Application of Infrared Sulfur Analyzer on the study of phosphor-gypsum decomposition

In order to develop automatic test so as to improve test efficiency and reduce test time, a new test method is designed to measure the desulphurization degree during thermal decomposition of phosphor-gypsum (or phosphogypsum). In this paper, an Infrared Sulfur Analyzer is set to measure the desulphurization degree of phosphor-gypsum more quickly, more conveniently, more continuously and more accurately. The desulphurization degree curve is obtained based on the test results. Besides, the corresponding regression equation are obtained, according to the test results, which shows that the desulphurization degree increase with the rising of temperature in the range of 1250-1300°C quickly, however, this increasing is not obvious when above 1300°C. The decomposition degree of phosphor-gypsum could be judged quickly and directly according to the regression equations above mentioned.