grate kiln process

  • Pelletising | Iron and Steel | Howden

    In contrast to pulverized-fuel-fired boilers, a grate-kiln process is characterized by a longer residence time, a highly oxidizing atmosphere, the presence of recirculating alkalis and disintegrated iron-ore pellet dust in the process gas. Given the foregoing, ash deposition phenomena in the grate-kiln process are much more complex compared to ...

  • CFD MODELLING OF THE FLOW THROUGH A GRATE-KILN

    The most important differences include that a grate-kiln has three distinct pieces of equipment, a preheat grate, a rotary kiln and an annular cooler, whereas in the case of a straight grate, the entire indurating process is done on one piece of equipment only.

  • Introduction to Iron ore Pellets and Pelletizing processes ...

    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 800°C to 1000°C. Thereafter it is transferred to refractory lined rotary kiln for induration where the temperature is further raised up-to 1250 – 1300°C.

  • Comparison of pelletizing technologies with specific ...

    2c) Process Principles: Grate/Kiln "Modern Design" 2nd Iranian Iron and Steel Conference 26-28/09/2016 14 1) Five-stage Preheat Grate with one internal and three cooler recycles

  • APPLICATION OF COMPUTATIONAL FLUID DYNAMICS …

    In the traveling-grate process, pellets are charged at one end and dried, preheated, fired, and cooled as they are carried through successive sections of the equipment before exiting at the other end. Traveling grates and grate-kilns have similar capacities, and up to …

  • Cement kiln - Wikipedia

    Grate kiln process. 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 ...

  • Pelletizing Process

    Dec 28, 2015· Another constructor of grate-kiln plants is Kobe Steel, who built their first plant in 1966 at Kobe Works, Nadahama, and have since then constructed more than ten plants, most of which are still in use. Since 2000, the grate-kiln process developed by the Shougang Group has been rapidly adopted in …

  • Pelletizing Grate Kiln | Pelletizing Grate Kiln Manufacturer

    grate- or grate-kiln processes. In the grate-kiln process in focus in this paper, wet green pellets are loaded on a grate that takes the pellets through several zones for drying, pre-heating and oxidation from magnetite to hematite. Next, the pellets are fed into a rotary kiln where sintering takes

  • Iron processing - Ores | Britannica

    The process to harden pellets by heating them up to the sintering temperature is called induration. There are three induration processes: Grate-Kiln, Straight Grate, and Vertical Shaft furnace, of which the first two are dominating whereas the shaft furnace is retreating. Figure 1.1.11 illustrates a typical pellet firing process …

  • Iron Ore Agglomeration Processes and their Historical ...

    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. After indurating in the kiln, cooling fans are used to cool the pellets for handling downstream, and fans are used to ...

  • Mechanisms of Deposit formation in the Grate-kiln Process ...

    Grate-Kiln-Cooler process allows independent operation adjustment of grate, kiln and cooler, which enables the operators ; a) to, easily and without any risk, decrease and increase the rate of pellet production. b) to overcome radical changes in the characteristics of iron ore materials fed to the

  • 11.23 Taconite Ore Processing

    Dec 28, 2015· Another constructor of grate-kiln plants is Kobe Steel, who built their first plant in 1966 at Kobe Works, Nadahama, and have since then constructed more than ten plants, most of which are still in use. Since 2000, the grate-kiln process developed by the Shougang Group has been rapidly adopted in …

  • Iron Ore Agglomeration Processes and their Historical ...

    in the grate-kiln process for iron ore production; specifically, how waste heat con- tained in flue gas could be recirculated in order to achieve a decrease in specific fuel consumption.

  • Modelling of heat recovery in LKAB's grate-kiln process

    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.

  • Grate-Kiln System for iron ore pelletizing - ...

    11.23.2 Process Description2-5,41 ... W Grate/kiln furnace feed 3-03-023-49 X Straight grate furnace feed 3-03-023-79 Y Vertical shaft furnace feed 3-03-023-69 Z Hearth layer feed to furnace 3-03-023-48 AA Grate/kiln, gas-fired, acid pellets 3-03-023-51 AB Grate/kiln, gas-fired, flux pellets 3-03-023-52 ...

  • Test work proves up processing pathway for Australian ...

    Description of Grate-Kiln Process LKAB has three pelletizing plants based on the Grate-Kiln process and a fourth plant, KK4, is under construction. The process consists of three parts; grate furnace with moving grate band, rotary kiln and an annular cooler, see flowsheet in Figure 1. Wet green pellet balls are fed on the moving grate to form

  • Grate Kiln System

    The combustion process takes place in the combustion chamber, which is bounded below by the grate, on the sides and the ceiling by the cooled heating surfaces (membranes) of the boiler. In the upper part of the combustion chamber secondary air is injected for swirling and homogenization of the flue gas flow in order to achieve a good combustion ...

  • Mechanisms of Deposit formation in the Grate-kiln Process ...

    Process Design Improvements. The GRATE-KILN System has changed significantly in design concept since the first systems were commissioned for Cleveland Cliffs Iron Company in the early 1960's through the most recent startup of the LKAB KP-79 plant in Kiruna, Sweden in 1981.

  • The cement kiln

    2c) Process Principles: Grate/Kiln "Modern Design" 2nd Iranian Iron and Steel Conference 26-28/09/2016 14 1) Five-stage Preheat Grate with one internal and three cooler recycles

  • Iron Ore Pelletizing Grate-Kiln System Brochure - ...

    Jul 10, 2017· In the grate-kiln process, shown in Figure 8, there are three different reactors. The drying, pre-heating, and cooling steps are similar to that of the straight grate process. The general concept of heat recovery by using hot gases from downstream in the process for drying and for feeding the burners is also present. However, a rotary kiln is ...

  • Pelletisation / Production - Baldota

    In the grate kiln process, a chain grate system is used for drying & pre-heating the green balls to be fed into the rotary kiln, where they are indurated. The pellets are finally cooled in a circular cooler. Iron ore pellets are being increasingly favoured in modern blast furnaces. The proportion of pellets in iron making is increasing due to ...

  • CONTRIBUTIONS TO THE TECHNOLOGY COMPARISON BETWEEN ...

    Comparative study of pellets fired in pot grate and grate kiln pilot furnaces Minerals & Metallurgical Processing, 2017, Vol. 34, No. 2, pp. 84-90 ... Currently, the great majority of pellet producers use the traveling grate process because of its higher production capacity. In this study, the physical and chemical qualities of the pellet feed ...

  • Rotary kilns -

    In contrast to pulverized-fuel-fired boilers, a grate-kiln process is characterized by a longer residence time, a highly oxidizing atmosphere, the presence of recirculating alkalis and disintegrated iron-ore pellet dust in the process gas. Given the foregoing, ash deposition phenomena in the grate-kiln process are much more complex compared to ...

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