Identificación y caracterización hidrológica de lagunas del noreste de la provincia de La Pampa

Fil: Dornes, Pablo F.. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Comas, Rocío N.. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Cardín, Daniel. Dirección General Catastro de La Pampa. Casa de Gobierno; ArgentinaFil: Pochetti, Roberto. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Ianni, Juan. Universidad Nacional de La Pampa. Facultad de Ciencias Exactas y Naturales; ArgentinaFil: Kruse, Eduardo Emilio. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentin

COMPLETE BENEFICIATION OF LEUCITE BY THERMAL-TREATMENT

High-temperature roasting of leucite in the presence of CaCl2 gives rise to a reaction that results in almost complete recovery of its potassium content as KCl. A solid residue consisting mainly of anorthite and silica is also obtained; this could be used as raw material for the production of hydraulic binders. The process is of economic interest because of the relatively low temperatures involved and especially the low cost of the reagents employed, since these find no other valid industrial application at present. Potassium chloride, cordierite and silica are obtained if MgCl2 is used instead of calcium chloride

Pyrolysis of automotive shredder residues: a lumped kinetic characterization

A lumped kinetic model for the pyrolysis of industrial wastes of unknown chemical composition is developed. The model is applied to the pyrolysis of automotive shredder residues (ASRs), studied by means of thermogravimetric and calorimetric analyses, in isothermal and non-isothermal conditions

Thermal behaviour of mixtures of an alunite ore with K2CO3, CaCO3 and Ca(OH)2

The thermal behaviour of alunite/K2CO3, alunite/CaCO3 and alunite/Ca(OH)(2) mixtures has been established. DTA coupled with XRD analysis has allowed appraisal of the main reactions that occur when the mixtures are roasted up to about 1000 degrees C. The main products of roasting are K2SO4, CaSO4 and other sulphur compounds and aluminates which retain the SO3 deriving from the alunite. The products are formed between 700 and 800 degrees C, The aim of the work was to assess the feasibility of a thermal process for use in the case of certain kaolin deposits whose exploitation is impossible at the present time because they are contaminated with alunite (KAl3(SO4)(2)(OH)(6)) This mineral causes great difficulty when attempting to use these kaolin ores because kilning drives off SO3 which corrodes the furnaces and is environmentally harmful. The K2SO4 and CaSO4 produced by roasting the indicated mixtures can be leached with water and dilute HCl respectively and the former can be used as fertiliser. The leaching residue, with its reduced sulphur content, can then be employed by the ceramics and building industries. (C) 1997 Elsevier Science B.V

Gas di sintesi da sansa di olive mediante gassificazione

Olive husk is a by-product of olive oil production characterized by a low commercial value and a low request. The valorization of this byproduct is essential for an economic production of olive oil. Husk gasification can represent an effective alternative respect to the traditional application if the process can assure the production of a syngas with a high percentage of CO and H2, the absence of liquid hydrocarbons and a residue without entrapped char. These results were obtained gasifying husk in a two stage reactor in which the second stage is a packed stage. The paper analyzes the effect of the second stage packaging materials on the gasification products and on the gas composition. A thermodynamic analysis of the results was also made