CN102690944A - Method for comprehensively recovering vanadium, titanium and iron from high-vanadium vanadium titano-magnetite - Google Patents

Method for comprehensively recovering vanadium, titanium and iron from high-vanadium vanadium titano-magnetite Download PDF

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CN102690944A
CN102690944A CN2012102100433A CN201210210043A CN102690944A CN 102690944 A CN102690944 A CN 102690944A CN 2012102100433 A CN2012102100433 A CN 2012102100433A CN 201210210043 A CN201210210043 A CN 201210210043A CN 102690944 A CN102690944 A CN 102690944A
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vanadium
titanium
magnetite
slag
titano
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吴道洪
王敏
曹志成
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Beijing Shenwu Environmental and Energy Technology Co Ltd
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Abstract

The invention discloses a method for comprehensively recovering vanadium, titanium and iron from high-vanadium vanadium titano-magnetite. The method comprises the steps of: firstly, adding either sodium salt or calcium salt into the high-vanadium vanadium titano-magnetite, roasting by using a rotary hearth furnace, then performing acid leaching, separating lixivium from residues, and preparing a vanadium product from the lixivium; then blending a carbon-containing reducing agent into the leached residues to prepare reducible pellets, drying the pellets, rapidly reducing the pellets in the rotary hearth furnace, and melting and separating reduzates in a gas melting furnace or an electric furnace to separate out vanadium-containing molten iron and titanium slag, and preparing titanium dioxide from the titanium slag; and then, carrying out oxygen blowing on the separated vanadium-containing molten iron through a converter to extract vanadium so as to separate out vanadium slag and pig iron, crushing the vanadium slag, returning the crushed vanadium slag back to be mixed with the high-vanadium vanadium titano-magnetite, roasting and carrying out acid leaching to extract vanadium. The method has the advantages of high yield and high purity of vanadium, titanium and iron.

Description

The comprehensive method that reclaims vanadium, titanium, iron in the high vanadium vanadium titano-magnetite
Technical field
The present invention relates to a kind of smelting process of vanadium titano-magnetite, relate in particular to the method for vanadium, titanium, iron in the high vanadium vanadium titano-magnetite of a kind of comprehensive recovery.
Background technology
Explored in the world vanadium resource reserves have 98% symbiosis in vanadium titano-magnetite, mainly are distributed in states such as the C.I.S., the U.S., South Africa, China, Norway.China accounts for 11% of world's vanadium reserves, and the vanadium resource of China mainly concentrates on Flos Bombacis Malabarici and area, Chengde.World's titanium resource is main with ilmenite, and ilmenite accounts for 90% of world's titanium resource total amount.China accounts for 38.85% of world's vanadium reserves, and Chinese titanium resource mainly concentrates on Panzhihua Region.
At present, the industrial treatment technology of the vanadium titano-magnetite of Panzhihua Region is the blast-furnace smelting method of " v-ti magnetite concentrate+common iron ore concentrate ".At traditional blast-furnace smelting---in the vanadium extraction by converter blowing technology, the titanium oxide in the v-ti magnetite concentrate gets into blast furnace slag in blast furnace ironmaking process, causes the titanium oxide can't effective recycling;---after the operations such as vanadium extraction by converter blowing---sodium roasting---water logging vanadium extraction, the total yield of vanadium resource is merely about 51% vanadium in the v-ti magnetite concentrate through blast furnace ironmaking.In the comprehensive utilization of v-ti magnetite concentrate, about 49% vanadium resource and most titanium resource do not obtain effective and reasonable utilization.
At present, from the vanadium titano-magnetite of high content of vanadium, effectively separate and extract the technological not perfect of vanadium, titanium, iron, extraction vanadium and titanium from vanadium titano-magnetite cost-effectively.
Mainly contain following several kinds of schemes in the prior art:
The technical scheme of prior art one:
The method of separation and Extraction metallic element from vanadium titano-magnetite (patent No. 200210050117.7) has been introduced a kind of employing rotary hearth furnace fast restore---and the molten method of dividing of electric furnace obtains molten iron and the technology that contains molten minute slag of vanadium titanium.
The shortcoming of prior art one:
This technology is not studied extraction vanadium and titanium from the molten minute slag that contains vanadium, titanium.
The technical scheme of prior art two:
------water logging vanadium extraction---rotary kiln---electric furnace melts division technique to high temperature oxidation sodium sodium roasting to have introduced vanadium titano-magnetite in complex ore comprehensive utilization (Wang Wenzhong chief editor, P107-109, press of Northeastern University, 1994).
The shortcoming of prior art two:
In this technology, vanadium, titanium comprehensive recovery are lower, are respectively 58% and 74%; Vanadium extraction pelletizing residue produces a large amount of powder in the rotary kiln reduction process, cause ring formation of rotary kiln serious, and what influence was produced carries out smoothly; The rotary kiln reduction rate is slow, and the cycle is longer.
The technical scheme of prior art three:
The method of iron, vanadium, titanium in a kind of comprehensive recovery v-ti magnetite concentrate (Chinese patent number 200710202813.9) has been introduced v-ti magnetite concentrate---sodium roasting---water logging vanadium extraction, the molten technology that makes molten iron and titanium slag of dividing of roasting residue---rotary hearth furnace directly reduces---electric furnace.
These technology concrete steps are following:
A) vanadium titano-magnetite adds sodium salt, and sodium salt is a SODIUM SULPHATE ANHYDROUS 99PCT, and consumption is 5%~9% of a raw ore weight, and water leaches after the roasting, and roasting time is 25~60min, and maturing temperature is 1200~1300 ℃, isolates immersion liquid and residue, and leach liquor makes the vanadium product;
B) residue is made ball after adding hard coal, wilkinite mixing after the water logging, oven dry back fast restore in rotary hearth furnace, hard coal consumption 18~22%, bentonite consumption 1.8~2.2%, 1250~1450 ℃ of reduction temperatures, recovery time 25~35min.
The shortcoming of prior art three:
A) in this technology, vanadium recovery has only 80%, has 20% vanadium to get in molten iron and the titanium slag, and vanadium still has partly and is not fully utilized in the high vanadium schreyerite;
B) during the high content of vanadium vanadium titano-magnetite of this art breading, because content of vanadium is high, it is also higher relatively to get in the titanium slag content of vanadium, finally influences the quality of white titanium pigment.
Summary of the invention
The method that the purpose of this invention is to provide vanadium, titanium, iron in the high vanadium vanadium titano-magnetite of comprehensive recovery that a kind of vanadium, titanium, iron recovery are high, purity is high.
The objective of the invention is to realize through following technical scheme:
The method of vanadium, titanium, iron in the high vanadium vanadium titano-magnetite of comprehensive recovery of the present invention may further comprise the steps:
A, in high vanadium vanadium titano-magnetite, add in sodium salt or the calcium salt any, with going out with acidleach after the rotary hearth furnace roasting, separation leach liquor and residue, leach liquor makes the vanadium product;
Allocate carbon in B, the residue in steps A, process the reductibility pelletizing, the fusing in combustion gas molten branch stove or electric furnace of pelletizing oven dry back fast restore in rotary hearth furnace, reduzate separates, and isolates vanadium-bearing hot metal and titanium slag, and titanium slag is processed white titanium pigment;
Isolated vanadium-bearing hot metal is isolated the vanadium slag and the pig iron through the Converter Oxigen Blowing vanadium extraction among C, the step B, turns back to after the vanadium slag fragmentation in the steps A with high vanadium vanadium titano-magnetite to carry out roasting, acid-leaching vanadium-extracted behind the batch mixing together.
Technical scheme by the invention described above provides can be found out; The method of vanadium, titanium, iron in the high vanadium vanadium titano-magnetite of comprehensive recovery provided by the invention; Owing at first in high vanadium vanadium titano-magnetite, add in sodium salt or the calcium salt any; With going out with acidleach after the rotary hearth furnace roasting, separate leach liquor and residue, leach liquor makes the vanadium product; In the residue that leaches, allocate carbon into then, process the reductibility pelletizing, the fusing in combustion gas molten branch stove or electric furnace of pelletizing oven dry back fast restore in rotary hearth furnace, reduzate separates, and isolates vanadium-bearing hot metal and titanium slag, and titanium slag is processed white titanium pigment; Again with isolated vanadium-bearing hot metal through the Converter Oxigen Blowing vanadium extraction, isolate the vanadium slag and the pig iron, return after the vanadium slag fragmentation with high vanadium vanadium titano-magnetite and carry out roasting, acid-leaching vanadium-extracted behind the batch mixing together.Can solve current existing technical process and can not effectively extract vanadium, titanium, the not high problem of vanadium, titanium, iron recovery high content of vanadium vanadium titano-magnetite; It is big to solve in the high content of vanadium vanadium titano-magnetite in the titanium slag vanadiumcontent, can not satisfy the problem of producing qualified white titanium pigment requirement; The residue that can solve after acid-leaching vanadium-extracted is joined carbon, the problem that pellet strength is not high.
Description of drawings
The schematic flow sheet of the method for vanadium, titanium, iron in the high vanadium vanadium titano-magnetite of comprehensive recovery that Fig. 1 provides for the embodiment of the invention.
Embodiment
To combine accompanying drawing that the embodiment of the invention is done to describe in detail further below.
The method of vanadium, titanium, iron in the high vanadium vanadium titano-magnetite of comprehensive recovery of the present invention, its preferable embodiment is as shown in Figure 1:
May further comprise the steps:
A, in high vanadium vanadium titano-magnetite, add in sodium salt or the calcium salt any, with going out with acidleach after the rotary hearth furnace roasting, separation leach liquor and residue, leach liquor makes the vanadium product;
Allocate carbon in B, the residue in steps A, process the reductibility pelletizing, the fusing in combustion gas molten branch stove or electric furnace of pelletizing oven dry back fast restore in rotary hearth furnace, reduzate separates, and isolates vanadium-bearing hot metal and titanium slag, and titanium slag is processed white titanium pigment;
Isolated vanadium-bearing hot metal is isolated the vanadium slag and the pig iron through the Converter Oxigen Blowing vanadium extraction among C, the step B, turns back to after the vanadium slag fragmentation in the steps A with high vanadium vanadium titano-magnetite to carry out roasting, acid-leaching vanadium-extracted behind the batch mixing together.
The weight content of the vanadium of high vanadium vanadium titano-magnetite is between 0.8%~3% in the said steps A; Being crushed to 200 orders accounts for 80% back and adds at least a in soda ash light, Carbon Dioxide calcium, quicklime, the calcium hydroxide; Addition is high vanadium vanadium titano-magnetite and 5%~12% of the gross weight of the vanadium slag that returns, and the temperature of roasting is 1100 ℃~1250 ℃ in rotary hearth furnace, and roasting time is 30~60 minutes; Product after the roasting dissolves in the sulfuric acid of PH<1.4 or 2.5<PH<4.5; Liquid-solid mass ratio is 5:1 in the dissolution process, 50 ℃~100 ℃ of extraction temperatures, extraction time 1~3 hour.
In the said steps A, preferably add 10% Carbon Dioxide calcium, in the sulfuric acid of PH=0.5, dissolve.
Among the said step B, the residue oven dry that steps A is leached is crushed to below the particle diameter 2mm, adds in coal or the coke powder at least a as reductive agent; The reductive agent consumption is 10%~30% of a residue weight, and adding at least a in wilkinite or molasses or the starch solution be sticker, and the adding binder amount is 1%~5% of a residue weight; Pressure ball oven dry behind the mixing, fast restore is carried out in the oven dry back in rotary hearth furnace, and the reduction temperature in rotary hearth furnace is 1250 ℃~1380 ℃; Recovery time is 20~50 minutes; Directly go back original product and in electric furnace, melt separation, isolate vanadium-bearing hot metal and titanium slag, titanium slag is processed white titanium pigment with sulfuric acid process.
Among the said step C, said vanadium slag is crushed to and turns back to steps A after 200 orders account for 80%.
The present invention can solve current existing technical process can not effectively extract vanadium, titanium to high content of vanadium vanadium titano-magnetite, the not high problem of vanadium, titanium, iron recovery; It is big to solve in the high content of vanadium vanadium titano-magnetite in the titanium slag vanadiumcontent, can not satisfy the problem of producing qualified white titanium pigment requirement; The residue that can solve after acid-leaching vanadium-extracted is joined carbon, the problem that pellet strength is not high.
Specific embodiment:
(granularity: 200 orders account for 80%, staple: V to get somewhere, Liaoning vanadium titano-magnetite 2Kg 2O 51.48%, TFe44.05%, FeO 7.99%, and CaO 0.22%, and MgO 2.9%, SiO 210.47%, Al 2O 33.28%, S 0.012%, and P 0.036%, TiO 215.89%), add the Carbon Dioxide calcium of 0.2Kg, add the 0.08Kg wilkinite, pressure ball behind the mixing, pelletizing carry out roasting in rotary hearth furnace, 1200 ℃ of maturing temperatures, roasting time 60min.With sulfuric acid (liquid-solid ratio 5:1) 80 ℃ under the leaching 3h of the broken back of the cooling of the product after the roasting with PH=0.5, V in the residue after the leaching 2O 5Content 0.37%, the solution containing vanadium body of leaching further is processed into V 2O 5Product.
Residue is crushed to-below the 2mm, get the 1.5Kg residue, with addition of the 0.35Kg hard coal, 0.15Kg starch solution, pressure ball oven dry back fast restore in rotary hearth furnace, 1330 ℃ of reduction temperatures, recovery time 30min, pelletizing degree of metalization 90.97%.Directly go back original product heat and send into molten 0.65Kg molten iron and the 0.76Kg titanium slag told in the electric furnace.TiO in the titanium slag 2Content 30.11%, titanium recovery rate 95.3%, titanium slag is processed white titanium pigment with sulfuric acid process.
Content of vanadium 0.38% in the molten iron, and molten iron after the vanadium extraction, obtains the pig iron of 0.628Kg in converter, obtain containing V 2O 517% vanadium slag 0.022Kg, acid-leaching vanadium-extracted with returning calcification baking after the vanadium slag fragmentation, further extract vanadium.
Final iron recovery 93%, titanium recovery rate 95.3%, vanadium recovery 93.06%.
Beneficial effect of the present invention is:
1. vanadium titano-magnetite obtains fully effectively utilizing, and has avoided generation and the titanium of a large amount of blast furnace slags in the blast-furnace smelting production process can't effective recycling;
2. the residue after adopting rotary hearth furnace to a step vanadium extraction carries out fast restore; Shortened the recovery time; Improve reduction efficiency; Avoided residue with the ring formation problem in the rotary kiln reduction process, and because rotary hearth furnace pellet strength is required is not very high, solved the residue after the vanadium extraction and joined the not high problem of pellet strength behind the carbon;
With vanadium titano-magnetite in the past in extract metallic element method compare, the recovery of titanium and vanadium increases substantially, titanium recovery rate>95%, vanadium recovery>93%.
4. the vanadium slag behind the vanadium extraction by converter blowing incorporates that to carry out secondary vanadium extraction process in the raw material more more economical than separately vanadium slag being carried out vanadium extraction into.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.

Claims (5)

1. a comprehensive method that reclaims vanadium, titanium, iron in the high vanadium vanadium titano-magnetite is characterized in that, may further comprise the steps:
A, in high vanadium vanadium titano-magnetite, add in sodium salt or the calcium salt any, with going out with acidleach after the rotary hearth furnace roasting, separation leach liquor and residue, leach liquor makes the vanadium product;
Allocate carbon in B, the residue in steps A, process the reductibility pelletizing, the fusing in combustion gas molten branch stove or electric furnace of pelletizing oven dry back fast restore in rotary hearth furnace, reduzate separates, and isolates vanadium-bearing hot metal and titanium slag, and titanium slag is processed white titanium pigment;
Isolated vanadium-bearing hot metal is isolated the vanadium slag and the pig iron through the Converter Oxigen Blowing vanadium extraction among C, the step B, turns back to after the vanadium slag fragmentation in the steps A with high vanadium vanadium titano-magnetite to carry out roasting, acid-leaching vanadium-extracted behind the batch mixing together.
2. the method for vanadium, titanium, iron in the high vanadium vanadium titano-magnetite of comprehensive recovery according to claim 1; It is characterized in that; The weight content of the vanadium of high vanadium vanadium titano-magnetite is between 0.8%~3% in the said steps A, is crushed to 200 orders and accounts for 80% back and add at least a in soda ash light, Carbon Dioxide calcium, quicklime, the calcium hydroxide, and addition is high vanadium vanadium titano-magnetite and 5%~12% of the gross weight of the vanadium slag that returns; The temperature of roasting is 1100 ℃~1250 ℃ in rotary hearth furnace; Roasting time is 30~60 minutes, and the product after the roasting dissolves in the sulfuric acid of PH<1.4 or 2.5<PH<4.5, and liquid-solid mass ratio is 5:1 in the dissolution process; 50 ℃~100 ℃ of extraction temperatures, extraction time 1~3 hour.
3. the method for vanadium, titanium, iron is characterized in that in the high vanadium vanadium titano-magnetite of comprehensive recovery according to claim 2, in the said steps A, adds 10% Carbon Dioxide calcium, in the sulfuric acid of PH=0.5, dissolves.
4. the method for vanadium, titanium, iron is characterized in that, among the said step B in the high vanadium vanadium titano-magnetite of comprehensive recovery according to claim 1; The residue oven dry that steps A is leached is crushed to below the particle diameter 2mm, and at least a as reductive agent in adding coal or the coke powder, the reductive agent consumption is 10%~30% of a residue weight; Adding at least a in wilkinite or molasses or the starch solution be sticker, and adding binder amount is 1%~5% of residue weight, and pressure ball is dried behind the mixing; Fast restore is carried out in the oven dry back in rotary hearth furnace; Reduction temperature in rotary hearth furnace is 1250 ℃~1380 ℃, and the recovery time is 20~50 minutes, directly goes back original product and in electric furnace, melts separation; Isolate vanadium-bearing hot metal and titanium slag, titanium slag is processed white titanium pigment with sulfuric acid process.
5. the method for vanadium, titanium, iron is characterized in that in the high vanadium vanadium titano-magnetite of comprehensive recovery according to claim 1, and among the said step C, said vanadium slag is crushed to and turns back to steps A after 200 orders account for 80%.
CN2012102100433A 2012-06-19 2012-06-19 Method for comprehensively recovering vanadium, titanium and iron from high-vanadium vanadium titano-magnetite Pending CN102690944A (en)

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CN104651561A (en) * 2015-02-13 2015-05-27 朝阳金工钒钛科技有限公司 Method for smelting iron ore concentrate of vanadium-titanium magnetite in non-blast furnace
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Application publication date: 20120926