摘要:
Die vorliegende Erfindung betrifft ein Verfahren zur Trockenentschwefelung von Rauchgasen aus Zementdrehrohröfen, bei dem zur SO 2 -Bindung geeignete Additive, wie Branntkalk und/oder trockenes Kalkhydrat dem Ofen zugeführt werden, wobei das Additiv in eine rauchgasführende Zone am Ofenkopf, unter einem Einblaswinkel von 2-12° schräg zur Ofenachse und bei einer Einblasgeschwindigkeit von 20-80 m/s eingebracht wird.
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.
摘要:
The invention relates to a method for manufacturing cement clinker whereby the raw meal is initially subjected to preparatory processing, e.g. by comminution, homogenization and/or drying, and, eventually, nodulized and burned, with the nodulization process itself taking place in a stationary burning reactor. By the method according to the invention a sulphatic compound is added to the raw meal in a sufficient quantity before introducing the raw meal into the stationary burning reactor or directly into the stationary reactor, e.g. through the combustion air or together with the fuel. It is an essential requirement that the sulphate content of the calcined raw meal is considerably higher than the alkali oxide content.
摘要:
The invention relates to a process for the production of binders by calcinating mineral raw material mixtures. In order to improve the process and the quality of the binders, it is proposed that oil shale and/or oil sand fills are converted by targeted agglomeration into particles of a certain size and consistency, wherein the water content for the mechanical stabilization of the agglomerate is adjusted to less than 25 percent and the agglomerates are calcinated to form binders at temperatures between 800 and 1500 °C under reductive conditions over the entire process with a Lambda value
摘要:
Ein Eisen- oder Tonerdezement enthält eine CaO-Komponente, eine Aluminiumoxidkomponente, eine Eisenoxidkomponente und eine Manganoxidkomponente, wobei Mangan in einer Menge von 5 bis 50 Gew.%, berechnet als MnO und bezogen auf das Gewicht des Brennprodukts, vorliegt und das Molverhältnis der CaO-Komponente zu der Summe der übrigen Metalloxide 0,9 bis 2,5 : 1 beträgt; dieser weist mit üblichen Tonerdezementen vergleichbare Abbindegeschwindigkeiten und Festigkeitsentwicklungen auf, wobei zu dessen Herstellung günstigere Ausgangsstoffe einsetzbar sind und eine geringere Brenntemperatur erforderlich ist als bei üblichen Tonerdezementen.
摘要:
In a method for producing photocatalytically active clinker, materials containing TiO 2 are reacted with raw ground clinker or raw mixture to form calcium titanates, in particular CaTiO 3 .