Converter steelmaking technology for directly reducing-alloying manganese ore

Abstract

The invention relates to a converter steelmaking technology for directly reducing-alloying manganese ore and aims at solving the problems such as high cost of an alloying way taking manganese-series alloy as material, as well as high energy consumption and serious pollution in the production process of manganese-series alloy, and the like in the existing steel making technology. The technical scheme is based on a double-slag steelmaking process; and by the technology adjustment methods of reducing the quantity of added steel slag, adopting high lance-position soft blow operation, feeding manganese ore after turning down the converter, reducing the quantity of the secondary added slag and the like, the yield of manganese in the direct reduction process of manganese ore during the smelting with the conventional converter is greatly improved, the manganese-alloying effect is achieved, the manganese-alloying cost is reduced, and the ferromanganese making link with high energy consumption and serious pollution is curtailed.

Description

technical field [0001] The invention relates to the metallurgical industry, in particular to a converter steelmaking process for directly reducing and alloying manganese ore. Background technique [0002] Manganese is one of the most important alloying elements in iron and steel materials. It plays an important role in improving the quality and performance of steel. Most steel types require manganese alloying during smelting or refining. At present, the main alloying method at home and abroad is to add manganese alloy or metal manganese to the molten steel to increase manganese, but the process of manufacturing manganese alloy is a high energy consumption (power consumption 3000-8000KWh / ton), high The process of pollution, the cost of this process will eventually be passed on to the user through the steel production enterprise. [0003] In recent years, some new manganese alloying methods have appeared abroad, that is, adding manganese ore in the converter smelting process,...

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Problems solved by technology

[0004] According to the principle of thermodynamics, it is possible to realize the direct reduction alloying of manganese ore under the conventional smelting conditions of the converter, but the traditional converter smelting slag is too large, the slag is too oxidizing, and the carbon content at the end point is too low and other factors will reduce the manganese yield. Generally, the yield of manganese in converter smelting is lower than 30%; correspondingly, if the amount of slag is too small and the oxidizing property of slag is too weak, it will affect the dephosphorization effect, and the carbon content of the end point is controlled by the smelting end point of different steel types. Corresponding to the requirements, cannot be adjusted in a large range

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