A method for efficiently separating and purifying palladium and rhodium from alloy flakes containing palladium and rhodium alloy

A technology of alloy flakes, tetraaminopalladium combined with palladium tetrachloride, applied in the field of efficient separation and purification of palladium and rhodium, can solve problems such as long time consumption, poor effect, large consumption of acid-base reagents, etc. The effect of clear parameters and fast filtering rate

Active Publication Date: 2020-11-10
KANFORT JIANGMEN ENVIRONMENTAL TECH CO LTD
View PDF15 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the purification of palladium to 99.95% requires repeating steps ③→⑤2-3 times to achieve, resulting in a large amount of waste water; if the raw material contains many impurity elements, step ③ will generate a large amount of sediment, which is large in size, suspended or floating In the solution, it forms a paste, entrains palladium, and the filtration speed is slow when filtering. After filtration, a large amount of palladium remains in the filter residue. The distribution ratio of palladium in the filter residue to the filtrate is between 4:6-2:8. One-time separation and purification of palladium The effect is poor, and the filter residue needs to repeat steps ①-⑦ many times to reduce the palladium content in the residue to below 1%.
This method is currently the most common method used in the industry. It not only takes a long time, consumes a lot of acid-base reagents, but also has a large amount of wastewater and a low recovery rate.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for efficiently separating and purifying palladium and rhodium from alloy flakes containing palladium and rhodium alloys,

[0028] Step 1: Put 10kg of alloy flakes containing palladium and rhodium alloys into a titanium reactor, add 4 times the volume of aqua regia solution, heat to 90°C with stirring, and react for 1 hour; after cooling to room temperature, filter the solution to obtain filtrate M, filter residue S;

[0029] Step 2: Transfer the filtrate M to a glass reactor, under stirring, slowly add 1.6kg of potassium permanganate solid, and react for 0.4h; then add 1kg of ammonium chloride solid, stir for 0.5h, and stand for 0.5h to obtain Red powder precipitate, said red powder precipitate is four amino palladium and palladium tetrachloride, and all metal elements other than palladium are left in the solution;

[0030] Step 3: filter the solution obtained in step 2, wash the tetraaminopalladium palladium tetrachloride with 36wt% concentrated hydrochloric...

Embodiment 2

[0039] A method for efficiently separating and purifying palladium and rhodium from alloy flakes containing palladium and rhodium alloys,

[0040] Step 1: Put 10kg of alloy flakes containing palladium and rhodium alloys into a titanium reaction kettle, add 4 times the volume of aqua regia solution, heat to 93°C with stirring, and react for 1.5h; after cooling to room temperature, filter the solution to obtain the filtrate M , filter residue S;

[0041] Step 2: Transfer the filtrate M to a glass reactor, under stirring, slowly add 2kg of potassium permanganate solid, and react for 0.5h; then add 1.3kg of ammonium chloride solid, stir for 0.7h, and stand for 0.5h to obtain Red powder precipitate, said red powder precipitate is four amino palladium and palladium tetrachloride, and all metal elements other than palladium are left in the solution;

[0042] Step 3: filter the solution obtained in step 2, wash the tetraaminopalladium palladium tetrachloride with 36wt% concentrated h...

Embodiment 3

[0051] A method for efficiently separating and purifying palladium and rhodium from alloy flakes containing palladium and rhodium alloys,

[0052] Step 1: Put 10kg of alloy flakes containing palladium and rhodium alloys into a titanium reactor, add 4 times the volume of aqua regia solution, heat to 95°C with stirring, and react for 2 hours; after cooling to room temperature, filter the solution to obtain the filtrate M, filter residue S;

[0053] Step 2: Transfer the filtrate M to a glass reactor, under stirring, slowly add 2.5kg of potassium permanganate solid, react for 0.8h; then add 1.5kg of ammonium chloride solid, stir for 1h, and stand for 0.5h to obtain Red powder precipitate, said red powder precipitate is four amino palladium and palladium tetrachloride, and all metal elements other than palladium are left in the solution;

[0054] Step 3: filter the solution obtained in step 2, wash the tetraaminopalladium palladium tetrachloride with 36wt% concentrated hydrochlori...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for efficient separation and purification of palladium and rhodium from an alloy sheet containing palladium-rhodium alloy. The method comprises the steps that the palladium-rhodium alloy sheet is dissolved with a nitromurlatic acid solution, then palladium is dissolved in the nitromurlatic acid solution, while rhodium resistant to corrosion from the nitromurlatic acid solution is not dissolved and deposits at the bottom of a container in the form of fine powder, so that palladium and rhodium are separated; potassium permanganate and ammonium chloride are added into the solution containing palladium, so that red palladium sediment is obtained to realize purification, and then a chemical reagent is added to generate dichlorodiamminepalladium which is used as araw material for synthesizing tetraamminepalladium sulfate; and the insoluble rhodium is roasted together with sodium peroxide and is then soaked in acid to be dissolved to obtain rhodium-containingliquor, and rhodium powder with the purity of 99.95% is obtained after purification and reduction.

Description

technical field [0001] The invention belongs to the field of metallurgy of platinum group metals, in particular to a method for efficiently separating and purifying palladium and rhodium from alloy flakes containing palladium and rhodium. Background technique [0002] Both palladium and rhodium metals belong to the platinum group metals and have many unique and superior physical and chemical properties. They have important special applications in the electronics industry, military industry and aerospace industry and cannot be replaced by other metals or materials. They have been honored as " "Modern industrial vitamin" and "the first high-tech metal", so it is of great significance to the recovery of platinum group metals. Due to their special physical and chemical properties, platinum and rhodium metals have strong corrosion resistance to acid and alkali, and it is difficult to dissolve them with a single acid or alkali, which also brings certain difficulties to their recyc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B7/00
CPCC22B7/006C22B11/04Y02P10/20
Inventor 李三梅朱振华蒋发权何天阳
Owner KANFORT JIANGMEN ENVIRONMENTAL TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap