Pelletization process Because the induration of the pellets occur in the rotary kiln, the pellets produced in a Grate-KilnTM system are consistently of higher quality than those produced in a straight grate. The rotary kiln provides constant mixing of the pellets, bringing all the pellets to the same temperature.
Aug 04, 2015 Fig. 1 shows the iron ore pellet production at home and abroad together with domestic pig iron production in the past 10 years. Processes of producing iron ore pellets mainly include vertical shaft furnace, moving grate and traveling graterotary kiln.
Kiln The kiln is a refractory lined cylinder rotating about its axis. The kiln slopes slightly downward from feed to discharge end. The slope and rotation of the kiln move the material through it. Kiln speed is variable to vary pellet retention time.
Jun 15, 2018 The required roasting temperature in the rotary kiln to obtain qualified roasted pellets is about 1280 C in this grate-kiln plant and it is closer to the temperature near the walls at the refractory linings. It should be mentioned that the wall temperature and gas temperature is difficult to be measured during the iron ore pellet production.
rotary kiln process using calibrated ore and non coking coal. However, Rotary kiln process suffers from serious limitations like low productivity and pollution. In this respect fixed bed Tunnel kiln furnace are evolving as an alternative to Rotary kiln process. Iron ore fines and the low grade beneficiated iron ore cake are directly used for manufacturing of sponge iron in tunnel kilns.
The main raw materials for the production of DRI by the rotary kiln process are i sized graded iron ore or iron ore pellets, ii non-coking coal, and iii dolomite in small quantities to scavenge the sulphur. Iron ore of the right quality is the basic input for the coal based direct reduction process.
Grate-Kiln iron ore pelletizing system Principles of operation Traveling grate-Pellets are dried and partially indurated through multiple cross flow process zones updraft drying, downdraft drying, tempered preheat, and preheat, strengthening pellets for processing in rotary kiln
nitrogen 13,14. When coal is combusted in iron-ore rotary kilns, the NOx formation is dominated by the conversion of char-N to NO 15,16. At present, NOx emission reduction is mainly accomplished through reducing the injection of coal gas or pulverized coal, reducing rotary kiln temperature,
Rotary kiln is a pyroprocessing device used to raise materials to a high temperature calcination in a continuous process. Materials produced using rotary kilns includeCement, Lime, Refractories,Metakaolin, Titanium dioxide, Alumina, Vermiculite, Iron ore pellets.
The rotary kiln process chosen for the unit considers reduction of iron ore 5-20 mm with solid carbonaceous material like coal heated up to a temperature of 950-10000c in rotary kiln and then. www.spongeitc.com 10. cooled in a rotary cooler with external water cooling system.
The NOx reduction in the iron ore pelletizing process becomes an important environmental concern owing to its role in the formation of photochemical smog and acid rain. Thus, it is essential to develop new technologies for reducing NOx emissions in order to contribute to the cleaner production of pellets. In this paper, NOx reduction by advanced reburning ingrate-rotary kiln for oxidized ...
in an inclined horizontal rotary kiln, which rotates at a programmed speed. A temperature profile ranging from 7000C-10500C should be maintained along the length of the kiln at different zones. As the material flows down due to rotary action and gravity, the ore is reduced. The kiln is divided into two zones the pre-heating zone and
CFD analysis of an induration cooler on an iron ore grate-kiln pelletising process
Apr 23, 2014 The KOBELCO Pelletizing System is a grate-kiln process where iron ore pellets undergo heat treatment in two stages. Iron ore and binding agents are ground and formed into green balls, the unfired pellets. The green balls are sent to a traveling grate where they are dried and preheated in the preheating furnace.
A Mechanical Engineer with over 32 years of field experience in Iron ore beneficiation and Pelletizing Plants. He has worked in project, operation and maintenance of Pellet plant in both straight grate and grate kiln design. He started his career from Ms Kudremukh Iron Ore Company Pellet Plant, as Maintenance Engineer.
The serious deposits on the refractory bricks are found in the grate kiln in iron ore pellet plants, which significantly influence the pellet production. The effect of the combustion reaction of pulverized coal on the deposit formation in kiln during iron ore pellet production was investigated in this work. Hematite iron ore was used as raw material to be pelletized, and the pulverized coal ...
include iron scrap, reduced iron pellets and reduced iron briquettes. Sintered ore is made by partially melting and sintering coarse iron ore 1 to 3mm in size into products having a size of 15 to 30mm. The sintering process uses the combustion heat of coke breeze fuel. Pellets are made from iron ore
rotary kiln iron ore pellet process Solution for Mining Quarry. three dimensional flow chart of iron pellet plant grate kiln tech Grate-Kiln Process Iron Ore Pelletising Jul 10, 2007 Allis Chalmers subsequently developed More detailed
These pellets are then used for making sponge iron. Rotary kilns have a drawback upon the size and quality of iron ore that can be used. Initially, when the process was first introduced, the ore with an iron content 65 was preferred and the preferred size of ore was 5-18mm.
Sponge iron process uses a rotary kiln for the reduction of high grade lump ores or pellets Fig. 1. The feed is introduced together with reducing and de-sulphurizing agents lime- stone or raw dolomite into an inclined rotary kiln, heated counter current to the flow of hot gas and reduced to form sponge iron.
process. One application of such a process is the thermal treatment of iron ore pellets. The work has been performed in close collaboration with the iron ore producing company LKAB. The model is applied to assess the process in terms of heat and mass flows. The
Pelletizing, or balling, carried out through either a disc pelletizer or rotary drum, is a key part of efficiently and sustainably producing steel from iron ore fines of varying sources. FEECO is a leader in feasibility testing, custom disc pelletizers and balling drums, and parts and service support for the iron ore ballingpelletizing industry.
rotary kiln, and hot air from the cooler is utilised in the rotary kiln The pellet bed on the grate is only 150 -200 mm deep, and no protective layer is required on the grate since it is subjected to low temperatures. The firing in rotary kiln lasts longer and the material is cooled bycooling air
Thermogravimetric analysis TGA has been used to research the pyrolysis and combustion processes of coal used in rotary kiln of iron ore oxide pellet. Furthermore, the effects of air flow and oxygen concentration on the combustion behavior of coal were examined with TGA. The results showed that two individual stages can be distinguished for the pyrolysis of coal, the water evaporation stage and the de
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