Several Physical And Chemical Problems Of Electrolytic Low-titanium Aluminum Alloy

A number of physical chemistry questions remained in the industrial production of aluminum-titanium alloy by electrolysis despite massive research efforts devoted to this subject, which is already in industrial application. This thesis addresses the existing questions there of and argues in favor of the feasibility of the electrolytic production of aluminum-titanium alloy.Temperatures are recorded as laboratory experiments are conducted. This, along with studies on the mechanism of titanium reduction on different kinds of electrodes in cryolite molten salt, enables the author to understand how the titanium ion reduction, which hopefully may serve as the theoretical basis for bettering methods in the industrialized production of aluminum-titanium alloy by electrolysis.The following is a brief overview of the study:1. Recording of electrolyte temperature, primary crystal temperature and degree of superheatTemperature rise curve method is adopted instead of the conventional drop in temperature curve method to record electrolyte primary crystal temperature. The resulted data boast comparatively better reliability, easier access and less error, apart from less critical demand for equipments. This theoretically provides for test on-line of primary crystal temperature.2. How the titanium reduction on the graphite electrode in cryolite molten salt This experiment takes as its theoretical basis cyclic voltammogram method ,chronoamperometry method and chronopotentiometry method. Analyses of the resulting cyclicvoltammogram curve chronoamperometry curve and chronopotentiometry curve shows that the reaction of reduction of high valence titanium ion on the surface of graphite electrode takes place in two steps. First, Ti⁴⁺ turns into Ti²⁺; and then, Ti²⁺ turns into Ti. The reaction process rely on concentration determining and the process is reversible. In this process, all Ti⁴⁺ do not into Ti directly; instead, they turn into Ti²⁺. Some of the Ti²⁺, however, may roam with the moving of electrolyte into anode region or surface of electrolyte and were re-converted into Ti⁴⁺. The vain...