Nomination Background: Gypsum (CASRN: 1)
Gypsum is the dihydrate form of calcium sulfate. The word "gypsum," however, is used to describe different phases of the same material, including anhydrite (calcium sulfate, with no water of crystallization), selenite, calcined gypsum, and plaster of Paris. It …
09 Which Gypsum: Anhydrite or Dihydrate?
When anhydrite gypsum or dihydrate gypsum are spread in dry granular form, the different dissolving rates can actually be an advantage, if they are used intelligently. Dry ag fines get dissolved (and thus enter the soil) by repeated applications of water from rain or irrigation. The number of cycles necessary to fully dissolve the particles ...
Why Gypsum?
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. The …
Calcium Sulfate (CaSO₄)
Calcium sulfate is a versatile chemical compound composed of calcium, sulfur, and oxygen, known for its widespread use in industries such as construction, food, and medicine.Found naturally as gypsum (dihydrate) and anhydrite (anhydrous), it plays a critical role in making plaster and drywall, acting as a food additive for coagulation and stabilization, and …
Modeling gypsum (calcium sulfate dihydrate) solubility in …
In the present research, the solubility of gypsum (calcium sulfate dihydrate) in aqueous electrolyte solutions was predicted using four different intelligent modeling techniques, including Adaptive Boosting-Support Vector Regression (AdaBoost-SVR), Extreme Learning Machine (ELM), Gradient Boosting-Support Vector Regression (GB-SVR), and ...
All About Gypsum – Uses, Properties, Color, and Worth
Gypsum is a mineral comprised of calcium sulfate dihydrate. Gypsum is considered an evaporate and forms when evaporation of water allows oxygen to bond with the surrounding sulfur to create sulfate. The sulfate will then bond with surrounding calcium and water to create the final product gypsum.
Preparation of Whitening Dihydrate Gypsum and Short …
Using FGD gypsum as the raw material, whitening and large prismatic dihydrate gypsum can be obtained by dissolution-crystallization and decoloring process with α-hemihydrate gypsum whiskers prepared in MgSO 4-CaCl 2-H 2 O solution, which can transform into whitening short columnar α-hemihydrate gypsum. The effects of aging temperature, pH, dosage of …
Gypsum – Calcium Sulfate
Because the quarries of the Montmartre district of Paris have long furnished burnt gypsum (calcined gypsum) used for various purposes, this dehydrated gypsum became known as Plaster of Paris. Upon adding water, after a few tens of minutes, plaster of Paris becomes regular gypsum (dihydrate) again, causing the material to harden or "set" in ways that are useful for casting …
From atom level to macroscopic scale: Structural mechanism of gypsum
Gypsum plaster is an inorganic binder that is prepared in a two-step process. The first step is dehydration: heated to 100–200 °C, gypsum (CaSO 4 ·2H 2 O) releases water as vapor [1, 2] and, depending on temperature and water vapor partial pressure (p H2O) [3, 4] forms either hemihydrate (CaSO 4 •½H 2 O) or γ-anhydrite (CaSO 4), the main components of the …
The Role of Gypsum in Agriculture: 5 Key Benefits You …
While farmers have used gypsum (calcium sulfate dihydrate) for centuries, it has received renewed attention in recent years. This resurgence is due in large part to ongoing research and practical insights from leading experts that highlight the many benefits of gypsum. 1 of 5. Start Slideshow. Start Slideshow ...
Preparation of Medium–Low Strength Hemihydrate Gypsum …
In the dehydrated phase, gypsum dihydrate in PG can be transformed into α-HH in a saturated water vapor medium or aqueous solution . This approach not only enables the high-value utilization of PG but also addresses the scarcity of natural, high-quality gypsum resources, contributing to ecological preservation and reducing land resource waste. ...
Gypsum
Gypsum is composed of hydrated calcium sulfate, and its chemical formula is CaSO4.2H2O. It is a natural salt mineral, that is to say, an evaporite mineral, and is mostly found along with …
Physicomechanical Properties of Gypsum with Mineral …
It can be seen from Figure 8 that gypsum dihydrate was the mineral in the hydrated gypsum matrix without thermal treatment (25 °C). After the thermal treatment at 200 °C, the gypsum dihydrate lost one and a half moles of water and transformed into gypsum hemihydrate (with half a mole of water left).
Gypsum in construction: origin and properties
Calcium sulfate, commonly known as natural gypsum, is found in nature in different forms, mainly as the dihydrate (CaSO4 · 2H2O) and anhydrite (CaSO4). They are products of partial or total evaporation of inland seas and lakes. Both the dihydrate and the anhydrite occur in nature in a variety of forms. The origin of gypsum, its genesis, varieties and properties are discussed, and …
Gypsum | Properties, Formation, Uses and Deposits
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 mineral, meaning it contain…
Dehydration Pathways of Gypsum and the …
The dehydration products of gypsum under different temperature and water vapor pressure were investigated by thermodynamic theory. Additionally, the rehydration mechanism of soluble anhydrite was also studied …
Dihydrate vs. Anhydrite
The highest quality gypsum for agriculture is natural, a dihydrate, has beneficial trace minerals, and purity levels over 80%. Because Dihydrate is already hydrated with water molecules, as opposed to anhydrite, it dissolves faster in …
Gypsum: mineral characteristics, properties, uses
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate (CaSO4·2H2O). It is renowned for its wide use in the manufacturing of plaster, drywall, and fertilizers.
MATERIAL SAFETY DATA SHEET Gypsum (Calcium …
Gypsum (Calcium Sulfate Dihydrate) This product can release nuisance dust in handling or during use. Eye, skin, nose, throat, and upper respiratory irritation can occur with dust exposure. EFFECTS OF OVEREXPOSURE: ACUTE: EYES: Direct contact can cause mechanical irritation of eyes. If burning, redness, itching, pain or other
Experimental Data on Solubility of the Two Calcium Sulfates Gypsum …
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 dataset containing the experimental solubility data …
Gypsum Granules
Gypsum Calcium Sulfate Dihydrate Application Rates For Vegetable Gardens & Flower Beds: To prepare new gardens, apply 1-1.5 lbs per 100 square feet by evenly distributing over soil surface by hand or spreader. Incorporate into the top 2-4 inches before seeding/sodding.
Gypsum
The word gypsum is derived from the Greek word γύψος (gypsos), "plaster". [9] Because the quarries of the Montmartre district of Paris have long furnished burnt gypsum (calcined gypsum) used for various purposes, this dehydrated gypsum became known as plaster of Paris.Upon adding water, after a few dozen minutes, plaster of Paris becomes regular gypsum (dihydrate) …
Formation of α-Hemihydrate Inside of a Gypsum Crystal …
Gypsum (calcium sulfate dihydrate) is one of the most used inorganic binding materials in the world. During calcination, calcium sulfate subhydrates are formed and, for technical reasons, are ...
What is Gypsum – Eurogypsum
Gypsum is composed of calcium sulphate (CaSO4) and water (H2O). Its chemical name is calcium sulphate dihydrate (CaSO4.2H2O). Gypsum can be milled mixed with water and then resume its original rock-like state. This means it can be …
Gypsum: Properties, Uses, Formation, Types – …
Gypsum is a very common, soft sulfate mineral composed primarily of calcium sulfate dihydrate, with the chemical formula CaSO₄·2H₂O. Visually, it can be colorless or white, but impurities can also give it a variety of hues.
How to Use Gypsum in Gardening
Gypsum can be helpful for breaking down hard-packed clay soils and reducing sodium levels in coastal gardens, but it isn't an essential addition. ... Made up of calcium sulfate dihydrate, gypsum is a non-toxic mineral that's naturally occurring and contains high levels of calcium and sulfur.
The kinetics of the precipitation of gypsum, CaSO4·2H2O
Of the precipitates, calcium sulfate – crystallizing mainly in the form of gypsum, calcium sulfate dihydrate (CaSO 4 ·2H 2 O) – is one of the most common representatives, which is present (or may form) in a large variety of natural and industrial processes, such as acidic wastewater treatment, phosphonic acid production, wet flue gas ...
Infrastructure and Construction Materials Guide — Gypsum
Gypsum (CaSO 4 •2H 2 O), calcium sulfate dihydrate, has the unique property of releasing 1.5 molecules of water when heated to about 320-350 o F. The resulting chemical compound, calcium sulfate hemihydrate (CaSO 4 •½H 2 O) will, in turn, react with water to reform gypsum.
Organic Gypsum Powder
OMRI Listed - Cz Gypsum Calcium Sulfate Dihydrate is an All-Natural mineral fertilizer listed by the Organic Materials Review Institute (OMRI). It may be used in certified organic production or food processing and handling according to the USDA National Organic Program regulations.
(PDF) Dehydration Pathways of Gypsum and the …
The dehydration products of gypsum under different temperature and water vapor pressure were investigated by thermodynamic theory. Additionally, the rehydration mechanism of soluble anhydrite was ...