Abstract
The paper shows the results of studies on the identification of noble-metal mineralization in various components of ash and slag formations: underburning, aluminosilicate microspheres, initial ash (fed to the magnetic separation of the technological section of Primorsk SDPP), magnetic and non-magnetic fractions – using analytical and mineralogical methods, electronic microscopy. An integrated approach made it possible to reliably establish significant concentrations of gold, to identify the factors of technological persistence of anthropogenic materials. All products contain free gold grains ranging in size from 50 to 230 micrometers and microscopic inclusions of 0.5-20 microns. The content of free grains of gold is from 0.4 to 1.37 mg / kg. The gold is pure or with an admixture of silver (up to 17% of the mass). Depending on the research materials, gold contains variable inclusions of magnetite, ilmenite, quartz, glass, amphiboles, pyroxenes, clay minerals, and carbonaceous formations. Gold grains have complex structure and morphology. Micronized inclusions, usually rounded, also contain an admixture of silver.
Highlights
In connection with the development of modern methods of analysis, an intensification is observed in large-scale and systemic studies of coal deposits and ash and slag formations as potential sources of noble and other metals; issues are being developed on the prospects for their extraction and the creation of technologies for integrated processing, as well as the ecology of coal mining and use [1, 2]
Noble metals are found in coals and coal ash from many coal deposits and basins of the world [3-6, etc.], Siberia [7, 8] and the Far East [9-16, etc.]
At the SDPP, coal combustion occurs at a temperature of 1,100-1,600°C
Summary
In connection with the development of modern methods of analysis, an intensification is observed in large-scale and systemic studies of coal deposits and ash and slag formations as potential sources of noble and other metals; issues are being developed on the prospects for their extraction and the creation of technologies for integrated processing, as well as the ecology of coal mining and use [1, 2]. Ash and slag wastes are considered as alternative sources of mineral raw stock In this case, there are problems associated with uneven distribution of metals in ash, with the presence of gold mainly in dispersed, microscopic and submicroscopic dimensions, close connection with carbonaceous matter and intergrowth with other minerals [17]. According to electron-microscopic studies – gold in the gravity tailings, is, mainly, of the size class 0.5-1 microns or is inside other mineral formations, which explains the reason for a loss of gold
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