The Control Of Impurity Content In Manganese Iron Alloy

Publish Time: 06/24 2021 Author: Site Editor Visit: 11108

Out-of-furnace refining is an important part of the modern steel production process. The quality of steel depends largely on the out-of-furnace refining process.

The addition of ferroalloy will play a role in deoxidizing and alloying molten steel. Among them, the manganese ferroalloy is the ferroalloy with the largest output, the largest amount and the most versatile.

variety of steel puts forward low phosphorus, low sulfur, low titanium, low aluminum, low nitrogen, low oxygen, low hydrogen and other requirements for manganese iron alloys. The quality of current manganese-based ferroalloys cannot meet the requirements of varieties of steel. The main quality problems that exist are: high content of Ti, Al, P, O, N, and H in ferromanganese alloys; P in medium and low-carbon ferromanganese alloys , S, O, N, H content is high. The control of the content of various impurities in manganese iron alloys should be strengthened, mainly:

1.Gas Content

Since nitrogen reacts quickly with manganese at 800-1000°C, and nitrogen is also increased during the cooling process, increasing the cooling rate is beneficial to reducing nitrogen. Control the H2O content (adsorbed water and crystal water) of the charge and reduce the volatile content of coke, reduce the contact between the alloy and hydrogen in the furnace, and reduce the hydrogen content in the manganese iron alloy. At the same time, avoid contact with moist air in the process of crushing, transportation and storage to prevent hydrogen absorption reaction of the alloy.

2.Carbon, Sulfur And Oxygen Content

The feasible ways to reduce the carbon content in the manganese-silicon ferroalloy are: sedation and carbon reduction; increase the silicon content of the manganese-silicon alloy; synthetic slag refining to reduce carbon.The sulphur content in the manganese iron alloy can be reduced by making alkaline slag and slag washing and refining the alloy.

Through remelting and refining, the oxide inclusions in the manganese iron alloy can float to the surface of the alloy and be adsorbed by the top dross. In addition, the principle and technology of deoxidation in the steelmaking process can be used to deoxidize manganese iron alloys with aluminum and silicon to reduce oxygen content.

3.Aluminum And Titanium Content

Manganese ferrosilicon alloy contains high content of aluminum and titanium, and its control method is to enter the furnace and refining outside the furnace. The method of ferrosilicon refining can be used for reference to the dealuminum and detitanium of manganese ferrosilicon alloy outside the furnace.

4. Control Of Phosphorus Content

The phosphorus content of manganese-based ferroalloys is controlled by reducing the phosphorus in the raw materials and dephosphorizing outside the furnace. There are two methods for reducing phosphorus in raw materials: dephosphorization of manganese ore and smelting of low-phosphorus and rich manganese slag. The process of dephosphorization of manganese ore is complicated, while the process of smelting low-phosphorus and rich manganese slag is longer, and the cost and energy consumption are high. Dephosphorization outside the ferromanganese furnace may be a relatively simple and economically feasible method.

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