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Effect of Nitrate Salts on Solubility Behavior of Calcium Sulfate Dihydrate (Gypsum) in the Aqueous Sodium Chloride System and Physicochemical Solution Properties at 308.15 K. Journal of Chemical & Engineering Data 2014, 59 (3), 832-838.
The regeneration of calcium oxide from gypsum is the interest of this research. Gypsum was converted to calcium oxide via a two-step process involving chemical and thermal reactions. X-ray diffraction (XRD) was used to analyse the samples to identify the samples. Laboratory grade gypsum (LG) and waste gypsum (WG) were used in this research …
The most prevalent sulfate mineral in the surrounding natural environment is calcium sulfate, which can be found as calcium sulfate dihydrate or gypsum (CaSO 4 ·2H 2 O), hemihydrate (CaSO 4 ·½H 2 O), and anhydrite (CaSO 4). All of these forms have the ability to be crystallized in the presence of water [11,12].
Composition: Calcium sulfate dihydrate (CaSO₄·2H₂O). This means gypsum is a hydrated sulfate mineral, containing calcium, sulfur, and chemically bound water molecules. …
phosphate dihydrate product with minimal iron, magnesium, and aluminum contamination, while also producing value-added calcium sulfate dihydrate (gypsum) and iron/magnesium byproducts. This process enables economical and sustainable recovery of phosphorus from low-grade ores, which can address the rising global demand for food …
1.78 and 2.09 for calcium sulfate anhydrite and calcium sulfate dihydrate 2.2 Gypsum Deposition Protocol Supersaturated solutions of calcium sulfate were prepared in a double-walled, water jacketed crystallization cell of about 980 mL capacity. The calcium sulfate solution has the
Phosphogypsum is a by-product of phosphoric acid production by a wet-process and can be used to prepare adsorption materials to treat Cd(II) in sewage. Its main component is calcium sulfate dihydrate (gypsum). In the present study, incorporation and adsorption of cadmium on gypsum in an aqueous environment have been investigated …
From a chemical point of view it is Calcium Sulphate Dihydrate (CaSO4.2H2O) deposited in sedimentary layers on the sea bed. ... The content of Gypsum in sedimentary rock varies from 75% to 95%, the rest being clay and chalk. The word gypsum is derived from the Greek word γύψος (gypsos), "plaster". ... Calcium Oxide/Lime (CaO): 31% - 32.10% ...
The search for effective technological operations to stabilize technical characteristics used in producing gypsum binders has received a great deal of attention in recent years owing to the instability of calcined gypsum properties [1]. Gypsum hemihydrate is a material used in the building industry and produced by means of calcinating gypsum.
The decomposition of calcium sulfate dehydrate results in sulfur oxide and calcium oxide. Gypsum is a mineral categorized as a calcium sulfate mineral, and its chemical formula is calcium sulfate dihydrate, CaSO 4 2H 2 O. However, a broader definition includes all the calcium sulfates, including calcium sulfate hemihydrate, which is known as ...
Oman Gypsum quarry is located 19 km South of Thumrait city, Salalah. Thumrait is the nearest city. ... Calcium Oxide CaO % 40.61. Soluble magnesium Mg O% 0.056. …
Gypsum is calcium sulfate (CaSO 4).Refined gypsum in the anhydrite form (no water) is 29.4 percent calcium (Ca) and 23.5 percent sulfur (S). Usually, gypsum has water associated in the molecular structure (CaSO 4 ·2H2O) and is approximately 23.3 percent Ca and 18.5 percent S (plaster of paris). Gypsum fertilizer usually has other impurities …
1. Introduction. Gypsum products are created from two simple reactions [1]: (1) the calcination reaction − CaSO 4 ·2H 2 O + heat → CaSO 4 ·½H 2 O + 3/2H 2 O (g), and (2) the rehydration reaction − CaSO 4 ·½H 2 O + excess water → CaSO 4 ·2H 2 O + excess water (g).. An ore of calcium sulfate dihydrate should exhibit four distinct …
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 …
Currently, the precipitation of calcium sulfate dihydrate (gypsum) has been the subject of numerous investigations [10], but the characteristics and mechanisms of gypsum precipitation under various compositions of solutions and operating conditions are not completely understood. ... The higher soluble F content resulted in a more …
The effect of addition of aliphatic alcohols (methanol, ethanol, and isopropyl alcohol) on the dissolution characteristics of calcium sulfate dihydrate (gypsum, CaSO 4 ·2H 2 O) in brines has been ...
The hydration of calcium sulphate hemihydrate (CaSO 4 ·0.5H 2 O) leading to the crystallization of gypsum (calcium sulphate dihydrate – CaSO 4 ·2H 2 O) has been the subject of several investigations over a long period and a vast amount of data is widely distributed throughout in the literature. In this review article an overall picture of the …
The most prevalent sulfate mineral in the surrounding natural environment is calcium sulfate, which can be found as calcium sulfate dihydrate or gypsum (CaSO 4 ⋅2H 2 O), …
The most prevalent sulfate mineral in the surrounding natural environment is calcium sulfate, which can be found as calcium sulfate dihydrate or gypsum (CaSO 4 ⋅2H 2 O), hemihydrate (CaSO 4 ⋅ ...
Calcium sulfate. J L RICCI, ... H ALEXANDER, in Bioceramics and their Clinical Applications, 2008. 14.2.1 Gypsum and its derivatives. CS cements begin as gypsum, or calcium sulfate dihydrate (CaSO 4 · 2H 2 O), which is either mined from the earth or produced through more controlled chemical processes (Randolph, 1971).Gypsum and …
The regeneration of calcium oxide from gypsum is the interest of this research. Gypsum was converted to calcium oxide via a two-step process involving chemical and thermal reactions. X-ray diffraction (XRD) was used to analyse the samples to identify the samples.
Al Jood has a permanent stockyard inside the port of Salalah. Al Jood is the 5th largest exporter of natural gypsum from Oman. Al Jood produces four sizes: 0-20mm, 20 …
In seawater of the Arabian Gulf, the concentration of calcium ions varies from 225 to 500 mg/L [18].Considering the percentage RO recovery of 30–70%, the …
The Gypsum stone Powder is a mineral formed by di-hidrated calcium sulphate. In its crystalline structure there are two water molecules by one of calcium sulphate. Put …
1. Introduction. In contrast to Portland cement (PC), calcium aluminate cement (CAC) generally exhibits rapid strength development and resistance to sulphates [1], acid [2], and fire [3].It is thus widely employed as concrete/mortar to immobilise hazardous materials [4], inhibit the growth of microorganisms [5], and resist carbonation …
Gypsum products (calcium sulfate dihydrate, CaSO4·2H2O) were synthesized through an eco-friendly and low-cost process by two different renewable calcium carbonate sources (CaCO3), hen and duck eggshell wastes, with product yields obtained of 84.73 and 87.74%, respectively. The X-ray fluorescence results indicated …
In the hydration of calcium aluminum oxide-gypsum mixtures, i.e., Ca 3Al 2O 6, Ca 12Al 14O 33 and CaSO 4·2H 2O, the reaction products can be ettringite, Ca 6Al 2(SO 4) 3(OH) 12·26H 2O ...
Calcium sulfate. J L RICCI, ... H ALEXANDER, in Bioceramics and their Clinical Applications, 2008. 14.2.1 Gypsum and its derivatives. CS cements begin as gypsum, …
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O. ... Any of various mineral and industrial forms of calcium oxide differing chiefly in water content and percentage of constituents such as magnesia, silica, alumina, and iron. ... Oxide of calcium, CaO; the white or gray, caustic ...
Gypsum is an excellent source of Ca and S Various by-product material are acceptable There continues to be no support for the management of Ca:Mg Relatively large applications of gypsum can change soil properties There is some evidence that gypsum or other Ca sources can influence P loss More research is needed before a …
Skip to Article Content; Skip to Article Information; Search within. Search term. Advanced Search Citation Search. Search term. Advanced Search Citation Search. Login / Register. Meeting Abstracts. Crystallization Process of Calcium Sulfate Dihydrate in Gypsum Type Brine System. Penggao CHENG. College of Marine …
Gypsum, a naturally occurring mineral with the chemical formula CaSO4·2H2O, exhibits several important chemical properties that …
Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 220,388,875 papers from all fields of science ... {Modeling gypsum (calcium sulfate dihydrate) solubility in aqueous electrolyte solutions using extreme learning machine}, author={Mohammad Ebrahimi and Omid Deymi and Fahimeh …
Calcium sulfate exists in three forms, namely dihydrate or gypsum (CaSO4·2H2O), anhydrite (CaSO4), and hemihydrate or bassanite (CaSO4·0.5H2O) depending on temperature, pressure, pH, and formation conditions. The formation of calcium sulfates occurs widely in nature and in many engineering settings. Herein, a …