Method for preparing low-silicon-titanium-type vanadium slag from vanadium-containing molten iron

A technology for low-silicon titanium molten iron and molten iron, which is applied in the field of preparing low-silicon titanium type vanadium slag from vanadium-containing molten iron with "desiliconization and vanadium preservation", can solve the problems of low silicon-titanium impurity content, high vanadium content, and high silicon in slag, and achieves the The effect of low content of silicon and titanium impurities, high content of vanadium and good quality

Active Publication Date: 2017-11-03
隋智通
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Problems solved by technology

[0014] The purpose of the present invention is to provide a method for preparing low-silicon-titanium vanadium slag from vanadium-containing molten iron, which solves the problem of high silicon content and low vanadium in the slag existing in the existing vanadium-containing molten iron blowing vanadium slag technology, and its process flow design is reasonable. Simple operati

Method used

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  • Method for preparing low-silicon-titanium-type vanadium slag from vanadium-containing molten iron

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preparation example Construction

[0034] according to figure 1 And the specific preparation method of the present invention is explained in detail by embodiment. The specific operation of the method for preparing low-silicon titanium type vanadium slag from the vanadium-containing molten iron comprises the following steps:

[0035] Step 1 Determine the quality of vanadium-containing molten iron in the molten iron tank

[0036] The vanadium-containing molten iron is contained in the molten iron tank 3 installed in the temperature control furnace 2, and the temperature is controlled in the range of 1250-1550°C. The capacity of the vanadium-containing molten iron in the molten iron tank 3 accounts for 75-85% of the volume of the whole tank. Use sampling tube 4 to sample and detect vanadium-containing molten iron so that the mass percent content of silicon in vanadium-containing molten iron should be no less than 0.30% and no greater than 1.20%, and the mass percent content of vanadium should be no less than 0.10...

Embodiment 1

[0049] (1) Vanadium-containing molten iron is filled in the molten iron tank 3, and the temperature is controlled not to be higher than 1550°C. The capacity of the vanadium-containing molten iron in the molten iron tank 3 accounts for 75% of the total tank volume, and the mass percentage of silicon in the vanadium-containing molten iron is detected to be 1.2% , the mass percentage of vanadium is 0.68%, and the mass percentage of titanium is 0.25%.

[0050] (2) Add an additive of 8% of the total mass of molten iron in the molten iron tank 3, and the additive is lime (CaO).

[0051] (3) Keep the temperature at 1550°C, and the weak oxidizing gas passed into the vanadium-containing molten iron is CO 2 Gas mixed with oxygen mixed gas, mixed with weak oxidizing gas CO 2 The proportion of oxygen in the weak oxidizing gas CO 2 8% of the volume, the gas flow rate is 2.0 L / min, and the aeration time is 12 minutes. After the shallow oxidation is completed, the scum produced by the desi...

Embodiment 2

[0054] (1) Vanadium-containing molten iron is filled in the molten iron tank 3, and the temperature is controlled not to be higher than 1500°C. The capacity of the vanadium-containing molten iron in the molten iron tank 3 accounts for 75% of the total tank volume, and the mass percentage of silicon in the vanadium-containing molten iron is detected to be 0.94% , the mass percentage of vanadium is 0.48%, and the mass percentage of titanium is 0.22%.

[0055](2) Add additives of 6% of the total mass of molten iron in the molten iron tank 3, the additives are lime (CaO) and fluorite (CaF 2 ).

[0056] (3) Keep the temperature at 1500°C, and the weak oxidizing gas passed into the vanadium-containing molten iron is CO 2 Mixed gas of gas mixed with air, mixed with weak oxidizing gas CO 2 The proportion of air in the weak oxidizing gas CO 2 10% of the volume, the gas flow rate is 2.0 L / min, and the aeration time is 15 minutes. After the shallow oxidation is completed, the scum pro...

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Abstract

The invention relates to a method for preparing low-silicon-titanium-type vanadium slag from vanadium-containing molten iron. The method solves the problem that the vanadium slag which is melted by blowing from the vanadium-containing molten iron in an existing technology is high in silicon content and low in vanadium content. According to the method, a weak oxidizing gas is blown to the high-silicon low-vanadium molten iron as a weak oxidizing agent for removing the silicon, the silicon in the vanadium-containing molten iron is slightly oxidized into a silicon oxide gas to be removed, the vanadium in optimized molten iron is hardly oxidized, and the obtained optimized molten iron is high in vanadium content and low in silicon content; and then oxygen is used as a strong oxidizing agent to deeply oxidize the high-vanadium low-silicon purified molten iron, and the high-quality high-vanadium low-silicon vanadium slag is obtained. The method has the advantages of being reasonable in technological process design, simple, convenient, safe and stable in operation and free of environmental pollution and waste discharge. The vanadium slag prepared by the method is excellent in quality, low in silicon impurity content and titanium impurity content, and high in vanadium content. When the high-quality vanadium slag is used, the quality of vanadium pentoxide in the subsequent preparation and the quality of metal vanadium and vanadium series alloys prepared by the vanadium pentoxide can be remarkably improved, the technical process of subsequent preparation is simplified, and the economic and social benefits are improved.

Description

technical field [0001] The invention relates to a new process for preparing vanadium slag from vanadium-containing molten iron, in particular a method of "shallowly oxidizing" high-silicon and low-vanadium molten iron by using a weak oxidant to obtain "de-siliconized and vanadium-containing" vanadium-containing molten iron to prepare low-silicon-titanium type The method of vanadium slag. The high-vanadium, low-silicon and titanium-type vanadium slag finally obtained by the method is used as a raw material for extracting vanadium, and the obtained low-vanadium and low-silicon-titanium molten iron is transported to a steelmaking plant for use as molten iron for oxygen steelmaking. Background technique [0002] Vanadium-titanium magnetite is a compound ore in which iron, vanadium, titanium and other valuable elements coexist. my country has abundant reserves of vanadium-titanium magnetite, which are mainly distributed in Panxi, Chengde and Ma'anshan. Extracting vanadium from v...

Claims

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Application Information

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IPC IPC(8): C21C7/072C21C7/076
CPCC21C7/0087C21C7/072C21C7/076Y02P10/20
Inventor 隋智通娄太平王明华
Owner 隋智通
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