Method for extracting vanadium by direct chlorination of high calcium and high phosphorus vanadium slag

A high-calcium, high-phosphorus vanadium slag, direct technology, applied in the field of vanadium ferroalloy smelting, can solve the problems of vanadium chlorination rate influence, chlorine gas consumption and energy consumption, influence on chlorination process, etc. The effect of increasing the reaction rate and increasing the roasting temperature

Active Publication Date: 2022-08-05
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the high calcium content in vanadium slag will have serious adverse effects on both sodium roasting and calcification roasting processes, a new process for preparing vanadium pentoxide by chlorination of vanadium slag with high calcium and phosphorus was proposed
However, it was found in the research that the higher calcium content seriously affected the chlorination process of high-calcium and high-phosphorus vanadium slag, and the chlorination rate of vanadium was also affected. At the same time, there were problems such as long chlorination time, high chlorine consumption and energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for vanadium extraction by direct chlorination of high-calcium and high-phosphorus vanadium slag, which comprises the following steps:

[0031] Step 1, crushing and grinding: crushing and grinding the high-calcium and high-phosphorus vanadium slag to a particle size of -74 μm, accounting for 70%, to obtain chlorinated raw materials;

[0032] Step 2, direct chlorination: the temperature in the fluidized bed is raised to 900°C, and a mixed gas with a volume ratio of chlorine and carbon monoxide of 1:1 is introduced, and the flow rate of the mixed gas is 0.1 L / min per gram of Add chlorinated raw materials at the bottom of the bed, stay for 5s and blow out with gas to obtain chlorinated products;

[0033] Step 3, separation and enrichment of chlorinated products: the chlorinated products are subjected to dust removal and condensation treatment to separate solid chlorinated tailings and liquefied crude vanadium oxychloride liquid, and discharge the tail gas after pu...

Embodiment 2

[0038] A method for vanadium extraction by direct chlorination of high-calcium and high-phosphorus vanadium slag, which comprises the following steps:

[0039] Step 1, crushing and grinding: crushing and grinding the high-calcium and high-phosphorus vanadium slag to a particle size of -74 μm, accounting for 80%, to obtain chlorinated raw materials;

[0040] Step 2, direct chlorination: the temperature in the fluidized bed is raised to 750°C, and a mixed gas with a volume ratio of chlorine and carbon monoxide of 1:2 is introduced, and the flow rate of the mixed gas is 0.5L / min per gram of Add chlorinated raw materials at the bottom of the bed, stay for 10s and blow out with gas to obtain chlorinated products;

[0041] Step 3, separation and enrichment of chlorinated products: the chlorinated products are subjected to dust removal and condensation treatment to separate solid chlorinated tailings and liquefied crude vanadium oxychloride liquid, and discharge the tail gas after pu...

Embodiment 3

[0046] A method for vanadium extraction by direct chlorination of high-calcium and high-phosphorus vanadium slag, which comprises the following steps:

[0047] Step 1, crushing and grinding: crushing and grinding the high-calcium and high-phosphorus vanadium slag to a particle size of -74 μm, accounting for 90%, to obtain chlorinated raw materials;

[0048] Step 2, direct chlorination: the temperature in the fluidized bed is raised to 500°C, and a mixed gas with a volume ratio of chlorine gas and carbon monoxide of 1:9 is introduced. Add chlorinated raw materials at the bottom, stay for 30s and blow out with gas to obtain chlorinated products;

[0049] Step 3, separation and enrichment of chlorinated products: the chlorinated products are subjected to dust removal and condensation treatment to separate solid chlorinated tailings and liquefied crude vanadium oxychloride liquid, and discharge the tail gas after purification;

[0050] Step 4, purification of crude vanadyl trichl...

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Abstract

The invention relates to a method for directly chlorinating vanadium from high-calcium and high-phosphorus vanadium slag, and belongs to the field of vanadium ferroalloy smelting. The technical problem solved by the invention is that the higher calcium content seriously affects the chlorination process of the high-calcium and high-phosphorus vanadium slag, and the chlorination rate of vanadium is also affected. The invention discloses a method for vanadium extraction by direct chlorination of high-calcium and high-phosphorus vanadium slag. The temperature in the fluidized bed is raised to 500℃-900℃, the mixed gas of chlorine and carbon monoxide is introduced, and the chlorinated product is obtained after the reaction. The invention solves the problem of bond loss in the chlorination process of the high-calcium and high-phosphorus vanadium slag, and realizes the efficient extraction and utilization of vanadium resources in the high-calcium and high-phosphorus vanadium slag.

Description

technical field [0001] The invention belongs to the field of vanadium ferroalloy smelting, and particularly relates to a method for vanadium extraction by direct chlorination of high-calcium and high-phosphorus vanadium slag. Background technique [0002] At present, the converter duplex method is the main vanadium extraction process from vanadium titanomagnetite, that is, after the vanadium-containing molten iron is obtained by blast furnace ironmaking, vanadium slag and semi-steel are obtained by blowing in the first converter, and then the semi-steel enters the second Refining takes place in two converters. In general, adding lime and slag to improve basicity in the process of vanadium extraction in converter can effectively improve the dephosphorization effect, thereby reducing the dephosphorization load of steelmaking, improving the quality of molten steel and reducing production costs. However, the high calcium content in vanadium slag will have serious adverse effect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/22C22B7/04C22B1/10C22B1/08
CPCC22B34/22C22B7/04C22B7/001C22B7/006C22B1/08C22B1/10Y02P10/20
Inventor 汪劲鹏张溅波杜光超
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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