CN102430473A - Pre-selecting and tailings discarding process of lean magnetite ores - Google Patents
Pre-selecting and tailings discarding process of lean magnetite ores Download PDFInfo
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- CN102430473A CN102430473A CN2011103204878A CN201110320487A CN102430473A CN 102430473 A CN102430473 A CN 102430473A CN 2011103204878 A CN2011103204878 A CN 2011103204878A CN 201110320487 A CN201110320487 A CN 201110320487A CN 102430473 A CN102430473 A CN 102430473A
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Abstract
The invention discloses a pre-selecting and tailings discarding process of lean magnetite ores, comprising three stages: a coarse crushing stage, an intermediate crushing stage and an ultra-fine crushing stage, wherein fine crushing operation stage can be increased before the ultra-fine crushing stage and after the intermediate crushing stage. The staged magnetic pre-separation and tailings discarding work can be executed by different types of magnetic separators according to the difference of granularity of each crushing stage. Surrounding rocks and partial dissociatve gangue which drop in the tailings are removed in the first discarding work; waste stones which are not removed in the first tailings discarding work and the gangue which is further dissociated after the intermediate crushing stage are removed in the secondary tailings discarding work; and the third tailings discarding work is to discard the tailings after the tailings are ultra-finely crushed by a high-pressure roller mill. After the lean magnetite ores in which the fine particles are embedded are ultra-finely crushed by the high-pressure roller mill, the dissociation degree is further improved, and the magnetic separating and tailings discarding effects are good. The tailings discarding work is designed to reduce the loss of ferrous metal. The complete process can effectively improve the grade of grinding ferrous, can ensure the TFe recovery rate of the work, can improve the grinding characteristics of the material in the grinder, can reduce the quantity of the ore to be grinded, and can reduce the energy consumption of grinding the ores and the cost of separating the ores.
Description
Technical field
The invention belongs to the magnetite separation technical field, relate to a kind of poor magnetic iron ore tailings discarding by preconcentration technology specifically.
Background technology
Along with developing rapidly of China's steel and iron industry, iron and steel enterprise is to the demand and day sharp increase of iron ore, and many, big ore deposit is few and the characteristics of China's iron ore deposit are medium and small ore deposits; Lean ore is many, rich ore is few, and 97% iron ore is the poor iron ore below the iron grade 30%Fe, and associated minerals are many, the selecting and purchasing difficulty is big, production cost is high; Lacking of market competition ability; Production can not be met the need of market, and insufficiency of supply-demand continues to enlarge, and thus the international market has been produced severe dependency.China's iron ore import volume had risen to 6.27 hundred million tons in 2009.Significantly increasing with import volume and to accompany, is raising up fast of iron ore price.From 2005 to 2010, the steel valency index amount of increase of China was 33%, and the ore deposit valency amount of increase of the same period is 116%.China should occupy leading position as the maximum buyer of global iron ore in price negotiation, but China does not grasp dominant right on the iron ore price regrettably, is but clamped down on by the seller on the contrary.In in the past several years; Though with the China Steel enterprise representative headed by the Baosteel participated in international three big ferrolite supply merchant BHP Billiton, made every effort to open up, fresh water river valley iron ore price negotiates; But all must not accept the fact of big bulge in price at last; Pricing mechanism also becomes the price first quarter one from 1 year one price, and Chinese Enterprise is endured the hardship of iron ore monopolization to the fullest extent, and this has seriously restricted the development of Iron and Steel Enterprises in China.
For these reasons, as world steel output first big country, the supply of iron ore will at first be based on our country, and excavates domestic poor, fine iron ore potentiality, does " enriched ore ", improves resource utilization; Next is only from the rich iron ore of external import some.Development and use for poor iron ore will be strengthened tailings discarding by preconcentration; Implement the policy of " how broken few throwing early of grinding, can throw "; Adopt magnetic separator to carry out preliminary election, the part barren rock of sneaking into is gone into preceding in time throwing of mill remove, improve the selected grade of ore going into ore grinding stone; Reduce the barren rock amount in the subsequent job, save the energy consumption of ore grinding and sorting operation.
China is decided to be 20% from the angle of Technological Economy utilization with the cutoff grade of magnetic iron ore, and grade is lower than 20% the ultra-poor magnetic iron ore that is called.Explored ultra-poor magnetic iron ore reserves at present in all parts of the country have 10,000,000,000 tons more than, develop these ultra-poor resource of magnetite and have broad prospects.The magnetic iron ore amount is low, disseminated grain size is thin because poor magnetic iron ore contains, if granularity is thicker after the ore reduction, is difficult to reach liberation degree of minerals preferably, influences the magnetic separation effect.The tailings discarding by preconcentration amount goes into that mill amount ore deposit amount is big, to go into to grind grade low after a little while, causes power consume big; Increased the ore grinding cost, when perhaps the tailings discarding by preconcentration amount was excessive, the loss late of magnet mineral was big; Cause the wasting of resources, beneficiation cost increases, and these are the crucial difficult problems in the ultra-poor magnetic iron ore development and use.Therefore will be according to the granularity embedding cloth situation of ultra-poor magnetic iron ore, it is crushed to more suitable fine granularity after, just possess the condition of throwing tail in advance before the mill.Present technology adopt corase grind to sort more or in the broken method that sorts realize the tailings discarding by preconcentration of ultra-poor magnetic iron ore; But the corase grind grading process makes beneficiation cost height and efficient lower than on the low side because of the high energy consumption of ore grinding, high steel consume; And in broken grading process to the ultra-poor magnetic iron ore of fine-grained disseminated grain because of fragmentation after granularity thicker, liberation degree of minerals is not enough, influences the tailings discarding by preconcentration effect; And mill feed size is big, the waste power consume.Therefore, further reduce mill feed size, improve and to go into to grind grade, the ore grinding characteristic of significantly increase the fine ore amount, improving mill feed material is to solve the high effective means of China's poor magnetic iron ore processing and utilization cost.
Summary of the invention
The object of the invention provides a kind of poor magnetic iron ore tailings discarding by preconcentration technology to existing weak point in the above-mentioned prior art just; This technology is starting point with " how broken few mill "; Adopt ultra-fine broken operation that the ultra-poor magnetic iron ore of fine-grained disseminated grain is in small, broken bits to suitable particle size; Under liberation degree of minerals situation preferably, carry out magnetic separation and throw the tail operation.Ultra-poor magnetic iron ore can be abandoned a large amount of mine tailings after this PROCESS FOR TREATMENT, not only improved and gone into to grind the iron grade, reduced power consume and subsequent job cost, and magnet mineral loss late is little, has solved the crucial difficult problem in the ultra-poor magnetic iron ore development and use.
The object of the invention can be realized through following technique measures:
Poor magnetic iron ore tailings discarding by preconcentration technology of the present invention may further comprise the steps:
A, raw ore is carried out preliminary election screening; Step sizing 100 ~ 200mm; Product is thrown the tail operation with the undersized product mixing after magnetic pulley or lump ore dry type permanent magnetic separator carry out the premagnetization choosing on the sieve after coarse crushing, the country rock that the jettisoning exploitation is sneaked into and the gangue that partly dissociated;
B, the magnetic material after magnetic pulley is thrown tail is sieved upper sieve screen size 40 ~ 50mm, bottom sieve screen size 15 ~ 20mm through double deck screen; Bottom sieve sieve is gone up, undersized product carries out the dry type permanent-magnet concentration and throws the tail operation, and mine tailing is scanned operation, scans gained magnetic product and sneaks in the throwing tail operation magnetic product; On the sieve in the product broken after, return the double deck screen check screening;
C, b step gained is thrown tail operation magnetic product carry out the ultra-fine broken operation of high-pressure roller mill; Ultra-fine broken back material is through the check screening of screen size 3 ~ 5mm screening machine, and it is broken again that oversize returns high-pressure roller mill, and the tail operation is thrown in qualified undersized product particulate magnetic separation; The a large amount of mine tailings of jettisoning; And mine tailing scanned operation, and reduce ferrous metal and run off, increase the TFe rate of recovery.Scan gained magnetic product and magnetic separation and throw tail operation gained rough concentrate and concentrate and feed the ore grinding storehouse, carry out follow-up mill and be elected to be industry;
D, to select the upper sieve screen size when the described double deck screen of b step be 40 ~ 50mm; Bottom sieve screen size is 3 ~ 5mm (identical with check screening screen size behind the high pressure roller mill crusher machine); Bottom sieve screenings directly feeds magnetic separator and throws the tail operation; Bottom sieve oversize feeds high-pressure roller mill, the upper sieve oversize through in return double deck screen after broken.
Technological process of the present invention be divided into coarse crushing, in broken and ultra-fine broken three phases, in case of necessity can ultra-fine broken before, in broken back increase operation in small, broken bits, according to the difference of each broken stage granularity, select the magnetic separator of different model for use, carry out the premagnetization choosing and throw the tail operation.Once throw tail and remove country rock of sneaking into wherein and the gangue that partly dissociates; Secondary throw tail throw remove once throw barren rock that tail is not removed with in the gangue that further dissociates after broken; Throwing tails for three times is that particulate is thrown tail, the fine-grained disseminated grain material through high-pressure roller mill ultra-fine broken after, degree of dissociation further improves; Magnetic separation throwing tail amount is big, scans operation for preventing ferrous metal loss design mine tailing.Whole process flow can effectively improve into mill iron grade, guarantees the operation TFe rate of recovery, reduces and goes into to grind ore amount, reduces power consume and beneficiation cost.
The tube Surface field intensity of magnetic pulley is about 300mT in the magnetic pulley tailings discarding by preconcentration operation in the technological process of the present invention; The tube surface that the dry type permanent-magnet concentration is thrown magnetic separator in the tail operation is about 200mT for magnetic field intensity; The tube Surface field intensity that magnetic separator in the tail operation is thrown in magnetic separation is about 180mT, and the Armco magnetic iron mineral rate of recovery and grade raising are taken into account in choosing of magnetic field intensity; Ultra-fine broken use high-pressure roller mill.
Technical characterstic of the present invention is following:
(1) stage crushing, stage are thrown tail.Under the prerequisite that guarantees the magnet mineral recovery rate, can throw early and throw, the operation of different grain size rank mineral aggregate employing stage throwing tail.After the coarse crushing bulk materials is carried out magnetic pulley and throws tail, abandon the gangue that the country rock of sneaking into wherein and part are dissociated, in broken and ultra-fine broken throwing tail operation, other non magnetic ore of gangue intergrowth level that jettisoning has dissociated.Tail operation raising iron grade is thrown in magnetic separation, has reduced ore grinding amount and subsequent job load, and mine tailing is scanned operation can reduce the ferrous metal excessive bleed;
(2) the ultra-fine broken and vibratory sieve composition closed circuit circulatory system of high-pressure roller mill.The fine-grained disseminated grain material only reaches certain liberation degree of minerals, just can have good magnetic separation to throw the tail effect.According to the mineral aggregate disseminated grain size, throw tail operation material size through system's strict control magnetic separation that high-pressure roller mill and vibratory sieve are formed, obtain the higher needs of going into to grind grade and a large amount of qualified tailings of jettisoning to satisfy; The ultra-fine broken ability of high-pressure roller mill produces a large amount of particulate, microfine and the thick middle particulate that enriches the internal stress crackle is arranged; Material grinding work index significantly reduces after this means roller; The subsequent ball milling system processing power significantly rises, unit power consumption significantly descends; And it is low that high-pressure roller mill self has energy consumption, the characteristics that efficient is high;
(3) permanent-magnet concentration is thrown tail operation consumption characteristics low, simple to operate, in the ore dressing plant of reality produces, implements easily, and operational management is convenient.If select for use dry type magnetic separation to throw tail fully, also can reduce the restriction that receives water resource.
Beneficial effect of the present invention is following:
(1) before going into mill, abandon a large amount of barren rocks and namagnetic substance, improve and go into to grind the iron grade, and the barren rock of abandoning can be used as building, build the road and wait some other engineering materials;
(2) application of high-pressure roller mill has reduced grinding particle size, has increased fine ore content, improved the ore grinding characteristic of mill feed material, and the high-pressure roller mill energy consumption is low, efficient is high;
(3) can effectively reduce power consume, reduce the subsequent job treating capacity, improve utilization rate of equipment and installations, production cost decreases, and has good economic benefit.
Description of drawings:
Fig. 1 is a kind of process chart of the present invention.
Fig. 2 is an another kind of process chart of the present invention.
The specific embodiment:
To combine embodiment (accompanying drawing) to further describe below the present invention:
Embodiment 1
As shown in Figure 1; A, raw ore is carried out preliminary election screening; Step sizing 100 ~ 200mm, product is thrown the tail operation with the undersized product mixing after magnetic pulley or lump ore dry type permanent magnetic separator carry out the premagnetization choosing on the sieve after coarse crushing, the country rock that the jettisoning exploitation is sneaked into and the gangue that partly dissociated;
B, the magnetic material after magnetic pulley is thrown tail is sieved upper sieve screen size 40 ~ 50mm, bottom sieve screen size 15 ~ 20mm through double deck screen; Bottom sieve sieve is gone up, undersized product carries out the dry type permanent-magnet concentration and throws the tail operation, and mine tailing is scanned operation, scans gained magnetic product and sneaks in the throwing tail operation magnetic product; On the sieve in the product broken after, return the double deck screen check screening;
C, the b step is thrown tail operation gained magnetic product carry out the ultra-fine broken operation of high-pressure roller mill, ultra-fine broken back material is through screen size 3mm ~ 5mm screening machine check screening, and it is in small, broken bits again that oversize returns high-pressure roller mill; Qualified undersized product carries out the particulate magnetic separation and throws the tail operation, a large amount of mine tailings of jettisoning, and mine tailing scanned operation; Reducing ferrous metal runs off; Increase the TFe rate of recovery, scan gained magnetic product and magnetic separation and throw tail operation gained rough concentrate and concentrate and feed the ore grinding storehouse, carry out follow-up mill and be elected to be already.
Present embodiment is with original ore size 1000 ~ 0mm, and processing raw ore amount is that the poor magnetic iron ore magnetic separation throwing tail of 50t/h is an example, can carry out lectotype selection with reference to following scheme:
Equipment adopts in the coarse crushing operation: Sandvik 1211HD jaw crusher, ore discharge granularity≤200mm.In in the broken operation equipment adopt: Sandvik H3800 standard cone crusher, ore discharge granularity≤45mm.In in the broken closed-circuit screen operation break-down equipment adopt: SSZ
21250 * 2500 double-deck self-fixed centre shale shakers, upper strata screen mesh are 45mm, and the lower screen sieve aperture is 15mm.Equipment adopts in ultra-fine broken operation: RPBR16-170/180 type high-pressure roller mill can produce the product of a large amount of 3mm ~ 45 μ m.Equipment adopts in ultra-fine broken closed-circuit screen operation break-down: SZZ type 1500 * 4000 self-fixed centre shale shakers, screen mesh size 3mm, partition size 3mm.Throw equipment employing in the tail operation 1 in the choosing of dry type premagnetization: CTDG-0808 permanent magnetism dry dressing device, tube surface induction intensity 300mT, maximum material size 200mm.Throw equipment employing in the tail operation 2 at the dry type permanent-magnet concentration: CTZ50/50 dry type permanent magnetic separator, tube surface induction intensity 220mT, maximum material size 50mm.Throw equipment employing in tail 3 operations in magnetic separation: CTB1021 Wet-type permanent magnet drum type magnetic separator, tube surface induction intensity 180mT, maximum material size 3mm; Or CG3 updraft type dry type permanent magnetic separator; Tube surface induction intensity: strong magnetic roller 550mT, weak magnetic roller 400mT, selected maximum particle size 15mm.
Embodiment 2
As shown in Figure 2; The difference of present embodiment and embodiment 1 is: it is 40 ~ 50mm that the double deck screen of b step is selected the upper sieve screen size; Behind bottom sieve screen size and the high pressure roller mill crusher machine check screening screen size identical (be 3 ~ 5mm); Bottom sieve screenings directly feeds CTB1021 Wet-type permanent magnet drum type magnetic separator or CG3 updraft type dry type permanent magnetic separator is thrown the tail operation, and it is ultra-fine broken that bottom sieve oversize is delivered to high-pressure roller mill, the upper sieve oversize through in return double deck screen after broken.
Claims (2)
1. poor magnetic iron ore tailings discarding by preconcentration technology, it is characterized in that: said technology may further comprise the steps:
A, raw ore is carried out preliminary election screening; Step sizing 100 ~ 200mm; Product is thrown the tail operation with the undersized product mixing after magnetic pulley or lump ore dry type permanent magnetic separator carry out the premagnetization choosing on the sieve after coarse crushing, the country rock that the jettisoning exploitation is sneaked into and the gangue that partly dissociated;
B, the magnetic material after magnetic pulley is thrown tail is sieved upper sieve screen size 40 ~ 50mm, bottom sieve screen size 15 ~ 20mm through double deck screen; Bottom sieve sieve is gone up, undersized product carries out the dry type permanent-magnet concentration and throws the tail operation, and mine tailing is scanned operation, scans gained magnetic product and sneaks in the throwing tail operation magnetic product; On the sieve in the product broken after, return the double deck screen check screening;
C, b step gained is thrown tail operation magnetic product carry out the ultra-fine broken operation of high-pressure roller mill; Ultra-fine broken back material is through the check screening of screen size 3 ~ 5mm screening machine, and it is broken again that oversize returns high-pressure roller mill, and the tail operation is thrown in qualified undersized product particulate magnetic separation; The a large amount of mine tailings of jettisoning; And mine tailing scanned operation, and reduce ferrous metal and run off, increase the TFe rate of recovery; Scan gained magnetic product and magnetic separation and throw tail operation gained rough concentrate and concentrate and feed the ore grinding storehouse, carry out follow-up mill and be elected to be industry;
D, to select the upper sieve screen size when the described double deck screen of b step be 40 ~ 50mm; Bottom sieve screen size is 3 ~ 5mm; Bottom sieve screenings directly feeds magnetic separator and throws the tail operation, and bottom sieve oversize feeds high-pressure roller mill, the upper sieve oversize through in return double deck screen after broken.
2. poor magnetic iron ore tailings discarding by preconcentration technology according to claim 1: it is characterized in that: the tube Surface field intensity of magnetic pulley is about 300mT in the operation of described magnetic pulley tailings discarding by preconcentration; The tube surface that the dry type permanent-magnet concentration is thrown magnetic separator in the tail operation is about 200mT for magnetic field intensity, and the tube Surface field intensity that magnetic separator in the tail operation is thrown in magnetic separation is about 180mT.
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Application publication date: 20120502 |