Method and system for processing high-calcium and high-phosphorus vanadium slag

A high-calcium, high-phosphorus vanadium slag, phosphorus-vanadium technology, applied in the field of metallurgy, can solve the problems of high CaO content, unsuitable and unusable, etc.

Pending Publication Date: 2017-05-31
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high content of CaO in this high-calcium and high-phosphorus vanadium slag, CaO will interact with V during sodium roasting. 2 o 5 Formation of insoluble calcium vanadate CaO·V 2 o 5 or vanadium blue calcium CaV with calcium 12 o 30 , every 1% increase in the mass fraction of CaO will bring 4.7-9.0% of V 2 o 5 loss, so it is not suitable to use sodium roasting-water leaching vanadium extraction process; if calcification roasting-acid leaching vanadium extraction process is used, a large amount of calcium and phosphorus will enter the leachate along with vanadium, because there are a large number of calcium ions in the solution Existence, adjusting the pH of the solution between 9.511.0 will re-form calcium vanadate precipitation, so the traditional dephosphorization method under alkaline conditions cannot be used, and the dephosphorization problem under acidic systems has not yet been overcome
[0004] Therefore, the technology for dephosphorizing and extracting vanadium from high-calcium and high-phosphorus vanadium slag needs to be further developed

Method used

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  • Method and system for processing high-calcium and high-phosphorus vanadium slag
  • Method and system for processing high-calcium and high-phosphorus vanadium slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] The high-calcium and high-phosphorus vanadium slag (CaO content is 3% by weight, P 2 o 5 Content is 0.2% by weight, V 2 o 5 Fe content is 20% by weight, Fe content is 35% by weight), silica, reduced coal and bentonite are mixed at a mass ratio of 100:5:15:2 to obtain a mixed material, and the mixed material is molded on a high-pressure double-roller ball press to obtain a mixed ball group. The mixed pellets are reduced and roasted in the tunnel kiln at 1200°C. Phosphorus mainly enters the flue gas in the form of phosphorus vapor. After the reaction, dephosphorized metallized pellets are obtained. The metallization rate of the dephosphorized metallized pellets is 80. %. The dephosphorized metallized pellets are melted on an electric furnace at a temperature of 1500°C to obtain molten iron and low-phosphorus vanadium slag. The molten iron can be sent to steelmaking, and the P in low-phosphorus vanadium slag 2 o 5 The Fe content is 0.09% by weight, and the Fe content...

Embodiment 2

[0118] The high-calcium and high-phosphorus vanadium slag (CaO content is 25% by weight, P 2 o 5 Content is 1% by weight, V 2 o 5 content is 5% by weight, Fe content is 20% by weight), silica, reduced coal and starch solution are mixed at a mass ratio of 100:15:8:3 to obtain a mixed material. The mixed material is molded on a high-pressure double-roller briquetting machine to obtain a mixed pellet. The mixed pellets are reduced and roasted in the tunnel kiln at 1400°C. Phosphorus mainly enters the flue gas in the form of phosphorus vapor. After the reaction, dephosphorized metallized pellets are obtained. The metallization rate of the dephosphorized metallized pellets is 75. %. The dephosphorized metallized pellets are melted on an electric furnace at a temperature of 1550°C to obtain molten iron and low-phosphorus vanadium slag. The molten iron can be sent to steelmaking, and the P in low-phosphorus vanadium slag 2 o 5 The Fe content is 0.05% by weight, and the Fe conte...

Embodiment 3

[0120] The high-calcium and high-phosphorus vanadium slag (CaO content is 15% by weight, P 2 o 5 Content is 0.6% by weight, V 2 o 5 content is 7% by weight, Fe content is 30% by weight), silica, reduced coal and water glass are mixed according to the mass ratio of 100:10:10:4 to obtain a mixed material. The mixed material is molded on a high-pressure double-roller briquetting machine to obtain a mixed pellet. The mixed pellets are reduced and roasted in the tunnel kiln at 1300°C, phosphorus enters the flue gas mainly in the form of phosphorus vapor, and dephosphorized metallized pellets are obtained after the reaction. The metallization rate of the dephosphorized metallized pellets is 82 %. The dephosphorized metallized pellets are melted on an electric furnace at a temperature of 1600°C to obtain molten iron and low-phosphorus vanadium slag. The molten iron can be sent to steelmaking, and P in low-phosphorus vanadium slag 2 o 5 The Fe content is 0.04% by weight, and the...

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Abstract

The invention discloses a method and system for processing high-calcium and high-phosphorus vanadium slag. The method for processing the high-calcium and high-phosphorus vanadium slag comprises the following steps: mixing the high-calcium and high-phosphorus vanadium slag, silica, reducing coal and a binder, so as to obtain a mixed material; carrying out formation on the mixed material, so as to obtain mixed pellets; carrying out reducing roasting dephosphorization on the mixed pellets, so as to obtain dephosphorized metallized pellets and phosphorus-containing flue gas; carrying out melt separation on the dephosphorized and metallized pellets, so as to obtain molten iron and low-phosphorus vanadium slag; carrying out oxidation roasting with calcium on the low-phosphorus vanadium slag, so as to obtain acid-soluble calcium vanadate clinker; and carrying out acid leaching and vanadium extraction on the acid-soluble calcium vanadate clinker, so as to obtain a vanadium pentoxide product. By utilizing the method for processing the high-calcium and high-phosphorus vanadium slag, phosphorus in the high-calcium and high-phosphorus vanadium slag can be effectively removed, so that the recycling rates of iron and vanadium are remarkably increased, and the qualities of the iron and the vanadium are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular, the invention relates to a method and a system for treating high-calcium and high-phosphorus vanadium slag. Background technique [0002] Vanadium slag refers to a kind of slag that is rich in vanadium oxide and iron oxide after blowing and oxidation of vanadium-containing molten iron, and its main components are MFe, FeO, SiO 2 , V 2 o 3 、TiO 2 , CaO, Al 2 o 3 , MgO and Cr 2 o 3 . About 60% of the vanadium in the world is extracted from vanadium slag. The current method of extracting vanadium from vanadium slag is to mix it with additives and put it into a rotary kiln or multi-hearth furnace for oxidative roasting to obtain soluble vanadate. Wet leaching method transfers vanadium from solid phase to liquid phase and then precipitates vanadium, and calcines the product of vanadium precipitation to obtain V 2 o 5 product. Phosphorus is a harmful element in the precipit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B7/04C22B1/02
CPCC22B1/02C22B7/04C22B34/22Y02P10/20
Inventor 宋文臣王静静李红科曹志成汪勤亚吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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