The schematic diagram of the straight grate induration process is shown in Fig. ... 65%, moisture content 8.5%, and bentonite addition 0.9% for roasting of the pellets to optimize the firing cycle in the straight grate induration machine. Prior to subjecting green pellets to high temperature, they must be dried at a lower temperature to prevent ...
Traveling grate pelletizing Outotec Traveling Grate Pelletizing is the industry's leading induration technology for iron ore pellet processing and is designed for a wide range of plant capacities up to 9.25 million t/a. Based on over 60 years' experience and world-class R&D, our process produces
The pot grate is a pilot facility where the green pellets are fired according to a defined heating and cooling cycle (i.e., drying rate, heating rate, and cooling rate) which simulate the actual ...
A mathematical model of pellet induration process in the straight-grate system is presented. The important physical and chemical phenomena known to affect the heat and mass transfer in the process have been taken into account in the formulation of the model. ... sphericity, porosity, composition, and moisture content), induration …
Dynamic simulation of pellet induration process in straight-grate system - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Paper on modeling of iron ore pelletizing furnace for induration
Straight grate furnaces are widely used for induration of hematite pellets where typically 1%–2% carbon is added to the green mix to help in generating heat by combustion.
TRAVELING GRATE DIMENSIONS: 189–816 m² reaction area; 3.0 or 4.0 m machine width; CAPACITY: 1.2–9.25 million t/a, in single unit; Specific production rates between 15 t per day and m² for limonite and 40 t for magnetite
The induration process in travelling grate typically consists of four distinct phases: drying, preheating, firing, and cooling. The first stage of drying is updraft to …
During induration in a straight grate machine, the green pellets pass through four different thermal treatments, namely drying, preheating, heating and cooling. The pellet bed is fired with ...
The process essentially involves production of green pellets and induration on a traveling grate furnace to promote inner partial melt and agglomeration that confers adequate physical and metallurgical properties. ... Dynamic simulation of pellet induration in straight-grate system. Int J Miner Process, 89 (2008), pp. 30-39. View PDF View ...
as complete grate-kiln-cooler machines. Straight grate $ WSLFDO VWUDLJKW JUDWH IXUQDFH FRQVLVWV RI D VHULHV RI ]RQHV ... Figure 1 — Block diagram of the drying, heating, and cooling zones in an iron-oxide pellet straight grate induration fur-nace. Pellets are fed at the right side. Cooling air enters at the left. UDD = updraft drying, DDD ...
Investigation of factors affecting pellet strength in straight grate induration machine T. Umadevi*, P. Prachethan Kumar, Prasanna Kumar, Naveen F. Lobo and Madhu Ranjan During induration in a straight grate machine, the green pellets pass through four different thermal treatments, namely drying, preheating, heating and cooling.
The Straight grate induration machine is a continuous flow of pallet cars that move through drying, preheating, indurating, and cooling without intermediate transfers. The …
A three-dimensional CFD model of a straight grate furnace for indurating iron-oxide pellets was developed for exploring conditions of furnace operation for fluid flow, heat transfer and...
Download scientific diagram | -Block diagram of the drying, heating, and cooling zones in an iron-oxide pellet straight grate induration furnace. Pellets are fed at the right side. Cooling air ...
During induration in a straight grate machine, the green pellets pass through four different thermal treatments, namely drying, preheating, heating and cooling. The pellet bed is fired with downdraught firing leading to thermal gradients through the bed. Corex sludge, which is used as fuel in the pellet mix, supplies the necessary energy for ...
The building footprint of the induration furnace is significantly smaller compared with the straight grate process, which means that the world's most compact pelletizing plant – with its low building profile, short process air ducts, and standardized equipment - allows the cost of iron production to be slashed. Revamp of pelletizing plants
The most widely used industrial processes for pellet induration are the straight grate and the grate-kiln. The straight grate process is composed of a single furnace where an endless line of ...
Straight grate induration machine is basically a cross current, gas-solid reactor. Straight grate loaded with green pellets moves in X direction or horizontal direction and gases moves across the bed in vertical or Z direction. Induration furnace is divided into seven zones. Up-Draft drying, down-draft drying, preheating, firing, after firing ...
Straight grate furnaces are widely used for induration of hematite pellets where typically 1%–2% carbon is added to the green mix to help in generating heat by combustion.
Process flexibility Pelletization process There are two main processes for producing iron ore pellets: The Grate-Kiln system and the straight grate system. In the straight grate system, a continuous parade of grate cars moves at the same speed though the drying, induration and cooling zones. Any change in one section effects the residence time ...
Mathematical models of straight-grate pellet induration processes have been developed and carefully validated by a number of workers over the past two decades. However, the subsequent exploitation of these models in process optimization is less clear, but obviously requires a sound understanding of how the key factors control the operation. In this …
ing grate where they are dried and fired to increase their strength. They form a packed-bed that is subsequently air-cooled to recycle the heat and to obtain an appropriate temperature for further handling. Two types of systems are usually used for induration of the iron-ore pellets: (a) straight-grate and (b) grate-kiln process. A
The grate-kiln induration machine - History, advantages, and drawbacks, and outline for the future February 2015 Journal of the Southern African Institute of Mining and Metallurgy 115(2):137-144
DOI: 10.1016/0301-7516(79)90031-0 Corpus ID: 98573752; Development and validation of a mathematical model for the moving grate induration of iron ore pellets @article{Thurlby1979DevelopmentAV, title={Development and validation of a mathematical model for the moving grate induration of iron ore pellets}, author={J. A. Thurlby and …
This article focuses on straight grate induration machines. In a straight-grate machine, a hearth layer of hardened pellets is loaded onto an endless chain of pallet cars to form …
During induration in a straight grate machine, the green pellets pass through four different thermal treatments, namely drying, preheating, heating and cooling. The pellet bed is fired with downdraught firing leading to thermal gradients through the bed. Corex sludge, which is used as fuel in the pellet mix, supplies the necessary energy for …
A mathematical model of pellet induration process in the straight-grate system is presented. The important physical and chemical phenomena known to affect the heat …
During induration in a straight grate machine, the green pellets pass through four different thermal treatments, namely drying, preheating, heating and …
Energy consumption by the induration machine is, thus, ... The highly integrated nature of the pellets and the gas flow throughout the straight grate induration system means that small changes in the process conditions are reflected throughout the whole operation [4]. The main usefulness of the developed model over a range of the …