Resumption of Short-term Burn Reconstruction Missions to Ukraine in Light of COVID-19: A Paradigm Shift

The COVID-19 pandemic has disrupted the lives of billions of people globally. Some medical systems continue to be overburdened due to the viral illness leading to incredible public health challenges domestically as well as abroad. However, with vaccination distribution increasing globally, many are pushing for a return to some form of normalcy. In the medical community, some are weighing the risks of returning to global health missions and considering protective strategies to minimize risk of viral spread. Here, we describe our experience in returning to an annual burn reconstruction mission in a low- and middle-income country. We have successfully carried out a return surgical mission trip. Our team of 10 individuals was able to perform over 75 procedures on 25 pediatric patients in 4 operative days. We applied a variety of protective strategies and altered mission protocol to limit exposure and transmission risk while focusing heavily on education and training. Additionally, we increased the use of telemedicine and eliminated typical in-person clinic visits. We increased operative complexity to increase impact while limiting patient exposure. Rigorous perioperative safety and follow-up protocols were implemented. The increased use of telemedicine, reduction of in-person visits, emphasis on education, and implementation of safety and follow-up protocols have led to an improvement in efficiency, safety, and accountability. Our adaptations have provided guidance on responsibly resuming surgical outreach missions, with changes that are likely to endure beyond the COVID-19 pandemic

STUDY OF GOLD ENCAPSULATION IN MAGHEMITE DURING MICROWAVE ROASTING OF FLOTATION CONCENTRATE

The article presents the results of a study of the encapsulation of gold in maghemite during microwave processing of refractory gold-bearing concentrate. The magnetic separation of the MW calcine showed the concentration of gold in the magnetic fraction. The results of XRD analysis confirmed the high content of maghemite in the magnetic fraction. An obvious correlation was found between gold and maghemite, since most of the gold recovered in the magnetic fraction where the maghemite content is 48.7%. Sulfuric acid leaching of the magnetic fraction in order to dissolve iron oxides made it possible to increase the rate of gold recovery from the magnetic fraction to 96%

MICROWAVE TREATMENT OF A REFRACTORY GOLD CONCENTRATE

The article presents the results of microwave processing of gold-containing sulfidic carbonaceous flotation concentrate, with the aim to oxidize sulfide minerals and organic carbon, in which gold is associated. The flotation concentrate was processed in a microwave oven with an output power of 700 W, so that after every 2 minutes of treatment the magnetron was turned off, the sample was mixed, then turned on. The degree of removal of sulfide sulfur was 96%. Organic carbon is removed by 76.7%. The IR spectra of the initial flotation concentrate and microwave treatment product are given, as well as the results of thermogravimetric analysis. The optimal conditions for microwave processing were determined: the power of 700 W, 2 minute processing time and 1 minute mixing time. The main advantage of the microwave processing method is the short time and the high degree of sulfide sulfur removal

STUDY OF GOLD ORE DEPOSITS OF ARISTANTAU FOR RESILIENCE AND SEARCH TECHNOLOGIES FOR ITS PROCESSING

The article presents the results of research of chemical, material, mineralogical and rational analyses of persistent gold-bearing ore of The aristantau Deposit. The re- sults of experiments indicated the content of sulfide sulfur, organic carbon, arsenic and antimony. As a result, the technological scheme included operations for oxidative firing of the flotation concentrate. Various forms of fine-grained gold were found in pyrite, arsenopyrite, and sphalerite