AUTIGENIC MINERAL FORMATION AS AN OBJECTIVE FACTOR OF TRANSFORMATION OF TECHNOGENIC PLACERS

The paper presents the data of analytical scanning electron microscopy and mineralogical methods for studying the morphology and chemical composition of spiral man-induced products, metal spheroids and native gold from the alluvial mining waste. In all samples, including the tungsten “spiral”, mercurous gold was found. The spheroids were diagnosed as lead ones with a fine impregnation of alumina-silicate substance, antimony and copper ones with autigenic isometric and xenomorphic mineral deposits on the surface, etc. The inclusion of carbon in many newly formed minerals confirms the leading role of this element in the process of technogenic mineral formation as a reducing agent. The identified chemical diversity of numerous ore and rock phases is explained by complex physico-chemical processes occurring in the technogenic system, in which not only the residual gold is transformed, but also new ore-mineral complexes, including gold-containing ones, arise.

Влияние науглероживания вольфрама на активацию газа при синтезе алмазных структур

In order to develop a gas-jet method of diamond structures deposition, the flow of hydrogen and methane mixture through heated tungsten coaxial cylindrical channels with a built-in tungsten spiral is studied. The main attention is paid to the study of the carburization of tungsten surfaces during gas-jet deposition and the effect of carburization on the deposition rate and the morphology of the deposited coatings. A series of experiments to study the carburization of tungsten surfaces under different conditions for feeding a mixture of hydrogen and methane is performed. The flow parameters are investigated by the direct simulation Monte Carlo method. The possible ways of delivering methane and its fragments onto the surface of the spiral are determined.