Raw materials particle size

Safe operation of ferromanganese furnaces requires careful control of raw material particle size, oxygen content of the ore blend, and charge stoichiometry (38). 

The effect of increasing the temperature of an extraction is, fust, to increase the rate at which the soluble plant materials diffuse into the solvent, consequently shortening the extraction time. This is desirable from the manufacturer s point of view. Conversely, the colder the process, the slower the diffusion rate and the longer the extraction takes, giving rise to the possibility of a weaker extract due to incomplete extraction within a specified time. It follows that the more consistency is achieved in controlling the extraction temperature, the less variation there will be between different batches of an extract (given consistent raw material, particle size and extraction time). 

Note Density of finished product is dependent on powdered raw materials particle size and density). 

Russin T, Arcand Y, Boye JI 2007. Raw Material Particle Size Effect on Yield and Purity of Soy Protein Isolates. J Food Process Preserv 31 308-319. 

Raw ] Ia.teria.ls. Most of the raw materials are oxides (PbO, Ti02, Zr02) or carbonates (BaCO, SrCO, CaCO ). The levels of certain impurities and particle size are specified by the chemical suppHer. However, particle size and degree of aggregation are more difficult to specify. Because reactivity depends on particle size and the perfection of the crystals comprising the particles, the more detailed the specification, the more expensive the material. Thus raw materials are usually selected to meet appHcation-dependent requirements. 

Mixing. The most widely used mixing method is wet ball milling, which is a slow process, but it can be left unattended for the whole procedure. A ball mill is a barrel that rotates on its axis and is partially filled with a grinding medium (usually of ceramic material) in the form of spheres, cylinders, or rods. It mixes the raw oxides, eliminates aggregates, and can reduce the particle size. 

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