After the grinding and sieving operations, mixing follows, the purpose of which is to obtain a homogeneous mixture of powders. Mixing is usually carried out in parallel with grinding. This leads to the alignment of particle sizes and obtaining a more homogeneous mass. If a component is included in the mixture in a small amount, then additional grinding of its particles is necessary to increase the uniformity of distribution. At the same time, the lower the concentration of it in the mixture, the smaller the particles of this ingredient should be. If a small amount of a poisonous or potent ingredient is added to a large number of substances, then first the latter substance must be thoroughly mixed with one of the ingredients or an...