embodiment is to measure the [Pt(CN) of commercial coconut shell activated carbon at different concentrations. 4 ] 2- The saturated adsorption capacity of Pt in the solution is specifically:

[0024] Weigh 1.0 g of commercial coconut shell activated carbon with a particle size of 6 to 16 mesh, and add it to 800 mL [Pt(CN) 4 ] 2- In the alkaline cyanide solution, the concentration of platinum solution was 5.87 mg / L, and then weighed 2.0 grams of commercial coconut shell activated carbon with a particle size of 6-16 mesh in quadruplicate, and added them to 500 mL [Pt (EN) 4 ] 2- In the alkaline cyanide solution, the concentration of platinum solution was 20.61 mg / L, 41.53 mg / L, 62.84 mg / L and 75.17 mg / L respectively, and was shaken and adsorbed on a Conrad oscillator for 4 hours, filtered, and the filtrate was determined for the concentration of metal ions. content. Calculate the [Pt(CN) of commercial coconut shell activated carbon at different concentra...

Embodiment 2

[0028] The present embodiment is to measure the [Pd(CN) of commercial coconut shell activated carbon at different concentrations. 4 ] 2- The saturated adsorption capacity of Pd in ​​the solution is specifically:

[0029] Weigh 1.0 g of commercial coconut shell activated carbon with a particle size of 6 to 16 mesh, and add it to 800 mL [Pd(CN) 4 ] 2- In the alkaline cyanide solution, the concentration of the palladium solution was 5.26 mg / L, and then weighed 2.0 g of commercial coconut shell activated carbon with a particle size of 6-16 mesh in quadruplicate, and added them to 500 mL [Pd (EN) 4 ] 2- In the alkaline cyanide solution, the concentration of the palladium solution was 22.73 mg / L, 40.18 mg / L, 61.36 mg / L and 76.32 mg / L respectively, and it was shaken and adsorbed on a Kang's oscillator for 4 hours, filtered, and the filtrate was used to determine the concentration of Pd ions. content. Calculate the [Pd(CN) of coconut shell activated carbon at different concentra...

Embodiment 3

[0035] Weigh 25.17 grams of commercial coconut shell activated carbon with a particle size of 6 to 16 mesh, and add it to 500 mL [Pt(CN) 4 ] 2 and [Pd(CN) 4 ] 2- In the mixed alkaline cyanide solution, wherein the concentration of platinum solution is 20.47 mg / L, and the concentration of palladium solution is 23.48 mg / L, vibrate and adsorb on a Kang's oscillator for 4 hours, filter, and filter out [Pt(CN)4 ] 2- and [Pd(CN) 4 ] 2- For coconut shell activated carbon, use 40 mL of desorption solution, including 8 mL of ethanol and 32 mL of 2wt% NaOH solution, heat at 97°C, and desorb for 6 hours. The results are shown in Table 3.

[0036] Table 3. Adsorption and Elution Experiment Ⅰ

[0037]

[0038] As can be seen from Table 3, from the cyanide solution of low concentration platinum and palladium, the adsorption rate of enriching platinum and palladium with activated carbon adsorption can be greater than 99%. 82.9% and 91.2%.

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Abstract

The invention discloses a method for enriching platinum and palladium from a pressurized cyanating solution, and belongs to a process for extracting platinum and palladium from a basic cyanating solution. The method comprises the steps as follows: enriching [Pt(CN)4]2- and [Pd(CN)4]2- from the pressurized cyanating solution of a platine group metal concentrate by cocoanut active charcoal; using a basic ethanol solution as a stripping solution for stripping the [Pt(CN)4]2- and the [Pd(CN)4]2- adsorbed on the surface of the cocoanut active charcoal; adsorbing and stripping for multiple times; burning the cocoanut active charcoal free of adsorption capacity; dissolving by acid; recovering platinum and palladium; and combining with platinum and palladium in the stripping solution. The method is easy and convenient to operate; the cocoanut active charcoal can be purchased in the market and is repeatedly utilized when in use; and the recovery rates of platinum and palladium are larger than 99%.

Description

technical field [0001] The invention belongs to the field of precious metal metallurgy, in particular to a process for extracting platinum and palladium from alkaline cyanide solution. Background technique [0002] The Jinbaoshan Platinum-Palladium Mine in Midu County, Yunnan Province is the platinum group metal deposit whose reserves have been found to be the second largest in the country so far. In 2001, the patent applicant proposed to directly carry out oxygen pressure acid leaching of the Jinbaoshan flotation concentrate The new all-wet process has received strong support from the Yunnan Provincial Development and Reform Commission and the Yunnan Provincial Science and Technology Department. By the time of the acceptance inspection by the expert group in 2004, the expanded test of batch processing of 5 Kg flotation concentrate with a 50-liter autoclave had been completed. The new process was authorized by Chinese patent on January 4, 2006 (name of invention: extraction ...

Claims

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Application Information

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IPC IPC(8): C22B3/24C22B11/00
CPCY02P10/20
Inventor 陈景黄章杰
Owner YUNNAN UNIV
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