Classification by Carbon Content
Ferromanganese is divided into 3 categories according to its carbon content:
Low carbon category: carbon no more than 0.7 percent. Medium carbon type: carbon from about 0.7 percent to 2.0 percent. High carbon type: carbon from about 2.0 percent to 8.0 percent.
Charge Calculation Procedure
To calculate ingredients, generally follow the following procedures and requirements:
(1) Raw materials and product specifications: Determine the production grade and composition of medium and low carbon ferromanganese; and the raw material composition, including silicon-manganese alloy, manganese ore, lime, and other raw materials entering the furnace.
(2) Parameter selection: Determination of the element distribution coefficient, including alloy entry, slag entry, and volatilization loss; the utilization rate of silicon in the silicon-manganese alloy, including the amount oxidized by air or high-priced oxide decomposed oxygen, the amount of silicon entering the alloy, and the quantity of the reduction reaction; and the selection and determination of slag alkalinity.
(3) Calculation: Based on 100 kg of manganese ore, the high-priced oxide of manganese is thermally decomposed into Mn3O4 and reduced by silicon; likewise, Fe2O3 is reduced by silicon. The calculation includes the proportion of manganese ore and the composition of the mixed manganese ore; the amount of silicon-manganese alloy required; the amount of lime required; the material batch composition (kg); the alloy weight and composition; and the slag weight and composition.
Frequently Asked Questions
What is the carbon limit of low carbon ferromanganese? No more than 0.7 percent.
What is the carbon range of medium carbon ferromanganese? About 0.7-2.0 percent.
What is the carbon range of high carbon ferromanganese? About 2.0-8.0 percent.
