Method for direct chlorination vanadium extraction of high-calcium 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: 2020-07-14
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 directly chlorinating high-calcium and high-phosphorus vanadium slag to extract vanadium, comprising 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 into the fluidized bed. Add the chlorinated raw material at the bottom of the bed, stay in the reaction for 5s and then blow it out with the gas to obtain the chlorinated product;

[0033] Step 3, separation and enrichment of chlorination products: the chlorination products are subjected to dedusting and condensation treatment to separate solid chlorination tailings and liquefied crude vanadyl trichloride liquid, and discharge the tail gas after purification; ...

Embodiment 2

[0038] A method for directly chlorinating high-calcium and high-phosphorus vanadium slag to extract vanadium, comprising 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. Add the chlorinated raw material to the bottom of the bed, stay in the reaction for 10s and then blow it out with the gas to obtain the chlorinated product;

[0041] Step 3, separation and enrichment of chlorination products: the chlorination products are subjected to dedusting and condensation treatment to separate solid chlorination tailings and liquefied crude vanadyl trichloride liquid, and discharge the tail gas after purification;

[0042] Step 4, purif...

Embodiment 3

[0046] A method for directly chlorinating high-calcium and high-phosphorus vanadium slag to extract vanadium, comprising 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 and carbon monoxide of 1:9 is introduced into the fluidized bed. Add the chlorination raw material at the bottom, stay for 30s and then blow out with the gas to obtain the chlorination product;

[0049] Step 3, separation and enrichment of chlorination products: the chlorination products are subjected to dedusting and condensation treatment to separate solid chlorination tailings and liquefied crude vanadyl trichloride liquid, and discharge the tail gas after purification;

[0050] Step 4, purificati...

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Abstract

The invention relates to a method for direct chlorination vanadium extraction of high-calcium high-phosphorus vanadium slag and belongs to the field of vanadium iron alloy smelting. According to the technical problems to be solved, the chlorination process of the high-calcium high-phosphorus vanadium slag is seriously affected by the high calcium content, and the vanadium chlorination rate is alsoaffected. The method for direct chlorination vanadium extraction of the high-calcium high-phosphorus vanadium slag includes the steps of breaking ore grinding, direct chlorination, chlorination product separation and concentration, and rough vanadium oxytrichloride liquid purification-oxidation or hydrolysis vanadium precipitation, direct chlorination is conducted, the temperature in a fluidizedbed is increased to 500 DEG C to 900 DEG C, mixed gas of chlorine and carbon monoxide is led in, a reaction is carried out, and a chlorination product is obtained. By means of the method, the problemof bonding defluidization in the high-calcium high-phosphorus vanadium slag chlorination process is solved, and efficient extracting and utilizing of vanadium resources in the high-calcium high-phosphorus vanadium slag are achieved.

Description

technical field [0001] The invention belongs to the field of vanadium-iron alloy smelting, and in particular relates to a method for directly chlorinating high-calcium and high-phosphorus vanadium slag to extract vanadium. Background technique [0002] At present, the double converter method is the main process for extracting vanadium from vanadium-titanium magnetite, that is, after blast furnace ironmaking to obtain vanadium-containing molten iron, it is blown in the first converter to obtain vanadium slag and semi-steel, and then the semi-steel enters the second Refining takes place in two converters. Generally speaking, adding lime slag to increase alkalinity in the vanadium extraction process of the 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, because the high calcium content in vanadium slag will have serious adver...

Claims

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Application Information

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Patent Type & Authority Applications(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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