Glass Manufacturing Using Controlled Quicklime Granulometry
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Solution Overview
Problem
The glass-making industry faces challenges in reducing energy consumption and minimizing CO2 emissions during glass production, with existing methods experiencing issues such as high energy requirements, refractory lining degradation, and excessive dust emissions due to the reactivity of quicklime with moisture.
Innovation Solution
A method is developed to prepare a mixture of glass raw materials with specific granulometry and moisture content, using calcium oxide with a controlled granulometry and minimal water addition, which reduces energy consumption and CO2 emissions by optimizing the melting process and minimizing carry-over and dust emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If limestone is used as a raw material, then CO2 is given off during refining, but energy consumption is high and refractory linings are degraded
Solution Approach 1:
The patent changes the chemical form of calcium from carbonate (limestone) to oxide (quicklime). This parameter change fundamentally alters the refining process: quicklime reacts with silica and other components to form glass directly without releasing CO2, while also reducing the energy required for decomposition and melting
2Productivity
If quicklime with fine granulometry is used, then melting is faster, but carry-over and dust emissions increase
Solution Approach 1:
The patent optimizes the granulometry parameter of quicklime to a specific range (0.063-2mm with predominance of 0.25-1mm particles). This optimized particle size distribution achieves optimal balance: sufficient surface area for rapid melting while limiting fine dust generation that causes carry-over and emissions
3Ease of operation
If water is added to the mixture, then manipulation becomes easier, but exothermic reaction occurs and temperature increases
Solution Approach 1:
The patent applies partial hydration by adding water in controlled amounts (0.5-5% by weight) rather than full hydration. This partial action provides sufficient moisture for mixture manipulation and transport while limiting the exothermic reaction to acceptable temperature increases that do not compromise safety or glass quality
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
The method achieves a 4-6% reduction in energy consumption, increased furnace productivity, and a significant decrease in dust emissions, while maintaining the quality of the glass produced, by controlling the granulometry and moisture content of the calcium oxide and sodium carbonate mixture.
Implementation Method 1
water and lime react together exothermically. The temperature reached makes the mixture difficult to manipulate.
Implementation Method 2
The glass bath is mainly heated by radiation.
Implementation Method 3
the calcination of CaCO3 to form CaO
Data Source
AI summary
Method for manufacturing glass, comprising preparing a mixture of glass raw materials for a glassworks furnace, wherein water, sand and sodium carbonate are mixed in mass proportions of between 0 and 5%, 40 and 65%, and more than 0 and no more than 25% respectively, and, within a time of less than 10 minutes, preferably simultaneously, calcium oxide is added in a mass proportion of between 1 and 20% of the total, the calcium oxide has a granulometry such that more than 97% by mass does not pass through a sieve of 0.125 mm, more than 96% by mass does not pass through a sieve of 0.5 mm, preferably more than 95% by mass does not pass through a sieve of 1 mm.