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

A method for smelting vanadium-titanium magnetite by using oxygen-enriched top-blown smelting reduction

A vanadium titanomagnetite and oxygen-enriched top blowing technology is applied in the field of smelting vanadium titanomagnetite, which can solve the problems of poor slag desulfurization ability, more slag hanging in slag-iron grooves, serious foam slag, etc. Low environmental pollution and high productivity

Active Publication Date: 2016-05-25
KUNMING UNIV OF SCI & TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems in the prior art such as severe foamy slag, thick slag, sticky molten iron, too much slag hanging in the slag-iron ditch, poor slag desulfurization ability, etc., the present invention provides a method for smelting vanadium-titanium magnets by using oxygen-enriched top-blown smelting reduction The method of mine is realized by the following technical scheme

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for smelting vanadium-titanium magnetite by using oxygen-enriched top-blown smelting reduction
  • A method for smelting vanadium-titanium magnetite by using oxygen-enriched top-blown smelting reduction
  • A method for smelting vanadium-titanium magnetite by using oxygen-enriched top-blown smelting reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Separately crush the charge vanadium-titanium magnetite, dolomite, lime and non-coking coal to a particle size of 10mm. According to the above calculation formula, the basicity R is 0.7 and the internal carbon ratio C / O is 1.1. Take the crushed charge Mix well, and preheat to 300°C, and then spray into the smelting reduction furnace; and at the same time, inject the oxygen-enriched with a mass concentration of 99% into the furnace at a flow rate of 250L / h, and use the oxygen-enriched top-blown method at 1500 Smelting at ℃ for 20 minutes to obtain molten iron and slag; mixing slag and sodium chloride at a mass ratio of 2:1, roasting at 900℃ for 26 minutes, and then water leaching and acid leaching. Break with sodium titanate, add water according to the solid-liquid ratio of 1:1, then add concentrated sulfuric acid according to 20% of the mass of water, and finally stir at 90°C for 3 hours at a stirring speed of 1000r / min to make the Vanadium and titanium are converted in...

Embodiment 2

[0098] Separately crush the charge vanadium-titanium magnetite, dolomite, lime and non-coking coal to a particle size of 9 mm. According to the above calculation formula, the basicity R is 0.9 and the internal carbon ratio C / O is 1.3. Take the crushed charge respectively Mix well, and preheat to 350°C, and then spray into the smelting reduction furnace; at the same time, inject the oxygen-enriched with a mass concentration of 99% into the furnace at a flow rate of 250L / h, and use the oxygen-enriched top-blown method at 1450 Smelting at ℃ for 25 minutes to obtain molten iron and slag; mixing slag and sodium nitrate at a mass ratio of 1:1, roasting at 850℃ for 25 minutes, and then water leaching and acid leaching. Firstly, sodium vanadate and Sodium titanate is crushed, and water is added according to the solid-liquid ratio of 2:1, then concentrated sulfuric acid is added according to 30% of the mass of water, and finally stirred at 85°C for 2 hours at a stirring speed of 50r / min...

Embodiment 3

[0100] Separately crush the charge vanadium-titanium magnetite, dolomite, lime and non-coking coal to a particle size of 8mm. According to the above calculation formula, the basicity R is 1.5 and the internal carbon ratio C / O is 0.8. Take the crushed charge respectively Mix well, and preheat to 400°C, and then spray into the smelting reduction furnace; at the same time, inject the oxygen-enriched with a mass concentration of 99% into the furnace at a flow rate of 250L / h, and use the oxygen-enriched top-blown method at 1550 Smelting at ℃ for 30 minutes to obtain molten iron and slag; mixing slag and sodium carbonate at a mass ratio of 2:1, roasting at 800℃ for 30 minutes, and then water leaching and acid leaching. Firstly, sodium vanadate and Sodium titanate is crushed, and water is added according to the solid-liquid ratio of 2:1, then concentrated sulfuric acid is added according to 40% of the mass of water, and finally stirred at 80°C with a stirring speed of 2000r / min for 2....

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

No PUM Login to View More

Abstract

The invention provides a method of smelting vanadium titanomagnetite by using oxygen-enriched top-blown smelting reduction. According to the invention, the furnace charges of vanadium titanomagnetite, dolomite, lime and non-coking coal are crushed respectively, evenly mixed, preheated and then blown into a smelting reduction furnace; melting is carried out simultaneously in an oxygen-enriched top-blown way so as to obtain molten iron and slag; the slag and sodium salt are roasted together so as to enable vanadium and titanium in the slag to converted into sodium vanadate and sodium titanate, the slag is immersed with water at first and acid next, then filtration is carried out to separate sodium vanadate from sodium titanate, and finally vanadium and titanium are respectively recovered from sodium vanadate and sodium titanate by using conventional methods. The method provided in the invention overcomes the shortcomings of high energy consumption, great pollution and low thermal efficiency in blast furnace ironmaking processes and problems in blast furnace smelting of high reserve vanadium titanomagnetite in China, directly uses non-coking coal and ore fines and gets rid of dependence on coking and agglomeration, thereby shortening process flow, reducing investment on equipment and broadening the utilization scope of original fuels; the advantages of small environmental pollution, a fast reaction speed and high productivity are achieved.

Description

technical field [0001] The invention relates to a method for smelting vanadium-titanium magnetite by using non-coking coal powder as a reducing agent under oxygen-enriched top-blown smelting reduction conditions, and belongs to the technical field of energy and metallurgy. Background technique [0002] In the Panxi area of ​​my country, vanadium-titanium magnetite resources are extremely rich, and the proven reserves are more than 8 billion tons. It is a composite ore with great comprehensive utilization value. Over the past twenty years, my country has accumulated rich experience in blast furnace smelting vanadium-titanium magnetite and solved many technical difficulties. At present, the Panzhihua Iron and Steel Blast Furnace makes the TiO in the slag 2 Reduced to less than 25%, in order to achieve the smooth flow of the blast furnace and obtain better technical and economic indicators. However, so far, the normal smelting of all vanadium and titanium has not been realize...

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
IPC IPC(8): C21B11/00
Inventor 王华李慧斌郈亚丽卿山李虎李幼灵张竹明杨雪峰
Owner KUNMING UNIV OF SCI & TECH