Grate-kiln pelletization of Indian hematite fines and its industrial practice

Abstract

Indian hematite fines normally have a high iron grade and minor impurities; they are usually used as sinter fines for feeding into a blast furnace. In this work, the grindability properties of two kinds of Indian hematite fines and the roasting behaviors and induration characteristics of pellets made from these fines were revealed through experiments involving dry ball milling and small-scale and pilot-scale tests. In addition, the microstructures of the particles of ground India hematite fines and fired pellets were investigated using optical microscopy. On the basis of the results, a grate-kiln production line with an annual output of 1.2 Mt of oxidized pellets was established in India. This pellet plant operates stably and reliably, further confirming that preparing high-quality pellets with Indian hematite fines pretreated by dry ball milling is an industrially feasible process.

Keywords

hematite / pelletizing / industrial practice

References

[1] Singh G.P., Choudhary R.P., Vardhan H., Aruna M., Akolkar A.B. Iron ore pelletization technology and its environmental impact assessment in eastern region of India: a case study. Procedia Earth Planet. Sci., 2015, 11(6): 582.

[2] Dawrapudi S., Ghosh T.K., Shankar A., Tathavadkar V., Bhattacharjee D., Venugopal R. Effect of pyroxenite flux on the quality and microstructure of hematite pellets. Int. J. Miner. Process., 2010, 96(1–4): 45.

[3] Singh S., Sahoo H., Rath S.S., Sahu A.K., Das B. Recovery of iron minerals from Indian iron ore slimes using colloidal magnetic coating. Powder Technol., 2015, 269, 38.

[4] Kalra G.D. Iron ore pellets as a solution to steel-making raw materials at the crossroad and dominant constituent of basket of iron ores available for export in the future. Miner. Econ., 2014, 26(3): 127.

[5] Zhu D.Q., Chun T.J., Zhang J.L. Influence of basicity and MgO content on metallurgical performances of Brazilian specularite pellets. Int. J. Miner. Process., 2013, 125(3): 51.

[6] Pradip P. Processing of alumina-rich indian iron ore slimes. Trans. Indian Inst. Met., 2006, 59(5): 551.

[7] Dey S., Mohanta M.K., Goswami M.C., Pani S. Recovery of iron values from waste manganiferous iron ore fines for pellet making. J. Miner. Mater. Charact. Eng., 2014, 2, 513.

[8] Magdalinovic N., Trumic M., Trumic G., Magdalinovic S., Trumic M. Determination of the Bond work index on samples of non-standard size. Int. J. Miner. Process., 2012, 114-117(6): 48.

[9] Gent M., Menendez M., Toraño J., Torno S. A correlation between Vickers hardness indentation values and the Bond work index for the grinding of brittle minerals. Powder Technol., 2012, 224(5): 217.

[10] Ahmadi R., Shahsavari S. Procedure for determination of ball Bond work index in the commercial operations. Miner. Eng., 2009, 22(1): 104.

[11] B. Csoke, J. Faitli, G. Mucsi, G. Antal, and F. Bartók, Comminution of forest biomass by modified beater wheel mill in a power plant, Int. J. Miner. Process., 112-113(2012, No. 10, 13.

[12] Ipek H., Ucbas Y., Hosten C. The bond work index of mixtures of ceramic raw materials. Miner. Eng., 2005, 18(9): 981.

[13] Prieto Martinez N., Herrera Trejo M., Morales Estrella R., De Castro Román M.J., Mata Esparza R., Carreón Villareal M. Induration process of pellets prepared from mixed magnetite-35% hematite concentrates. ISIJ Int., 2014, 54(3): 605.

[14] Iron Ore Pellets — Determination of Crushing Strength, International Standard ISO4700:1996(E), ISO, Geneva, Switzerland, 1996.

[15] Iron Ore Pellets — Determination of Metallurgical Performances, International Standard ISO7215:1996(E), ISO, Geneva, Switzerland, 1996.

[16] Guo Z.Q., Zhu D.Q., Pan J., Wu T.J., Zhang F. Improving beneficiation of copper and iron from copper slag by modifying the molten copper slag. Metals, 2016, 6(4): 86.

[17] Zhu D.Q., Guo Z.Q., Pan J., Zhang F. Synchronous upgrading iron and phosphorus removal from high phosphorus Oolitic hematite ore by high temperature flash reduction. Metals, 2016, 6(6): 123.

[18] Mohamed O.A., Shalabi M.E.H., El-Hussiny N.A., Khedr M.H., Mostafa F. The role of normal and activated bentonite on the pelletization of barite iron ore concentrate and the quality of pellets. Powder Technol., 2003, 130(1–3): 277.

[19] Fu J.Y., Jiang T., Zhu D.Q. Sintering and Pelletizing, 1996, Changsha, Central South University Press 21.

[20] Zhang Y.M. Theory and Technology of Pellet, 1997, Beijing, Metallurgical Industry Press 167.

[21] GB/T 8074?2008 Testing Method of Specific Surface of Cement: Blaine Method.

[22] Wang D.J., Wu S.L. Estimation of oxidized pellets of a Brazilian hematite concentrate by adding serpentine. ISIJ Int., 2014, 54(4): 715.

[23] Yang C.C., Zhu D.Q., Pan J., Zhou B.Z., Hu X. Oxidation and induration characteristics of pellets made from Western Australian ultrafine magnetite concentrates and its utilization strategy. J. Iron Steel Res. Int., 2016, 23(9): 924.

[24] Forsmo S.P.E., Forsmo S.E., Samskog P.O., Bjorkman B.M.T. Mechanisms in oxidation and sintering of magnetite iron ore green pellets. Powder Technol., 2008, 183(2): 247.

[25] Zhu D.Q., Pan J., Emrich M., Mende V. Use of vale hematite pellet feed in Chinese pelletizing plants. Annals — 3rd International Meeting on Ironmaking and 2nd International Symposium on Iron Ore, 2008 472.