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AssigneesTripoliven, C.A., Fundacion Instituto de Ingenieria para Investigacion y Desarrollo Tecnologico
InventorsMiriam Elena Andara Giannotti, Jose R. Rus Romero, Carlos Dipasquale Torres, Morvin Ascanio Lopez, Jose Oropeza, Juan Carlos Suarez
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The present invention concerns the application of a novel process for the physical and chemical conditioning of chemical gypsum or phospho gypsum, derived from the production of phosphoric acid, and its use as a retarding agent in the setting of Portland type cements or in the preparation of other construction materials. This conditioning is based on solid-state reactions or reactions in the presence of small amounts of water, between phospho gypsum and agglutinating-neutralizing agents, principally through the application of oxy and hydroxy compounds, without discounting use of the respective carbonates of magnesium, aluminum and principally calcium, in addition to mixtures of these, and the subsequent preparation of self-hardening pellets which facilitate transport and handling. The technological process associated with the invention notably simplifies the number and type of individual operations, and the preparation of pellets from mixtures of phospho gypsum, in addition to reducing energy costs by operating at low temperatures (150° C.) during short periods (1-2 hours), reducing the quantity of neutralizing agents, and also minimizing the volume of water required for the process.
A process for the physico-chemical conditioning of phospho gypsum or chemical gypsum, that neutralizes and stabilizes the harmful components contained in the aforesaid phospho gypsum, for application as a setting retardant in cements.
A process for the physico-chemical conditioning of phospho gypsum or chemical gypsum, that neutralizes and stabilizes the harmful components contained in the aforesaid phospho gypsum, for application as a construction material.
A process for the physico-chemical conditioning of phospho gypsum or chemical gypsum that substantially reduces the number of distinct operations required for conditioning the material forming the subject of this patent.
A process of physico-chemical conditioning of phospho gypsum that involves three distinct operations, namely:
A process in which the treatment temperatures for chemical gypsum are comprised between ambient temperature and forty degrees Celsius for drying, and from between sixty and one hundred fifty degrees Celsius up to a maximum of two hundred fifty [degrees] for material drying-dehydration.
A process for the conditioning, neutralization and stabilization of the harmful components in chemical gypsum, which involves addition and mixing of neutralizing-agglutinating agents, which include oxy and hydroxy compounds, without discounting use of the respective carbonates of magnesium, aluminum and principally calcium, in addition to mixtures of them, between 0.5 and 10% w/w of chemical gypsum for the solid-state reaction.
A process in which the mixing of chemical gypsum and the neutralizing, agglutinating and stabilizing agents takes place between 5 and 12 minutes, or up to 60 minutes, without prejudice to other durations as required according to the nature of the phospho gypsum. The mixture can include the addition of water at between 0.5 and 5% w/w
The obtaining of modified phospho gypsum for addition to Clinker and its application as a setting retardant for cements.
Dependencies are inferred from the claim text.