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Process for recovery of precious metals

A precious metal and metal technology, applied in the field of element separation, can solve the problems of disappointment, non-quantitative, failure and other problems of ion exchange methods

Inactive Publication Date: 2011-10-12
METALS RECOVERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This proposed solvent extraction method has obvious limitations: it assumes that osmium and iridium have been removed by other methods, rhodium extraction is not quantitative, and Rh must be further processed to remove tin, possibly in a 10-fold molar excess
Ion-exchange methods for industrial-scale Rh recovery and purification have also yielded disappointing results or failed

Method used

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  • Process for recovery of precious metals
  • Process for recovery of precious metals
  • Process for recovery of precious metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0075] As illustrated graphically in Figure 1, several 200 gram samples of PM-containing solids from two groups with BM were refined. Typical conditions and results of those runs are summarized in Table 3.

[0076] Table 3. Mean Metal Concentrations in the Two Groups of Example A

[0077]

[0078] In Stage I, slurry the solids in approximately 1 L of 6N HCl at 110 °C while adding sufficient Cl 2 to dissolve PM. After cooling, unimportant solids and PbCl were separated by filtration 2 . The filtered solution was refluxed at about 110° C. for about 24 hours, resulting in the solution shown in Table 3 as Phase I. Add 300 grams of SQAS, optionally tetramethylammonium chloride and reflux at about 110°C for about an additional 24 hours. The refluxing solution was allowed to cool to room temperature over about 24 hours or longer, which produced a slurry. If excess SQAS precipitates with PM-SQAS, it does not interfere with subsequent processing. The slurry was separated by fil...

Embodiment B

[0084] As illustrated diagrammatically in FIG. 2 , highly concentrated PM elements and a hydrochloric acid solution of BM are processed to recover and refine PM. This starting material differs from Example A mainly due to the additional presence of Ru and Ir.

[0085] Table 4. Average Metal Concentrations of Starting Solutions in Example B

[0086] Rh

PD

Pt

Au

Cu

Fe

Ir

Ru

40,000

2,000

4,000

400

20,000

20,000

5,000

30,000

[0087] Rhodium, ruthenium and base metals are separated from other PM in stage I. Seventy grams of the liquid was heated at about 110°C for about 36 hours and then allowed to cool to room temperature. Dissolve 12 grams of SQAS (tetramethylammonium chloride) in the solution. with Cl 2 The solution was sprayed for approximately 70 minutes. Au-SQAS, Pt-SQAS, Pd-SQAS, Ir-SQAS and Fe(III)-SQAS precipitated while Rh, Ru and BM remained soluble. The precipitate wa...

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Abstract

The invention provides a process for recovery of the precious metals. A hydrometallurgical process for the recovery of metals selected from the group consisting of platinum, palladium, rhodium, ruthenium, iridium, and gold (PM) from solids includes dissolving the PM and base metals in an acidic halide aqueous solution and precipitating the PM using substituted quaternary ammonium salts (SQAS). PM having multiple oxidation states may be oxidized or reduced to separate through differential solubility. Au-SQAS is separated by washing the precipitate with a suitable organic solvent. Rh-SQAS and other PM with multiple oxidation states are dissolved in a strong halide acid solution and oxidized to separate soluble Rh. Pb and Pd are separated by boiling the initial acidic halide aqueous solution of metals in an excess of SQAS. The Pb and Pd filtrate is oxidized and then Pd-SQAS is dissolved in aqueous ammonia and separated from insoluble Pb. A slurry of Ir-SQAS and Pt-SQAS are separated through dissolution of Ir-SQAS with NaNO2.

Description

technical field [0001] The field of the invention is the separation process of elements. Background technique [0002] Recovery, separation and purification of valuable noble metals such as platinum [Pt], palladium [Pd], iridium [Ir], rhodium [Rh], ruthenium [Ru] and gold [Au] are typically tedious processes that require fire Repeated application of metallurgical, hydrometallurgical or electrowinning methods to achieve acceptable metal recovery and metal purity. Most source materials such as ores, spent catalysts, electroplating baths, metal scraps (residues), concentrates, and smelter mattes are chemically complex not only because of the diversity of precious metal elements but also because of the abundance of non-precious metals. For some elements, especially rhodium, recovery, purification and isolation of the precious metal elements from these source materials is very difficult, time consuming, expensive and unsatisfactory. [0003] Noble metal chemistry is extremely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCC22B3/10C22B3/44C22B3/46C22B11/04Y02P10/20
Inventor J·L·托马斯G·F·布雷姆
Owner METALS RECOVERY TECH