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US 10,858,261 B2Granted
Method for obtaining calcium aluminates from non-saline aluminum slags
AssigneesArzyz, S.A. De C.V., Consejo Superior De Investigaciones Cientificas (Csic)
InventorsFelix Antonio Lopez Gomez, Francisco Jose Alguacil Priego, Jose Ramon Gonzalez Gracia, Mario Sergio Ramirez Zablah
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Abstract
The present invention relates to a method for obtaining calcium aluminates for metallurgical use from non-saline aluminum slags by means of reactive grinding and thermal treatment.
Claims6
A method for obtaining a mixture of the following calcium aluminates suitable for the manufacturing of steel:
- CaAl2O4(CA), CaAl4O7(CA2), Ca12Al14O33 (C12A7), Ca3AlO6 (C3A) and CaAl12O19 (CA6), where C═CaO and A=Al2O3, from a non-saline aluminum slag comprising the following steps:
- a) carrying out a reactive grinding of the non-saline aluminum slag from recovery by melting aluminum scrap metal or products of secondary melting of aluminum in the presence of calcium carbonate CaCO3, wherein the non-saline aluminum slag is generated from scrap metal and the reactive grinding of the non-saline aluminum slag with CaCO3 is carried out at a molar ratio of 1:3 Al2O3:CaO;
- b) thermally treating the product obtained in step a) at a temperature between 700° C. and 750° C. for one hour;
- and
- c) thermally treating the product obtained in step b) at a temperature between 1300° C. and 1400° C.
2 more elements
Dependencies are inferred from the claim text.