CN103962220B - Alkali leaching, pickling, desliming and heavy magnetic associating is utilized to select v-ti magnetite concentrate method again - Google Patents

Alkali leaching, pickling, desliming and heavy magnetic associating is utilized to select v-ti magnetite concentrate method again Download PDF

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CN103962220B
CN103962220B CN201410164253.2A CN201410164253A CN103962220B CN 103962220 B CN103962220 B CN 103962220B CN 201410164253 A CN201410164253 A CN 201410164253A CN 103962220 B CN103962220 B CN 103962220B
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concentrate
magnetic
pickling
alkali leaching
desliming
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CN103962220A (en
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宋仁峰
马普生
朱大鹏
曹新全
韩晓东
李化
陈巍
赵亮
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Angang Group Mining Co Ltd
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Abstract

The open one of the present invention utilizes alkali leaching, pickling, desliming and heavy magnetic associating to select v-ti magnetite concentrate method again, comprise the steps: v-ti magnetite concentrate to be placed in the aqueous slkali that mass concentration is 5 ~ 52%, alkali leaching reaction 0.5 ~ 5 hour at 280 ~ 370 DEG C, filter, obtain filtrate and alkali leaching cake A; A is added water and is mixed with the ore pulp that solid-liquid mass ratio is 1: 1 ~ 10, then be placed in H 2sO 4in solution, pickling 5 ~ 60 minutes at 50 DEG C ~ 90 DEG C, filters, obtains filtrate and acidleach filter cake B; Again acidleach filter cake B is carried out desliming operation, obtain sand setting C and overflow D, the ore pulp being made into mass concentration 30% ~ 41% that added water by sand setting C carries out weight magnetic beneficiation combined method, obtains final iron ore concentrate and TiO that TFe content range is 63% ~ 69% 2content range is the ilmenite concentrate of 60% ~ 82%.Advantage of the present invention is: achieve and efficiently sort v-ti magnetite concentrate, reduces and enters the impurity contents such as blast furnace Al and Si, improves the capacity factor of a blast furnace, improves titanium resource comprehensive utilization ratio simultaneously.

Description

Alkali leaching, pickling, desliming and heavy magnetic associating is utilized to select v-ti magnetite concentrate method again
Technical field
The present invention relates to a kind of ore-dressing technique of v-ti magnetite concentrate, particularly relate to one and utilize alkali leaching, pickling, desliming and heavy magnetic associating to select v-ti magnetite concentrate method 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 0.278
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.
CN201310183580.8 discloses " a kind of wet-treating sefstromite concentrate prepares the method for titanium liquid ", proposes the method with salt pickling separating titanium iron.This invention is the method that wet-treating 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.
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 v-ti magnetite concentrate method is selected in utilize alkali leaching, pickling, desliming and the heavy magnetic associating of good operability 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
One of the present invention utilizes alkali leaching, pickling, desliming and heavy magnetic associating to select v-ti magnetite concentrate method again, it is characterized in that comprising the steps:
1) alkali 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%, alkali leaching reaction 0.5 ~ 5 hour at the temperature of 280 DEG C ~ 370 DEG C, reactant is filtered, obtain filtrate and alkali leaching cake A, described filtrate feeds recovery and processing system;
2) pickling
By step 1) in alkali leaching cake A add water and make the ore pulp that solid-liquid mass ratio is 1:1 ~ 10, then be placed in the H that mass concentration is 1% ~ 10% 2sO 4in solution, under 50 DEG C ~ 90 DEG C conditions, pickling 5 ~ 60 minutes, filters pickling reactant, and obtain filtrate and acidleach filter cake B, described filtrate feeds recovery and processing system;
3) desliming
By step 2) in acidleach filter cake B add water and be mixed with the ore pulp that mass concentration is 21% ~ 25%, carry out desliming operation with the desliming bucket of ∮ 3.0 ~ 5.0 meters, obtain sand setting C and overflow D;
4) heavy magnetic beneficiation combined method
By step 3) in the sand setting C ore pulp being made into mass concentration 36% ~ 41% that adds water carry out gravity treatment, obtain gravity concentrate E and gravity tailings F; The ore pulp being mixed with mass concentration 30% ~ 34% that added water by gravity tailings F again carries out magnetic separation, obtains magnetic concentrate G and magnetic tailing H;
Described gravity concentrate E and magnetic concentrate G merges into the final iron ore concentrate that TFe content range is 63% ~ 69%, and described magnetic tailing H and overflow D merges into TiO 2content range is the final ilmenite concentrate of 60% ~ 82%.
Described aqueous slkali is any one in NaOH or the KOH aqueous solution, NaOH and KOH mixed aqueous solution.
Described gravity treatment adopts 0.6 ~ the spiral chute of 1.2 meters carries out gravity treatment.
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.
Advantage of the present invention is:
V-ti magnetite concentrate method process v-ti magnetite concentrate is selected in method integrated use alkali of the present invention leaching, pickling, desliming and the associating of heavy magnetic again, achieves titanium in v-ti magnetite concentrate, iron is efficiently separated; 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 3%, Al by 3% ~ 6% 2o 3content is down to less than 3% by 3% ~ 6%, for subsequent smelting creates better condition.
The process of alkali leaching has carried out chemical reaction to elements such as Ti, S, Si, Al in v-ti magnetite concentrate, defines corresponding salt.With v-ti magnetite concentrate unlike, SiO in ilmenite raw ore 2content (>20%) and Al 2o 3content (>7%) is far away higher than SiO in v-ti magnetite concentrate 2content (<6%) and Al 2o 3content (<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 ferrotianium raw ore alkali consumption, better effects if.Such as, when soaking with NaOH alkali, the alkali number that the present invention consumes is less than 100kg/t concentrate, reduces more than 4.6 times than the alkali number 469kg/t raw ore of alkali leaching raw ore consumption.
Acid cleaning process has dissolved oxysalt and the sulfide such as Ti, Si, Al after alkali leaching effectively, makes it to dissociate with iron ore concentrate.In addition because the present invention adopts sulfuric acid to carry out pickling, reaction condition is gentle, and little to equipment corrosion, cost is low, is more conducive to suitability for industrialized production.
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 titanium, iron is comparatively large, achieves effective separation of titanium, iron.
Add heavy magnetic beneficiation combined method, make iron concentrate grade bring up to 63% ~ 69% by 50% ~ 55%, be less than 0.1%, SiO containing S amount in iron ore concentrate simultaneously 2and Al 2o 3content is all less than 3%, TiO 2content is down to less than 6% by 12%; Meanwhile, TiO can also be obtained 2content is the ilmenite concentrate of 60% ~ 82%.Adopt the method, achieve and titanium, iron are effectively separated, 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 titanium resource comprehensive utilization ratio 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 process chart that the present invention adopts another embodiment of two stages of magnetic separation.
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 leaching
Be 51.3%, TiO by TFe content 2content is 13.7%, SiO 2content is 4.55%, Al 2o 3content is 4.71%, the v-ti magnetite concentrate of S content 0.79%, be placed in the NaOH aqueous slkali that mass concentration is 15%, alkali leaching reaction 1.5 hours at the temperature of 300 DEG C, reactant is filtered, obtain filtrate and alkali leaching cake A, NaOH consumption 72kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is:
2) pickling
By step 1) in alkali leaching cake A add water and make the ore pulp that quality solid-to-liquid ratio is 1: 1.5, then be placed in the H that mass concentration is 2% 2sO 4in solution, 70 DEG C of pickling 8 minutes, filtered by pickling reactant, obtain filtrate and acidleach filter cake B, described filtrate feeds recovery and processing system, and its chemical equation is:
3) desliming
By step 2) in acidleach filter cake B add water and be mixed with the ore pulp that mass concentration is 21%, carry out desliming operation with the desliming bucket of ∮ 3.0 meters, obtain sand setting C and overflow D;
4) heavy magnetic beneficiation combined method
By step 3) in the sand setting C ore pulp being made into mass concentration 36% that adds water feed the spiral chute of 1.2 meters carries out gravity treatment, obtains gravity concentrate E and gravity tailings F;
The drum magnetic separator that the ore pulp that is mixed with mass concentration 33% of being added water by gravity tailings F again carries out feeding 0.15T carries out magnetic separation, obtains magnetic concentrate G and magnetic tailing H;
Described gravity concentrate E and magnetic concentrate G merges into the final iron ore concentrate (SiO that TFe content is 63.5% 2content is 1.05%, Al 2o 3content is 1.07%, S content is 0.02%), described magnetic tailing H and overflow D merges into TiO 2content is the ilmenite concentrate of 62.3%.
Embodiment 2:
As shown in Figure 1.
1) alkali leaching
Be 51.1%, TiO by TFe content 2content is 14.2%, SiO 2content is 3.95%, Al 2o 3content is 4.19%, the v-ti magnetite concentrate of S content 0.58%, be placed in the NaOH aqueous slkali that mass concentration is 25%, alkali leaching reaction 2.5 hours at the temperature of 360 DEG C, reactant is filtered, obtain filtrate and alkali leaching cake A, NaOH consumption 82kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1.
2) pickling
By step 1) in alkali leaching cake A add water and make the ore pulp that quality solid-to-liquid ratio is 1:2.6, then be placed in the H that mass concentration is 3% 2sO 4in solution, 75 DEG C of pickling 60 minutes, filtered by pickling reactant, obtain filtrate and acidleach filter cake B, described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1.
3) desliming
By step 2) in filtration after concentrated ilmenite B add water and be mixed with the ore pulp that mass concentration is 21%, carry out desliming operation with the desliming bucket of ∮ 5.0 meters, obtain sand setting C and overflow D;
4) heavy magnetic beneficiation combined method
By step 3) in the sand setting C ore pulp being made into mass concentration 37% that adds water feed the spiral chute of 0.6 meter carries out gravity treatment, obtains gravity concentrate E and gravity tailings F;
The drum magnetic separator that the ore pulp that is mixed with mass concentration 32% of being added water by gravity tailings F again carries out feeding 0.12T carries out magnetic separation, obtains magnetic concentrate G and magnetic tailing H;
Described gravity concentrate E and magnetic concentrate G merges into the final iron ore concentrate (SiO that TFe content is 68.5% 2content is 0.35%, Al 2o 3content is 0.37%, S content is 0.01%), described magnetic tailing H and overflow D merges into TiO 2content is the ilmenite concentrate of 65.7%.
Embodiment 3:
As shown in Figure 1.
1) alkali leaching
Be 52.1%, TiO by TFe content 2content is 12.6%, SiO 2content is 3.05%, Al 2o 3content is 5.31%, the v-ti magnetite concentrate of S content 0.70%, be placed in the NaOH aqueous slkali that mass concentration is 32%, alkali leaching reaction 3.5 hours at the temperature of 310 DEG C, reactant is filtered, obtain filtrate and alkali leaching cake A, NaOH consumption 85kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1.
2) pickling
By step 1) in alkali leaching cake A add water and make the ore pulp that quality solid-to-liquid ratio is 1:3.8, then be placed in the H that mass concentration is 5% 2sO 4in solution, 50 DEG C of pickling 50 minutes, filtered by pickling reactant, obtain filtrate and acidleach filter cake B, described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1.
3) desliming
By step 2) in filtration after concentrated ilmenite B add water and be mixed with the ore pulp that mass concentration is 25%, carry out desliming operation with the desliming bucket of ∮ 5.0 meters, obtain sand setting C and overflow D.
4) heavy magnetic beneficiation combined method
By step 3) in the sand setting C ore pulp being made into mass concentration 40% that adds water feed the spiral chute of 0.9 meter carries out gravity treatment, obtains gravity concentrate E and gravity tailings F;
It is that the magnetic dewater cone of 0.03T carries out magnetic separation that the ore pulp that is mixed with mass concentration 30% of being added water by gravity tailings F again feeds field intensity, obtains magnetic concentrate G and magnetic tailing H;
Described gravity concentrate E and magnetic concentrate G merges into the final iron ore concentrate (SiO that TFe content is 64.3% 2content is 0.75%, Al 2o 3content is 0.97%, S content is 0.02%), described magnetic tailing H and overflow D merges into TiO 2content is the ilmenite concentrate of 63.6%.
Embodiment 4:
As shown in Figure 1.
1) alkali leaching
Be 53.5%, TiO by TFe content 2content is 11.6%, SiO 2content is 3.95%, Al 2o 3content is 4.91%, the v-ti magnetite concentrate of S content 0.69%, be placed in the NaOH aqueous slkali that mass concentration is 40%, alkali leaching reaction 4.5 hours at the temperature of 330 DEG C, reactant is filtered, obtain filtrate and alkali leaching cake A, NaOH consumption 89kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1.
2) pickling
By step 1) in alkali leaching cake A add water and make the ore pulp that quality solid-to-liquid ratio is 1:8.2, be placed in the H2SO4 solution that mass concentration is 6% again, 65 DEG C of pickling 22 minutes, pickling reactant is filtered, obtain filtrate and acidleach filter cake B, described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1.
3) desliming
By step 2) in filtration after concentrated ilmenite B add water and be mixed with the ore pulp that mass concentration is 24%, carry out desliming operation with the desliming bucket of ∮ 3.0 meters, obtain sand setting C and overflow D.
4) heavy magnetic beneficiation combined method
By step 3) in the sand setting C ore pulp being made into mass concentration 39% that adds water feed the spiral chute of 1.2 meters carries out gravity treatment, obtains gravity concentrate E and gravity tailings F; Gravity tailings F is added water and forms the ore pulp of mass concentration 31% to feed field intensity be that the magnetic dewater cone of 0.05T carries out magnetic separation, obtain magnetic concentrate G and magnetic tailing H;
Described gravity concentrate E and magnetic concentrate G merges into the final iron ore concentrate (SiO that TFe content is 65.8% 2content is 0.65%, Al 2o 3content is 0.57%, S content is 0.01%), described magnetic tailing H and overflow D merges into TiO 2content is the ilmenite concentrate of 70.5%.
Embodiment 5:
As shown in Figure 2.
1) alkali leaching
Be 53.8%, TiO by TFe content 2content is 11.6%, SiO 2content is 3.75%, Al 2o 3content is 4.96%, the v-ti magnetite concentrate of S content 0.68%, be placed in the KOH aqueous slkali that mass concentration is 30%, alkali leaching reaction 5 hours at the temperature of 290 DEG C, reactant is filtered, obtain filtrate and alkali leaching cake A, KOH consumption 96kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is:
2) pickling
By step 1) in alkali leaching cake A add water and make the ore pulp that quality solid-to-liquid ratio is 1:8, then be placed in the H that mass concentration is 6% 2sO 4in solution, 80 DEG C of pickling 22 minutes, filtered by pickling reactant, obtain filtrate and acidleach filter cake B, described filtrate feeds recovery and processing system, and its chemical equation is:
3) desliming
By step 2) in filtration after concentrated ilmenite B add water and be mixed with the ore pulp that mass concentration is 24%, carry out desliming operation with the desliming bucket of ∮ 5.0 meters, obtain sand setting C and overflow D.
4) heavy magnetic beneficiation combined method
By step 3) in the sand setting C ore pulp being made into mass concentration 41% that adds water feed the spiral chute of 0.6 meter carries out gravity treatment, obtains gravity concentrate E and gravity tailings F; Gravity tailings F is added water and forms the ore pulp of mass concentration 34% to feed field intensity be that the drum magnetic separator of 0.12T carries out a stages of magnetic separation, obtain an a stages of magnetic separation concentrate G1 and stages of magnetic separation mine tailing H1; By concentration be again 31% a stages of magnetic separation concentrate G1 field intensity be that the magnetic dewater cone of 0.03T carries out two stages of magnetic separation, respectively two stages of magnetic separation concentrate G2 and two stages of magnetic separation mine tailing H2;
Described gravity concentrate E and magnetic concentrate G2 merges into the final iron ore concentrate (SiO that TFe content is 67.8% 2content is 0.45%, Al 2o 3content is 0.37%, S content is 0.01%), described magnetic tailing H1 and H2 merges into final mine tailing, and overflow D is TiO 2content is the final ilmenite concentrate of 81.5%.
Embodiment 6:
As shown in Figure 3.
1) alkali leaching
Be 51.1%, TiO by TFe content 2content is 13.9%, SiO 2content is 4.15%, Al 2o 3content is 4.90%, the v-ti magnetite concentrate of S content 0.78%, be placed in the KOH aqueous slkali that mass concentration is 6%, alkali leaching reaction 1 hour at the temperature of 295 DEG C, reactant is filtered, obtain filtrate and alkali leaching cake A, KOH consumption 86kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 5.
2) pickling
By step 1) in alkali leaching cake A add water and make the ore pulp that quality solid-to-liquid ratio is 1:9, then be placed in the H that mass concentration is 7% 2sO 4in solution, 75 DEG C of pickling 30 minutes, filtered by pickling reactant, obtain filtrate and acidleach filter cake B, described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 5.
3) desliming
By step 2) in filtration after concentrated ilmenite B add water and be mixed with the ore pulp that mass concentration is 22%, carry out desliming operation with the desliming bucket of ∮ 3.0 meters, obtain sand setting C and overflow D.
4) heavy magnetic beneficiation combined method
By step 3) in the sand setting C spiral chute that the ore pulp that is made into mass concentration 38% feeds ¢ 0.9 meter that adds water carry out gravity treatment, obtain gravity concentrate E and gravity tailings F; Being added water by gravity tailings F and forming the ore pulp field intensity of mass concentration 31% is that the magnetic dewater cone of 0.05T carries out a stages of magnetic separation, obtains an a stages of magnetic separation concentrate G1 and stages of magnetic separation mine tailing H1; By concentration be again 33% a stages of magnetic separation concentrate G1 to feed field intensity be that 0.15T drum magnetic separator carries out two stages of magnetic separation, respectively two stages of magnetic separation concentrate G2 and two stages of magnetic separation mine tailing H2;
Described gravity concentrate E and magnetic concentrate G2 merges into the final iron ore concentrate (SiO that TFe content is 65.3% 2content is 0.40%, Al 2o 3content is 0.21%, S content is 0.01%), described magnetic tailing H1 and H2 merges into final mine tailing, and overflow D is TiO 2content is the final ilmenite concentrate of 66.5%.
Embodiment 7:
As shown in Figure 3.
1) alkali leaching
Be 51.6%, TiO by TFe content 2content is 13.2%, SiO 2content is 4.21%, Al 2o 3content is 4.88%, the v-ti magnetite concentrate of S content 0.77%, be placed in that NaOH mass concentration is 20%, KOH mass concentration is the aqueous slkali of 5%, alkali leaching reaction 2 hours at the temperature of 290 DEG C, reactant is filtered, filtrate and alkali leaching cake A, NaOH consumption 30kg/t to ore deposit, KOH consumption 50kg/t is to ore deposit, described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1 and embodiment 5.
2) pickling
By step 1) in alkali leaching cake A add water and make the ore pulp that quality solid-to-liquid ratio is 1:8, then be placed in the H that mass concentration is 8% 2sO 4in solution, 85 DEG C of pickling 30 minutes, filtered by pickling reactant, obtain filtrate and acidleach filter cake B, described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1 and embodiment 5.
3) desliming
By step 2) in filtration after concentrated ilmenite B add water and be mixed with the ore pulp that mass concentration is 21%, carry out desliming operation with the desliming bucket of ∮ 3.0 meters, obtain sand setting C and overflow D.
4) heavy magnetic beneficiation combined method
By step 3) in the sand setting C ore pulp being made into mass concentration 39% that adds water feed the spiral chute of 0.9 meter carries out gravity treatment, obtains gravity concentrate E and gravity tailings F; Being added water by gravity tailings F and forming the ore pulp field intensity of mass concentration 30% is that the magnetic dewater cone of 0.05T carries out a stages of magnetic separation, obtains an a stages of magnetic separation concentrate G1 and stages of magnetic separation mine tailing H1; By concentration be again 32% a stages of magnetic separation concentrate G1 to feed field intensity be that 0.15T drum magnetic separator carries out two stages of magnetic separation, respectively two stages of magnetic separation concentrate G2 and two stages of magnetic separation mine tailing H2;
Described gravity concentrate E and magnetic concentrate G2 merges into the final iron ore concentrate (SiO that TFe content is 65.0% 2content is 0.42%, Al 2o 3content is 0.19%, S content is 0.01%), described magnetic tailing H1 and H2 merges into final mine tailing, and overflow D is TiO 2content is the final ilmenite concentrate of 66.9%.

Claims (6)

1. utilize alkali leaching, pickling, desliming and heavy magnetic associating to select a v-ti magnetite concentrate method again, it is characterized in that comprising the steps:
1) alkali 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%, alkali leaching reaction 0.5 ~ 5 hour at the temperature of 280 DEG C ~ 370 DEG C, reactant is filtered, obtain filtrate and alkali leaching cake A, described filtrate feeds recovery and processing system;
2) pickling
By step 1) in alkali leaching cake A add water and make the ore pulp that solid-liquid mass ratio is 1: 1 ~ 10, then be placed in the H that mass concentration is 1% ~ 10% 2sO 4in solution, under 50 ~ 90 DEG C of conditions, pickling 5 ~ 60 minutes, filters pickling reactant, and obtain filtrate and acidleach filter cake B, described filtrate feeds recovery and processing system;
3) desliming
By step 2) in acidleach filter cake B add water and be mixed with the ore pulp that mass concentration is 21% ~ 25%, carry out desliming operation with the desliming bucket of ∮ 3.0 ~ 5.0 meters, obtain sand setting C and overflow D;
4) heavy magnetic beneficiation combined method
By step 3) in the sand setting C ore pulp being made into mass concentration 36% ~ 41% that adds water carry out gravity treatment, obtain gravity concentrate E and gravity tailings F; The ore pulp being mixed with mass concentration 30% ~ 34% that added water by gravity tailings F again carries out magnetic separation, obtains magnetic concentrate G and magnetic tailing H;
Described gravity concentrate E and magnetic concentrate G merges into the final iron ore concentrate that TFe content range is 63% ~ 69%, and described magnetic tailing H and overflow D merges into TiO 2content range is the final ilmenite concentrate of 60% ~ 82%.
2. according to claim 1ly utilize alkali leaching, pickling, desliming and the associating of heavy magnetic to select v-ti magnetite concentrate method again, it is characterized in that described aqueous slkali is any one in NaOH or the KOH aqueous solution, NaOH and KOH mixed aqueous solution.
3. according to claim 1ly utilize alkali leaching, pickling, desliming and the associating of heavy magnetic to select v-ti magnetite concentrate method again, it is characterized in that described gravity treatment adopts 0.6 ~ the spiral chute of 1.2 meters carries out gravity treatment.
4. according to claim 1ly utilize alkali leaching, pickling, desliming and the associating of heavy magnetic to select v-ti magnetite concentrate method 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. according to claim 1ly utilize alkali leaching, pickling, desliming and the associating of heavy magnetic to select v-ti magnetite concentrate method 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. according to claim 1ly utilize alkali leaching, pickling, desliming and the associating of heavy magnetic to select v-ti magnetite concentrate method 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.
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