The iron ore processing flow sheet depends on the type of ROM ore feed and the optimum product. For high quality flaky ore and blue dust, termed, “direct ore”, dry screening into lumps and fines are practised, because, if wet treated, good quality material is rejected in slime. Further, dry screened fines also retain ultra fines particles required for sintering. Beneficiable ore types are subjected to wet screening – classification or scrubbing – wet screening – classification for more tenacious gauge. Iron values are recovered from classifier for dewatering of hydrocyclone underflow. Ore processing plants at Barsua, Bolani, Bailadila, Donamalai, Dalli, Gua, Kiriburu, Meghahatuburu, Noamundi and Rajhara use dry screening for direct ore. In addition, except for Rajhara and Gua all these plants use wet screening – classification for beneficiable ores. Scrubbers are additionally used at Barsua, Bolani, Dalli and Noamundi. Jigs to treat classifiers sand have been provided at Barsua. In Sesa Goa, washing in log washers produces stable and better quality lumps. The beneficiation equipments used in the major iron ore processing plants in India are given below.
Various test work have carried out in India to improve the quality of lumps and fines and recover iron values from slime. Air – pulsated Jigs have been tested and it is reported that Al2O3 has reduced to 1.5 – 2% from 3.14 – 4% for Noamundi fines at a yield of 72 – 83%. Testing of slime from Noamundi plant in multigravity separator (MGS) showed that a concentrate of 2.78% Al2O3 could be produced from a feed of 5.59 % Al2 O3 at a yield 65% No commercial model of MGS has yet been developed in India. One stage wet high intensity magnetic separation at 1.8 mm gap and field intensity of 1.2 Tesla could produce Iron Ore of 63.1% Fe, 2.56 % Al2 O3 and 1.47 % SiO2. This equipment produces good results for worse quality slime also. High gradient magnetic separators also produced good results in beneficiating iron ore slime from Bailadila 14 and Goan Ores. Gravity separation of slime by hydrocycloning and WHIMS are also carried out by prime research organisations in the country. Various techniques and methods generally being used in the Indians iron ore processing are schematically shown in the figures below.
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PRESENT IRON ORE PROCESSING TECHNOLOGY IN INDIA
PRESENT iron ore PROCESSING TECHNOLOGY IN INDIA
The iron ore processing flow sheet depends on the type of ROM ore feed and the optimum product. For high quality flaky ore and blue dust, termed, “direct ore”, dry screening into lumps and fines are practised, because, if wet treated, good quality material is rejected in slime. Further, dry screened fines also retain ultra fines particles required for sintering. Beneficiable ore types are subjected to wet screening – classification or scrubbing – wet screening – classification for more tenacious gauge. Iron values are recovered from classifier for dewatering of hydrocyclone underflow. Ore processing plants at Barsua, Bolani, Bailadila, Donamalai, Dalli, Gua, Kiriburu, Meghahatuburu, Noamundi and Rajhara use dry screening for direct ore. In addition, except for Rajhara and Gua all these plants use wet screening – classification for beneficiable ores. Scrubbers are additionally used at Barsua, Bolani, Dalli and Noamundi. Jigs to treat classifiers sand have been provided at Barsua. In Sesa Goa, washing in log washers produces stable and better quality lumps. The beneficiation equipments used in the major iron ore processing plants in India are given below.
Various test work have carried out in India to improve the quality of lumps and fines and recover iron values from slime. Air – pulsated Jigs have been tested and it is reported that Al2O3 has reduced to 1.5 – 2% from 3.14 – 4% for Noamundi fines at a yield of 72 – 83%. Testing of slime from Noamundi plant in multigravity separator (MGS) showed that a concentrate of 2.78% Al2O3 could be produced from a feed of 5.59 % Al2 O3 at a yield 65% No commercial model of MGS has yet been developed in India. One stage wet high intensity magnetic separation at 1.8 mm gap and field intensity of 1.2 Tesla could produce Iron Ore of 63.1% Fe, 2.56 % Al2 O3 and 1.47 % SiO2. This equipment produces good results for worse quality slime also. High gradient magnetic separators also produced good results in beneficiating iron ore slime from Bailadila 14 and Goan Ores. Gravity separation of slime by hydrocycloning and WHIMS are also carried out by prime research organisations in the country. Various techniques and methods generally being used in the Indians iron ore processing are schematically shown in the figures below.