Production process of pre-molten material for continuous crystallizer protecting slag

Abstract

The pressure-molten material accounts for 60-85% of protecting slag. It is produced through the process of material crushing to 5 mm below size, mixing with loess and water in a cylinder stirrer, pressing in a briquette making machine into hollow block with certain mechanical strength, melting together with coke inside a furnace, spraying water to cool in a conveyer to form solid block and cooling naturally. The said process makes the pressure-molten material homogeneous in component, alkality, smelting point, etc. and has high yield and low cost.

Description

Technical field: [0001] The invention relates to the pre-melting raw material preparation and post-melting condensation process of protective slag for continuous steel casting, and belongs to the field of steelmaking protective material production. technical background: [0002] Many manufacturers of continuous casting mold slag for steelmaking use the pre-melting process. The basic process is as follows: each raw material is crushed to a certain size (usually 30-50mm) and weighed according to the proportion, mixed with a certain amount of coke and The ratio of materials is added to the melting furnace at regular intervals. After melting, the melt enters the water tank for water quenching, and then is sent to the drying process by the conveying equipment. The shortcomings of this process are: due to the large difference in melting point, specific gravity, melting speed and post-melting characteristics of the pre-melted raw materials, the raw materials enter the furnace in pi...

AI Technical Summary

Problems solved by technology

The shortcomings of this process are: due to the large difference in melting point, specific gravity, melting speed and post-melting characteristics of the pre-melted raw materials, the raw materials enter the furnace in pieces and melt at the same time, resulting in uneven and fluctuating melt components at different time periods. large, resulting in a large difference in the physical properties of the solid solution, which affects product quality; the melting of high melting point and low melting rate raw materials forms enrichment locally in the furnace, and sticks to the furnace wall, eventually causing bridging of the materials in the furnace and forcing the shutdown of the furnace Maintenance, affecting normal production; the melt is quenched into a solid melt, and the basic oxide Na in the melt is dissolved in water 2 O, K 2 O, CaO and acidic substances such as SiF are lost in the water quenching process, and the water content is high, so it needs to be dried for dehydration or air drying, which increases the production cost

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