CN103962218B - Utilize calcining, alkali leaching, desliming and heavily select the method selecting v-ti magnetite concentrate again - Google Patents

Utilize calcining, alkali leaching, desliming and heavily select the method selecting v-ti magnetite concentrate again Download PDF

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CN103962218B
CN103962218B CN201410164174.1A CN201410164174A CN103962218B CN 103962218 B CN103962218 B CN 103962218B CN 201410164174 A CN201410164174 A CN 201410164174A CN 103962218 B CN103962218 B CN 103962218B
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heavily
concentrate
content
desliming
alkali leaching
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CN103962218A (en
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王俊山
刘炳宇
刘晓明
郭客
陈巍
王忠红
彭磊
宋仁峰
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Angang Group Mining Co Ltd
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Abstract

The present invention discloses and a kind of utilizes calcining, alkali leaching, desliming and heavily select the method selecting v-ti magnetite concentrate again, comprises the steps: v-ti magnetite concentrate is added CaO, carries out calcining 20��60 minutes at the temperature of 800 DEG C��1400 DEG C, forms calcination product A; Product A is placed in the alkaline solution alkali leaching reaction 0.5��5 hour that mass concentration is 5%��52%, filter, obtain filtrate and alkali leaching cake B, the preparation ore pulp that added water by B carries out desliming operation, obtains heavy sand C and overflow D, is added water by heavy sand C and make ore pulp and heavily select, obtain heavy concentrate selection E respectively, heavily select mine tailing F and heavily choose ore deposit G, heavy concentrate selection E is final iron ore concentrate, heavily selects mine tailing F to be true tailings, heavily chooses ore deposit G and overflow D to merge into final ilmenite concentrate. It is an advantage of the invention that: reducing NaOH or KOH consumption, it is achieved that efficiently sorted by v-ti magnetite concentrate, alkaline consumption is low, reduce and enter the foreign matter contents such as blast furnace Al and Si, it is to increase the capacity factor of a blast furnace, improve titanium resource comprehensive utilization ratio simultaneously.

Description

Utilize calcining, alkali leaching, desliming and heavily select the method selecting v-ti magnetite concentrate again
Technical field
The present invention relates to the ore-dressing technique of a kind of v-ti magnetite concentrate, particularly relate to and a kind of utilize calcining, alkali leaching, desliming and heavily select the method selecting v-ti magnetite concentrate again.
Background technology
Vanadium titano-magnetite is the complex ore of a kind of multiple metallic element, is the magnetite of the symbiosis based on 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 high price iron ion. Titanomagnetite is oikocryst mineral (Fe3O4) and chadacryst ore deposit [ulvite 2FeO TiO2, ilmenite FeO TiO2, aluminum-spinel (Mg, Fe) (Al, Fe)2O4] complex body that formed. Such as, China's Panzhihua Region Midi Concentrator v-ti magnetite green ore and the v-ti magnetite concentrate chemistry multielement analysis after selecting iron 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 China's Panzhihua Region Midi Concentrator raw ore and v-ti magnetite concentrate chemistry multielement analysis result
Element TFe FeO mFe S Fe2O3 TiO2 V2O5
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 SiO2 Al2O3 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 China Panzhihua Region Midi Concentrator v-ti magnetite green ore titanium, iron chemical phase analysis result
Table 3 China Panzhihua Region Midi Concentrator vanadium titano-magnetite concentrate titanium, iron chemical phase analysis result
V-ti magnetite ore resources enriches in the world, and 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 ore2Main tax is stored in granular ilmenite and titanomagnetite. Generally, the titanium of about 57% is composed and is stored in titanomagnetite (mFeTiO3��nFe3O4) in, the titanium of about 40% is composed and is stored in ilmenite (FeTiO3) in, owing to vanadium titano-magnetite ore composition is complicated, character is special, and thus the comprehensive utilization of this kind of ore is the international big difficult problem always thoroughly not solved. This kind of 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 process2Content reaches more than 22%) form vitreum, TiO2Lose activity and cannot economic recovery, meanwhile, titanium recovery rate is low by only 18%. Therefore sort, by the beneficiation method of physics, the value that titanium iron ore greatly reduces titanium and iron utilizes separately.
China be in the world first from complicated vanadium titano-magnetite, comprehensively extract the country of iron, vanadium, titanium with technical scale, but due to general physical method can not fundamentally change iron, the tax of the fine and close symbiosis of titanium deposit characteristic, therefore, the physical concentration methods such as common gravity separation method, magnetic method, flotation process are adopted to carry out titanium, iron separation, efficiency is low, it is very difficult to select of high grade and ilmenite concentrate that impurity is few or iron ore concentrate; Meanwhile, TiO2Organic efficiency is not high, v-ti magnetite green ore after Mineral separation, the TiO of about 54%2Enter iron ore concentrate, these TiO2After blast-furnace smelting, almost all enter slag phase, form TiO2The blast furnace slag of content 20��24%; In addition, owing to 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 big, titanium resource waste, and amount of slag is big, environmental pollution is serious.
CN2011100879566 discloses " beneficiation method of a kind of ilmenite ", is that 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 TiO2The v-ti magnetite green ore of 12.11%, by the process of magnetic separation after ore grinding, alkaline pretreatment, filtration, again ore grinding, defines iron content 59.30% iron ore concentrate and contains TiO2The ilmenite concentrate of 20.15%. Owing to the method is for ilmenite raw ore, raw ore SiO2��Al2O3, the gangue mineral content height such as CaO, MgO, the process of alkali leaching will preferentially occur in SiO2��Al2O3With it mineral, defining the alkali leaching rear compound similar to titanium in the dipped journey of alkali, the NaOH alkali amount of alkali leaching ferrotianium raw ore consumption is 469Kg/t raw ore, cost height; 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 separation 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, complicated by this kind of method process, and in treating processes, quantity of alkali consumption is big, cost height; Meanwhile, more high-grade iron ore concentrate and ilmenite concentrate cannot be obtained.
CN201310183580.8 discloses " a kind of method that wet processing sefstromite concentrate prepares titanium liquid ", it is proposed that by the method for 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, hydrochloric acid leaching process needs dissolve in filtrate with hydrochloric acid and iron and vanadium reaction, consume a large amount of hydrochloric acid, cost height; Meanwhile, fused salt process consumes alkali with NaOH and titanium and pasc reaction. In addition, owing to employing hydrochloric acid in the method leaching process, in hydrochloric acid, chlorion is big 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 that a kind of cost is low, utilization calcining, alkali leaching, the desliming of reclaiming quality and efficiency height and good operability and heavily select the method selecting v-ti magnetite concentrate again, achieve and titanium in v-ti magnetite concentrate, iron are carried out high efficiency separation, improve into stokehold Iron grade, reduce and enter blast furnace TiO2, the impurity such as S, Si, Al content, it is to increase the capacity factor of a blast furnace, reduce the quantity discharged of blast furnace slag, reduce ironmaking cost, it is to increase TiO2Comprehensive resource utilization rate, reduces NaOH or KOH consumption simultaneously, decreases environmental pollution.
In order to realize the object of the present invention, the technical scheme of the present invention is achieved in that
The a kind of of the present invention utilizes calcining, alkali leaching, desliming and heavily selects the method selecting v-ti magnetite concentrate again, it is characterised in that comprise the steps:
1) calcine
By TFeContent range is 50%��55%, TiO2Content range is 10%��15%, SiO2Content is 3%��6%, Al2O3Content is 3%��6%, S content > 0.5% the ratio of v-ti magnetite concentrate 1:0.1��0.2 by weight add CaO, at the temperature of 800 DEG C��1400 DEG C, carry out calcining 20��60 minutes, form calcination product A;
2) alkali leaching
By step 1) in calcination product A be placed in the alkaline solution that mass concentration is 5%��52%, alkali leaching reaction 0.5��5 hour at the temperature of 300 DEG C��370 DEG C, being filtered by reactant, obtain filtrate and alkali leaching cake B, described filtrate feeds recovery and processing system;
3) desliming
By step 2) in alkali leaching cake B add water be mixed with mass concentration be 21%��25% ore pulp carry out desliming operation, obtain heavy sand C and overflow D;
4) heavily select
By step 3) in the heavy sand C ore pulp making mass concentration 35%��40% that adds water heavily select, obtain heavy concentrate selection E respectively, heavily select mine tailing F and heavily choose ore deposit G, described heavy concentrate selection E to be TFe content range be 63%��68% final iron ore concentrate, the described mine tailing F that heavily selects is SiO2Content range is the true tailings of 56%��60%, heavily chooses ore deposit G and overflow D to merge into TiO2Content range is the final ilmenite concentrate of 50%��75%.
Described alkaline solution is any one in NaOH or the KOH aqueous solution, NaOH and KOH mixed aqueous solution.
Described desliming operation adopts the desliming bucket of �� 3��5 meters to carry out desliming operation.
Described heavily choosing adopts the spiral chute of �� 0.6���� 1.2 meters heavily to select.
It is an advantage of the invention that:
The method integrated use calcining of the present invention, alkali leaching, desliming and heavily select the method selecting v-ti magnetite concentrate again, it is achieved that titanium, iron high efficiency separation in v-ti magnetite concentrate; S content much slower in the iron ore concentrate simultaneously isolated, is down to by more than 0.50% and is less than 0.10%, SiO2Content is down to less than 3%, Al by 3%��6%2O3Content is down to less than 3% by 3%��6%, for subsequent smelting creates better condition.
Calcination process utilizes CaO part to replace alkali lye consumption in the dipped journey of alkali, decreases the consumption 20%��30% of NaOH or KOH in subsequent alkaline leaching operation; Owing to CaO price is NaOH price 1/5��1/6, it is the 1/20 of KOH price, therefore can greatly reduce production cost.
The elements such as Ti, S, Si, Al in v-ti magnetite concentrate have been carried out chemical reaction by the process of alkali leaching, define corresponding salt. With v-ti magnetite concentrate the difference is that, SiO in ilmenite raw ore2Content (> 20%) and Al2O3Content (> 7%) far away higher than SiO in v-ti magnetite concentrate2Content (< 6%) and Al2O3Content (< 6%), soak in ilmenite raw ore process at alkali, owing to the process of alkali leaching will preferentially occur in SiO2��Al2O3Deng on mineral so that it is less that alkali leaching v-ti magnetite concentrate soaks ferrotianium raw ore alkali consumption than alkali, better effects if. Such as, after calcining, when soaking with NaOH alkali, the alkali amount that the present invention consumes is less than 60kg/t concentrate, and the alkali amount 469kg/t raw ore soaking raw ore consumption than alkali reduces more than 7 times.
Desliming process presses granularity and the gravity grading of mineral, and the titanium compound that alkali generates after soaking is than the fine size of magnet mineral, and proportion is little, and the difference of specific gravity of ferrotianium is bigger, it is achieved that effective separation of ferrotianium.
Add and heavily select, make iron concentrate grade bring up to 63%��68% by 50%��55%, iron ore concentrate is less than 0.1%, SiO containing S amount simultaneously2And Al2O3Content is all less than 3%, TiO2Content is down to less than 6% by 12.91%. Simultaneously, it is also possible to obtain TiO2Content is the ilmenite concentrate of 50%��75%. Employing the method achieves and titanium, iron is effectively separated, and reduces and enters blast furnace TiO2, the impurity such as S, Si, Al content, it is to increase the capacity factor of a blast furnace, reduce the quantity discharged of blast furnace slag, reduce ironmaking cost, improve titanium resource comprehensive utilization ratio simultaneously.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
As shown in Figure 1.
Embodiment 1:
1) calcine
It is 51.1%, TiO by TFe content2Content is 13.6%, SiO2Content is 3.59%, Al2O3Content is 4.05%, the v-ti magnetite concentrate of S content 0.62%, and the ratio of 1:0.2 adds CaO by weight, carries out calcining 55 minutes at the temperature of 850 DEG C, forms calcination product A, and its chemical equation is:
2) alkali leaching
By step 1) in calcination product A be placed in the NaOH alkaline solution that mass concentration is 35%, alkali leaching reaction 3.5 hours at the temperature of 360 DEG C, reactant is filtered, obtain filtrate and alkali leaching cake B, NaOH consumption 57.3kg/t is to ore deposit, described filtrate feeds recovery and processing system, and its chemical equation is:
3) desliming
By step 2) in alkali leaching cake B add water be mixed with mass concentration be 21% the ore pulp desliming bucket that feeds �� 3.0 meters carry out desliming operation, obtain heavy sand C and overflow D.
4) heavily select
By step 3) in the heavy sand C spiral chute that the ore pulp making mass concentration 38% feeds �� 1.2 meters that adds water heavily select, concentrate selection E must be weighed respectively, heavily select mine tailing F and heavily choose ore deposit G, heavy concentrate selection E to be TFe content be 67.3% final iron ore concentrate (SiO2Content is 0.29%, Al2O3Content is 1.48%, S content be 0.01%), the described mine tailing F that heavily selects is SiO2Content is the true tailings of 57.2%, and the described ore deposit G and overflow D that heavily chooses merges into TiO2Content is the final ilmenite concentrate of 73.9%.
Embodiment 2:
1) calcine
It is 51.9%, TiO by TFe content2Content is 13.8%, SiO2Content is 3.72%, Al2O3Content is 5.78%, the v-ti magnetite concentrate of S content 0.72%, and the ratio of 1:0.18 adds CaO by weight, carries out calcining 50 minutes at the temperature of 950 DEG C, forms calcination product A, and its chemical equation is with embodiment 1.
2) alkali leaching
By step 1) in calcination product A be placed in the NaOH alkaline solution that mass concentration is 32%, alkali leaching reaction 2.0 hours at the temperature of 300 DEG C, reactant is filtered, obtain filtrate and alkali leaching cake B, NaOH consumption 45.2kg/t is to ore deposit, described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1.
3) desliming
By step 2) in alkali leaching cake B add water be mixed with mass concentration be 21% the ore pulp desliming bucket that feeds �� 5.0 meters carry out desliming operation, obtain heavy sand C and overflow D.
4) heavily select
By step 3) in the heavy sand C spiral chute that the ore pulp making mass concentration 36% feeds �� 0.9 meter that adds water heavily select, concentrate selection E must be weighed respectively, heavily select mine tailing F and heavily choose ore deposit G, heavy concentrate selection E to be TFe content be 63.9% final iron ore concentrate (SiO2Content is 0.33%, Al2O3Content is 1.29%, S content be 0.01%), the described mine tailing F that heavily selects is SiO2Content is the true tailings of 57.0%, and the described ore deposit G and overflow D that heavily chooses merges into TiO2Content is the final ilmenite concentrate of 53.1%.
Embodiment 3:
1) calcine
It is 54.0%, TiO by TFe content2Content is 12.9%, SiO2Content is 4.03%, Al2O3Content is 5.22%, the v-ti magnetite concentrate of S content 0.94%, and the ratio of 1:0.16 adds CaO by weight, carries out calcining 40 minutes at the temperature of 1100 DEG C, forms calcination product A, and its chemical equation is with embodiment 1.
2) alkali leaching
By step 1) in calcination product A be placed in the NaOH alkaline solution that mass concentration is 22%, alkali leaching reaction 4.5 hours at the temperature of 350 DEG C, reactant is filtered, obtain filtrate and alkali leaching cake B, NaOH consumption 49.7kg/t is to ore deposit, described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1.
3) desliming
By step 2) in alkali leaching cake B add water be mixed with mass concentration be 22% the ore pulp desliming bucket that feeds �� 5.0 meters carry out desliming operation, obtain heavy sand C and overflow D.
4) heavily select
By step 3) in the heavy sand C spiral chute that the ore pulp making mass concentration 39% feeds �� 0.6 meter that adds water heavily select, concentrate selection E must be weighed respectively, heavily select mine tailing F and heavily choose ore deposit G, heavy concentrate selection E to be TFe content be 67.6% final iron ore concentrate (SiO2Content is 0.40%, Al2O3Content is 1.23%, S content be 0.01%), the described mine tailing F that heavily selects is SiO2Content is the true tailings of 58.8%, and the described ore deposit G and overflow D that heavily chooses merges into TiO2Content is the final ilmenite concentrate of 71.0%.
Embodiment 4:
1) calcine
It is 52.1%, TiO by TFe content2Content is 13.0%, SiO2Content is 3.44%, Al2O3Content is 4.38%, the v-ti magnetite concentrate of S content 0.63%, and the ratio of 1:0.15 adds CaO by weight, carries out calcining 35 minutes at the temperature of 1200 DEG C, forms calcination product A, and its chemical equation is with embodiment 1.
2) alkali leaching
By step 1) in calcination product A be placed in the NaOH alkaline solution that mass concentration is 45%, alkali leaching reaction 2.0 hours at the temperature of 310 DEG C, reactant is filtered, obtain filtrate and alkali leaching cake B, NaOH consumption 46.0kg/t is to ore deposit, described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1.
3) desliming
By step 2) in alkali leaching cake B add water be mixed with mass concentration be 23% the ore pulp desliming bucket that feeds �� 5.0 meters carry out desliming operation, obtain heavy sand C and overflow D.
4) heavily select
By step 3) in the heavy sand C spiral chute that the ore pulp making mass concentration 40% feeds �� 0.9 meter that adds water heavily select, concentrate selection E must be weighed respectively, heavily select mine tailing F and heavily choose ore deposit G, heavy concentrate selection E to be TFe content be 66.0% final iron ore concentrate (SiO2Content is 0.44%, Al2O3Content is 1.53%, S content be 0.02%), the described mine tailing F that heavily selects is SiO2Content is the true tailings of 59.2%, and the described ore deposit G and overflow D that heavily chooses merges into TiO2Content is the final ilmenite concentrate of 61.2%.
Embodiment 5:
1) calcine
It is 54.8%, TiO by TFe content2Content is 11.2%, SiO2Content is 3.99%, Al2O3Content is 4.58%, the v-ti magnetite concentrate of S content 0.99%, and the ratio of 1:0.13 adds CaO by weight, carries out calcining 30 minutes at the temperature of 1300 DEG C, forms calcination product A, and its chemical equation is with embodiment 1.
2) alkali leaching
By step 1) in calcination product A be placed in the KOH alkaline solution that mass concentration is 18%, alkali leaching reaction 3.0 hours at the temperature of 320 DEG C, reactant is filtered, obtain filtrate and alkali leaching cake B, KOH consumption 48.0kg/t is to ore deposit, described filtrate feeds recovery and processing system, and its chemical equation is:
3) desliming
By step 2) in alkali leaching cake B add water be mixed with mass concentration be 24% the ore pulp desliming bucket that feeds �� 3.0 meters carry out desliming operation, obtain heavy sand C and overflow D.
4) heavily select
By step 3) in the heavy sand C spiral chute that the ore pulp making mass concentration 37% feeds �� 0.9 meter that adds water heavily select, concentrate selection E must be weighed respectively, heavily select mine tailing F and heavily choose ore deposit G, heavy concentrate selection E to be TFe content be 66.4% final iron ore concentrate (SiO2Content is 0.40%, Al2O3Content is 1.49%, S content be 0.01%), the described mine tailing F that heavily selects is SiO2Content is the true tailings of 59.0%, and the described ore deposit G and overflow D that heavily chooses merges into TiO2Content is the final ilmenite concentrate of 55.9%.
Embodiment 6:
1) calcine
It is 52.6%, TiO by TFe content2Content is 12.9%, SiO2Content is 3.58%, Al2O3Content is 4.60%, the v-ti magnetite concentrate of S content 0.66%, and the ratio of 1:0.11 adds CaO by weight, carries out calcining 20 minutes at the temperature of 1400 DEG C, forms calcination product A, and its chemical equation is with embodiment 1.
2) alkali leaching
By step 1) in calcination product A be placed in the KOH alkaline solution that mass concentration is 10%, alkali leaching reaction 2.5 hours at the temperature of 370 DEG C, reactant is filtered, obtain filtrate and alkali leaching cake B, KOH consumption 44.0kg/t is to ore deposit, described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 5.
3) desliming
By step 2) in alkali leaching cake B add water be mixed with mass concentration be 25% the ore pulp desliming bucket that feeds �� 5.0 meters carry out desliming operation, obtain heavy sand C and overflow D.
4) heavily select
By step 3) in the heavy sand C spiral chute that the ore pulp making mass concentration 38% feeds �� 0.6 meter that adds water heavily select, concentrate selection E must be weighed respectively, heavily select mine tailing F and heavily choose ore deposit G, heavy concentrate selection E to be TFe content be 66.9% final iron ore concentrate (SiO2Content is 0.42%, Al2O3Content is 1.33%, S content be 0.01%), the described mine tailing F that heavily selects is SiO2Content is the true tailings of 58.4%, and the described ore deposit G and overflow D that heavily chooses merges into TiO2Content is the final ilmenite concentrate of 66.1%.
Embodiment 7:
1) calcine
It is 52.6%, TiO by TFe content2Content is 12.5%, SiO2Content is 3.82%, Al2O3Content is 4.71%, the v-ti magnetite concentrate of S content 0.60%, and the ratio of 1:0.1 adds CaO by weight, carries out calcining 20 minutes at the temperature of 1350 DEG C, forms calcination product A, and its chemical equation is with embodiment 1.
2) alkali leaching
By step 1) in calcination product A be placed in that NaOH mass concentration is 22%, KOH mass concentration is the alkaline solution of 6%, alkali leaching reaction 2.0 hours at the temperature of 330 DEG C, reactant is filtered, obtain filtrate and alkali leaching cake B, NaOH consumption 25.2kg/t is to ore deposit, KOH consumption 45.6kg/t is to ore deposit, and described filtrate feeds recovery and processing system, and its chemical equation is with embodiment 1 and embodiment 5.
3) desliming
By step 2) in alkali leaching cake B add water be mixed with mass concentration be 24% the ore pulp desliming bucket that feeds �� 3.0 meters carry out desliming operation, obtain heavy sand C and overflow D.
4) heavily select
By step 3) in the heavy sand C spiral chute that the ore pulp making mass concentration 40% feeds �� 0.9 meter that adds water heavily select, concentrate selection E must be weighed respectively, heavily select mine tailing F and heavily choose ore deposit G, heavy concentrate selection E to be TFe content be 67.3% final iron ore concentrate (SiO2Content is 0.28%, Al2O3Content is 1.02%, S content be 0.01%), the described mine tailing F that heavily selects is SiO2Content is the true tailings of 56.1%, and the described ore deposit G and overflow D that heavily chooses merges into TiO2Content is the final ilmenite concentrate of 68.2%.

Claims (3)

1. one kind utilizes calcining, alkali leaching, desliming and heavily selects the method selecting v-ti magnetite concentrate again, it is characterised in that comprise the steps:
1) calcine
It is 50%��55%, TiO by TFe content range2Content range is 10%��15%, SiO2Content is 3%��6%, Al2O3Content is 3%��6%, S content > 0.5% the ratio of v-ti magnetite concentrate 1:0.1��0.2 by weight add CaO, at the temperature of 800 DEG C��1400 DEG C, carry out calcining 20��60 minutes, form calcination product A;
2) alkali leaching
Calcination product A in step 1) is placed in the alkaline solution that mass concentration is 5%��52%, and at the temperature of 300 DEG C��370 DEG C, alkali leaching reaction 0.5��5 hour, filters reactant, obtains filtrate and alkali leaching cake B, and described filtrate feeds recovery and processing system; Described alkaline solution is any one in NaOH or the KOH aqueous solution, NaOH and KOH mixed aqueous solution;
3) desliming
By step 2) in alkali leaching cake B add water be mixed with mass concentration be 21%��25% ore pulp carry out desliming operation, obtain heavy sand C and overflow D;
4) heavily select
The ore pulp making mass concentration 35%��40% that added water by heavy sand C in step 3) heavily selects, obtain heavy concentrate selection E respectively, heavily select mine tailing F and heavily choose ore deposit G, described heavy concentrate selection E to be TFe content be 63%��68% final iron ore concentrate, the described mine tailing F that heavily selects is SiO2Content range is the true tailings of 56% ~ 60%, heavily chooses ore deposit G and overflow D to merge into TiO2Content range is the final ilmenite concentrate of 50%��75%.
2. utilization according to claim 1 calcining, alkali leaching, desliming and heavily select the method selecting v-ti magnetite concentrate again, it is characterised in that described desliming operation adopts the desliming bucket of �� 3��5 meters to carry out desliming operation.
3. utilization according to claim 1 calcining, alkali leaching, desliming and heavily select the method selecting v-ti magnetite concentrate again, it is characterised in that described heavily choosing adopts the spiral chute of �� 0.6���� 1.2 meters heavily to select.
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