| In this work, the importance of aluminum, which can inhibit the formation of Fe-Zn compounds was introduced and the thermodynamic model of zinc-rich liquid boundary of Fe-Zn-Al ternary system was analyzed, a set of new formula of Fe solution curves was proposed using sub-lattic model by the present author. A program hi Matlab language for calculating aluminum content was made with the graphical user interface on the basis of thermodynamic analysis, by which the solubility curves of iron were regressed according existing experimental data. When using the program, the user was required to input three parameter, they are total Al content, total Fe content of the chemical analysis result together with the temperature measured by the thermocouple. The effective aluminum content and the category and percentage of zmc dross as well as the iron solution curves will be output on the interface.The galvanizing bath is always instable, effective aluminum changes quickly with the bath temperature fluctuation. Chemical analysis is too slow to feedback the real aluminum content hi the bath, so that the on-line aluminum sensor is of great significance to galvanizing process, hi this work, the principle, fabrication method of aluminum sensor, signal collection system were studied. The author undertook research work of the electrolyte which is a key technology in the sensor and its effect factors. The experiment showed that the signal of sensor was stable and its accuracy is up to 3%, its lifetime is up to 5 days. The sensor has been tested on Bao-steel 1550CGL continuous galvanizing line which is the first galvanizing line in our country, its result is satisfactory.Although the above two aluminum calculation and on-line determination are two mdependent methods as we know, the former is in good agreement with the latter, each of them can validate from each other. |
