Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for smelting vanadium-rich pig iron from vanadium-containing steel slag and vanadium extraction tailings

A technology for extracting vanadium tailings and steel slag is applied in the field of vanadium-containing steel slag and vanadium-extracting tailings for smelting vanadium-rich pig iron, which can solve the problems of high phosphorus content, use and environmental pollution of vanadium-rich pig iron, and achieves high vanadium extraction rate and equipment. Simple, high dephosphorization effect

Inactive Publication Date: 2021-08-10
NORTHEASTERN UNIV
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the grade of vanadium-containing steel slag is not high, it is still an important vanadium resource, and the vanadium compound is toxic, and if it is not treated, it will pollute the environment.
[0003] For this reason, existing enterprises generally use sodium salt roasting and acid leaching method to extract vanadium from vanadium-containing steel slag, but this method will produce a large amount of acid leaching vanadium extraction tailings, and the stockpiling and treatment of vanadium extraction tailings is also an urgent problem. question
At present, there is a method for extracting vanadium from vanadium-containing steel slag and vanadium-extracting tailings. This method uses vanadium-containing steel slag and vanadium-extracting tailings as raw materials, adds oil shale slag solvent, and submerged arc smelting in a low-profile submerged arc furnace. , and use a low-grade carbonaceous reducing agent to separate the slag and molten iron, and obtain vanadium-rich pig iron after cooling; The use of raw materials for industrial production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The vanadium-containing steel slag used in this example is slag obtained by smelting vanadium-containing molten iron in a converter, and its chemical composition is shown in Table 1. The vanadium-extracting tailings used in this example are the tailings produced after the vanadium-containing steel slag is subjected to high-temperature sodium roasting process to extract vanadium, and its chemical composition is shown in Table 2.

[0039] The chemical composition (wt%) of table 1 vanadium-containing steel slag

[0040] TF V P CaO SiO 2

MgO Al 2 o 3

TiO 2

mn 17.90 1.09 1.77 44.22 10.58 10.62 2.18 0.68 0.81

[0041] The chemical composition (wt%) of vanadium tailings in table 2

[0042] Fe mn Na TiO 2

SiO 2

Al 2 o 3

Cr 2 o 3

P V MgO CaO 30.81 6.39 3.02 7.04 15.95 2.81 7.01 0.067 0.98 1.784 4.2

[0043] The method for smelting vanadium-rich pig iron with v...

Embodiment 2

[0050] The chemical composition of vanadium-containing steel slag and vanadium extraction tailings used in this example is the same as that in Example 1.

[0051] The method for smelting vanadium-rich pig iron with vanadium-containing steel slag and vanadium-extracting tailings provided in this embodiment comprises the following steps:

[0052] Step S1, crushing vanadium-containing steel slag, vanadium extraction tailings and coke (fixed carbon content greater than 75%), grinding into particles with a particle size of 5mm, and mixing with silica (silicon dioxide content greater than 95%, particle size less than 5mm) Mix well together to get a mix. The composition ratio of the mixture is 100 parts of vanadium-containing steel slag, 100 parts of vanadium extraction tailings, 20 parts of coke, and 13 parts of silica.

[0053] Step S2, adding the mixture into the preheated electric arc furnace in 3 batches, and performing reduction arc smelting; wherein, the temperature of reduct...

Embodiment 3

[0058] The chemical composition of vanadium-containing steel slag and vanadium extraction tailings used in this example is the same as that in Example 1.

[0059] The method for smelting vanadium-rich pig iron with vanadium-containing steel slag and vanadium-extracting tailings provided in this embodiment comprises the following steps:

[0060] Step S1, crushing vanadium-containing steel slag, vanadium extraction tailings and coke (fixed carbon content greater than 75%), grinding into particles with a particle size of 5mm, and mixing with silica (silicon dioxide content greater than 95%, particle size less than 5mm) Mix well together to get a mix. The composition ratio of the mixture is 100 parts of vanadium-containing steel slag, 30 parts of vanadium extraction tailings, 8 parts of coke, and 15 parts of silica.

[0061] Step S2, adding the mixture into the preheated electric arc furnace in 3 batches, and performing reduction arc melting; wherein, the temperature of reduction...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a method for smelting vanadium-rich pig iron from vanadium-containing steel slag and vanadium-extracted tailings. The method comprises the following steps that step S1, the vanadium-containing steel slag, the vanadium-extracted tailings, a carbonaceous reducing agent and silica are uniformly mixed to obtain a mixture; S2, the mixture is added into a preheated electric arc furnace in batches, reduction electric arc melting is carried out, after reduction electric arc melting is completed, a reduction dephosphorization agent accounting for 5%-10% of the mass of the vanadium-containing steel slag is added into the electric arc furnace, and a dephosphorization reaction is carried out; and S3, after the dephosphorization reaction is finished, vanadium-containing molten iron is discharged from an iron outlet of the electric arc furnace, and the vanadium-rich pig iron is obtained after the vanadium-containing molten iron is cooled. The vanadium-rich pig iron with low phosphorus content can be smelted.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of metallurgical slag, in particular to a method for smelting vanadium-rich pig iron with vanadium-containing steel slag and vanadium-extracted tailings. Background technique [0002] To recover vanadium from vanadium-titanium magnetite, the common method is to smelt vanadium-titanium magnetite in a blast furnace to produce vanadium-containing molten iron, and then oxidize the vanadium through selective oxidation of molten iron to enter the slag, and finally obtain vanadium-containing molten iron with a higher content. Steel slag. Although the grade of vanadium-containing steel slag is not high, it is still an important vanadium resource, and vanadium compounds are toxic, and if not treated, it will pollute the environment, and the stockpiling of vanadium-containing steel slag will also occupy a large amount of land. [0003] For this reason, existing enterprises generally use s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/12C21C1/02C22B7/04C22B34/22
CPCC21B13/0006C21B13/0066C21B13/12C21C1/02C22B7/001C22B7/04C22B34/22Y02P10/20
Inventor 陈建设许健刘奎仁韩庆孙树臣李斌川
Owner NORTHEASTERN UNIV