Vanadium slag treatment method capable of saving energy and reducing emission

A treatment method, energy-saving and emission-reducing technology, applied in the direction of improving process efficiency, etc., can solve the problems of not adding lime to slag, wasting physical heat, and affecting production, so as to reduce pollutant emissions, save energy, and improve production efficiency. Effect

Inactive Publication Date: 2011-06-08
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The current process has an obvious shortcoming. The high-temperature vanadium slag at 1400-1500°C is cooled to room temperature for treatment, and then roasted to 800-1000°C to promote the reaction of vanadium to form water-soluble sodium vanadate. Obviously, the vanadium slag temperature One drop and one liter waste a lot of physical heat
In addition, the vanadium extraction operation is carried out at the initial stage of the steelmaking process. If calcium oxide is mixed into the slag, a part of vanadium pentoxide in the slag will form water-insoluble calcium vanadate with calcium oxide during the subsequent oxidation roasting process. Lime slagging cannot be added in the vanadium extraction process, which leads to the failure of dephosphorization in the early stage of the steelmaking process. As a last resort, the dephosphorization process is placed in the later stage of steelmaking, which has a negative impact on production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Pour 4 tons of liquid vanadium slag at about 1450°C and containing very little calcium oxide into the slag tank, and the clearance of the slag tank is about 15cm. Add Na in a certain proportion according to the grade of vanadium in the slag 2 CO 3 , Na 2 CO 3 Adding amount according to Na 2 O and V 2 o 5 The molar ratio is about 3. The way of adding is to add 1 / 2 first along with the slag discharge process of the converter, and add 1 / 2 to the surface after the slag is discharged. After the slag is discharged, the water-cooled subsonic oxygen lance is inserted obliquely into the slag tank to blow oxygen, and the nozzle extends under the slag liquid surface, which can play a stirring role while supplying oxygen. After 3.5 minutes of oxygen blowing, the blowing gun was stopped, and the fluidity of the slag liquid was good. Sampling analysis shows that "FeO / T.Fe" is approximately equal to 0.25.

Embodiment 2

[0030] Pour 4.25 tons of liquid vanadium slag at about 1450°C and containing a small amount of calcium oxide into the slag tank, and the clearance of the slag tank is about 15cm. Slag in V 2 o 5 The content is about 16%. Add 750kg of Na at one time after slagging 2 CO 3 and 200kg of NaCl into the slag tank, Na 2 O and V 2 o 5The molar ratio is about 2.3. Then the water-cooled subsonic oxygen lance is inserted obliquely into the slag tank to blow oxygen, and the nozzle extends below the slag liquid level. After 4 minutes of oxygen blowing, the blowing gun was stopped, and the fluidity of the slag liquid was good. Sampling analysis shows that "FeO / T.Fe" is approximately equal to 0.14.

Embodiment 3

[0032] Pour 3.5 tons of liquid vanadium slag containing about 20% calcium oxide at about 1400°C into the slag tank. The clearance of the slag tank is about 20cm. 2 CO 3 , Na 2 CO 3 Adding amount according to Na 2 O and V 2 o 5 The molar ratio is about 2.5. The addition method is to add 1 / 2 of the slag tank before slag extraction, add 1 / 2 to the surface after slag extraction, and blow oxygen obliquely into the slag tank with a water-cooled single-hole supersonic oxygen gun after the slag extraction, the nozzle is 10cm away from the slag liquid surface Left and right, it can play a stirring role while supplying oxygen. Due to the low temperature and poor fluidity of the slag liquid, anthracite was added to the fire point area to raise the temperature. The addition amount was 1kg of anthracite / ton of slag. After blowing oxygen for about 4 minutes, the blowing gun was stopped, and the slag liquid had good fluidity. Sampling analysis shows that "FeO / T.Fe" is approximately eq...

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Abstract

The invention belongs to the field of rare metal extraction, and particularly relates to a vanadium slag treatment method capable of saving energy and reducing emission. The method comprises the following concrete steps: first, placing high-temperature liquid vanadium slag with the temperature of higher than 1200 DEG C, which is separated from molten iron, in a slag tank; then, adding a sodium compound into the slag tank according to the grade of the vanadium slag; and supplying oxygen to the slag tank with a water-cooling supersonic speed or subsonic speed oxygen lance to produce a strong oxidizing atmosphere while realizing a stirring effect to promote quick generation of water-soluble sodium vanadate in the vanadium slag, wherein in order to ensure that the supplied oxygen is more than the oxygen required for totally oxidizing all components in the slag into the highest-valence oxides, FeO / T.Fe in the slag is taken as an index for checking the oxidation degree, V2O5 generated in the vanadium slag reacts with the added sodium compound to generate the water-soluble sodium vanadate, and finally the obtained slag containing the water-soluble sodium vanadate is treated to obtain V2O5. The method provided by the invention realizes vanadium extraction and steelmaking at the same time; and by adopting the method, tremendous economical and environmental benefits can be produced.

Description

technical field [0001] The invention belongs to the field of rare metal extraction, and in particular relates to a vanadium slag treatment method for energy-saving and emission-reducing extraction of vanadium from vanadium slag. Background technique [0002] Vanadium is widely distributed in nature, and the abundance in the earth's crust is about 135×10 -6 . Among them, vanadium-titanium magnetite is the main mineral raw material for the production of vanadium, and it is found in China, the former Soviet Union, the United States, South Africa, Finland, Sweden, Norway, India, Australia and other countries. More than 60% of the world's vanadium production is through the use of molten iron smelted from vanadium-containing iron ore to obtain vanadium slag, and then oxidize the vanadium slag to form water-soluble sodium vanadate, then immerse vanadium in water to separate and obtain vanadium pentoxide . [0003] The theoretical basis of this method is to first reduce the vanad...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B34/22
CPCY02P10/20
Inventor 李宏宋文臣牛四通牛士珍郭洛方
Owner UNIV OF SCI & TECH BEIJING
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