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Thiorhodanine reagent and application thereof in solid-phase extraction of palladium

A solid-phase extraction column and reagent technology, applied to thiorhodanine reagents and its application in palladium solid-phase extraction, can solve the problems of low extraction recovery, high extraction cost, and low enrichment factor, Achieve high extraction recovery rate, high enrichment multiple, and overcome the effect of easy emulsification

Inactive Publication Date: 2012-06-20
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Researchers have been developing different extraction materials to solve the problems of low enrichment factor, high extraction cost, low extraction recovery rate, and large environmental pollution in existing technologies.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1:The solid-phase extraction column used was 10 mm×10 mm, filled with 1.2 g of filler (graphitized carbon black loaded with MCPATR); the liquid to be extracted was hydrochloric acid and sodium chlorate leaching solution of waste circuit boards, and the concentration of palladium was 5.21 mg / L, the solution was passed through the column at a flow rate of 20 mL / min, and the column volume was 1.2 L. After enrichment, 5.0 mL of 1% thiourea was used in the reverse direction to elute the palladium enriched on the small column. Under this condition, the enrichment factor can reach 240 times, and the recovery rate of palladium can reach 97.0%. The palladium in the eluent is smelted and recovered by conventional methods.

Embodiment 2

[0029] Example 2: The solid phase extraction column used was: 10 mm×10 mm, filled with 1.2 g of filler (graphitized carbon black with complexing agent); the solution to be extracted was the leaching solution of cyanide tailings, the palladium concentration was 1.2 mg / L, and the pH was adjusted to 1.2 mg / L. was 0.8, and the column volume was 4.0 L. After the enrichment, 5 mL of 1.5% thiourea was used to elute the palladium enriched on the small column in the reverse direction. Under this condition, the enrichment factor can reach 800 times, and the recovery rate of palladium can reach 96.8%. The palladium in the eluent is smelted and recovered by conventional methods.

Embodiment 3

[0030] Example 3: The solid phase extraction column used is: 10 mm×10 mm, filled with 1.2 g of filler (graphitized carbon black with complexing agent); the liquid to be extracted is palladium ore leaching liquid, containing 15.4 mg / L palladium, and the pH is adjusted to 1.2; The solution was passed through the column at a flow rate of 15 mL / min, and the column volume was 1.5 L. After enrichment, 5 mL of 0.8% thiourea was used to elute the enriched palladium on the small column in the reverse direction. Under this condition, the enrichment factor can reach 300 times, and the recovery rate of palladium can reach 97.5%. The palladium in the eluent is smelted and recovered by conventional methods.

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Abstract

The invention discloses a novel thiorhodanine reagent 5-(2-methyl-4-carboxylphenyl)-azo-thiorhodanine a method for preparing a graphitized carbon black solid-phase extraction column loaded with the thiorhodanine reagent, and the use of the solid-phase extraction column for solid-phase extraction of palladium. In solid-phase extraction, a palladium-containing solution flows through the solid-phase extraction column, palladium can react with the reagent loaded on the solid-phase extraction column to produce a stable complex compound so that palladium is adsorbed on the solid-phase extraction column, palladium is enriched on the solid-phase extraction column until saturated, and then palladium on the solid-phase extraction column is eluted with 0.5 to 2% thiourea as eluent. The solid-phase extraction column has high palladium enrichment factor and large extraction capacity, and the reagent can be repeatedly used. The single-extraction rate of palladium can exceed 96.8%, the enrichment factor exceeds 400, and the palladium extraction capacity of the reagent is more than 23.4 mg / g.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a new thiorhodanine reagent and its application in palladium solid-phase extraction. technical background [0002] Rhodanine reagents are an important class of organic analytical reagents. Scholars in the former Soviet Union synthesized rhodanine azo reagents and methylene rhodanine reagents, and synthesized thiorhodanine and its derivatives through thiolation , up to now rhodanine and thiorhodanine reagents have developed into a class of important photometric reagents, the reported reagent structure has reached more than 200 kinds, and are widely used in the photometric determination of precious metal elements. Since this kind of reagent has good complexing performance for noble metal elements, it is also widely used as an extraction reagent for noble metal elements. [0003] At present, the relatively new technology for the extraction of palladium is reversed-phase s...

Claims

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Application Information

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IPC IPC(8): C22B3/34C22B11/00C07D277/50
CPCY02P10/20
Inventor 胡秋芬李银科叶艳青羊波杨新周
Owner YUNNAN MINZU UNIV
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