CFD-DEM investigation on the agglomeration behavior of …

The occurrence of agglomeration due to particle sintering is one of the most significant technical issues hindering the direct reduction process of iron oxide fines (DRI) in a high-temperature fluidized bed. To get a better understanding of the agglomeration mechanism, the (de-)fluidization behavior of micron-sized iron oxide …

Efficient Utilization of Carbon-Bearing Dusts in Composite

This study focused on improving recycling of carbon-bearing dusts from integrated steel plants by the composite agglomeration process (CAP), in which four types of the dusts were prepared as pelletized feed, while the other raw materials were used as matrix feed for sintering to produce agglomeration product as a substitute for traditional …

The agglomeration, coalescence and sliding of …

The conventional sin-tering of a porous green body consisting of coarse polycrystalline particles is a process of grain-growth-induced densification facilitated by atomic difusion …

Iron Ore Agglomeration Technologies | IntechOpen

Sintering is a thermal process (1300–1400°C) by which a mixture of iron ore, return fines, recycled products of the iron and steel …

Langevin dynamics simulation and collision …

Agglomerate. Sintering. Langevin dynamics. Population balance model. 1. Introduction. The gas-phase methods for preparing nanoparticles using a wide variety of …

What is sintering in relation to catalyst deactivation and …

Sintering Sintering is broadly termed as a physical and/or thermal phenomenon that leads to agglomeration, a reduction in the surface to volume ratio of catalyst. It normally results in the loss of active sites due to alteration of the catalyst's structure. Depending on the catalyst's type, it can either result in loss of active sites due ...

Sintering mechanism of CaO during carbonation reaction in …

The main stages of CaO particle agglomeration were determined first, and then the diffusion factors were calculated and the effects of temperature and water vapor on the sintering process were discussed. Finally, the sintering mechanism with the participation of water vapor in the carbonation reaction was proposed. 2. Computational …

The sintering temperature of ash, agglomeration, and defluidisation in

Sintering temperatures for these samples are presented in Fig. 2. In addition, the sintering temperature of laboratory ashes for the same coal samples were obtained and compared with those generated in the PFBC. The range of measured sintering temperatures was 780–1000 °C. For samples that did not show any agglomeration, the …

Sintering | SpringerLink

Sintering is a process that consists in the thermal agglomeration of a mixture of fines that comprise iron ore, recycled iron and steelmaking products, …

What is Agglomeration? Glossary of Powder Mixing …

Pressure agglomeration is usually a dry process. Moisture or binders are not or hardly required. Common products made by pressure agglomeration include effervescent or medicinal tablets, charcoal briquettes and litter. Sintering Sintering, also known as fritting, is a thermal agglomeration process in which atoms diffuse within ...

Agglomeration behaviour of steel plants solid waste and …

At the end of sintering experiment, the produced sinter was screened over a sieve of 10 ... The studies concluded that the agglomeration properties of the flue dust and sludge fines are more appropriate in combined form in comparison to individual of flue dust and sludge. The pellets having good strength were found in the case of mixed pellets ...

Factors in fluencing particle agglomeration during solid …

and Δt=0.5s, the same results can be achieved as those presented in the following sections. Factors influencing particle agglomeration during solid-state sintering 713. 2.2 Interacting force between adjacent particles According to Refs. [24,28,31,32], the normal forceN. sand the tangential forceT.

Langevin dynamics simulation and collision frequency

Coagulation of nanoparticles from the free-molecular to the transition regime under a high-temperature environment is investigated by coupling Langevin Dynamics (LD) model with agglomeration and finite-rate sintering. The effect of temperature on the evolution of particle size and structure is investigated, variations in agglomeration …

Technology Development for Chromium Ore Agglomeration …

The specific productivity of the sintering machine and the yield of high-quality agglomeration product were also improved. Bentonite is widely used in India as a binder in the production of chromium pellets and agglomerates. The addition of bentonite to the charge in the amount of 1.5% was reported [ 8 ].

The agglomeration, coalescence and sliding of …

Conventional sintering is a time- and energy-consuming process used for the densification of consolidated particles facilitated by atomic diffusion at high temperatures. Nanoparticles, with their increased surface free energy, can promote sintering; however, size reduction also promotes agglomeratio …

Agglomeration of Powder

Abstract. Agglomeration of powders in pan granulators is a widespread production process, in many industries, e.g., agricultural and pharmaceutical. A continuous operation provides certain desired advantages over batch operation including constant throughput with constant properties of the product particles. An extended setup including a sieve ...

Langevin dynamics simulation and collision frequency …

@article{Chen2023LangevinDS, title={Langevin dynamics simulation and collision frequency modification in population balance model of nanoparticle coagulation during simultaneous agglomeration and sintering}, author={Bingqi Chen and Daoyin Liu and Zhao Chen and Malin Liu}, journal={Journal of Aerosol Science}, year={2023}, …

Factors influencing particle agglomeration during solid-state sintering

Agglomeration develops with sintering proves that our numerical method is more reasonable to pre- as shown in the insets of Fig. 2, in which the non-uniformity dict the particle rearrangement than that in Olmos et al. [19]. of the distribution of particles increases and leads to an in- creasing "variance". ...

Sintering and agglomeration characteristics of …

Sintering and agglomeration characteristics of industrially prepared CaMn0.5Ti0.375Fe0.125O3-δ perovskite oxygen carrier in chemical looping combustion …

Agglomeration and Clustering of CaO-Al2O3-MgO Leading …

However, studies that investigated agglomeration are mainly focus on the agglomeration, sintering and clustering of pure inclusions like Al 2 O 3 inclusions while studies that studied complex inclusions mostly focus on the formation and source of single spherical complex inclusions like CaO-Al 2 O 3-MgO inclusions. Additionally, most of ...

The agglomeration, coalescence and sliding of …

The agglomeration, coalescence and sliding of nanoparticles, leading to the rapid sintering of zirconia nanoceramics. Andraž Kocjan, Manca Logar & Zhijian Shen. Scientific Reports...

Iron Ore Sintering: Process

Sintering is a thermal agglomeration process that is applied to a mixture of iron ore fines, recycled ironmaking products, fluxes, slag-forming agents, and solid fuel …

Structure and dynamics of fractal‐like particles …

Coagulation by simultaneous agglomeration and sintering takes place at high temperature environments, where sintering and …

[PDF] Iron Ore Agglomeration Technologies | Semantic …

Iron Ore Agglomeration Technologies. D. Fernández-González, J. Piñuela-Noval, Luis FelipeVerdeja. Published in Iron Ores and Iron Oxide… 20 December 2017. Materials Science, Engineering. Iron Ores and Iron Oxide Materials. Until the 1950s of the last century, the oxidized iron ores that were loaded into the blast furnace had …

The agglomeration, coalescence and sliding of …

further agglomeration and coalescence can lead to rapid sintering, enhanced densification at increased heating rates with limited grain growth can be achieved. The rapid sintering (RS) of the 3YSZ ...

Agglomerative Sintering of an Atomically Dispersed …

Agglomerative Sintering of an Atomically Dispersed Ir1/Zeolite Y Catalyst: Compelling Evidence Against Ostwald Ripening but for Bimolecular and Autocatalytic Agglomeration Catalyst Sintering Steps Journal Article · Tue May 12 00:00:00 EDT 2015 · …

Advances in Sintering and Pellet Technology

Agglomeration processes are typically of three types: pelletizing, briquetting, and sintering. Sintering is a manufacturing technology to make a wide variety of engineering materials, ceramic and …

Study of the Agglomeration Behaviour of Surface-Modified …

Abstract The agglomeration behaviour of Mo powder, especially fine Mo powder, has been a major concern. The degree of powder agglomeration is directly related to the uniformity of Mo and its alloy powder mixtures and related target materials. This study mainly focuses on how to efficiently reduce the soft agglomerates behaviour of Mo …

Sintering and agglomeration of Fe2O3-MgAl2O4 oxygen …

Sintering is a physical process due to crystallite growth, and agglomeration is the cohesion of neighboring particles. Two factors may be associated with this improvement: the higher specific surface areas of oxygen carriers with low ratio of Fe 2 O 3 and higher Tamman temperature of the spinel than iron oxides.

When mechanisms of coalescence and sintering at the …

Sintering is one of the basic processes of the powder metallurgy which, in turn, is one of the basic technologies for material processing. 1 So, it is no wonder that free sintering of nanoparticles (NPs) and sintering of NPs (powders) under external pressure with common heat sources, such as furnace or convection oven, have been studied and …

Nanoparticle processing: Understanding and …

With complete drying, agglomeration sets in and difficult to stop or reverse. Heat treatment of NPs promote sintering due to stress between the NPs that promotes …

Size Distribution Change of Titania Nano-Particle …

In the manufacturing of nanometer-sized material particlulates by aerosol gas-to-particle conversion processes, it is important to analyze how the gas-phase chemical reaction, nucleation, agglomeration, and sintering rates control the size distribution and morphology of particles.

Sintering | SpringerLink

The sintering process can be defined as a thermal agglomeration process that is applied to a mixture of iron ore fines, recycled ironmaking products, fluxes, slag-forming agents, and solid fuel (coke) with the objective of obtaining a product with the suitable characteristics (thermal, mechanical, physical, and chemical) to be fed to the …

Sintering

Sintering 2 2.1 Introduction Sintering is a process that consists in the thermal agglomeration of a mixture of fines that comprise iron ore, recycled iron and steelmaking products, slag-forming elements, and solid combustible (coke). The process has as objective obtaining a

Reversing sintering effect of Ni particles on γ-Mo

Sintering, the term referring to the high-temperature agglomeration of the fine-dispersed metal species in a heterogeneous catalyst 1,2,3,4, is a common...

Factors influencing particle agglomeration during solid-state sintering

Discrete element method (DEM) is used to study the factors affecting agglomeration in three-dimensional copper particle systems during solid-state sintering. A new parameter is proposed to characterize agglomeration. The effects of a series of factors are studied, including particle size, size distribution, inter-particle tangential …

Agglomeration and sintering in annealed FePt nanoparticle …

@article{osti_20719318, title = {Agglomeration and sintering in annealed FePt nanoparticle assemblies studied by small angle neutron scattering and x-ray diffraction}, author = {Thomson, T and Lee, S L and Oates, C J and Toney, M F and Dewhurst, C D and Ogrin, F Y and Sun, S}, abstractNote = {In this work we give a detailed account of …

Effect of composite additives on phase transition and …

The α-Al 2 O 3 prepared by precipitation has good purity and sintering activity, but unfortunately, the agglomeration may occur in the sintering process, so strict control of sintering strategy is required. In the last few decades, various additives have been widely used to control the agglomeration and enhance the dispersion of α-Al 2 O 3.

Agglomeration of Iron Ores | SpringerLink

Agglomeration of iron ores is the iron ore pretreatment process in which the powdery iron ore that cannot be directly fed into a blast furnace experiences high-temperature solidification by sintering process and pelletizing process or low-temperature solidification by pelletizing process and briquetting process to generate the rich ore …

Accelerated sintering in phase-separating nanostructured alloys

Sintering of powders is a common means of producing bulk materials when melt casting is impossible or does not achieve a desired microstructure, and has long been pursued for nanocrystalline ...