Methods of recycling cullet and fibreglass

A method of forming glass, the method comprising:

• introducing cullet, or fibreglass, or cullet and fibreglass, into a glass melt contained within a submerged combustion melter, the submerged combustion melter comprising one or more submerged burners,
• discharging combustion products from the one or more submerged burners directly into the glass melt, the one or more submerged burners combusting a combustible gas mixture that comprises fuel and oxygen, and,
• discharging glass from the submerged combustion melter.