Anhydrous stemming for tapping hole of blast furnace and preparation method thereof

Abstract

The invention relates to anhydrous stemming for a tapping hole of a blast furnace. The anhydrous stemming comprises the following raw materials in percentage by weight: 10 to 30 percent of brown fused alumina of 3 to 0 mm, 10 to 20 percent of bauxite clinker smaller than 0.088 mm, 4 to 10 percent of silicon carbide smaller than 0.088 mm, 10 to 20 percent of soft clay smaller than 0.088 mm, 5 to 15 percent of coke powder of 3 to 1 mm, 10 to 20 percent of coke powder of 1 to 0 mm, 10 to 15 percent of silica of 3 to 1 mm and 10 to 20 percent of ferro-silicon nitride smaller than 0.088 mm. A preparation method for the anhydrous stemming comprises the following steps: (a) weighing the raw materials according to the proportion, pouring the raw materials into a heating type edge runner mill, performing dry-blending for 20 to 30 minutes, adding hot tar with the oil temperature of 80 DEG C, controlling the temperature of the mill to be 70 to 80 DEG C, performing wet mixing for 35 to 45 minutes, and measuring the Marshall value of pug at the temperature of 50 DEG C to be 650 to 680 KPa; and (b) entering a mud extruding machine through a disc feeding machine, extruding mud and wrapping by using a plastic film to obtain the finished product, placing the finished product mud into a hopper and ageing for 48 hours to use. According to the invention, the iron slag scouring resistance is high, the iron notch hole is smooth, the aperture change is little, the corrosion resistance is excellent, spattering during tapping is avoided, the tapping time is long, the mud beating pressure is proper, and the opening performance is excellent.

Description

Technical field: [0001] The invention belongs to anhydrous blast furnace mud and a preparation method thereof. Background technique: [0002] There are currently 6 blast furnaces in the ironworks of Inner Mongolia Baotou Iron and Steel Union Co., Ltd., with a total furnace capacity of 12380M 3 , of which 2200 M 3 The above four plants have an annual production capacity of 10 million tons of iron. In recent years, due to the improvement of the concentrate level, the application of high wind temperature, high top pressure, oxygen-enriched coal injection and other strengthening measures, the smelting intensity has become more and more High, the working conditions of blast furnace taphole mud are getting worse and worse, and the requirements for anhydrous taphole mud are getting higher and higher. In 2008, due to the technological transformation of Baotou Steel Group Corporation, the mud grinding workshop of the iron-making plant was dismantled, and all 10,000 tons of anhydrou...

AI Technical Summary

Problems solved by technology

In 2008, due to the technological transformation of Baotou Steel Group Corporation, the mud grinding workshop of the iron-making plant was dismantled, and all 10,000 tons of anhydrous gun mud per year in the iron-making plant had to be purchased from outside to ensure the production needs of the iron-making plant, which required a lot of money and greatly improved cost of production

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