Currently, in the development of the raw materials base of the gold mining industry, there is a tendency to reduce the quality of the initial mineral raw materials due to the depletion of reserves of rich gold-bearing ores. The article discusses the technology of extraction of refractory gold-bearing concentrates based on low-temperature leaching of pyrite concentrate. A decrease in the parameters of the autoclave oxidation of sulfide minerals, such as pyrite and arsenopyrite, leads to the incomplete extraction of gold into the solution and, consequently, its losses during subsequent cyanidation. As a possible option for a more complete extraction of gold using low-temperature oxidation technology, a method of flotation separation of elemental sulfur from leaching cakes is proposed. According to the basic process flow chart, the flotation process designed for gold extraction is carried out after autoclave oxidation, but before cyanidation. A series of experiments were carried out with varying reagent conditions and the dependence of gold losses on the extraction of elemental sulfur in the flotation tailings was established. As determining factors, pH and solid content in the initial pulp were considered. The paper justifies the separation of elemental sulfur from autoclave cake to enriched sulfur concentrate. The cake flotation modes after autoclave oxidative leaching of pyrite concentrate are investigated. The distribution of elemental sulfur and gold by flotation products makes it possible to conduct the tailings cyanidation process with acceptable indicators.
As a result of full-scale surveys of parameters of open mining facilities, a set of discrete values is basically obtained. The geomechanical state of the ledges of the sides of the pit and dumps can not be fully represented without obtaining objective information about the dynamics of the deformation regime of the observed object. This information is necessary throughout the life of the quarry, in order to ensure its trouble-free operation. Thus, effective monitoring of the ledges of the sides of quarries and dumps is a necessary part of the mining safety system for the enterprise, and also allows checking the correctness of the previously adopted design solutions for setting the sides and ledges of the quarry to a stationary position. This paper presents a measurement technique that allows obtaining continuous data in real time to ensure the safety of work.
The paper considers the possibility of selecting the optimal diameter of a gas pipeline with a length of more than 1000 km and a capacity of 10 million m3 per year of natural gas using an algorithm developed in the C++ programming language in order to minimize time costs. The results of calculations for three options of pipeline diameters - 820, 1020, 1200 mm are considered to justify the proposed algorithm. The gas pipeline strength in the longitudinal direction was checked for the inadmissibility of plastic deformations and general stability using standard calculation methods laid down in the program. Temperature differences and parameters of the pumped product are taken into account.
The article indicates the importance of thorough preparation of concentrate samples before hydrometallurgical operations; the experiments on studying of the factor of the size of the material are described. The comparative analysis of particle size after conventional and fine grinding is carried out. As obligatory stage of preparation of the crushed concentrate before autoclave leaching, the decarbonization process is studied. On the basis of the conducted experiments, the optimal regime of the autoclave leaching process is revealed, which provides the oxidation degree of sulfide sulfur of the order of 99%.
The paper presents the main results of the analysis of the efficiency and suitability of satellite differential radar interferometry methods using free software products and satellite imagery for general purposes. The work used data from the Copernicus program of the European Aerospace Agency; processing was carried out for radar images of the Sentinel-1 satellite family. The result of the research is a series of recommendations on the use of the considered technology and the possibility of its implementation in enterprises, taking into account the revealed features, advantages and disadvantages.
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