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Method for separating platinum and rhodium from alkaline cyanide solution by using polystyrene-tributyl quaternary phosphonium resin

A technology of tributyl quaternary phosphine and polystyrene, which is applied in the field of separating platinum and rhodium, can solve the problems of no industrial-scale application, small adsorption capacity, and long equilibrium time, and achieve easy control of adsorption and separation conditions and high adsorption capacity Large and good adsorption effect

Active Publication Date: 2019-02-26
YUNNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the alkaline cyanide solution medium, Rh and Pt are respectively with CN - Formation of stable Rh(CN) 6 3- and Pt(CN) 4 2- Ions, at present, the separation of platinum and rhodium from alkaline cyanide solution mainly adopts base metal replacement method and adsorption separation method. The base metal replacement method needs to destroy the cyanide in the solution first. Rh(CN) in 6 3- and Pt(CN) 4 2- The concentration should not be too low, it is not suitable for processing low-concentration feed liquid
The adsorption separation method has received extensive attention in the field of platinum group metal separation technology because of its simple equipment, short separation cycle, less environmental pollution, and suitable for processing low-concentration feed liquids. Adsorbents for compound extraction such as activated carbon, MOFs materials, various inorganic materials, etc. have many problems such as small adsorption capacity, poor selectivity, long equilibration time, and difficult elution, so the application scale is limited. Rh(CN) in medium 6 3- and Pt(CN) 4 2- No industrial-scale application has been achieved so far

Method used

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  • Method for separating platinum and rhodium from alkaline cyanide solution by using polystyrene-tributyl quaternary phosphonium resin
  • Method for separating platinum and rhodium from alkaline cyanide solution by using polystyrene-tributyl quaternary phosphonium resin
  • Method for separating platinum and rhodium from alkaline cyanide solution by using polystyrene-tributyl quaternary phosphonium resin

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Experimental program
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Effect test

Embodiment 1

[0025] Immobilization of Rh(CN) under different pH conditions at room temperature 6 3- The concentration of Rh(III) in the solution is 2.5g / L, the amount of PS-BQP in the stationary phase is 1.0g, the solid-liquid ratio is 1:100 (g / mL), shake for 30min, and filter out the loaded PS-BQP; measure Rh( III) Adsorption amount, pH value on PS-BQP adsorption of Rh(CN) 6 3- The impact is shown in Table 1.

[0026] Table 1. Effect of pH value on adsorption of Rh(CN) by PS-BQP 6 3- Impact

[0027]

[0028]

Embodiment 2

[0030] Immobilization of Pt(CN) under different pH conditions at room temperature 4 2- The concentration of Pt(II) in the solution is 3.0g / L, the amount of PS-BQP in the stationary phase is 1.0g, the solid-liquid ratio is 1:100 (g / mL), shaken for 30min, and the loaded PS-BQP is filtered out; Determination of Pt( II) Adsorption capacity, pH value on PS-BQP adsorption of Pt(CN) 4 2- The impact is shown in Table 2.

[0031] Table 2. Effect of pH value on adsorption of Pt(CN) by PS-BQP 4 2- Impact

[0032] pH value

[0033] It can be seen from Table 1 and Table 2 that the PS-BQP adsorbent has a wide range of pH in the range of 9.0 to 11.0 for Pt(CN) 4 2- and Rh(CN) 6 3- All have better adsorption effect.

Embodiment 3

[0035]At room temperature, weigh 1.0g resin as stationary phase, add to pH=10.5, 100mL Rh(CN) 6 3- In the solution, the concentration of Rh(III) was 2.5g / L, shaken for 30min, and the loaded PS-BQP was filtered out; the adsorption amount of Rh(III) was measured, and the filtered resin loaded with Rh(III) was added to 50mL at 1.0mol / In the L KCI solution, shake for 15min, filter out the PS-BQP in the desorption solution, wash the PS-BQP twice with distilled water, and absorb the same Rh(CN) again 6 3- solution, the measurement results of static adsorption capacity for 6 cycles are shown in Table 3.

[0036] Table 3. Determination of Cyclic Static Adsorption Capacity of Rh(III)

[0037] Cycles

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Abstract

The invention discloses a method for separating platinum and rhodium from an alkaline cyanide solution by using polystyrene-tributyl quaternary phosphonium resin (PS-BQP for short), and belongs to thetechnical field of platinum group metal separation. The method comprises the following steps: by taking the PS-BQP as an adsorbent, jointly adsorbing Pt(CN)42<-> and Rh(CN)63<-> in an alkaline cyanide solution medium with a pH being equal to 9.0 to 11.0 and at a solid-liquid ratio being 1:100 (g / mL); performing step-by-step elution on the adsorbed Pt(CN)42<-> and Rh(CN)63<-> according to a two-step elution method: firstly, using a KCI solution at a concentration of 0.5 to 1 mol / L to desorb the Rh(CN)63<-> adsorbed on the PS-BQP and then using an NH4SCN solution at a concentration of 1.0 to 1.5 mol / L to desorb the Pt(CN)42<-> adsorbed on PS-BQP, thereby achieving separation of the Pt(CN)42<-> and the Rh(CN)63<->. The method is simple in operation flow and short in separation period; the recovery rate of platinum is higher than 96.0%, and the recovery rate of ruthenium is higher than 95.0%; the adsorption capacity of the PS-BQP adsorbent is high, and the stability is good; the PS-BQP adsorbent can be repeatedly used after being regenerated by the saturated KCl solution.

Description

technical field [0001] The invention relates to a method for separating platinum and rhodium from alkaline cyanide solution by using polystyrene-tributyl quaternary phosphine resin (PS-BQP for short), belonging to the technical field of separation of platinum group metals. Background technique [0002] Platinum and rhodium belong to the platinum group metals, which are strategic resources in short supply in the country. They need to be imported in large quantities every year. Platinum and rhodium binary catalysts are widely used in the chemical industry. The content of platinum and rhodium in glass fiber industrial waste is much higher than that of platinum and rhodium concentrates The grade and the utilization value are huge. The recovery of platinum and rhodium secondary resources and the development of mine resources are equally important. The commonly used methods for leaching platinum and rhodium from secondary resources are chloride leaching and pressurized cyanide leac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/24C22B11/00
CPCC22B3/24C22B11/04Y02P10/20
Inventor 黄章杰陈慕涵叶群蒋绍松邵敏金次葛云松陈明军徐建琨
Owner YUNNAN UNIV
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