Enhanced desulfurizing flotation of coal using sonoelectrochemical method.

Area of Science:

• Electrochemistry
• Mineral Processing
• Environmental Science

Background:

• Low sulfur coal requires efficient desulfurization methods to meet environmental standards.
• Traditional flotation methods may not be sufficient for removing all forms of sulfur from coal.

Purpose of the Study:

• To investigate the sonoelectrochemical method for enhanced desulfurization of low sulfur coal.
• To optimize treatment conditions for maximizing sulfur reduction and clean coal yield.

Main Methods:

• Utilized a sonoelectrochemical method with sodium chloride electrolyte and anhydrous ethanol additive.
• Employed a single-factor method to study the effects of various parameters (ethanol concentration, salt concentration, voltage, temperature, time, granulometry).

Main Results:

• Achieved optimal desulfurization under specific conditions: 1.7 mol/L anhydrous ethanol, 5.1×10⁻³ mol/L sodium chloride, 10 V, 70 °C, 50 min for -0.18 mm coal.
• Reduced sulfur content by up to 69.4%, with partial removal of pyritic sulfur, organic sulfur, ash, and moisture.
• Demonstrated high sulfur reduction, high yield, and high ash reduction simultaneously.

Conclusions:

• The sonoelectrochemical method offers an effective approach for enhanced coal desulfurization.
• Ultrasound irradiation significantly improves electron transfer efficiency, leading to increased clean coal yield.
• This method provides a promising solution for cleaner coal processing and reduced environmental impact.