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AKTET ISSN 2073-2244Journal of Institute Alb-Shkencawww.alb-shkenca.orgRevistë Shkencore e Institutit Alb-ShkencaCopyright © Institute Alb-ShkencaPROCESSING OF NICKEL OXIDE ORES IN THE ROTARY KILN WITHOUT LIMESTONE IN“FERRONIKELI I RI” IN DRENASTRAJTIMI I XEHEVE OKSIDE TË NIKELIT NË FURRËN RROTULLUESE PA GUR GËLQERORNË “FERRONIKELIN E RI” TË DRENASITSHEFIK IMERI 1 , NAIM TAHIRAJ 1 , MUSA RIZAJ 21 Ferronikeli i ri Drenas, Kosovë2 Fakulteti i Xehetarisë dhe Metalurgjisë, Universiteti i Prishtinës, KOSOVEEmail: shefik.imeri@kosovo-nickel.comAKTET IV, 2: 261-265, 2011PERMBLEDHJEProcesi i përfitimit të ferronikelit karakterizohet më vështirësi të mëdha tekniko-teknologjike dhe ekonomike. Nëvazhdën e përmirësimit të procesit metalurgjik të shkrirjes elektrike të sharzhës për përfitimin e ferronikelit ështëarritur që të eliminohet nga procesi në tërësi shtimi i sasisë së gurit gëlqeror në sharzhën e furrës rrotulluese.Efektet pozitive që janë arritur në procesin e fërgimit në furrë rrotulluese janë: zvogëlimi i konsumit të mazutit,zvogëlimi i ngjitjeve të fërgesës në zonën e fërgimit, rritja e temperaturës së materialit të fërguar, rritja e koeficientittë shfrytëzimit të Ni, rritja e shkallës së para-reduksionit të materialit të fërguar dhe rritja e kapacitetit të furrësrrotulluese. Krahas përmirësimit të procesit metalurgjik të prodhimit të Fe-Ni, është arritur edhe zvogëlimi i shkallëssë ndotjes së mjedisit, duke ulur sasinë e prodhuar të CO 2 në furra rrotulluese dhe furra elektrike.Fjalët kyçe: disocim, para-reduktim, fërgesa, Fe-Ni i pa-përpunuar.SUMMARYProcess of obtaining Fe-Ni is characterized with lot of technical-technological and economical difficulty. In order toimprove metallurgical process of obtaining Fe-Ni, was achieved, to be eliminated at all the adding of quantity ofLimstone in charge of rotary kiln. Positive effects, which have been achieved in calcinations process of rotary kilnare: reducing of mazut consumption, reducing of sticking material in calcinations area, increasing of temperature ofcalcine, increasing of recovery of Ni, increasing of pre-reduction of calcine and increasing of rotary kiln capacity.Except improvement to the metallurgical process of obtaining Fe-Ni, has been decreased the pollution ofenvironment as well, producing less CO 2 in rotary kilns and electro-reduction furnaces.Key words: Crude Fe-Ni, dissociation, pre-reduction, calcine1. INTRODUCTIONThe aim of this investigation was to improve themetallurgical process of obtaining Fe-Ni and toincrease the quantity and quality of producedcalcine in rotary kiln, in order to increaseproduction capacity of obtaining Fe-Ni. It wasachieved eliminating at all the adding of Limstonein charge of rotary kiln.2. TREATMENT OF NICKEL OXIDE ORES INROTARY KILNIn industrial way was approved that nickel oxideores can be treated without problem in rotarykiln with out Limstone (sterile material). Since5.02.2010 the rotary kilns are operating with outadding of Limstone in the charge. Under way, wecan give an example of operations of rotary kilnnr. 2.
Imeri et al.Date on 14.07.2010. Rotary kiln nr 2 wasoperating as follow:Average capacity 102t/hrLignite 10.5 %Ore composition (%): Gllavica ore: 51.7%Cikatova ore: 17.25 %Albanian ore – Aren: 6.9%Albanian ore –Yzo: 3.45 %Indonesian ore: 20.7 %ε = 100 %Charge composition (t): Gllavica ore:Cikatova ore: 17.59 tAlbanian ore – Aren: 7.038 tAlbanian ore – Yzo: 3.519 tIndonesian ore: 21.115 tLignite10.71 tQuantity of charge: ε = 112.71 t52.73 tChemical composition of ore, calcine,temperature of calcine and gases are given intable: 1, 2 and 3.Ni % Fe % Co % Cr 2 O 3%CaO % MgO%Al 2 O 3%SiO 2 % Fe 2 O 3%H.P % Humidity%1.11 19.9 0,03 1,06 2.55 10.80 3.2 43.83 28.48 23.47Table 1. Average Chemical composition of ore.Ni % Fe tot.%Co % Cr 2 O 3 % CaO% MgO% Al 2 O 3 % SiO 2 % C fix % Fe met. % FeO%Fe 2 O 3%1,26 17,6 0,04 1,43 2.71 15.65 2,8 46.65 3.32 0.16 9.24 14.87Table 2. Average Chemical composition of calcineTemp.ofcalcine.OPM8°CM7°CM6°CM5°CM4°CM3°CM2°C715 613 826 483 376 250 197 870 704 666 433 287 229670 644 706 322 314 227 186 827 638 576 486 264 246720 604 758 350 423 263 176 876 703 661 538 261 250OP – Optical Pyrometer.Table 3. Temperature of material and gases inside Rotary KilnM1°CG7°CG6°CG5°CG4°CG3°CG2°CG1°CG0°CFor capacity of rotary kiln of 102t/hr, in thecharge was added 7.038 t Albanian ore Aren and3.519 t Albanian ore Yzo.Additional quantity of Fe total from Albanian oreAren:7.038 t /hr X 23.19 % Fe total = 1.63 t Fe tota /hr.Additional quantity of Fe total from Albanian oreYzo:3.519 t /hr X 38.37 % Fe total = 1.35 t Fe tota /hr.Total additional quantity of Fe total = 1.35 tFe tota /hr + 1.63 t Fe tota /hr = 2.98 t Fe tota /hr .The quantity of reducing of CaCO 3 due to addingAlbanian ores is 10% of the overall charge, orRotary Kiln capacity of 102 t / hr: 102 t/hr X 10 %CaCO 3 = 10.2 t CaCO 3 /hr, or considering themoisture of CaCO 3 from 0.85%, then:10.2 t CaCO 3 /hr X 0,9915 = 10.11t CaCO 3 /hr.The practical results proved that ≈ 60% of CaCO 3dissociated in rotary kiln under reaction:CaCO 3 CaO + CO 210110 kgCaCO 3 /hr x 60% = 6066 kgCaCO 3 x44/100 = 2669.04 kgCO 2 /hr,Or 2669.04 kg CO 2 /hr x 22,4/44 = 1358.78m 3 NCO 2 /hr.262AKTET Vol. IV, Nr 2, 2011
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AKTETJournal of Institute Alb-Shken
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