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Separating Cassiterite from Quartz with New Collector 3-(Dodecylthio) Propionic Acid
Aoxiang Fei1,2, Ruiqi Xie1,2, Xun Wang3
1Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|August 20, 2025
Summary
A new chemical collector, 3-(dodecylthio) propionic acid (3-DTP), effectively separates tin ore (cassiterite) from quartz. This collector demonstrates high selectivity and robust performance across various conditions, improving tin recovery in mineral processing.
Area of Science:
- Mineral Processing
- Surface Chemistry
- Materials Science
Background:
- Cassiterite flotation is crucial for tin extraction.
- Existing collectors lack optimal selectivity and collectability.
- Improving cassiterite separation from quartz is an ongoing challenge.
Purpose of the Study:
- To develop and evaluate a novel collector, 3-(dodecylthio) propionic acid (3-DTP), for enhanced cassiterite and quartz separation.
- To elucidate the adsorption mechanism of 3-DTP on cassiterite and quartz surfaces.
- To optimize flotation conditions for efficient tin recovery.
Main Methods:
- Flotation experiments using artificial mixed minerals.
- Contact-angle measurements.
- Zeta potential analysis.
- Fourier-transform infrared (FT-IR) spectroscopy.
- X-ray photoelectron spectroscopy (XPS).
- Time-of-flight secondary ion mass spectrometry (ToF-SIMS) analysis.
Main Results:
- 3-DTP achieved high selectivity in separating cassiterite from quartz across a wide pH range.
- Optimal conditions (40 mg/L 3-DTP, pH 6) yielded 97.38% SnO2 grade and 87.61% recovery.
- 3-DTP formed stable chemical bonds with cassiterite via its S and O sites, creating a hydrophobic surface.
- Weak hydrogen bonding of 3-DTP to quartz resulted in low surface hydrophobicity and poor recovery.
Conclusions:
- 3-DTP exhibits superior performance as a collector for cassiterite flotation compared to conventional collectors.
- The distinct adsorption mechanisms of 3-DTP on cassiterite and quartz enable selective separation.
- This study provides a new avenue for efficient tin ore processing.
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