With this regard, a dynamic model of flash calcination of kaolinite rich clay particles is developed using gPROMS (general PROcess Modeling System) to predict the impacts of calcination temperature and residence time on the transformation of the clay particles and to derive a favorable production path that is able to achieve optimum amount of ...
The physical transformation of powdered kaolinite associated with rapid dehydroxylation during flash calcination has been followed using pycnometry, thermogravimetry, electron microscopy, X-ray powder diffraction and infrared spectroscopy. 116 partially dehydroxylated kinetically-frozen calcines were produced in a laboratory flash calciner …
Flash calcination is a more efficient and innovative technique that consumes less energy, eliminates organic matter, and activates sediment phases, including clay phases, resulting in the attainment of pozzolanic properties [23]. ... Flash calcination of kaolinite rich clay and impact of process conditions on the quality of the calcines: A way ...
The pilot scale flash calciner (POLCAL-2) operates at TRL6 and can be used for thermal treatment of different materials e.g. calcination of carbonic materials (limestone, dolomite, phosphate ore) or activation of clays (kaolin, illite, etc.) or dehydroxilation of metal ores (iron, nickel, titanium, etc.).
Calcination treatment of Li-bearing clay is a necessary step in the ion exchange leaching process, and the calcination temperature has been investigated by using sulfuric acid for leaching (Gu et al., 2020a). The Li-bearing clay calcined at various temperatures (400, 500, 600, 700, and 800 °C) was leached using a 15% ferric sulfate solution at ...
Flash calcination of the clay is performed in an industrial gas suspension calciner under different conditions and the clay samples before and after calcination are fully characterized. In the measured particle size distribution (PSD) for the raw clay sample (as shown in Fig. 2), there is only one major peak, at about 3 μm. ...
This paper, produced by RILEM TC 282-CCL on calcined clays as supple-mentary cementitious materials (working group 2), focuses on the production of calcined clays, presents an overview …
Rotary kilns and flash calciners have been reported to be effective for clay calcination [[46], [47], [48]]. Static calcination techniques have also been used [11]. Higher calcination temperatures have been shown to be tolerable when flash calcination is used [46].
Flash calcination exposes the material to much higher temperature gradients (10 3 –10 5 °C/s) over short periods of time (usually 0·2–1 s),17 leading to a higher specific surface area compared to calcination in a rotary kiln due to the rapid release of water vapor.18 Thus, flash calcination has been found to produce calcined clay with ...
Our FCB Flash Calciner can be used with a wide range of clay materials. Its advanced technology prevents the raw materials from overheating. This is essential for producing highly amorphous pozzolan (an alternative cementing …
Our expert knowledge has shaped the development of two proprietary technologies for clay calcining: FlashCalx™, a suspension calciner, and RotaCalx™, a rotary kiln calcining solution.
Clay calcination FCB Flash calciner. Reducing the cement industry's carbon footprint. Calcined clay is widely recognized as a sustainable substitute for cement clinker in the production of cementing materials.
Flash calcination of kaolinite rich clay particles modeled using gPROMS. The model validated by calcination test results from a gas suspension calciner. Useful time–temperature-transformation ...
Calcined clay capacity then becomes similar to that of clinker production. Case study 2 – converting a wet-pro-cess kiln A mothballed long wet-process kiln was assessed for its potential for clay calcination production. The clay had a 10 per cent LOI, 10 per cent moisture, kaolinite, low-Fe and fine clay. In this case, having a fine feedstock and
A study by Canut et al. [23] investigated the use of flash calcination for clay calcination and found that higher calcination temperatures can be tolerated. Additionally, Nguyen et al. [24] showed that flash calcination results in a lower amorphous content compared to rotary kiln calcination. However, it is important to note that most clay ...
It presents the results of an experimental program carried out with a kaolinitic clay calcined at a flash calciner and at a laboratory furnace. Calcination brings about a drop in specific surface, and an increase of average diameter due to agglomeration, an effect more pronounced in stationary calcination.
The role of activated clay for CO2–low cements. Activated clay plays a key role when it comes to CO2-low cements. In a first step the clay minerals have to be activated in a thermal process at temperatures around 800 °C, leading to an active metaphase of the clay which contributes to the strength development of the final activated clay cement.
Semantic Scholar extracted view of "Calcination of kaolinite clay particles for cement production: A modeling study" by Abraham Teklay et al. ... Flash calcination of kaolinite rich clay and impact of process conditions on the quality of the calcines: A way to reduce CO2 footprint from cement industry.
The tests for the clay calcination proces s were carried out on a laboratory stand with . a power of 12 kW, as presented in F igure 5. The stand, with a circulating fluid ized bed,
Calcined clay; processing; calcination; kiln; flash calciner; low-carbon; energetics; ... The energetics and carbon footprint of clay calcination are also investigated and compared with that of other calcined cement materials. Emerging technologies are also discussed, and potential for the electrification of clay ...
Various clayey materials containing different clay minerals were calcined using muffle furnace and pilot scale flash calciner. While pure clay minerals can be easily calcined using soak calcination, mixed systems, especially Ca/Mg-rich materials, benefit from flash...
The energetics and associated carbon footprint of the calcination process are also discussed, and an outlook on clay calcination is presented, discussing the technological advancements required to ...
The temperature range for successful calcination of a given clay mineral must be high enough to achieve dehydroxylation, but not so high that recrystallisation occurs [145, 154]. ... whereas rotary kiln, and to a lesser extent flash calcination, are used more widely in industry. The main effects of the calcination method are on the particle ...
Flash calcination of a magnesite ore in a free-fall reactor and leaching of magnesia. International Journal of Mineral Processing, Vol. 42, Issue. 1-2, p. 121. ... Flash calcination of kaolinite rich clay and impact of process conditions on the quality of the calcines: A way to reduce CO2 footprint from cement industry. Applied Energy, Vol. 162 ...
This paper presents a study of flash calcination of kaolinite rich clay particles in a pilot scale gas suspension calciner, with the aim to derive useful guidelines on smart …
Process conditions during clay calcination significantly affect the quality and pozzolanic reactivity of the calcines. For instance, flash calcination is found to produce metakaolin with better pozzolanic reactivity than soak calcination does [7]. There is a lack of modeling effort on flash calcination of kaolinite rich clays.
Flash calcination of the clay-rich dredging sediments then took place in a gas suspension calciner and three different calcination temperatures were assessed: 820, 865 and 905 °C. The material was cooled down by a counter flow of cold gas and no crushing or grinding was applied after calcination (Teklay et al. 2015 ; Snellings et al. 2016 ).
Ferreiro et al. analysed the influence of the clay calcination temperature in the flash calcination process and the fineness of raw clay on the workability and strength performance of LC 3. They used two types of clay, which were calcined in two different installations (gas suspension calciner and flash calciner) and at two different temperatures.
This paper presents a study of flash calcination of kaolinite rich clay particles in a pilot scale gas suspension calciner, with the aim to derive useful guidelines on smart calcination for obtaining products of the best pozzolanic properties. Calcination tests are performed in the calciner under six different operation conditions.
Flash calcination is an industrial process based on rapid calcination of a material, for only a few tenths of a second. It can be used for different kinds of materials: magnesite ore (Erşahan et al., 1994), limestone (Ying et al., 2000), and Kaol (Davies, 1984, Gaurier, 1987, Meinhold et al., 1994, Salvador, 1992).