Abstract
In recent years, the quality control of sintered ore has become more and more important for stable operation of modern blast furnaces where the sinter ratio of feedstock material exceeds 50%.The quality control system of sintering plant has been developed by SMI (Sumitomo Metal Industries, Ltd.), which consists of the measurement systems of free carbon and FeO content in raw materials, the control system of particle distribution of crushed coke and the FeO content in sintered ore.It's well known that the conventional batch sampling method has such limitations for quality control of sintered ore as its poor sampling frequency and time lag before result is acquired. In the past several years, SMI has developed the sensors and control system of sintered ore with satisfactory results. Our research in those several years, the following results are attained. (1)There is close relation between indices of ROI (Reduction and Disintegration Index) and TI (Tumbler Index) of sintered products and the ratio of smaller particle size of crushed coke than 1 mm.(2)FeO content of products is controllable by regulating the coke ratio in relation to the FeD content of raw materials and products.(3)FeO content can be controlled more accurately by regulating the coke ratio in which the effect of free carbon content of raw materials is corrected.From those facts, the following measurement systems are developed. (1)Continuous FeO measurement meter for raw materials ----- The principle of FeD measurement meter consists in inductance change of detecting coil by the FeD content of raw materials.(2)Continuous FeO measurement meter for sintered products.(3)Particle distribution measurement system of crushed coke ----- This system uses an optical pattern recognition method.(4)Free carbon content measurement system of raw materials ----- This system estimates the total carbon consumption by calculating the data of flue gas volume and components.The recent operation has obtained the changing the desired value of ROI from 40% to 42% as a result of the improvement of control accuracy, so the FeD and SiD 2 content of products can be cut down more than 0.7% which bring about much cost-down of products.
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