1.0 Introduction
Blender as a size reduction machine is mostly used in both home for domestic purposes and in the chemical industry. In chemical industry, size reduction or communication is usually carried out in order to increase the surface because, in most reactions involving solid particles, the rate is directly proportional to the area of contact with a second phase. Thus the rate of combustion of solid particles is proportional to the area presented to the gas, though a number of secondary factors may also be involved; for example, the free flow of gas may be impeded because of the higher resistance to flow of a bed of small particles.
Again in leaching, not only is the rate of extraction increased by virture of the increased area of contact between the solvent and the solid, but the distance the solvent has to penetrate into the particles in order to gain access to the more remote pockets of solute is also reduced. This factor is also important in the drying of porous solids, where reduction is size causes both an increase in area and a reduction ion the distance the moisture must travel within the particles in order to reach the surface; in this case the capillary forces acting on the moisture are also affected.
There are a number of other reasons for carrying out size reduction. Thus, it may be necessary to break a material into very small particles in order to separate two constituents, especially where one is dispersed in small isolated pockets. Further, the properties of a material may be considerably influenced by the particle size; for example, the chemical reactivity of fine particles is greater than that of coarse particles, and the colour and covering power of a pigment is considerably affected by the size of the particles. Again, far more intimate mixing of solids can be achieved if the particle size is small.
Also, blender is very much important because domestically it aids both the grinding and blending of the material at the same time. It is a very fast process which have substituted the use of manually operated grinding machine due to its high speed, easy to operate/handle, portable etc.
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