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Method for recovery of precious metal from functionalised absorption materials containing precious metals

A precious metal and functionalization technology, which is applied in the field of precious metal recovery, can solve the problems of lower efficiency and insufficient effective quantitative removal of precious metals, etc.

Inactive Publication Date: 2012-09-19
HERAEUS PRECIOUS METALS GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this has the problem in particular of the rapid passivation of the surface of the metal particles to be dissolved by the formation of colloidal sulfur, which drastically reduces the efficiency of the process
With regard to the use of silica gel-based scavenger materials, such as described in EP-A-1576200 or US 4,360,380, direct leaching by treatment with oxidizing acids is not sufficiently effective for the quantification of adsorbed precious metals due to the high silica gel content remove

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] Burn 56.9 g of scavenger loaded with 1.60% by weight rhodium at 800° C. in an air environment (using PhosphonicS manufactured by Strem Chemicals, Inc., USA). TM 16-0650 product) and unidentified residual residues from organic treatment residues from homogeneous catalytic treatment for 8 hours in order to remove all organic components. A total of 25.5 g of ashes containing silica gel are obtained, which corresponds to a loss on ignition of 55%. The residual carbon content was 1.6%, and the Rh content was analyzed to be 3.56% (0.91g).

example 2

[0043] 25 g of rhodium-containing ash obtained analogously to Example 1 were heated to 180° C. for 4 hours in the presence of 250 ml of 45% sodium hydroxide solution and 1 g of sodium formate in an autoclave. The samples were then allowed to cool and the suspended solution was decanted. The suspension solution contains <1 mg / l rhodium. The residue on the Nutsch filter was washed with water and allowed to dry. The concentrated residue was analyzed to weigh 0.5 g.

example 3

[0045] 18.5 g of rhodium-containing ash obtained analogously to Example 1 were heated to 180° C. for 8 hours in the presence of 185 ml of 45% sodium hydroxide solution and 1 g of sodium formate in an autoclave. The samples were then allowed to cool and the suspended solution was decanted. The suspension solution contains <1 mg / l rhodium. The residue on the Nutsch filter was washed with water and allowed to dry. The concentrated residue was analyzed to weigh 3.8 g.

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PUM

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Abstract

The invention refers to a method for recovery of precious metal from a mixture containing precious metals, comprising the steps of: (i) providing a noble metal-containing composition containing an adsorption agent that is based on an inorganic material and is functionalized by organic groups and has at least one noble metal adsorbed to it; (ii) ashing of the noble metal-containing composition provided in step (i) in order to adjust a residual carbon content of at most 10% by weight, relative to the total weight of the noble metal-containing composition after ashing, to obtain an ashed composition; (iii) at least partially dissoluting the ashed composition obtained in (ii) in an alkaline aqueous solution to obtain a noble metal-containing residue; (iv) at least partially dissoluting the residue in the noble metal-containing residue obtained in (iii) to obtain an aqueous salt solution; and (v) optionally recovering the noble metal by reducing the noble metal salt obtained in (iv).

Description

technical field [0001] The present invention relates to a method for recovering precious metals from precious metal-containing mixtures. Background technique [0002] Precious metal-containing residues are obtained in many industrial processes, the precious metal content of which is high enough to warrant recovery in an economically reasonable manner. The residues are, for example, slurries containing noble metal-containing catalyst residues, dross, polishing dust, product residues, etc. from the plant. [0003] Many methods are known for recovering the precious metals contained in the mixture. A very commonly used method and also characterized by being very efficient is the so-called cyanide leaching, which is used in particular for gold recovery. In this case, a sodium cyanide or potassium cyanide leach is added to the gold-containing mixture, thereby dissolving the gold and some other precious metals contained therein in the leach. In the case of gold, the gold is ioni...

Claims

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Application Information

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IPC IPC(8): C22B11/00
CPCC22B11/044Y02P10/20B01J20/10C01G7/00C01G55/00
Inventor 约阿希姆·克拉里克马丁·施泰特纳斯特凡妮·富克斯·阿拉梅达
Owner HERAEUS PRECIOUS METALS GMBH & CO KG