Biomass-Derived Polyols for Cement Grinding Efficiency
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Solution Overview
Problem
The grinding of cement clinker and limestone is energy-intensive and inefficient due to the buildup of finer materials on grinding media and mill surfaces, which existing grinding aids like polyglycerols from fossil fuel sources cannot effectively address, especially when they contain high levels of polyglycerols and salts that reduce efficiency and lead to sludging.
Innovation Solution
Employing biomass-derived polyols, specifically low molecular weight triols from biofuel production, such as crude biofuel-derived glycerin with high glycerol content and conventional grinding aids like triethanolamine, to inhibit pack setting and reduce energy consumption by enhancing the grinding efficiency of cement and limestone into finer particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional grinding aids like polyglycerols from fossil fuel sources are used, then grinding operation can proceed, but they contain high levels of polyglycerols and salts that reduce efficiency and lead to sludging
Solution Approach 1:
The invention changes the chemical composition parameters of the grinding aid by using biomass-derived polyols with specific molecular weight ranges (preferably low molecular weight triols) and controlled polyol content (0.1-10% by weight), thereby eliminating sludging while maintaining grinding efficiency
Solution Approach 2:
The invention uses crude polyols from biofuel production as a cost-effective alternative to conventional grinding aids, utilizing a readily available by-product that can be used directly without extensive purification, thus reducing costs and avoiding sludging issues
2Loss of energy
If grinding operation is performed without grinding aids, then no sludging occurs, but substantial quantities of time and energy are consumed
Solution Approach 1:
The invention modifies the chemical parameters of the grinding aid by using polyols with specific molecular characteristics and controlled concentrations, enabling effective prevention of pack setting and coating buildup while minimizing energy consumption and avoiding harmful sludging
Solution Approach 2:
The biomass-derived polyols act as an intermediary substance that prevents direct contact and adhesion between ground particles and mill surfaces, thereby reducing energy consumption without causing sludging
3Ease of manufacture
If crude glycerin from fossil fuel processing with 50% glycerol purity is used, then grinding aid function is provided, but care is needed to prevent sludging and grinding aid efficiency is reduced
Solution Approach 1:
The invention changes the purity and molecular weight parameters of the glycerin by using biomass-derived polyols with controlled composition (0.1-10% polyol content, preferably low molecular weight triols), achieving both ease of manufacture and high grinding aid efficiency without sludging
Solution Approach 2:
The invention utilizes crude polyols from biofuel production as a cost-effective, readily available material that requires minimal processing and provides superior grinding aid performance without the sludging problems associated with conventional crude glycerin
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
Biomass-derived polyols improve the grinding efficiency by reducing energy requirements and preventing pack setting, allowing for finer particle sizes with less energy consumption and minimizing the risk of sludging, making the process more economical and effective.
Implementation Method 1
The addition of a grinding aid enables the mill to grind the clinker to a smaller size with less energy by prohibiting the buildup of a coating of finer material on the grinding media and walls of the mill by coating the nascent surfaces of the cement clinker
Implementation Method 2
This tendency to pack setting is inhibited by reduction in the high surface energy of the cement produced upon grinding
Data Source
AI summary
Compositions and methods for increasing grinding efficiency of cement, cement clinker, raw materials for cement, and other inorganic particles. Use of biomass-derived polyols such as diols, triols, or mixtures thereof, optionally with a conventional grinding aid, cement quality improver, and/or hexavalent chromium reducer, are believed to provide less risk of sludging when compared to glycerides obtained from fossils fuel sources.