CN104888938A - Vanadium-titanium magnetite concentrate method by using calcinations, oxidation by alkaline leaching, grading and magnetic gravitational reselection - Google Patents

Vanadium-titanium magnetite concentrate method by using calcinations, oxidation by alkaline leaching, grading and magnetic gravitational reselection Download PDF

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Publication number
CN104888938A
CN104888938A CN201510320492.7A CN201510320492A CN104888938A CN 104888938 A CN104888938 A CN 104888938A CN 201510320492 A CN201510320492 A CN 201510320492A CN 104888938 A CN104888938 A CN 104888938A
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magnetic
concentrate
content
classification
ore
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郭客
张志强
韩晓东
王绍燕
王珂
李化
刘晓明
宋仁峰
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Angang Group Mining Co Ltd
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Angang Group Mining Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
    • B03B1/04—Conditioning for facilitating separation by altering physical properties of the matter to be treated by additives
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
    • C22B3/12—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic alkaline solutions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention relates to a vanadium-titanium magnetite concentrate method by using calcinations, oxidation by alkaline leaching, grading and magnetic gravitational reselection. The method comprises the following steps: placing vanadium-titanium magnetite concentrate into aqueous alkali, adding an oxidant, carrying out alkaline leaching reaction for 0.5-2.0 hours at 220-330 DEG C, filtrating a reactant to obtain a filtrate and an alkaline leaching filter cake A, and adding water into the alkaline leaching filter cake A to prepare into ore pulp and then feeding the ore pulp into a cyclone for grading and magnetic gravitational beneficiation combined method. The method provided by the invention has the advantages that either O2 (Oxygen) or H2O2 (Hydrogen Peroxide), during the process of oxidation by alkaline leaching, is introduced so that the oxidation reaction of an S (Sulfur)-containing compound is accelerated, therefore the reaction temperature can be reduced, the reaction time can be shortened and energy consumption and equipment investment can be reduced; furthermore, iron ore concentrate, of which TFe (Tetrafluoroethylene) content is 63-69% and TiO2 (Titanium Oxide) content is 50-70%, can be selected so that the contents of TiO2, S, Si (Silicon), Al (Aluminum) and other impurities which enter a blast furnace can be reduced, the capacity factor of the blast furnace can be improved, and the rate of multipurpose utilization of a titanium resource can be improved.

Description

Alkali oxide leaching, classification and magnetic reconnection is utilized to close the method selecting v-ti magnetite concentrate again
Technical field
The present invention relates to a kind of ore-dressing technique of v-ti magnetite concentrate, particularly relate to a kind of alkali oxide leaching, classification and magnetic reconnection of utilizing and close the method selecting v-ti magnetite concentrate again.
Background technology
Vanadium titano-magnetite is a kind of grandidierite of multiple metallic element, is based on the magnetic iron ore of the symbiosis of iron content, vanadium, titanium.And one of v-ti magnetite concentrate product that to be vanadium titano-magnetite obtain through ore dressing, wherein vanadium is composed with isomorph and is stored in titanomagnetite, displacement ferric ion.Titanomagnetite is oikocryst mineral (Fe 3o 4) and chadacryst ore deposit [ulvite 2FeOTiO 2, ilmenite FeOTiO 2, aluminum-spinel (Mg, Fe) (Al, Fe) 2o 4] complex that formed.Such as, Chinese Panzhihua Region Midi Concentrator v-ti magnetite green ore and the chemistry of the v-ti magnetite concentrate after selecting iron multielement analysis the results are shown in Table 1, and v-ti magnetite green ore and vanadium titano-magnetite concentrate material phase analysis result are respectively in table 2 and table 3.
Table 1 Chinese Panzhihua Region Midi Concentrator raw ore and v-ti magnetite concentrate chemistry multielement analysis result
Element TFe FeO mFe S Fe 2O 3 TiO 2 V 2O 5
Raw ore 29.53 21.36 20.20 0.631 17.70 10.54 0.27 8
Concentrate 54.01 32.42 51.16 0.574 40.97 12.67 0.61
Element SiO 2 Al 2O 3 CaO MgO Co P As
Raw ore 22.80 7.65 6.36 7.23 0.02 0.015 <0.01
Concentrate 3.21 3.30 0.98 2.90 0.02 0.008 <0.010
Table 2 Chinese Panzhihua Region Midi Concentrator v-ti magnetite green ore titanium, iron chemical phase analysis result
Table 3 Chinese Panzhihua Region Midi Concentrator vanadium titano-magnetite concentrate titanium, iron chemical phase analysis result
Vanadium titano-magnetite aboundresources in the world, whole world reserves reach more than 40,000,000,000 tons, and reserves in China reaches 98.3 hundred million tons.In v-ti magnetite ore, iron is mainly composed and is stored in titanomagnetite, the TiO in ore 2main tax is stored in granular ilmenite and titanomagnetite.Generally, the titanium of about 57% is composed and is stored in titanomagnetite (mFeTiO 3nFe 3o 4) in, the titanium of about 40% is composed and is stored in ilmenite (FeTiO 3) in, because vanadium titano-magnetite ore composition is complicated, character is special, and thus the comprehensive utilization of this kind of ore is the international a great problem always thoroughly do not solved.This occurrence characteristics of vanadium titano-magnetite mineral determines the effective separation adopting physical upgrading method cannot realize titanium, iron from the source of ore, cause v-ti magnetite ore after physical upgrading, iron concentrate grade low (TFe<55%), the titanium in iron ore concentrate enters blast furnace slag (TiO completely at ironmaking processes 2content reaches more than 22%) form vitreum, TiO 2lose activity and cannot economic recovery, meanwhile, titanium recovery rate is low only has 18%.Therefore sort titanium iron ore by the beneficiation method of physics and greatly reduce the value that titanium and iron utilizes separately.
China is first country comprehensively extracting iron, vanadium, titanium with commercial scale from complicated vanadium titano-magnetite in the world, but due to general physical method fundamentally can not change iron, the tax of the fine and close symbiosis of titanium deposits characteristic, therefore, adopt the physical upgrading methods such as common gravity separation method, magnetic method, floatation to carry out titanium, iron is separated, efficiency is low, is difficult to select of high grade and the ilmenite concentrate that impurity is few or iron ore concentrate; Meanwhile, TiO 2organic efficiency is not high, v-ti magnetite green ore after Mineral separation, the TiO of about 54% 2enter iron ore concentrate, these TiO 2after blast furnace process, almost all enter slag phase, form TiO 2the blast furnace slag of content 20 ~ 24%; In addition, because the impurity contents such as S, Si, the Al in iron ore concentrate are also too high, above-mentioned reason not only causes that steelmaking furnace usage factor is low, energy consumption is large, titanium resource waste, and amount of slag is large, environmental pollution is serious.
CN2011100879566 discloses " a kind of beneficiation method of ilmenite ", is the magnetic separation after ore grinding, alkaline pretreatment, filtration, again ore grinding of v-ti magnetite green ore is obtained the method for ilmenite concentrate and iron ore concentrate.The method is by iron content 32.16% with containing TiO 2the v-ti magnetite green ore of 12.11%, by magnetic separation process after ore grinding, alkaline pretreatment, filtration, again ore grinding, defines iron content 59.30% iron ore concentrate and contains TiO 2the ilmenite concentrate of 20.15%.Because the method is for ilmenite raw ore, raw ore SiO 2, Al 2o 3, the gangue mineral content such as CaO, MgO is high, the process of alkali leaching preferentially will occur in SiO 2, Al 2o 3with it mineral, define the alkali leaching rear compound similar to titanium in the dipped journey of alkali, the NaOH alkali number of alkali leaching ferrotianium raw ore consumption is 469Kg/t raw ore, and cost is high; And the titanium compound formed after the leaching of ferrotianium raw ore alkali, the compound of the silicon formed after soaking with the gangue mineral alkali such as quartz, it is very difficult for wanting to realize effectively being separated in follow-up magnetic separation, and this also constrains the raising of the rear iron concentrate grade of ferrotianium raw ore alkali leaching and ilmenite concentrate grade.Meanwhile, the method adopts twice grinding process to change mineral surfaces physicochemical properties, adds complexity and the process cost of the method.In a word, by this kind of procedure complexity, and in processing procedure, quantity of alkali consumption is large, cost is high; Meanwhile, more high-grade iron ore concentrate and ilmenite concentrate cannot be obtained.
CN201410164182.6 discloses one and " utilizes alkali oxide leaching, classification and magnetic reconnection to close the method selecting v-ti magnetite concentrate again ", v-ti magnetite concentrate is placed in aqueous slkali by this invention, alkali leaching reaction 0.5 ~ 5 hour, added water by alkali leaching cake and form ore pulp and feed cyclone and carry out classification, sand setting classification gone out carries out magnetic separation and gravity treatment, and to obtain TFe content be respectively 63% ~ 68% iron ore concentrate, TiO 2content is the ilmenite concentrate of 50% ~ 70%.The method achieve and efficiently sort v-ti magnetite concentrate, but adopt alkali leaching due to simple in reaction, react 0.5 ~ 5 hour at 280 ~ 370 DEG C of temperature, chemical reaction temperature is higher, and the time is longer, and SiO after reaction 2and TiO 2content is up to 3%, and impurity content is higher, causes the capacity factor of a blast furnace to reduce, adds ironmaking cost; The alkali number consumed in this inventive method is up to 100kg/t concentrate, and alkaline consumption is higher, and alkali leaching product sodium titanate or the productive rate of potassium titanate are less than 80kg/T raw ore, sodium titanate or the lower titanium resource utilization rate that causes of potassium titanate productive rate not high.
Summary of the invention
In order to overcome the deficiency of above-mentioned beneficiation method, technical problem to be solved by this invention is on the basis that physics and chemistry beneficiation method effectively combines, there is provided a kind of cost low, reclaim quality and efficiency is high, technique is simple, and utilize alkali oxide leaching, classification, the magnetic reconnection of good operability close the method selecting v-ti magnetite concentrate again, achieve and titanium, iron in v-ti magnetite concentrate are efficiently separated, improve into stokehold Iron grade, reduce and enter blast furnace TiO 2, the impurity such as S, Si, Al content, improve the capacity factor of a blast furnace, reduce the discharge capacity of blast furnace slag, reduce ironmaking cost, improve TiO simultaneously 2comprehensive resource utilization rate, reduces environmental pollution.
In order to realize object of the present invention, technical scheme of the present invention is achieved in that
A kind of alkali oxide leaching, classification and magnetic reconnection of utilizing of the present invention closes the method selecting v-ti magnetite concentrate again, it is characterized in that comprising the steps:
1) alkali oxide leaching
Be 50% ~ 55%, TiO by TFe content range 2content range is 10% ~ 15%, SiO 2content is 3% ~ 6%, Al 2o 3content is 3% ~ 6%, the v-ti magnetite concentrate of S content >0.5%, be placed in the aqueous slkali that mass concentration is 5% ~ 52%, add oxidant, then at the temperature of 220 DEG C ~ 330 DEG C, alkali soaks reaction 0.5 ~ 2 hour, reactant is filtered, obtain filtrate and alkali leaching cake A, described filtrate feeds recovery and processing system;
2) classification
Added water by alkali leaching cake A in step 1), the ore pulp forming mass concentration 20% ~ 25% feeds cyclone and carries out classification, and classification goes out sand setting B and overflow Y.
3) magnetic reconnection closes ore dressing
By step 2) in the sand setting B ore pulp making mass concentration 30% ~ 34% that adds water carry out magnetic separation, respectively magnetic concentrate C and magnetic tailing D;
The ore pulp making mass concentration 36% ~ 41% that added water by magnetic tailing D again carries out gravity treatment, respectively gravity concentrate E and gravity tailings F, described magnetic concentrate C to be TFe content range be 63% ~ 69.5% final iron ore concentrate, gravity concentrate E and overflow Y merges into TiO 2content range is the final ilmenite concentrate of 50% ~ 70%, and gravity tailings F is true tailings.
Described aqueous slkali is any one in the NaOH aqueous solution, the KOH aqueous solution or NaOH and KOH mixed aqueous solution.
Described oxidant is O 2or H 2o 2, described O 2addition is 20 ~ 120psi, H 2o 2addition is 50 ~ 200kg/t to ore deposit.
Described magnetic separation adopts the drum magnetic separator of 0.12T ~ 0.15T to carry out magnetic separation.
Described magnetic separation adopts the magnetic dewater cone of 0.03T ~ 0.05T to carry out magnetic separation.
Described magnetic separation adopts the drum magnetic separator of 0.12T ~ 0.15T and 0.03T ~ 0.05T magnetic dewater cone to carry out two stages of magnetic separation respectively.
Described gravity treatment adopts the spiral chute of ￠ 0.6 ~ ￠ 1.2 meters to carry out gravity treatment.
Advantage of the present invention is:
The process of alkali oxide leaching has carried out chemical reaction to elements such as Ti, S, Si, Al in v-ti magnetite concentrate, defines corresponding salt, makes the iron in v-ti magnetite concentrate change the form of iron oxide into.With v-ti magnetite concentrate unlike, SiO in ilmenite raw ore 2and Al 2o 3content far away higher than SiO in v-ti magnetite concentrate 2and Al 2o 3content, wherein SiO in ilmenite raw ore 2>20%, Al 2o 3>7%, SiO in v-ti magnetite concentrate 2<6%, Al 2o 3<6%.In alkali leaching ilmenite raw ore process, because the process of alkali leaching preferentially will occur in SiO 2, Al 2o 3deng on mineral, alkali is made to soak v-ti magnetite concentrate more less than alkali leaching ilmenite raw ore alkali consumption, simultaneously O 2introducing make containing S compound oxidation, oxidized FeTiO 3, accelerate reaction, reduce reaction temperature, shorten the reaction time, better effects if, greatly reduce energy consumption and equipment investment.Such as, when soaking with NaOH alkali oxide, the alkali number that the present invention consumes is less than 90kg/t concentrate, reduces more than 5.2 times, than not passing into O than the alkali number 469kg/t raw ore of alkali leaching raw ore consumption 2alkali leaching consume alkali number reduce 10kg/t concentrate; Meanwhile, O 2introducing alkali is soaked reaction temperature is minimum is down to 220 DEG C, the reaction time is less than 2 hours.
In addition, in the method, the product of alkali oxide leaching is sodium titanate or potassium titanate, the productive rate of sodium titanate or potassium titanate is greater than 100kg/T raw ore, sodium titanate or potassium titanate are present in end product ilmenite concentrate, a large amount of whisker is had, as shown in Figures 3 and 4 by the microstructure of scanning electron microscopic observation ilmenite concentrate is known.The whisker of potassium titanate and sodium titanate has excellent character and applies widely, and main practical feature and performance are: have excellent micro-enhancing and filling capacity; The wear-resisting of excellence undermines Frictional Slipping performance; Excellent surface smoothness and high dimensional accuracy and stability; Processability is good, to process equipment and die wear little; Market price 6.5 ~ 150,000/the ton of potassium titanate crystal whisker.Potassium titanate and sodium titanate are also widely used in flux-cored wire, stainless steel electrode, low-hydrogen electrode, AC/DC welding rod.As welding rod additive, the market price 1.8 ten thousand/ton of sodium titanate, the method effectively improves TiO 2comprehensive resource utilization rate.
Cyclone presses granularity and the gravity grading of mineral, and the titanium compound generated after alkali oxide leaching is than the fine size of iron mineral, and proportion is little, and the difference of specific gravity of titanium, iron is comparatively large, achieves effective separation of titanium, iron.
Add magnetic reconnection and close ore dressing, make iron concentrate grade bring up to 63% ~ 69.5% by 50% ~ 55%, in isolated iron ore concentrate, S content significantly reduces simultaneously, is down to is less than 0.10%, SiO by more than 0.50% 2content is down to less than 1%, Al by 3% ~ 6% 2o 3content is down to less than 1.8%, TiO by 3% ~ 6% 2content is down to less than 6% by more than 12%; Meanwhile, TiO can also be obtained 2content is the ilmenite concentrate of 50% ~ 70%.
The beneficiation method process v-ti magnetite concentrate that integrated use alkali oxide of the present invention leaching, classification and magnetic reconnection close, achieves titanium in v-ti magnetite concentrate, iron is efficiently separated, decrease the TiO entering blast furnace 2, the impurity such as S, Si, Al content, improve the capacity factor of a blast furnace, reduce the discharge capacity of blast furnace slag, reduce ironmaking cost, for subsequent smelting creates better condition, improve the comprehensive utilization ratio of titanium resource simultaneously.
Accompanying drawing explanation
Fig. 1 is present invention process flow chart.
Fig. 2 is the process chart that the present invention adopts two stages of magnetic separation.
Fig. 3 is the microstructure photograph (X10000) of the scanning electron microscopic observation ilmenite concentrate of ilmenite concentrate.
Fig. 4 is the microstructure photograph (X5000) of the scanning electron microscopic observation ilmenite concentrate of ilmenite concentrate.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
Embodiment 1:
As shown in Figure 1.
1) alkali oxide leaching
Be 52.5%, TiO by TFe content 2content is 12.8%, SiO 2content is 4.79%, Al 2o 3content is 4.93%, the v-ti magnetite concentrate of S content 0.73%, is placed in the NaOH aqueous slkali that mass concentration is 10%, passes into the O of 55psi 2, then at the temperature of 240 DEG C, alkali soaks reaction 2.0 hours, and filtered by reactant, obtain filtrate and alkali leaching cake A, NaOH consumption 81.9 kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is:
4mFeTiO 3+8NaOH +mO 2 2mFe 2O 3↓+4Na 2O·(TiO 2) m↓+4H 2O m≥1
pFe 3O 4·q（FeO·TiO 2) +2rNaOH pFe 3O 4↓+qFeO↓+ (Na 2O) r·(TiO 2) q↓+rH 2O
Al 2O 3+2NaOH 2NaAlO 2+ H 2O
tSiO 2+2NaOH Na 2O·(SiO 2) t↓+ H 2O
3FeS 2+6NaOH 3FeS↓+Na 2SO 3+2Na 2S+3H 2O
4FeS 2+ 11O 2 2Fe 2O 3 + 8SO 2
4FeO+O 2 2Fe 2O 3
2SO 2+O 2+4NaOH 2Na 2SO 4+ 2H 2O
2) classification
Added water by alkali leaching cake A in step 1), the ore pulp forming mass concentration 20% feeds cyclone and carries out classification, and classification goes out sand setting B and overflow Y;
3) magnetic reconnection closes ore dressing
By step 2) in sand setting B add water that to feed field intensity be that 0.13T drum magnetic separator carries out magnetic separation for the ore pulp of making mass concentration 30%, obtain magnetic concentrate C and magnetic tailing D;
The ore pulp making mass concentration 36% that added water by magnetic tailing D again carries out gravity treatment, respectively gravity concentrate E and gravity tailings F, described magnetic concentrate C to be TFe content be 64.6% final iron ore concentrate, wherein SiO 2content is 0.45%, Al 2o 3content is 1.59%, S content is 0.02%; Gravity concentrate E and overflow Y merges into TiO 2content is the final ilmenite concentrate of 50.8%, and gravity tailings F is true tailings.
In the method, the product of alkali oxide leaching is sodium titanate, and the productive rate of sodium titanate is greater than 100kg/T raw ore, and sodium titanate is present in end product ilmenite concentrate, has a large amount of whisker, as shown in Figure 3 by the microstructure of scanning electron microscopic observation ilmenite concentrate is known.
Embodiment 2:
As shown in Figure 1.
1) alkali oxide leaching
Be 51.3%, TiO by TFe content 2content is 11.9%, SiO 2content is 4.70%, Al 2o 3content is 4.96%, the v-ti magnetite concentrate of S content 0.85%, is placed in the NaOH aqueous slkali that mass concentration is 17%, passes into the O of 113psi 2, then at the temperature of 225 DEG C, alkali soaks reaction 2.0 hours, and filtered by reactant, obtain filtrate and alkali leaching cake A, NaOH consumption 80.8kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1;
2) classification
Added water by alkali leaching cake A in step 1), the ore pulp forming mass concentration 21% feeds cyclone and carries out classification, and classification goes out sand setting B and overflow Y;
3) magnetic reconnection closes ore dressing
By step 2) in sand setting B add water that to feed field intensity be that 0.05T magnetic dewater cone carries out magnetic separation for the ore pulp of making mass concentration 31%, obtain magnetic concentrate C and magnetic tailing D;
The ore pulp making mass concentration 38% that added water by magnetic tailing D again carries out gravity treatment, respectively gravity concentrate E and gravity tailings F, described magnetic concentrate C to be TFe content be 65.5% final iron ore concentrate, wherein SiO 2content is 0.51%, Al 2o 3content is 1.54%, S content is 0.01%; Gravity concentrate E and overflow Y merges into TiO 2content is the final ilmenite concentrate of 53.9%, and gravity tailings F is true tailings.
In the method, the product of alkali oxide leaching is sodium titanate, and the micro-structural feature of ilmenite concentrate as shown in Figure 3.
Embodiment 3:
As shown in Figure 1.
1) alkali oxide leaching
Be 50.4%, TiO by TFe content 2content is 14.6%, SiO 2content is 4.72%, Al 2o 3content is 4.69%, the v-ti magnetite concentrate of S content 0.66%, is placed in the NaOH aqueous slkali that mass concentration is 23%, adds 196kg/t to ore deposith 2o 2, then at the temperature of 250 DEG C, alkali soaks reaction 1.0 hours, and filtered by reactant, obtain filtrate and alkali leaching cake A, NaOH consumption 79.3kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is:
2mFeTiO 3+4NaOH+mH 2O mFe 2O 3↓+2Na 2O·(TiO 2) m↓+(m+2)H 2O m≥1
pFe 3O 4·q（FeO·TiO 2) +2rNaOH pFe 3O 4↓+qFeO↓+ (Na 2O) r·(TiO 2) q↓+rH 2O
Al 2O 3+2NaOH 2NaAlO 2+ H 2O
tSiO 2+2NaOH Na 2O·(SiO 2) t↓+ H 2O
3FeS 2+6NaOH 3FeS↓+Na 2SO 3+2Na 2S+3H 2O
2FeS 2+ 11H 2O 2 Fe 2O 3 +4SO 2+ 11H 2O
2FeO+H 2O 2 Fe 2O 3+ H 2O
SO 2+H 2O 2+2NaOH Na 2SO 4+ 2H 2O
2) classification
Added water by alkali leaching cake A in step 1), the ore pulp forming mass concentration 22% feeds cyclone and carries out classification, and classification goes out sand setting B and overflow Y;
3) magnetic reconnection closes ore dressing
By step 2) in sand setting B add water that to feed field intensity be that 0.03T magnetic dewater cone carries out magnetic separation for the ore pulp of making mass concentration 30%, obtain magnetic concentrate C and magnetic tailing D;
The ore pulp making mass concentration 39% that added water by magnetic tailing D again carries out gravity treatment, respectively gravity concentrate E and gravity tailings F, described magnetic concentrate C to be TFe content be 67.1% final iron ore concentrate, wherein SiO 2content is 0.50%, Al 2o 3content is 1.16%, S content is 0.01%; Gravity concentrate E and overflow Y merges into TiO 2content is the final ilmenite concentrate of 61.2%, and gravity tailings F is true tailings.
In the method, the product of alkali oxide leaching is sodium titanate, and the micro-structural feature of ilmenite concentrate as shown in Figure 3.
Embodiment 4:
As shown in Figure 1.
1) alkali oxide leaching
Be 53.2%, TiO by TFe content 2content is 11.4%, SiO 2content is 4.95%, Al 2o 3content is 4.91%, the v-ti magnetite concentrate of S content 0.70%, is placed in the NaOH aqueous slkali that mass concentration is 31%, passes into the O of 64psi 2, then at the temperature of 285 DEG C, alkali soaks reaction 1.0 hours, and filtered by reactant, obtain filtrate and alkali leaching cake A, NaOH consumption 81.2kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1;
2) classification
Added water by alkali leaching cake A in step 1), the ore pulp forming mass concentration 23% feeds cyclone and carries out classification, and classification goes out sand setting B and overflow Y;
3) magnetic reconnection closes ore dressing
By step 2) in sand setting B add water that to feed field intensity be that 0.05T magnetic dewater cone carries out magnetic separation for the ore pulp of making mass concentration 32%, obtain magnetic concentrate C and magnetic tailing D;
The ore pulp making mass concentration 40% that added water by magnetic tailing D again carries out gravity treatment, respectively gravity concentrate E and gravity tailings F, described magnetic concentrate C to be TFe content be 68.0% final iron ore concentrate, wherein SiO 2content is 0.50%, Al 2o 3content is 1.25%, S content is 0.01%; Gravity concentrate E and overflow Y merges into TiO 2content is the final ilmenite concentrate of 62.0%, and gravity tailings F is true tailings.
In the method, the product of alkali oxide leaching is sodium titanate, and the micro-structural feature of ilmenite concentrate as shown in Figure 3.
Embodiment 5:
As shown in Figure 2.
1) alkali oxide leaching
Be 52.8%, TiO by TFe content 2content is 12.4%, SiO 2content is 4.01%, Al 2o 3content is 4.69%, the v-ti magnetite concentrate of S content 0.70%, is placed in the KOH aqueous slkali that mass concentration is 40%, passes into the O of 85psi 2, then at the temperature of 235 DEG C, alkali soaks reaction 0.5 hour, and filtered by reactant, obtain filtrate and alkali leaching cake A, KOH consumption 78.6 kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is:
4mFeTiO 3+8KOH+mO 2 2mFe 2O 3↓+4K 2O·(TiO 2) m↓+4H 2O m≥1
pFe 3O 4·q（FeO·TiO 2) +2rKOH pFe 3O 4↓+qFeO↓+ (K 2O) r·(TiO 2) q↓+rH 2O
Al 2O 3+2KOH 2KAlO 2+ H 2O
tSiO 2+2KOH K 2O·（SiO 2） t↓+ H 2O
3FeS 2+6KOH 3FeS↓+K 2SO 3+2K 2S+3H 2O
4FeS 2+ 11O 2 2Fe 2O 3 + 8SO 2
4FeO+O 2 2Fe 2O 3
2SO 2+O 2+4KOH 2K 2SO 4+ 2H 2O
2) classification
Added water by alkali leaching cake A in step 1), the ore pulp forming mass concentration 24% feeds cyclone and carries out classification, and classification goes out sand setting B and overflow Y;
3) magnetic reconnection closes ore dressing
By step 2) in sand setting B add water that to feed field intensity be that 0.05T magnetic dewater cone carries out magnetic separation for the ore pulp of making mass concentration 33%, obtain magnetic concentrate C and magnetic tailing D;
The ore pulp making mass concentration 41% that added water by magnetic tailing D again carries out gravity treatment, respectively gravity concentrate E and gravity tailings F, described magnetic concentrate C to be TFe content be 67.2% final iron ore concentrate, wherein SiO 2content is 0.47%, Al 2o 3content is 1.25%, S content is 0.01%; Gravity concentrate E and overflow Y merges into TiO 2content is the final ilmenite concentrate of 64.8%, and gravity tailings F is true tailings.
In the method, the product of alkali oxide leaching is potassium titanate, and the productive rate of potassium titanate is greater than 100kg/T raw ore, and potassium titanate is present in end product ilmenite concentrate, has a large amount of whisker, as shown in Figure 4 by the microstructure of scanning electron microscopic observation ilmenite concentrate is known.
Embodiment 6:
As shown in Figure 2.
1) alkali oxide leaching
Be 54.7%, TiO by TFe content 2content is 10.4%, SiO 2content is 3.65%, Al 2o 3content is 4.38%, the v-ti magnetite concentrate of S content 0.63%, is placed in the KOH aqueous slkali that mass concentration is 50%, adds 92kg/t to ore deposith 2o 2, then at the temperature of 260 DEG C, alkali soaks reaction 0.5 hour, and filtered by reactant, obtain filtrate and alkali leaching cake A, KOH consumption 88.7 kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is:
2mFeTiO 3+4KOH+mH 2O 2 mFe 2O 3↓+2K 2O·(TiO 2) m↓+(m+2)H 2O m≥1
pFe 3O 4·q（FeO·TiO 2) +2rKOH pFe 3O 4↓+qFeO↓+ (K 2O) r·(TiO 2) q↓+rH 2O
Al 2O 3+2KOH 2KAlO 2+ H 2O
tSiO 2+2KOH K 2O·(SiO 2) t↓+ H 2O
3FeS 2+6KOH 3FeS↓+K 2SO 3+2K 2S+3H 2O
2FeS 2+ 11H 2O 2 Fe 2O 3 +4SO 2+ 11H 2O
2FeO+H 2O 2 Fe 2O 3+ H 2O
SO 2+H 2O 2+2KOH K 2SO 4+ 2H 2O
2) classification
Added water by alkali leaching cake A in step 1), the ore pulp forming mass concentration 25% feeds cyclone and carries out classification, and classification goes out sand setting B and overflow Y;
3) magnetic reconnection closes ore dressing
By step 2) in sand setting B add water that to feed field intensity be that 0.05T magnetic dewater cone carries out magnetic separation for the ore pulp of making mass concentration 30%, obtain an a stages of magnetic separation concentrate C1 and stages of magnetic separation mine tailing D1; It is that 0.13T drum magnetic separator carries out two stages of magnetic separation that one stages of magnetic separation concentrate C1 is fed field intensity, obtains two stages of magnetic separation concentrate C2 and two stages of magnetic separation mine tailing D2; Two stages of magnetic separation mine tailing D1 and D2 is merged the ore pulp making mass concentration 41% that adds water and carries out gravity treatment, respectively gravity concentrate E and gravity tailings F, described magnetic concentrate C2 to be TFe content be 68.5% final iron ore concentrate, wherein SiO 2content is 0.27%, Al 2o 3content is 1.28%, S content is 0.01%; Gravity concentrate E and overflow Y merges into TiO 2content is the final ilmenite concentrate of 69.1%, and gravity tailings F is true tailings.
In the method, the product of alkali oxide leaching is potassium titanate, and the micro-structural feature of ilmenite concentrate as shown in Figure 4.
Embodiment 7:
As shown in Figure 2.
1) alkali oxide leaching
Be 54.0%, TiO by TFe content 2content is 10.9%, SiO 2content is 3.45%, Al 2o 3content is 4.39%, the v-ti magnetite concentrate of S content 0.63%, is placed in that NaOH mass concentration is 27%, KOH mass concentration is the mixed aqueous solution of 9%, passes into the O of 22psi 2, then at the temperature of 325 DEG C, alkali soaks reaction 1.0 hours, is filtered by reactant, filtrate and alkali leaching cake A, NaOH consumption 42.8kg/t to ore deposit, KOH consumption 31.4kg/t is to ore deposit, described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1 and embodiment 5;
2) classification
Added water by alkali leaching cake A in step 1), the ore pulp forming mass concentration 25% feeds cyclone and carries out classification, and classification goes out sand setting B and overflow Y;
3) magnetic reconnection closes ore dressing
By step 2) in sand setting B add water that to feed field intensity be that 0.05T magnetic dewater cone carries out magnetic separation for the ore pulp of making mass concentration 30%, obtain an a stages of magnetic separation concentrate C1 and stages of magnetic separation mine tailing D1; It is that 0.13T drum magnetic separator carries out two stages of magnetic separation that one stages of magnetic separation concentrate C1 is fed field intensity, obtains two stages of magnetic separation concentrate C2 and two stages of magnetic separation mine tailing D2; Two stages of magnetic separation mine tailing D1 and D2 is merged the ore pulp making mass concentration 41% that adds water and carries out gravity treatment, respectively gravity concentrate E and gravity tailings F, described magnetic concentrate C2 to be TFe content be 69.4% final iron ore concentrate, wherein SiO 2content is 0.38%, Al 2o 3content is 1.24%, S content is 0.01%; Gravity concentrate E and overflow Y merges into TiO 2content is the final ilmenite concentrate of 68.6%, and gravity tailings F is true tailings.
In the method, the product of alkali oxide leaching is potassium titanate and sodium titanate, and the gross production rate of potassium titanate and sodium titanate is greater than 100kg/T raw ore, and potassium titanate and sodium titanate are present in end product ilmenite concentrate.
Embodiment 8:
As shown in Figure 2.
1) alkali oxide leaching
Be 54.2%, TiO by TFe content 2content is 10.6%, SiO 2content is 3.49%, Al 2o 3content is 4.32%, the v-ti magnetite concentrate of S content 0.64%, is placed in that NaOH mass concentration is 25%, KOH mass concentration is the mixed aqueous solution of 10%, adds 50.6kg/t to ore deposith 2o 2, then at the temperature of 320 DEG C, alkali soaks reaction 1.5 hours, is filtered by reactant, filtrate and alkali leaching cake A, NaOH consumption 43.6kg/t to ore deposit, KOH consumption 30.8kg/t is to ore deposit, described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 3 and embodiment 6;
2) classification
Added water by alkali leaching cake A in step 1), the ore pulp forming mass concentration 25% feeds cyclone and carries out classification, and classification goes out sand setting B and overflow Y;
3) magnetic reconnection closes ore dressing
By step 2) in sand setting B add water that to feed field intensity be that 0.05T magnetic dewater cone carries out magnetic separation for the ore pulp of making mass concentration 30%, obtain an a stages of magnetic separation concentrate C1 and stages of magnetic separation mine tailing D1; It is that 0.13T drum magnetic separator carries out two stages of magnetic separation that one stages of magnetic separation concentrate C1 is fed field intensity, obtains two stages of magnetic separation concentrate C2 and two stages of magnetic separation mine tailing D2; Two stages of magnetic separation mine tailing D1 and D2 is merged the ore pulp making mass concentration 41% that adds water and carries out gravity treatment, respectively gravity concentrate E and gravity tailings F, described magnetic concentrate C2 to be TFe content be 69.0% final iron ore concentrate, wherein SiO 2content is 0.41%, Al 2o 3content is 1.20%, S content is 0.01%; Gravity concentrate E and overflow Y merges into TiO 2content is the final ilmenite concentrate of 67.8%, and gravity tailings F is true tailings.
In the method, the product of alkali oxide leaching is potassium titanate and sodium titanate, and the gross production rate of potassium titanate and sodium titanate is greater than 100kg/T raw ore, and potassium titanate and sodium titanate are present in end product ilmenite concentrate.

Claims (7)

1. utilize alkali oxide leaching, classification and magnetic reconnection to close the method selecting v-ti magnetite concentrate again, it is characterized in that comprising the steps:
1) alkali oxide leaching
Be 50% ~ 55%, TiO by TFe content range 2content range is 10% ~ 15%, SiO 2content is 3% ~ 6%, Al 2o 3content is 3% ~ 6%, the v-ti magnetite concentrate of S content >0.5%, be placed in the aqueous slkali that mass concentration is 5% ~ 52%, add oxidant, then at the temperature of 220 DEG C ~ 330 DEG C, alkali soaks reaction 0.5 ~ 2 hour, reactant is filtered, obtain filtrate and alkali leaching cake A, described filtrate feeds recovery and processing system;
2) classification
Added water by alkali leaching cake A in step 1), the ore pulp forming mass concentration 20% ~ 25% feeds cyclone and carries out classification, and classification goes out sand setting B and overflow Y;
Magnetic reconnection closes ore dressing
By step 2) in the sand setting B ore pulp making mass concentration 30% ~ 34% that adds water carry out magnetic separation, respectively magnetic concentrate C and magnetic tailing D;
The ore pulp making mass concentration 36% ~ 41% that added water by magnetic tailing D again carries out gravity treatment, respectively gravity concentrate E and gravity tailings F, described magnetic concentrate C to be TFe content range be 63% ~ 69.5% final iron ore concentrate, gravity concentrate E and overflow Y merges into TiO 2content range is the final ilmenite concentrate of 50% ~ 70%, and gravity tailings F is true tailings.
2. according to claim 1ly utilize that alkali oxide soaks, classification and magnetic reconnection close the method selecting v-ti magnetite concentrate again, it is characterized in that described aqueous slkali is any one in the NaOH aqueous solution, the KOH aqueous solution or NaOH and KOH mixed aqueous solution.
3. alkali oxide leaching, classification and the magnetic reconnection of utilizing according to claim 1 closes the method selecting v-ti magnetite concentrate again, it is characterized in that described oxidant is O 2or H 2o 2, described O 2addition is 20 ~ 120psi, H 2o 2addition is 50 ~ 200kg/t to ore deposit.
4. alkali oxide leaching, classification and the magnetic reconnection of utilizing according to claim 1 closes the method selecting v-ti magnetite concentrate again, it is characterized in that described magnetic separation adopts the drum magnetic separator of 0.12T ~ 0.15T to carry out magnetic separation.
5. alkali oxide leaching, classification and the magnetic reconnection of utilizing according to claim 1 closes the method selecting v-ti magnetite concentrate again, it is characterized in that described magnetic separation adopts the magnetic dewater cone of 0.03T ~ 0.05T to carry out magnetic separation.
6. alkali oxide leaching, classification and the magnetic reconnection of utilizing according to claim 1 closes the method selecting v-ti magnetite concentrate again, it is characterized in that described magnetic separation adopts the drum magnetic separator of 0.12T ~ 0.15T and 0.03T ~ 0.05T magnetic dewater cone to carry out two stages of magnetic separation respectively.
7. alkali oxide leaching, classification and the magnetic reconnection of utilizing according to claim 1 closes the method selecting v-ti magnetite concentrate again, it is characterized in that described gravity treatment adopts the spiral chute of ￠ 0.6 ~ ￠ 1.2 meters to carry out gravity treatment.
CN201510320492.7A 2015-06-12 2015-06-12 Vanadium-titanium magnetite concentrate method by using calcinations, oxidation by alkaline leaching, grading and magnetic gravitational reselection Pending CN104888938A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010051120A1 (en) * 1997-10-17 2001-12-13 Marcelo De Matos Process for the production titanium concentrate having a chemical composition similar to ilmenite from highly impure anatase ores
CN102181626A (en) * 2011-04-08 2011-09-14 北京矿冶研究总院 Beneficiation method of ilmenite
CN103834812A (en) * 2012-11-26 2014-06-04 贵阳铝镁设计研究院有限公司 Method for preparing titanium-rich material from low-grade TiO2 slag
CN103962219A (en) * 2014-04-23 2014-08-06 鞍钢集团矿业公司 Vanadium-titanium magnetite concentrate recleaning method realized through alkaline leaching, classification and combined magnetic-gravity separation
CN103962229A (en) * 2014-04-23 2014-08-06 鞍钢集团矿业公司 Method for recleaning of vanadium-titanium magnetite concentrates through calcination, alkaline leaching, classification and combination of magnetic separation and gravity concentration

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010051120A1 (en) * 1997-10-17 2001-12-13 Marcelo De Matos Process for the production titanium concentrate having a chemical composition similar to ilmenite from highly impure anatase ores
CN102181626A (en) * 2011-04-08 2011-09-14 北京矿冶研究总院 Beneficiation method of ilmenite
CN103834812A (en) * 2012-11-26 2014-06-04 贵阳铝镁设计研究院有限公司 Method for preparing titanium-rich material from low-grade TiO2 slag
CN103962219A (en) * 2014-04-23 2014-08-06 鞍钢集团矿业公司 Vanadium-titanium magnetite concentrate recleaning method realized through alkaline leaching, classification and combined magnetic-gravity separation
CN103962229A (en) * 2014-04-23 2014-08-06 鞍钢集团矿业公司 Method for recleaning of vanadium-titanium magnetite concentrates through calcination, alkaline leaching, classification and combination of magnetic separation and gravity concentration

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