| 摘要 |
PROBLEM TO BE SOLVED: To obtain low-cost porous spinel clinker having high heat insulating property because of many pores and excellent in corrosion resistance because of many closed pores while effectively utilizing aluminum ash. SOLUTION: Aluminum ash as principal starting material or a mixture of the ash with aluminum hydroxide and/or alumina, magnesium hydroxide and/or magnesia or both of them is fired optionally after pulverization to produce the objective porous spinel clinker made of a fired body having >=3.0% closed porosity and >=10% apparent porosity. This spinel clinker is a fireproof material having high heat insulating property, excellent in corrosion resistance and very useful as stock for producing refractories such as a furnace material and brick. |
