Vanadium Leach Feed Preparation via Reduction and Ferric Leaching
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Solution Overview
Problem
Traditional methods for extracting vanadium from titanomagnetite-type ores, such as pyrometallurgical processes, face challenges in optimizing performance and unlocking the full value of metals due to the co-extraction of iron, which increases operating costs and capital expenditure.
Innovation Solution
A method involving a reduction step using a carbon reductant like coke, followed by a ferric leach step with ferric chloride, and subsequent acid leach step using hydrochloric acid, to minimize iron content in the leach feed material, thereby improving vanadium extraction and recovery efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pyrometallurgical processes are used for extracting vanadium, then vanadium can be recovered, but iron content in the leach feed material increases leading to higher operating costs and capital expenditure
Solution Approach 1:
The extraction process is divided into separate stages: a first leaching step that selectively dissolves vanadium while leaving iron behind, followed by a second leaching step that recovers iron. This segmentation allows each metal to be processed optimally at different stages, resolving the contradiction between vanadium recovery and iron content control
Solution Approach 2:
The invention changes the chemical parameters of the leaching solution between steps. The first leaching uses specific conditions (pH, reagent type) that favor vanadium dissolution, while the second leaching adjusts parameters to enable iron dissolution. This parameter optimization ensures high vanadium extraction while minimizing iron carryover to the final feed material
2Reliability
If extensive optimisation is applied to pyrometallurgical processes, then vanadium recovery improves, but process complexity and costs increase
Solution Approach 1:
The invention extracts and removes iron from the system early in the process through selective leaching, separating it from the vanadium recovery pathway. This eliminates the need for extensive downstream optimisation and complex process adjustments, simplifying the overall process while maintaining high vanadium recovery
Solution Approach 2:
The first leaching step performs preliminary separation by selectively dissolving vanadium compounds while leaving iron compounds undissolved. This preliminary action prepares the material for subsequent processing, eliminating the need for extensive optimisation in later stages and reducing overall process complexity
3Manufacturing precision
If additional process steps are added to handle iron downstream, then vanadium purity improves, but operating costs and capital expenditure increase
Solution Approach 1:
The process segments iron and vanadium separation into distinct leaching steps, achieving high vanadium purity in the first step's output without requiring additional downstream iron removal processes. This segmentation eliminates the need for costly additional equipment and operations while maintaining manufacturing precision
Solution Approach 2:
The selective leaching chemistry is designed so that the first leaching step naturally produces a vanadium-rich solution with minimal iron contamination, and the second step naturally recovers iron. The process self-regulates through chemical selectivity, eliminating the need for additional purification steps and reducing both operating costs and capital expenditure
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 effectively reduces iron content, enhancing the quality of the leach feed material, minimizing downstream processing needs, and achieving high vanadium purity of up to 99.7%, while optimizing the extraction and recovery of vanadium from titanomagnetite-type ores.
Implementation Method 1
a reduction step using a carbon reductant like coke
Implementation Method 2
a ferric leach step with ferric chloride
Implementation Method 3
subsequent acid leach step using hydrochloric acid
Data Source
Figure 1
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AI summary
A method (10) for preparing a leach feed material, the method (10) comprising the steps of: passing an ore or concentrate containing vanadium and iron to a reduction step (12) to form a reduced ore or concentrate; and passing the reduced ore or concentrate to a ferric leach step (14) to produce a ferric leachate containing iron and a ferric leach residue containing vanadium, wherein the ferric leach residue is suitable for use as the leach feed material for extracting and recovering vanadium.