Granular mixing

Fig. 16. Steam granulation process for production of granular mixed fertilizers from dry, pulverized feed materials (7). A granulator producing 12 t/h would...

Fig. 18. TVA-type cogranulation process with preneutralizer, as used for production of granular mixed fertilizers. Feed materials such as ammonium sulfate, ammonium nitrate, urea, superphosphates, sulfuric acid, and potash are used.

A systematic, generalized approach for the scale-up of granular mixing devices is still far from attainable. Clearly, more research is required both to test current hypotheses and to generate new approaches to the problem. 

Uses Aldicarb is a white crystalline solid. It is formulated as a granular mix (10% to 15% active ingredient) because it is extremely toxic. It is not compatible with alkaline materials and is noncorrosive to metals and plastics. The systemic... 

After 1950, a major swing to granular mixed fertilizers in U.S. 

T.P. Hignett, Manufacture of granular mixed fertilizers, in V. Sauchelli (Ed.), Chemistry and Technology of Fertilizers, Reinhold, New York, 1960, Chapter 11, pp. 269— 298. 

Shinbrot, T. Alexander, A. Muzzio, F.J. Spontaneous chaotic granular mixing. Nature 1999, 397, 67, 5-8. 

Shinbrot, T. Muzzio, F.J. Non-equilibrium patterns in granular mixing and segregation. Physics Today, March, 2000 25-30. 

Carbon refractories. Carbon blocks used in the construction of blast-furnace hearths are made from dense coke possibly mixed with anthracite. Suitable grain-size fractions (up to 5—15 mm) are mixed with tar to a plastic mass which is shaped at elevated temperature by pressing or ramming. The products are fired without air at about 1400 °C in saggers covered with fine-grained coke. The carbonized tar produces a firm bond between the grains. Granular mixes arc also used in certain applications. 

Cyclic Pore Pressure Generation, Dissipation and Densification in Granular Mixes... 

Liquefaction process of granular mixes containing non-plastic silts leading to significant shear strain amplitudes appears to cause a complete remolding of the soil structure. Post-liquefection reconsolidation and associated volume compressibility is similar to that of a virgin eonsolidated speeimen of that soil at the same stress level. Post-liquefaction compressibility is highly stress-dependent. 

Silt content does influence the compressibility of the soil. However, at the same equivalent intergranular void ratio a clean sand and granular mix containing the same host sand and silt have similar volume compressibility. At the same equivalent interfine void ratio (e ), a sandy silt has similar volume compressibility as the host silt. 

The post-liquefaction volumetric strain data for clean sand from this study falls in the range of data for clean sands available in the literature. Silt content also affects the post-liquefaction volumetric strain response. However, at the same equivalent intergranular void ratio (6, ), a clean sand and granular mix containing the same host sand and non-plastic silt have similar post-liquefaction volumetric strain response. At the same equivalent interfme void ratio a sandy silthas similar post-liquefaction volumetric strain response as the host silt. Equivalent relative density may be a useful parameter to eollectively characterize the post-liquefaction compressibility and volumetric strain response of silty sands with clean sands. 

Thevanayagam, S. (2007a). Intergrain contact density indices for granular mixes I - Framework. J. Earthquake Engineering and Engineering Vibrations, 6(2), I23-I34. doi I0.1007/sII803-007-0705-7... 

Table 10.12 gives the aggregate grading requirements for the most commonly used type of HBM, the cement-bound granular mix, as specified by CEN EN 14771-1. 

The term particle (or grain) size refers to the structural make-up of such substances as granulates, powders, dusts, granular mixes, and suspensions. Knowledge of the particle size, in conjunction with the comminution process, determines such details as grinding efficiency and ultimate product fineness. To establish particle sizes and their distribution within powdered systems, the user can have recourse to a number of different measuring processes designed to indicate, with appropriate particle definition, details of the probable equivalent diameter of a particle. 

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