Binder for H2 -based Pellets
For every 1% decrease in bentonite, the iron grade of iron ore pellets can be increased by 0.6%, the blast furnace coke ratio can be reduced by 1.2%, and the output can be increased by 1.8%.
The transformation from traditional iron- and steelmaking technologies to green H2 -based new technologies will require an improvement in the quality and purity of iron ore burden materials.
Iron ore pellets are essential inputs for producing direct reduced iron (DRI), but the conventional binders, used in iron ore pelletizing, introduce gangue oxides to the DRI and consequently increase the slag generation and energy consumption in the steelmaking unit. Partial and/or full replacement of the traditional binders with novel organic binders would significantly contribute to improving the process effificiency, particularly in the next-generation H2 -based direct reduction technology.?
The most common and traditional binder is bentonite; the wetting agent is usually water. Bentonite consists of alumina and silica and is generally added at a concentration between 0.5 and 1.5% of the iron ore concentrate . This increases the gangue materials of iron ore and consequently decreases the iron content. The addition of 1% bentonite decreases the iron content by about 7 kg/ton of iron ore .
We have developed kinds of organic binders, which can half replace the bentonite,or modify bentonite and rise the quality and purity of iron ore pellets.
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