An experimental study on gold precipitation from leach solutions of technogenic gold-bearing raw materials

This paper presents the results of the study dedicated to the determination of the optimum parameters for the electrolytic gold precipitation from thiourea leach solutions. The leaching was carried out using technogenic gold-bearing raw materials (gold-bearing sands) of the Far East of the Russian Federation. The study focused on the influence of the below parameters of electrolytic precipitation: electrolyte composition, overall cathodic current density, electrode voltage, and structural design of an electrolytic cell. As the results of the experiments, the optimum electrolyte composition and parameters of the current (overall cathodic current density 1000 А/m2, electrode voltage 6 V) were determined. Under these parameters, it is possible to recover up to 93 % of gold from thiourea leach solutions.Keywords: technogenic gold-bearing raw materials, gold, thiourea leaching, electrolyte, cathodic current density, electrolytic cel

Fiber-optic device for mode division

В данной работе описано простое устройство для деления мод на основе волоконно-оптических разветвителей из плавленого кварцевого волокна. Рассмотрена эквивалентная схема фотонного фонаря для такого устройства. Представлены экспериментальные данные испытаний образцов устройства. Как показали испытания образцов, эта технология позволяет получить удовлетворительные параметры для простых и недорогих устройств с одним многомодовым портом и 2-5 одномодовыми портами. In this paper, we describe a simple device for mode division based on fused quartz fiber-optic coupler. An equivalent circuit of a photon lantern for such a device is considered. The experimental test data of the device samples are presented. As test samples showed, this technology allows to obtain satisfactory parameters for simple and inexpensive devices with one multimode port and 2-5 single-mode ports.Исследование выполнено при финансовой поддержке РФФИ в рамках научного проекта No 16-37-60015 мол_а_дк