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Vanadium extraction technology of low-grade high-calcium vanadium-containing steel slag

A low-grade, steel slag technology, applied in the field of metallurgy and chemical industry, can solve problems such as difficult extraction of vanadium, and achieve the effect of avoiding interference and influence

Inactive Publication Date: 2012-07-04
SICHUAN DAZHOU IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides a process for extracting vanadium from low-grade high-calcium vanadium-containing steel slag, which solves the problem that vanadium in low-grade high-calcium vanadium-containing steel slag is not easy to extract, and makes the vanadium resources in vanadium-titanium magnetite obtained Effective recycling and utilization

Method used

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  • Vanadium extraction technology of low-grade high-calcium vanadium-containing steel slag
  • Vanadium extraction technology of low-grade high-calcium vanadium-containing steel slag

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Experimental program
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Embodiment 1

[0027] S1-1. Obtaining steel slag: direct steelmaking with vanadium-containing molten iron, and vanadium will enter the steel slag during the steelmaking process to obtain low-grade, high-calcium, vanadium-containing steel slag. The low-grade high-calcium vanadium-containing steel slag is first crushed by jaw crusher, and lime is added according to the CaO mass ratio of 7%±1%, and the mixed material is mixed and ground to -200 mesh±10 mesh. The vanadium slag is obtained after iron removal by magnetic separation. The metal iron contained in the vanadium slag is less than 5%, mainly to prevent the iron from exothermic and causing the charge to stick in the subsequent roasting process. Finally, the vanadium slag is granulated, and the particle size is 10mm±1mm.

[0028] S1-2, carry out calcification roasting on the granular vanadium slag in S1-1, the roasting temperature in the rotary kiln is 950℃±50℃, and the duration is 2-3h. Through roasting, the vanadium in the vanadium slag...

Embodiment 2

[0034] S2-1. Use vanadium-containing molten iron to directly make steel. During the steelmaking process, vanadium will enter the steel slag to obtain low-grade and high-calcium vanadium-containing steel slag, so as to realize the pretreatment of the steel slag. The low-grade and high-calcium vanadium-containing steel slag is first crushed by jaw type, and lime is added according to the CaO with a mass ratio of 7%, and the mixed material is mixed and ground to -200 mesh. The vanadium slag is obtained after iron removal by magnetic separation. The metal iron contained in the vanadium slag is less than 5%, mainly to prevent the iron from exothermic and causing the charge to stick in the subsequent roasting process. Finally, the vanadium slag is granulated, and the particle size is 10 mm.

[0035] S2-2, carry out calcification roasting on the granular vanadium slag in S2-1, the roasting temperature in the rotary kiln is 950℃, and the duration is 2.5h. Through roasting, the vanadi...

Embodiment 3

[0041] The process steps of this embodiment and the first embodiment are the same, and the difference lies in the parameters required for each step, which are as follows:

[0042] S3-1. Add lime according to the mass ratio of lime to low-grade high-calcium vanadium-containing steel slag as 6%, and mix and grind the mixture to -210 mesh; the obtained vanadium slag is granulated, and the particle size is 9 mm;

[0043] S3-2, the vanadium slag is subjected to calcification roasting at a temperature of 900°C and a duration of 2h;

[0044] S3-3, Ca(VO 3 ) 2 Mix with 5% ammonium bicarbonate aqueous solution according to the ratio of liquid to solid ratio of 1.8:1;

[0045] S3-4, hydrolyze vanadium precipitation at 95℃ for 1.5h;

[0046] S3-5, the same as S1-5;

[0047] S3-6, NH 4 Cl:V 2 O 5 =1.8:1, precipitation at room temperature for 11.5h; the obtained NH 4 VO 3 Deamination at 500°C.

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Abstract

The invention discloses a vanadium extraction technology of low-grade high-calcium vanadium-containing steel slag. The technology comprises the following steps of: a, performing pretreatment of the low-grade high-calcium vanadium-containing steel slag; b, performing oxidation calcification roasting of the low-grade high-calcium vanadium-containing steel slag; c, performing carbonation leaching treatment of the vanadium-containing steel slag after the roasting to obtain vanadium-containing leachate; d, adding an acid to the vanadium-containing leachate to precipitate vanadium, and filtering to obtain coarse vanadium; e, performing alkaline solution treatment of the coarse vanadium, and filtering to obtain V<5+>-containing filtrate; and f, adding NH4Cl into the V<5+>-containing filtrate, reacting to generate NH4VO3, and performing deamination to obtain V2O5 finally. Through the vanadium extraction technology disclosed by the invention, the requirement on calcium content is reduced; high-purity vanadium pentoxide is produced from low-grade high-calcium vanadium-containing steel slag; and the vanadium resource in the vanadium-titanium magnetite is effectively recycled and utilized. The invention provides conditions for the vanadium extraction of a converter single-link method; and the vanadium-containing molten iron is directly used for steelmaking, the vanadium enters the low-grade high-calcium steel slag, and an additional converter for vanadium extraction is not needed, thereby avoiding the interference and influence on the steelmaking caused by the additional vanadium extraction converter for vanadium extraction.

Description

technical field [0001] The invention relates to the technical field of metallurgy and chemical industry, in particular to a vanadium extraction process from low-grade and high-calcium vanadium-containing steel slag. Background technique [0002] As an important metal, vanadium has been widely used in special steel, low alloyed and microalloyed steel, and has obvious technical and economic advantages. At the same time, with the rapid development of economy and technology, vanadium also has broad application prospects in the fields of automobile, aerospace, railway, electronic technology, national defense industry, etc. Therefore, the low-cost production technology of vanadium has become the main research topic of many scientific research institutions. Vanadium is mainly derived from vanadium titanomagnetite. [0003] Vanadium titanomagnetite accounts for a large proportion of vanadium-containing resources. The main method for recovering vanadium from vanadium titanomagnetite...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B34/22
CPCY02P10/20
Inventor 王皎月张琦龚波袁见喻春亮杨海波宋龙江
Owner SICHUAN DAZHOU IRON & STEEL GROUP
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