The results of synthesis hydrocarboalyuminates of calcium (GKAK) using carbonate reagents of different nature and size distribution. A high activity of the lime sludge from causticising soda and food processing conversion of phosphogypsum, which allows us to recommend them for use in the process of obtaining GKAK. Installed limiting stage of interaction of internal diffusion of the reactants.
The materials physical and chemical analysis of the reasons of instability particle size distribution of productional of aluminum hydroxide in the processing of bauxite by Bayer process. Shown that the frequency of changes in the properties precipitate Al(OH)3, formed during the precipitation of aluminate solutions determined by the dependence of the growth processes on the relative supersaturation of the system per unit area of the seed. Found determines the influence of concentration injected seed aluminum hydroxide and its active surface (which varies under the influence of impurities in the aluminate solution) on the parameters of the periodic changes in the properties of sediment.
A capability of control of melting alumina composition by means of a value of phase volt-age dc component is shown.
In the case of phosphoric furnace the influence of changes in voltage and current to the power distribution in ore-smelting furnaces between the arc shunt resistance and melt are considers.
The materials of the pilot study, which establishes the dependence of the kinetics of mass crystallization of aluminum hydroxide on the extent of metastable alkaline aluminate solutions. Shown that changes in the level of metastability of the environment of crystallization is the lag in time from changes in state parameters of physico-chemical system. The theoretical a justification of the transition from one level of the metastable state to another due to time constraints, changing the structure of unstable solutions.
The features of electric melting in ore-smelting furnace are considered, and the correlation of electrical and technological parameters and their influence on the character of the processes in ore-smelting furnace. The method to determine the current values of electrotechnological characteristics based on the harmonic analysis of electrodes current. The structure and algorithm of control system for ore-smelting furnace is demonstrated.
На примере фосфорных и карбидных печей рассмотрен характер изменения и природа существования постоянной составляющей U п.с в фазном напряжении рудно-термической печи с закрытым колошником. Величина и направление U п.с зависят от соотношения процессов химического взаимодействия электрода с компонентами реакционной зоны и степени развития и условия горения электрической дуги.