Bulk Ion Exchange for Copper Raffinate Metal Recovery
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Solution Overview
Problem
Current methods for recovering secondary critical metal values from copper SX-EW raffinates are economically inefficient due to the need for expensive, metal-specific ion exchange resins and high energy-intensive electrolysis, which are not viable for dilute concentrations and limited metal production.
Innovation Solution
A bulk ion exchange step using an inexpensive resin followed by selective extraction processes to concentrate and recover individual metal values from a copper SX-EW raffinate, involving a preliminary step to concentrate metals and subsequent selective extraction to produce high-value products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If metal-specific ion exchange resins are used to recover secondary critical metals from copper SX-EW raffinates, then recovery selectivity is improved, but process cost increases
Solution Approach 1:
The recovery process is divided into two distinct stages: (1) bulk concentration of multiple metals using inexpensive non-selective ion exchange resin, and (2) selective recovery of individual critical metals from the concentrated solution using metal-specific resins. This segmentation allows the expensive selective resins to work on a much smaller volume of concentrated metal solution rather than large volumes of dilute raffinate, thereby reducing overall process cost while maintaining high recovery selectivity.
Solution Approach 2:
A preliminary bulk concentration step is performed before the selective recovery step. The preliminary action involves passing the dilute copper SX-EW raffinate through a column containing non-selective ion exchange resin to concentrate multiple metals (including critical metals like scandium, cobalt, nickel, and molybdenum) into a smaller volume. This preliminary concentration increases the metal content by factors of 10-100x, making subsequent selective recovery economically viable.
2Quantity of substance
If electrolysis is used to recover metals from dilute solutions, then metal recovery is achieved, but energy consumption increases
Solution Approach 1:
Before subjecting the solution to energy-intensive electrolysis, a preliminary ion exchange concentration step is performed to concentrate the dilute metals into a much smaller volume with higher metal content. This preliminary action reduces the volume of solution requiring electrolysis by factors of 10-100x, thereby dramatically reducing the total energy consumption while achieving the same quantity of metal recovery.
3Quantity of substance
If conventional recovery methods are used for dilute metal concentrations, then metal recovery is possible, but economic viability deteriorates
Solution Approach 1:
The recovery process is segmented into bulk concentration and selective recovery stages, allowing inexpensive non-selective resins to handle the large volume of dilute raffinate first, followed by expensive selective resins working on a small volume of concentrated solution. This segmentation makes the overall process economically viable for recovering secondary critical metals from dilute copper SX-EW raffinates.
Solution Approach 2:
The process changes the concentration parameter of metals in the solution from dilute (original state) to concentrated (after ion exchange). This parameter change from dilute to concentrated state is achieved through the bulk ion exchange step, which increases metal content by 10-100x, thereby improving economic viability for subsequent selective recovery and sale of critical metals.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces costs and energy consumption by producing a more concentrated metal solution, enabling economic recovery of secondary critical metals in salable quantities through bulk concentration and subsequent selective extraction.
Implementation Method 1
processing the waste solution with an ion exchange resin which is selective to, and releasably binds, the plurality of secondary metals
Implementation Method 2
eluting the secondary metals from the ion exchange resin to produce a metal eluate
Data Source
AI summary
A method for extracting secondary metal values from a sulfuric acid leachate is provided. The method includes providing a leachate which contains a primary metal and a plurality of secondary metals, wherein the primary metal is selected from the group consisting of Cu, Li and Ni and is derived from sulfuric acid leaching of an ore; passing the leachate through a first ion exchange resin which is selective to, and releasably binds, the plurality of secondary metals; stripping the plurality of secondary metals from the second or third ion exchange resins, thereby obtaining a first extract; and recovering the secondary metals from the first extract.