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Showing 1 to 20 of 32 for “"calcium sulfate"”.
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Heat treatment and hydration of calcium sulfate
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1937.
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Laboratory Scale Study of Calcium Sulfate Hydration Forms
… better understand the dehydration properties of calcium sulfate dihydrate, and the hydration of calcium sulfate hemihydrate as well as anhydrous calcium sulfate. The lab-scale kinetics of these processes were studied using thermogravimetric analysis and sorption analysis. Scanning electron …
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Removal of calcium sulfate deposits from waste acid treatment facilities
… and evaluate three methods for determination of sulfate and to use the obtained information as a guide in selecting an accurate analytical method with which to conduct a complete analysis of calcium sulfate deposits. The investigation of the analytical methods revealed that the gravimetric method …
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Treatment of enchondroma of hand using calcium sulfate and autobone grafting
… Therefore, we studied the efficacy of injectable calcium sulfate as bone substitute and compared the results with autobone grafting. MATERIAL & METHOD: Thirty six patients with solitary enchondroma of the hand were enrolled the study. Among them, 14 were treated with auto-bone and, 22 with calcium …
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Evaluation of the in vitro elution characteristics of carboplatin-impregnated calcium sulfate beads
… elution of platinum from carboplatin-impregnated calcium sulfate hemihydrate (CSH) beads in vitro. Sample: Sixty carboplatin-impregnated CSH beads and 9 CSH beads without added carboplatin (controls) Procedures: Carboplatin-impregnated CSH beads (each containing 4.6 mg carboplatin [2.4 mg …
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Fracture healing : the effects of local insulin delivery via calcium sulfate and tricalcium phosphate
… the normal fracture model of the BB Wistar rat. Calcium sulfate and tn-calcium phosphate have osteoconductive properties that support bone growth. These materials served as carriers to provide continuous insulin release at the fracture site. The vehicles were evaluated for insulin content at days …
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Evaluation of carboplatin-impregnated calcium sulfate hemihydrate beads as a local treatment option for feline injection site-associated sarcomas
… generated by elution of carboplatin-impregnated calcium sulfate hemihydrate (C-I CSH) beads. Sample: Five immortalized cell lines from histologically confirmed, primary FISASs. Procedures: For each cell line, one 96-well microplate was used for each time point (24, 48, 72 hours). In each …
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ΣΧΗΜΑΤΙΣΜΟΣ ΘΕΙΙΚΟΥ ΑΣΒΕΣΤΙΟΥ ΣΕ ΥΔΑΤΙΚΑ ΔΙΑΛΥΜΑΤΑ
IN THIS THESIS, WE STUDY THE PRECIPITATION OF CALCIUM SULFATE FROM AQUEOUS SOLUTIONS AT SUPERSATURATIONS SUFFICIENT FOR SPONTANEOUS PRECIPITATION AND IN THE TEMPERATURE RANGE BETWEEN 20 -80 C. AT THESE CONDITIONS, THE ONLY PHASE FORMING WAS CALCIUM SULFATE DIHYDRATE. THE INDUCTION PERIODS AND THE …
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Gypsum scale formation on a heated copper plate under natural convection conditions and produced water remediation technologies review
… treatment technologies. Formation of dihydrated calcium sulfate scale, also known as gypsum, on a heated copper plate is studied in lab. The copper plate, held at a given temperature, is immersed in a supersaturated solution of calcium sulfate prepared at a given concentration. The flow …
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Crystal seeding for the control of sludge properties
… of certain variables on the filterability of calcium sulfate sludge resulting from lime neutralization of synthetic, return sludge seeded, sulfuric acid samples, The variables investigated were rate of mixing, rate of lime addition, degree of neutralization, return sludge loadings and acid …
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Relationships of Watershed Climate and Geochemical Processes to Trophic Characteristics in Texas Reservoirs
… solids (TDS) with the ratio of sodium to calcium plus sodium. These classes were delineated into West, Central, and East geographic groups, corresponding with high, intermediate, and low TDS ranges, respectively. Alkalinity, pH, conductivity, calcium, sulfate, and chloride data further …
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Crystallization of calcium sulphate during phosphoric acid production : improving filtration through improvement in particle shape and size distribution
… process produces a side product of calcium sulfate hydrates, which become the filter media in the subsequent acid separation process. For most industrial processes, the dihydrate form of calcium sulfate crystals (gypsum) precipitates and its shape and size distribution are key …
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Ferric chloride from crude copperas
Ferrous sulfate, commercially known as copperas, is a by-product of many industries such as the steel industry where steel is “pickled” in sulfuric acid previous to galvanizing, and in ore refining where sulfuric acid is used to remove undesirable impurities consisting chiefly of iron materials. …
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A Hazard Assessment of a Landfill Site
… open-cast site to which filter cake containing calcium sulfate was deposited as the only known industrial waste. Geological mapping of the site was carried out followed by search bar surveys to determine the area where passive venting of methane, carbon dioxide and hydrogen sulfide occurred. The …
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A study of the comparative methods for the rare earth determination in bones and the rare earth content in human bones
… Three methods, the W.C. Robinson Method, the Calcium Sulfate Method, and the Oxalic Acid Method, for the chemical separation of the rare earth group from the other elements in bone ash have been investigated and the difficulties of each of the methods have been cited. A method separation based …
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Rheological properties of candle filter deposits at elevated temperatures and pressures
… revealing a system in which smaller magnesium sulfate particles adhere to the surface of larger calcium sulfate crystals, and apparently densifying more at higher magnesium sulfate compositions.
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Experimental Investigations on Non-Wetting Surfaces
… fouling conditions. LIS are shown to mitigate calcium sulfate and calcium carbonate fouling under laminar conditions. The results of the study bear profound benefits to reducing the levelized cost of condensers and water uptake in thermoelectric power plants, that currently consume about 50% of …
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Optimizing a hybrid reverse osmosis/electrodialysis system for natural organic matter concentration
… ion exchange properties of ED membranes, sodium sulfate and sodium chloride were added at different time points and amounts in order to optimize the retention and concentration of NOM. It was found that a high concentration of sodium chloride displaced NOM that had adsorbed to anion exchange …
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Efficacy of Feeding Treatments and Litter Formulations Against Shedding of Salmonella in Broilers
… consisted of the combination of acidic calcium sulfate (ACS) with either diatomaceous earth (DE) or hydrated sodium calcium aluminiosilicate (HSCAS). Feed additions consisted of differing amounts of sodium bisulfate. For the litter amendment experiments, chicks were placed into pens in …
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Selective salt recovery from reverse osmosis concentrate using inter-stage ion exchange
… the number of bed volumes to breakthrough of calcium, magnesium, and sulfate. Model and regression relationships were verified by a series of column experiments. Attempts to separate ions during the regeneration process were not successful. Ion distribution within a loaded column was …
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