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A Glass Briquette and Forming System

IP.com Disclosure Number: IPCOM000249164D
Publication Date: 2017-Feb-08

Publishing Venue

The IP.com Prior Art Database

Abstract

A glass briquette product comprises crushed/reclaimed glass and a binder material. The method of formation involves the steps of mixing reclaimed glass, comprising glass fines of a size of smaller than 10mm, with a binder material to create a mixture, and subsequently compressing the mixture in a chamber to form a briquette having the shape of the interior of the chamber. The use of a binder material and the application of pressure helps to ensure that robust briquettes are formed from the reclaimed glass fines.

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3210/3384/P/GB

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A Glass Briquette Forming System

The present invention relates to glass recycling, and in particular to the formation

of briquettes from small particles of glass.

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In an effort to drive recycling, it has become common for authorities to collect or

accept mixed recyclable materials. Rather than requiring individuals or

businesses to completely sort their waste into plastics, paper, glass etc at source,

the mixed or co-mingled recyclables are taken to a Materials Recovery Facility

(MRF) for separation and processing prior to being recycled. 10

Producing bottles and other glass products from recycled glass requires less

energy input than working from raw materials, so is clearly desirable. However,

problems can arise if contaminants such as paper labels, plastic or metal caps or

lids and ceramic stones and porcelain (CSP) are present in the crushed glass 15

product or cullet. These problems are typically more pronounced with glass

obtained from a Materials Recovery Facility (MRF glass), where contaminants can

often be present in unacceptable amounts in the crushed glass when it arrives.

Impurities in the raw glass product can cause unwelcome chemical reactions

during melting and thus make the product unsuitable for recycling. In some cases, 20

the impurities can also cause damages to the furnaces used.

Various processing and cleaning methods for separating recoverable glass from

MRF glass are known, but are generally inefficient. For example, screening the

product is ineffective where there is little difference between the particle size of the 25

glass cullet and the contaminants and/or where moisture is present causing the

contaminants to stick to the glass. Separation by weight/density can be effective

for lightweight contaminants, and ferrous metals can be removed using magnets,

but contaminants such as CSP and non-ferrous metals which may have similar

densities to glass and would not be removed. 30

These remaining contaminants, and many others, are less susceptible to breakage

than glass, so one option would be to crush the glass cullet to a smaller particle

3210/3384/P/GB

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size and then filter or screen the resulting material. This helps to ensure that there

is a difference between the particle size of the glass and that of CSP or other

contaminants prior to filtering/screening, such that the CSP or other contaminants

can be separated from the glass more easily. Small particles (<5mm) of

contaminants that remain in the cullet after this process will often melt in the heat 5

of the furnace or pass through without causing significant problems. However,

Larger (around 10-15mm) non-melt particles, of metal or CSP for example, have

the potential to block the shear blade during processing of the molten glass. In

extreme cases, this can lead to a blow back of molten glass from the furnace,

representing a significant health and safety risk to operators. As such, even if the 10

crushing operation fails to remove all of the remaini...