Characteristic features of the crystallization of carbonate precipitates in alkaline solutions

The results of studies of the mechanism of action of sodium polyacrylate on the nucleation and crystal growth for carbonate salts under precipitation-simulating conditions are considered.     

Peculiarities of the formation of polyacrylamide compound-based polyelectrolyte complexes in the course of the flocculation of clay-salt dispersions

Peculiarities of the formation of polyelectrolyte complexes based on cationic and anionic copolymers of acrylamide having different macromolecule charge densities on the surfaces of kaolin particles in highly concentrated salt solution are investigated. The interactions of the copolymers with the clay particle surface and with each other are studied by electrokinetic and IR spectroscopy methods. The rheological properties of kaolin suspensions are investigated in a salt solution in the presence of the polyelectrolytes. The flocculation ability of the polyelectrolytes and their binary mixtures with respect to clay-salt dispersion is estimated. The mechanism for the formation of polyelectrolyte complexes on the surface of clay particles is discussed. It is shown that the complexation of oppositely charged polyelectrolytes on the surfaces of clay particles intensifies the flocculation of clay-salt dispersions.     

Polyacrylic acid and formulations based on it as inhibitors of deposit formation in water-recycling systems

The performance of polyacrylic acid of various molecular weights and of its formulations with sodium tripolyphosphate and Na2EDTA as inhibitors of deposit formation and as dispersants was examined.     

Quantitative estimate of contents of organic additives in potash fertilizers by the IR spectroscopy method

Qualitative and quantitative examination of organic additives applied for hydrophobization of potash fertilizers was fulfilled using the IR Fourier spectroscopy of diffusion reflection. The results obtained have formed a basis for the development of the technique of measuring weight fractions of organic components added to potash fertilizers of ??Belarus??kalii?? Joint Stock Company and for the calculation of the metrological characteristics.     

Fibrous Filler-Matrix Interaction in Oxide Composites

The interaction between a fibrous alumina filler and a hydrated zirconia matrix during the fabrication of ceramic composites is studied. The influence of the crystal structure and porosity of the filler on the properties of the ZrO₂-Al₂O₃ composite material is investigated. It is found that, as a result of addition of alumina fibers of cubic and monoclinic structures (- and -phases), the ZrO₂ hydrogel interacts with fibers and solid ZrO₂ solutions of tetragonal structure are formed. These solutions exist over the range of 600 to 1200°C and, at annealing above 1200°C, due to crystallographic transitions the of - and -phases, they break down, namely Al₂O₃ transforms into -corundum and ZrO₂ into a monoclinic modification. However, the material does not fail and a stable porous ceramic composite is formed. To manufacture a composite with improved mechanical characteristics, fibrous alumina fillers with the structure of -corundum must be used.     

Effect of binder reagents of varied nature on the strength of potassium chloride grains

Specific features of structure formation in dispersed salt systems based on potassium chloride were studied from the standpoint of a relationship between the physicochemical properties of binder reagents, granulation conditions, and grain strength.