Method for efficiently and rapidly recovering platinum and palladium from silver electrolysis post-solution

Abstract

The invention discloses a method for efficiently and rapidly recovering platinum and palladium from silver electrolysis liquid, and belongs to the technical field of metallurgy and chemical engineering. According to the method, platinum and palladium in the silver electrolysis post-solution are adsorbed through activated carbon, and then the platinum and palladium concentrate with the mass percentage being 60-80% is obtained after incineration is conducted at the temperature of 1000-1300 DEG C. The method not only can solve the problem that platinum and palladium elements exceed the standard in the silver ingot production process, but also efficiently and quickly recovers platinum and palladium resources in the silver electrolysis post-solution in a low-cost mode, and has the advantages of being low in cost, short in process, high in recovery rate and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy and chemical industry, and in particular relates to a method for efficiently and quickly recovering platinum and palladium from silver electrolysis liquid. Background Art

[0002] With the increasing scarcity of precious metal platinum and palladium resources and their important applications in industry, how to efficiently recover platinum and palladium from the liquid after silver electrolysis has become a technical problem that needs to be solved urgently. Silver refining mainly adopts electrolytic refining, and its electrolyte is silver nitrate solution. During the silver electrolysis process, platinum and palladium resources are dispersed from the silver anode plate into the electrolyte and anode mud, of which about 30% of platinum and palladium exist in the electrolyte, accompanied by Cu 2+ , Pb 2+ 、Bi 3+ , Sb 3+ Plasma accumulates in the silver electrolyte. As the electrolytic reaction continues, the platinum and palladium ions in the electrolyte are reduced and enter the silver powder product, causing the palladium content in the silver powder to exceed the standard, thereby affecting the quality of silver. This not only reduces the quality of the silver product, but also leads to a waste of platinum and palladium resources. Therefore, the development of efficient and low-cost platinum and palladium recovery technology has become a research hotspot in the field of precious metal resource recycling. Summary of the invention

[0003] In view of the shortcomings of the above-mentioned prior art, the present invention provides a method for efficiently and quickly recovering platinum and palladium from the liquid after silver electrolysis, which can not only effectively reduce the loss of platinum and palladium and improve the recovery rate of precious metals, but also provide higher resource utilization efficiency for the silver electrolysis process, which has important economic and environmental significance.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A method for efficiently and quickly recovering platinum and palladium from silver electrolysis solution comprises the following steps:

[0006] Add activated carbon to the liquid after silver electrolysis and stir for adsorption. After the reaction is completed, separate the solid and liquid to obtain adsorption slag a and adsorption liquid b; burn the adsorption slag a to obtain platinum-palladium concentrate.

[0007] As a preferred embodiment of the present invention, the solid-to-liquid ratio of the activated carbon to the silver electrolyzed liquid is 1-50 g / L.

[0008] As a preferred embodiment of the present invention, the stirring adsorption is for 0.5-4h.

[0009] As a preferred embodiment of the present invention, the incineration temperature is 1000-1300°C and the time is 0.5-4h.

[0010] Compared with the prior art, the invention has the following beneficial effects: the invention absorbs platinum and palladium in the liquid after silver electrolysis by activated carbon, and then obtains a platinum and palladium concentrate containing 60-80% of platinum and palladium by mass after incineration. The invention can not only solve the problem of excessive platinum and palladium elements in the process of producing silver ingots, but also recover platinum and palladium resources in the liquid after silver electrolysis in a low-cost manner, and has the advantages of low cost, short process, high recovery, etc. DETAILED DESCRIPTION

[0011] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0012] Example 1

[0013] A method for efficiently and quickly recovering platinum and palladium from silver electrolysis solution comprises the following steps:

[0014] Take 1L of silver electrolysis liquid, add 50g of platinum-palladium adsorption activated carbon, stir and adsorb for 3h, wait for the reaction to end, separate the solid and liquid to obtain adsorption slag a and adsorption liquid b; burn the adsorption slag a in a silver separation furnace at 1200℃ for 2h to obtain a platinum-palladium concentrate containing 80% platinum-palladium by mass.

[0015] Example 2

[0016] A method for efficiently and quickly recovering platinum and palladium from silver electrolysis solution comprises the following steps:

[0017] Take 1L of silver electrolysis liquid, add 1g of platinum-palladium adsorbed activated carbon, stir and adsorb for 0.5h, wait for the reaction to be completed, separate the solid and liquid to obtain adsorption slag a and adsorption liquid b; burn the adsorption slag a in a silver separation furnace at 1000°C for 4h to obtain a platinum-palladium concentrate containing 60% by mass of platinum-palladium.

[0018] Example 3

[0019] A method for efficiently and quickly recovering platinum and palladium from silver electrolysis solution comprises the following steps:

[0020] Take 1L of silver electrolysis liquid, add 20g of platinum-palladium adsorbing activated carbon, stir and adsorb for 4h, wait for the reaction to be completed, separate the solid and liquid to obtain adsorption slag a and adsorption liquid b; burn the adsorption slag a in a silver separation furnace at 1300℃ for 0.5h to obtain a platinum-palladium concentrate containing 71% of platinum-palladium by mass.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A method for efficiently and quickly recovering platinum and palladium from silver electrolysis solution, characterized in that: The steps include: Add activated carbon to the liquid after silver electrolysis and stir for adsorption. After the reaction is completed, separate the solid and liquid to obtain adsorption slag a and adsorption liquid b; burn the adsorption slag a to obtain platinum-palladium concentrate.

2. The method for efficiently and quickly recovering platinum and palladium from silver electrolysis solution according to claim 1, characterized in that: The solid-to-liquid ratio of the activated carbon to the silver electrolyzed liquid is 1-50 g / L.

3. The method for efficiently and quickly recovering platinum and palladium from silver electrolysis solution as claimed in claim 1, characterized in that: The stirring adsorption is performed for 0.5-4h.

4. The method for efficiently and quickly recovering platinum and palladium from silver electrolysis solution as claimed in claim 1, characterized in that: The incineration temperature is 1000-1300° C. and the time is 0.5-4 hours.