Cullet Separation and Grinding

Using cullet in the melt is a common activity and helps reduce energy consumption. Cullet, however, needs to be cleaned from contaminants and color separated. A technology that is developed in the US, called GlasMax uses grinding to clean cullet. In this technology, color sorted cullet is autogenously ground, where size reduction is limited only to cullet. This process produces a 99% clean cullet. 

Size of cullet particles can also be a factor determining cullet usability for certain products, such as blown glass. By having a proper grinding system cullet that would otherwise had to be discarded can be used in production; thereby saving not only energy but also reducing waste disposal and raw material costs (Worrell et al., 2008. p.56).

Development Status Products
Commercial

Cullet Separation and GrindingCosts & Benefits

Parent Process: Batch Preparation
Energy Savings Potential

Increased availability of suitable cullet helps reduce energy consumption. 

In one plant, recycling rate for internally produced cullet has been increased from 30% to 75% with the installation of a cullet crusher (Worrell et al., 2008. p.56). 

CO2 Emission Reduction Potential
Costs

Installation of a crusher enabled increasing the recycling rate of internally produced cullet from 30% to 75%, resulting in US $190 000 [1997 dollars] cost savings due to reduced waste handling and material purchases. Payback time was 3 weeks (Worrell et al., 2008. p.56). 

Cullet Separation and Grinding Publications

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56