Process for extracting, separating and purifying Ag, Au, Pd and Pt

An optimal and precious metal technology, applied in the direction of improving process efficiency, etc., can solve the problems of cumbersome treatment process, difficult platinum refining connection, large dissolution loss, etc.

Inactive Publication Date: 2010-06-23
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing technology is cumbersome
[0017] International Nickel Corporation (Inco) Acton (Acton) extracts gold (DBC) with dibutyl carbitol (DBC), extracts palladium with sulfide, and then extracts platinum with tributyl phosphate (TBP). Since TBP has certain water solubility, it dissolves The loss is large; when the stripping solution is acidified and concentrated, a large amount of sodium chloride crystallizes out, which is not easy to connect with the refining of platinum

Method used

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  • Process for extracting, separating and purifying Ag, Au, Pd and Pt
  • Process for extracting, separating and purifying Ag, Au, Pd and Pt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: The precious metal liquid composition is as follows

[0025] components

[0026] Take 1L of the above precious metal solution, adjust the acidity to 2.5mol / L hydrochloric acid, extract with 1LDBC for 5min, separate the water phase, wash the organic phase with 0.5mol / L hydrochloric acid; separate the water phase, and use 5% oxalic acid solution for the organic phase Restore at 80°C for 2 hours to obtain golden sponge gold, the gold extraction rate is 99.99%, and the recovery rate is 99.9%; the water phases are combined, the water and acid are evaporated, the acidity is adjusted to 0.1mol / L hydrochloric acid, and 1L of 15% DOS xylene solution is used Extract palladium, mix the phases for 5 minutes, and the palladium extraction rate is greater than 99.99%. The aqueous phase was separated, and back-extracted with 3mol / L ammonia water, the stripping rate was 96%, the aqueous phase was reduced with hydrazine hydrate to obtain pure palladium, the organi...

Embodiment 2

[0027] Embodiment 2: The composition of precious metal liquid is as follows

[0028] components

[0029] Take 500ml of the above precious metal solution, adjust the acidity to 2.0mol / L hydrochloric acid, extract with 500ml DBC for 5min, separate the water phase, wash the organic phase with 0.5mol / L hydrochloric acid; separate the water phase, and use 5% oxalic acid solution for the organic phase Restore at 80°C for 2 hours to obtain golden sponge gold, the gold extraction rate is 99.99%, and the recovery rate is 99.9%; the water phases are combined, water and acid are evaporated, and the acidity is adjusted to 0.1mol / L hydrochloric acid, and 500ml 15% DOS xylene The solution extracts palladium, mixed phases for 5 minutes, and the palladium extraction rate is greater than 99.99%. The aqueous phase was separated, and back-extracted with 3mol / L ammonia water, the stripping rate was 96%, the aqueous phase was reduced with hydrazine hydrate to obtain pure palladium, the o...

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Abstract

The invention relates to a process for extracting, separating and purifying Ag, Au, Pd and Pt. The process comprises the following steps of: precipitating and separating Ag in the form of AgC1, then adding ammonia water for dissolving, reducing hydrazine hydrate to obtain Ag; extracting by using dibutyl carbitol, and back-extracting Au with 5 percent of oxalic acid with a direct acceptance rate of more than or equal to 99.9 percent; extracting Pd with n-octyl sulfur ether, wherein the extraction rate of palladium is more than or equal to 99.99 percent, and then back-extracting the palladium with 3mol/L ammonia water; and finally, extracting Pt with tri-n-octylamine, back-extracting platinum with alkaline water and reducing to obtain platinum.

Description

technical field [0001] The invention relates to a continuous production process operation method for extraction and separation of noble metals Ag, Au, Pd and Pt. Background technique [0002] Traditional precious metal separation uses aqua regia to dissolve precious metals, and then gradually selects and reduces precious metals; various precious metals need to be purified many times to obtain pure metals, and the yield is low; and a large amount of waste acid water is generated during the production process, and a large amount of waste gas is emitted. The requirements for protection are becoming more and more stringent, and these processes will be gradually eliminated. [0003] Aqua regia dissolution method: [0004] Au+HNO 3 +4HCl→HAuCl 4 +2H 2 O+NO [0005] Ag+2HNO 3 →AgNO 3 +H 2 O+NO 2 [0006] 3Pt+4HNO 3 +18HCl→3H 2 PtCl 6 +8H 2 O+4NO [0007] 3Pd+2HNO 3 +12HCl→3H 2 PdCl 4 +4H 2 O+2NO [0008] A large amount of NO, NO2 and other harmful gases are prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/40C22B11/00
CPCY02P10/20
Inventor 陶家林唐德金
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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