CN107335535A - A kind of low-grade difficulty selects the Efficient beneficiation method of smelting titanomagnetite - Google Patents

A kind of low-grade difficulty selects the Efficient beneficiation method of smelting titanomagnetite Download PDF

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CN107335535A
CN107335535A CN201710765769.6A CN201710765769A CN107335535A CN 107335535 A CN107335535 A CN 107335535A CN 201710765769 A CN201710765769 A CN 201710765769A CN 107335535 A CN107335535 A CN 107335535A
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ore
magnetic
low
slurry
iron
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CN107335535B (en
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邓琴
刑志华
蔺朝晖
宋钊刚
朱冰龙
蔡正鹏
孙贵爱
沙斌
温合平
温海滨
董慧琳
饶荣军
焦栋
詹忠杰
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Yuxi Dahongshan Mining Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00General arrangement of separating plant, e.g. flow sheets

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Abstract

The present invention discloses the Efficient beneficiation method that a kind of low-grade difficulty selects smelting titanomagnetite, including low-grade difficulty is selected into the broken destruction step of smelting titanomagnetite;Simultaneously cyclone classification I obtains fine grained overflow I and coarse grain ore pulp I to titanomagnetite ore grinding after crushing, and coarse grain ore pulp I regrinds the primary grinding classification step of I return;Fine grained overflow I is obtained to one section of low intensity magnetic separation step of iron ore concentrate slurry I and Tailings Slurry I through low intensity magnetic separation I;Iron ore concentrate slurry I, which is sieved, must sieve the sieve classification step of thin ore pulp under upper rough and sieve;Iron ore concentrate slurry I is obtained into fine grained overflow II and coarse grain ore pulp II with sieving the upper rough cyclone classification II that merges, coarse grain ore pulp II regrinds the secondary grinding classification step of II return cyclone classification II;Fine grained overflow II is obtained to two sections of low intensity magnetic separation steps of iron ore concentrate slurry II and Tailings Slurry II through low intensity magnetic separation II.The present invention selects smelting titanomagnetite for low-grade difficulty, with reference to cyclone classification and low intensity magnetic separation to improve the ferrotitanium rate of recovery, has the characteristics of technique is simple, easy to operate, beneficiating efficiency is high.

Description

A kind of low-grade difficulty selects the Efficient beneficiation method of smelting titanomagnetite
Technical field
The invention belongs to ferrous metal technical field of beneficiation, and in particular to a kind of technique is simple, easy to operate, cost is low, choosing Ore deposit efficiency and the high low-grade difficulty of the ferrotitanium rate of recovery select the Efficient beneficiation method of smelting titanomagnetite.
Background technology
The iron ore reserves in China more than 95% are lean ore, average grade only 32.00% or so.Due to by technical merit and The restriction of economic benefit, a large amount of ultra-poor unbalanced-ores that on the one hand most of existing iron ore mines separate in recovery process and poor miscellaneous Ore deposit ore is banked up and not utilized, on the other hand also has a large amount of ultra-poor iron ores not yet to develop so far.With steel industry Fast development, the iron ore deposit that geological conditions is good, resource grade is high, sorting is good is just close to exhaustion, therefore low-grade iron ore Recycling is extremely urgent, this potentiality for excavating iron ore deposit, improves domestic iron ore deposit and ensures safety degree etc. It is respectively provided with significance.
But there is following several respects technical barrier in the utilization of iron ore of low ore grade.
(1) poor value Iron grade is extremely low, and surrounding rock and ore are in gradual change relation, and ore and country rock boundary line are unclear, Tail is thrown using current ripe bulk dry type magnetic separation or bulk jigging technology, milling ore grade only improve 2 percentage points, Simultaneously throw tail amount seldom, ferrous metal loss it is very big.
(2) in mining process, ore loss ratio and barren rock incorporation rate are difficult to control, and cause the grade of milling ore to be difficult to control System.
(3) because the Iron grade of ore is low, the choosing of relatively difficult tribulation, ratio of concentration are big, handled according to the technique of preparing of routine, High Concentrate cost, mine economic profit difference or loss will be caused.
(4) due to being limited by dry-type magnetic selection apparatus grading principle, ore throws tail under thinner granularity using dry type magnetic separation Effect is poor, and there has been no the high-efficient wet-type magnetic plant of the suitable product throwing tail in small, broken bits of maturation at present.
For the chromium depleted zone relatively low to grade, domestic and international most of magnetite separation factory is thrown using coarse grain dry type magnetic separation The method of tail, a large amount of mine tailings are abandoned reaching raising treating capacity, improving Beneficiation Feed Grade and reducing production cost before raw ore enters mill Purpose.But for grade 20% or so and following Ultra-low-grade magnetite ore, because grade is extremely low and the embedding cloth of iron mineral Granularity is very thin, and during grade difference very little between ore and country rock, the separating effect of dry-type magnetic extractor is undesirable.
Prior art thought for magnetic iron ore, high magnetic pre-selection technique for it is energy-saving, effectively utilize Extremely lean iron ore There is especially important meaning with final Iron Concentrate Quality is improved.But because high magnetic pre-selection equipment is because of magnetic field intensity higher magnetic field power It is larger, the powerful magnetic coagulation that sorts of magnetic iron ore is acted on, therefore " magnetic is mingled with " and " non magnetic to be mingled with " be present, and make essence Contain more gangue in ore deposit, have a strong impact on concentrate grade.In order to magnetic caused by solving high intensity magnetic separation equipment and it is non magnetic be mingled with, Taking such as increases the number of poles of drum magnetic separator, the appropriate magnetic field intensity for reducing concentrate end, in the casing of concentrate end plus rinses Water;Develop vibration magnetic separator, pulsating field and Rotating field magnetic separator etc..But above-mentioned a variety of methods, improve magnetic field concentrate iron product The amplitude of position is not high, and generally only 0.5 ~ 1.5%, also result in that technological process is long and complex, and middling cycle amount is excessive, consumption is high, Beneficiation cost remains high.
At present, the ore dressing for titanomagnetite and vanadium titano-magnetite generally using " first select iron, then select titanium " principle or " iron, titanium grind sorting altogether " principle.The principle of " first select iron, then select titanium " includes iron ore production line more independent each other and titanium ore life Producing line, the mineral of low iron content after mineral are disposed by iron ore production line are continued with into titanium ore production line, existed The problems such as beneficiation flowsheet is long, device configuration is more, construction investment and management operating cost are high;Iron in " iron, titanium grind sorting altogether " principle Ore deposit and titanium ore are carried out with sorting basic synchronization, and in ore grinding step, the granularity control of mineral has problem, causes ilmenite Overground argillization phenomenon is serious, and the mineral in mineral grain can not be reclaimed well, and titanium resource utilization rate is low.
In low-grade titanomagnetite, such as elder brother's diamond spar river stockaded village iron ore raw ore iron content 20% or so, belong to low-grade ore, ore In harmful element be P, content of titanium dioxide 5% or so.Raw ore major metal mineral have magnetic iron ore, titanomagnetite, gangue mineral With hornblend, anorthoclase, chlorite etc..Through Microscopic observation, Within Monominerals chemical analysis, artificial panning and X- diffraction analysis, Iron in ore has two kinds of occurrence status:A kind of preservation in the form of Independent Mineral is in magnetic iron ore, ilmenite and a small amount of brown(It is red) Iron ore;A kind of preservation in the form of isomorphous is in pyroxene, hornblend and a small amount of biotite, chlorite.Raw ore mineral composition Through Microscopic observation, artificial panning and X- diffraction analysis, there are oxide, silicate, sulfide, the class 17 of phosphate four in ore Kind mineral are present.Silicate is main, account for ore 76% ±;Oxide is secondary, account for ore 17.2% ±;Phosphate accounts for ore 6.7%;Sulfide is a small amount of.The ore mineral of wherein iron and titanium accounts for the 16.2% of ore.Elder brother's diamond spar river stockaded village iron ore belongs to typical low Grade, the difficult titanomagnetite for selecting smelting.Therefore it provides a kind of technique is simple and economy, beneficiating efficiency and high low of the ferrotitanium rate of recovery Grade difficulty selects smelting titanomagnetite ore dressing method, the utilization rate and the economic benefit of enterprise that will can improve iron ore deposit.
The content of the invention
It is an object of the invention to provide a kind of technique is simple, easy to operate, cost is low, beneficiating efficiency and the ferrotitanium rate of recovery are high Low-grade difficulty select the Efficient beneficiation method of smelting titanomagnetite.
The object of the present invention is achieved like this:Including broken, primary grinding classification, one section of low intensity magnetic separation, sieve classification, two Section grind grading, two sections of low intensity magnetic separation steps, are specifically included:
A, crush:Low-grade difficulty is selected into smelting titanomagnetite crushing raw ore to granularity -10mm;
B, primary grinding is classified:Will it is broken after titanomagnetite ore grinding I to the mesh of fineness -200 account for more than 70% and concentration be 25~ 35% ore pulp and through cyclone classification I, obtains fine grained overflow I and coarse grain ore pulp I, coarse grain ore pulp I returns after ore grinding II is regrinded Cyclone classification I;
C, one section of low intensity magnetic separation:Low intensity magnetic separation I by the fine grained overflow I after cyclone classification I through magnetic induction intensity for 150~220mT Obtain iron ore concentrate slurry I and Tailings Slurry I;
D, sieve classification:The screening for the via hole diameter 2mm of Tailings Slurry I that step C obtains is obtained to sieve the lower Tailings Slurry of upper rough and sieve, by The lower Tailings Slurry of sieve throws tail;
E, secondary grinding is classified:On the sieve that the iron ore concentrate slurry I that step C obtains is obtained with D steps it is rough merge after carry out eddy flow Classification II, obtains fine grained overflow II and coarse grain ore pulp II that the mesh of fineness -200 accounts for more than 95%, coarse grain ore pulp II through ore grinding III again Cyclone classification II is returned after mill;
F, two sections of low intensity magnetic separations:The fine grained overflow II that E steps obtain is obtained through the low intensity magnetic separation II that magnetic induction intensity is 80~150mT To iron ore concentrate slurry II and Tailings Slurry II, Tailings Slurry II is thrown into tail.
The present invention selects that smelting magnetic iron ore iron mineral disseminated grain size is thinner, and the grade between ore and country rock is poor for low-grade difficulty Not less feature, throw tail for the dry type magnetic separation that generally uses in the prior art and bulk jigging throw tail amount seldom, ferrous metal Loss, and there has been no the high-efficient wet-type magnetic plant that the suitable product in small, broken bits of maturation throws tail;And high magnetic pre-selection throws tail effect Well but because magnetic field intensity higher magnetic field power is larger, the powerful magnetic coagulation that sorts of magnetic iron ore is acted on, therefore " magnetic holder is present It is miscellaneous " and " non magnetic to be mingled with ", and make to contain more gangue in concentrate, have a strong impact on the problems such as concentrate grade.The present invention Using multistage stage grinding cyclone classification, the other combined crosswise technical scheme of multistage low intensity magnetic separation, and optimum organization each stage Technical parameter, the magnetic coagulation effect in sight weakened when magnetic plant sorts, reduces " magnetic is mingled with " and " non magnetic to be mingled with " influence, While so as to effectively reduce the gangue in iron ore concentrate, the rate of recovery of ferro element and concentrate are improved also by multistage low intensity magnetic separation Grade.The present invention relatively conventional " iron, titanium grind sorting altogether " is difficult to control in the granularity of ore grinding step Minerals, causes titanium The overground argillization phenomenon of iron ore is serious, the problem that the mineral in mineral grain can not be reclaimed well, employs multistage ore grinding Progressively to refine mineral, coordinate the multistage weak magnetic separation process of intersection, section low intensity magnetic separation is unified by primary grinding grade separation, can incite somebody to action Weak magnetic, a small amount of ilmenite of high rigidity and ferromagnetism, the magnetic iron ore of soft, titanomagnetite separate each other, avoid hardness phase The larger mineral of difference produce meticulous mineral grain in the ore grinding processing in later stage and overground argillization phenomena impair recovery occur, together When also reach a large amount for the treatment of capacity purposes thrown tails, reduce later stage ore grinding and low intensity magnetic separation, effectively reduce production cost and improve ore dressing Efficiency.Two sections of low intensity magnetic separations are closed by the mill distribution of two sections of later stage again, further refine mineral to dissociate gangue, so as to by relatively high magnetism Magnetic iron ore, titanium magnet grains from the iron ore concentrate slurry I of one end low intensity magnetic separation magneticly elect come, reached with effectively improving the Iron grade of iron ore concentrate More than 50%.Therefore, the present invention has the characteristics of technique is simple, easy to operate, cost is low, beneficiating efficiency and the ferrotitanium rate of recovery are high.
Brief description of the drawings
Fig. 1 is one of process flow diagram of the present invention;
Fig. 2 is the two of the process flow diagram of the present invention;
In figure:1- ore grindings I, 2- ore grindings II, 3- ore grindings III.
Embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples, but the present invention is not subject in any way Limitation, based on present invention teach that any changes and modifications made, belong to protection scope of the present invention.
As illustrated in fig. 1 and 2, the present invention includes broken, primary grinding classification, one section of low intensity magnetic separation, sieve classification, secondary grinding Classification, two sections of low intensity magnetic separation steps, are specifically included:
A, crush:Low-grade difficulty is selected into smelting titanomagnetite crushing raw ore to granularity -10mm;
B, primary grinding is classified:Will it is broken after titanomagnetite ore grinding I to the mesh of fineness -200 account for more than 70% and concentration be 25~ 35% ore pulp and through cyclone classification I, obtains fine grained overflow I and coarse grain ore pulp I, coarse grain ore pulp I returns after ore grinding II is regrinded Cyclone classification I;
C, one section of low intensity magnetic separation:Low intensity magnetic separation I by the fine grained overflow I after cyclone classification I through magnetic induction intensity for 150~220mT Obtain iron ore concentrate slurry I and Tailings Slurry I;
D, sieve classification:The screening for the via hole diameter 2mm of Tailings Slurry I that step C obtains is obtained to sieve the lower Tailings Slurry of upper rough and sieve, by The lower Tailings Slurry of sieve throws tail;
E, secondary grinding is classified:On the sieve that the iron ore concentrate slurry I that step C obtains is obtained with D steps it is rough merge after carry out eddy flow Classification II, obtains fine grained overflow II and coarse grain ore pulp II that the mesh of fineness -200 accounts for more than 95%, coarse grain ore pulp II through ore grinding III again Cyclone classification II is returned after mill;
F, two sections of low intensity magnetic separations:The fine grained overflow II that E steps obtain is obtained through the low intensity magnetic separation II that magnetic induction intensity is 80~150mT To iron ore concentrate slurry II and Tailings Slurry II, Tailings Slurry II is thrown into tail.
Titanomagnetite is milled to the ore pulp that the mesh of fineness -200 accounts for more than 50% in the step B, then it is screened obtain fineness - It is upper rough that 200 mesh account for ore pulp and sieve under more than 70% sieve, and ore pulp is rough on the sieve to return to warp through cyclone classification I under the sieve Ore grinding I is regrinded.
Tailings Slurry obtains high intensity magnetic mineral I through the high intensity magnetic separation I that magnetic induction intensity is 1~1.2T under the sieve that the D steps obtain With strong magnetic tail ore deposit I, the high intensity magnetic mineral I is merged into iron ore concentrate slurry I, and the strong magnetic tail ore deposit I throws tail.
The Tailings Slurry II that the F-step obtains feeds concentrator and is concentrated to give the concentration Tailings Slurry that concentration is not more than 5%, The concentration Tailings Slurry obtains high intensity magnetic mineral and strong magnetic tail ore deposit through 1~2 grade of high intensity magnetic separation, and the high intensity magnetic mineral is merged into iron ore concentrate slurry II, the strong magnetic tail ore deposit throws tail.
The concentration Tailings Slurry obtains high intensity magnetic mineral II and strong magnetic tail ore deposit through the high intensity magnetic separation II that magnetic induction intensity is 1~1.2T II, the high intensity magnetic mineral II is merged into iron ore concentrate slurry II.
The high intensity magnetic mineral II obtains high intensity magnetic mineral III and strong magnetic tail through the high intensity magnetic separation III that magnetic induction intensity is 1.2~1.5T Ore deposit III, the high intensity magnetic mineral III are merged into iron ore concentrate slurry II, and the strong magnetic tail ore deposit III is merged into strong magnetic tail ore deposit II and throws tail.
The mesh of I fineness of fine grained overflow -200 that the step B obtains account for more than 75% and concentration be 15~20%.
It is 17~23% that the low-grade difficulty, which selects the Fe grades of smelting titanomagnetite raw ore, TiO2Grade is 4.5~6%, P grades It is not less than 50% in total iron distributive law not less than 1%, magnetic iron ore.
The concentration of iron ore concentrate slurry II is not less than 50% not less than 40% and Fe grades.
The iron ore concentrate slurry II feeds elutriation magnetic separator and obtains elutriation concentrate of the concentration not less than 60% and eluriate mine tailing.
The water supply pressure of the elutriation magnetic separator is not less than 0.25MPa, operating voltage 380v, 0~300Gs of magnetic field intensity can Regulation.
Embodiment 1
As shown in figure 1, Yu He stockaded villages iron ore raw ore Iron grade 19.29%, TiO2Grade 5.03%, raw ore moisture content 3.3%.Above-mentioned original Ore deposit is selected in the steps below:
S100:Above-mentioned raw ore is crushed to granularity -10mm by the jaw crusher of PE900 × 1200;
S200:Will it is broken after raw ore through the closed circuit wet grindings of semi-automatic mill of φ 5.5 × 1.8, obtain the mesh of fineness -200 account for 70% with Upper and concentration is 30.5% ore pulp, and ore pulp is classified through the hydrocyclones I of φ 350, obtains the fine grained overflow I that concentration is 17.4% With coarse grain ore pulp I, coarse grain ore pulp I is returned into the hydrocyclones I of φ 350 after the ball milling wet types of φ 3.2 × 5.4 are regrinded and divided again Level;
S300:The low intensity magnetic separation I that fine grained overflow I is 200mT through magnetic induction intensity is obtained into the iron ore concentrate slurry I that concentration is 35.2% With Tailings Slurry I;
S400:It is 14.64% that the drum sieve for the via hole diameter 2mm of Tailings Slurry I that upper step obtains, which is sieved to obtain the upper rough and concentration of sieve, The lower Tailings Slurry of sieve, the lower Tailings Slurry of sieve is thrown into tail;
S500:Above-mentioned iron ore concentrate slurry I is merged with rough on sieve, is classified through the hydrocyclones II of φ 350, obtaining concentration is 9.76%th, the mesh of fineness -200 accounts for more than 95% fine grained overflow II and coarse grain ore pulp II, and coarse grain ore pulp II is through the balls of φ 2.7 × 3.6 Mill wet type returns to the hydrocyclones II of φ 350 after regrinding and is classified again;
S600:Above-mentioned fine grained overflow II is obtained into iron ore concentrate slurry II and mine tailing through the low intensity magnetic separation II that magnetic induction intensity is 100mT Slurry II, Tailings Slurry II is fed into φ 24m concentration basins and is concentrated to give the concentration Tailings Slurry of concentration 2.68% and throws tail.
By the ferromagnetic iron ore raw ore in above-mentioned steps commerical test Yu He stockaded villages, the concentration of iron ore concentrate slurry II finally given is 41.32%th, Iron grade 51.97%, TiO2Grade 14.76%, yield 18.22%, iron yield 49.09%, titanium yield 53.46%, select ratio For 5.5;The sieve lower tail pulp density that S600 concentration Tailings Slurry merges S400 is 6.9%, Iron grade 12.01%, TiO2Grade 2.86%th, yield 81.78%.
Embodiment 2
As shown in Fig. 2 Yu He stockaded villages iron ore raw ore Iron grade 21.37%, TiO2Grade 4.95%, raw ore moisture content 3.5%.Above-mentioned original Ore deposit is selected in the steps below:
S100:Above-mentioned raw ore is crushed to granularity -10mm by the jaw crusher of PE900 × 1200;
S200:Will it is broken after raw ore through the closed circuit wet grindings of semi-automatic mill of φ 5.5 × 1.8, obtain the mesh of fineness -200 account for 70% with Upper and concentration is 32.8% ore pulp, and ore pulp is classified through the hydrocyclones I of φ 350, obtains the fine grained overflow I that concentration is 18.3% With coarse grain ore pulp I, coarse grain ore pulp I is returned into the hydrocyclones I of φ 350 after the ball milling wet types of φ 3.2 × 5.4 are regrinded and divided again Level;
S300:The low intensity magnetic separation I that fine grained overflow I is 150mT through magnetic induction intensity is obtained into the iron ore concentrate slurry I that concentration is 35.9% With Tailings Slurry I;
S400:The via hole diameter 2mm of Tailings Slurry I drum sieve is sieved to obtain and sieves the lower Tailings Slurry of upper rough and sieve, lower Tailings Slurry will be sieved High intensity magnetic mineral I and strong magnetic tail ore deposit I are obtained through the high intensity magnetic separation I that magnetic induction intensity is 1T, the upper rough, high intensity magnetic mineral I of sieve is merged into Iron ore concentrate slurry I, strong magnetic tail ore deposit I throw tail;
S500:Above-mentioned iron ore concentrate slurry I, high intensity magnetic mineral I are merged with rough on sieve, is classified, obtains through the hydrocyclones II of φ 350 Concentration is fine grained overflow II and the coarse grain ore pulp II that the 10.48%, mesh of fineness -200 accounts for more than 95%, and coarse grain ore pulp II is through φ 2.7 × 3.6 ball milling wet types return to the hydrocyclones II of φ 350 after regrinding and are classified again;
S610:Above-mentioned fine grained overflow II is obtained into iron ore concentrate slurry II and Tailings Slurry through the low intensity magnetic separation II that magnetic induction intensity is 80mT Ⅱ;
S620:Tailings Slurry II is fed into the concentration Tailings Slurry that φ 24m concentration basins are concentrated to give concentration 3.17%, concentration Tailings Slurry warp Magnetic induction intensity is that 1.2T high intensity magnetic separation II obtains high intensity magnetic mineral II and strong magnetic tail ore deposit II, and high intensity magnetic mineral II is merged into iron ore concentrate slurry II obtains final iron ore concentrate slurry, and strong magnetic tail ore deposit II merges strong magnetic tail ore deposit I and throws tail.
By the ferromagnetic iron ore raw ore in above-mentioned steps commerical test Yu He stockaded villages, the iron ore concentrate slurry concentration finally given be 43.51%, Iron grade 53.25%, TiO2Grade 15.04%, yield 18.54%, iron yield 51.73%, titanium yield 54.51%, choosing is than being 5.4;Close And Tailings Slurry concentration is 6.72%, Iron grade 11.66%, TiO2Grade 2.72%, yield 83.07%.
Embodiment 3
As shown in Fig. 2 Yu He stockaded villages iron ore raw ore Iron grade 18.86%, TiO2Grade 5.11%, raw ore moisture content 3.2%.Above-mentioned original Ore deposit is selected in the steps below:
S100:Above-mentioned raw ore is crushed to granularity -10mm by the jaw crusher of PE900 × 1200;
S210:Will it is broken after raw ore through the closed circuit wet grindings of semi-automatic mill of φ 5.5 × 1.8, obtain the mesh of fineness -200 account for 50% with On ore pulp;
S220:By the ore pulp that S210 ore grindings obtain through straight line shaker sieve to obtain the mesh of fineness -200 account for more than 70% and concentration be Ore pulp and sieve are upper rough under 29.34% sieve, and the upper rough return of sieve is regrinded through the closed circuit wet types of semi-automatic mill of φ 5.5 × 1.8;
S230:The lower ore pulp of sieve is classified through the hydrocyclones I of φ 350, obtains the fine grained overflow I and coarse grain that concentration is 17.06% Ore pulp I, coarse grain ore pulp I is returned into the hydrocyclones I of φ 350 after the ball milling wet types of φ 3.2 × 5.4 are regrinded and is classified again;
S300:The low intensity magnetic separation I that fine grained overflow I is 220mT through magnetic induction intensity is obtained into the iron ore concentrate slurry I that concentration is 34.83% With Tailings Slurry I;
S400:The via hole diameter 2mm of Tailings Slurry I drum sieve is sieved to obtain and sieves the lower Tailings Slurry of upper rough and sieve, lower Tailings Slurry will be sieved High intensity magnetic mineral I and strong magnetic tail ore deposit I are obtained through the high intensity magnetic separation I that magnetic induction intensity is 1.2T, the upper rough, high intensity magnetic mineral I of sieve is merged Enter iron ore concentrate slurry I, strong magnetic tail ore deposit I throws tail;
S500:Above-mentioned iron ore concentrate slurry I, high intensity magnetic mineral I are merged with rough on sieve, is classified, obtains through the hydrocyclones II of φ 350 Concentration be 9.28%, the mesh of fineness -200 account for more than 95% fine grained overflow II and coarse grain ore pulp II, coarse grain ore pulp II through φ 2.7 × 3.6 ball milling wet types return to the hydrocyclones II of φ 350 after regrinding and are classified again;
S610:Above-mentioned fine grained overflow II is obtained into iron ore concentrate slurry II and mine tailing through the low intensity magnetic separation II that magnetic induction intensity is 150mT Slurry II;
S620:Tailings Slurry II is fed into the concentration Tailings Slurry that φ 24m concentration basins are concentrated to give concentration 2.85%, concentration Tailings Slurry warp Magnetic induction intensity is that 1T high intensity magnetic separation II obtains high intensity magnetic mineral II and strong magnetic tail ore deposit II;
S630:High intensity magnetic mineral II is obtained into high intensity magnetic mineral III and strong magnetic tail ore deposit III through the high intensity magnetic separation III that magnetic induction intensity is 1.2T, High intensity magnetic mineral III is merged into iron ore concentrate slurry II and obtains final iron ore concentrate slurry, strong magnetic tail ore deposit III, strong magnetic tail ore deposit II are merged into by force Magnetic tail ore deposit I throws tail.
By the ferromagnetic iron ore raw ore in above-mentioned steps commerical test Yu He stockaded villages, the iron ore concentrate slurry concentration finally given be 42.94%, Iron grade 52.62%, TiO2Grade 14.68%, yield 18.79%, iron yield 53.32%, titanium yield 52.84%, choosing is than being 5.3;Close And Tailings Slurry concentration is 6.47%, Iron grade 10.32%, TiO2Grade 2.85%, yield 84.24%.
Embodiment 4
As shown in Fig. 2 Yu He stockaded villages iron ore raw ore Iron grade 22.67%, TiO2Grade 4.75%, raw ore moisture content 3.5%.Above-mentioned original Ore deposit is selected in the steps below:
S100:Above-mentioned raw ore is crushed to granularity -10mm by the jaw crusher of PE900 × 1200;
S210:Will it is broken after raw ore through the closed circuit wet grindings of semi-automatic mill of φ 5.5 × 1.8, obtain the mesh of fineness -200 account for 50% with On ore pulp;
S220:By the ore pulp that S210 ore grindings obtain through straight line shaker sieve to obtain the mesh of fineness -200 account for more than 70% and concentration be Ore pulp and sieve are upper rough under 34.11% sieve, and the upper rough return of sieve is regrinded through the closed circuit wet types of semi-automatic mill of φ 5.5 × 1.8;
S230:The lower ore pulp of sieve is classified through the hydrocyclones I of φ 350, obtains the fine grained overflow I and coarse grain that concentration is 19.31% Ore pulp I, coarse grain ore pulp I is returned into the hydrocyclones I of φ 350 after the ball milling wet types of φ 3.2 × 5.4 are regrinded and is classified again;
S300:The low intensity magnetic separation I that fine grained overflow I is 175mT through magnetic induction intensity is obtained into the iron ore concentrate slurry I that concentration is 37.63% With Tailings Slurry I;
S400:The via hole diameter 2mm of Tailings Slurry I drum sieve is sieved to obtain and sieves the lower Tailings Slurry of upper rough and sieve, lower Tailings Slurry will be sieved High intensity magnetic mineral I and strong magnetic tail ore deposit I are obtained through the high intensity magnetic separation I that magnetic induction intensity is 1.1T, the upper rough, high intensity magnetic mineral I of sieve is merged Enter iron ore concentrate slurry I, strong magnetic tail ore deposit I throws tail;
S500:Above-mentioned iron ore concentrate slurry I, high intensity magnetic mineral I are merged with rough on sieve, is classified, obtains through the hydrocyclones II of φ 350 Concentration is fine grained overflow II and the coarse grain ore pulp II that the 10.71%, mesh of fineness -200 accounts for more than 95%, and coarse grain ore pulp II is through φ 2.7 × 3.6 ball milling wet types return to the hydrocyclones II of φ 350 after regrinding and are classified again;
S610:Above-mentioned fine grained overflow II is obtained into iron ore concentrate slurry II and mine tailing through the low intensity magnetic separation II that magnetic induction intensity is 125mT Slurry II;
S620:Tailings Slurry II is fed into the concentration Tailings Slurry that φ 24m concentration basins are concentrated to give concentration 3.17%, concentration Tailings Slurry warp Magnetic induction intensity is that 1.1T high intensity magnetic separation II obtains high intensity magnetic mineral II and strong magnetic tail ore deposit II;
S630:High intensity magnetic mineral II is obtained into high intensity magnetic mineral III and strong magnetic tail ore deposit III through the high intensity magnetic separation III that magnetic induction intensity is 1.5T, High intensity magnetic mineral III is merged into iron ore concentrate slurry II and obtains final iron ore concentrate slurry, strong magnetic tail ore deposit III, strong magnetic tail ore deposit II are merged into by force Magnetic tail ore deposit I throws tail.
By the ferromagnetic iron ore raw ore in above-mentioned steps commerical test Yu He stockaded villages, the iron ore concentrate slurry concentration finally given be 43.64%, Iron grade 54.16%, TiO2Grade 14.95%, yield 19.68%, iron yield 55.83%, titanium yield 53.67%, choosing is than being 5.1;Close And Tailings Slurry concentration is 7.06%, Iron grade 10.18%, TiO2Grade 2.77%, yield 83.61%.

Claims (10)

1. a kind of low-grade difficulty selects the Efficient beneficiation method of smelting titanomagnetite, it is characterised in that it is characterized in that including it is broken, one Section grind grading, one section of low intensity magnetic separation, sieve classification, secondary grinding classification, two sections of low intensity magnetic separation steps, are specifically included:
A, crush:Low-grade difficulty is selected into smelting titanomagnetite crushing raw ore to granularity -10mm;
B, primary grinding is classified:Will it is broken after titanomagnetite ore grinding I to the mesh of fineness -200 account for more than 70% and concentration be 25~ 35% ore pulp and through cyclone classification I, obtains fine grained overflow I and coarse grain ore pulp I, coarse grain ore pulp I returns after ore grinding II is regrinded Cyclone classification I;
C, one section of low intensity magnetic separation:Low intensity magnetic separation I by the fine grained overflow I after cyclone classification I through magnetic induction intensity for 150~220mT Obtain iron ore concentrate slurry I and Tailings Slurry I;
D, sieve classification:The screening for the via hole diameter 2mm of Tailings Slurry I that step C obtains is obtained to sieve the lower Tailings Slurry of upper rough and sieve, by The lower Tailings Slurry of sieve throws tail;
E, secondary grinding is classified:On the sieve that the iron ore concentrate slurry I that step C obtains is obtained with D steps it is rough merge after carry out eddy flow Classification II, obtains fine grained overflow II and coarse grain ore pulp II that the mesh of fineness -200 accounts for more than 95%, coarse grain ore pulp II through ore grinding III again Cyclone classification II is returned after mill;
F, two sections of low intensity magnetic separations:The fine grained overflow II that E steps obtain is obtained through the low intensity magnetic separation II that magnetic induction intensity is 80~150mT To iron ore concentrate slurry II and Tailings Slurry II, Tailings Slurry II is thrown into tail.
2. low-grade difficulty selects the Efficient beneficiation method of smelting titanomagnetite according to claim 1, it is characterised in that the D steps Tailings Slurry obtains high intensity magnetic mineral I and strong magnetic tail ore deposit I through the high intensity magnetic separation I that magnetic induction intensity is 1~1.2T under obtained sieve, described strong Magnetic concentrate I is merged into iron ore concentrate slurry I, and the strong magnetic tail ore deposit I throws tail.
3. low-grade difficulty selects the Efficient beneficiation method of smelting titanomagnetite according to claim 1, it is characterised in that the F-step Obtained Tailings Slurry II feeds concentrator and is concentrated to give the concentration Tailings Slurry that concentration is not more than 5%, and the concentration Tailings Slurry is through 1 ~2 grades of high intensity magnetic separations obtain high intensity magnetic mineral and strong magnetic tail ore deposit, and the high intensity magnetic mineral is merged into iron ore concentrate slurry II, and the strong magnetic tail ore deposit is thrown Tail.
4. low-grade difficulty selects the Efficient beneficiation method of smelting titanomagnetite according to claim 3, it is characterised in that the concentration Tailings Slurry obtains high intensity magnetic mineral II and strong magnetic tail ore deposit II, the high intensity magnetic mineral through the high intensity magnetic separation II that magnetic induction intensity is 1~1.2T II is merged into iron ore concentrate slurry II.
5. low-grade difficulty selects the Efficient beneficiation method of smelting titanomagnetite according to claim 4, it is characterised in that the strong magnetic Concentrate II obtains high intensity magnetic mineral III and strong magnetic tail ore deposit III, the strong magnetic essence through the high intensity magnetic separation III that magnetic induction intensity is 1.2~1.5T Ore deposit III is merged into iron ore concentrate slurry II, and the strong magnetic tail ore deposit III is merged into strong magnetic tail ore deposit II and throws tail.
6. low-grade difficulty selects the Efficient beneficiation method of smelting titanomagnetite according to claim 1, it is characterised in that the step B The obtained mesh of I fineness of fine grained overflow -200 account for more than 75% and concentration be 15~20%.
7. low-grade difficulty selects the Efficient beneficiation method of smelting titanomagnetite according to claim 1, it is characterised in that the low product It is 17~23% that position hardly possible, which selects the Fe grades of smelting titanomagnetite raw ore, TiO2Grade is 4.5~6%, P grades not less than 1%, magnetic iron ore It is not less than 50% in total iron distributive law.
8. low-grade difficulty selects the Efficient beneficiation method of smelting titanomagnetite according to claim 1, it is characterised in that the iron essence The concentration of ore pulp II is not less than 50% not less than 40% and Fe grades.
9. the Efficient beneficiation method of smelting titanomagnetite is selected according to the low-grade difficulty of claim 1 or 8, it is characterised in that the iron Concentrate slurry II feeds elutriation magnetic separator and obtains elutriation concentrate of the concentration not less than 60% and eluriate mine tailing.
10. low-grade difficulty selects the Efficient beneficiation method of smelting titanomagnetite according to claim 9, it is characterised in that the elutriation The water supply pressure of magnetic separator can adjust not less than 0.25MPa, operating voltage 380v, 0~300Gs of magnetic field intensity.
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CN109174398A (en) * 2018-08-02 2019-01-11 汤铁 A kind of comprehensive utilization process of vanadium titano-magnetite
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