Patent Profile
| Patent No: | IN215626 [India] | Application No: | 87/DEL/2002 |
| Title: | A process for the production of magnesite-chrome aggregates useful as refractory material | ||
| Issue Date: | 28-02-2008 | File Date: | 31-01-2002 |
| Inventor(s): | Arup Ghosh; Barundeb Mukherjee; Manas Kamal Haldar; Himanshu Shekhar Tripathi; Jnan Ranjan Biswas; Samir Kumar Das | ||
| IPC Classification: | C04B 35/047 | ||
| Abstract: | Magnesitechrome refratories are combination of magnesia and chrome ore with Cr2O3 content varying in a wide range. These refractories possess good high temp properties and moderately volume stability at elevated temperature. The major application areas of these refractories are in the steel, cement and copper industry. Mag-chrome refractories, till recently was being produced from magnesia and massive chrome ore. However, as this variety of ores is depleted, the alternate friable chrome ore has become the other option. The present invention relates to a process for the production of magnesite-chrome aggregates from friable chrome ore with Cr2O3 content in the range of 5 to 30%. The process consists of mixing of sintered magnesia and friable chrome ore, milling, incorporation of additives and sintering in the range of 1550 deg.C to 1750 deg. C. The selected additives either form liquid phase or changes the phase assemblage and reduces dihedral angle. The advantage of this process is development of low porosity magnesite-chrome aggregates from a relatively cheaper raw material by single firing. The direct bonding and exsolution of chrome spinel in the magnesia grains are observed in the microstructure of aggregates. |
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: director[at]cgcri[dot]res[dot]in
:91-33- 24735829
:https://www.cgcri.res.in