Physical properties calcium sulfate

Barium is a member of the aLkaline-earth group of elements in Group 2 (IIA) of the period table. Calcium [7440-70-2], Ca, strontium [7440-24-6], Sr, and barium form a closely aUied series in which the chemical and physical properties of the elements and thek compounds vary systematically with increa sing size, the ionic and electropositive nature being greatest for barium (see Calcium AND CALCIUM ALLOYS Calcium compounds Strontium and STRONTIUM compounds). As size increases, hydration tendencies of the crystalline salts increase solubiUties of sulfates, nitrates, chlorides, etc, decrease (except duorides) solubiUties of haUdes in ethanol decrease thermal stabiUties of carbonates, nitrates, and peroxides increase and the rates of reaction of the metals with hydrogen increase. 

Table 2 Hsts the physical properties of calcium sulfate.

Calcium sulfate a-hemihydrate, 4 582 manufacture, 4 590-591 Calcium sulfate anhydrous (anhydrite), 4 582, 583t manufacture of, 4 591 physical properties of, 4 585t uses of, 4 599... 

Chemical treatment of natural waters. Both directly and indirectly, the general problem of purification and treatment of natural waters is related to the chemical and physical properties of the normal and acid salts of carbonic acid. The common impurities in natural waters consist of suspended solid organic and inorganic materials and of certain dissolved salts, particularly the acid carbonates, chlorides, and sulfates of sodium, calcium, and magnesium. The solid matter may be removed by filtration, the presence of limited quantities of sodium salts is not objectionable, and the calcium and magnesium salts are eliminated only through appropriate chemical treatment. The ions that are most... 

The conditions under which the free water is removed arc as important to proper drying as the physical and chemical properties of the sample. These two factors must be considered simultaneously when designing a drying procedure. Drying by controlling the temperature alone would not be reliable because of the effect the relative humidity (RH) has on the amount of water desorbed from the solid surface. However, drying under controlled conditions of temperature and relative humidity may be effective in free water removal only when a pure calcium sulfate is present. 

The physical properties of the three forms of calcium sulfate differ somewhat from each other, but their chemical properties are essentially the same. Anhydrous calcium sulfate and calcium hemihydrate are fine white odorless powders or crystalline solids, while the dihydrate may occur either as a powder or as white lumps. Both hydrates are... 

The degree to which FGD scrubber material is treated influences its physical properties. Basic physical properties include solids content, moisture content, specific gravity, and wet and dry density [67]. When dewatered, the calcium sulfite FGD sludges become a soft filter cake with a solids content typically in the 40-65% range. Calcium sulfate FGD sludges can be dewatered much more easily and may achieve solid contents as high as 70-75% after dewatering [67]. 

CaS04 2 H2O) in plasters to decorate their tombs. These two alkaline earths are among the most abundant elements in the Earth s crust (calcium is fifth and magnesium sixth, by mass), and they occur in a wide variety of minerals. Strontium and barium are less abundant but like magnesium and calcium, they commonly occur as sulfates and carbonates in their mineral deposits. Beryllium is fifth in abundance of the alkaline earths and is obtained primarily from the mineral beryl, 863 2(8103)6. All radium isotopes are radioactive (the longest lived isotope is Ra, with a half-life of 1600 years). Pierre and Marie Curie first isolated radium from the uranium ore pitchblende in 1898. Physical properties of the alkaline earths are given in Table 8.4. 

Pluta, M., Murariu, M., Ferreira, A.D.S. et al. (2007) Polylactide compositions. 11. Correlation between morphology and main properties of PLA/calcium sulfate composites. Journal of Polymer Science Part B Polymer Physics, 45, 2770-2780. 

Limited amounts of limestone, interground with Portland clinker and calcium sulfate, may beneficially affect some properties of the resultant cement. This effect is achieved mainly by physical action, as calcite (CaCOg)— Ihe main or sole constituent of limestone—participates only marginally in the hydration process. 

Inert i- nort [L inert-, iners unskilled, idle, fr. in- 4- art-, ars skill] (1647) adj. The term apphed to various extended pigments such as asbestine, barites, silica, calcium sulfate, mica, talc, etc. In general, they have poor hiding power but they are inert from a chemical and physical standpoint. While they contribute some desirable properties to paint, they are primarily used to lower the cost. 

This book will review the geology, mining, processing, uses, industry statistics, phase data and physical properties of these two important industrial minerals. Lithium and calcium chloride are not related, other than having a few common brine sources and uses, and are presented together merely for convenience. Neither material has a sufficiently extensive literature base to justrfy being the subject of a separate book, so the two subjects have been combined in this volume as separate chapters. The manner of presentation will be the same for both minerals. This book will be the last in a sequence of books on saline minerals by the author Natural Soda Ash, Potash, Borates, Sodium Sulfate, and now Lithium/Natural Calcium Chloride. 

Studies of the formation, chemical composition, and properties of deposits have shown that they consist of partially oxidized organic material, including more or less nitrogen, sulfur, and phosphorus. Compounds of iron, silicon, calcium, and other metals are present in small quantity, together with substantial amounts of lead oxides, sulfates, and halides from combustion of the antiknock fluid. The effects of these deposits are both physical and chemical in nature they may physically interfere with lubrication, heat transfer, gas flow, operation of valves and spark plugs chemically, they may bring about corrosion and oxidation. 

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