Method for smelting medium-low carbon ferromanganese

Abstract

The invention relates to a method for smelting medium-low carbon ferromanganese, which is characterized in that the smelting cost of the medium-low carbon ferromanganese is further reduced by setting a blast furnace-converter process, and the smelting cost of the medium-low carbon ferromanganese is further reduced by mixing and blowing carbon dioxide and oxygen in different proportions in multiple directions in the converter process. The corrosion to equipment in the converter smelting process is reduced to the minimum, meanwhile, the volatilization loss of manganese is reduced, and the quality of a final product is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of alloy smelting, and particularly relates to a method for smelting medium-low carbon ferromanganese. Background technique [0002] Electric silicon heat method, electric furnace-shake bag method and converter oxygen blowing method are the main technological processes for smelting medium-low carbon ferromanganese in the prior art. Electrosilicothermic method is to add silicomanganese alloy, manganese ore and lime in the refining electric furnace, heating and melting to use silicomanganese alloy to reduce the manganese in the manganese ore, and finally obtain a qualified product. This traditional process has the disadvantages of poor utilization of heat energy, low recovery rate of manganese and high production cost. The electric furnace-shake bale method is to add preheated manganese ore, lime and liquid manganese-silicon alloy to the shaker bag, and let the shaker bag move horizontally and circularly to m...

AI Technical Summary

Problems solved by technology

In foreign countries, the oxygen blowing method has been put into industrial application in the 1970s; and the main reason for the limitation of domestic application is that many domestic ferroalloy enterprises are in the trial production of low-carbon ferromanganese in converter smelting, according to the traditional "temperature The higher the value, the more beneficial to decarburization and the inhibition of manganese oxidation”, the smelting process adopts a high-temperature blowing system, resulting in the existing converter smelting process not only consumes a lot of refractory materials, but also has a serious volatilization loss of manganese, and the recovery rate of manganese is extremely low ( When blowing low-carbon ferromanganese with a carbon content of about 0.9wt%, the recovery rate of manganese is even less than 40%.

Chinese patent publication CN104294002A will CO 2 Introduced into the production of ferrochromium, but it did not study CO 2 The injection ratio and other details, and because it prepares ferrochrome (it adopts submerged arc furnace + converter process), its preparation method is not completely suitable for the preparation of ferromanganese

Some studies have focused on the utilization of CO 2 and O 2 The mixed gas decarburized the stainless steel melt (Fe-Cr-C system), and achieved an obvious effect of decarburization and chromium preservation, but the same did not study CO 2 The injection ratio and other details, and because it prepares ferrochromium, its preparation method is not completely suitable for the preparation of ferromanganese

Some studies have also focused on CO 2 and O 2 The process of smelting ferromanganese with mixed gas, but it is only an experimental study of CO 2 and O 2 The influence of the overall ratio of mixed gas on ferromanganese smelting has not been studied at all, such as raw material setting, basic process and other specific production processes and production details for ferromanganese, and at the same time, no research has been done on the injection details of specific locations, etc.