Method for extracting vanadium from molten iron

A technology for molten iron and vanadium oxidation, which is applied in the field of vanadium extraction and can solve the problems of low vanadium recovery rate and low vanadium

Inactive Publication Date: 2011-04-27
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention overcomes the defects that the grade of vanadium in the vanadium slag obtained by the existing method for extracting vanadium from molten iron is low and the recover

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1

[0034] This example is used to illustrate the method for extracting vanadium from molten iron provided by the present invention.

[0035] Blast furnace molten iron composition: C 4.49 wt%, Si 0.31 wt%, Mn 0.23 wt%, P 0.071 wt%, S 0.059 wt%, V 0.313 wt%, Ti 0.25 wt%, and the balance is iron.

[0036] Inject 141 tons of the above-mentioned blast furnace molten iron into a molten iron tank, inject a desulfurizer into the molten iron in a spray desulfurization device, and add 1134 kg of desulfurizer to desulfurize for 19 minutes (the content of CaO in the desulfurizer is 85 wt%, Na 2 CO 3 The content is 2.5% by weight, CaC 2 The content is 12.5% ​​by weight). Sampling composition of molten iron after desulfurization and slagging: C 4.40% by weight, Si 0.20% by weight, S 0.006% by weight, and V 0.308% by weight. The ratio of Si / V in molten iron decreased from 0.99 before desulfurization to 0.65 after desulfurization. The molten iron after desulfurization was injected i...

Example Embodiment

[0041] Example 2

[0042] This example is used to illustrate the method for extracting vanadium from molten iron provided by the present invention.

[0043] Blast furnace molten iron composition: C 4.86% by weight, Si 0.20% by weight, Mn 0.17% by weight, P 0.068% by weight, S 0.120% by weight, V 0.295% by weight, Ti 0.22% by weight, the balance being iron.

[0044] Inject 145 tons of the above blast furnace molten iron into a molten iron tank, spray a desulfurizer into the molten iron in a spray desulfurization device, and add 1700 kg of desulfurizer to desulfurize for 28 minutes (the content of CaO in the desulfurizer is 78.5% by weight, Na 2 CO3 content is 6% by weight, CaC 2 The content is 15.5% by weight). Sampling composition of molten iron after desulfurization and slagging: C 4.86%, Si 0.16%, S 0.012%, V 0.283%, the ratio of Si / V of molten iron decreased from 0.68 before desulfurization to 0.57. The molten iron after desulfurization was mixed into a 120-ton vanadium extractio...

Example Embodiment

[0046] Example 3

[0047] This example is used to illustrate the method for extracting vanadium from molten iron provided by the present invention.

[0048] Blast furnace molten iron composition: C 4.62% by weight, Si 0.24% by weight, Mn 0.15% by weight, P 0.075% by weight, S 0.082% by weight, V 0.291% by weight, Ti 0.09% by weight, and the balance is iron.

[0049] Inject 137 tons of the above blast furnace molten iron into a molten iron tank, spray a desulfurizer into the molten iron in a blow desulfurization device, and add 1274 kg of desulfurizer to desulfurize for 23 minutes (the content of CaO in the desulfurizer is 73.2% by weight, Na 2 CO 3 The content is 4.3% by weight, CaC 2 The content is 22.5% by weight). Sampling composition of molten iron after desulfurization and slag removal: C 4.61%, Si 0.18%, S 0.011%, V 0.278%, and the Si / V ratio of molten iron decreased from 0.82 before desulfurization to 0.65. The molten iron after desulfurization was converted into a 120-ton va...

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Abstract

The invention discloses a method for extracting vanadium from molten iron. The method comprises the following steps: contacting the molten iron with a desulfurizer, separating out the generated slag to get the desulfurized molten iron, and oxidizing the vanadium (V) in the desulfurized molten iron to vanadium pentoxide, wherein, based on the total mass of the molten iron, the molten iron comprises 0.23-0.34wt% of V and 0.04-0.15wt% of S, and the content of sulfur (S) in the desulfurized molten iron is not more than 0.02wt% due to the condition of contacting the molten iron with the desulfurizer; and the desulfurizer comprises Na2CO3, CaO and CaC2, and based on the total mass of the desulfurizer, the content of the Na2CO3 is 2.5-6wt%, the content of the CaO is 69-87.5wt% and the content of the CaC2 is 10-25wt%. By utilizing the method provided by the inventionthe sulfur is ensured to be removed from the molten iron, silicon can be removed from the molten iron to the maximum, and the loss of vanadium is reduced to the minimum at the same time, thereby greatly improving the grade of the vanadium slag and the recovery rate of vanadium during extracting the vanadium.

Description

technical field [0001] The invention relates to a method for extracting vanadium from vanadium-containing iron water. Background technique [0002] Before the molten iron is smelted in the steelmaking furnace, it is necessary to remove some harmful components or extract some beneficial components therein. Generally, it can be divided into ordinary molten iron pretreatment and special molten iron pretreatment. The former includes hot metal pre-desulfurization, hot metal pre-dephosphorization, hot metal pre-desilication, etc., and the latter includes hot metal extraction of vanadium, hot metal niobium extraction, hot metal extraction of chromium, etc. The implementation of hot metal pretreatment can effectively improve the quality of hot metal, reduce the burden of steelmaking, and create good conditions for optimizing the steelmaking process and improving steel quality; for special hot metal, the beneficial elements can be effectively recycled and comprehensively utilized th...

Claims

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Application Information

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IPC IPC(8): C22B34/22C21C7/064C21C7/072
CPCY02P10/20
Inventor 黄正华戈文荪李清春李桂军
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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