Selective Metal Oxidation in Alloy Purification
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Solution Overview
Problem
Current methods for purifying precious and common metals from alloys are complex, costly, and environmentally unfriendly, often requiring frequent maintenance due to fouling by impurities, and lack efficient techniques for producing engineered metal/metal oxide compounds.
Innovation Solution
A method involving the selective oxidation of metals in alloys by melting and exposing the molten alloy to simultaneous fragmentation and burning in oxygen, under controlled conditions to achieve an oxidation potential that oxidizes target metals without affecting non-target metals, allowing for separation and collection of purified base metals or engineered metal compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional purification methods (firing, electro-chemistry, leaching) are used to separate precious metals from alloys, then metal purification can be achieved, but the process becomes complicated, expensive and environmentally unfriendly
Solution Approach 1:
The invention changes the oxidation potential parameter by controlling the oxygen atmosphere and heating conditions to selectively oxidize impurity metals while leaving the base metal unaffected. This parameter control enables simple selective oxidation without complex purification processes
Solution Approach 2:
The invention extracts impurity metals from the alloy by selective oxidation, converting them into metal oxides that can be easily separated from the base metal. This extraction approach simplifies the purification process compared to traditional multi-step methods
2Manufacturing precision
If traditional separation methods are used to recover precious metals from scrap, then metal recovery is achieved, but equipment requires frequent maintenance due to fouling by large amounts of impurities
Solution Approach 1:
The invention converts the harmful effect of impurity metals into a beneficial process by exploiting their different oxidation potentials. Impurity metals are selectively oxidized and removed, transforming them from problematic contaminants into separable oxide products that clean the equipment rather than fouling it
3Measurement precision
If reactive spray deposition is used for in-flight oxidation of metal, then metal oxide content can be determined, but the method has not been applied for producing engineered metal/metal oxide compounds or purifying precious metals
Solution Approach 1:
The invention makes the reactive spray deposition process universal by applying it to multiple functions: determining metal oxide content, producing engineered metal/metal oxide compounds with controlled compositions, and purifying precious metals from alloys. The same basic process achieves different objectives by adjusting parameters
4Manufacturing precision
If selective oxidation conditions are controlled to oxidize target metals without affecting non-target metals, then high purity base metal can be obtained, but the process requires precise control of oxidation potential
Solution Approach 1:
The invention uses parameter changes in oxidation potential by controlling oxygen atmosphere composition and heating temperature to achieve selective oxidation. The oxidation potential is adjusted to a specific range that oxidizes impurity metals while leaving the base metal unaffected, enabling high purity production
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 method effectively purifies base metals from alloys, achieving high purity levels (>90%) while being environmentally friendly and reducing maintenance costs, with the ability to produce metal compounds with predetermined oxide content.
Implementation Method 1
exposing the molten alloy to simultaneous fragmentation and burning in the presence of oxygen under conditions sufficient to yield an oxidation potential that oxidizes one or more target metals in the alloy
Data Source
AI summary
A method of selectively oxidizing one or more target metals in an alloy comprising target and non-target metals is provided. The method comprises the steps of: i) melting the alloy and exposing the molten alloy to simultaneous fragmentation and oxidation in the presence of an oxygenated atomizing gas under conditions sufficient to yield an oxidation potential that oxidizes the one or more target metals in the alloy and does not oxidize the non-target metal(s); and ii) allowing the treated alloy to solidify. The method is useful to purify a non-target base metal. The method is also useful to produce a metal compound comprising a desired content of one or more oxidized target metals above the theoretical maximum generally achieved by thermal plasma spray surface coating applications.