Fine Comminution of Pine Bark: How Does Mechanical Loading Influence Particles Properties and Milling Efficiency?

Area of Science:

• Biomass processing and comminution technologies.
• Sustainable chemistry and materials science.
• Particle engineering and powder technology.

Background:

• Lignocellulosic biomass is a sustainable alternative to fossil feedstocks.
• Dry comminution is an energy-intensive step in biomass utilization.
• Milling efficiency depends on biomass properties and process parameters.

Purpose of the Study:

• To compare the fine milling performance of maritime pine bark in impact and attrition mill configurations.
• To analyze the impact of milling configuration on powder properties and energy consumption.
• To understand the role of agglomeration in biomass milling.

Main Methods:

• Fine milling of maritime pine bark using impact and attrition mills.
• Characterization of resulting powders: particle size distribution, shape, specific surface area, and agglomeration.
• Analysis of energy consumption in relation to process parameters and powder properties.

Main Results:

• Agglomeration significantly influences milling efficiency and limits ultrafine particle generation.
• Impact milling effectively breaks down coarse particles but leads to high agglomeration.
• Attrition milling results in lower agglomeration and produces finer biomass particles.

Conclusions:

• Attrition milling is superior to impact milling for achieving finer lignocellulosic biomass particles.
• Controlling agglomeration is crucial for optimizing biomass comminution processes.
• Understanding milling mechanisms is essential for efficient biomass feedstock preparation.