Электрохимические Процессы На Межфазных Границах Вi – Bi3+ В Хлоридных Расплавах

В.Ф. Козин, Н.И. Буряк, А.В. Близнюк
2017 Zenodo  
To create rational flow diagrams for the production of high-purity bismuth and to improve the electrochemical method of refining, the information is needed about the physical-chemical properties of compounds of bismuth in lower oxidation state and the mechanisms of processes occurring at Bio – Bi3+ interfaces in salt melts is required. To this end, the kinetics and mechanism of formation of compounds of bismuth in lower oxidation states in the system Bi0 – BiCl3 – ZnCl2 – NH4Cl have been
more » ... Cl have been studied by the spectro-photometric method. It has been found that when metallic bismuth is in contact with Bi3+ ions, intermediates and [Bi5]3+ clusters are formed in the melt, which are characterized by the appearance in electronic absorption spectra of the absorption bands at 18000 cm-1 and 14000 cm-1, respectively. To estimate the kinetic parameters of Bi+ and [Bi5]3+ formations, the dependence of the intensity of absorption bands on the time of contact of Bi3+ ions with metallic bismuth was used. The rate constants of the formation of Bi+ interme-diates and of [Bi5]3+ clusters are estimated to be 3.33∙10-3 and 2.31∙10-3 s-1, respectively. The cathodic and anodic current yields of bismuth have been determined. Для создания рациональных технологических схем получения висмута высокой чистоты и совершенствования электрохимического метода рафинирования необходимы сведения о физико-химических свойствах соединений висмута низшей степени окисления и механизмах процессов, протекающих на межфазных границах Вio – Bi3+ в солевых расплавах. С этой целью спектрофотометрическим методом были изучены кинетика и механизм образования соединений висмута низших степеней окисления в системе Bio – BiCl3 – ZnCl2– NH4Cl. Установлено, что при контакте металли [...]
doi:10.5281/zenodo.1053290 fatcat:hwyylraz4ffirbht5yjqdlewji