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eng Kinetics of roasting of copper and iron sulfides with soda in a vibratory boiling layer
Baimbetov, B. S.; Bekisheva, A. A.; Aytenov, K. D.; Abdikerim, B. E.
Metalurgija Vol. 59, No. 2, 2020
The kinetics of the roasting of iron and copper sulfides in a pulsating layer was studied, and the kinetic parameters of the processes were determined. The determination of the order of the roasting reactions and activation energy in the MeS – Na<sub>2</sub>CO<sub>3</sub> - O<sub>2</sub> system is based on the differential method. Using the dependences of the degree of conversion of copper and iron sulfides in the reactor of the vibratory pulsating layer at a pulsation frequency of 50 Hz and a pulsation amplitude of 0,1 - 0,5 mm, the values of...
Hrčak ID: 232474


eng Application of passivators in transformer insulating mineral oils
Lewand, Lance
Transformers Magazine Vol. 2, No. 2, 2015
Electrical insulating mineral oils are mainly manufactured from naphthenic crude sources, with a small number being produced from paraffinic crudes and gas-to-liquids technology. The resulting products are most frequently free of additives, except for certain types of phenol-based oxidation inhibitors, and of a very low percentage by weight, only up to 0.4 %. The main specifications for electrical insulating oils, Doble TOPS, ASTM D3487 and IEC 60296, only allow oxidation inhibitors and any other additives must be agreed upon by the entities in...
Hrčak ID: 182787