in modern inorganic chemistry is very important classification of salt, the reaction and the properties of various elements and their compounds.There are substances that, among others occupy a special place.Such compounds, in particular, should be attributed calcium sulfate.Formula substance CaSO4.
Relatively large deposits of this compound in the earth's crust allow its use as a raw material in the preparation of different materials.The resulting substance can advantageously be used in construction, medicine and other fields.
In natural conditions found mineral deposits having a composition of CaSO4 2 H2O.Calcium sulfate is also found in the sea (about 1800 000 tonnes per cubic meter) and fresh water.
CaSO4 anhydride is a white powder density of 2.90-2.99 grams per cubic centimeter.Connection actively absorbs moisture from the air.Because of this property, and calcium sulfate used as a desiccant.
At a temperature of four hundred and fifty-degree tysyacha substance melts and decomposes.The solubility of the substance is enhanced in the presence of HCl, HNO3, NaCl, MgCl2.Calcium sulfate reacts with the sulfuric acid during sintering with carbon restored.
be in the water with MgSO4 and MgCl2, CaSO4 gives it permanent rigidity.Chemical softening liquid is possible using reagents.Reduction of hardness of the water is based on the introduction of substances enriched its anions.
Water softening is carried out also by ion exchange.This method is based on the ability of certain man-made and natural ion exchangers - macromolecular compounds - exchange radicals, their constituent, to ions present in the solution.As the ion exchangers often act aluminosilicates (Na2 [Al2Si2O8] ∙ nH2O, for example).
hydrate with the composition 2CaSO4 H2O - Alabaster (burnt plaster) - used in the manufacture of binders.These substances are a powder compound, from which, when mixed with water forms a first plastic, and subsequently solidified to a solid body mass.Production is carried out in alabaster plaster under the influence of firing temperature of one hundred and fifty to one hundred seventy degrees.This property is used in the manufacture partition panels and plates, molds objects, as well as implementing the plastering.Calcination
exposed to temperatures greater than two hundred degrees leads to the formation of soluble anhydrous calcium sulphate, at a temperature of more than five hundred degrees - insoluble form.The latter loses its ability to attach the water therefore can not be used as a binder.
Natural gypsum can be used as a starting material in the preparation of cement and sulfuric acid by the combined method.
Natural calcium sulfate can also be used as a desiccant in the analysis of organic compounds.The anhydrous compound is able to absorb moisture 6.6% of the total weight.Calcium sulfate is also used in the production of thermal insulation materials.
