Application of online composition detection of matte powder in"double-flash"copper smelting based on bypass sampling and laser-induced breakdown spectroscopy
The composition of matte powder is very important for process control and product quality in the"double-flash"copper smelting process.The methods such as inductively coupled plasma atomic emission spectrometry(ICP-AES)have the problems of insufficient real-time performance.In this study,the inde-pendently developed laser composition analysis system based on bypass sampling and laser-induced break-down spectroscopy(LIBS)technology realized the online detection of matte powder in closed bins for the first time.The detection was conducted every two hours.The detection results could be output within 3-5 min,and the detected components included Cu,S,Fe and SiO2.The application conditions of the laser com-position analysis system were optimized by studying the application parameters and the sampling points.That mean absolute deviations between online test values and laboratory test values for Cu,S,Fe and SiO2 were 0.507％,0.234％,0.188％and 0.035％,respectively,which could meet the comparison accuracy tar-gets of 1.3％,1％,1％and 0.1％.During the four-month long-term operation in two testing points,the mean absolute deviations of Cu,S,Fe and SiO2 in sampling point A and B were 0.712％,0.273％,0.486％,0.029％and 0.711％,0.566％,0.457％,0.045％,respectively.The results indicated that the laser compo-sition analysis system had good accuracy and stability,which could meet the real-time and reliability re-quirements for blister copper composition detection in production process.It was helpful for the intelligent improvement and optimization of process.
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