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Method for comprehensively utilizing vanadium slag

A technology of vanadium slag and calcium vanadate, which is applied in the direction of improving process efficiency, etc., to achieve the effects of simple operation, easy realization, and improved recovery rate

Active Publication Date: 2016-08-31
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The hot spot in the study of vanadium extraction from vanadium slag is how to increase the recovery rate of vanadium, but there are few reports on the recovery of iron in vanadium slag

Method used

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  • Method for comprehensively utilizing vanadium slag
  • Method for comprehensively utilizing vanadium slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Vanadium slag (containing 35% of total iron, 16% of vanadium pentoxide), calcium oxide (99.8% of CaO mass content), reduced coal (78% of fixed carbon content) and vanadium Slag: Calcium Oxide: Reduced Coal = 100:10:6 for batching and mixing, the mixture is added to the rotary hearth furnace for direct reduction smelting, the smelting temperature is 1300°C, and the smelting time is 45 minutes to obtain metallized pellets (metallization rate 85%) , the metallized pellets are ground and magnetically separated to obtain reduced iron powder (full iron grade 95%) and vanadium-rich slag, and the reduced iron powder can be used as steelmaking raw material. Then the vanadium-rich slag is directly oxidized and roasted in the rotary kiln, the roasting temperature is 800°C, and the roasting time is 1.5 hours, to obtain calcium vanadate clinker, the vanadium recovery rate is 98%, and finally the vanadic acid is processed by the mature wet vanadium extraction process Calcium clinker ...

Embodiment 2

[0051] Vanadium slag (containing 42% of total iron, 20% of vanadium pentoxide), calcium carbonate (55.4% of CaO mass content), blue carbon (82% of fixed carbon content) and vanadium Slag: calcium carbonate: semi-coke = 100:30:9 for batching and mixing, the mixture is added to the car bottom furnace for direct reduction smelting, the smelting temperature is 1200°C, and the smelting time is 1h to obtain metallized pellets (metallization rate 88%) , the metallized pellets are ground and magnetically separated to obtain reduced iron powder (full iron grade 93.5%) and vanadium-rich slag, and the reduced iron powder can be used as steelmaking raw material. Then the vanadium-rich slag is directly oxidized and roasted in a rotary hearth furnace at a roasting temperature of 900°C and roasting time of 2 hours to obtain calcium vanadate clinker with a vanadium recovery rate of 95%. Finally, vanadic acid is treated by a mature wet vanadium extraction process Calcium clinker to get vanadiu...

Embodiment 3

[0053] Vanadium slag (containing 25% of total iron, 14% of vanadium pentoxide), calcium hydroxide (CaO mass content of 73%), coke (fixed carbon content of 86%), vanadium Slag: Calcium Hydroxide: Coke = 100:21:12 for batching and mixing, the mixture is added to the tunnel kiln for direct reduction smelting, the smelting temperature is 1150°C, and the smelting time is 1.5h to obtain metallized pellets (metallization rate 83%) , the metallized pellets are ground and magnetically separated to obtain reduced iron powder (full iron grade 90.8%) and vanadium-rich slag, and the reduced iron powder can be used as steelmaking raw material. Then the vanadium-rich slag is directly oxidized and roasted in the rotary kiln, the roasting temperature is 750°C, and the roasting time is 1h, to obtain calcium vanadate clinker, the vanadium recovery rate is 96%, and finally the mature wet vanadium extraction process is used to process the calcium vanadate Clinker to get vanadium pentoxide product....

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Abstract

The invention provides a method for comprehensively utilizing vanadium slag. The method comprises the following steps: mixing the vanadium slag, calcium salt and a reducing agent to obtain a mixed material; directly reducing and smelting the mixed material to obtain a metallized pellet; performing grinding and magnetic separation for the metallized pellet to obtain reduced iron powder and vanadium-rich slag; performing oxidizing roasting for the vanadium-rich slag to obtain a calcium vanadate clinker; extracting vanadium from the calcium vanadate clinker to obtain vanadium pentoxide. With the adoption of the method, an iron resource in the vanadium slag can be recovered; the iron is recovered by calcifying, reducing and magnetic separation, and then the vanadium-rich slag is directly oxidized and roasted to obtain a high-valence calcium vanadate clinker; vanadium pentoxide can be produced by a currently-mature acid leaching-vanadium precipitating-roasting process.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal extraction, in particular to a method for comprehensively utilizing vanadium slag. Background technique [0002] Vanadium has good plasticity and can be rolled into sheets, foils and drawn wires at room temperature, and has elasticity and ductility at a certain temperature. A small amount of intergranular impurities, especially elements such as C, O, N and H, will increase its hardness and brittleness, but decrease its ductility. Vanadium has high impact value, good weldability and heat transfer, and has good corrosion resistance to seawater, alkaline solution, organic acid and inorganic acid. It can be used as structural material and chemical container of ship, seamless thin film Materials for wall pipes, etc. [0003] About 60% of the vanadium in the world is extracted from vanadium slag. Vanadium slag refers to a kind of slag that is rich in vanadium oxide and iron oxide after blowi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B34/22C22B1/02C21B13/00
CPCC21B13/0046C22B1/02C22B7/001C22B7/04C22B34/22Y02P10/20
Inventor 宋文臣王静静李红科曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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