METHOD FOR AUTOMATIC CONTROL OF TECHNOLOGICAL GRADES OF CRUSHED ORE IN FLOW Russian patent published in 2020 - IPC B03B13/06 G01N23/223 

FIELD: data processing; measurement technology.

SUBSTANCE: invention relates to methods of controlling technological grades of crushed ore in a stream and can be used in concentration of mineral ores. Method of automatic control of technological grades of crushed ore in flow, including measurement of element and general material composition of ore and computer processing of obtained data. Prior to measurement of elementary and general material composition of ore, sample preparation involves extraction of dust from ore flow formed during disintegration of material. Dust is filtered from extraneous foreign inclusions, accumulated in an aqueous medium, forming a suspension, setting the suspension density limit value, sufficient for performing the subsequent analysis by instrumental method, elemental and total composition thereof is analyzed using an X-ray fluorescent analyzer and the obtained data are transmitted to a controller, in which information on the amount of technological grades of ore of the given deposit, which differ significantly from each other with respect to beneficiation properties, is also transmitted. For each kind of ore there created are archives of data obtained during periods of time, during which supply for processing of the same process ore grade was performed. In compliance with Shewhart's statistical theory, control charts are constructed inside each archive for all monitored components, finding central lines, upper and lower control boundaries, finding, for all recovered technological grades of ore, common ranges of change of content of each of the monitored components for the entire period of data accumulation, dividing the general ranges of variation of content of each of the monitored components into subbands, within which conditions of statistical stability of measurement processes are observed and number of which corresponds to the number of recovered technological grades of ore, serial numbers are assigned to subbands in accordance with conditional serial numbers of technological grades of ore, method includes forming a table of compliance of subbands of statistical stability of measurement processes of all controlled components to selected process grades of ore and containing a composite decimal code of ore grade, each digit of which corresponds to the number of its sub-range of measurement of the monitored component. Upon completion of the mapping table, the next cycle of measurement of the monitored components is carried out, determining the belonging of the measured component values to the corresponding subbands, according to the matching table, the subband numbers are found, a process ore summary code is formed, found code is used to determine the current flow ore belonging to a specific process grade and to transmit the obtained information to the operator panel or to the automatic process control system.

EFFECT: technical result consists in improvement of representativeness and accuracy of automatic control of technological grades of crushed ore in flow.

3 cl, 7 dwg, 1 tbl