Control method for vanadium extraction by converter for removing vanadium and holding carbon

A control method and vanadium removal technology, which is applied in the field of metallurgical vanadium extraction, can solve the problems of shortening the optimal temperature range of vanadium oxidation, high Mfe in slag, and many factors at the end point composition and temperature, so as to eliminate the end point blowing phenomenon and recover The effect of increasing the rate and improving the main technical indicators

Active Publication Date: 2011-07-20
HEBEI IRON AND STEEL
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Problems solved by technology

But at the same time, because the process is a very complex pyrometallurgical process composed of sub-processes such as mass transfer, heat transfer, heating and dissolution of solid additives, chemical kinetics, mass balance and heat balance, there are many factors that affect the composition and temperature of the end point. , not convenient for manual control
The current vanadium extraction in the converter is a manual operation mode, which mainly judges the temperature rise rate by observing the flame with the naked eye. Too little cold material is often added to cause the molten pool to heat up too fast, shortening the optimal temperature range for vanadium oxidation, or cold material Low semi-steel temperature caused by excessive addition of slag and iron separation is not good, high Mfe in slag and other problems

Method used

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  • Control method for vanadium extraction by converter for removing vanadium and holding carbon
  • Control method for vanadium extraction by converter for removing vanadium and holding carbon
  • Control method for vanadium extraction by converter for removing vanadium and holding carbon

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Effect test

Embodiment 1

[0033] This furnace is a non-slagging furnace. The vanadium extraction converter is charged with 115 tons of molten iron, molten iron [C] 4.37%, [Si+Ti] 0.47% [V] 0.238%, the temperature is 1268 ° C, 7 tons of iron nuggets are added, and the output The amount of semi-steel is 116 tons, the target semi-steel [C] 3.85%, [V] ≤ 0.04%, and the temperature is 1380-1390°C. After the start of blowing, the temperature of the molten pool rises slowly, and the carbon-oxygen reaction gradually becomes more intense. At 35% of the planned oxygen step (the plan is the percentage of oxygen supply), the CO% is 5%. After adding iron oxide balls according to 3kg / t semi-steel, the CO% decreases due to the decrease in the temperature of the molten pool to inhibit the carbon-oxygen reaction. With the gradual progress of the blowing process, the temperature gradually rises. When the blowing progresses to the planned oxygen step of 67%, the CO% is 5%. After adding iron oxide balls according to 3kg / t...

Embodiment 2

[0036]This furnace is a non-slagging furnace. The vanadium extraction converter is charged with 114 tons of molten iron, molten iron [C] 4.41%, [Si+Ti] 0.65%, [V] 0.306%, the temperature is 1301 ° C, and 8 tons of iron nuggets are added. The amount of semi-steel produced is 116 tons, the target semi-steel [C] 3.80-3.90%, [V]≤0.04%, and the temperature is 1380-1390°C. After the start of blowing, the temperature of the molten pool rises slowly, and the carbon-oxygen reaction gradually becomes more intense. At 39% of the planned oxygen step (the plan is the percentage of oxygen supply), the CO% is 5%. After adding iron oxide balls according to 5kg / t semi-steel, the CO% decreases due to the decrease in the temperature of the molten pool to inhibit the carbon-oxygen reaction. With the gradual progress of the blowing process, the temperature gradually rises. When the blowing progresses to the planned oxygen step of 75%, the CO% is 5%, adding iron oxide balls according to 5kg / t semi...

Embodiment 3

[0039] This furnace is a slag dumping furnace. The vanadium extraction converter is charged with 115 tons of molten iron, molten iron [C] 4.37%, [Si+Ti] 0.42%, [V] 0.296%, the temperature is 1296°C, and 5 tons of iron nuggets are added. The amount of semi-steel is 114 tons, the target semi-steel [C] 3.75-3.85%, [V] ≤ 0.05%, and the temperature is 1395-1405°C. After the start of blowing, the temperature of the molten pool rises slowly, and the carbon-oxygen reaction gradually becomes more intense. At 24% of the planned oxygen step (the plan is the percentage of oxygen supply), the CO% is 5%. After adding iron oxide balls according to the 3.5kg / t semi-steel, the carbon-oxygen reaction is inhibited by the drop in the molten pool temperature, and the CO% drops . With the gradual progress of the blowing process, the temperature gradually rises. When the blowing progresses to the planned oxygen step of 43%, the CO% is 5%, adding iron oxide balls according to 3kg / t semi-steel, and ...

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Abstract

The invention provides a control method for vanadium extraction by a converter for removing vanadium and holding carbon, belonging to the technical field of metallurgical vanadium extraction. The control method adopts a fume analysis method and comprises the following steps of: connecting the signals of CO and O2 concentration curves to a computer to form continuous curves; determining the addingtime of a coolant in the vanadium extraction converting process according to the change of the CO content in the fume; prolonging the optimum temperature interval of vanadium oxidation in the converting process; and judging the vanadium extraction terminal by combining with the oxygen consumption in a vanadium extraction model. Under the condition of same molten iron, the carbon content of semi-steel can be stably controlled at 3.70-3.90% with the average value of 3.86%, which is improved by 0.14%, thus providing a stable semi-steel condition for the next steelmaking process, effectively avoiding the terminal after-blow phenomenon caused by shortage of steelmaking heat of the semi-steel, and solving the quality problem of the molten steel caused by serious after-blow. The content of residual vanadium is controlled at 0.030-0.050% and reduced by 0.004%, the average content of residual vanadium reaches 0.039%, the vanadium oxidation rate reaches 81-92% with the average value of 85% which is improved by 2% compared with the background art, and the recovery rate of vanadium is correspondingly improved, thus further improving the key technical indexes in vanadium extraction.

Description

technical field [0001] The invention relates to a method for controlling vanadium extraction in a converter to realize vanadium removal and carbon preservation, in particular to a method for controlling vanadium extraction in a converter to realize vanadium removal and carbon preservation by utilizing the change of CO content in furnace gas, and belongs to the technical field of vanadium extraction in metallurgy. Background technique [0002] Vanadium extraction by converter is a smelting process developed on the basis of oxygen top-blown converter steelmaking equipment and technology. During the process of extracting vanadium, the temperature must be controlled within a certain range. By adding coolant to control the temperature of the molten pool, the carbon-oxygen reaction can be suppressed, and the oxidation reaction of vanadium can be enhanced to form vanadium slag. Vanadium oxidation is an exothermic reaction, "low temperature" is beneficial to the oxidation of vanadiu...

Claims

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Application Information

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IPC IPC(8): C21C5/30C21C5/36
Inventor 白瑞国张兴利高海杜建良韩春良翁玉娟
Owner HEBEI IRON AND STEEL
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