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Bibliographies thématiques / Hemihydrate de sulfate de calcium

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Littérature scientifique sur le sujet « Hemihydrate de sulfate de calcium »

Auteur : Grafiati

Publié le 8 juillet 2023

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Articles de revues sur le sujet "Hemihydrate de sulfate de calcium"

1

MATSUI, Hiroshi, Kayoko AMITA, Genzo HASHIZUME, Gin-ya ADACHI, and Jiro SHIOKAWA. "The formation of needlelike .ALPHA.-calcium sulfate hemihydrate from calcium sulfite hemihydrate." NIPPON KAGAKU KAISHI, no. 12 (1987): 2279–85. http://dx.doi.org/10.1246/nikkashi.1987.2279.

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Liu, Xian Feng, Jia Hui Peng, Jian Xin Zhang, Ming Zheng Chen та Qian Dong. "Effect of Polycarboxylicacid Plasticizer on Characteristics of α-Calcium Sulfate Hemihydrate". Applied Mechanics and Materials 423-426 (вересень 2013): 1085–89. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.1085.

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Purpose: studied the mechanism of polycarboxylicacid plasticizing effect on α-calcium sulfate hemihydrate. Methods: the adsorbed amount was tested by ultraviolet visible absorption spectrum method, ζ potential was measured by micro-electrophoresis analysis, and the corresponding workability was studied. Results: firstly, polycarboxylicacid plasticizer was adsorbed on α-calcium sulfate hemihydrate by Van Der Waals force and the saturated adsorption quantity of polycarboxylicacid plasticizer (HC) was about 5.8mg/g; secondly, the decisive factor for polycarboxylicacid plasticizer to disperse α-ca

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3

Feng, Yan, Rongxin Guo та Zhiwei Lin. "Effect of Aluminum Sulfate and Succinic Acid on the Growth Law of α-Calcium Sulfate Hemihydrate under Microwave Irradiation". Advances in Materials Science and Engineering 2021 (12 квітня 2021): 1–13. http://dx.doi.org/10.1155/2021/6630638.

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The existing α-hemihydrate gypsum preparation process has low production efficiency and high energy consumption. In this paper, α-type hemihydrate gypsum was prepared by microwave irradiation using phosphogypsum as the raw material, calcium chloride solution as the reaction medium, and succinic acid and aluminum sulfate as crystal-transforming agents. Both aluminum sulfate and succinic acid were studied to determine the mechanism influencing the effect on the growth of α-type hemihydrate gypsum crystals. This study found that, without added succinic acid or aluminum ions, the crystal transform

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MATSUI, Hiroshi, Genzo HASHIZUME, Gin-ya ADACHI, and Jiro SHIOKAWA. "Formation of prismatic .ALPHA.-calcium sulfate hemihydrate during oxidation of calcium sulfite hemihydrate." NIPPON KAGAKU KAISHI, no. 6 (1988): 892–98. http://dx.doi.org/10.1246/nikkashi.1988.892.

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Wang, Yu Bin, Le Yu, Hua Wang, and Ting Shu He. "Effect of Sodium Citrate on the Hydration Capacity of Hemihydrate Calcium Sulfate Whiskers." Applied Mechanics and Materials 584-586 (July 2014): 1618–21. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.1618.

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The influence of sodium citrate on the hydration capacity of hemihydrate calcium sulfate whiskers was investigated. The products were characterized by FTIR, SEM and XRD.The results show that the absorption of the sodium citrate on the surface of the hemihydrate calcium sulfate whiskers is not uniform, and the adsorption state also changed with the amount of sodium citrate. Sodium citrate plays role on the hydration capacity of hemihydrate calcium sulfate whiskers.

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Liu, Xian Feng, Jia Hui Peng, Ming Zheng Chen, Leng Bai та Liu Liu. "Effect of Butane Diacid on Crystal Morphology and Reaction Process of α-Calcium Sulfate Hemihydrate in Preparation from Flue Gas Desulphurization Gypsum". Advanced Materials Research 838-841 (листопад 2013): 2681–84. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.2681.

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Modifying crystal morphology was the key technology of the preparation of α-calcium sulfate hemihydrate from flue gas desulphurization gypsum using the hydrothermal method under atmospheric pressure. For exploring the mechanism of butane diacid effect on crystal morphology of α-calcium sulfate hemihydrate in preparation from flue gas desulphurization gypsum, the crystal morphology, convert ratio, and reaction process of α-calcium sulfate hemihydrate were studied by scanning electron microscope observation, and crystal water testing. The results showed, firstly, crystal modifier made the growth

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7

Zhu, Xin Feng, Yu Bin Wang, Xiao Wang, and Liu Shuan Yang. "Integration of Preparation and Stabilization for Hemihydrate Calcium Sulfate Whiskers." Advanced Materials Research 239-242 (May 2011): 3074–77. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.3074.

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The integration process of hemihydrate calcium sulfate whiskers with optimum additives was carried out, and the influence of reagents on the crystal shape and stability of hemihydrate calcium sulfate whiskers was investigated too. The products were characterized by FT-IR, SEM and XRD.The results show that the integration of preparation and stabilization of hemihydrate calcium sulfate whiskers can be achieved with addition of 0.025% sodium stearate and 0.15% sodium oleate by adding agents in different steps.

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Chen, Chang, Yu Bin Wang, Le Yu, Ying Jie Song, Shan Shan Zhang, and Ai Zhang. "Hydration Ability of Hemihydrate Calcium Sulphate Whiskers with Different Content of Sodium Phosphate." Applied Mechanics and Materials 638-640 (September 2014): 1346–49. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.1346.

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Different content of sodium phosphate was added into the hemihydrates sulphate whiskers for 30 min to 2h of standing time. The treated products were researched by SEM, TG-DSC and XRD. The results indicate that when the dosage of sodium phosphate was more than 0.10%, the morphology of hemihydrate calcium sulphate whisker was fully maintained. However, the crystal structure of the products had changed and the half water calcium sulfate turned into of dihydrate calcium sulphate when 0.10 wt% sodium phosphate added. With the increase of standing time, half water calcium sulfate whisker converted i

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9

Wang, Xiao, Yu Bin Wang, Liu Shuan Yang, Xiao Fei Wang, and Jia Kuan Yang. "Stabilization Effect of Sodium Phosphate on Hemihydrate Calcium Sulfate Whiskers." Advanced Materials Research 287-290 (July 2011): 535–38. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.535.

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Stabilization effect of sodium phosphate on crystalline phase and crystal shape of hemihydrate calcium sulfate whiskers was investigated. Morphology, thermal stability and phase composition of stabilized hemihydrate calcium sulfate whiskers were characterized by means of SEM, DSC-TG and XRD respectively. Results indicated that crystalline shape of hemihydrate calcium sulfate whiskers could be invariable in two hours at 100 °C with addition of 0.10 wt % sodium phosphate for 20 min. Meanwhile sodium phosphate had a good effect on whiskers morphology stabilization.

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10

Dai, Hao, Shu Peng Zhang, Cheng Lan Ju, and Dong Xu Li. "Influence of Calcium Sulfate Varieties on Properties of Calcium Aluminate Cement-Based Self-Leveling Mortars." Key Engineering Materials 680 (February 2016): 455–61. http://dx.doi.org/10.4028/www.scientific.net/kem.680.455.

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The effect of calcium sulfates varieties on the properties of calcium aluminate cement-based self-leveling mortar have been investigated, and the hydration kinetics, hydrated products and microstructures are characterized by isothermal calorimeter, X-ray diffraction and mercury intrusion porosimetry, respectively. The results show that the technological properties of mortars are significantly affected by calcium sulfate varieties and content. The setting times are shortened drastically with the addition of calcium sulfates. Mortars with hemihydrate show higher early strength and less drying sh

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