Calcium hydrates

Data on the solubihty of magnesium hydroxide in water are not all in agreement, but the solubihty is extremely low. The extent of Mg(OH)2 solubihty is 10 mg/L, which is about 1/100 the solubihty of Ca(OH)2. In concentrated solutions of NH Cl and NH CO, the solubihty of Mg(OH)2 is markedly increased, but in no instance does its solubihty equal that of MgCO in water heavily permeated with CO2. Dolomitic hydrates are slightly less soluble than high calcium hydrates, but much nearer the latter in value than Mg(OH)2, because the presence of MgO and Mg(OH)2 does not impede the dissolution of its Ca(OH)2 constituent. 

Hypochlorites. A common dry form of chlorine used as a bleach or water purifier is made by reaction of gaseous chlorine and high calcium hydrated lime ... 

Calcium Silicate Brick. Sand—lime brick is used ia masonry ia the same way as common clay brick. The bricks, molded from a wet mixture of sand and high calcium hydrated lime, are heated under pressure ia a steam atmosphere. Complex hydrosiUcates are formed that give the bricks high dimensional stabiUty (6). 

The bleaching powder acts as though it consisted of a compound of calcium hydrate and chlorine, and the process probably occurs in two stages. 

Synonyms Slaked lime hydrated lime calcium hydrate... 

Pointeau, I. 2000. Etude Mechanistique et Moderation de la Retention de Radionucleides par les Silicates de Calcium Hydrates (CSH) des Ciments. PhD thesis. Universite de Reims Champagne-Ardenne, France. 

Hydroxyapatite (HAp) and its isomorphous modifications are important and prospective materials in bioceramics. There are some mechanochemical smdies on HAp. In [25] HAp was prepared from calcium hydrated orthophosphates and calcium hydroxide or oxide by mechanical activation of mixtures in planetary mill. The authors... 

SYNS BELL MINE BIOCALC CALCIUM DIHYDROXIDE CALCIUM HYDRATE CALCIUM HYDROXIDE (ACGIH, OSHA) CALVIT CARBOXIDE O HYDRATED LIME KALKHYDRATE O KEMIKAL O UMBUX UME MILK LIME WATER MILK OF LIME SLAKED UME... 

Calcium hydrate and cerium sulphate behave like anhydrous sodium sulphate. 

In the case of difficult to slake lime, i.e. particularly highly calcined limes and limes with a high magnesium oxide-content, complete hydration can only be achieved under pressure. During the reaction a pressure of 2 to 8 bar is attained under which even the poorly soluble components are hydrated. The steam is separated from the dry calcium hydrate by rapid pressure release (Corson process). 

Cyanogen derivatives arc numerous and capable of great complexity. Platinous cyanide Pt(CN)3, is obtained as a yellow precipitate when mercuric cyanide is added to a solution of alkali chlorplatinite. Double cyanides of the general formula M 2Pt(CN)4 are formed by such reactions as 6 KCN + PtCL = K2Pt(CN) + 4 KC1 + (CN),. These platino-cyanides do not respond to the ordinary tests for platinum. These compounds yield beautifully colored hydrates, and the barium and calcium hydrates have optical isomeric modifications.2 Certain of these hydrates become remarkably fluorescent under excitation from ultraviolet light or radium. 

Basic oxides are such as combine with water to form basea Thus, calcium oxide, CaO, unites with water to form calcium hydrate, CaH,0. ... 

Sodium Hydrate—C auatic soda—Soda (T. S,)—Soda causti/ a (lh )— NaHO—40—ia formed (1) when H O is decomposed by Na (2) by de-eorapofting sodic carbonate by calcium hydrate Na CO, + CaH O — CO, Ca -f 2NaHO (soda by lime) (3) in the same manner as in (2), using barium hydrate in place of lime (soda by baryta). It frequently contains considerable quantities of As,... 

CALCIUM HYDRATE (1305-62-0) Contact with maleic anhydride may cause explosive decomposition. Contact with phosphorus, nitroethane, nitromethane, nitroparaffins, or nitro-propane may form explosive compounds or cause explosion. Attacks some metals and coatings. 

SYNONYMS calcium dihydroxide, calcium hydrate, caustic lime, hydrated lime, slaked... 

Specific gravity. High-calcium hydrated lime has a specific gravity of 2.24 g/cm [19.1]. The values for partially and fully hydrated dolomitic limes are about 2.7 and 2.5 g/cm, respectively [19.2]. 

Synonyms/Trade Names Calcium hydrate. Caustic lime. Hydrated lime. Slaked lime... 

Mode of Preparation. — By neutralizing hydrochloric acid with marble (calcium carbonate), adding a little solution of calcium hypochlorite and calcium hydrate to the solution, filtering, evaporating until it becomes solid, and finally drying the aalt at about 400° E. 

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