The necessity of additional extraction of alkali from nepheline sludge and increase of its activity is shown. The chemistry of interaction of alkaline phases of nepheline sludge with lime milk and carbon dioxide is given. On the basis of experimental studies, the technological mode of extraction of alkali from nepheline sludge is substantiated. The changes made in the apparatus-technological scheme necessary for the process are presented. Experimental-industrial results of application of lime treatment are given.
The chemistry of interaction of alkaline phases of nepheline slime with milk of lime is presented. On the basis of experimental studies the technological mode of alkali extraction from nepheline slimes is substantiated and the kinetic features of the process, which allow us to speak about its ion-exchange nature, are determined.
Materials on recrystallization of synthetic gibbsite are presented. A theoretical substantiation of equilibrium recrystallization based on the difference in solubility of macro- and micro-particles is given. Experimental data confirming the theoretical justification are presented.
The methodology of stage-by-stage optimization of aluminate solutions decomposition is substantiated and described. Experimental materials and their mathematical processing in the form of regression equations are presented. The choice of the optimal technological regime according to the indicators of A1 2 0 3 -ZN 2 0 yield, fractional composition and CO2 content has been carried out.
It is known that the explosive characteristics and explosive efficiency of mixed explosive compositions determine not only the chemical composition and ratio of the components, but also their physical state and the uniformity of mutual distribution (mixing). The most famous example is mixtures of ammonium nitrate and TNT: grammonite 79/21 and ammonite 6ZV, which are identical in chemical composition, but differ significantly in dispersion of the components, the critical diameter, velocity, detonation pressure, etc. Here it should be noted that in determining the homogeneity of a heterogeneous system, it is necessary to consider both the size and homogeneity of mixing of the condensed components of the composition and the size and homogeneity of distribution of possible, and sometimes necessary, gas inclusions, which is typical, for example, for bulk mixtures based on porous ammonium nitrate (AN) granules and water-bearing explosives in the form of emulsions and (or) suspensions.
