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Method for producing ferrosilicon alloy by use of silica fume

A technology of ferrosilicon alloy and micro-silicon powder, applied in the field of ferrosilicon alloy production, can solve the problems of occupying the production area, environmental pollution around the factory, waste of silicon ore resources, etc., to solve environmental problems, reduce the amount of silica, and improve the economic benefits of enterprises Effect

Active Publication Date: 2014-02-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
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Problems solved by technology

A large amount of small-sized silicon ore and micro-silica powder are piled up in the factory area, which not only causes waste of silicon ore resources and reduces the economic benefits of the factory, but also occupies a large area of ​​the production area and brings pollution to the surrounding environment of the factory area. Threat to the healthy development of enterprises

Method used

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  • Method for producing ferrosilicon alloy by use of silica fume

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 1 As shown, the method for producing ferrosilicon alloy using micro-silicon powder, its concrete steps are as follows:

[0029] (1) First, add a binder of 2% mass of microsilica fume and water of 3% mass of microsilica fume to microsilica fume and small particle silica, mix evenly, and press it into pellets under a pressure of 5t, in which microsilica SiO in powder 2 Content 90.4wt.%, Al 2 o 3 The content is 1.2wt.%, the particle size of small particles of silica is less than 5mm, the amount added is 40% of the mass of silica fume, the binder is coal tar, and the particle size of pellets is 25mm;

[0030] (2) Under a reducing atmosphere, after drying the pellets obtained in step (1) at a temperature of 100°C for 6 hours, put the dried pellets and carbonaceous reducing agent with a mass ratio of 2.4:1.0 into the surface temperature In a metallurgical furnace with a temperature of 800°C, the pellets and carbonaceous reducing agent are pre-roasted during...

Embodiment 2

[0036] Such as figure 1 As shown, the method for producing ferrosilicon alloy using micro-silicon powder, its concrete steps are as follows:

[0037] (1) First, add a binder of 12% of the mass of microsilica fume and water of 15% of the mass of microsilica fume to the microsilica fume and small-grained silica, mix them evenly, and press them into pellets under a pressure of 30t, in which microsilica SiO in powder 2 Content 88.5wt.%, Al 2 o 3 The content is less than 1.4wt.%, the particle size of small particles of silica is less than 5mm, the amount added is less than 50% of the mass of microsilica fume, the binder is coal tar pitch and wood fiber with a mass ratio of 1:1, and the particle size of pellets is 150mm;

[0038] (2) Under a reducing atmosphere, after drying the pellets obtained in step (1) at a temperature of 300°C for 0.5 h, put the dried pellets and carbonaceous reducing agent with a mass ratio of 3.0:2.0 on the surface In a metallurgical furnace with a temp...

Embodiment 3

[0045] Such as figure 1 As shown, the method for producing ferrosilicon alloy using micro-silicon powder, its concrete steps are as follows:

[0046] (1) First, add a binder of 8% of the mass of microsilica fume and water of 10% of the mass of microsilica fume to the silica fume and small particles of silica, mix evenly, and press it into pellets under a pressure of 15t, in which microsilica SiO in powder 2 Content 86.3wt.%, Al 2 o 3 The content is 1.2wt.%, the particle size of small particles of silica is less than 5mm, the amount added is 48% of the mass of microsilica fume, the binder is coal tar, and the particle size of pellets is 100mm;

[0047] (2) Under a reducing atmosphere, after drying the pellets obtained in step (1) at a temperature of 150°C for 4 hours, put the dried pellets and carbonaceous reducing agent with a mass ratio of 2.5:1.5 into the surface temperature In a metallurgical furnace with a temperature of 900°C, the pellets and carbonaceous reducing age...

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Abstract

The invention relates to a method for producing a ferrosilicon alloy by use of silica fume, belonging to the technical field of ferrosilicon alloy and industrial silicon. The method comprises the steps of firstly adding a binder and water into silica fume and granular silica, mixing uniformly and pressing into pellets; in a reducing atmosphere, drying the pellets obtained by the previous step; putting the dried pellets and a carbonaceous reducing agent into a metallurgical furnace; pre-roasting the pellets and carbonaceous reducing agent in a descending process from the furnace mouth of the metallurgical furnace to a high-temperature area; smelting the pellets and carbonaceous reducing agent in the high-temperature area of the metallurgical furnace while adding steel cuttings, steel rolling iron sheet and iron ore concentrate iron-containing raw material in the smelting process to obtain a ferrosilicon alloy melt; performing external refining of the ferrosilicon alloy melt obtained by the previous step to obtain the ferrosilicon alloy. According to the method provided by the invention, the silica fume and granular silica are pelletized to serve as a silicon source to produce the ferrosilicon alloy, so that an effective means of utilizing the waste silica fume and granular silica in the production process of the ferroalloy industry is provided.

Description

technical field [0001] The invention relates to a method for producing ferrosilicon alloy by utilizing micro-silicon powder, and belongs to the technical field of ferrosilicon alloy and industrial silicon. Background technique [0002] Ferrosilicon alloy and industrial silicon belong to silicon-based alloys in the ferroalloy industry, and are widely used in steelmaking, casting, non-ferrous metals and other industrial production. The production of ferrosilicon alloy and industrial silicon is based on silica, which is mixed with carbonaceous reducing agent and added to submerged arc furnace after washing, and then obtained by carbothermal reduction under high temperature conditions to obtain ferrosilicon alloy and metal silicon. [0003] In the production of ferrosilicon alloy and industrial silicon, in order to ensure the gas permeability of the charge, the charge is required to be within a certain particle size range. During the cleaning process of silicon ore, the silicon...

Claims

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Application Information

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IPC IPC(8): C22C1/10
Inventor 魏奎先马文会宁哲谢克强伍继君周阳杨斌刘大春戴永年
Owner KUNMING UNIV OF SCI & TECH
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