Method for preparing porous glass ceramics by waste glass through low-temperature melting and high temperature foaming

The invention relates to a method for preparing porous glass ceramics by waste glass through low-temperature melting and high-temperature foaming, and belongs to the field of energy-saving building materials. The method comprises technological steps as follows: (1), an appropriate quantity of a cosolvent, a crystallizing nucleating agent and a foaming nucleating agent are added to the waste glass subjected to crushing and fine grinding, the mixture is subjected to ball milling and uniform mixing, and mixed powder is obtained; (2), the mixed powder is uniformly spread in a refractory material mold and is directly put in a fast heating furnace, the temperature of the heating furnace is increased to 700-800 DEG C, and the mixed powder is molten at the constant temperature; (3), the molten mixed powder is subjected to constant-temperature foaming when the temperature is increased to 850-1,000 DEG C. According to two processes of low-temperature melting and high-temperature foaming by the waste glass, light-weight and high-strength porous glass ceramics mainly comprising closed pores are prepared quickly, and environment-friendly, energy-saving and large-scale waste glass recycling with high added value is realized.