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Modification of fluorgypsum as Cement Retarder

Journal of Wuhan University of Technology(Materials Science) 2007年第4期22卷 745-748页

作者：王锦华 School of Materials Science and Engineering Wuhan University of Technology

The chemical composition and mineral structure of fluorgypsum as well as its harm to application in cement were elaborately analyzed. The primary fluorgypsum was modified and its applications in cement＇s production were studied. The technological flow chart of preparing modified fluorgypsum was given. Experimental results indicate that hydration ratio the modified fluorgypsum through adding compound additive for 14d is about 70%. The modified fluorgypsum as cement retarder has certain stimulation to fly ash and increases the strength of compound cement. In addition, its adding amount is lower than that of natural gypsum. The modified fluorgypsum is a good substitute for natural gypsum.

关键词： fluorgypsum industry waste modification cement retarder

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Properties and Mechanism of Mine Tailings Solidified and Filled with fluorgypsum-based Binder Material

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Journal of Wuhan University of Technology(Materials Science) 2012年第3期27卷 465-470页

作者：黄绪泉周旻 Department of Resource and Environmental Science Wuhan University

The properties and microscopic structure of tailings solidification bodies, the hardening mechanism of the fluorgypsum-based binder material （FBBM） and tailings solidification mechanism were investigated. FBBM consisted of 40% fluorgypsum,25%-50% blast furnace slag,10%-35% ordinary Portland cement clinker（OPCC） and 1% activator, which was good material in binding iron ore *** analysis showed that the properties of tailings solidification bodies was related to its ettringite *** and XRD analyses of tailings solidification bodies showed that the chemical reaction was produced between FBBM and tailings in the whole hydration process. The hydration of the resulting gel material covered the surface of the tailings particles and formed a gel structure. A large number of ettringite crystals and the remaining board-like gypsum crystals took each end and constituted the structural skeleton. The filamentous network-like calcium-silicate-hydrate（C-S-H） gel bonded firmly together with ettringite crystals, dehydrated gypsum crystals and granular tailings, and formed an extremely dense whole.

关键词： fluorgypsum tailings solidification body blast furnace slag toxicity ettringite

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The Activation of fluorgypsum with Slag Activator and the Fluorine Solidification Mechanics

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Journal of Wuhan University of Technology(Materials Science) 2011年第5期26卷 1023-1026页

作者：周旻张维昊 School of Resource and Environment Science Wuhan University

The mechanism of activator to fluorgypsum and the fluorine solidification were investigated by the performances of composite binding *** the setting time testing of fluorgypsum with NaOH,Na2SO4 and NaF,the least activator dosage were all 1%.And the cementitious material over 80% of fluorgypsum was processed to improve its quality with slag,fly ash and *** maximum compressive strength of composite binding material was over 12.90 MPa in 28 days,and the concentration of fluroride reduced 64.7% which compared with the pure fluorgypsum binding *** of X-ray diffraction and scanning electron microscopy images showed that ettringite crystals,dihydrate gypsum crystals and C-S-H gel were filled with each *** unreacted CaF2 crystals were embedded by a great deal of network and filamentous C-S-H *** was the main reason that the composite binding material strength improved,water resistance increased and leaching toxicity reduced.

关键词： fluorgypsum activation slag fluorine solidification

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