The formation process of aluminum hydroxide in calcium sulfoaluminate pastes

Song, Fei; Lü, Yinong; Qin, Honggang; Liu, Yunfei; Xiao, Jiumei; Liu, Wenjuan

doi:10.1007/s11696-020-01351-7

Cited by 5 publications

(3 citation statements)

References 44 publications

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“…Gypsum both controls the hydration process of C 4 A 3 $ and changes the ratio of the main hydrates (AFt and AFm) [33][34][35]. Calcium hemicarboaluminate hydrate (C 4 AČ 0.5 H 12 , Hc), which belongs to the AFm family, forms when the calcite content of cement pastes is low or zero [36][37][38]. The excellent binding performance of C 4 A 3 $ is attributed to the rapid formation of AFt skeleton structure, and the precipitation of other hydration products.…”

Section: Introductionmentioning

confidence: 99%

The effect of boron oxide on the microstructure and hydration of calcium sulfoaluminate phase

Song

Lyu

et al. 2023

Mater. Res. Express

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Boron-rich waste causes numerous environmental problems when discharged directly into the environment. Here, various quantities of boron oxide (B2O3) were added to calcium sulfoaluminate (C4A3$) during the sintering process to demonstrate a potential use of boron-rich waste. The microstructure and hydration performance of C4A3$ with various B2O3 contents were investigated with scanning electron microscopy, X-ray diffraction, isothermal conduction calorimetry, thermogravimetric studies and compressive strength tests. B2O3-doped C4A3$ had a larger grain size than the pure phase; and were surrounded by amorphous phases. The presence of B2O3 was shown to promote the phase transition process through which C4A3$ changes from the orthorhombic to the cubic structure; and the substitution of Al3+ for B3+ in AlO4 tetrahedra was surveyed by structural refinements. As the B2O3 content increased, the induction period of C4A3$ increased while the hydration rate decreased because of the amorphous phases around the C4A3$. However, the hydration degree of doped C4A3$ increased due to the slower reaction rate. Thus, when an appropriate amount of B2O3 was added to the C4A3$ during sintering, a significant improvement in the compressive strength of pastes was observed.

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Section: Introductionmentioning

confidence: 99%

The effect of boron oxide on the microstructure and hydration of calcium sulfoaluminate phase

Song

Lyu

et al. 2023

Mater. Res. Express

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“…Zhang et al 17 compared the flow field characteristics of the dynamic impinging stream and steady‐state impinging stream by numerical simulation, and the results showed that turbulence kinetic energy was higher in the dynamic impinging stream, which could enhance the fluid mixing effect. The unsteady impinging stream is of great significance for prolonging the residence time of particles and strengthening the mixing of the flow field 12, 13. Therefore, the mixing mechanism of the dynamic impinging stream and the relationship between flow pattern and mixing characteristics need to be further studied to improve the fluid dynamics theory of the impinging stream.…”

Section: Introductionmentioning

confidence: 99%

Flow Pattern and Mixing Performance of a Dynamic Impinging Stream Reactor

Zhang

Rui

et al. 2023

Chem Eng & Technol

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The mixing process of a dynamic impinging stream reactor was measured by planar laser induced fluorescence. The fluid flow pattern and mixing characteristics were studied under different conditions. The flow field was divided into the following regions by flow pattern: free jet region, impingement region, radial jet region, and radial vortex region. The mixing characteristics were analyzed under different operational conditions. The mixing time first decreased and then increased with increasing nozzle spacing. The mixing time decreased with increasing outlet velocity difference and outlet average velocity, and the optimal working conditions were nozzle spacing L = 4d, where d is nozzle diameter, outlet velocity difference vd = 1 m s−1, and outlet average velocity vp = 1.7 m s−1.

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“…Because it can significantly improve heat and mass transfer performance, it has become an important technical instrument in chemical production and various process industries 1, 2. It has been widely used in mixing, burning, absorbing, extracting, drying, and preparing ultrafine powders 3–8. Over the years, many researchers have conducted simulations and experiments to continuously develop the theoretical system of impinging streams.…”

Section: Introductionmentioning

confidence: 99%

Study on the Turbulent Vortex Structure Characteristics of a Two‐Layer Impinging Stream Reactor

Zhang,

Liu,

Dong

et al. 2023

Chem Eng & Technol

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The structure of the turbulent vortex in a two‐layer impinging stream reactor was studied by large eddy simulation. The distributions of vortex intensity, turbulent kinetic energy, and shear stress at different Reynolds numbers Re, nozzle spacings L, and nozzle layer spacings are discussed. The relationship between vortex structure and mixing effect in the flow field is revealed. The effects of longitudinal swirls and shear flow characteristics are analyzed. Finally, the field synergy theory is used for evaluation. With increasing Re, the vortex intensity and average shear stress increase. The nozzle spacing and layer spacing affect the mixing effect in the reactor by controlling the change of vortex structure in the flow field. When L/D = 3, where D is the nozzle diameter, the energy loss is the smallest and the mixing effect is the best. The research results provide a theoretical reference for the structural optimization of the impinging stream reactor.

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The formation process of aluminum hydroxide in calcium sulfoaluminate pastes

Cited by 5 publications

References 44 publications

The effect of boron oxide on the microstructure and hydration of calcium sulfoaluminate phase

The effect of boron oxide on the microstructure and hydration of calcium sulfoaluminate phase

Flow Pattern and Mixing Performance of a Dynamic Impinging Stream Reactor

Study on the Turbulent Vortex Structure Characteristics of a Two‐Layer Impinging Stream Reactor

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