Showing papers in "Powder Technology in 1975"

TL;DR: Ordered mixing as discussed by the authors is a technique for mixing cohesive, interacting particulate systems that follows a "disorder to order" concept and has been termed ordered mixing, and it has been shown that ordered mixtures are frequently more homogeneous than random mixtures.

TL;DR: A classification and characterization of the more important transport phenomena in macroporous media (molecular diffusion, viscous flow, transport phenomena involving moving menisci: wetting, capillary rise, drainage, drying) is given in this paper.

TL;DR: In this article, a rechnerisch auswertbare Modell-Vorstellung entwickelt for Haftkraft-tragung is presented, in which the Steigerung der in den Partikelkontakten ubertragenen haftkrafte with zunehmender Verfestigung is investigated.

TL;DR: In this paper, a review of tensile strength of agglomerates is given, with a discussion of the most important theoretical considerations, various methods of measurement, a comparison of measuring techniques by experimental results and a brief look at deformation behavior under unidirectional loading.

TL;DR: In this paper, the tensile stress-strain curves of agglomerates with solid bridges between particles are compared and the physical nature of the bonds can be elucidated.

TL;DR: In this paper, the authors measured the flow of gas escaping from a bunker during pneumatic discharge of solid particles and found that the flow was primarily a function of the solids flow rate.

TL;DR: In this article, the Richardson-Zaki expression is used to measure the hindrance to sedimentation in a uniformly mixed suspension, and it is shown that the density of charge on the superficial particle surface is the dominant factor in determining hindrance.

TL;DR: In this paper, the authors measured the intensity and sharpness of the absorption bands of kaolinite in the presence of NaCl, KCl, RbCl and CsCl and in their absence, and i.r.

TL;DR: The attrition mill is a device for mechanically reducing solid particle size by intense agitation of a slurry of material being milled and coarse milling media as mentioned in this paper, and it has been shown to achieve specific surfaces of 40 and 25 m 2 /g, corresponding to 38 and 56 nm equivalent spherical diameter, respectively.

TL;DR: In this paper, the performance of seven continuous mixers has been assessed using 20 : 1 mixtures of sand and sugar, and the results showed that performance of a given mixer is very much a function of the flow properties of the materials to be mixed.

TL;DR: In this paper, the failure properties of slightly compressed cohesive granular materials are described and yield criteria from plasticity theory and soil mechanics are discussed with respect to their applicability to granular material in powder technology.

TL;DR: In this article, the authors report data obtained from a laboratory study of the flow of sand from a small mass-flow bunker, which has a vertical bin section of square cross-section and three alternative hopper sections, each of which could be used to direct the flow to a full width slot outlet.

TL;DR: In this article, a new method of representing particle shape is suggested, which takes into account the form and roundness features of the particles, and these features are represented in three-dimensional space utilizing triaxial contour diagrams in the horizontal planes, and the roundness in the vertical plane.

TL;DR: In this paper, the flow properties due to Jenike have been determined for several limestones powders of various particle size distributions by characterising the average particle size, the variation coefficient and the skewness.

TL;DR: In this article, the authors measured the diameter of a spherical particle by using a small optic fiber probe and showed that the relationship between the characteristic length and diameter can be determined from model calculation and is represented by an approximate equation.

TL;DR: In this paper, the growth rate of pure tungsten spheroids during liquid phase sintering of the 95% W-3.5% Ni-1.5%.

TL;DR: In this paper, the authors discussed the theoretical models, experimental data and the range of applicability along with the correlations to predict the characteristics of the bed and discussed the correlations with respect to the theoretical model and experimental data.

TL;DR: In this paper, the first three publications concerned with the broad investigation into the method of particle size analysis by the Coulter counter, which was initiated at IIT Research Institute in 1967, were published.

TL;DR: In this paper, a two-component treatment is proposed, developed, and demonstrated for extending the mechanistic approach for comminution processes to particulates that exhibit heterogeneous breakage characteristics.

TL;DR: In this paper, a method for expressing three-dimensional bodies by a Fourier series expansion is proposed, and the equivalent ellipsoid which has the same volume, surface area, and an average projected area as those of a test sample is made available simultaneously.

TL;DR: In this paper, an experimental investigation into the pneumatic discharge of sand and glass balk tini from a bunker through vertical standpipes of various lengths up to 1.50 m and with diameters ranging from about 7 up to 13 mm is described.

TL;DR: In this paper, the quaternary amine salts cetylrimethyl ammonium bromide (CTAB) and Cetylpyridinium brameride (CPB) were used to determine the flotation characteristics of the major constituents of phosphate ores.

TL;DR: In this article, a critical analysis of the use of industrial hydrocyclones and small classifying devices as real-time size analysers is presented, and an assessment is given of the performance of a commercial on-stream size analyser and sampling system.

TL;DR: In this article, a batch sedimentation curve for dilute phosphatic slimes to which small amounts of coarser particles were added to hasten settling are analysed, and the curves are markedly reverse S-shaped, without a constant settling rate period, and with pronounced asymptotic behaviour indicating compressible material.