Electrocrystallization of Elemental Arsenic From Alkaline Solution Obtained From Oxidative Leaching of Arsenopyrite Ore From Tsan and Development of Limited Process Parameters

The work discusses the process of electro crystallization of elemental arsenic from an alkaline solution obtained by oxidative leaching of arsenopyrite ore in Tsana, Svanety, Lentechi region, Georgia. The parameters applicable to the process and their optimal values were determined. To obtain elemental arsenic by electrochemical method, it is necessary to select such electrolysis conditions, during which arsenic with high current solution, exceptionally low layer thickness is obtained. In reference works the cathode material is Mercury on which the dissolved arsenic is in a volatile form. The latter does not react with mercury is easy filtered, but its drawback is that on an industrial scale, the mercury cathode has no use. In addition the melting of copper, nickel and antimony ions in electrolyte degrades the arsenic released in the solution. To carry out the process on an industrial scale some ventilated metal, such as titanium, must be used as a cathode. It is cost-effective without pretreatment as well as when treated with titanium oxide or nitride. It’s also a great way to get a look. Mainly nickel, platinum or ORTA electrode is used. In the work as a result of theoretical and experimental works the main characteristic parameters of the electro crystallization process of elemental arsenic from alkaline solutions containing sodium arsenate and arsenite obtained as a result of oxidative leaching of tin arsenate were studied: current density, temperature, concentration of arsenic and sodium hydroxide in the electrolyte, effect of electrolysis process duration and cathode material on the solution of elemental arsenic current density. In the work based on the results of theoretical and experimental works optimal conditions for obtaining elemental arsenic from alkaline solutions obtained by oxidative leaching of arsenic ore in the process of electro crystallization were established. A technological scheme was also developed.