Abstract
The aim of this study was to investigate the properties of an organic binder used in cold-bonded briquettes (CBBs) prepared from two different iron bearing materials. The applied binder is a type of starch as indicated by chemical analysis, iodine-starch staining and Fourier transform infrared analyses. Thermogravimetric differential scanning calorimetry showed that the binder pyrolysis undergoes four stages: moisture desorption, ash volatilization, pyrolysis of organic matter and decomposition of materials with high activation energy. The difference between the dry and heat-treated samples during the macroscopic failure process is the instability propagation of the crack. The CBB shows a low decrepitation index at 700 °C. The returned fines of CBBs used with the organic binder were applied in two blast furnaces. The industrial trials showed that the CBBs do not influence the performance of the blast furnace and can reduce the fuel consumption rate. The curing rate of the binder decreases, and the growth rate of compressive strength decreases during the curing process. Iron ore particles are bonded together and exist in the form of aggregation after mixing with water and binder. The edges and corners of the particles become blurred, and the original surfaces of the particles are covered with binder film, the surface of which is covered with fine particles. The multi-branched structure of amylopectin provides omnibearing adhesion sites, thus forming binder agglomeration and film leading to a strong adhesion between binder and iron ore particles. Binder film and binder agglomeration work together to make the CBB perform well.
Highlights
Briquetting is an important process that is used to recycle and utilize the fine particles of steel plants as a product that provides suitable feed for metallurgical furnaces [1,2,3,4,5,6]
The aim of this study was to investigate the properties of an organic binder used in coldbonded briquettes (CBBs) prepared from two different iron bearing materials
A CBB avoids heating up, softening, and melting the fine particles, which can save a lot of fossil energy and manpower
Summary
Briquetting is an important process that is used to recycle and utilize the fine particles of steel plants as a product that provides suitable feed for metallurgical furnaces [1,2,3,4,5,6]. A cold-bonded briquette (CBB) is the product of the briquetting process. The charging of the CBBs in a blast furnace depends on the physical and mechanical properties of the briquettes [1,7,8]. The binder determines whether the quality of the CBB can directly charge in the furnaces. Various kinds of binders such as pitch, molasses, starch, bentonite, sodium silicate and cement, or mixtures of these, have been used as binders [1,9,10]. Used pitch as a binder for the mixture of mill scale and blast furnace flue dust. Kumar et al [7] investigated molasses, starch and sodium silicate as binders for the mixture of several types of dust and mill scale. Commercial binder usually has better performance; it is important to determine these properties in order to develop new binders
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