Screening treatment method for imported lump ores for iron smelting

Abstract

The invention relates to a screening treatment method for imported lump ores for iron smelting. According to the technical scheme, the method comprises the following steps of: for the imported lump ores which are frozen in winter, mixing pellets or returned pellets and the imported lump ores according to a ratio of 1: (1-4), standing for 8 to 24 hours, and performing screening twice, wherein the primary screening aperture is 5 millimeters, and the secondary screening aperture is 20 millimeters; and for the imported lump ores which are large in water content and cannot be frozen, mixing ores returned by a blast furnace and the imported lump ores according to a ratio of 1: (1-4), standing for more than 4 hours, and performing screening, wherein the screening aperture is 10 millimeters. The screening treatment method has the advantages that the imported lump ores can be screened without being influenced by water content or viscosity, the requirement of the blast furnace on the particle size of the lump ores is reduced, and the requirement of a factory for purchasing the lump ores is reduced; and therefore, a part of imported lump ores which are low in cost and can hardly be screened can be used, and the production cost is reduced.

Description

technical field [0001] The invention relates to a method for screening imported lump ore for ironmaking, in particular to a method for screening imported lump ore with high viscosity or high water content, and belongs to the technical field of ironmaking raw material preparation in the metallurgical industry. Background technique [0002] At present, it is common knowledge in the metallurgical industry to use imported lump ore directly into the furnace for ironmaking. The granularity of lump ore used in blast furnace is required to be 10-60mm. Generally, the imported lump ore is less than 60mm, but the powder below 10mm accounts for 10-50% according to the quality of lump ore. Therefore, before using lump ore in blast furnace Must be sieved. Most of the equipment for screening lump ore in ironmaking is an ordinary vibrating screening device, and some manufacturers use a rolling screening device. The sieves are divided into mesh sieves and bar screens, mostly with an apertur...

AI Technical Summary

Problems solved by technology

[0005] 2. The winter in the north is cold, and the lump ore is affected by moisture to form frozen blocks that cannot be screened. The efficiency of manual beating is very low, and the effect of using excavators or other machinery to break frozen blocks is not good and the cost is high.

In winter, the lump ore freezes the powder and the lump ore together, and even the powder freezes into a block, which cannot be screened in the screening. After entering the blast furnace, the powder is separated by the high temperature, which has a bad impact on the furnace condition of the blast furnace, thus leading to winter in the north. The proportion of lump ore cannot be effectively increased

[0006] 3. Most of the lump ore screening equipment is used outdoors. During the rainy season, the water content in the lump ore is too large, which makes it impossible to screen

Affected the increase in the proportion of blast furnace lump ore

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