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Charakterystyka niemodyfikowanej i modyfikowanej rudy darniowej jako potencjalnego sorbentu H2S

100%

Żarczyński A. , Płacheta K. , Rylski A. , Zaborowski M. , Nowosielska M. , Szynkowska M. I.

tom T. 99, nr 10

1514--1517

Naturalną rudę darniową kawałkową rozdrobniono, oczyszczono i scharakteryzowano w zakresie zawartości metali i specyfiki tekstury powierzchni (SBET, objętość i rozmiar porów). Następnie rudę zmodyfikowano, impregnując ją wodorotlenkiem potasu i węglanem sodu (roztwory wodne 5% mas.). Oznaczono zawartość wybranych metali (ASA) i innych składników w otrzymanych sorbentach oraz zbadano teksturę ich powierzchni (adsorpcja N₂).

The natural bog Fe ore was crushed, cleaned and modified with 5% by mass KOH or Na₂CO₃. The surface morphol. (SEM-EDS), metals content as well as the sp. surface area and porosity (low-temp. N₂ adsorption/desorption) of the obtained metals were detd. and compared with the properties of natural bog Fe ore. The presence of Fe, Si, Mn, K, P, O, C, Ca and Al was found in the natural ore. The sp. surface area of the KOH and Na₂CO₃-modified ores decreased significantly compared to the starting material.

Research of damage to the rear wheel rim in a tipper-truck

84%

Kubiak P. , Wozniak M. , Zakrzewski S. , Siczek K. , Rylski A. , Mrowicki A. , Matej J. , Deda J. , Knap L.

tom Vol. 70, nr 3

art. no. e141000

Serious damage to the inner rim of the rear twin wheel in one dump truck was noted during the operation of the fleet performing transport tasks. It was a drive wheel, and its damage occurred while driving with a load exceeding the permissible value. The examination of selected fragments of the damaged rim surface was conducted visually as well as using a digital microscope with a portable head. The measurements of the Vickers hardness and microscopic observations of the material structure of the sample cut along the thickness of the rim disk were carried out. The drive torque loading of the twin wheels of the tipper-truck rear axle, under their mating with different kinds of road roughness and under various vertical loads of the wheels was calculated. An analysis of stress distributions in the rim modelled using the Finite Element Method was also conducted for several possible scenarios of wheel loading. The damage to the rim was caused by simultaneous action of several factors, such as overloading the car, poor condition of the tires, loading the drive wheel by a part of the vehicle weight and the driving torque, and hitting a wheel on a cavity in a dirt road, causing a temporary relief of one of the tires on a twin wheel.