Biodegradable ether amines for reverse cationic flotation separation of ultrafine quartz from magnetite

Area of Science:

• Mineral Processing and Extractive Metallurgy
• Surface Chemistry
• Environmental Science

Background:

• Ultrafine magnetite loss in tailings is a significant issue due to decreased magnetic separation efficiency.
• Cationic reverse flotation presents a viable alternative for recovering valuable ultrafine iron ore particles.
• Developing eco-friendly reagents is crucial for sustainable mining operations.

Purpose of the Study:

• To evaluate the flotation performance of two biodegradable ether amines (diamine and monoamine).
• To investigate the interaction mechanisms between these collectors, ultrafine quartz, and magnetite.
• To determine the potential for separating quartz from magnetite using these novel reagents.

Main Methods:

• Single and mixed mineral flotation tests were performed on ultrafine particles (<20 µm).
• Surface chemistry techniques including zeta potential, contact angle, and surface tension measurements were employed.
• Spectroscopic analysis (Fourier transform infrared) and turbidity measurements were utilized to understand adsorption and aggregation phenomena.

Main Results:

• Both ether diamine and monoamine demonstrated high flotation efficiencies for ultrafine quartz (95.9% and 97.7%, respectively).
• Effective separation of quartz from magnetite was achieved, indicating the selectivity of the collectors.
• Turbidity data suggested collector-induced magnetite aggregation, promoting its depression in flotation.

Conclusions:

• Biodegradable ether amines are efficient and selective collectors for ultrafine quartz flotation.
• The interaction mechanisms involve preferential adsorption on quartz and aggregation of magnetite particles.
• These findings support the application of ether amines in sustainable ultrafine magnetite recovery processes.