drying and preheating processes of iron ore pellets in a traveling grate

Induration drying and hardening of iron ore pellets is an energyintensive feed preparation step for both the blast furnace and direct reduction routes to iron It is commonly carried out by a ‘gratekiln’ process A mathematical model of the process is described

The grate kiln process was developed by former Allis Chalmer and the first plant on this technology was constructed in 1960 In the grate kiln process Fig 3 the traveling grate is used to dry and preheat the pellets Material moves on straight travelling grate till it attains the temperature in the range of 800 deg C to 1000 deg C

A mathematical model of drying and preheating processes in a traveling grate was presented based on the laws of mass momentum heat transfer and drying semiempirical relations Mathematical model of grate kiln cooler process used for induration of iron ore pellets

There are two main processes for producing iron ore pellets The GrateKiln 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

drying and preheating processes of iron ore pellets in a Process for producing iron ore oxidized pellets from magnetite Various iron ore pellet heating and firing processes are known including the use of grate kilns drying preheating at a temperature of

Nov 26 2014 · In the STG process a stationary bed of pellets is transported on an endless travelling grate through the drying oxidation sintering and cooling zones In the GK process drying and most of the oxidation is accomplished in a stationary pellet bed transported on a travelling grate

The following describes operations at the National Steel Pellet Company an iron ore Creating steel from lowgrade iron ore requires a long process of mining crushing to the traveling grate furnace for further drying and preheating

Iron ore pelletizing GrateKilnTM system Iron ore pelletizing 3 Process flexibility There are two main processes for producing iron ore pellets The GrateKiln 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

The iron ore pelletizing process consists of three main steps Pelletizing feed preparation and mixing the raw material iron ore concentrate additivesanthracite dolomiteand binders are prepared in terms of particle size and chemical specifications dosed and mixed together to feed the pelletizing process

Aug 04 2015 · Processes of producing iron ore pellets mainly include vertical shaft furnace moving grate and traveling grate–rotary kiln Although the investment and operating cost of shaft furnace is low this process is confronted with market shrink due to its low productivity and the requirement of magnetite

Iron ore pelletizing 3 Process flexibility There are two main processes for producing iron ore pellets The GrateKiln 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

Iron Ore Processing for the Blast Furnace Iron Ore Processing for the Blast Furnace Creating steel from lowgrade iron ore requires a long process of mining crushing separating concentrating mixing pelletizing and shipping The process of mining low grade iron ore or to the traveling grate furnace for further drying and preheating The grate is fired by natural gas

The following describes operations at the National Steel Pellet Company an iron ore Creating steel from lowgrade iron ore requires a long process of mining crushing to the traveling grate furnace for further drying and preheating

Iron ore pelletizing GrateKilnTM system Iron ore pelletizing 3 Process flexibility There are two main processes for producing iron ore pellets The GrateKiln 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

However the gratekiln system consists of three separate process units connected in series a traveling grate for drying and preheating green balls a rotary kiln for indurating preheated pellets and an annular cooler for cooling the fired pellets

GrateKiln iron ore pelletizing system Principles of operation • Traveling gratePellets 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

Process flexibility Pelletization process There are two main processes for producing iron ore pellets The GrateKiln 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

Working Process After feeding the pellets to the traveling grate the unit operations of green ball drying concentrate dehydration partial calcination and partial induration are performed on a traveling grate whereupon heat transfer occurs in zones of the grate from the cross flow of process gas hot air repeatedly passed through the pellet bed in a modified countercurrent fashion

Iron ore pelletizing systems Metso Metso is supplier of both Straight Grate and Grate Kiln pellet plants Features Metso is the only supplier in the world th

Iron Ore Pellet Kiln Burners FCT Combustion A range of highquality compact burners specifically designed for iron ore sintering and pelleting plants using traveling grate kilns Iron Ore Pellet Kiln burners can also be used in a number of other applications such as hot gas generators calciners and preheat chambers Get Price

In induration the green pellets are first distributed evenly across the traveling grate and then hardened in a furnace where they pass through updraft drying downdraft drying

The following describes operations at the National Steel Pellet Company an iron ore mining and processing facility located on the Mesabi Iron Range of Minnesota Creating steel from lowgrade iron ore requires a long process of mining crushing separating concentrating mixing pelletizing and