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mineral caused by sulfate attack, which has been increasingly found in cement-based materials exposed to sulfates. Thaumasite is a calcium silicate carbonate sulfate hydrate (CaSiO3?CaCO3?CaSO4?15H2O... sample analysis (mg/L) From the result listed in Table1, one can find that there are sulfate ion, calcium ion, magnesium ion, sodium ion and a small quantity of chloride ion in the water sample......
Gypsum crystallization and potassium chloride regeneration by reaction of calcium chloride solution with potassium sulfate solution or solid PENG Cui(彭 翠), ZHANG Fu-li(张福利), GUO Zhan... examination is needed beyond this temperature range in the future work. Researchers have done a lot of works on the phase conversion of calcium sulfate dihydrate to hemihydrates or anhydrate......
. 3.2 文献标识码:A Inhibition of calcium sulfate scale formation in pipes of brine WANG Hong-qing 1, BAO Zong-hong1, DUAN... of CaSO4 scale formation in concentrated NaCl-Na2SO4 brines was studied. The cause of scale formation was obtained by measuring the solubility of calcium sulfate dihydrate in the industrial brines(NaCl......
Thermodynamic Stability of Sulfate Ions on Calcium Aluminosilicate Hydrate Microstructure胡晨光1,2,DING Qingjun3,FENG Xiaoxin11. College of Materials Science and Engineering,North China University... 要:The thermodynamic stability of sulfate ions on synthesized calcium aluminosilicate hydrate(C-A-S-H) microstructure with different Ca/Si ratios and Al/Si......
of specimens are caused by the formation of gypsum, not by ettringite. The decompositions of calcium carboaluminate are caused by sulfate attack and lead to further deterioration of specimens. The main reasons... with ground limestone can not be used and ground limestone can not be used as mineral additives added to concrete. Key words: ground limestone; gypsum; calcium carboaluminate; sulfate attack ......
reacting with calcium hydroxide in high sulfate environment. Plenty of ground water permeates concrete lining and accumulate on windward-side. Under tunnel environment, the evaporation of ground water... investigation, sodium sulfate is the predominant salt involved in groundwater in southwest of China. The formation of gypsum in concrete may lead to the increase of stress. The calcium carbonate (CaCO3......
Preparation, Characterization, and Formation Mechanism of Calcium Sulfate Hemihydrate Whiskers王舒州1,陈德玉1,ZHANG Keke21. School of Materials Science and Engineering, Southwest University of Science and Technology2. Institute of Chemical Engineering, Nanjing University of Science and Technology摘 要:Calcium sulfate hemihydrate whiskers were synthesized......
J. Cent. South Univ. (2018) 25: 2349-2359 DOI: https://doi.org/10.1007/s11771-018-3919-0 Safe utilization of chromium-bearing vanadate residue by recovery of vanadium and chromium based on calcium... solution. Results indicate that the stability of calcium vanadate and calcium chromate depends on pH and [HCO3-]. CaV2O6·4H2O transforms into CaV2O6·4H2O, CaV2O6·2H2O, CaV2O6, Ca2V2O7·2H2O, and Ca5(VO4)3(OH......
tailings and preparation of calcium sulfate whiskers ZHANG Liqing, ZHAO Lingyan, ZHOU Huafeng, YUAN Benfu (Key Laboratory of Rare-earth Chemistry and Applying Liaoning Province, Shenyang University.... The undissolved rare earths in the tailings and calcium sulfate were concentrated in acid-insoluble residues. After solid-liquid separation, calcium sulfates were dissolved in dilute hydrochloric acid......
of ilmenite in Panzhihua. However, due to its high content of calcium and magnesium, only the sulfate process can be adopted to produce white pigment. Hydrolysis of industrial titanyl sulfate solution (TiOSO4... Influence of hydrolysis in sulfate process on titania pigment producing TIAN Cong-xue(田从学)1, 2, DU Jian-qiao(杜剑桥)1, CHEN Xin-hong(陈新红)1, MA Wei-ping(马维平)1, LUO Zhi-qiang(罗志强)1, CHENG Xiao-zhe(程晓......
