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Method for producing ferrosilicon at low cost

A low-cost, ferrosilicon technology, applied in the field of metallurgy, can solve the problems of hindering the growth of steel grains, endangering the performance of spring steel, and being difficult to remove, and achieve the effect of wide sources and reduced production costs

Active Publication Date: 2013-07-17
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ti entering the steel will form very small and stable TiC, TiN and Ti(CN) particles, which will strongly hinder the grain growth of the steel, especially have a very bad effect on the iron loss of high-grade silicon steel; and TiO present in molten steel 2 The inclusions are also difficult to remove during the refining process, which is harmful to the performance of spring steel, bearing steel, cord steel and other products

Method used

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  • Method for producing ferrosilicon at low cost

Examples

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example 1

[0021] Example 1: A certain ferroalloy production plant adopts the method of the present invention to select ash content of 65%, carbon content of 35% and SiO in its ash content 2 Carbonized rice husk with a mass percentage of 90% and steel shavings with an iron content of 95% are raw materials, and the mass percentages of each raw material are: 90% carbonized rice husk and 10% steel shavings. 75% ferrosilicon was produced in the submerged arc furnace and supplied to the steel mill for use as a molten steel deoxidizer. The results show that the composition of the ferrosilicon alloy fully meets the requirements, and no titanium addition to molten steel occurs during use.

example 2

[0022] Example 2: A certain ferroalloy production plant adopts the method of the present invention, selects the ash content to be 65%, the carbon content to be 35% and SiO in the ash 2 Carbonized rice husk with a mass percentage of 90% and steel shavings with an iron content of 95% are raw materials, and the mass percentages of each raw material are: 95% carbonized rice husk and 5% steel shavings. 75% ferrosilicon was produced in the submerged arc furnace and supplied to the steel mill for use as a molten steel deoxidizer. The results show that the composition of the ferrosilicon alloy fully meets the requirements, and no titanium addition to molten steel occurs during use.

example 3

[0023] Example 3: A certain ferroalloy production plant adopts the method of the present invention, selects the ash content to be 70%, the carbon content to be 30% and SiO in the ash 2 Carbonized rice husk with a mass percentage of 90% and steel shavings with an iron content of 95% are raw materials, and the mass percentages of each raw material are: 93% carbonized rice husk and 7% steel shavings. 75% ferrosilicon was produced in the submerged arc furnace and supplied to the steel mill for use as a molten steel deoxidizer. The results show that the composition of the ferrosilicon alloy fully meets the requirements, and no titanium addition to molten steel occurs during use.

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Abstract

The invention relates to a method for producing ferrosilicon at low cost. The method comprises the following steps of: preparing carbonized rice husks and an iron donor according to the content of silicon in the finally obtained ferrosilicon, uniformly mixing the carbonized rice husks and the iron donor, adding into a submerged arc furnace, and smelting to obtain the ferrosilicon, wherein the smelting temperature is controlled to be between 1,700 and 1,750 DEG C. The ferrosilicon is prepared from the carbonized rice husks and the iron donor (such as steel scraps or an iron oxide material), and silica and coke in the traditional method are eliminated, so that the preparation cost of the ferrosilicon is greatly reduced; and meanwhile, the ferrosilicon prepared by the method contains little titanium, so that the problem that the titanium is added into molten steel in the processes of deoxidizing and alloying a steel grade which has strict restriction on the titanium by using the ferrosilicon is solved.

Description

technical field [0001] The invention relates to a ferroalloy production method, in particular to a method for producing ferrosilicon by utilizing carbonized rice husks, and belongs to the technical field of metallurgy. Background technique [0002] Ferrosilicon is a deoxidizer for steelmaking and an alloying agent for smelting silicon steel. When smelting spring steel and heat-resistant steel, a certain amount of ferrosilicon should also be added as an alloying agent. In order to obtain a qualified chemical composition and ensure the quality of steel, molten steel must be deoxidized during the tapping stage of the steelmaking process. The chemical affinity between silicon and oxygen is very high, so ferrosilicon is an indispensable deoxidizer in the steelmaking industry . In addition, adding a certain amount of silicon to steel can significantly improve the strength, hardness and elasticity of steel. Therefore, when smelting structural steel, tool steel, spring steel and ot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B4/06
CPCY02P10/20
Inventor 鲁永剑王谦杨颖何生平
Owner CHONGQING UNIV