1, the slag sample mainly depends on the section color of slag, the amount of glass and ash, the fluidity of slag and the difference between upper and lower slag to judge the temperature, alkalinity and furnace temperature trend of slag (the abnormal flow rate of blast furnace gas should be excluded);
2. The same is true for iron samples, mainly to observe the solidification of molten iron in the mold, and then to see the changes of cross-sectional crystals of iron samples, mainly to see the Si and S contents of iron samples. The general trend judgment can be known only by looking at it a few times, but if the composition judgment is accurate, it usually takes a period of time to compare with the composition of the laboratory and combine with the comprehensive judgment of the blast furnace condition to gain experience.