Vanadium Recovery Flowsheet for Selective Leaching of Titanomagnetite Ore
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Solution Overview
Problem
Current methods for vanadium recovery from low-grade titanomagnetite ores are inefficient, energy-intensive, and environmentally unsustainable, with high reagent consumption and impurity dissolution, leading to low selectivity and high capital and operating costs, and there is a lack of integrated flowsheets addressing the recovery of high-purity vanadium pentoxide and marketable by-products.
Innovation Solution
A method involving medium-intensity magnetic separation, high-intensity magnetic separation, reverse silica flotation, roasting, leaching, and solvent extraction to produce a high-purity vanadium pentoxide product, with integrated nanofiltration and precipitation steps to recover vanadium and titanium-iron by-products, optimizing the process for minimal impurity dissolution and sustainable resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional salt-roast leach technologies are used to process VTM concentrates, then vanadium can be extracted, but titanium and iron units become waste products with little economic value and high reagent consumption occurs
Solution Approach 1:
The patent applies discarding and recovering by separating vanadium from the roast product through selective leaching, while the remaining titanium-iron slag is not discarded as waste but recovered and processed further to produce marketable titanium dioxide and iron oxide by-products, thereby converting waste into valuable materials
Solution Approach 2:
The patent applies segmentation by dividing the roast product into distinct phases: a leachable phase containing vanadium that is processed through selective leaching, and a non-leachable titanium-iron slag phase that is further processed through flotation and roasting to separate titanium and iron components for individual product recovery
2Manufacturing precision
If magnetic separation is used to upgrade VTM ores and reject silica, then silica content is reduced, but weakly magnetic vanadium bearing minerals such as hematite and goethite are not recovered
Solution Approach 1:
The patent applies intermediary by introducing a magnetic roasting step as an intermediate process between conventional magnetic separation and leaching. This magnetic roasting transforms weakly magnetic vanadium minerals into strongly magnetic phases, enabling their subsequent recovery through magnetic separation while maintaining effective silica rejection
Solution Approach 2:
The patent applies parameter changes by altering the magnetic properties of vanadium-bearing minerals through controlled roasting treatment. The roasting process changes the mineralogical and magnetic characteristics of the ore, converting weakly magnetic phases into strongly magnetic phases that can be effectively separated
3Quantity of substance
If direct acid or alkaline leaching is used on VTM ores, then vanadium can be solubilized, but excessive iron and gangue mineral dissolution occurs resulting in low selectivity
Solution Approach 1:
The patent applies preliminary action by performing selective roasting of the VTM concentrate before leaching. This pre-treatment step modifies the mineralogy and chemical composition of the ore, creating conditions that enable selective leaching of vanadium while minimizing the dissolution of iron and gangue minerals in subsequent acid or alkaline leaching steps
Solution Approach 2:
The patent applies parameter changes by altering the chemical and mineralogical parameters of the ore through controlled roasting. The roasting process changes oxidation states, creates soluble vanadium compounds, and modifies the reactivity of associated minerals, thereby enabling selective vanadium extraction in subsequent leaching
4Manufacturing precision
If multiple beneficiation and processing steps are implemented to achieve high-purity vanadium recovery, then product purity increases, but process complexity and capital costs increase
Solution Approach 1:
The patent applies merging by combining multiple separation and purification functions into integrated process units. The magnetic roasting-flotation-leaching sequence is designed as an integrated flowsheet where each step builds on the previous one, and by-products are recovered simultaneously with the main vanadium product, reducing overall process complexity
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
The method achieves high-purity vanadium pentoxide recovery (>99.5%) with reduced impurity dissolution, efficient resource utilization, and environmentally sustainable disposal of by-products, enhancing economic sustainability and reducing operational costs.
Implementation Method 1
magnetic separation is used to upgrade VTM ores and reject silica
Implementation Method 2
reverse silica flotation processes
Implementation Method 3
Roasting the vanadium-containing concentrate
Implementation Method 4
Leaching a product of the roasting step (ii) to extract vanadium into a pregnant leach liquor
Implementation Method 5
Passing the pregnant leach liquor of leaching step (iii) to a precipitation step
Implementation Method 6
Treating a precipitate from step (iv) to obtain a vanadium product
Data Source
AI summary
A method for the recovery of vanadium, the method including the steps of:(i) subjecting a vanadium-containing ore to a beneficiation step incorporating a sequence of medium-intensity magnetic separation, high-intensity magnetic separation and reverse silica flotation processes to form a vanadium-containing concentrate;(ii) roasting the vanadium-containing concentrate;(iii) leaching a product of the roasting step (ii) to extract vanadium into a pregnant leach liquor;(iv) passing the pregnant leach liquor of leaching step (iii) to a precipitation step; and(v) Treating a precipitate from step (iv) to obtain a vanadium product,wherein an iron-titanium product from step (iii) is recovered.