2024 - Sustainable Industrial Processing Summit
SIPS 2024 Volume 5. Leite Intl. Symp / Iron and Steel
| Editors: | F. Kongoli, P. Assis, R. Alvarenga Vilela, J.A. de Castro, B. Deo, W. Ferreira Santos Jr., GS. Mahobia, T. Usui |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2024 |
| Pages: | 328 pages |
| ISBN: | 978-1-998384-12-9 (CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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SINGLE STROKE DRI PELLITIZATION TECHNOLOIES
Inimella Venkata Subba Rao1;1SINGLE STROKE DRI PELLITIZATION TECHNOLOGY, Bangalore, India;
Type of Paper: Regular
Id Paper: 151
Topic: 2
Abstract:
India is one of the 3rd largest steel producers in the world, Iron Ore Beneficiation & Pelletization plants along with DRI plants which will remain the backbone of Iron & Steel Industry in the world. Existing DRI plants were commissioned by employing processing techniques suitable for good quality Iron ore lumps / fines.
Present scenario some of them are utilizing various types of process equipment and technologies i.e., rotary kiln, T.G. KILN, S.G. kiln, VSK, and Roller KILN Gate process methods. Through our innovative technology we don’t want to embrace machineries. The entire process can be carried out with the help of chemicals and, hence, sponge iron and steel industries can avoid huge investments in machinery. The chemical and physical properties of the green pellets are the same as that of the conventional method as they undergo the same conventional treatment. By graduating to this simple process, sponge iron and steel manufacturers can reduce capex by an impressive 35-40%. In the conventional method, green pellets are fired in the rotary kiln for which, over and above coal needed for injection, coal lumps, dolomite and limestone are fed. The author said, “Our innovation requires only injecting coal firing. Also, there is no need for separation after receiving the material from the kiln. We encourage the use of powder waste from mines so that production and fuel costs can be curtailed. Specific coal consumption comes down by 10% and as there is no accretion and no fused lump formation, the refractory repairing cost can be reduced by 50%. Also, maintenance, power and production costs can be reduced.”
Raghuvamsi Technologies is using only fines to produce 10 to 20 mm pellets in the rotary kiln. the green pellets keep calcined continuously at a desired rate. Once the mix is fed into the drum, heating by an external burner located near the ignition hood starts and suction of each pellet moving from feed to the discharging end is ensured. It is important that the amount of water used should not be either too little or too much. Insufficient moisture should not generate capillary that is required for bonding. Once nucleation starts, pellets start growing at an exponential rate. The ratio of water to chemical (whether powder or liquid) used is 10:1 and maintaining this ratio is crucial. For 1,000 liters of water, the amount of chemical to be used should not exceed 10.0 liters. These green pellets are then dried in normal temperature or kiln waste heat at 100-150 degree Celsius to produce pellets with acceptable strength.