CN106362859A

CN106362859A - System and method for preparing low-sulfur iron powder

Info

Publication number: CN106362859A
Application number: CN201611052254.3A
Authority: CN
Inventors: 王健月; 王福佳; 古明远; 曹志成; 薛逊; 吴道洪
Original assignee: Jiangsu Province Metallurgical Design Institute Co Ltd
Current assignee: Jiangsu Province Metallurgical Design Institute Co Ltd
Priority date: 2016-11-24
Filing date: 2016-11-24
Publication date: 2017-02-01

Abstract

The invention discloses a system and a method for preparing low-sulfur iron powder. The system comprises a microwave pretreatment unit, a crushing device, an ore grinding and magnetic separating unit and a flotation unit, wherein the microwave pretreatment unit is provided with a metalized pellet inlet and microwave pretreated pellet outlet; the crushing device is provided with a microwave pretreated pellet inlet and a crushed material outlet; the ore grinding and magnetic separating unit is provided with a crushed material inlet, a sulfur-containing metal iron powder outlet and a tailings outlet; the flotation unit is provided with a sulfur-containing metal iron powder inlet, a pH regulating agent inlet, a collecting agent inlet, a foaming agent inlet, a low-sulfur iron powder outlet and a ferrous sulfide outlet. The system can be used for treating a metalized pellet to obtain low-sulfur iron powder (the sulfur content can be reduced to about 0.1%), and the product quality is improved, so full utilization of iron-containing resources is widened, and full recycle (the grade and recovery rate of iron can be as high as 90%) of iron element and sulfur element is realized as well.

Description

The system and method preparing low-sulfur iron powder

Technical field

The invention belongs to resource regeneration technical field, specifically, the present invention relates to preparing the system of low-sulfur iron powder And method.

Background technology

China's iron ore deposit mainly has the characteristics that " lean ", " thin ", " miscellaneous ", and average Iron grade 32% is average ferrum than the world Grade is low 11 percentage points.Iron ore is as the primary raw material of steel industry, it usually needs could enter after beneficiation enrichment Blast furnace process.With the fast development of steel and iron industry, some easily select iron mine and the higher rich ore of Iron grade constantly to consume.Therefore such as What effective exploitation utilizes some Low-grade and hard-to-separate iron ore such as bauxite, high-phosphor oolitic hematite etc. and some industrial solid castoffs As the iron-containing resources such as Bayer process red mud, copper ashes, nickel slag, lead and zinc smelting dreg become main research direction.

Through retrieval existing document and patent, pass through tunnel cave, rotary kiln, shaft furnace or rotary hearth furnace and processed above-mentioned iron content Resource produces metallized pellet, and then the technique that mill ore magnetic selection produces metal iron powder.These from metallized pellet reduction roasting- One shortcoming of the technology of magnetic separation recovery ferrum is due to containing sulfur in raw material in itself, and the complicated component of sulfur not easily pass through flotation or Other modes remove on source, and need the coal adding sulfur-bearing as reducing agent in reduction process, therefore lead to The metal iron powder sulfur-bearing that this flow process obtains is higher, product quality poor it is impossible to directly as product sell；Another shortcoming is To iron powder product grade and the response rate not high it is impossible to sufficiently be recycled to ferrum element.

Therefore, the existing technology processing iron-containing resource is further improved.

Content of the invention

It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.For this reason, the present invention One purpose is to propose a kind of system and method preparing low-sulfur iron powder, and carrying out process using this system to metallized pellet can To obtain low-sulfur iron powder (sulfur content can be down to 0.1% about), improve the quality of product, thus fully sharp widening iron-containing resource With while realize the abundant recycling (Iron grade and the response rate are up to 90%) of ferrum element and element sulphur.

In one aspect of the invention, the present invention proposes a kind of system preparing low-sulfur iron powder.Reality according to the present invention Apply example, described system includes:

Microwave pretreatment device, described microwave pretreatment device has metallized pellet entrance and microwave pretreatment pelletizing goes out Mouthful；

Breaker, described breaker has microwave pretreatment pelletizing entrance and broken material outlet, and described microwave is located in advance Reason pelletizing entrance is connected with the outlet of described microwave pretreatment pelletizing；

Ore grinding-magnetic separating unit, described ore grinding-magnetic separating unit has broken material entrance, the outlet of sulfur-bearing metal iron powder and mine tailing Outlet, described broken material entrance is connected with the outlet of described broken material；

Flotation unit, described flotation unit has sulfur-bearing metal iron powder entrance, ph regulator entrance, collecting agent entrance, rises Infusion entrance, the outlet of low-sulfur iron powder and Iron sulfuret. outlet, described sulfur-bearing metal iron powder entrance and described sulfur-bearing metal iron powder go out Mouth is connected.

Thus, the according to embodiments of the present invention system preparing low-sulfur iron powder is passed through using microwave pretreatment device to metal Pellet carries out pretreatment, and one side microwave irradiation metallized pellet can make the temperature of metallized pellet raise, due to metal Ferrum in pellet is different with the thermal conductivity of other gangue minerals, leads to the thermal shock that the thermal stress producing because of thermograde causes Destroy also different, so that metallized pellet can realize selective crushing；On the other hand, the energy of microwave radiation can make to contain Fe s key in sulfur mineral obtains energy, so that the reactivity of containing sulfur minerals strengthens, is conducive to entering of follow-up flotation flowsheet OK, carry out, from there through supplying metallized pellet, the monomer solution that pretreatment had both promoted mineral to microwave pretreatment device From thus improving follow-up grinding efficiency, improve the floatability of containing sulfur minerals so that not requiring the use of work in follow-up flotation flowsheet again Agent, reduces cost, then successively microwave pretreatment pelletizing is carried out with broken and ore grinding-magnetic separation process so that microwave is pre- Process pelletizing Minerals monomer fully to dissociate, such that it is able to fully select sulfur-bearing metal iron powder therein, be conducive to iron content to provide The recovery in source and follow-up sulfur reduction are processed, and then gained sulfur-bearing metal iron powder, ph regulator, collecting agent and foaming agent are carried out flotation Process, after sulfur-bearing metal iron powder mix homogeneously in water, ph regulator can adjust solution to suitable acid-base value, and collecting Agent, due to its selective absorption, can be adsorbed on containing sulfur minerals surface, thus changing the surface activity of containing sulfur minerals, foaming agent is permissible Containing sulfur minerals are made to be brought out in the presence of bubble, thus realizing being sufficiently separated of metallic iron and containing sulfur minerals, and then not only The relatively low metal iron powder of sulfur-bearing can be obtained, and can fully reclaim the Sulphur ressource in sulfur-bearing metal iron powder.Thus, using this System carries out process and can obtain low-sulfur iron powder (sulfur content can be down to 0.1% about) to metallized pellet, improves the matter of product Amount, thus widen realize ferrum element and element sulphur while iron-containing resource makes full use of abundant recycling (Iron grade and The response rate is up to 90%).

In addition, the system preparing low-sulfur iron powder according to the above embodiment of the present invention can also have the technology added as follows Feature:

In some embodiments of the invention, described ore grinding-magnetic separating unit includes being sequentially connected primary grinding device, one Stages of magnetic separation device, secondary grinding device and two-stage nitration concentration equipment.Thus, it is possible to significantly improve ferrum element and sulfur in metallized pellet Element recovery rate.

In some embodiments of the invention, described primary grinding device and secondary grinding device are separately rod milling Machine or ball mill.Thus, it is possible to improve ferrum element and the element sulphur response rate in metallized pellet further.

In some embodiments of the invention, a described stages of magnetic separation device and two-stage nitration concentration equipment are separately magnetic separation Machine or magnetic separation tube.Thus, it is possible to improve ferrum element and the element sulphur response rate in metallized pellet further.

In another aspect of the invention, the present invention propose a kind of prepared using the above-mentioned system preparing low-sulfur iron powder low The method of diametan.According to embodiments of the invention, methods described includes:

(1) metallized pellet is supplied and carry out pretreatment to described microwave pretreatment device, obtain microwave to locate in advance Reason pelletizing；

(2) described microwave pretreatment pelletizing is supplied and carry out break process to described breaker, to be crushed Material；

(3) described broken material is supplied and carry out ore grinding-magnetic separation process to described ore grinding-concentration equipment, to be contained Sulfur metal iron powder and mine tailing；

(4) described sulfur-bearing metal iron powder, ph regulator, collecting agent and foaming agent are supplied and carry out to described flotation unit Flotation is processed, to respectively obtain low-sulfur iron powder and Iron sulfuret..

Thus, the according to embodiments of the present invention method preparing low-sulfur iron powder is passed through using microwave pretreatment device to metal Pellet carries out pretreatment, and one side microwave irradiation metallized pellet can make the temperature of metallized pellet raise, due to metal Ferrum in pellet is different with the thermal conductivity of other gangue minerals, leads to the thermal shock that the thermal stress producing because of thermograde causes Destroy also different, so that metallized pellet can realize selective crushing；On the other hand, the energy of microwave radiation can make to contain Fe s key in sulfur mineral obtains energy, so that the reactivity of containing sulfur minerals strengthens, is conducive to entering of follow-up flotation flowsheet OK, carry out, from there through supplying metallized pellet, the monomer solution that pretreatment had both promoted mineral to microwave pretreatment device From thus improving follow-up grinding efficiency, improve the floatability of containing sulfur minerals so that not requiring the use of work in follow-up flotation flowsheet again Agent, reduces cost, then successively microwave pretreatment pelletizing is carried out with broken and ore grinding-magnetic separation process so that microwave is pre- Process pelletizing Minerals monomer fully to dissociate, such that it is able to fully select sulfur-bearing metal iron powder therein, be conducive to iron content to provide The recovery in source and follow-up sulfur reduction are processed, and then gained sulfur-bearing metal iron powder, ph regulator, collecting agent and foaming agent are carried out flotation Process, after sulfur-bearing metal iron powder mix homogeneously in water, ph regulator can adjust solution to suitable acid-base value, and collecting Agent, due to its selective absorption, can be adsorbed on containing sulfur minerals surface, thus changing the surface activity of containing sulfur minerals, foaming agent is permissible Containing sulfur minerals are made to be brought out in the presence of bubble, thus realizing being sufficiently separated of metallic iron and containing sulfur minerals, and then not only The relatively low metal iron powder of sulfur-bearing can be obtained, and can fully reclaim the Sulphur ressource in sulfur-bearing metal iron powder.Thus, using this Method carries out process and can obtain low-sulfur iron powder (sulfur content can be down to 0.1% about) to metallized pellet, improves the matter of product Amount, thus widen realize ferrum element and element sulphur while iron-containing resource makes full use of abundant recycling (Iron grade and The response rate is up to 90%).

In addition, the method preparing low-sulfur iron powder according to the above embodiment of the present invention can also have the technology added as follows Feature:

In some embodiments of the invention, in step (1), described metallized pellet is to process aluminum using calciner At least one in Tu Kuang, high-phosphor oolitic hematite, red mud, copper ashes, nickel slag and lead and zinc smelting dreg obtains.Thus, it is possible to it is aobvious Write and improve resource utilization.

In some embodiments of the invention, in step (1), described calciner be tunnel cave, rotary kiln, shaft furnace or Rotary hearth furnace.

In some embodiments of the invention, in step (1), the degree of metalization of described metallized pellet is 80～ 95%.

In some embodiments of the invention, in step (1), in described metallized pellet full weight of iron fraction be 25～ 60%, metallic iron mass fraction be 20～57%, quality of alumina fraction be 15～25%, siliconoxide mass fraction be 13～ 27%, calcium oxide mass fraction is 5～15%, and sulfur nutrient is 2～5%.

In some embodiments of the invention, in step (1), in described preprocessing process microwave frequency be 300mhz～ 300ghz, microwave power is 300～700w, and process time is 10～30min.Thus, it is possible to promote metallized pellet Minerals Monomer dissociation, thus follow-up grinding efficiency not only can be significantly improved, and can improve containing sulfur minerals floatability so that Do not require the use of activator in follow-up flotation flowsheet, reduce cost.

In some embodiments of the invention, in step (2), the particle diameter of described broken material is not higher than 2mm.Thus, may be used Significantly improve the efficiency of follow-up ore grinding-magnetic separation.

In some embodiments of the invention, in step (3), the step that described ore grinding-magnetic separation is processed is: (3-1) will Described broken material supplies and carries out primary grinding process to primary grinding device, to obtain primary grinding material；(3-2) will be described Primary grinding material supplies and carries out a stages of magnetic separation process to a stages of magnetic separation device, to obtain one section of sulfur-bearing metal iron powder and described Mine tailing；(3-3) described one section of sulfur-bearing metal iron powder is supplied and carry out secondary grinding process to secondary grinding device, to obtain Secondary grinding material；(3-4) described secondary grinding material is supplied and carry out two stages of magnetic separation process to two-stage nitration concentration equipment, to obtain Described sulfur-bearing metal iron powder and described mine tailing.Thus, the monomer of microwave pretreatment pelletizing can be made fully to dissociate, thus will wherein Sulfur-bearing metal iron powder fully select, and then be conducive to the abundant recovery of ferrum element and element sulphur.

In some embodiments of the invention, in step (3-1), in described primary grinding material, particle diameter is not higher than 0.074mm accounts for 70～80%.Thus, it is possible to improve the response rate of ferrum element and element sulphur further.

In some embodiments of the invention, in step (3-2), the magnetic field intensity that a described stages of magnetic separation is processed is 1600 ～1800oe.Thus, it is possible to improve the response rate of ferrum element and element sulphur further.

In some embodiments of the invention, in step (3-3), in described secondary grinding material, particle diameter is not higher than 0.074mm accounts for 80～95%.Thus, it is possible to improve the response rate of ferrum element and element sulphur further.

In some embodiments of the invention, in step (3-4), the magnetic field intensity that described two stages of magnetic separation are processed is 800 ～1200oe.Thus, it is possible to improve the response rate of ferrum element and element sulphur further.

In some embodiments of the invention, in step (4), the consumption of described ph regulator keeps containing containing sulfur metal The ph of the ore pulp of iron powder, collecting agent and foaming agent is 5～6.Thus, it is possible to improve the recovery of ferrum element and element sulphur further Rate.

In some embodiments of the invention, in step (4), based on described sulfur-bearing metal iron powder per ton, described collecting The consumption of agent is 200～250g, and the consumption of described foaming agent is 20～50g.Thus, it is possible to improve ferrum element and sulfur unit further The response rate of element.

In some embodiments of the invention, in step (4), described ph regulator be in sulphuric acid, hydrochloric acid extremely Few one kind.Thus, it is possible to improve the response rate of ferrum element and element sulphur further.

In some embodiments of the invention, in step (4), described collecting agent is selected from Isobutylxanthic acid, dialkyl Dithiophosphatess, at least one in dialkyldithiocarbamates salt.Thus, it is possible to improve ferrum element and sulfur further The response rate of element.

In some embodiments of the invention, in step (4), described foaming agent is different selected from 2# oil, 4# oil and methyl At least one in butyl carbinol.Thus, it is possible to improve the response rate of ferrum element and element sulphur further.

The additional aspect of the present invention and advantage will be set forth in part in the description, and partly will become from the following description Obtain substantially, or recognized by the practice of the present invention.

Brief description

The above-mentioned and/or additional aspect of the present invention and advantage will become from reference to the description to embodiment for the accompanying drawings below Substantially and easy to understand, wherein:

Fig. 1 is the system structure diagram preparing low-sulfur iron powder according to an embodiment of the invention；

Fig. 2 is the system structure diagram preparing low-sulfur iron powder according to further embodiment of the present invention；

Fig. 3 is the method flow schematic diagram preparing low-sulfur iron powder according to an embodiment of the invention；

Fig. 4 is the method flow schematic diagram preparing low-sulfur iron powder according to further embodiment of the present invention；

Fig. 5 is the system structure diagram preparing low-sulfur iron powder according to another embodiment of the present invention.

Specific embodiment

Embodiments of the invention are described below in detail, the example of described embodiment is shown in the drawings, wherein from start to finish The element that same or similar label represents same or similar element or has same or like function.Below with reference to attached The embodiment of figure description is exemplary it is intended to be used for explaining the present invention, and is not considered as limiting the invention.

Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or hint relative importance Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or Implicitly include at least one this feature.In describing the invention, " multiple " are meant that at least two, such as two, three Individual etc., unless otherwise expressly limited specifically.

In the present invention, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " fixation " etc. Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects Connect or electrically connect；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary, can be in two elements The connection in portion or the interaction relationship of two elements, limit unless otherwise clear and definite.For those of ordinary skill in the art For, above-mentioned term concrete meaning in the present invention can be understood as the case may be.

In one aspect of the invention, the present invention proposes a kind of system preparing low-sulfur iron powder.Reality according to the present invention Apply example, with reference to Fig. 1, this system includes: microwave pretreatment device 100, breaker 200, ore grinding-magnetic separating unit 300 and flotation Device 400.

According to embodiments of the invention, microwave pretreatment device 100 has metallized pellet entrance 101 and microwave pretreatment Pelletizing outlet 102, and be suitable to for metallized pellet to carry out pretreatment, to obtain microwave pretreatment pelletizing.Inventor finds, adopts With microwave pretreatment device, metallized pellet is carried out with pretreatment, one side microwave irradiation metallized pellet can make metallization ball The temperature of group raises, and because the ferrum in metallized pellet is different with the thermal conductivity of other gangue minerals, leads to produce because of thermograde The thermal shock damage that raw thermal stress causes is also different, so that metallized pellet can realize selective crushing；On the other hand, The energy of microwave radiation can make the fe s key in containing sulfur minerals obtain energy, so that the reactivity of containing sulfur minerals strengthens, Be conducive to the carrying out of follow-up flotation flowsheet, carry out pretreatment from there through supplying metallized pellet to microwave pretreatment device Both having promoted the monomer dissociation of mineral, thus improving follow-up grinding efficiency, having improve the floatability of containing sulfur minerals so that follow-up again Do not require the use of activator in flotation flowsheet, reduce cost.

According to one embodiment of present invention, the source of metallized pellet is not particularly restricted, those skilled in the art Can be selected according to actual needs.According to a specific embodiment of the present invention, metallized pellet can be to adopt roasting Device processes bauxite, high-phosphor oolitic hematite, red mud, copper ashes, at least one in nickel slag and lead and zinc smelting dreg obtain.By This, can significantly improve resource utilization.Specifically, calciner can be tunnel cave, rotary kiln, shaft furnace or rotary hearth furnace.

According to still another embodiment of the invention, the degree of metalization of metallized pellet is not particularly restricted, this area skill Art personnel can be selected according to actual needs.According to a specific embodiment of the present invention, the metallization of metallized pellet Rate can be 80～95%.Thus, it is possible to significantly improve the grade of gained low-sulfur iron powder.

According to still another embodiment of the invention, in metallized pellet, full weight of iron fraction can be 25～60%, metal Weight of iron fraction can be 20～57%, and quality of alumina fraction can be 15～25%, and siliconoxide mass fraction can be 13 ～27%, calcium oxide mass fraction can be 5～15%, and sulfur nutrient can be 2～5%.Thus, it is possible to widen iron content The abundant recycling (Iron grade and the response rate are up to 90%) of ferrum element and element sulphur is realized while resource makes full use of.

According to still another embodiment of the invention, preprocessing process conditional is not particularly restricted, people in the art Member can be selected according to actual needs.According to a specific embodiment of the present invention, in preprocessing process, microwave frequency can Think 300mhz～300ghz, microwave power can be 300～700w, process time can be 10～30min.Invention Crinis Carbonisatus Existing, when microwave frequency, microwave power and process time three too low when, cannot be to handled metallization in preprocessing process The effect that pelletizing plays selective crushing and containing sulfur minerals therein are played with activation；And when microwave frequency is too high, accordingly Wavelength shorter, the penetration capacity of microwave is stronger, leads to energy loss bigger；When microwave power is too high, lead to energy expenditure Larger, cause the wasting of resources；Between when treated long when, the thermal stress of iron mineral and gangue mineral in metallized pellet can be made There is no difference, thus selective crushing cannot be realized, and then affect follow-up ore grinding-magnetic separation effect.

According to embodiments of the invention, breaker 200 has microwave pretreatment pelletizing entrance 201 and broken material outlet 202, microwave pretreatment pelletizing entrance 201 and microwave pretreatment pelletizing outlet 102 is connected, and be suitable to will be pre- for microwave obtained above Process pelletizing and carry out break process, to obtain broken material.Inventor finds, by using breaker by microwave pretreatment ball Group carries out break process, and after crushing, the particle diameter of metallized pellet is less, such that it is able to significantly improve the effect of follow-up ore grinding-magnetic separation Rate.

According to one embodiment of present invention, the particle diameter of broken material is not particularly restricted, and those skilled in the art are permissible Selected according to actual needs.According to a specific embodiment of the present invention, the particle diameter of broken material can be not higher than 2mm. Thus, it is possible to significantly improve the efficiency of follow-up ore grinding-magnetic separation.

According to embodiments of the invention, ore grinding-magnetic separating unit 300 has broken material entrance 301, the outlet of sulfur-bearing metal iron powder 302 and mine tailing outlet 303, broken material entrance 301 and broken material outlet 202 is connected, and is suitable to for broken material to carry out ore grinding-magnetic separation Process, to obtain sulfur-bearing metal iron powder and mine tailing.Specifically, different according to the fineness of ore grinding, select different magnetic field intensities, The monomer that microwave pretreatment pelletizing can be made fully dissociates, thus sulfur-bearing metal iron powder therein is fully selected, is conducive to containing The recovery of iron resource and follow-up sulfur reduction are processed.

According to one embodiment of present invention, with reference to Fig. 2, ore grinding-magnetic separating unit 300 can include a section being sequentially connected Ore grinding device 31, a stages of magnetic separation device 32, secondary grinding device 33 and two-stage nitration concentration equipment 34.

According to a specific embodiment of the present invention, broken material enters 301 and is arranged on primary grinding device 31, and one section Primary grinding material outlet 311 is also provided with ore grinding device 31, and the broken material being suitable to obtain breaker carries out one Section ore grinding is processed, to obtain primary grinding material.Thus, it is possible in guarantee subsequent process ferrum element and element sulphur abundant recovery Using.

According to one embodiment of present invention, the particle diameter of primary grinding material is not particularly restricted, those skilled in the art Can be selected according to actual needs.According to a specific embodiment of the present invention, in primary grinding material, particle diameter is not higher than 0.074mm can account for 70～80%.Inventor find, if in primary grinding material particle diameter be not higher than 0.074mm accounting too low when, The monomer dissociation of mineral cannot be realized, and too high, cause energy dissipation, and mineral granularity is meticulous is unfavorable for a follow-up stages of magnetic separation Process.

According to another specific embodiment of the present invention, a stages of magnetic separation device 32 can be provided with primary grinding material entrance 321st, one section of sulfur-bearing metal iron powder outlet 322 and mine tailing outlet 303, primary grinding material entrance 321 exports 311 with primary grinding material It is connected, and the primary grinding material being suitable to obtain above-mentioned primary grinding device 31 carries out a stages of magnetic separation process, to obtain one section Sulfur-bearing metal iron powder and mine tailing.Thus, it is possible to be further ensured that the abundant recycling of ferrum element and element sulphur in subsequent process.

According to one embodiment of present invention, the condition that a stages of magnetic separation is processed is not particularly restricted, people in the art Member can be selected according to actual needs.The magnetic field intensity being processed according to a specific embodiment of the present invention, a stages of magnetic separation Can be 1600～1800oe.Inventor finds, the magnetic field intensity that a stages of magnetic separation is processed is too high to lead to gained concentrate grade relatively Low, and too low then cannot efficient recovery ferrum element.

According to another specific embodiment of the present invention, secondary grinding device 33 can be provided with one section of sulfur-bearing metallic iron Powder entrance 331 and secondary grinding material outlet 332, one section of sulfur-bearing metal iron powder entrance 331 and one section of sulfur-bearing metal iron powder outlet 322 It is connected, and be suitable to the one section of sulfur-bearing metal iron powder obtaining in a stages of magnetic separation device be carried out secondary grinding process, to obtain two Section ore grinding material.Thus, it is possible to be further ensured that the abundant recycling of ferrum element and element sulphur in subsequent process.

According to one embodiment of present invention, the particle diameter of secondary grinding material is not particularly restricted, those skilled in the art Can be selected according to actual needs.According to a specific embodiment of the present invention, in secondary grinding material, particle diameter is not higher than 0.074mm accounts for 80～95%.Inventor finds, if in secondary grinding material particle diameter be not higher than 0.074mm accounting too low when, no Method realizes the monomer dissociation of mineral, thus lead to follow-up gained low-sulfur iron powder grade relatively low, and too high, cause energy dissipation, And mineral granularity meticulous be unfavorable for follow-up two stages of magnetic separation process.

According to another specific embodiment of the present invention, sulfur-bearing metal iron powder outlet 302 and mine tailing outlet 303 can be arranged On two-stage nitration concentration equipment 34, and secondary grinding material entrance 341, secondary grinding material can be provided with two-stage nitration concentration equipment 34 Entrance 341 is connected with secondary grinding material outlet 332, and is suitable to carry out the secondary grinding material obtaining in above-mentioned secondary grinding device Two stages of magnetic separation are processed, to obtain sulfur-bearing metal iron powder and mine tailing.Thus, it is possible to be further ensured that in subsequent process ferrum element and The abundant recycling of element sulphur.

According to still another embodiment of the invention, the condition that two stages of magnetic separation are processed is not particularly restricted, art technology Personnel can be selected according to actual needs.According to a specific embodiment of the present invention, the magnetic field that two stages of magnetic separation are processed is strong Degree can be 800～1200oe.Inventor finds, the magnetic field intensity that two stages of magnetic separation are processed is too high to lead to gained concentrate grade relatively Low, and too low then cannot efficient recovery ferrum element；And inventor is had been surprisingly found that by many experiments, the mesh that a stages of magnetic separation is processed Be the ferrum element reclaiming as far as possible in metallized pellet, and the purpose that two stages of magnetic separation are processed is to obtain the higher essence of Iron grade Ore deposit, and exactly inventor recognizes that this point is passed through to feel free to try discovery, when the magnetic field intensity that two stages of magnetic separation are processed is less than one section During the magnetic field intensity that magnetic separation is processed, the waste of sulfur iron resource can be prevented effectively from, thus for realizing ferrum unit in follow-up floatation process The abundant recycling of element and element sulphur lays the foundation.

According to still a further embodiment, the particular type of primary grinding device 31 and secondary grinding device 33 is not It is particularly limited, those skilled in the art can be selected according to actual needs.According to a specific embodiment of the present invention, Primary grinding device 31 and secondary grinding device 33 can be separately rod mill or ball mill.Thus, it is possible to further Ensure the abundant recycling of ferrum element and element sulphur in subsequent process.

According to still another embodiment of the invention, the particular type of a stages of magnetic separation device 32 and two-stage nitration concentration equipment 34 is not It is particularly limited, those skilled in the art can be selected according to actual needs.According to a specific embodiment of the present invention, One stages of magnetic separation device 32 and two-stage nitration concentration equipment 34 can be separately magnetic separator or magnetic separation tube.Thus, it is possible to further Ensure the abundant recycling of ferrum element and element sulphur in subsequent process.

According to embodiments of the invention, flotation unit 400 has sulfur-bearing metal iron powder entrance 401, ph regulator entrance 402nd, collecting agent entrance 403, foaming agent entrance 404, low-sulfur iron powder outlet 405 and Iron sulfuret. outlet 406, sulfur-bearing metal iron powder Entrance 401 is connected with sulfur-bearing metal iron powder outlet 302, and is suitable to sulfur-bearing metal iron powder, ph regulator, collecting agent and foaming agent Carry out flotation process, to respectively obtain low-sulfur iron powder and Iron sulfuret..Inventor finds, by above-mentioned gained sulfur-bearing metal iron powder Carry out flotation process with ph regulator, collecting agent and foaming agent, after sulfur-bearing metal iron powder mix homogeneously in water, ph regulator Solution can be adjusted to suitable acid-base value, and collecting agent, due to its selective absorption, can adsorb on containing sulfur minerals surface, thus Change the surface activity of containing sulfur minerals, foaming agent can make containing sulfur minerals be brought out in the presence of bubble, thus realizing gold Belong to being sufficiently separated of ferrum and containing sulfur minerals, and then (sulfur content can be down to 0.1% not only can to obtain the relatively low metal iron powder of sulfur-bearing Left and right), and can fully reclaim the Sulphur ressource in sulfur-bearing metal iron powder.

According to one embodiment of present invention, the consumption of ph regulator is not particularly restricted, and those skilled in the art can To be selected according to actual needs.According to a specific embodiment of the present invention, the consumption of ph regulator is to keep containing containing The ph of the ore pulp of sulfur metal iron powder, collecting agent and foaming agent is 5～6.Inventor find, when the consumption of ph regulator make containing When the ph value of the ore pulp of sulfur-bearing metal iron powder, collecting agent and foaming agent is too high or too low, collecting agent therein all cannot effectively be inhaled It is attached to containing sulfur minerals surface to change the surface activity of containing sulfur minerals, thus being unfavorable for the flotation process of low-sulfur iron powder, Jin Erwu Method realizes the abundant recycling of ferrum element and element sulphur in iron-bearing mineral.

According to still a further embodiment, based on sulfur-bearing metal iron powder per ton, the consumption of collecting agent and foaming agent Consumption is not particularly restricted, and those skilled in the art can be selected according to actual needs.A tool according to the present invention Body embodiment, based on sulfur-bearing metal iron powder per ton, the consumption of collecting agent can be 200～250g, and the consumption of foaming agent can be 20～50g.Inventor finds, when the consumption of collecting agent is too high, can make the collecting therein when flotation is processed of low-sulfur iron powder Agent is not only adsorbed in containing sulfur minerals surface and also can be adsorbed in gangue mineral surface, thus cannot realize containing sulfur minerals from low-sulfur ferrum Separate in powder；And when the consumption of collecting agent is too low it is impossible to fully change the surface activity of containing sulfur minerals, impact flotation effect Really.When the consumption of foaming agent is too high it may appear that running mortise phenomenon, affect flotation effect；And when the consumption of foaming agent is too low, no Method realizes being sufficiently separated of metallic iron and containing sulfur minerals.

According to still another embodiment of the invention, the particular type of ph regulator is not particularly restricted, art technology Personnel can be selected according to actual needs.According to a specific embodiment of the present invention, ph regulator can be selected from sulfur At least one in acid and hydrochloric acid.Inventor finds, can be significantly better than other types using such ph regulator and ensure ferrum unit Element and the abundant recycling of element sulphur.

According to still another embodiment of the invention, the particular type of collecting agent is not particularly restricted, people in the art Member can be selected according to actual needs.According to a specific embodiment of the present invention, collecting agent can be selected from isobutyl group At least one in xanthate, dialkyl dithiophosphate and dialkyldithiocarbamates salt.Inventor finds, using this Class collecting agent can be significantly better than the abundant recycling that other types ensure ferrum element and element sulphur.

According to still another embodiment of the invention, foaming agent is not particularly restricted, and those skilled in the art can basis It is actually needed and selected.According to a specific embodiment of the present invention, foaming agent can be different selected from 2# oil, 4# oil and methyl At least one in butyl carbinol.Inventor finds, can be significantly better than other types using such foaming agent and ensure ferrum element Abundant recycling with element sulphur.

The according to embodiments of the present invention system preparing low-sulfur iron powder is passed through using microwave pretreatment device to metallization ball Group carries out pretreatment, and one side microwave irradiation metallized pellet can make the temperature of metallized pellet raise, due to the ball that metallizes Ferrum in group is different with the thermal conductivity of other gangue minerals, leads to the thermal shock damage that the thermal stress producing because of thermograde causes Also different, so that metallized pellet can realize selective crushing；On the other hand, the energy of microwave radiation can make sulfur-bearing ore deposit Fe s key in thing obtains energy, so that the reactivity of containing sulfur minerals strengthens, is conducive to the carrying out of follow-up flotation flowsheet, Carry out, to microwave pretreatment device, the monomer dissociation that pretreatment had both promoted mineral from there through supplying metallized pellet, from And improve follow-up grinding efficiency, improve the floatability of containing sulfur minerals so that not requiring the use of activator in follow-up flotation flowsheet again, Reduce cost, then successively microwave pretreatment pelletizing is carried out with broken and ore grinding-magnetic separation process so that microwave pretreatment ball Group's Minerals monomer fully dissociates, and such that it is able to fully select sulfur-bearing metal iron powder therein, is conducive to returning of iron-containing resource Receive and follow-up sulfur reduction processed, then gained sulfur-bearing metal iron powder, ph regulator, collecting agent and foaming agent are carried out flotation process, After sulfur-bearing metal iron powder mix homogeneously in water, ph regulator can adjust solution to suitable acid-base value, and collecting agent by In its selective absorption, can adsorb on containing sulfur minerals surface, thus changing the surface activity of containing sulfur minerals, foaming agent can make to contain Sulfur mineral is brought out in the presence of bubble, thus realizing being sufficiently separated of metallic iron and containing sulfur minerals, and then not only can Obtain the relatively low metal iron powder of sulfur-bearing, and can fully reclaim the Sulphur ressource in sulfur-bearing metal iron powder.Thus, using this system Metallized pellet is carried out with process and can obtain low-sulfur iron powder (sulfur content can be down to 0.1% about), improve the quality of product, from And widening abundant recycling (Iron grade and the response rate realizing ferrum element and element sulphur while iron-containing resource makes full use of Up to 90%).

As described above, the according to embodiments of the present invention system preparing low-sulfur iron powder can have the advantages that selected from following at least One of:

The according to embodiments of the present invention system preparing low-sulfur iron powder can be used for processing multiple iron-containing resources, range of application Extensively；

The according to embodiments of the present invention system preparing low-sulfur iron powder adopts microwave treatment metallized pellet, has both promoted ore deposit The monomer dissociation of thing, improves grinding efficiency, improves the floatability of containing sulfur minerals so that being not required in follow-up flotation flowsheet simultaneously Using activator, reduce cost；

The according to embodiments of the present invention system preparing low-sulfur iron powder utilizes rotary hearth furnace-mill ore magnetic selection flow process and flotation flowsheet In conjunction with effectively reducing the sulfur in metal iron powder, improve the quality of product；

Process is simple in the according to embodiments of the present invention system processing procedure preparing low-sulfur iron powder it is easy to operation it is easy to Large-scale production, has very high practical value.

In another aspect of the invention, the present invention proposes and a kind of processes gold using the above-mentioned system preparing low-sulfur iron powder The method belonging to pellet.According to embodiments of the invention, with reference to Fig. 3, the method includes:

S100: metallized pellet is supplied and carries out pretreatment to microwave pretreatment device

In this step, metallized pellet is supplied to microwave pretreatment device, carries out pretreatment, so that it is pre- to obtain microwave Process pelletizing.Inventor finds, using microwave pretreatment device, metallized pellet is carried out with pretreatment, one side microwave irradiation gold Belonging to pellet can make the temperature of metallized pellet raise, due to the thermal conductivity of the ferrum in metallized pellet and other gangue minerals Difference, leads to the thermal shock damage that the thermal stress producing because of thermograde causes also different, so that metallized pellet can be real Existing selective crushing；On the other hand, the energy of microwave radiation can make the fe s key in containing sulfur minerals obtain energy, so that The reactivity of containing sulfur minerals strengthens, and is conducive to the carrying out of follow-up flotation flowsheet, supplies to micro- from there through by metallized pellet Carrying out, in ripple pretreatment unit, the monomer dissociation that pretreatment had both promoted mineral, thus improving follow-up grinding efficiency, improve again The floatability of containing sulfur minerals, so that not requiring the use of activator in follow-up flotation flowsheet, reduces cost.

S200: microwave pretreatment pelletizing is supplied and carries out break process to breaker

In this step, microwave pretreatment pelletizing is supplied to breaker, carries out break process, to obtain broken material. Inventor finds, by microwave pretreatment pelletizing is carried out by break process using breaker, the grain of metallized pellet after crushing Footpath is less, such that it is able to significantly improve the efficiency of follow-up ore grinding-magnetic separation.

S300: broken material is supplied and carries out ore grinding-magnetic separation process to ore grinding-concentration equipment

In this step, broken material is supplied and carries out ore grinding-magnetic separation process to ore grinding-concentration equipment, to obtain sulfur-bearing Metal iron powder and mine tailing.Specifically, different according to the fineness of ore grinding, select different magnetic field intensities, microwave pretreatment can be made The monomer of pelletizing fully dissociates, thus sulfur-bearing metal iron powder therein is fully selected, be conducive to iron-containing resource recovery and after Continuous sulfur reduction is processed.

According to one embodiment of present invention, with reference to Fig. 4, ore grinding-magnetic separation processes and can carry out according to the following step:

S310: broken material is supplied and carries out primary grinding process to primary grinding device

In this step, broken material is supplied to primary grinding device, carries out primary grinding process, to obtain one section of mill Mineral aggregate.Thus, it is possible in guarantee subsequent process ferrum element and element sulphur abundant recycling.

S320: primary grinding material is supplied and carries out a stages of magnetic separation process to a stages of magnetic separation device

In this step, primary grinding material is supplied to a stages of magnetic separation device, carries out a stages of magnetic separation process, to obtain one Section sulfur-bearing metal iron powder and mine tailing.Thus, it is possible to be further ensured that the abundant recovery profit of ferrum element and element sulphur in subsequent process With.

S330: one section of sulfur-bearing metal iron powder is supplied and carries out secondary grinding process to secondary grinding device

In this step, one section of sulfur-bearing metal iron powder is supplied to secondary grinding device, carries out secondary grinding process, so that Obtain secondary grinding material.Thus, it is possible to be further ensured that the abundant recycling of ferrum element and element sulphur in subsequent process.

S340: secondary grinding material is supplied and carries out two stages of magnetic separation process to two-stage nitration concentration equipment

In this step, secondary grinding material is supplied to two-stage nitration concentration equipment, carries out two stages of magnetic separation process, to be contained Sulfur metal iron powder and mine tailing.Thus, it is possible to be further ensured that the abundant recycling of ferrum element and element sulphur in subsequent process.

According to still a further embodiment, the particular type of primary grinding device and secondary grinding device is not subject to spy Do not limit, those skilled in the art can be selected according to actual needs.According to a specific embodiment of the present invention, one section Ore grinding device 31 and secondary grinding device 33 can be separately rod mill or ball mill.Thus, it is possible to be further ensured that The abundant recycling of ferrum element and element sulphur in subsequent process.

According to still another embodiment of the invention, the particular type of a stages of magnetic separation device and two-stage nitration concentration equipment is not subject to spy Do not limit, those skilled in the art can be selected according to actual needs.According to a specific embodiment of the present invention, one section Concentration equipment 32 and two-stage nitration concentration equipment 34 can be separately magnetic separator or magnetic separation tube.Thus, it is possible to be further ensured that The abundant recycling of ferrum element and element sulphur in subsequent process.

S400: sulfur-bearing metal iron powder, ph regulator, collecting agent and foaming agent are supplied and carries out at flotation to flotation unit Reason

In this step, sulfur-bearing metal iron powder, ph regulator, collecting agent and foaming agent are supplied and is floated to flotation unit Choosing is processed, to respectively obtain low-sulfur iron powder and Iron sulfuret..Inventor finds, above-mentioned gained sulfur-bearing metal iron powder is adjusted with ph Whole dose, collecting agent and foaming agent carry out flotation process, and after sulfur-bearing metal iron powder mix homogeneously in water, ph regulator can will be molten Liquid adjusts to suitable acid-base value, and collecting agent, due to its selective absorption, can adsorb on containing sulfur minerals surface, thus change containing The surface activity of sulfur mineral, foaming agent can make containing sulfur minerals be brought out in the presence of bubble, thus realize metallic iron and Being sufficiently separated of containing sulfur minerals, and then the relatively low metal iron powder of sulfur-bearing (sulfur content can be down to 0.1% about) not only can be obtained, And can fully reclaim the Sulphur ressource in sulfur-bearing metal iron powder.

The according to embodiments of the present invention method preparing low-sulfur iron powder is passed through using microwave pretreatment device to metallization ball Group carries out pretreatment, and one side microwave irradiation metallized pellet can make the temperature of metallized pellet raise, due to the ball that metallizes Ferrum in group is different with the thermal conductivity of other gangue minerals, leads to the thermal shock damage that the thermal stress producing because of thermograde causes Also different, so that metallized pellet can realize selective crushing；On the other hand, the energy of microwave radiation can make sulfur-bearing ore deposit Fe s key in thing obtains energy, so that the reactivity of containing sulfur minerals strengthens, is conducive to the carrying out of follow-up flotation flowsheet, Carry out, to microwave pretreatment device, the monomer dissociation that pretreatment had both promoted mineral from there through supplying metallized pellet, from And improve follow-up grinding efficiency, improve the floatability of containing sulfur minerals so that not requiring the use of activator in follow-up flotation flowsheet again, Reduce cost, then successively microwave pretreatment pelletizing is carried out with broken and ore grinding-magnetic separation process so that microwave pretreatment ball Group's Minerals monomer fully dissociates, and such that it is able to fully select sulfur-bearing metal iron powder therein, is conducive to returning of iron-containing resource Receive and follow-up sulfur reduction processed, then gained sulfur-bearing metal iron powder, ph regulator, collecting agent and foaming agent are carried out flotation process, After sulfur-bearing metal iron powder mix homogeneously in water, ph regulator can adjust solution to suitable acid-base value, and collecting agent by In its selective absorption, can adsorb on containing sulfur minerals surface, thus changing the surface activity of containing sulfur minerals, foaming agent can make to contain Sulfur mineral is brought out in the presence of bubble, thus realizing being sufficiently separated of metallic iron and containing sulfur minerals, and then not only can Obtain the relatively low metal iron powder of sulfur-bearing, and can fully reclaim the Sulphur ressource in sulfur-bearing metal iron powder.Thus, using the method Metallized pellet is carried out with process and can obtain low-sulfur iron powder (sulfur content can be down to 0.1% about), improve the quality of product, from And widening abundant recycling (Iron grade and the response rate realizing ferrum element and element sulphur while iron-containing resource makes full use of Up to 90%).It should be noted that above-mentioned be equally applicable to for the feature and advantage prepared described by the system of low-sulfur iron powder This prepares the method for low-sulfur iron powder, and here is omitted.

Below with reference to specific embodiment, present invention is described, it should be noted that these embodiments are only to describe Property, and limit the present invention never in any form.

Embodiment 1

The consisting of of copper ashes metallized pellet: full weight of iron fraction is 25.91%, metallic iron mass fraction is 22.51%, Degree of metalization is 90.37%, al₂o₃Mass fraction is 20.11%, sio₂Mass fraction for 26.73%, cao mass fraction is 6.63%, s mass fraction is 2%.With reference to Fig. 5, concrete operation step is as follows:

(1) copper ashes metallized pellet is supplied and carry out pretreatment to microwave pretreatment device, obtain microwave pretreatment ball Group, wherein, in preprocessing process, microwave frequency is 2.0ghz, and microwave power is 500w, and process time is 20min；

(2) microwave pretreatment pelletizing is supplied and carry out break process to breaker, to obtain broken material, wherein, The particle diameter of broken material is not higher than 2mm；

(3) above-mentioned gained broken material is supplied and carry out primary grinding process to primary grinding device, obtain primary grinding Material；Then primary grinding material is supplied and carry out a stages of magnetic separation process to a stages of magnetic separation device, obtain one section of sulfur-bearing metal iron powder And mine tailing；Then one section of sulfur-bearing metal iron powder is supplied and carry out secondary grinding process to secondary grinding device, obtain two-stage nitration mill Mineral aggregate；Finally secondary grinding material is supplied and carries out two stages of magnetic separation process to two-stage nitration concentration equipment, obtain sulfur-bearing metal iron powder and Mine tailing, wherein, primary grinding device and secondary grinding device are four rod mills of three rollers, a stages of magnetic separation device and two stages of magnetic separation Device is magnetic separation tube, the primary grinding time be 20min, in primary grinding material particle diameter be not higher than 0.074mm account for 74.81%, The magnetic field intensity that one stages of magnetic separation is processed is 1800oe；The secondary grinding time is 20min, and in secondary grinding material, particle diameter is not higher than 0.074mm accounts for 80.73%, and the magnetic field intensity that a stages of magnetic separation is processed is 1200oe, the Iron grade of sulfur-bearing metal iron powder of gained and The response rate is 90% about, wherein sulfur-bearing 3wt% about, relict element is few with objectionable impurities content.

(4) ph regulator sulphuric acid, collecting agent Isobutylxanthic acid are successively added in above-mentioned obtained sulfur-bearing metal iron powder Carry out flotation with foaming agent 2# oil, wherein, it is 5～6 that sulfuric acid dosage will keep the ph value of ore pulp, the use of collecting agent Isobutylxanthic acid Measure as 200g/t, the consumption of 2# oil is 20g/t, through flotation gained low-sulfur iron powder Iron grade more than 90%, sulfur-bearing 0.08wt%, relict element is few with objectionable impurities content.

Embodiment 2

The consisting of of red mud metallized pellet: full weight of iron fraction is 28.22%, metallic iron mass fraction is 25.75%, Degree of metalization is 91.26%, al₂o₃Mass fraction is 20.71%, sio₂Mass fraction for 26.34%, cao mass fraction is 7.45%, s mass fraction is 3%.With reference to Fig. 5, concrete operation step is as follows:

(1) red mud metallized pellet is supplied and carry out pretreatment to microwave pretreatment device, obtain microwave pretreatment ball Group, wherein, in preprocessing process, microwave frequency is 2.5ghz, and microwave power is 500w, and process time is 20min；

(3) above-mentioned gained broken material is supplied and carry out primary grinding process to primary grinding device, obtain primary grinding Material；Then primary grinding material is supplied and carry out a stages of magnetic separation process to a stages of magnetic separation device, obtain one section of sulfur-bearing metal iron powder And mine tailing；Then one section of sulfur-bearing metal iron powder is supplied and carry out secondary grinding process to secondary grinding device, obtain two-stage nitration mill Mineral aggregate；Finally secondary grinding material is supplied and carries out two stages of magnetic separation process to two-stage nitration concentration equipment, obtain sulfur-bearing metal iron powder and Mine tailing, wherein, primary grinding device and secondary grinding device are four rod mills of three rollers, a stages of magnetic separation device and two stages of magnetic separation Device is magnetic separation tube, the primary grinding time be 20min, in primary grinding material particle diameter be not higher than 0.074mm account for 75.72%, The magnetic field intensity that one stages of magnetic separation is processed is 1800oe；The secondary grinding time is 20min, and in secondary grinding material, particle diameter is not higher than 0.074mm accounts for 81.58%, and the magnetic field intensity that a stages of magnetic separation is processed is 1200oe, the Iron grade of sulfur-bearing metal iron powder of gained and The response rate is 90% about, wherein sulfur-bearing 4wt% about, relict element is few with objectionable impurities content.

(4) ph regulator sulphuric acid, collecting agent Isobutylxanthic acid are successively added in above-mentioned obtained sulfur-bearing metal iron powder Carry out flotation with foaming agent 2# oil, wherein, it is 5～6 that sulfuric acid dosage will keep the ph value of ore pulp, the use of collecting agent Isobutylxanthic acid Measure as 230g/t, the consumption of 2# oil is 30g/t, through flotation gained low-sulfur iron powder Iron grade more than 90%, sulfur-bearing 0.09wt%, relict element is few with objectionable impurities content.

Embodiment 3

The consisting of of zinc leaching residue metallized pellet: full weight of iron fraction is 26.32%, metallic iron mass fraction is 23.76%, degree of metalization is 90.26%, al₂o₃Mass fraction is 20.52%, sio₂Mass fraction is 25.20%, cao mass Fraction is 7.08%, s mass fraction is 2.5%.With reference to Fig. 5, concrete operation step is as follows:

(1) zinc leaching residue metallized pellet is supplied and carry out pretreatment to microwave pretreatment device, obtain microwave and locate in advance Reason pelletizing, wherein, in preprocessing process, microwave frequency is 3.0ghz, and microwave power is 500w, and process time is 20min；

(3) above-mentioned gained broken material is supplied and carry out primary grinding process to primary grinding device, obtain primary grinding Material；Then primary grinding material is supplied and carry out a stages of magnetic separation process to a stages of magnetic separation device, obtain one section of sulfur-bearing metal iron powder And mine tailing；Then one section of sulfur-bearing metal iron powder is supplied and carry out secondary grinding process to secondary grinding device, obtain two-stage nitration mill Mineral aggregate；Finally secondary grinding material is supplied and carries out two stages of magnetic separation process to two-stage nitration concentration equipment, obtain sulfur-bearing metal iron powder and Mine tailing, wherein, primary grinding device and secondary grinding device are four rod mills of three rollers, a stages of magnetic separation device and two stages of magnetic separation Device is magnetic separation tube, the primary grinding time be 20min, in primary grinding material particle diameter be not higher than 0.074mm account for 75.10%, The magnetic field intensity that one stages of magnetic separation is processed is 1800oe；The secondary grinding time is 20min, and in secondary grinding material, particle diameter is not higher than 0.074mm accounts for 81.26%, and the magnetic field intensity that a stages of magnetic separation is processed is 1200oe, the Iron grade of sulfur-bearing metal iron powder of gained and The response rate is 90% about, wherein sulfur-bearing 3.5wt% about, relict element is few with objectionable impurities content.

(4) ph regulator sulphuric acid, collecting agent Isobutylxanthic acid are successively added in above-mentioned obtained sulfur-bearing metal iron powder Carry out flotation with foaming agent 2# oil, wherein, it is 5～6 that sulfuric acid dosage will keep the ph value of ore pulp, the use of collecting agent Isobutylxanthic acid Measure as 210g/t, the consumption of 2# oil is 30g/t, through flotation gained low-sulfur iron powder Iron grade more than 90%, sulfur-bearing 0.08wt%, relict element is few with objectionable impurities content.

In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or the spy describing with reference to this embodiment or example Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be in office Combine in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area The feature of the different embodiments described in this specification or example and different embodiment or example can be tied by art personnel Close and combine.

Although embodiments of the invention have been shown and described above it is to be understood that above-described embodiment is example Property it is impossible to be interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned Embodiment is changed, changes, replacing and modification.

Claims

1. a kind of system preparing low-sulfur iron powder is it is characterised in that include:

Microwave pretreatment device, described microwave pretreatment device has metallized pellet entrance and the outlet of microwave pretreatment pelletizing；

Breaker, described breaker has microwave pretreatment pelletizing entrance and broken material outlet, described microwave pretreatment ball Group's entrance is connected with the outlet of described microwave pretreatment pelletizing；

Flotation unit, described flotation unit has sulfur-bearing metal iron powder entrance, ph regulator entrance, collecting agent entrance, foaming agent Entrance, the outlet of low-sulfur iron powder and Iron sulfuret. outlet, described sulfur-bearing metal iron powder entrance exports phase with described sulfur-bearing metal iron powder Even.

2. system according to claim 1 is it is characterised in that described ore grinding-magnetic separating unit includes a section being sequentially connected Ore grinding device, a stages of magnetic separation device, secondary grinding device and two-stage nitration concentration equipment.

3. system according to claim 2 is it is characterised in that described primary grinding device and secondary grinding device are only respectively It is on the spot rod mill or ball mill.

4. system according to claim 2 is it is characterised in that a described stages of magnetic separation device and two-stage nitration concentration equipment are only respectively It is on the spot magnetic separator or magnetic separation tube.

5. a kind of using the system any one of claim 1-4 prepare low-sulfur iron powder method it is characterised in that bag Include:

(1) metallized pellet is supplied and carry out pretreatment to described microwave pretreatment device, to obtain microwave pretreatment ball Group；

(2) described microwave pretreatment pelletizing is supplied and carry out break process to described breaker, to obtain broken material；

(3) described broken material is supplied and carry out ore grinding-magnetic separation process to described ore grinding-concentration equipment, to obtain sulfur-bearing gold Belong to iron powder and mine tailing；

(4) described sulfur-bearing metal iron powder, ph regulator, collecting agent and foaming agent are supplied and carry out flotation to described flotation unit Process, to respectively obtain low-sulfur iron powder and Iron sulfuret..

6. method according to claim 5 is it is characterised in that in step (1), described metallized pellet is to adopt roasting Device processes bauxite, high-phosphor oolitic hematite, red mud, copper ashes, at least one in nickel slag and lead and zinc smelting dreg obtain,

Optional, described calciner is tunnel cave, rotary kiln, shaft furnace or rotary hearth furnace；

Optional, the degree of metalization of described metallized pellet is 80～95%；

Optional, in described metallized pellet, full weight of iron fraction is 25～60%, and metallic iron mass fraction is 20～57%, oxygen Changing aluminum mass fraction is 15～25%, and siliconoxide mass fraction is 13～27%, and calcium oxide mass fraction is 5～15%, sulfur matter Amount fraction is 2～5%.

7. the method according to claim 5 or 6 is it is characterised in that in step (1), microwave in described preprocessing process Frequency is 300mhz～300ghz, and microwave power is 300～700w, and process time is 10～30min.

8. method according to claim 7 is it is characterised in that in step (2), the particle diameter of described broken material is not higher than 2mm.

9. method according to claim 5 is it is characterised in that step (3) is carried out according to the following step:

(3-1) described broken material is supplied and carry out primary grinding process to primary grinding device, to obtain primary grinding material；

(3-2) described primary grinding material is supplied and carry out a stages of magnetic separation process to a stages of magnetic separation device, obtain one section to contain Sulfur metal iron powder and described mine tailing；

(3-3) described one section of sulfur-bearing metal iron powder is supplied and carry out secondary grinding process to secondary grinding device, to obtain Secondary grinding material；

(3-4) described secondary grinding material is supplied and carry out two stages of magnetic separation process to two-stage nitration concentration equipment, to contain described in obtaining Sulfur metal iron powder and described mine tailing,

Optional, in step (3-1), in described primary grinding material, particle diameter not higher than 0.074mm's accounts for 70～80%；

Optional, in step (3-2), the magnetic field intensity that a described stages of magnetic separation is processed is 1600～1800oe；

Optional, in step (3-3), in described secondary grinding material, particle diameter not higher than 0.074mm's accounts for 80～95%；

Optional, in step (3-4), the magnetic field intensity that described two stages of magnetic separation are processed is 800～1200oe.

10. method according to claim 5 is it is characterised in that in step (4), the consumption of described ph regulator keeps The ph of the ore pulp containing sulfur-bearing metal iron powder, collecting agent and foaming agent is 5～6；

Optional, based on described sulfur-bearing metal iron powder per ton, the consumption of described collecting agent is 200～250g, described foaming agent Consumption is 20～50g；

Optional, described ph regulator is at least one in sulphuric acid, hydrochloric acid；

Optional, described collecting agent is selected from Isobutylxanthic acid, dialkyl dithiophosphate and dihydrocarbyl dithiophosphate amino first At least one in hydrochlorate；

Optional, described foaming agent is at least one in 2# oil, 4# oil and methyl isobutyl carbinol.