Development Of New Type Waterless Tap Hole Clay And Plasticity Detection Device For No.5 Blast Furnace In Chongqing Iron And Steel Co.

Based on analyzing the development situation of waterless tap hole clay for No.5 blast furnace in CISCO (Chongqing Iron & Steel Co.) and other blast furnaces at home and abroad, aiming at the influence factors both in and out of blast furnace on tap hole during the producing process of blast furnace, the new type waterless tap hole clay was developed after gradually experimental researches and continuous optimization of raw materials of clay.The quality of waterless tap hole clay was implemented by improving quality of raw materials, decreasing coke powder granularity, and prolonging time of grinding clay. And the waterless tap hole clay were of high intensity and large density, and had high capacity of resisting slag,hot metal etching and flushing. After tracking and further using in production, the percent of pass both of tap hole depth and quantity difference of hot metal improved to increase greatly, and the bomb due to the humidity of tap hole was radically avoided. The safety and the working environment was improved. All these established the foundation of increasing in number of tapping and strengthening smelting, and created conditions for stable operation of blast furnace. The experiment result showed that the channel of No.5 blast furnace kept stable after improving the tap hole working condition, and the slag and hot metal splashing was decreased when tapping. All these were beneficial to reduce iron loss, and could bring better economy benefit.Plasticity detection device was developed based on the working principle and performance requirement of tap hole gun. Through testing the plasticity index of waterless tap hole clay, the internally standard was made based on the testing data. And the new type waterless tap hole clay according to the standard satisfied the need of strengthening smelting of blast furnace.