Particle size distribution, of raw material

The aim of this study was the assessment of the effect of the particle size distribution of raw material and feed moisture content on the energy required for the transformation of powder material into granulated product of de-... 

Figure 14. Particle size distribution of raw materials used in the project...

Testing of the catalyst was performed in the dual-fluidized bed reactor, where in the first reactor pyrolysis of the biomass and in the second upgrading of the pyrolysis vapours through catalytic de-oxygenation occurred. The bed material in the pyrolysis section was 40 g of quartz sand with a particle size distribution of 100 - 150 pm. The particle size of the catalyst was 250 - 355 pm. The amount of zeolite used in each experiment was 1.75 g. The biomass raw material used in the experiments was pine... 

Fine-grained dolomite flour was used in the experiments. Raw material for testing was prepared on the basis of five commercially available size fractions of this material classified as <10, <15, <60, <100 and <250 pm. The particle size distribution of each fraction was determined using a laser particle size analyser Analysette 22 and described by the statistical moments. 

A comparison of energy input necessary for unit growth of the mean agglomerate size on the stage of granulation for subsequent particle size distribution of the raw material, depending on the feed moisture content is shown... 

The pellets are then delivered in bulk by lorry, train or boat and also in large or small sacks to consumers. Pellets are burned in pellet furnaces to produce heat in small-, medium- and large-scale facilities. Since the quality of pellets may vary during production there are some parameters that can be used to evaluate this. The most important physical parameters are bulk density, pellet density, durability, which can be measured by determining the amount of fines, and particle size distribution of the raw material. Chemical parameters include pellet moisture content, calorific heat value as a determinant of energy content, element content (such as K, Mg, Ca, N, S, Cl), ash content and ash melting behaviour in order to prevent the agglomeration of the ash in the furnace. The net calorific heat value of pellets is about 19 MJ kg-1, which is less than 50% of the oil equivalent. Pellets consist... 

The properties of the clay ceramic products vary with the particle size distribution of the raw materials. 

It is important that the particle size distributions of the raw materials are controlled within the specified range as ... 

In the present state of the art the shaft cooler remains suitable only for very small units and for plants with exceptionally favourable raw material conditions which guarantee uniform particle size distribution of the clinker with only small proportions of coarse and fine particles and with a constant rate of clinker discharge. 

Particle size distributions of mixtures obtained (denoted by symbols Ml to M6), which are raw materials for the granulation process are shown in Fig. 1. 

All suspensions were analysed at the time of preparation and after 4 and 96 hours. The particle size distribution of the drug substance raw material was also measured (essentially dispersed to its primary particle size in iso-octane) for reference. 

The particle size distributions of each suspension at 0, 4 and 96 hours are displayed in figures 2, 3 and 4 respectively. The raw material data is displayed in figure 2 for reference. The results clearly show the size distributions in the presence of... 

The particle size distribution of South Afriea Coneentrate was measured using the laser diffractometer MS 2000 which is produced by Malvern Instruments. The moisture eapacity of raw material was measured in the self-made instrument in the laboratory. [5-6]The morphology of the particle surface were performed using scanning electron microscope (SEM) equipped with a tungsten filament emission source. 

Among new mill developments, annular-gap bead mills and stirred bead mills are being used. These have a high cost, but result in a steep particle-size distribution when used in multipass mode [Kolb, Ceramic Forum International, 70(5), 212-216 (1993)]. Costs for fine grinding typically exceed the cost of raw materials. Produces are used for high-performance ceramics. 

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