Process for physico-chemical adaptation of chemical gypsum or phosphogypsum for use in cement formulations and other construction materials |
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| 申请号 | EP07008619.4 | 申请日 | 2007-04-27 | 公开(公告)号 | EP1876152A3 | 公开(公告)日 | 2008-10-01 |
| 申请人 | Tripoliven C.A.; Fundación Instituto de Ingeniería para Investigación y Desarrollo Tecnológico Carretera Nacional; | 发明人 | Andara Giannotti, Miriam Elena Urbanizacion Ruis Pineda; Rus Romero, Jose R.; Torres, Carlos Di Pasquale; Ascanio Lopez, Morvin Urbanizacion Valles de Chara; Oropeza, Jose; Suarez, Juan Carlos; | ||||
| 摘要 | The present invention relates to the application of a novel process for the chemical and physical adaptation of chemical gypsum or phosphogypsum coming from the production of phosphoric acid and its use as a setting retarding agent in Portland type cements or in the preparation of other materials for construction. The adaptation is based on reactions in the solid state or in the presence of small amounts of water between the phosphogypsum and the agglutinating-neutralising agents, primarily by the application of oxy- and hydroxy-compounds, without rejecting the respective carbonates, of magnesium, aluminium and mainly calcium carbonate, along with mixtures thereof and later preparation of self-hardening pellets which facilitate its transport and handling. The technological process associated with the invention notably simplifies the number and type of unitary operations, and the preparation of pellets of mixtures of phosphogypsum, along with a reduction in energy costs due to operating at low temperatures (150 °C) for short times (1-2 hours) and a reduction in the quantities of neutralising agents, and it also minimise the volume of water required in the process. |
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