CN105296752A - Method for recleaning vanadium-titanium magnetite concentrates by using oxidation and alkaline leaching, desliming and combined magneto-gravity separation - Google Patents
Method for recleaning vanadium-titanium magnetite concentrates by using oxidation and alkaline leaching, desliming and combined magneto-gravity separation Download PDFInfo
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Abstract
The invention relates to a method for recleaning vanadium-titanium magnetite concentrates by using oxidation and alkaline leaching, desliming and combined magneto-gravity separation. The method comprises the following steps: vanadium-titanium magnetite concentrates are put into an alkaline solution and an oxidizing agent is added; then an alkaline leaching reaction lasts for 0.5-2 hours at the temperature of 220 DEG C-330 DEG C; reactants are filtered, so that a filtrate and an alkaline leaching filter cake A are obtained; and the filter cake A is added with water, and the mixture is prepared into ore pulp for desliming and combined magneto-gravity recleaning. The method has the advantages as follows: due to the introduction of O2 or H2O2 during oxidation and alkaline leaching, compounds containing S are oxidized, the reaction is accelerated, and the reaction temperature and the energy consumption are reduced. Besides, an iron ore concentrate with the TFe content of 65 %-70 % and a titanium concentrate with the TiO2 content of 50 %-70 % are screened, so that efficient separation of titanium and iron in vanadium-titanium magnetite concentrates is achieved, the content of impurities entering a blast furnace, such as TiO2, S, Si, Al and the like is reduced, the utilization coefficient of blast furnace is increased, and the comprehensive utilization ratio of titanium resources is increased as well.
Description
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, desliming and magnetic reconnection of utilizing and close the method selecting v-ti magnetite concentrate again.
Background technology
Vanadium titano-magnetite is a kind of complex ore of multiple metallic element, is based on the magnetite 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 body 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 concentration method cannot realize titanium, iron from the source of ore, cause v-ti magnetite ore after physical concentration, iron concentrate grade low (TFe<55%), the titanium in iron ore concentrate enters blast furnace slag (TiO completely at iron manufacturing process
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 technical 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 concentration methods such as common gravity separation method, magnetic method, flotation process 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 smelting, almost all enter slag phase, form TiO
2the blast furnace slag of content 20 ~ 24%; In addition, because the foreign matter contents such as S, Si, the Al in iron ore concentrate are also too high, above-mentioned reason not only causes that steelmaking furnace utilization coefficient 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 surface physicochemical property, adds complexity and the process cost of the method.In a word, by this kind of procedure complexity, and in treating processes, quantity of alkali consumption is large, cost is high; Meanwhile, more high-grade iron ore concentrate and ilmenite concentrate cannot be obtained.
CN201310183580.8 discloses " a kind of wet processing sefstromite concentrate prepares the method for titanium liquid ", proposes the method with salt pickling separating titanium iron.This invention is the method that wet processing v-ti magnetite concentrate prepares titanium liquid, comprise v-ti magnetite concentrate hydrochloric acid leaching, molten salt react ion, again pickling, sulfuric acid solution, filtration etc. and obtain the processes such as titanium liquid, the method is mainly for extraction ilmenite concentrate, its complex technical process, need in hydrochloric acid leaching process to react with hydrochloric acid and iron and vanadium to dissolve in filtrate, consume a large amount of hydrochloric acid, cost is high; Meanwhile, NaOH and titanium and pasc reaction is used to consume alkali in fused salt process.In addition, owing to employing hydrochloric acid in the method leaching process, in hydrochloric acid, chlorion is large to equipment corrosion, not easily suitability for industrialized production.The method is mainly applicable to the recycling of titanium in the low poor v-ti magnetite concentrate of high vanadium low iron content.
CN201410165798.5 discloses one and " utilizes alkali leaching, desliming and magnetic reconnection to close the method selecting v-ti magnetite concentrate again ", v-ti magnetite concentrate is placed in alkaline solution by this invention, after alkali leaching reaction alkali leaching cake added water and be mixed with ore pulp and carry out desliming operation, again the sand setting that desliming obtains is added water and make ore pulp and carry out magnetic separation, again magnetic tailing is carried out gravity treatment, obtain iron ore concentrate, TiO that TFe content range is 63% ~ 68% respectively
2content range 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 foreign matter 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 ratio 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, desliming and the magnetic reconnection of good operability close the method selecting v-ti magnetite concentrate again, achieve and high efficiency separation is carried out to titanium, iron in v-ti magnetite concentrate, 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 quantity discharged 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, desliming 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 alkaline solution that mass concentration is 5% ~ 52%, add oxygenant, 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) desliming
Alkali leaching cake A in step 1) is added water be mixed with mass concentration be 21% ~ 25% ore pulp carry out desliming operation, obtain sand setting B and overflow C;
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 D and magnetic tailing E;
The ore pulp making mass concentration 36% ~ 41% that added water by magnetic tailing E again carries out gravity treatment, respectively gravity concentrate F and gravity tailings G, described magnetic concentrate D to be TFe content range be 65% ~ 70% final iron ore concentrate, gravity concentrate F and overflow C merges into TiO
2content range is the final ilmenite concentrate of 50% ~ 70%, and gravity tailings G is true tailings.
Described alkaline solution is any one in the NaOH aqueous solution, the KOH aqueous solution or NaOH and KOH mixed aqueous solution.
Described oxygenant is O
2or H
2o
2, described O
2add-on is 20 ~ 120psi, H
2o
2add-on is 50 ~ 200kg/t
to ore deposit.
Described desliming operation adopts the desliming bucket of ∮ 3 ~ 5 meters to carry out desliming operation.
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 ferric 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 temperature of reaction, shorten the reaction times, better effects if, greatly reduce energy consumption and facility 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 temperature of reaction is minimum is down to 220 DEG C, the reaction times is less than 2 hours.
In addition, in the method, the reaction 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 final 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 precision and stability; Processability is good, to processing units 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.
Desliming process presses granularity and the gravity grading of mineral, and the titanium compound generated after alkali leaching is than the fine size of magnet mineral, and proportion is little, and the difference of specific gravity of ferrotianium is comparatively large, achieves effective separation of ferrotianium.
Add magnetic reconnection and close ore dressing, make iron concentrate grade bring up to 65% ~ 70% 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 leaching of the present invention, desliming and magnetic reconnection close, achieves titanium in v-ti magnetite concentrate, iron high efficiency separation, decreases the TiO entering blast furnace
2, the impurity such as S, Si, Al content, improve the capacity factor of a blast furnace, reduce the quantity discharged 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 schema.
Fig. 2 is the process flow sheet 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.
Embodiment
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 51.1%, TiO by TFe content
2content is 14.5%, SiO
2content is 4.98%, Al
2o
3content is 4.85%, the v-ti magnetite concentrate of S content 0.82%, is placed in the NaOH alkaline solution that mass concentration is 12%, passes into the O of 99psi
2, then at the temperature of 330 DEG C, alkali soaks reaction 1.5 hours, and filtered by reactant, obtain filtrate and alkali leaching cake A, NaOH consumption 83.7kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is:
4mFeTiO
3+8NaOH+mO
22mFe
2O
3↓+4Na
2O·(TiO
2)
m↓+4H
2Om≥1
pFe
3O
4·q（FeO·TiO
2)+2rNaOHpFe
3O
4↓+qFeO↓+(Na
2O)
r·(TiO
2)
q↓+rH
2O
Al
2O
3+2NaOH2NaAlO
2+H
2O
tSiO
2+2NaOHNa
2O·(SiO
2)
t↓+H
2O
3FeS
2+6NaOH3FeS↓+Na
2SO
3+2Na
2S+3H
2O
4FeS
2+11O
22Fe
2O
3+8SO
2
4FeO+O
2 2Fe
2O
3
2SO
2+O
2+4NaOH
2Na
2SO
4+2H
2O
2) desliming
Alkali leaching cake A in step 1) is added water be mixed with mass concentration be 22% the ore pulp desliming bucket that feeds ∮ 3.0 meters carry out desliming operation, obtain sand setting B and overflow C;
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 34%, obtain magnetic concentrate D and magnetic tailing E;
The ore pulp making mass concentration 40% that added water by magnetic tailing E again carries out gravity treatment, respectively gravity concentrate F and gravity tailings G, described magnetic concentrate D to be TFe content be 69.8% final iron ore concentrate, wherein SiO
2content is 0.35%, Al
2o
3content is 1.22%, S content is 0.01%; Gravity concentrate F and overflow C merges into TiO
2content is the final ilmenite concentrate of 64.5%, and gravity tailings G is true tailings.
In the method, the reaction 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 final 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 51.9%, TiO by TFe content
2content is 14.0%, SiO
2content is 4.61%, Al
2o
3content is 4.92%, the v-ti magnetite concentrate of S content 0.84%, is placed in the NaOH alkaline solution that mass concentration is 7%, passes into the O of 21psi
2, then at the temperature of 220 DEG C, alkali soaks reaction 2.0 hours, and filtered by reactant, obtain filtrate and alkali leaching cake A, NaOH consumption 53.8kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1;
2) desliming
Alkali leaching cake A in step 1) is added water be mixed with mass concentration be 21% the ore pulp desliming bucket that feeds ∮ 5.0 meters carry out desliming operation, obtain sand setting B and overflow C;
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 D and magnetic tailing E;
The ore pulp making mass concentration 39% that added water by magnetic tailing E again carries out gravity treatment, respectively gravity concentrate F and gravity tailings G, described magnetic concentrate D to be TFe content be 65.5% final iron ore concentrate, wherein SiO
2content is 0.40%, Al
2o
3content is 1.55%, S content is 0.02%; Gravity concentrate F and overflow C merges into TiO
2content is the final ilmenite concentrate of 52.2%, and gravity tailings G is true tailings.
In the method, the reaction 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 52.5%, TiO by TFe content
2content is 13.6%, SiO
2content is 4.76%, Al
2o
3content is 4.75%, the v-ti magnetite concentrate of S content 0.83%, is placed in the NaOH alkaline solution that mass concentration is 28%, adds 89kg/t
to ore deposith
2o
2, then at the temperature of 290 DEG C, alkali soaks reaction 1.5 hours, and filtered by reactant, obtain filtrate and alkali leaching cake A, NaOH consumption 85.1kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is:
2mFeTiO
3+4NaOH+mH
2O
2mFe
2O
3↓+2Na
2O·(TiO
2)
m↓+(m+2)H
2Om≥1
pFe
3O
4·q（FeO·TiO
2)+2rNaOHpFe
3O
4↓+qFeO↓+(Na
2O)
r·(TiO
2)
q↓+rH
2O
Al
2O
3+2NaOH2NaAlO
2+H
2O
tSiO
2+2NaOHNa
2O·(SiO
2)
t↓+H
2O
3FeS
2+6NaOH3FeS↓+Na
2SO
3+2Na
2S+3H
2O
2FeS
2+11H
2O
2Fe
2O
3+4SO
2+11H
2O
2FeO+H
2O
2Fe
2O
3+H
2O
SO
2+H
2O
2+2NaOHNa
2SO
4+2H
2O
2) desliming
Alkali leaching cake A in step 1) is added water be mixed with mass concentration be 23% the ore pulp desliming bucket that feeds ∮ 3.0 meters carry out desliming operation, obtain sand setting B and overflow C;
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 32%, obtain magnetic concentrate D and magnetic tailing E;
The ore pulp making mass concentration 38% that added water by magnetic tailing E again carries out gravity treatment, respectively gravity concentrate F and gravity tailings G, described magnetic concentrate D to be TFe content range be 66.9% final iron ore concentrate, wherein SiO
2content is 0.44%, Al
2o
3content is 1.52%, S content is 0.02%; Gravity concentrate F and overflow C merges into TiO
2content is the final ilmenite concentrate of 57.9%, and gravity tailings G is true tailings.
In the method, the reaction 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 2.
1) alkali oxide leaching
Be 53.4%, TiO by TFe content
2content is 12.9%, SiO
2content is 4.85%, Al
2o
3content is 4.74%, the v-ti magnetite concentrate of S content 0.85%, is placed in the NaOH alkaline solution that mass concentration is 40%, passes into the O of 78psi
2, then at the temperature of 310 DEG C, alkali soaks reaction 0.5 hour, and filtered by reactant, obtain filtrate and alkali leaching cake A, NaOH consumption 77.4kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1;
2) desliming
Alkali leaching cake A in step 1) is added water be mixed with mass concentration be 24% the ore pulp desliming bucket that feeds ∮ 5.0 meters carry out desliming operation, obtain sand setting B and overflow C;
3) magnetic reconnection closes ore dressing
By step 2) in sand setting B add water that to feed field intensity be that the magnetic dewater cone of 0.03T carries out a stages of magnetic separation for the ore pulp of making mass concentration 31%, obtain an a magnetic essence D1 and magnetic tail E1 respectively; Two stages of magnetic separation are carried out to the drum magnetic separator that the ore pulp employing field intensity of a magnetic essence D1 mass concentration 32% is 0.13T, obtains two magnetic essence D2 bis-magnetic tail E2 respectively;
The spiral chute ore pulp of two magnetic tail E2 mass concentrations 41% being fed ￠ 0.6 meter again carries out gravity treatment, obtains gravity concentrate F and gravity tailings G respectively, and two described magnetic essence D2 and gravity concentrate F merge into the final iron ore concentrate that TFe content is 68.7%, wherein SiO
2content is 0.40%, Al
2o
3content is 1.31%, S content is 0.01%; One magnetic tail E1 and overflow C merges into TiO
2content is the ilmenite concentrate of 69.2%, and described gravity tailings G is true tailings.
In the method, the reaction 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 1.
1) alkali oxide leaching
Be 54.1%, TiO by TFe content
2content is 11.0%, SiO
2content is 3.26%, Al
2o
3content is 4.79%, the v-ti magnetite concentrate of S content 0.64%, is placed in the KOH alkaline solution that mass concentration is 15%, passes into the O of 91psi
2, then at the temperature of 265 DEG C, alkali soaks reaction 105 minutes, and filtered by reactant, obtain filtrate and alkali leaching cake A, KOH consumption 85.7kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is:
4mFeTiO
3+8KOH+mO
22mFe
2O
3↓+4K
2O·(TiO
2)
m↓+4H
2Om≥1
pFe
3O
4·q（FeO·TiO
2)+2rKOHpFe
3O
4↓+qFeO↓+(K
2O)
r·(TiO
2)
q↓+rH
2O
Al
2O
3+2KOH2KAlO
2+H
2O
tSiO
2+2KOHK
2O·（SiO
2）
t↓+H
2O
3FeS
2+6KOH3FeS↓+K
2SO
3+2K
2S+3H
2O
4FeS
2+11O
22Fe
2O
3+8SO
2
4FeO+O
2 2Fe
2O
3
2SO
2+O
2+4KOH
2K
2SO
4+2H
2O
2) desliming
Alkali leaching cake A in step 1) is added water be mixed with mass concentration be 22% the ore pulp desliming bucket that feeds ∮ 3.0 meters carry out desliming operation, obtain sand setting B and overflow C;
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 D and magnetic tailing E;
The ore pulp making mass concentration 38% that added water by magnetic tailing E again carries out gravity treatment, respectively gravity concentrate F and gravity tailings G, described magnetic concentrate D to be TFe content range be 67.3% final iron ore concentrate, wherein SiO
2content is 0.52%, Al
2o
3content is 1.69%, S content is 0.01%; Gravity concentrate F and overflow C merges into TiO
2content is the final ilmenite concentrate of 61.0%, and gravity tailings G is true tailings.
In the method, the reaction 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 final 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 54.8%, TiO by TFe content
2content is 10.3%, SiO
2content is 3.82%, Al
2o
3content is 4.78%, the v-ti magnetite concentrate of S content 0.68%, is placed in the KOH alkaline solution that mass concentration is 30%, adds 58kg/t
to ore deposith
2o
2, then at the temperature of 280 DEG C, alkali soaks reaction 2.0 hours, and filtered by reactant, obtain filtrate and alkali leaching cake A, KOH consumption 89.7kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is:
2mFeTiO
3+4KOH+mH
2O
2mFe
2O
3↓+2K
2O·(TiO
2)
m↓+(m+2)H
2Om≥1
pFe
3O
4·q（FeO·TiO
2)+2rKOHpFe
3O
4↓+qFeO↓+(K
2O)
r·(TiO
2)
q↓+rH
2O
Al
2O
3+2KOH2KAlO
2+H
2O
tSiO
2+2KOHK
2O·(SiO
2)
t↓+H
2O
3FeS
2+6KOH3FeS↓+K
2SO
3+2K
2S+3H
2O
2FeS
2+11H
2O
2Fe
2O
3+4SO
2+11H
2O
2FeO+H
2O
2Fe
2O
3+H
2O
SO
2+H
2O
2+2KOHK
2SO
4+2H
2O
2) desliming
Alkali leaching cake A in step 1) is added water be mixed with mass concentration be 25% the ore pulp desliming bucket that feeds ∮ 5.0 meters carry out desliming operation, obtain sand setting B and overflow C;
3) magnetic reconnection closes ore dressing
By step 2) in sand setting B add water that to feed field intensity be that the magnetic dewater cone of 0.03T carries out a stages of magnetic separation for the ore pulp of making mass concentration 30%, obtain an a magnetic essence D1 and magnetic tail E1 respectively; Two stages of magnetic separation are carried out to the drum magnetic separator that the ore pulp employing field intensity of a magnetic essence D1 mass concentration 34% is 0.13T, obtains two magnetic essence D2 bis-magnetic tail E2 respectively;
The spiral chute ore pulp of two magnetic tail E2 mass concentrations 38% being fed ￠ 0.9 meter again carries out gravity treatment, obtains gravity concentrate F and gravity tailings G respectively, described two magnetic essence D2 and gravity concentrate F to be TFe content be 68.2% final iron ore concentrate, wherein SiO
2content is 0.34%, Al
2o
3content is 1.28%, S content is 0.01%; One magnetic tail E1 and overflow C merges into TiO
2content is the ilmenite concentrate of 56.1%, and described gravity tailings G is true tailings.
In the method, the reaction 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 50.2%, TiO by TFe content
2content is 14.8%, SiO
2content is 3.70%, Al
2o
3content is 4.69%, the v-ti magnetite concentrate of S content 0.63%, is placed in that NaOH mass concentration is 22%, KOH mass concentration is the mixed aqueous solution of 7%, passes into the O of 116psi
2, then at the temperature of 230 DEG C, alkali soaks reaction 1.5 hours, is filtered by reactant, filtrate and alkali leaching cake A, NaOH consumption 33.5kg/t to ore deposit, KOH consumption 47.6kg/t is to ore deposit, described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1 and embodiment 5;
2) desliming
Alkali leaching cake A in step 1) is added water be mixed with mass concentration be 23% the ore pulp desliming bucket that feeds ∮ 5.0 meters carry out desliming operation, obtain sand setting B and overflow C;
3) magnetic reconnection closes ore dressing
By step 2) in sand setting B add water that to feed field intensity be that the magnetic dewater cone of 0.03T carries out a stages of magnetic separation for the ore pulp of making mass concentration 32%, obtain an a magnetic essence D1 and magnetic tail E1 respectively; Two stages of magnetic separation are carried out to the drum magnetic separator that the ore pulp employing field intensity of a magnetic essence D1 mass concentration 33% is 0.13T, obtains two magnetic essence D2 bis-magnetic tail E2 respectively;
The spiral chute ore pulp of two magnetic tail E2 mass concentrations 40% being fed ￠ 0.9 meter again carries out gravity treatment, obtains gravity concentrate F and gravity tailings G respectively, described two magnetic essence D2 and gravity concentrate F to be TFe content be 66.0% final iron ore concentrate, wherein SiO
2content is 0.53%, Al
2o
3content is 1.33%, S content is 0.01%; One magnetic tail E1 and overflow C merges into TiO
2content is the ilmenite concentrate of 56.8%, and described gravity tailings G is true tailings.
In the method, the reaction product of alkali oxide leaching is the mixture of potassium titanate and sodium titanate, and the overall yield of potassium titanate and sodium titanate is greater than 100kg/T raw ore, and potassium titanate and sodium titanate are present in final product ilmenite concentrate.
Embodiment 8:
As shown in Figure 2.
1) alkali oxide leaching
Be 51.0%, TiO by TFe content
2content is 13.8%, SiO
2content is 4.10%, Al
2o
3content is 4.78%, the v-ti magnetite concentrate of S content 0.69%, is placed in that NaOH mass concentration is 20%, KOH mass concentration is the mixed aqueous solution of 6%, adds 197kg/t
to ore deposith
2o
2, then at the temperature of 230 DEG C, alkali soaks reaction 1.5 hours, is filtered by reactant, filtrate and alkali leaching cake A, NaOH consumption 30.5kg/t to ore deposit, KOH consumption 45.4kg/t is to ore deposit, described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 3 and embodiment 6;
2) desliming
Alkali leaching cake A in step 1) is added water be mixed with mass concentration be 23% the ore pulp desliming bucket that feeds ∮ 5.0 meters carry out desliming operation, obtain sand setting B and overflow C;
3) magnetic reconnection closes ore dressing
By step 2) in sand setting B add water that to feed field intensity be that the magnetic dewater cone of 0.03T carries out a stages of magnetic separation for the ore pulp of making mass concentration 32%, obtain an a magnetic essence D1 and magnetic tail E1 respectively; Two stages of magnetic separation are carried out to the drum magnetic separator that the ore pulp employing field intensity of a magnetic essence D1 mass concentration 33% is 0.13T, obtains two magnetic essence D2 bis-magnetic tail E2 respectively;
The spiral chute ore pulp of two magnetic tail E2 mass concentrations 39% being fed ￠ 0.9 meter again carries out gravity treatment, obtains gravity concentrate F and gravity tailings G respectively, described two magnetic essence D2 and gravity concentrate F to be TFe content be 65.4% final iron ore concentrate, wherein SiO
2content is 0.62%, Al
2o
3content is 1.28%, S content is 0.01%; One magnetic tail E1 and overflow C merges into TiO
2content is the ilmenite concentrate of 60.1%, and described gravity tailings G is true tailings.
In the method, the reaction product of alkali oxide leaching is the mixture of potassium titanate and sodium titanate, and the overall yield of potassium titanate and sodium titanate is greater than 100kg/T raw ore, and potassium titanate and sodium titanate are present in final product ilmenite concentrate.
Claims (8)
1. utilize alkali oxide leaching, desliming 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 alkaline solution that mass concentration is 5% ~ 52%, add oxygenant, 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) desliming
Alkali leaching cake A in step 1) is added water be mixed with mass concentration be 21% ~ 25% ore pulp carry out desliming operation, obtain sand setting B and overflow C;
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 D and magnetic tailing E;
The ore pulp making mass concentration 36% ~ 41% that added water by magnetic tailing E again carries out gravity treatment, respectively gravity concentrate F and gravity tailings G, described magnetic concentrate D to be TFe content range be 65% ~ 70% final iron ore concentrate, gravity concentrate F and overflow C merges into TiO
2content range is the final ilmenite concentrate of 50% ~ 70%, and gravity tailings G is true tailings.
2. according to claim 1ly utilize that alkali oxide soaks, desliming and magnetic reconnection close the method selecting v-ti magnetite concentrate again, it is characterized in that described alkaline solution is any one in the NaOH aqueous solution, the KOH aqueous solution or NaOH and KOH mixed aqueous solution.
3. alkali oxide leaching, desliming 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 oxygenant is O
2or H
2o
2, described O
2add-on is 20 ~ 120psi, H
2o
2add-on is 50 ~ 200kg/t
to ore deposit.
4. alkali oxide leaching, desliming 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 desliming operation adopts the desliming bucket of ∮ 3 ~ 5 meters to carry out desliming operation.
5. alkali oxide leaching, desliming 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.
6. alkali oxide leaching, desliming 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.
7. alkali oxide leaching, desliming 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.
8. alkali oxide leaching, desliming 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.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107400786A (en) * | 2017-07-04 | 2017-11-28 | 鞍钢集团矿业有限公司 | A kind of method that aluminium is carried from low-grade laterite iron ore |
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| 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 |
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