Molasses was used as an alternative binder to the bentonite binder. The change in moisture absorption by pellets prepared with different iron ores and different molasses contents were investigated. Iron ore properties...Molasses was used as an alternative binder to the bentonite binder. The change in moisture absorption by pellets prepared with different iron ores and different molasses contents were investigated. Iron ore properties exerted the major effect on pellet behavior and final pellet quality. The absorbed moisture content of pellets prepared without binder, bentonite-added pellets, and molasses-added pellets were in the range of 7.72%–9.95%, 9.62%–10.84%, and 6.14%-6.69%, respectively. The wet pellet compressive strength of molasses-added pellets(43–230 N/pellet) was superior to that of bentonite-added pellets(9.47–11.92 N/pellet). The compressive strength of dried molasses-modified pellets increased to 222–394 N/pellet, which is currently the highest value achieved for dried pellets.展开更多
Using synthesized carboxy methyl amylopectin as organic binders for pelletizing, the dry pellet compressive strength goes up to 322.8 N per ball, dropping strength is 6.67 times per 0.5 m, and the green pellet shock t...Using synthesized carboxy methyl amylopectin as organic binders for pelletizing, the dry pellet compressive strength goes up to 322.8 N per ball, dropping strength is 6.67 times per 0.5 m, and the green pellet shock temperature reaches up to 820 ℃. The influence of the carboxy methyl amylopectin on the contact angle of iron ore surface was investigated. Compared with that having no organic binder, the surface tension increases 48 times and the capillary attraction increases 43 times. These results were obtained by using the quasi particulate model calculation. The analysis demonstrated that the behavior of polar group and organic chain structure are the reasons of improving the strength of pellet. XPS analysis indicated that polar group bonded on iron ore surface make the electron energy of 2p orbit of Fe decreases from 711 eV to 710.2 eV. The results showed that the special spatial reticular structure of organic chain can improve pellet strength and green ball shock temperature.[展开更多
The vanadium-titanium magnetite concentrate from Panxi region of China was pretreated by high pressure roller grinding（ HPRG） and then used in pelletization. Size distribution change of the vanadiumtitanium magnetit...The vanadium-titanium magnetite concentrate from Panxi region of China was pretreated by high pressure roller grinding（ HPRG） and then used in pelletization. Size distribution change of the vanadiumtitanium magnetite concentrate after HPRG and the improvement of its green pellet strength were investigated. The results indicated that,besides the increase of fine particles,the vanadium-titanium magnetite concentrate after HPRG had a smaller size ratio of fine particle to coarse particle of 0. 126,meaning a lower porosity,compared with the size ratio of raw material of 0. 157. The concentrate particles were more closely packed when there was a smaller size ratio of fine particle to coarse particle. The particle packing in the green pellets was closer after HPRG,which strengthened the green pellets with an average drop number of 5. 1（ drop height of 0. 5 m） and average compressive strength of 13. 1 N per pellet of 11 mm in diameter.展开更多
文摘Molasses was used as an alternative binder to the bentonite binder. The change in moisture absorption by pellets prepared with different iron ores and different molasses contents were investigated. Iron ore properties exerted the major effect on pellet behavior and final pellet quality. The absorbed moisture content of pellets prepared without binder, bentonite-added pellets, and molasses-added pellets were in the range of 7.72%–9.95%, 9.62%–10.84%, and 6.14%-6.69%, respectively. The wet pellet compressive strength of molasses-added pellets(43–230 N/pellet) was superior to that of bentonite-added pellets(9.47–11.92 N/pellet). The compressive strength of dried molasses-modified pellets increased to 222–394 N/pellet, which is currently the highest value achieved for dried pellets.
文摘Using synthesized carboxy methyl amylopectin as organic binders for pelletizing, the dry pellet compressive strength goes up to 322.8 N per ball, dropping strength is 6.67 times per 0.5 m, and the green pellet shock temperature reaches up to 820 ℃. The influence of the carboxy methyl amylopectin on the contact angle of iron ore surface was investigated. Compared with that having no organic binder, the surface tension increases 48 times and the capillary attraction increases 43 times. These results were obtained by using the quasi particulate model calculation. The analysis demonstrated that the behavior of polar group and organic chain structure are the reasons of improving the strength of pellet. XPS analysis indicated that polar group bonded on iron ore surface make the electron energy of 2p orbit of Fe decreases from 711 eV to 710.2 eV. The results showed that the special spatial reticular structure of organic chain can improve pellet strength and green ball shock temperature.[
文摘The vanadium-titanium magnetite concentrate from Panxi region of China was pretreated by high pressure roller grinding（ HPRG） and then used in pelletization. Size distribution change of the vanadiumtitanium magnetite concentrate after HPRG and the improvement of its green pellet strength were investigated. The results indicated that,besides the increase of fine particles,the vanadium-titanium magnetite concentrate after HPRG had a smaller size ratio of fine particle to coarse particle of 0. 126,meaning a lower porosity,compared with the size ratio of raw material of 0. 157. The concentrate particles were more closely packed when there was a smaller size ratio of fine particle to coarse particle. The particle packing in the green pellets was closer after HPRG,which strengthened the green pellets with an average drop number of 5. 1（ drop height of 0. 5 m） and average compressive strength of 13. 1 N per pellet of 11 mm in diameter.
