- Mon - Sat 8:00 - 18:00
- [email protected]
- 0086-21-58386256
The deposit-forming problem is one of the main bottlenecks restricting the yield and production benefit of iron ore pellets produced by coal-fired rotary kilns. In order to implement measures to ensure the efficient production of pellets by coal-fired rotary kilns, the mechanism and influencing factors on the deposit formation were reviewed. …
Successfully developed an innovative process of direct reduction of cold-bound pellets from iron ore concentrate with a coal-based rotary kiln, in comparison with the traditional direct reduction of fired oxide pellets in coal-based rotary kilns, possesses such advantages as: shorter flowsheet, lower capital investment, greater economic profit, …
conditions in an industrial case of iron ore pelletizing, applying a coal flame. 2. METHODOLOGY AND MODELING 2.1. Grate-Kiln Process. Figure 1 illustrates the grate-kiln heat treatment process for the magnetite-rich iron ore studied. The iron ore is, mined, refined,and formed into so-called green pellets before entering the heat treatment …
The dominant process adopted to produce iron ore pellets in China is the grate-kiln process [10–12]. The preheated pellets roll in the rotary kiln and can be sintered uniformly; therefore, it is known that the grate-kiln method yields a superior and more consistent pellet quality compared with the straight-grate process [13].
The pelletizing process was selected for this study due to its popularity in ironmaking business and the ability to produce uniform-sized pellets at high capacity and low cost. …
Processes 2020, 8, 1470 2 of 12 the emission targets, NOx emission has become a restriction factor in the development and production of pelletizing plants because of its high removal cost and complex process [8–10]. Pellet production in China is mainly produced by a grate-rotary kiln process, and its output accounts for nearly 60% of the
Wang Y, Fan X, Chen X. Mathematical models and expert system for grate-kiln process of iron ore oxide pellet production (Part I): mathematical models of grate process. J Central South Univ Technol (Engl Ed) 2012; 19: 1092–1097.
The production process of direct reduced iron from titanomagnetite by coal reduction in air in rotary kiln is a key step in the extraction of titanium and iron. This process is conducive to alleviating the stocking problem of a large amount of Ti-bearing blast furnace slag. The relationships between particle movement and pulverized coal …
Iron ore was reduced in a pilot scale rotary kiln (ϕ1.5 m × 15 m), as shown in Fig. 2.Iron ore pellets (5 ∼ 12 mm) with fractional coal (3 ∼ 8 mm) were fed from the kiln end, the rest coal was injected by gunjet from kiln head, with total mass ratio of pellet/coal = …
-Pelletizing Process can produce superior and various quality pellets because of application of rotary kiln where pellets are heated and fired unifomly, know-how of plant operation & quality control, and advanced process control system.. And the process can use various iron ores such as magnetite ore, hematite ore, dry or wet material. ...
This paper summarizes more than a decade of systematic studies of the flow field in an iron ore pelletizing rotary kiln using computational fluid dynamics (CFD) on simplified models of a real kiln. …
rotary kiln. Therefore, as an alternative liquid iron production technology to the BF process, further research into the PROM process is of great significance. As a typical type of complex iron ore with the coexistence of titanium and vanadium, vanadium-titanium magnetite (VTM) is widely distributed in China, the Americas, Russia, and South ...
ScienceDirect JOURNAL OF IRON AND STEEL RESEARCH, INTERNATIONAL. 2013, ZO(4): 16-19 Temperature Field Simulation Model for Rotary Kiln of Iron Ore Oxidized Pellet FAN Xiao-hui, LI Jun, CHEN Xu-ling, WANG Yi, GAN Min (School of Minerals Processing and Bioengineering, Central South University, …
Download scientific diagram | Magnetization roasting process of iron ores in the rotary kiln. from publication: Recent Advances in Magnetization Roasting of Refractory Iron Ores: A Technological ...
The Deposit Formation Mechanism in Coal-Fired Rotary Kiln for Iron Ore Pellet Production: A Review. August 2021; ... In the cooling process of rotary kiln, the volume contraction of the silicate ...
The formed deposits wear out of refractory wall linings in the rotary kiln and may cause production disturbances. This study describes the chemical composition and mineralogical phase components at the deposit/refractory interface in the rotary kiln for fluxed iron ore pellets production. The main phases of refractory bricks are corundum …
The kinetics of non-isothermal reduction of low-grade iron ore/coal mini-pellet reduced at a low-temperature rotary kiln was investigated. Meanwhile, a 3-D computational fluid dynamics (CFD)-based simulation for heat transfer between flue gas and pellet in rotary kiln has been performed in this paper, which reveals the …
These plants use iron ore pellets in the rotary kiln. Raw material mix consisting of iron ore, dolomite and non-coking coal is fed at the one end of the rotary kiln and is heated by coal burners to produce DRI. ... 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 ...
An innovative coal-based direct reduction process of low-grade iron ore -coal composite mini-pellets in low-temperature rotary kiln has been developed by Central South University. In this approach, 3–8 mm pellets were made of mixture of sodium additives, iron ore and coal.
The three common processes used in iron ore pellet production are the shaft furnace process, the straight grate process, and the grate-kiln process. 8 As the dominant process for iron ore pellet production in China, the proportion of iron ore pellets produced by the grate-kiln process has exceeded 70%. 9 Deposit formation in a rotary …
The deposit phenomenon is frequently observed and could prevent the smooth running of the production of fluxed iron ore pellets via the coal-fired grate-kiln process in China.
Rotary kilns are involved in many aspects of solids processing, whether in drying, incineration, mixing, heating, cooling, humidification, calcination, reducing, sintering and …
The grate-rotary kiln process is widely used to produce iron ore pellets in China. Pulverized coal is commonly applied as fuel to heat and roast green pellets [[10], [11], [12]]. However, the formed deposits on the wall of the grate and kiln probably cause many serious problems [[13], [14], [15]].
Deposit formation in the coal-fired rotary kiln is frequently found in the production of fluxed iron ore pellets by the grate-kiln process and affects normal production.
Induration (drying and hardening) of iron ore pellets is an energy-intensive feed preparation step for both the blast furnace and direct reduction routes to iron. It is commonly carded out by a 'grate/kiln' process. A mathematical model of the process is described, in which mechanistic models of the grate
The dominant process adopted to produce iron ore pellets in China is the grate-kiln process [[10], [11], [12]]. The preheated pellets roll in the rotary kiln and can be sintered uniformly; therefore, it is known that the grate-kiln method yields a superior and more consistent pellet quality compared with the straight-grate process [13].
As greater amounts of fine iron ore concentrates enter the marketplace, new investments in iron ore pelletizing capacity are inevitable to deliver these concentrates to steel industry consumers.
Rotary kiln process for iron ore oxide pellet production is hard to detect and control. Construction of one-dimensional model of temperature field in rotary kiln was described. And the results lay a solid foundation for online control. Establishment of kiln process control expert system was presented, with maximum temperature of pellet and …
The Grate-Kiln process, applied in the iron ore industry, is an example of an industrial process that is attracting increased attention regarding emissions reductions. The Grate-Kiln process applies combustion of a fuel together with large volumes of pre-heated (>1000°C) air in a rotary kiln, so as to provide heat for the iron ore.
A dynamic model for an iron ore pellet kiln utilized for predictions has been derived in Fan et al. (2015), but for rotary cement kilns no such model is available.