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Method for totally extracting vanadium, gallium and scandium by using titanium dioxide hydrolysis waste acid to leach steel slag containing vanadium

A technology of acid leaching and white water, applied in the direction of improving process efficiency, to achieve the effect of low production cost, great social and economic benefits, and saving processing cost

Inactive Publication Date: 2011-04-13
杨秋良 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no technology in the prior art to extract and separate vanadium, gallium and scandium in the acid leaching solution by leaching vanadium-containing steel slag with titanium dioxide hydrolysis waste acid and adopting the total extraction method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) First at 45M 3 Add 28 tons of titanium white hydrolyzed waste acid into the pickling tank welded by stainless steel. The total acid volume percentage of the titanium white hydrolyzed waste acid is 38.79%, free acid is 25.93%, ferrous iron is 50.60g / L, ferric iron is 0.46g / L, gallium 1.91g / L, scandium 2.28g / L. The vanadium-containing steel slag (Panzhihua Iron and Steel (Group) Company) containing vanadium 1.061% by mass percentage, containing 34.5g / ton of gallium, and 19.8g / ton of scandium is passed through ball milling -100 mesh accounts for the vanadium-containing steel slag edge of 75.35% by mass percentage The ball mill is conveyed by belt conveyor to the acid leaching tank to which the waste acid of titanium dioxide hydrolysis has been added, while adding, it is stirred by air pump until the vanadium-containing steel slag turns white, and the feeding is stopped when the pH value is 2.01. A total of 14.5 tons of vanadium-containing steel slag was used each time...

Embodiment 2

[0047] (1) First at 45M 3 Add 28 tons of titanium white hydrolyzed waste acid into the pickling tank welded by stainless steel. The total acid volume percentage of the titanium white hydrolyzed waste acid is 38.79%, free acid is 25.93%, ferrous iron is 50.60g / L, ferric iron is 0.46g / L, gallium 1.91g / L, scandium 2.28g / L. Vanadium-containing steel slag (Panzhihua Iron and Steel (Group) Company) containing vanadium 1.061% by mass percentage, containing gallium 34.5g / ton, scandium 19.8g / ton through ball milling -100 mesh accounts for the vanadium-containing steel slag edge of mass percentage 85.35% The ball mill is transported by belt conveyor to the acid leaching tank to which the waste acid of titanium dioxide hydrolysis has been added, while adding, it is stirred by air pump until the vanadium-containing steel slag turns white, and the feeding is stopped when the pH value is 2.15. A total of 13.2 tons of vanadium-containing steel slag is used each time, and each ton of vanadiu...

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Abstract

The invention relates to a method for extracting, separating and recovering vanadium, gallium and scandium in pickle liquor by adopting a total extracting method and using titanium dioxide hydrolysis waste acid to leach steel slag containing vanadium, comprising the following steps of: mixing and stirring titanium dioxide hydrolysis waste acid and steel slag containing vanadium to obtain leaching pulp; performing solid-liquid separation for the leaching pulp, totally extracting vanadium, gallium and scandium in filtered liquor with five-category return flow, then back-extracting vanadium and gallium with five-category return flow, neutralizing with ammonium bicarbonate or ammonia water, warning up, precipitating vanadium to obtain ammonium polyvanadate, repeatedly back-extracting and precipitating vanadium for precipitating-vanadium mother liquor, and then recovering gallium; and when a back-extracting vanadium and gallium organic phase is repeatedly totally extracted and back-extracted till the content of scandium in the back-extracting vanadium and gallium organic phase is 50-1000mg, recovering scandium. The invention has the beneficial effects that waste is treated with waste, namely vanadium, gallium and scandium are recovered by using titanium dioxide hydrolysis waste acid to leach steel slag containing vanadium, and the sulfuric acid cost is saved; the method has great social and economic benefits and low production cost for producing gallium and scandium; without roasting, no waste gas is produced, and three wastes can be discharged with corresponding standards.

Description

technical field [0001] The invention belongs to the field of wet chemical metallurgy, and specifically relates to a method for leaching vanadium-containing steel slag with titanium dioxide hydrolysis waste acid and adopting a total extraction method to extract, separate and recover vanadium, gallium and scandium in the acid leaching solution. Background technique [0002] In the process of steelmaking, Panzhihua Iron and Steel produces more than 300,000 tons of vanadium-containing steel slag every year. The steel slag contains 1.007-2.040% vanadium, 30-70 grams / ton gallium, 6-30 grams / ton scandium, and 34-45 grams calcium oxide. %, using acid leaching process to extract vanadium, the consumption of sulfuric acid is as high as 480-620kg / ton. Production costs are high and economically unfeasible. Chengdu University of Science and Technology proposed sodium roasting-carbonation leaching for the extraction of vanadium from steel slag. Due to the harsh process conditions, large ...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B3/08C22B3/38C22B34/22C22B58/00C22B59/00
CPCY02P10/20
Inventor 杨秋良
Owner 杨秋良
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