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.
Jan 01 2015018332Figure 15 1 shows the flow sheets for modern straight grate and grate kiln pelletizing processes The straight grate process consists of a single furnace which is divided into different zones for drying preheating and indurating green balls and zones for cooling the fired pellets.
Oct 06 2017018332Both straight grate and grate kiln furnaces have been accepted in the iron ore industry Both are considered to be roughly equal when comparing overall.
Pellets are made from iron ore that is finer than that used for sintered ore The ore fine is formed into spheroids called green balls approximately 12mm in diameter The green balls are fired into Pellet quality 1 Grate Kiln Cooler process enables all pellets to.
Outotecs traveling grate pelletizing plant is the industrys leading induration technology for iron ore pellet production for a wide range of plant capacities Based on over 60 years experience and world class RampD our process produces uniform pellets and ensures high performance and quality with low investment and operating costs as well.
Novel Drying Process Assisted by Microwave to Iron Ore Pelletizing 3 2 3 Drying experimental procedure The pot grate furnace has the objective of simulate conditions of an induration process The main constituents of the furnace are1 the combustion chamber where a burner containing LPG liquefied petrol gas oxygen and.
Grate Kiln iron ore pelletizing system Principles of operation The process air introduced for pellet cooling is circulated from the cooling zone of the grate in a multi pass manner to the other process zones to obtain thermal efficiency.
The average iron content of pellets is 63 percent 11 23 2 Process Description2 5 41 concentrating the ore by separating the particles from the waste material gangue and pelletizing the iron ore concentrate A simplified flow diagram of these processing steps is shown in Figure 11 23 1 AA Gratekiln gas fired acid pellets 3 03 023.
In the Grate Kiln process the traveling grate is used to dry and preheat the pellets Material moves on straight travelling grate till it attains the temperature of 800176C to 1000176C Thereafter it is transferred to refractory lined rotary kiln for induration where the temperature is further raised up to 1250 1300176C.
Grate Kiln process is unique process designed to evenly indurate pellets to increase its mechanical properties This process employ a conventional Straight Grate followed by a Rotary Kiln designed to churn the pellets amp thus increase even heating as well to avoid fragmentation in transportation.
5 Pellet roasting process grate rotary kiln method The grate rotary kiln was first used in cement industry and it was used in metallurgy industry in 1960s The first pellet production line was built in the world The pelletizing process is characterized by three.
Jan 01 2012018332In Grate Kiln process green pellets are fed on oil or gas fired endless Straight Grate machine where they are dried and preheated The preheated pellets are then fed to a rotary kiln where their temperature is raised in oxidizing atmosphere to 12901400 176C In induration ore grains are sintered together with oxidation and slag forming bonds.
How iron ore pelletizing has recently gained new kiln efficiencies More stable kilns improved productivity and enhanced process control are delivering more for the industry than ever before Extract from a paper presented at the Torex International Academic and Practical Conference.
Whether using the straight grate process or adding a rotary kiln to make the grate kiln process our products are key to the process To dry and heat the ore pellets a number of fans are used to recycle heat from the kiln.
Grate Kiln Iron Ore Pelletizing Plant Manufacturer In China Apr 14 2013 it utilizes the heat coming from the kiln and iron ore pelletisation plant in china rotary kiln for iron in pelletizing iron ore water and a binder are balled in a mechanical disc or drum to produce agglomerates and high temperature treatment within the furnace iron ore pellet grate kiln natural gas crusher south africa.
Ten are currently being mined Straight grate process Grate kiln process Process unit Malmberget Kiruna Svappavaara Ore bodies 20 10 1 1 Sorting plant 1 1 Concentrating plant 1 3 1 Pelletising plant 2 3 1 Description of the LKAB upgrading process chain in Malmberget.
Iron ore green balls are soft and easy to break So after the pelletizing and screening operations iron ore pellets have to be hardened in a furnace through a firing process Once fired they can be handled loaded in ships or trains and delivered to the end users the straight travelling grate and the grate rotary kiln technologies.
Drying and pre heating increase the strength of the pellets In the process large amounts of energy are generated when the magnetite oxidised to form haematite which reduces the energy requirement by 60 percent As LKAB has two different types of pelletising plant straight grate and grate kiln plants the drying process varies slightly.
Grate Kiln Process Iron Ore Pelletising The production of Iron ore pellets is a complex business measured in millions of tons of production Pellet plants are built to meet any or a combination of criteria like Captive Merchant Magnetite.
The Pelletizing Process The production of iron ore pellets from fines to finished product can differ based on a variety of factors As such its important to note that the process described here is a generalized approach subject to many variations In general three primary phases occur in iron ore pelletizing MixingPreconditioning.
Mar 21 2015018332disc pelletizer grate kiln proces Pelletization pellets rotating drum Travelling grate process Understanding Pellets and Pellet Plant Operations Pelletizing is an agglomeration process which converts very fine grained iron ore into balls of a certain diameter range normally 8mm to 20 mm also known as pellets.
Iron ore concentrate pellets are traditionally hardened at high temperatures in horizontal grates and grate kiln furnaces However heat induration requires tremendous quantities of energy to produce high quality pellets and is consequently expensive Cold bonding is a low temperature alternative to heat induration Pellets can be cold bonded.
Nov 26 2014183 For the pelletizing of iron ore there are two main types of processes namely the straight travelling grate STG process and the grate kiln GK process In the STG process a stationary bed of pellets is transported on an endless travelling grate.
The iron ore pelletizing system agglomerates iron ore fines into pellets which are then hardened in a furnace to produce iron ore pellets These pellets are usually sent to blast furnaces or direct reduction plants as part of the steelmaking process Metso is a supplier of straight grate and grate kiln pelletizing.
During the re configuration of their grate kiln induration system for the firing of iron ore pellets at the thermal flow analysis of the design options on the existing cooler in support of the process change of gas flow through the cooler coupled with the heat transport and exchange with the cooling pellet bed.