Method of making waterproof magnesium oxychloride refractory brick by fly ash from municipal solid waste incineration

US11279655B2 · kind B2 · utility

Assignee

• TSINGHUA UNIVERSITY · CN

Inventors

• Jinhui Li · Beijing, CN
• Yang Li · Hangzhou City, CN
• Quanyin Tan · Beijing, CN

Key dates

• Filing date: Jun 21, 2019
• Grant date: Mar 22, 2022
• Expiry date: Jun 21, 2039

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P40/60
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention discloses a method of making waterproof magnesium oxychloride refractory brick using fly ash from municipal solid waste incineration (MSWFA). The solidification and stabilization of heavy metals in MSWFA is achieved by the chemical action of a sulfur-containing compound and a physical wrapping of a geopolymer. The large amount of chloride ions in MSWFA is also reused in the manufacture of magnesium oxychloride refractory brick, which requires a high chlorine environment. This method, with the inclusion of the geopolymer, also produces refractory brick exhibiting improved water resistance relative to traditional magnesium oxychloride refractory brick, thereby allowing the improved magnesium oxychloride refractory brick to be used in a wider range of applications.