Steel smelting to increase Ferro Molybdene 70 yield and reduce production costs

Steel smelting to increase ferromolybdenum yield and reduce production costs

At present, in the smelting process of molybdenum-containing steel, ferromolybdenum is added to the converter together with the scrap steel in the scrap hopper. During the converter blowing process, the yield of ferromolybdenum is relatively low, only 80%-85%, which greatly increases the smelting cost. There is no specific method to increase the yield of ferromolybdenum during the smelting process.

A steel smelting method that reduces production costs and increases the yield of ferromolybdenum. The feeding method of ferromolybdenum is changed from converter feeding to feeding from a high-level silo during tapping, which solves the problem of low molybdenum yield when smelting molybdenum-containing steel. problems, and how to improve molybdenum yield, stabilize process control, and reduce costs when smelting high-quality steel to meet production requirements.

The technical solutions adopted to solve the technical problems of ferromolybdenum are:

1. Change the feeding method of ferromolybdenum from converter feeding to high-level silo feeding during tapping;

2. Ensure the working condition of the breathable bricks at the bottom of the ladle to ensure the passage of air; The granularity of ferromolybdenum is controlled to be 15mm-30mm for lumped ferromolybdenum; the tapping temperature is controlled at 1680-1710°;

3. When tapping, the argon gas flow rate blown at the bottom of the ladle is controlled at 6-7NL/(mirror) to ensure that the steel liquid level is turned over ;

4. When the steel tapping amount reaches 1/2, add alloy and ferromolybdenum in the order of AlFe-MnFe-MoFe; the slag thickness is 30-60 mm, control the slag amount in the converter;

5. After knocking, add 0.4- The aluminum particles of 0.6kg/t steel are deposited on the slag surface of the ladle.

The advantages of the new ferromolybdenum addition method effectively solve the problem of low molybdenum yield when smelting molybdenum-containing steel. The molybdenum yield increases from 80%-85% to more than 95%, which can achieve stable batch production and greatly reduce smelting costs. 

Chemical Composition

The following table shows the chemical composition of ferromolybdenum.