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Platinum, palladium and rhodium extraction and separation method through sugar separation induced three liquid phase system

A three-liquid phase, platinum-palladium technology, applied in chemical instruments and methods, ruthenium/rhodium/palladium/osmium/iridium/platinum compounds, inorganic chemistry, etc., can solve the problem of easy-to-corrosion equipment, difficult to regenerate and reuse, polymer polymerization High cost of phase formation and other problems, to achieve the effect of high separation selectivity and simplified process flow

Inactive Publication Date: 2014-12-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for extracting and separating platinum, palladium and rhodium in a three-phase system induced by sugar precipitation, which solves the problem that the existing three-phase extraction and separation of metal ions requires the use of high-concentration strong electrolyte salts, easy-to-corrosion equipment, and the use of high-molecular polymer components. Phase cost is high, difficult to regenerate and reuse

Method used

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  • Platinum, palladium and rhodium extraction and separation method through sugar separation induced three liquid phase system

Examples

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Effect test

Embodiment 1

[0041] Dissolve platinum, palladium and rhodium chlorides with 5 mL of aqueous hydrochloric acid with a concentration of 1 mol / L to prepare a metal mixed solution containing platinum, palladium and rhodium ions, with metal ion concentrations of 100 mg / L. Add 10mL of pure acetonitrile and mix well. Then 1.2 g of glucose was added to this mixture. Then add 5mL S201-dodecane organic mixed solution, the weight percent concentration of S201 in dodecane is 30wt%. Control the temperature at 15°C, shake and mix thoroughly. Then the mixture is subjected to centrifugation to obtain a three-liquid-phase coexistence system of upper, middle and lower layers which are mutually immiscible and clear and separated. Get upper, middle and lower three phases and measure palladium, platinum, rhodium concentration respectively, calculate palladium, platinum, rhodium respectively in the mass percentage of upper, middle and lower three phases account for the mass percent in the initial water phase ...

Embodiment 2

[0043] Dissolve platinum, palladium and rhodium chlorides with 10 mL of hydrochloric acid aqueous solution with a concentration of 3 mol / L to prepare a metal mixed solution containing platinum, palladium and rhodium ions, and the concentration of metal ions is 500 mg / L. Add 10mL of pure acetonitrile and mix well. Then 2.0 g of sucrose was added to the mixture. Then add 10mL S201-dodecane organic mixed solution, the weight percent concentration of S201 in dodecane is 50wt%. Control the temperature at 10°C, shake and mix well. Then the mixture is subjected to centrifugation to obtain a three-liquid-phase coexistence system of upper, middle and lower layers which are mutually immiscible and clear and separated. Get upper, middle and lower three phases to measure palladium, platinum, rhodium concentration respectively, calculate palladium, platinum, rhodium respectively in the mass percent of the mass percent of upper, middle and lower three phases in the initial water mixed met...

Embodiment 3

[0045] Dissolve platinum, palladium, and rhodium chlorides with 10 mL of hydrochloric acid aqueous solution with a concentration of 1 mol / L, and prepare a metal mixed solution containing platinum, palladium, and rhodium ions, and the metal ion concentration is 200 mg / L. Add 30mL of pure acetonitrile and mix well. Then add 2.0 g of galactose to this mixture. Then add 10mL S201-dodecane organic mixed solution, the weight percent concentration of S201 in dodecane is 50wt%. Control the temperature at 18°C, shake and mix thoroughly. Then the mixture is subjected to centrifugation to obtain a three-liquid-phase coexistence system of upper, middle and lower layers which are mutually immiscible and clear and separated. Get upper, middle and lower three phases and measure palladium, platinum, rhodium concentration respectively, calculate palladium, platinum, rhodium respectively in the mass percent of the mass percent of upper, middle and lower three phases in the initial aqueous mix...

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Abstract

A platinum, palladium and rhodium extraction and separation method through a sugar separation induced three liquid phase system belongs to the technical field of platinum, palladium and rhodium solvent extraction and separation. A technology comprises steps of: dissolving a certain volume of pure acetonitrile to aqueous solution containing platinum ion, palladium ion and rhodium ion; adding a certain weight of sugar into a mixing solution from the last step; adding a certain volume of a palladium selective organic extractant into the mixing aqueous solution, and fully oscillating and mixing at a certain temperature; centrifuging an obtained mixture to obtain an upper, middle and lower layer liquid phase coexisting system; carrying out back extraction on the upper phase to obtain palladium; removing acetonitrile with a lower boiling in the middle phase through a reduced pressure distillation to recover platinum from a steam residual; recovering rhodium from the lower phase. The invention has advantage of solving difficulties that high-density strong electrolyte salt used in a prior three phase extraction and separation of metal ions is apt to corroding equipment, and a high-molecular polymer used in forming phase has high costs and is had to be regenerated and reused, etc.

Description

technical field [0001] The invention belongs to the technical field of solvent extraction and separation of platinum, palladium and rhodium, in particular to a method for extracting and separating platinum, palladium and rhodium in a three-phase system induced by sugar precipitation. Background technique [0002] Solvent extraction is the most effective method for separation and purification of platinum, palladium and rhodium. Compared with the traditional precipitation and replacement methods, the separation and purification of platinum, palladium and rhodium by solvent extraction has obvious advantages: such as simple process, short cycle, fast reaction speed, high direct metal recovery rate, adaptability to various materials and Strong flexibility, low energy consumption and processing costs, easy operation and amplification, large-scale continuous production and automatic control can be realized. Therefore, the separation and purification of platinum, palladium and rhod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G55/00
Inventor 黄焜张超刘会洲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI