The coagulation properties of HCCA in the system “aluminate solution - nepheline sludge” were studied, which allowed to improve the processes of thickening and washing of nepheline sludge. Solutions were developed aimed at the improvement of the coarse alumina production technology on the basis of increasing the efficiency of the carboaluminate method for separating Al (III) and Si(IV) hydroxo complexes and using the combined crystal growing modifier CaCO3 – HCCA.
The analysis of control quality of technological process of melting of copper-Nickel sulfide materials is carried out. The structure of the automatic melting control system is proposed, information and control channels are described. The algorithm of process control using fuzzy logic, which allows stabilizing the copper content in the matte within the specified limits.
Металлургия цветных металлов Известия вузов. Цветная металлургия • № 6 • 2014 ВВЕДЕНИЕ В настоящее время в ходе электролитического производства алюминия некоторые технологические параметры контролируются при помощи переносных приборов или методами рентгенофлуоресцентного анализа после отбора проб электролита из электролизера [1]. После получения результатов проботбора электролита и замера температур осуществляется корректировка дозирования глинозема и фтористых солей через системы автоматического питания глиноземом (АПГ) [2]. При этом некоторое время электролизер может находиться в разбалансированном состоянии, что неизбежно приводит к снижению выхода по току, потерям сырья и электроэнергии. Высокая химическая агрессивность криолитглиноземного расплава не позволяет организовать постоянный контроль температуры, концентрации
The article is devoted to the influence of brown coal additives on the sintering of the lime-nepheline charge in the technology of alumina production from nepheline. It is shown that carbon-containing materials added to the limestone-nepheline charge intensify sintering, and thus, contribute to a more uniform heat distribution along the furnace, improve the passage of the sintered material in the chain curtains, accelerate interaction of the charge components and increase recovery of alumina from the sintered mass. The mechanism of influence of coal during its combustion on the passage of solid-phase reactions in the charge is studied. Fossil brown coals with a high content of volatile substances and carbon graphite materials were used as coal additives.
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