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A kind of method for extracting vanadium chromium by converter

A converter, vanadium-chromium technology, used in the manufacture of converters, etc., to overcome the low conversion temperature, reduce carbon oxidation rate, and ensure the effect of oxidation rate

Active Publication Date: 2017-03-15
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] From above-mentioned prior art, adopt re-blown converter to extract vanadium chromium and have not been reported yet, still belong to precedent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] After the 80t converter is finished adding iron, the oxygen lance is used to supply the mixed gas, O 2 with CO 2 The ratio is 3:1; the oxygen lance is lowered in place, and 40% coolant is added after successful ignition. 10% of the coolant is added 2 minutes before the blowing is stopped, and the oxygen blowing time is controlled at 6 minutes; when the oxygen lance blows the mixed gas, the gun position is controlled in the "high-low-high" mode, that is, 1.6 is used for the first 1.0 minutes of blowing. m high lance position (i.e. oxygen lance is 1.6m away from molten iron surface), 1.5m low lance position (i.e. oxygen lance is 1.5m away from molten iron surface) in the mid-term, and 1.6m high lance position (i.e. oxygen The gun is 1.6m away from the molten iron surface); according to the capacity of the converter, the mixed gas pressure is 0.60MPa and the flow rate is controlled at 8000Nm 3 / h, the amount of mixed gas is 10Nm 3 / tFe; the amount of coolant is controll...

Embodiment 2

[0050] After the 200t converter is finished adding iron, the oxygen lance is used to supply the mixed gas, O 2 with CO 2 The ratio is 8:1; the oxygen lance is lowered in place, and 20% coolant is added after successful ignition. % of the coolant is added 2 minutes before the blowing is stopped, and the oxygen blowing time is controlled at 12 minutes; when the oxygen lance blows the mixed gas, the lance position is controlled in the "high-low-high" mode, that is, the 0.5min in the early stage of blowing is 2.2m High lance position (i.e. oxygen lance is 2.2m away from molten iron level), mid-term adopts 1.8m low lance position (i.e. oxygen lance is 1.8m away from molten iron level), 1.5min before the end of blowing adopts 2.0m high lance position (i.e. oxygen lance 2.0m from the liquid level of molten iron); according to the capacity of the converter, the mixed gas pressure is 1.0MPa, and the flow rate is controlled at 25000Nm 3 / h, the amount of mixed gas is 30Nm 3 / tFe; the...

Embodiment 3

[0052] After the 140t iron mixing is completed, the oxygen lance is used to supply the mixed gas, O 2 with CO 2 The ratio is 5:1; the oxygen lance is lowered in place, and 30% coolant is added after successful ignition. The remaining coolant is added 2 minutes before the blowing is stopped, and the oxygen blowing time is controlled at 10 minutes; when the oxygen lance blows the mixed gas, the lance position is controlled in the "high-low-high" mode, that is, 1.9m is used for 1.0 minutes in the early stage of blowing. High lance position (i.e. oxygen lance is 1.9m away from molten iron surface), 1.7m low lance position (i.e. oxygen lance is 1.7m away from molten iron surface) in the mid-term, 1.9m high lance position (i.e. oxygen lance 1.9m away from the liquid level of molten iron); according to the capacity of the converter, the mixed gas pressure is 0.85MPa, and the flow rate is controlled at 16000Nm 3 / h, the amount of mixed gas is 25Nm 3 / tFe; the amount of coolant is c...

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Abstract

The invention relates to a method of extracting vanadium and chromium in a converter, belongs to the field of iron and steel smelting, and solves the technical problems. The method of extracting vanadium and chromium in the converter comprises the following steps: mixing vanadium and chromium molten steel into the converter, and top blowing mixed gas consisting of O2 (Oxygen) and CO2 (Carbon Dioxide) into the vanadium and chromium molten steel; meanwhile, carrying out bottom blowing on CO (Carbon Oxide), and adding a coolant to control the temperature of the vanadium and chromium molten steel to 1320-1390 DEG C in the course of top and bottom combined blowing, so as to obtain vanadium and chromium residues and semi-steel, wherein the coolant is added in three times: adding 20-40% of coolant after an oxygen lance is reduced in place to ignite successfully, adding 30-50% of coolant after blowing for 1-2.5min, and adding the rest of coolant before stopping blowing. According to the method provided by the invention, the higher vanadium oxidation rate can be ensured, the oxidation rate of the chromium can be ensured, the oxidation rate of carbon can be reduced, and the comprehensive utilization of resources can be beneficially realized.

Description

technical field [0001] The invention relates to a method for extracting vanadium and chromium in a converter, belonging to the field of iron and steel smelting. Background technique [0002] my country is a big country of vanadium-titanium magnetite, which is mainly distributed in Panxi, Sichuan, Chengde, Hebei and other regions; according to Cr 2 o 3 The vanadium-titanium magnetite is divided into ordinary vanadium-titanium magnetite and high-chromium vanadium-titanium magnetite (referred to as high-chromium vanadium-titanium magnetite). As a special vanadium-titanium magnetite resource, high-chromium vanadium-titanium magnetite resources are accompanied by precious chromium resources in addition to iron, vanadium, and titanium. Hongge vanadium-titanium magnetite in Panzhihua area is the largest in my country. Chromium ore resources, reserves of 3.6 billion tons, containing Cr 2 o 3 As high as 18 million tons, nearly twice the proven reserves in other parts of the countr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C5/36
Inventor 陈炼谢兵王建戈文荪曾建华董克平黄正华李龙蒋龙奎
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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