Slag collecting agent for molten iron pretreatment and preparation method thereof

Abstract

The invention discloses a slag collecting agent for molten iron pretreatment and a preparation method thereof. The slag collecting agent is composed of, by weight, 64%-72% of perlite fine powder, 6%-10% of borax, 10%-15% of kaolin clay, 1%-2% of satsuma stone fine powder, 3%-8% of acetylene carbon black and 2%-6% of coal gangue, wherein the fineness of the perlite fine powder, the fineness of the kaolin clay and the fineness of the satsuma stone fine powder are each 120 meshes, and the perlite fine powder, the kaolin clay and the satsuma stone fine powder account for 65% or above of the total weight; the fineness of the acetylene carbon black is 100 meshes, and the acetylene carbon black accounts for 70% or above of the total weight; and the fineness of the borax and the fineness of the coal gangue are each 80 meshes, and the borax and the coal gangue account for 60% of the total weight. Compared with the prior art, the slag collecting agent for molten iron pretreatment and the preparation method thereof have the following advantages that the perlite fine powder and the satsuma stone fine powder are treated in high-temperature hot steam to increase the expansion degree of the perlite fine powder and the expansion degree of the satsuma stone fine powder, so that the perlite fine powder and the satsuma stone fine powder float on the surface of molten iron in the deslagging process, and splashing is avoided so that the perlite fine powder and the satsuma stone fine powder can quickly form high-viscosity colloid on the upper layer conveniently, and the component of the molten iron is not affected; and the cooling speed of the molten iron is decreased, the using amount is small, and the molten iron losses are effectively decreased.

Description

technical field [0001] The invention relates to a slag removal material, in particular to a slag collector for molten iron pretreatment and a preparation method thereof. Background technique [0002] In the field of cast iron metallurgical manufacturing, in the process of adding materials, there will be waste parts returned to the furnace, alloy materials, etc., so slag will be generated. Among them, in the later stage of cast iron smelting, before the molten iron is released from the furnace, the fluidity of the molten iron is better, solid The composite slag particles will float upward quickly, and the temperature of the molten iron surface is low, and these composite slags will solidify rapidly. At this time, due to the minimum surface tension of the molten iron, a loose scum layer is formed on the upper layer, and the slag and molten iron are easier to separate. In order to prevent the slag from flowing into the mold cavity with the molten iron, it is necessary to remove...

AI Technical Summary

Problems solved by technology

[0002] In the field of cast iron metallurgical manufacturing, in the process of adding materials, there will be waste parts returned to the furnace, alloy materials, etc., so slag will be generated. Among them, in the later stage of cast iron smelting, before the molten iron is released from the furnace, the fluidity of the molten iron is better, solid The composite slag particles will float upward quickly, and the temperature of the molten iron surface is low, and these composite slags will solidify rapidly. At this time, due to the minimum surface tension of the molten iron, a loose scum layer is formed on the upper layer, and the slag and molten iron are easier to separate. In order to prevent the slag from flowing into the mold cavity with the molten iron, it is necessary to remove the slag before casting. At this time, the viscosity of the slag is relatively poor. At present, there are many slag collectors, but many of them are directly mixed with chemical raw materials and require a higher temperature to be baked. Dry, and in the process of slag removal, due to insufficient viscosity, the efficiency of slag accumulation is low, resulting in the cooling of molten iron, and the decline of spheroidization of molten iron after partial spheroidization