Method for producing high-vanadium low-silicon high-quality vanadium slag and low-silicon-sulfur high-quality molten iron

A high-quality molten iron technology, applied in the field of producing high-vanadium and low-silicon high-quality vanadium slag and low-silicon-sulfur high-quality molten iron, can solve the problems of low vanadium grade and high content of harmful impurities such as silicon, and achieve low pollution, low cost, and increased waste discharge. Effect

Inactive Publication Date: 2019-04-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current use of oxygen blowing vanadium-containing molten iron to produce vanadium slag has the problems of low vanadium grade and high content of harmful impurities such as silicon in the slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: A tank is connected to contain vanadium-containing molten iron, the temperature is 1150°C, the silicon content in the molten iron is 0.30%wt, the sulfur content is 0.13%wt, and the vanadium content is 0.56%wt. Add desiliconization and desulfurization agents to the molten iron tank at this temperature , The added amount is 300kg, the stirring time is 15min, and the molten iron with low silicon-sulfur and high vanadium is obtained; oxygen is sprayed into the oxygen lance to blow the molten iron with low silicon-sulfur and high vanadium for 8 minutes. Finally, the silicon content in the molten iron is 0.10%wt and the sulfur content is 0.005 %Wt, the vanadium oxide content in the vanadium slag is 28.0%wt.

Embodiment 2

[0029] Example 2: A tank is connected to contain vanadium-containing molten iron, the temperature is 1360°C, the silicon content in the molten iron is 0.42%wt, the sulfur content is 0.12%wt, and the vanadium content is 0.42%wt. Add desiliconization and desulfurization agents to the molten iron tank at this temperature , The added amount is 300kg, the stirring time is 18min, and the molten iron with low silicon-sulfur and high vanadium is obtained; oxygen is sprayed into the oxygen lance to blow the molten iron with low silicon-sulfur and high vanadium for 8 minutes. The final silicon content in the molten iron is 0.12%wt and the sulfur content is 0.004 %Wt, the vanadium oxide content in the vanadium slag is 24.8%wt.

Embodiment 3

[0030] Example 3: A tank is connected to contain vanadium-containing molten iron, the temperature is 1350℃, the silicon content in the molten iron is 0.35% wt, the sulfur content is 0.08% wt, and the vanadium content is 0.38% wt. At this temperature, the desiliconization and desulfurization agents are added to the molten iron tank , The added amount is 280kg, the stirring time is 16min, and the molten iron with low silicon-sulfur and vanadium is obtained; oxygen is sprayed into the oxygen lance to blow the molten iron with low silicon-sulfur and vanadium for 9 minutes. The final obtained molten iron has a silicon content of 0.11%wt and a sulfur content of 0.003 %Wt, the vanadium oxide content in the vanadium slag is 23.%wt.

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Abstract

The invention belongs to the field of molten iron pretreatment in the metallurgical industry, and particularly discloses a method for producing high-vanadium low-silicon high-quality vanadium slag andlow-silicon-sulfur high-quality molten iron. A desilication desulfuration agent is added into a vanadium-contained molten iron, and is promoted to be decomposed at the high temperature to generate gas CO2 and solid CaO, through the gas CO2, silicon and sulphur in the molten iron are subjected to oxidation to generate gas SiO and SO2 to be escaped and removed, at the same time, continuously-introduced CO2 and CaO have a reaction with residual silicon and sulphur in the molten iron to generate SiO2 and CaS to enter a slag phase to be removed, the content of vanadium in the molten iron is hardlychanged, and the low-silicon-sulfur high-vanadium high-quality molten iron is obtained; furthermore, oxygen is used for blowing the low-silicon-sulfur high-vanadium high-quality molten iron, and twooptimized products of high-vanadium low-silicon vanadium slag and low-silicon low-sulfur molten iron are obtained. In the molten iron treatment process, slagging off is carried out for two times, SiO2and CaS slag are subjected to slagging off, and first-time slag and iron separation is achieved; after oxygen blowing, vanadium slag is subjected to slagging off, and second-time slag and iron separation is achieved; and the molten iron and vanadium slag product quality can be improved from the sources of vanadium-contained molten iron vanadium slag blowing and steel smelting, cost is low, implementation is easy and convenient, and efficiency is high.

Description

Technical field [0001] The invention belongs to the field of molten iron pretreatment in the metallurgical industry, and relates to a method that uses CaCO 3 Its decomposition products are used as desiliconization and desulfurization agents, technology for smelting high-vanadium low-silicon-vanadium slag and low-vanadium, low-silicon-sulfur steelmaking water, especially a method for producing high-vanadium, low-silicon, high-quality vanadium slag and low-silicon-sulfur high-quality molten iron. Background technique [0002] Vanadium-titanium magnetite is a kind of composite ore that symbiosis of iron, vanadium, titanium and other valuable elements. It is mainly distributed in my country's Panxi, Chengde and Ma'anshan regions. The reserves of Panxi region are more than 10 billion tons. Extracting vanadium from vanadium-containing iron water is one of the important methods for the production of vanadium in my country. However, the vanadium-containing iron produced by the smelting o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C1/04
CPCC21C1/02C21C1/025C21C1/04C21C7/0645
Inventor 隋智通娄太平王明华
Owner NORTHEASTERN UNIV
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