Modeling of filtration processes of technological solutions in block underground leaching

PAO “Priargunsky Production Mining and Chemical Association” has been working on reserves of uranium deposits of the Streltsovsky ore field for more than 50 years. During this period, most of the rich ores have been worked out by traditional mining and physical technology. The share of poor and ordinary ores remains significant, but traditional technology does not provide the necessary level of profitability. Therefore, the widespread introduction of physicochemical technology: underground block (BPV) and heap leaching (KV) can be a decisive moment in the continuation of the operation of these deposits. The applied technology of underground block leaching has one significant drawback – a low rate of uranium recovery into a productive solution, which significantly reduces the effectiveness of this technology in the development of poor uranium deposits. To increase the yield of uranium into the productive solution, it is necessary to analyze the entire preparation and leaching process and establish the main reasons for the low rates of transition of uranium to a mobile state. For this purpose, it is proposed to simulate the underground leaching process by building visual models of halos spreading of solutions along shrinked ore mining mass accumulated in an underground chamber. During the simulation, it was found that the distribution of the size classes of the broken ore pieces in the chamber can be predicted at the stage of drilling and blasting operations, and when determining the line of least resistance W and the distance between the ends of the wells, take into account the diameter of the controlled crushing zone R_p. At the same time, 3 zones of granulometric compositions are formed: a re-grinding zone, an optimum zone and a non-carbarite exit zone. The flow of solutions through these zones will differ the more significantly, the higher the height of the chamber. In a zone with larger crushing, an almost steep distribution of the solution spreading front is expected. Accordingly, the smaller the fraction, the lower the front to the horizontal is. The following functions are offered to simulate filtering processes: – it is possible to control the flow of working solutions to the fan of irrigation wells in order to achieve optimal leaching parameters, i.e. to quickly control the process; – knowledge of the law of distribution of irrigation flares makes it possible to select the optimal grid of location of single sprinklers

Dependence of uranium extraction into solution during heap leaching on the petrographic composition of ores

The widespread introduction of physical and chemical geotechnologies in the production of mineral raw materials makes it possible to involve ores that are poor in the content of the useful component, which are unprofitable to work out using traditional physical and technical methods. One of these new geotechnologies is the heap leaching of rocky uranium ores. When planning the volume of output of finished products, it is necessary to have an analytical apparatus that would make it possible, using the acquired knowledge, to calculate the required volume of mineral raw material production and its varietal composition. Based on their task, studies were conducted on the qualitative and quantitative characteristics of ores that affect the indicators of extraction of useful components from them. As a result of the research, the dependence of the index of uranium extraction into a productive solution during infiltration of sulfuric acid leaching on the material composition of ores was established. Ores localized in various lithological differences of acidic, medium and basic rocks were tested: granites, felsites, trachydacites, andesites and conglomerates. The ores were classified according to the size of the piece with the allocation of fineness classes +200 mm, -200 +150 mm, -150 + 100 mm, -100+70 mm, -70+ 30 mm, -30 mm. The tests were carried out in laboratory and semi-industrial conditions. The maximum extraction was obtained for the class – 30 mm in columns. When leaching in stacks, the maximum extraction of uranium into the solution was obtained for the size class -70+30 mm. The reason for the lower extraction from the -30 mm class during leaching in semi-industrial conditions was the processes of mechanical colmatation, due to the large number of fine fractions. The criterion characterizing the material composition of ores is the content of silica (SiO2). During the tests, the dependence of the uranium extraction coefficient in the productive solution on the content of silica in the ores was established. The higher the concentration of silica, the more uranium passes into the productive solution during leaching with a stable composition of uranium mineralization. The dependence is described by a mathematical formula, which allows us to use it to calculate the extraction of uranium into a productive solution, knowing the material composition of ores

Increasing gold leaching efficiency with change of solution rheological properties

Purpose. Increasing the efficiency of gold heap leaching by changing the solution rheological properties due to its mechanical activation. Semi-industrial tests were carried out to verify the results of laboratory work. Methodology. First, semi-industrial tests were carried out without activation of the solution (basic technology), and then the solution activation was applied. The ore amount in the stockpile was 600 kg; the gold content in the ore is 1.12 g/t. At the same time, the concentration of cyanide was 400 ppm. The activation degree was from 3 to 8 minutes, the leaching time was 2, 4, 6 hours, the solution temperature varied from 13 to 30 degrees. Findings. According to the results of semi-industrial tests, the dependence of gold content, pH value, and residual concentration of the reagent on the leaching time was obtained using both proposed technology and the basic one. Comparison of the semi-industrial test results related to the basic technology and proposed one (with the solution activation) showed that the maximum gold content in the productive solution with the basic technology is 1.83 mg/l, and with the activation of the solution it is 2.10 mg/l. Hence, there is an increase in the gold content by 14.7% with the solution activation Originality. Dependence of gold content in productive solution, pH value, and residual concentration of the reagent in solution on the degree of its activation has been obtained. Practical value. The optimum degree of the treatment solution activation during gold heap leaching is determined, which is from 5 minutes to 7 minutes depending on the leaching time, which increases the gold content in the solution by 14.7%.

THE USE OF DIDACTIC RATTLES IN THE MODERN SYSTEM OF CONTINUING EDUCATION

The article defines the possibilities of determination and visualization of the use of didactic rattles in the system of continuous education, specifying the possibility of adaptive-akmepedagogical inclusion of a personality in the system of productive solution of development tasks, definition of models of formation and self-realization, socialization and self-affirmation in the hierarchy of defined and achieved results. The peculiarities of consideration of the term "didactic rattles" in the traditional (broad, narrow, local senses) and innovative (adaptive, age-appropriate, unified, personalized, health-conscious, akmepedagogical senses) perspectives of determinacy of the ideas of modern pedagogy and psychology of development, pedagogical methodology and pedagogical activity are specified. The typology and peculiarities of the quality analysis of didactic rattles in the model of development taking into account the age of students are proposed. The technologies and pedagogical conditions for improving the quality of personal development in the system of continuous education using didactic rattles are singled out.

STUDYINGTECHNOLOGIESOFPRODUCINGMETALLEADFROMCONVERTERDUSTOFCOPPERMELTFACTORYJSCAMMC

The article presents the results of the processing of converter dusts to produce metallic lead and a productive solution containing copper and zinc, which are sent for further processing.

MORAL POLITIK GERAKAN MAHASISWA DALAM PERSPEKTIF TINJAUAN FILOSOFIS HUKUM ISLAM

The dynamics of the student movement is a study that will not be interrupted and very interesting. It is a reality both from a historical perspective and in the context of reality that the dynamics of student movements have provided a phenomenon that continues as if it had no end. However the student movement has colored various political events in Indonesia. This is what sometimes does not bring a productive solution This paper aims to discuss some philosophies of Islamic teachings that can be a reference in the student movement.

Possibilities design and implementation of quality improvement of self-realization and individual cooperation in the sports and educational environment

We identify features of the design and implementation of opportunities to improve the quality of self-realization and cooperation of the individual in the sports and educational environment. The sports and educational environment is determined by the model of realization of the productive solution of the tasks of development, self-realization and cooperation of the individual through “sports”, “education”, and “science”. We define the basic concepts and models that are connected with the functioning of the sports and educational environment, i. e. definition of the concepts of “sports educational environment”, “design and implementation of opportunities for quality improvement of self-realization and individual cooperation in the sports educational envi-ronment”, “models for quality improvement of self-realization and individual cooperation in the sports educational environment”, “functions for quality improvement of self-realization and indi-vidual cooperation in the sports and educational environment”, “principles of quality improvement of self-realization and individual cooperation in the sports and educational environment”, “technology to quality improve of self-realization and cooperation of the individual in the sports and educational environment”, “pedagogical conditions for quality improvement of self-realization and cooperation of the person in the sports and educational environment”; the models, functions, principles, goals and objectives of quality improvement of self-realization and individual cooperation in the sports and educational environment. We detail the practice of theorizing the quality improvement of self-realization and individual cooperation in the sports and educational environment. We highlight the pedagogical conditions for improvement the quality of self-realization and individual cooperation in the sports and educational environment. We prove the perspectives of studying and measuring the quality of the theorization of self-realization and individual cooperation in the sports and educational environment.

Study of effectiveness of strongly basic anion exchange resins in the process of uranium extraction from the underground leaching productive solution

The process of uranium sorption is one of the important stages in the production of uranium. This stage affects uranium extraction effectiveness from productive solutions. The sorption and desorption characteristic of anion exchange resins in dynamic condition were investigated in order to study the effectiveness of resins, which were used for extraction of uranium from sulfuric acid productive solution. The sorption and desorption of uranium from the productive solution on anion exchange resins AB-17 and DOWEX 1X8 200 was carried out in laboratory conditions. The sorption characteristics were investigated. The determined sorption capacities of the resins were 1.47 and 14.4 mg/mL, respectively. The most efficient anion exchanger is DOWEX 1X8 200 that has a high sorption capacity as well as good desorption characteristics, which make it possible to obtain solutions having 23 times higher uranium concentrations than in productive solutions.

Beyond Boundaries: Envisioning Metropolitan School Desegregation in Boston, Detroit, and Philadelphia, 1963-1974

From the early 1960s onward, battles over school desegregation took on an increasingly metropolitan orientation, one all but destroyed by the Supreme Court’s 1974 decision in Milliken v. Bradley. In Boston, Detroit, and Philadelphia, segregationist urbanites, when faced with a legal challenge either created or made possible by black civil rights advocates, reversed course and trumpeted the advantages of metropolitan desegregation. These tactical metropolitanists recognized that a larger desegregation area reaching into the predominantly white suburbs would mean that white children would continue attending majority-white schools and they understood that stoking suburban opposition to desegregation could defeat integrationist legislation. Despite their segregationist motives, tactical metropolitanists offered a potentially productive solution capable of mitigating white flight, providing lasting integration, and aligning with the efforts of integrationist civil rights advocates in court. Uncovering tactical metropolitanism complicates our understandings of urban segregation and the sources of metropolitan reform. It suggests the need for a metropolitan history of civil rights that centers the importance of municipal boundaries in perpetuating inequality.