The beneficiation new process of weak-magnetic iron ore and special-purpose novel strong magnetic dry separator thereof
The present invention is a kind of beneficiation new process and special-purpose novel strong magnetic dry separator thereof of weak-magnetic iron ore, relates to iron ore dressing technology and equipment technical field.
Existing iron ore dressing technology all is to be magnetic more than 55% stronger rich iron ore to iron-holder, be not suitable for weak-magnetic iron ore, it to iron-holder the ore dressing of＜35% weak-magnetic iron ore, never have a kind of good method, cause a large amount of weak-magnetic iron ores can not utilize, even some area abuses it at an easy rate with industrial building stones, makes it cause the significant wastage of resource.Last century eight, the nineties also once had the technology that adopts the smelting roasting, attempt is the Armco magnetic iron ore that the poor iron ore of di-iron trioxide is reduced to tri-iron tetroxide with iron-holder, but big because of energy consumption, investment is high, low, the of poor benefits practicality that lacks of productive rate, this technology can not be promoted the use of, and be forced to end.Along with industrial expansion and progress of science and technology, and international smart iron powder price is constantly soaring, and how the weak-magnetic iron ore that reserves are bigger adopts the employing that makes it to upgrade of a kind of new technology, is a major issue of benefiting the nation and the people.
Summary of the invention:
The object of the present invention is to provide a kind ofly implement conveniently, investment is less, good energy-conserving effect, can be effectively with the beneficiation new process of the iron-holder enrichment of weak-magnetic iron ore; And for this implementation of processes provide a kind of simple in structure, practicality good, production efficiency is high, applicability is good, can be to directly realizing the novel strong magnetic dry separator that removes thatch, sort than the coarsegrain weak magnetic mineral after the fragmentation.
The object of the present invention is achieved like this,
(1) a kind of beneficiation new process of weak-magnetic iron ore may further comprise the steps:
1. breaking ores is broken for weak-magnetic iron ore＜particle and the powder of 10mm with disintegrating machine;
2. just selecting the newly-designed special equipment of the inventor for use---the magnetic pole place can produce, practicality better strong magnetic dry separator simple in structure up to nearly 20000 Gausses' (GS) high-gradient intense magnetic field the iron ores particle and the powder of iron content composition are efficiently selected, and a large amount of country rocks, dyke rock particle and the powder of sneaking in the mining process are rejected;
The characteristics of this kind strong magnetic dry separator are bigger than in the past strong magnetic dry separator (magnetic field intensity only is 7000～9000 Gausses) magnetic field intensity, it can will realize that than the weak-magnetic iron ore sucking-off of coarsegrain ore deposit, rock separate, and this strong magnetic dry separator is constantly created and is improved through the inventor, its production efficiency is improved greatly, structure more advanced (having applied for utility model patent).This step is one of main points of the present invention, it was both therefrom selected the iron ores particle and the powder of iron content composition fast, and improved the selected grade of ore effectively, for the enforcement of following processing step is had laid a good foundation, again a large amount of nonferrous rock material is rejected, thereby reduced going into to grind, being selected in and measuring in the following processing step widely, thereby made this technology have obvious improvement at aspects such as production efficiency raising, energy saving, production cost reductions.
3. carry and above-mentioned iron ores particle of selecting and powder are delivered to wet ball mill with conveying equipment;
4. grind with wet ball mill will send into＜iron ores particle and the powder of the iron content composition of 10mm grind to form raw ore slurry, so that particle≤74 micron wherein;
5. screening is delivered to high frequency shale shaker with the raw ore slurry of slag stock pump after with above-mentioned grinding and is screened, it meets granular size≤and that 74 microns fine powder raw ore slurry send next step to go with the slag stock pump is selected, and send the powder raw ore slurry of particle＞74 micron back to wet ball mill and grind again;
6. selected will through (5) step screening gained≤74 microns fine powder raw ore slurry carries out selectedly with the Wet-type strong magnetic separator that is at least a section, Wet-type strong magnetic separator divides three the tunnel to export high-grade magnetic fine ore, low-grade magnetic mine tailing breeze respectively and be mingled with low-grade mine tailing breeze and the chats breeze of middle grade magnetic breeze;
7. after dried filter is used filter filtering moisture content with high-grade magnetic fine ore, can obtain the smart iron ore product of enrichment iron amount, its iron-holder can reach 50～55%; Thereby reached the selected purpose of enrichment;
8. the warehouse-in field is delivered to concentrate product stack-up-yard with smart iron ore product with belt conveyor
The mine tailing breeze is delivered to the material delivering stack-up-yard, and material delivering can be made cement plant raw material usefulness,
The conveying of chats breeze is back to wet ball mill sneaks into raw ore slurry through grinding again, or deliver to the material delivering stack-up-yard with low-grade mine tailing breeze.
The present invention a kind ofly carries out enrichment, selected new technology to weak-magnetic iron ore, it can adopt the weak-magnetic iron ore of iron-holder＜35% special equipment of some common equipments and strong magnetic dry separator of the present invention just can realize also insurmountable now to the selected hang-up of the enrichment of weak-magnetic iron ore, iron-holder after it is selected can reach 50～55%, and than existing roasting smelting process good energy-conserving effect, small investment, productive rate height, profitable, production cost is low and enforcement easy to operate.It has good economic worth and practicality, can make reserves this huge resource of weak-magnetic iron ore very big, that be decubitus can obtain good application, and for the enrichment of weak-magnetic iron ore, selectedly opened up an ore dressing new way.
(2) a kind of novel strong magnetic dry separator, comprise support 8, be located at the motor 7 on the support 8, belt transmission device 6, belt 5, separator plate 4 and magnetic control system, magnetic control system includes magnetic pole 1, iron core 9, magnetizing coil 2, yoke 3 and power supply 12, it is characterized in that iron core 9, magnetizing coil 2 and yoke 3 are horizontally placed on the support 8 by supporting 10 every magnetic, yoke 3 levels are located at an end of iron core 9, magnetic pole 1 and yoke 3 corresponding being horizontally disposed with, and be provided with gap e between the two, magnetic pole 1 is two high magnetic conduction electrical pure irons that are cylindrical body, and the periphery of magnetic pole is dentation 111.
The novel strong magnetic dry separator of said structure, can be after the power supply energising, make magnetic control system at the high-gradient magnetic field of the dentation place of magnetic pole 1 generation by magnetizing coil 2 up to nearly 20000 Gausses, when material (ore) takes to herein by belt, the weak-magnetic iron ore of particle≤10mm is magnetized, when this moment, material fell in the high-intensity magnetic field district, non magnetic ore is subjected to gravity and tangent line action of centrifugal force to drop on a zone, and weakly magnetic ore drops on the blanking district owing to the suction that is subjected to high-intensity magnetic field changes falling direction, and difference according to grade in the ore, form the covering of the fan structure that its magnetic pole 1 is designed to not rotate that distributes in the blanking district, pass through by inertia force and frictional force by magnetic pole 1 place at its belt, thereby the magnetic dry separator little (because of not needing the rotatory force of magnetic pole itself) that rotates than existing magnetic pole of the magnetic force that makes the required generation of magnetizing coil, the institute so that it has volume little, the advantage of less energy consumption; Its magnetic pole 1, iron core 9, magnetizing coil 2, yoke 3 is horizontally disposed with this structure in this novel strong magnetic dry separator, it not only makes, and belt transmission device is simple in structure, machine volume is little, the e visual material of sending in gap is different and can regulate between the good and magnetic pole 1 of operational reliability and the yoke 3, and making it applied widely, applicability is good; And this strong magnetic dry separator then makes magnetic induction intensity improve again the architectural feature of the deletion of the magnetic isolation plate between two magnetic poles 1, thereby makes dry-dressing machine performance of the present utility model better, and production efficiency is higher.
By as seen above-mentioned, advantage of the present invention is, it can directly remove thatch to the weakly magnetic ore of particle≤10mm; sort; significantly reduced original preorder work such as fragmentation one fine grinding one filtration to weak magnetic mineral; so not only saved great amount of manpower; material resources; financial resources; saved the energy in a large number; and greatly improved production efficiency and economic benefit; thus be weakly magnetic ore such as bloodstone; a less energy consumption has been opened up in the primary election of martite; profitable; the new way that output is high, and this strong magnetic dry separator itself is simple in structure; volume is little; practicality is good: and can significantly improve for weak-magnetic iron ore fine ore the grade place mat basis.
Description of drawings
Fig. 1 is the flow chart of the beneficiation new process of a kind of weak-magnetic iron ore of the present invention
Fig. 2 is the flow chart of the embodiment of the invention 1
Fig. 3 is the structural representation of strong magnetic dry separator of the present invention
Fig. 4 is the schematic diagram of magnetic control system part in the strong magnetic dry separator shown in Figure 3
Fig. 5 is the structural representation of magnetic pole
The specific embodiment
(1) Fig. 1. be the beneficiation new process of a kind of weak-magnetic iron ore of the present invention, its concrete steps, in summary of the invention, narrated, Fig. 2 is embodiments of the invention 1, in order to increase benefit, the iron-holder of smart iron ore product is reached 〉=55%, the chats breeze increase of gained in selected can be returned to this additional step of wet ball mill again so that its grind once more, screening, selected.
According to new technology of the present invention, the inventor has carried out small-scale test in the bloodstone place of production in Chinese Hebei province, has obtained good effect, and its specific embodiments is:
1. earlier tcrude ore is crushed to particle less than 20mm, enters the counter beating hammer type disintegrator fragmentation again, iron ore particle is broken into＜particle and the powder of 8mm with jaw crusher;
2. select the iron ores particle and the powder of iron content composition with strong magnetic dry separator of the present invention, and with country rock and the dyke rock particle and the powder rejecting of sneaking into;
3. the iron ores particle of the iron content composition of step 2 being selected and powder enter wet ball mill by electro-vibrating feeder and belt conveyer scale;
4. with wet ball mill the iron ores particle sent into and powder are worn into the microfine raw ore slurry of grain graininess≤74 micron;
5. with the wet slag pump microfine raw ore slurry is delivered to high frequency shale shaker screening, with conform to≤raw ore slurry of 74 microns particle delivers to next step and goes selectedly, more coarse grained raw ore slurry that will＞74 microns is then sent into ball mill once more and is ground;
With two sections strong magnetic wet separation machines to send here≤74 microns microfine raw ore slurry carries out selected, promptly select by the first section strong magnetic wet separation of the flat ring type of electromagnetism machine earlier, the high-grade magnetic fine ore of then this being selected is selected by the second section strong magnetic wet separation of the flat ring type of electromagnetism machine more again, can obtain fine ore of high grade; The strong magnetic wet separation machine that ore dressing is at present used has kinds such as Jones's type, DCH type.
7. gained high-grade fine ore is filtered moisture content through the outside filtering type vacuum filter, and obtain the concentrate product of iron-holder≤60%, and deliver to smart iron ore stack-up-yard.
Two sections strong magnetic wet separation machine gained chats ore particles in (6) are delivered to wet ball mill again and other mineral are mixed together grinding, and the mine tailing ore particle that two sections strong magnetic wet separation machines are exported is delivered to the material delivering stack-up-yard.
Present embodiment is at the additional step that increases " the chats breeze is sent into wet ball mill again and ground " with after adopting two sections strong magnetic wet separation machines to carry out selected technology, production efficiency is increased, and make about iron-holder≤60% of concentrate product, this technology is that the ore-dressing technique of weak-magnetic iron ore has been opened up a new way, and because the general equipment that adopts all is mining equiment commonly used, thereby make this process implementing easy and newly-designed strong magnetic dry separator special equipment is simple in structure and easy enforcement applicability easy to make is good, and good energy-conserving effect, small investment, the production efficiency height, and general ore dressing plant all can be implemented, has good economic worth and practicality and outstanding creativeness so easily promote.
(2) Fig. 3,4 are depicted as the strong magnetic dry separator of present embodiment, include support 8 and the motor 7 that is arranged on the support 8, belt transmission device 6, belt 5, separator plate 4 and magnetic control system, magnetic control system is by magnetic pole 1, iron core 9, magnetizing coil 2, yoke 3 and power supply 12 are formed, iron core 9, magnetizing coil 2, yoke 3 is horizontally placed on the support 8 by supporting 10 every magnetic, magnetic pole 1 is for being the high magnetic conduction electrical pure iron of cylindrical body, its surface is dentation 111 (referring to Fig. 5), two groups of magnetizing coils 2 use and are arranged at (referring to Fig. 4) on the iron core 9 for series connection, iron core 9 is and is horizontally disposed with, the one end is provided with yoke 3, magnetic pole 1 is corresponding with yoke 3, be and be horizontally disposed with, and be provided with the gap e that belt and material pass through between the two, when magnetizing coil 2 links to each other energising with power supply 12 after, dentation 111 places at magnetic pole 1 just produce the high-gradient magnetic field up to nearly 20000 Gausses (Gs), be delivered to this place, magnetic field when material (ore) drives belt transmission devices by motor 7, the weakly magnetic ore of≤10mm is just magnetized by high-intensity magnetic field and changes the whereabouts track and be sorted out.Be arranged at separator plate 4 on the support 8 in the present embodiment and be one and can change angle along strong point swing, regulate the angle of separator plate, can change the ore that sorts different content (grade), thereby select want the ore of the grade that reaches, the separator plate non-magnet material, the material that separator plate adopts in the present embodiment is a stainless steel.
In the present embodiment, in order to increase the intensity of magnetization of magnetic field to weakly magnetic ore, belt 5 is ultrathin high-intensity polyurethane (PU) belt, and the magnetization so that the spacing of weakly magnetic ore on the belt and magnetic pole reduces as far as possible to ore is strengthened.
In the present embodiment, current, durable for the ease of belt, dentation 111 parts of magnetic pole 1 periphery can be filled a packed layer 112 with non-magnet material atom ash, can paste on its surface one as thin as a wafer, smooth polytetrafluoroethylene (PTFE) guiding wearing layer 113.
In the present embodiment, in order to guarantee the high-gradient magnetic field at magnetic pole place, adopt the power supply that is output as 80V/200A, magnetizing coil adopts the axial flow blower air blast cooling of two 300mm, air blast cooling can be controlled at the temperature rise of coil in 40 ℃, has saved electric energy loss, and the volume of coil is reduced.The reasonable cornerite at magnetic pole and iron core place has reduced leakage field.
In the present embodiment, all kinds of weak big I of magnetic ore suction are adjusted when making the ore dressing of this strong magnetic dry separator, can one horizontally moving device 11 be set at magnetic pole 1 center position, can regulate the spacing e between yoke 3 and the magnetic pole 1.The setting of this horizontally moving device makes the applicability of this strong magnetic dry separator better, and production efficiency is higher, uses more convenient.
The strong magnetic dry separator of present embodiment it can right≤10mm granularity weak magnetic bloodstone stone sort, thereby significantly reduced original workload to fragmentation-grinding-operations such as filtration a large amount of in the magnetic magnetic mineral, saved great amount of manpower, material resources, financial resources, saved a large amount of energy, and be the enrichment of magnetic ores such as bloodstone stone, selected upgrading created condition, and has good economic worth, and this strong magnetic dry separator is simple in structure, unique, easy to use, the production efficiency height, the wide characteristics that wait of applicability make it have fabulous novelty again, creativeness and practicality.