Solid phase extraction process for extracting and separating palladium

A solid-phase extraction agent and solid-phase extraction column technology, applied in the field of precious metal metallurgy, can solve problems such as being unsuitable for production and application, and achieve the effects of low cost, wide application range and good separation effect

Inactive Publication Date: 2007-08-22
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Use anion exchange resin to simultaneously adsorb Pd(II), Pt(IV), or simultaneously adsorb Pd(II), Rh(III) and Ir(IV), and then use two chemical reagent solutions (such as HCl and HClO 4 , NaOH and HNO 3 ) to elute platinum group metals separately is usually only used in analytical laboratories and is not suitable for production applications

Method used

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  • Solid phase extraction process for extracting and separating palladium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Chloropalladic acid (H 2 PdCl 4 ) Solution, made by dissolving metal palladium in aqua regia to remove nitrate and making H 2 PdCl 4 Solution, containing 7.724g / L of palladium, and the concentration of medium hydrochloric acid is 0.1mol·L -1 , Use the methylene bisacrylamide and vinyl imidazole polymer bonded with cetyl sulfide extractant as the stationary phase, the particle size is 250μm, this stationary phase is filled in a φ15mm×400mm glass column, the material liquid The volume is 60mL, the column flow rate is 4.0mL / min, the eluent is 0.1mol / L hydrochloric acid 30mL, the flow rate is 3.0mL / min, the eluent is 2% thiourea solution 100mL, the flow rate is 5mL / min, and the injection volume It is 100mL. The effect of extracting Pd is shown in Table 1:

[0017] Table 1 From chloropalladium acid (H 2 PdCl 4 ) The effect of extracting Pd in ​​solution

[0018] Element

Embodiment 2

[0019] Example 2: Weigh 5.00 g of 2,6-diacrylamide pyridine and diacrylamide-2-methyl-1-propanesulfonic acid polymer bound to the tetradecyl sulfoxide extractant as a stationary phase, and polymerize The particle size is 180μm, and it is added to 100mL hydrochloric acid solution containing 7.724g / L of palladium, shaken on a Conger shaker for 2h, filtered, and the content of metal Pd ions in the filtrate is determined. Calculate the static adsorption capacity of the polymer composite microsphere polymer for palladium.

[0020] Table 2 Determination of static adsorption capacity

[0021] Element

Embodiment 3

[0022] Example 3: The composition of the material liquid obtained from the platinum group metal concentrate is simulated to contain 3.752g / L of palladium, 5.019g / L of platinum, 0.562g / L of rhodium, 0.125g / L of iridium, 1.254g / L of copper, and iron. The test was carried out on synthetic samples of 1.221g / mL, zinc 1.192g / mL and nickel 0.832g / mL. Use pentaerythritol trimethacrylate bonded with n-hexadecyl sulfide and 4-styryl-nitrosodiacetic acid polymer as the stationary phase, the particle size is 550μm, and the size of the solid phase extraction column is φ15mm×400mm; The injection volume is 32.00 mL, the medium hydrochloric acid concentration is 0.1 mol / L, the feed liquid flow rate is 3 ml / min, the eluent is 0.1 mol / L hydrochloric acid 20 mL, the flow rate is 3.0 mL / min, and the eluent is 2% thiourea solution 50mL, the flow rate is 3mL / min, the solid phase extraction column is regenerated with 40mL of 0.1mol / L hydrochloric acid.

[0023] Table 3 Separation test results of palladi...

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Abstract

The solid phase palladium extracting and separating process for extracting and separating palladium from platinum metal concentrate or secondary noble metal enriching material features that palladium is separated from platinum, rhodium, iridium and base metals Cu, Ni, Fe, etc by means of polymer microsphere with bonded palladium extractant as fixing phase, hydrochloric acid solution containing metals as the flowing phase, dilute hydrochloric acid solution as the leaching solution and reagent solution capable of being complexed with palladium as the eluting liquid. The solid phase extracting column may be regenerated with dilute hydrochloric acid solution for reuse. The process of the present invention has high separating effect, high platinum, palladium and rhodium recovering rate, low cost and other advantages.

Description

1. Technical field [0001] The method for extracting and separating palladium by solid phase extraction relates to the field of precious metal metallurgy. . 2. Background technology [0002] For the mutual separation of platinum group metals and the separation of platinum group metals from copper, iron, nickel and other base metals, the methods currently used in production practice at home and abroad include precipitation, solvent extraction, and ion exchange. Each of these methods has its own characteristics. Depending on the composition of the material and the content of the composition, each method has certain limitations. With regard to the extraction and separation of palladium, the following methods are commonly used in the production process: [0003] (1) Precipitation method: Precipitate Pt(IV) with ammonium chloride to generate (NH 4 ) 2 PtCl 6 Precipitation, Pd(II), Rh(III) and Ir(III) remain in solution; use sodium ethylxanthate (xanthate) or Na 2 S, control the amount ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/26C22B11/06
CPCY02P10/20
Inventor 黄章杰陈景韦群燕谢琦莹
Owner YUNNAN UNIV
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