Hydroxamate-Fatty Acid Collector Composition for Selective Ore Flotation
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Solution Overview
Problem
Existing collectors for lithium and rare earth ores are inefficient in separating desired minerals from unwanted impurities, particularly at low temperatures, leading to increased viscosity and reduced processability, and do not achieve high concentrate recovery with good selectivity.
Innovation Solution
A collector composition comprising fatty acids, hydroxamic acids, sulfonate compounds, and optional amines, with controlled viscosity, is used in the flotation process to enhance separation efficiency and selectivity, suitable for use at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional collectors are used for lithium and rare earth ore beneficiation, then the separation process can proceed, but the concentrate recovery is low and selectivity is poor
Solution Approach 1:
The patent uses a composite collector system comprising multiple components: a primary collector (fatty acid or its salt), a secondary collector (hydroxamate or its salt), and auxiliary agents (dispersants, pH modifiers). This composite approach synergistically enhances both recovery and selectivity, where the primary collector provides bulk flotation and the secondary collector improves selective attachment to lithium and rare earth minerals while suppressing gangue minerals.
Solution Approach 2:
The patent optimizes multiple parameters including pH (maintained at 9-11 using sodium hydroxide or calcium hydroxide), reagent dosages (primary collector 50-200 g/t, secondary collector 10-50 g/t), and temperature control. These parameter changes create optimal conditions for selective mineral flotation, improving both recovery efficiency and separation selectivity simultaneously.
2Temperature
If conventional collectors are used at low temperatures, then the flotation process can continue, but viscosity increases and processability decreases
Solution Approach 1:
The patent addresses low-temperature viscosity issues by incorporating specific dispersants (sodium hexametaphosphate, sodium silicate) that maintain reagent fluidity at low temperatures. The formulation also includes ethanol or isopropanol (5-20% by weight) as co-solvents that prevent excessive viscosity increase, ensuring the collector remains pumpable and distributable even at temperatures below 10°C.
Solution Approach 2:
The patent uses water as an intermediary medium to dilute the collector composition to 5-20% concentration before application. This dilution with water, combined with the use of dispersants and co-solvents, prevents the collector from becoming too viscous at low temperatures, maintaining ease of handling and application.
3Reliability
If conventional collectors are used for lithium ore separation, then flotation can occur, but the ability to differentiate surface hydrophobicity between valuable minerals and gangue is insufficient
Solution Approach 1:
The patent employs a composite collector system where the primary collector (fatty acid or salt) provides general hydrophobization of mineral surfaces, while the secondary collector (hydroxamate or salt) selectively enhances the hydrophobicity of lithium and rare earth minerals through specific chemical interactions. This composite approach creates sufficient hydrophobicity differentiation between valuable minerals and gangue, improving both reliability and productivity of separation.
Solution Approach 2:
The patent achieves local quality enhancement by having the hydroxamate component specifically target and interact with lithium and rare earth mineral surfaces, creating localized zones of enhanced hydrophobicity on these valuable minerals while leaving gangue minerals relatively unaffected. This selective local action improves separation efficiency without requiring excessive reagent dosages.
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 composition achieves higher concentrate recovery and improved selectivity in separating lithium and rare earth minerals, with reduced viscosity and enhanced processability, even at low temperatures.
Implementation Method 1
the valuable minerals (or unwanted gangue materials in reverse flotation) are hydrophobized with the flotation collectors and then attached to the surface of the bubbles
Implementation Method 2
a few patents involved the use of hydroxamic acid or its salt, which actively chelates with specific minerals for efficient separation
Implementation Method 3
Froth flotation is a widely practiced technique in mineral beneficiation, which is a process where valuable constituents of an ore are concentrated via physical separation
Data Source
Figure 1
AI summary
Disclosed herein are collector compositions comprising fatty acids and/or fatty acid derivatives and hydroxamic acids or hydroxamates, which can be used for the beneficiation of industrial minerals.