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Composite desiliconization and dephosphorization agent for molten iron pretreatment and preparation method thereof

A technology of molten iron pretreatment and silicon dephosphorization agent, applied in the direction of improving process efficiency, etc., can solve the problems of dust environment and human health hazards, low utilization rate, and small amount of red mud utilization, so as to reduce the harm to the environment and human body , good economic and social benefits, and the effect of ensuring the effect of desiliconization and dephosphorization

Active Publication Date: 2020-06-05
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The cost of soda-based desiliconization and dephosphorization agents is high, the temperature drop of molten iron is relatively large during the treatment process, and it is easy to cause environmental pollution and corrosion of refractory materials and equipment, so it is generally not used
At present, lime-based desiliconization and dephosphorization agents composed of fluorite, iron oxide scale and lime are widely used, but the existence of fluoride will cause serious environmental pollution
[0008] Chinese patent CN200410013065.6 discloses a molten iron pretreatment agent and its preparation method, specifically, red mud and Fe 2 o 3 , CaO, Na 2 CO 3 , MnO 2 , CaCl 2 , SiO 2 Or other metallurgical wastes containing these components are mixed and ground to obtain the molten iron pretreatment agent, which ensures the high oxidation, strong alkalinity and good melting performance of the molten iron pretreatment agent, but there are many types of ingredients and complex process ratios. The utilization of red mud is small, only accounting for 15-30% of the ratio of molten iron pretreatment agent
Chinese patent CN201110117960.2 discloses a molten iron pretreatment dephosphorization agent containing magnesium slag, specifically, magnesium slag, barium carbonate, converter sludge, iron oxide scale, fluorite, B 2 o 3 Mixed and formulated as a dephosphorization agent, the dephosphorization effect is good, but the fluorite contains a large amount of fluoride, which will bring a series of environmental pollution problems
Such a precious and abundant secondary resource, due to its low utilization rate, most of it can only be piled up in the open environment, which not only wastes resources, but also produces a large amount of dust and toxic V 5+ 、Cr 6+ cause great harm to the environment and human health

Method used

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  • Composite desiliconization and dephosphorization agent for molten iron pretreatment and preparation method thereof
  • Composite desiliconization and dephosphorization agent for molten iron pretreatment and preparation method thereof
  • Composite desiliconization and dephosphorization agent for molten iron pretreatment and preparation method thereof

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preparation example Construction

[0040] The present invention also provides a preparation method of molten iron pretreatment composite desiliconization and dephosphorization agent, which comprises the following steps:

[0041] Step S1, vanadium extraction tailings and active lime are sequentially crushed and screened to obtain vanadium extraction tailings and active lime with a particle size below 0.5 mm, and then dried.

[0042] Obtain vanadium extraction tailings and active lime with a particle size below 0.5mm to facilitate the transportation and loading of vanadium extraction tailings and active lime.

[0043] Step S2. Weigh the dried vanadium extraction tailings and active lime according to the amount of the vanadium extraction tailings and active lime in the composite desiliconization and dephosphorization agent, and mix them uniformly to obtain a composite desiliconization and dephosphorization agent.

[0044] The preparation method of the hot metal pretreatment composite desiliconization and dephospho...

Embodiment 1

[0047] In this embodiment, vanadium extraction tailings after sodium roasting and leaching of vanadium slag from a domestic steel plant were selected as raw materials.

[0048] Step S1, vanadium extraction tailings and active lime are sequentially crushed and screened to obtain vanadium extraction tailings and active lime with a particle size below 0.5 mm, and then dried.

[0049] Step S2. Weigh the dried vanadium extraction tailings and active lime according to the mass ratio of 77:23, and mix them evenly to obtain a melting point of 1236.0°C and an alkalinity of CaO / SiO 2 2.1 Composite desiliconization and dephosphorization agent for molten iron pretreatment. Wherein, the melting point of the composite desiliconization and dephosphorization agent is measured according to the hemispherical method. The specific chemical composition of the hot metal pretreatment composite desiliconization and dephosphorization agent is shown in Table 1.

[0050] The chemical composition of mo...

Embodiment 2

[0054] In this embodiment, vanadium extraction tailings after sodium roasting and leaching of vanadium slag from a domestic steel plant were selected as raw materials.

[0055] Step S1, vanadium extraction tailings and active lime are sequentially crushed and screened to obtain vanadium extraction tailings and active lime with a particle size below 0.5 mm, and then dried.

[0056] Step S2. Weigh the dried vanadium extraction tailings and active lime according to the mass ratio of 71:29, and mix them evenly to obtain a melting point of 1260.1°C and an alkalinity of CaO / SiO 2 It is a composite desiliconization and dephosphorization agent for hot metal pretreatment of 2.8. Wherein, the melting point of the composite desiliconization and dephosphorization agent is measured according to the hemispherical method. The specific chemical composition of the hot metal pretreatment composite desiliconization and dephosphorization agent is shown in Table 2.

[0057] The chemical composit...

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Abstract

The invention provides a hot metal pretreatment composite desiliconization and dephosphorization agent. The composite desiliconization and dephosphorization agent comprises extracted vanadium tailingsand active lime which are mixed uniformly, and the extracted vanadium tailings account for 60%-90% of the composite desiliconization and dephosphorization agent by weight; and the active lime accounts for 10%-40% of the composite desiliconization and dephosphorization agent by weight. Not only are the extracted vanadium tailings utilized effectively, but also the silicon and phosphorus contents in hot metal can be reduced effectively; and high quality hot metal is provided for steelmaking, and meanwhile the recovery of iron resources in the composite desiliconization and dephosphorization agent can be achieved in the hot metal pretreatment process. The invention further provides a preparation method of the hot metal pretreatment composite desiliconization and dephosphorization agent, andthe preparation method comprises the steps of drying the extracted vanadium tailings and the active lime, and then uniformly mixing the dried extracted vanadium tailings and the dried active lime according to the amounts of the extracted vanadium tailings and the active lime in the composite desiliconization and dephosphorization agent, so that the composite desiliconization and dephosphorizationagent is obtained. The proportioning and preparation are simple, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of molten iron pretreatment in the iron and steel metallurgy industry, and in particular relates to a composite desiliconization and dephosphorization agent for molten iron pretreatment and a preparation method thereof. Background technique [0002] In the iron and steel metallurgical industry, in order to improve the quality of steel, hot metal pretreatment is an essential process in the steelmaking process. The molten iron pretreatment process is mainly to provide molten iron with stable composition and low silicon and phosphorus content for the steelmaking process, so as to facilitate the operation and control of steelmaking. Two important tasks in hot metal pretreatment are hot metal pretreatment desiliconization and hot metal pretreatment dephosphorization. [0003] Desiliconization of hot metal pretreatment is mainly to use oxidant to oxidize Si in hot metal to SiO 2 into the slag for removal: [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/02C21C1/04
CPCY02P10/20
Inventor 姜茂发孙嘉丽张波刘承军
Owner NORTHEASTERN UNIV LIAONING
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