Patent RU-2758305-C1 (RU)
Title: Method for automatic control of technological grades of ore in flow
Inventor: Zimina Anna Alekseevna
IPC: B03B13/00
Filed: 2021-03-30
Granted: 2021-10-28
Abstract: FIELD: mineral processing; metallurgy and other industries. 
     SUBSTANCE: invention relates to methods for controlling technological grades of ore in a stream and can be used in the field of mineral processing, metallurgy and other industries. The method for automatic control of technological grades of ore in the flow consists in the fact that the final technological indicators of the efficiency of the flotation process are set, a representative sample of the flotation feed pulp is taken, one part of the sample is analyzed for the content of chemical elements in the solid phase of the pulp, and the other is subjected to dehydration, drying and analysis. the color characteristics of the formed dry surface, control the operating parameters of the grinding and flotation cycles and the corresponding technological indicators of the efficiency of the flotation process, then an archive of initial data is formed, containing information on the numerical values of the color characteristics and the elemental composition of the flotation feed, the values of the controlled technological parameters and indicators of the efficiency of the flotation process at each measurement cycle. After the accumulation of the necessary initial volume of information for the period of submission for processing of the main technological grades of ores, its numerical coding is carried out by scalar transformation, a summary code of the characteristics of the flotation feed, which is one sequence of decimal digits, is formed from the codes of the numerical values of color characteristics and elemental composition, an archive of scalar values is formed , whose database structure is similar to the structure of the original data archive. The range of changes in the efficiency indicators of the flotation process is determined, it is divided into equal discrete intervals that are significant for assessing the performance of the changes in efficiency indicators caused by the change in the washability properties of the ore supplied for processing, the number of obtained discrete intervals is determined, serial numbers are assigned to the discrete intervals, starting from the minimum value of the range of changes performance indicators, a table is formed of correspondence to the selected intervals of the efficiency indicators of the arrays, including the groups of summary codes of the flotation feed characteristics and the codes of the values of the controlled technological parameters formed from the data obtained at the same measurement cycles, the average values of the summary codes of the flotation feed characteristics and the codes of the controlled technological parameters are found. In accordance with statistical methods, the "Shewhart control charts" take the obtained average values of the summary codes of the flotation feed characteristics and the codes of the values of the controlled technological parameters for the central lines, find for them the upper and lower boundaries of statistical stability, spaced from the average values by ± two standard deviations, the group of summary codes of the flotation feed characteristics and the codes of the values of the controlled technological parameters that go beyond the boundaries of statistical stability are excluded in the correspondence table from the data arrays. Upon completion of the formation of the correspondence table, the next cycle of measuring the parameters characterizing the properties of the ore and the current technological mode is carried out, they are subjected to processing and coding according to the above-described procedure, the criterion for the identity of the current ore grade to the technological grades contained in the correspondence table is calculated by finding the sum of the absolute values of the differences, obtained as a result of bitwise subtraction of the corresponding summary codes, and by its minimum value, the belonging of the current variety to one of those available in the correspondence table is determined when the condition of finding the code of the current variety within the bounds of statistical stability is met, and otherwise proceed to the next measurement cycle. 
     EFFECT: increasing accuracy and reliability of assessing the belonging of the current ore grade to the corresponding technological grade, as well as increasing the efficiency of the concentration production in the conditions of processing ores varying in composition. 
     4 cl, 3 dwg, 4 tbl