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Dephosphorization process for high phosphorous molten iron

A technology of molten iron and process, applied in the direction of improving process efficiency, manufacturing converters, etc., can solve problems such as inability to handle high-phosphorus molten iron

Inactive Publication Date: 2012-11-14
LIAONING TIANHE TECH
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Problems solved by technology

[0010] The purpose of the present invention is to solve the problem that the above-mentioned two kinds of molten iron dephosphorization pretreatment processes cannot handle high-phosphorus molten iron, research and develop a high-phosphorus molten iron dephosphorization process. ~0.30%, when the amount of dephosphorization agent reaches 20-25kg / t, the basicity of the final slag after dephosphorization is not less than 2.5, and the semi-steel [P] can be stably controlled at 0.08-0.15%, and the semi-steel [C] control range 3.3~3.6%

Method used

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  • Dephosphorization process for high phosphorous molten iron

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Embodiment Construction

[0019] Put 20kg of pig iron into a 50kg intermediate frequency induction furnace. The top of the induction furnace is equipped with an oxygen lance that can be lifted freely, and the bottom of the furnace is equipped with slit-type ventilation bricks, which have the function of simulating top-blowing and bottom-blowing compound blowing. Raise the temperature to melt the pig iron, blow nitrogen into the bottom, and raise the temperature to 1300°C after melting to carry out the thermal simulation experiment.

[0020] After the test started, oxygen was blown by lowering the gun, and scrap steel and pre-mixed slag were added at the same time. The amount of scrap steel added was 15% of the molten iron, and the slag was lime and dephosphorization agent. The first batch of slag was 70% of the total slag. %, then add the remaining slag in batches, adjust the flow rate of the bottom blowing gas to the value equivalent to the stirring energy of 3KW / t, see Table 1 for the composition of m...

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Abstract

The invention belongs to the technical field of molten iron preprocessing and relates to a dephosphorization process for high phosphorous molten iron. The dephosphorization process is performed in a converter container, the molten iron phosphorous achieves 0.20% to 0.30%, the use amount of dephosphorizing agents achieves 20kg / t to 25kg / t, the end slag basicity after dephosphorization is no less than 2.5, semi-steel [P] can be stably controlled between 0.08% to 0.10%, and semi-steel [C] is controlled in a range of 3.3% to 3.6%. The dephosphorization process has the advantages of being stable in process, low in semi-steel phosphorous, high in carbon and temperature, large in processing capability and the like, solves the problem of steelmaking by using the high phosphorous molten iron thoroughly, and improves economic benefits of iron and steel enterprises greatly.

Description

technical field [0001] The invention belongs to the field of pig iron refining and is mainly used for the dephosphorization treatment of molten iron in a converter. technical background [0002] my country's iron and steel industry has experienced a period of rapid development in the past ten years. The designed production capacity of iron and steel plants is nearly one billion tons. In 2010, my country's crude steel output reached 625 million tons. The problem of overcapacity in iron and steel enterprises is extremely prominent. Affected by the slowdown of national high-speed railway construction and the regulation and control policies of real estate and factories, steel consumption has shown an obvious downward trend since the second half of 2011, and my country's iron and steel enterprises are facing a serious survival crisis. The pace of structural adjustment and elimination of backwardness in the iron and steel industry will be further accelerated. The thermodynamic ad...

Claims

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Application Information

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IPC IPC(8): C21C5/28
CPCY02P10/20
Inventor 陈云天
Owner LIAONING TIANHE TECH
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