Elaboration of an advanced ceramic made of recycled industrial steel waste

A method of forming a ceramic from steel slag for use as a thermal energy storage material, comprising:

• milling steel slag to form powder;
• removing free iron from said powder with a magnet;
• heat treating said powder at a temperature in the range of 700° C. to 1200° C. for a time period in the range of 1 hour to 10 hours and oxidizing retained iron in said powder;
• compacting said powder at a compression pressure in the range of 20 MPa to 300 MPa;
• and
• sintering said powder for four hours at a temperature in the range of 700° C. to 1400° C. to provide a ceramic.

A method of forming a ceramic from steel slag for use as a thermal energy storage material, comprising:

• milling steel slag to form powder;
• removing free iron from said powder with a magnet;
• heat treating said powder at a temperature in the range of 700° C. to 1200° C. for a time period in the range of 1 hour to 10 hours and oxidizing retained iron in said powder;
• mixing additives into said powder;
• compacting said powder at a compression pressure in the range of 20 MPa to 300 MPa;
• and
• sintering said powder at a temperature in the range of 700° C. to 1400° C. to provide a ceramic.