Research on methods to improve the accuracy of measuring the natrium cyanide concentration during the cyanization process
Abstract
This article presents the results of research aimed at improving the accuracy of measuring cyanide ion concentration during gold extraction. The work is devoted to the analysis of factors influencing the service life and stability of ion-selective electrodes (ISEs), as well as the development of scientific and technical approaches that ensure the durability and reliability of these sensors under production conditions. The main methods for controlling NaCN content in pulp and the corresponding technological solutions, such as titrimetric, spectrophotometric, chromatographic, and potentiometric, are considered, with emphasis on their advantages and limitations. Special attention is paid to potentiometric systems based on ISEs, which offer high sensitivity and continuous monitoring without interrupting the technological cycle. As part of the research project, a general schematic of the ISE, a graph of measured signals for verification using standard solutions, and a functional diagram of the automatic sodium cyanide concentration control system during cyanidation were developed. The automatic control system analyzed measurement results from direct reference electrodes with the ISE and examined issues related to compensating for measured sodium cyanide concentration values based on a temperature sensor signal. The study proposes solutions to improve electrode performance: nanocomposite and polymer membranes, automatic calibration, digital signal filtering, and the use of artificial intelligence algorithms to correct for potential deviations. It has been established that the integrated application of these measures increases the service life of electrodes by 1.5-2 times and measurement accuracy to 95-98%. The obtained results confirm the feasibility of implementing improved ISE sensors and intelligent control systems to optimize reagent consumption, reduce environmental risks, and increase the efficiency of precious metals hydrometallurgical extraction processes.