Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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United States Gypsum Co
Original Assignee
United States Gypsum Co
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Publication date
Application filed by United States Gypsum CofiledCriticalUnited States Gypsum Co
Priority to ES424838ApriorityCriticalpatent/ES424838A3/en
Publication of ES424838A3publicationCriticalpatent/ES424838A3/en
Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals
(AREA)
Abstract
A process for the production of high purity gypsum in the form of acicular crystals between 100 and 200 microns, comprising the steps of mixing concentrated SO4H2 with a solution of CL2Ca to provide the stoichiometric amount of sulfate ions; and, prior to said addition, diluting said solution by adding hydrochloric acid thereto in a suitable amount to provide an excess of chloride ions in the mixture relative to the stoichiometric amount; and providing intimate and rapid mixing of the mixture at temperatures around 65ºC to produce during said mixing operation a gypsum filter cake with a moisture content of not more than about 40%. (Machine-translation by Google Translate, not legally binding)
ES424838A1974-04-011974-04-01A procedure for the production of high purity plaster. (Machine-translation by Google Translate, not legally binding)
ExpiredES424838A3
(en)
Process for producing 7-beta-acylamino-7-alpha-alkoxy-cepheme-4-carboxylic acid- or 6-beta-acylamino-6-alpha-alkoxy-pename-3-carboxylic acid derivatives
A procedure for the manufacture of hydrofluoric acid from concentrated sulfuric acid and fluorite (Machine-translation by Google Translate, not legally binding)