thermochimica acta ELSEVIER Thermochimica Acta 282/283 (1996) 483-492 The thermal dehydration of natural gypsum and pure calcium sulphate dihydrate (gypsum)l a,*, C.A. Strydom D.L. Hudson-Lamb aDepurtment …
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— Some natural processes can seal porous rocks, cracks, and joints in soil formations. The precipitation of sparingly soluble calcium salts can either stop the flow of brines into mines or isolate particularly contaminated areas. Gypsum (CaSO4‧2H2O), which has a low solubility in water (2.6 g/L at 25 °C), creates a long-lasting insulating layer. …
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— The kinetics of calcium sulfate dihydrate spontaneous precipitation in supersaturation solutions for temperatures ranging between 20 and 70°C was investigated The quartz microbalance technique (QMC) was used. From measurements of the induction period for gypsum nucleation, interfacial tension ... Role of temperature in spontaneous ...
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— Our soil amendments are safe, all-natural, and can be used in organic or conventional farming. Our organic gypsum product, OMRI-listed* selenite (also known as Calcium Sulfate Dihydrate), is vital for assisting in the following three areas of soil improvement: repairing damaged soils, improving soil structure, and increasing crop yields.
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Gypsum: A Versatile Mineral. Gypsum, scientifically known as Calcium Sulfate Dihydrate (CaSO 4 ·2H 2 O), is a naturally occurring mineral primarily formed from the evaporation …
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— The effects of silica colloids on calcium sulfate dihydrate (gypsum, CaSO4·2H2O) crystallization are studied using feed solutions of varying degrees of supersaturation. A combination of light transmittance and electrical conductivity measurements is employed to characterize various aspects of the crystallization …
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— The industrial byproduct gypsum is a general term for byproducts discharged from industrial production with calcium sulfate as the main ingredient. Due to the high number of impurities and production …
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The formation and adherance of calcium sulfate dihydrate, hemihydrate, and anhydrite scales is a problem in many heat exchanger applications where the equipment is fed with waters containing high levels of calcium and sulfate. ... Ebrahimpour A, Perez L, Smesko AA, and Nancollas GH, "The Dual Role of Polyelectrolytes and Proteins as ...
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— Gypsum is a naturally occurring mineral composed of calcium sulfate dihydrate. It is widely used in the construction industry, particularly in the production of gypsum board (also known as drywall or plasterboard), which is a key material for interior walls and ceilings. ... Building Project in Oman. 29-07-2024. read more. Benefits of …
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— The alite sample was burnt four times at 1600 °C. The X-ray diffraction pattern and chemical composition of synthetic alite are given in supplementary materials (Fig. S1 and Table S1). The gypsum selected was the analytical reagent calcium sulfate dihydrate (Kermel Co., Ltd) with a purity exceeding 99%.
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The American Concrete Institute. Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for …
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Gypsum, a naturally occurring mineral with the chemical formula CaSO4·2H2O, exhibits several important chemical properties that contribute to its versatility and usefulness in various applications. Here are some key chemical properties of gypsum: 1. Hydrated Structure:Gypsum is a hydrated …
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— The comprehension of the mechanisms of nucleation and growth that regulate the gypsum (calcium sulfate dihydrate) precipitation is fundamental to prevent scaling problems. The present paper reports measurements of the induction period for gypsum nucleation when citric acid is added in solution as an additive to retard scale …
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— Gypsum is one of the most important minerals on earth, and its dehydration product, plaster of paris, is mainly used as a building material. Furthermore, there are abundant deposits of gypsum mineral in nature; moreover, recent studies have indicated that Mars also has an abundance of gypsum mineral as well as other mineral calcium …
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— Semantic Scholar extracted view of "Preparation of hemihydrate gypsum with controllable morphology in Glycerol-NaCl-Water solutions with maleic acid" by Gaoxiang Chen et al. ... Solubility and Physical Properties of Calcium Sulfate Dihydrate in NaCl and Glycerol Aqueous Solution at 303.15, 323.15, and 343.15 K ... Role and fate of the lead ...
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— The effects of inorganic impurities on the crystallization of calcium sulfates in strong HCl (6.3 mol L–1)-CaCl2 (1.8 mol L–1) solutions were investigated. The impurities considered relate to hydrochloric acid leaching of apatite-type ores for the extraction of rare earth elements. The impurities investigated were K+, Mg2+, Sr2+, Ba2+, Al3+, Fe2+, …
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— The kinetics of calcium sulfate dihydrate spontaneous precipitation in supersaturation solutions for temperatures ranging between 20 and 70°C was investigated The quartz microbalance technique ...
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— Gypsum is a soft sulfate mineral made up of calcium sulfate dihydrate. This naturally occurring mineral has been utilized in construction for millennia. ... nature, and advantages in terms of safety and …
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— Primarily, gypsum is used for helping to break up heavily compacted clay soils making them more porous and able to absorb moisture. This is particularly helpful in areas prone to drought. The …
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— Gypsum is one of the most widely-used building materials in the world. It is applied in several interior building uses, including in wallboard. Normally, calcium sulphate dihydrate (CaSO 4 •2H 2 O) is used as a raw material and a subhydrate such as hemihydrate (CaSO 4 •0.5H 2 O) or anhydrite (CaSO 4) is produced. The subhydrate is …
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Calcium sulfate occurs in nature in form of three different minerals distinguished by the degree of hydration: gypsum (CaSO4·2H2O), hemihydrate (CaSO4·0.5H2O) and anhydrite (CaSO4).
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— The changes from gypsum to anhydrite and back to gypsum are common processes (Klimchouk, 2000). This way, James (1992) noted that in very hot climates gypsum can dehydrate to anhydrite when it is ...
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Gypsum panel products, the family of products that includes wallboard or drywall, play a crucial role not only in the appearance of a building but also in how a structure performs under the most extreme circumstance—fire. …
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— The associated effect of sodium chloride and dihydrate gypsum on the mechanical performance of a slag-based geopolymer activated by quicklime was investigated by compressive strength, shrinkage, and square circle anti-cracking tests of mortar with a 0.5 water–binder ratio and a 1:3 binder–sand ratio, as well as paste …
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— Crystallization of calcium sulfate dihydrate (CaSO4·2H2O, gypsum) in sodium chloride solutions has been studied in the presence of magnesium ion. It was shown that Mg2+ has an inhibiting effect on the two stages of precipitation: nucleation and growth. Kinetic results were explained on the basis of the strong effect of magnesium ions on …
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— In this paper, the dihydrate–hemihydrate recrystallization method was employed to produce β-hemihydrate gypsum. The effects of thermodynamic conditions such as temperature, sulfuric acid concentration, and phosphoric acid concentration on the removal of F and P impurities were investigated. Kinetic studies revealed that the …
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The fastest growing export markets for Gypsum of Oman between 2021 and 2022 were India ($25.7M), Nepal ($2.29M), and Indonesia ($1.5M). Imports In 2022, Oman imported $559k in Gypsum, becoming the 130th largest importer of Gypsum in the world. At the same year, Gypsum was the 854th most imported product in Oman.
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— Gypsum is one of the important construction materials in Iraq in plastering surfaces and gypsum board, the ability of gypsum to give a comfortable an aesthetic ambiance as a construction material ...
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— In addition, gypsum played the role of sulfate excitation to active Al 3+ and promoted the generation of AFt. Meanwhile, the C-S-H gel and AFt played the role of …
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— At the current rate of growth in exports, Oman's share is projected to rise to around 48 - 50 per cent of demand, which equates to over 130 million MT over the 2022- 2031 timeframe.". Thailand has …
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