Wyniki wyszukiwania - BazTech

1

Impact of particle density on the classification efficiency of the static air classifier in Vertical Spindle Mill

Li Hong, He Yaqun, Yang Jinshan, Zhu Xiangnan, Peng Zhen, Xie Weining

Physicochemical Problems of Mineral Processing

|

2019

|

Vol. 55, iss. 2

494--503

EN

In order to investigate the impact of density on the classification behavior of particles in the static classifier of Vertical Spindle Mill, the sensitivity of overflow yield to the increase of air amount for narrowly sized pyrite, carborundum, quartz and coal samples were compared in a lab-scale classifier, respectively. Response surface methodology is used to analyze the combined effect of size and density on the classification. Wide size classification was also conducted and results show that both the yield and R90 of overflow increase with the decreasing of density, and the growth of air amount would also lead them to rise. The Whiten’s model was applied to illustrate the influence of density on the sharpness of classification, corrected cut size and fishhook effect. Results show that material with a lower density would have a higher fishhook effect parameter, classification sharpness and corrected cut size. The increase of air amount would result in a more evident fishhook effect for the high density material. Based on the Whiten’s model, a new classification efficiency model with the addition of particle density in various forms was established. This new model could describe the classification efficiency of materials with different density in the identical experiment conditions.

2

Determination of Unit Pressure Force in Material Volume in the Course of Refractory Stamping Press Moulding

Orłowicz A. W., Mróz M., Cisek Z., Tupaj M., Trytek A., Kupiec B., Korzeniowski M., Sondej K., Kozak L.

Archives of Foundry Engineering

|

2016

|

Vol. 16, iss. 2

61--68

EN

The paper presents results of assessment of the unit pressure force within the refractory material volume in the course press-moulding of stampings for refractory precast shapes. The force was evaluated with the use of physical simulation of deformation undergone by lead balls placed in the raw refractory mass subjected to pressing in a metal die. To determine the value of unit pressure force applied to the aggregate grains in the course of stamping press-moulding, physical model of deformation of a sphere induced by the uniaxial stress state was used.

3

An Assessment of Appropriateness of the Choice of Parameters for Refractory Stampings Fabrication Process

Orłowicz A. W., Mróz M., Tupaj M., Trytek A., Kupiec B., Korzeniowski M., Pająk D., Sondej K., Kozak L.

Archives of Foundry Engineering

|

2016

|

Vol. 16, iss. 2

55--60

EN

The paper presents results of an analysis of material density distribution in stampings press-moulded in metal dies from raw refractory materials based on alumina-magnesia-carbon aggregate. The stampings, fabricated on LAEIS HPF 1250 pressing machine, are blanks from which refractory precast shapes are manufactured by means of drying and firing. Samples for material density evaluation were cut out from test stampings with the use of diamond-reinforced disc. Density of the material was determined in thirteen layers of stampings denoted with letters A through M.

4

Numeryczne wspomaganie impulsowych badań dyfuzyjności cieplnej niejednorodnych preparatów tkankowych

Sypek J., Żmuda S., Panas A.

Biuletyn Wojskowej Akademii Technicznej

|

2003

|

Vol. 52, nr 10

54-71

PL

Przedstawiono przykład zastosowania numerycznych technik obliczeniowych, bazujących na metodzie elementów skończonych do analizy badań dyfuzyjności cieplnej niejednorodnych preparatów tkankowych. Dla numerycznych modeli uproszczonych 1-D, 2-D i 3-D wykonano obliczenia, w oparciu o które określono wymagania dotyczące budowy modelu numerycznego, metodykę pomiarów, wielkości błędów. Omówiono problemy wynikające ze stosowania w badaniach pakietu inżynierskiego Cosmos. Zaprezentowano budowę modelu numerycznego, będącego odwzorowaniem rzeczywistego preparatu zęba. Przedstawiono porównanie uzyskanych wyników z danymi literaturowymi.

EN

The example is presented of using the finite element numerical method for analysis of thermal diffusivity of non homogeneous tissue samples. For simplified 1-D, 2-D and 3-D models the calculations have been carried out, on the basis of which the requirements concerning the architecture of the numerical model, measurement method and the error value have been established. The problems appearing during the use of the engineering Cosmos file have been discussed. The numerical model structure reflecting the real tooth is presented. The comparison of the obtained results with the literature data are also presented.