Cationic Collector Reverse Flotation for Low-Silica Iron Concentrates
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Solution Overview
Problem
Existing methods struggle to achieve high recovery of iron mineral content while maintaining low silica content in the concentrate, especially in ores with higher SiO2 content, leading to economic inefficiencies and quality issues for direct reduction processes.
Innovation Solution
A reverse flotation method using 3-amino-2-hydroxypropylamine derivatives as a collector, specifically compounds of formula I, is applied to an aqueous pulp of iron ore containing iron mineral and silicate, adjusting pH and adding flotation auxiliaries to enhance selectivity and recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional flotation methods using hydrophobic amines are used to remove silica, then silica removal is achieved, but iron mineral recovery is reduced
Solution Approach 1:
The patent inverts the conventional flotation approach by making iron mineral particles hydrophobic instead of silica particles. This is achieved by using cationic collectors that selectively adsorb onto negatively charged iron mineral surfaces at controlled pH levels (8-12), causing iron minerals to float while silica remains in the tailings. This inversion resolves the contradiction by achieving both high silica removal and high iron recovery simultaneously.
Solution Approach 2:
The patent employs parameter changes by controlling pH levels (maintaining pH 8-12) and adjusting collector dosage to optimize the hydrophobization of iron minerals. By carefully controlling these parameters, the process achieves selective flotation of iron minerals with high recovery rates while effectively removing silica impurities.
2Adaptability or versatility
If higher SiO2 content ores are processed, then ore grade flexibility is improved, but concentrate quality deteriorates
Solution Approach 1:
The patent uses parameter changes by adjusting pH levels and collector concentrations to adapt to varying ore grades and SiO2 contents. This allows the process to maintain high concentrate quality (low SiO2 content) even when processing ores with higher silica content, thereby achieving both ore grade flexibility and concentrate quality.
Solution Approach 2:
The patent incorporates feedback mechanisms by monitoring and adjusting process parameters such as pH and collector dosage based on ore characteristics. This enables real-time optimization to maintain consistent concentrate quality regardless of variations in input ore grade or silica content.
3Device complexity
If conventional collectors are used, then flotation process simplicity is maintained, but economic efficiency deteriorates
Solution Approach 1:
The patent achieves economic efficiency by optimizing parameter combinations (pH 8-12, specific collector dosages) that maximize iron recovery and concentrate quality. These parameter optimizations lead to better product value and reduced processing costs, improving overall economic efficiency while maintaining process simplicity through straightforward pH control and collector addition.
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 a concentrate enriched in iron mineral content with low SiO2 levels, reducing iron mineral losses and improving economic benefits by optimizing recovery and selectivity, suitable for direct reduction processes.
Implementation Method 1
Negatively charged silicate particles can be hydrophobized using suitable amines
Implementation Method 2
Injection of air in a flotation cell leads to formation of hydrophobic gas bubbles, which can transport the hydrophobized silicate particles to the top of the flotation cell
Data Source
AI summary
The invention relates to a method for manufacturing a concentrate enriched in iron mineral content from an ore, which contains an iron mineral and silicate, by reverse flotation, which method comprises the step of(c) adding a compound of formula Iwherein R1 is C9-C22 alkyl or alkenyl, which is linear or branched, R2 is H, C1-C4 alkyl, which is linear or branched, R3 is —X—NH2, H or C1-C4 alkyl, which is linear or branched, and X is C2-C4 alkylene, which is linear or branched, or a salt of a protonated compound of formula I and an anion, to a prepared aqueous pulp of the ore and optionally one or more flotation auxiliaries to obtain an aqueous mixture. Furthermore, a method for manufacturing a specific group of compounds of formula I, i.e. compounds of formula I-Xwherein R1 is C9-C15 alkyl, which is linear or branched, R2 is H, R3 is —X—NH2 and X is C2-C4 alkylene, which is linear or branched, is disclosed.