Remaining slag single-slag smelting operation method in converter low-iron-consumption mode

Abstract

The invention relates to a remaining slag single-slag smelting operation method in a converter low-iron-consumption mode. The method comprises the following steps that S1, smelting raw materials are prepared; S2, after last charge of slag is subjected to slag splashing treatment, the slag is solidified, all final slag is left in a converter, and then the raw materials are added into the converter to be prepared for smelting; S3, during smelting, in the blowing starting stage, lime and magnesium balls are started to be added, the adding mass of the lime is 10-15 in a thousand of the steel tapping amount of the converter, the adding mass of the magnesium balls is 6.5-10 in a thousand of the steel tapping amount of the converter, and the lance position of an oxygen lance refers to the distance between a spray head of the oxygen lance and the liquid level of a molten pool; S4, when the slag jumps at a converter mouth, the flow of the oxygen lance is adjusted to 26000-35000 m3 / h, the oxygen lance is moved upwards to 1350-1450 mm, and lime is added in batches according to 400-600 kg / batch; and S5, slag splashing is performed, wherein after slag splashing, all slag in the converter is left in the converter for smelting of the next charge; and the operation method solves the problems of high steel material consumption and insufficient phosphorus hit rate at the blowing end point caused by converter blowing splashing after slag remaining.

Description

technical field [0001] The invention relates to the technical field of secondary copper production process equipment, in particular to a smelting operation method with single slag remaining in the low iron consumption mode of a converter. Background technique [0002] At present, in the iron and steel smelting industry, due to the high pollution caused by blast furnace production, the production of blast furnaces has been gradually restricted to varying degrees. In the case of insufficient molten iron, converters want to increase steel production, reduce the consumption of molten iron per ton, and increase the ratio of scrap steel. However, it is difficult to ensure the supply of high-quality steel scrap, which makes the quality of scrap steel in the furnace uneven. After the slag operation is carried out in the low iron consumption mode, the heat is insufficient, the temperature in the early stage of blowing is low, and the silicon-manganese oxidation reaction in the molten ...

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Problems solved by technology

[0003] The purpose of the present invention is to address the above situation, to provide a converter low iron consumption mode leaving slag single slag smelting operation method, the operation method solves the problem of high consumption of iron and steel materials caused by converter blowing splash after leaving slag and the phosphorus hit rate at the end of blowing Insufficient problem