WO2011103803A1 - 用于粉煤灰除铁的立环磁选机及其磁选除铁方法 - Google Patents

用于粉煤灰除铁的立环磁选机及其磁选除铁方法 Download PDF

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Publication number
WO2011103803A1
WO2011103803A1 PCT/CN2011/071207 CN2011071207W WO2011103803A1 WO 2011103803 A1 WO2011103803 A1 WO 2011103803A1 CN 2011071207 W CN2011071207 W CN 2011071207W WO 2011103803 A1 WO2011103803 A1 WO 2011103803A1
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WIPO (PCT)
Prior art keywords
magnetic separator
vertical ring
slurry
iron yoke
iron
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PCT/CN2011/071207
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English (en)
French (fr)
Inventor
韩建国
郭昭华
张文辉
魏存弟
王永旺
徐少南
吕飒
董宏
池君洲
张建民
南清安
Original Assignee
中国神华能源股份有限公司
神华准格尔能源有限责任公司
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Priority claimed from CN201010112520A external-priority patent/CN101786041A/zh
Priority claimed from CN201010161869A external-priority patent/CN101869870A/zh
Application filed by 中国神华能源股份有限公司, 神华准格尔能源有限责任公司 filed Critical 中国神华能源股份有限公司
Priority to KR1020127024559A priority Critical patent/KR101317071B1/ko
Priority to CA2790147A priority patent/CA2790147C/en
Priority to DE112011100634.9T priority patent/DE112011100634B4/de
Priority to AU2011220220A priority patent/AU2011220220B2/en
Priority to RU2012135119/03A priority patent/RU2502563C1/ru
Priority to JP2012554208A priority patent/JP5346410B2/ja
Priority to US13/579,306 priority patent/US8505735B2/en
Publication of WO2011103803A1 publication Critical patent/WO2011103803A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/025—High gradient magnetic separators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/025—High gradient magnetic separators
    • B03C1/031—Component parts; Auxiliary operations
    • B03C1/033—Component parts; Auxiliary operations characterised by the magnetic circuit
    • B03C1/0335—Component parts; Auxiliary operations characterised by the magnetic circuit using coils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/025—High gradient magnetic separators
    • B03C1/029—High gradient magnetic separators with circulating matrix or matrix elements
    • B03C1/03—High gradient magnetic separators with circulating matrix or matrix elements rotating, e.g. of the carousel type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/025—High gradient magnetic separators
    • B03C1/031—Component parts; Auxiliary operations
    • B03C1/032—Matrix cleaning systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/025—High gradient magnetic separators
    • B03C1/031—Component parts; Auxiliary operations
    • B03C1/033—Component parts; Auxiliary operations characterised by the magnetic circuit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/025—High gradient magnetic separators
    • B03C1/031—Component parts; Auxiliary operations
    • B03C1/033—Component parts; Auxiliary operations characterised by the magnetic circuit
    • B03C1/034—Component parts; Auxiliary operations characterised by the magnetic circuit characterised by the matrix elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/18—Magnetic separation whereby the particles are suspended in a liquid

Definitions

  • the present invention relates to a magnetic separation apparatus and method, and more particularly to a vertical ring magnetic separator for removing iron from fly ash and a magnetic separation method thereof.
  • Fly ash is waste discharged from coal-fired power plants. The discharge of fly ash not only encroaches on a large amount of land, but also seriously pollutes the environment. How to treat and utilize fly ash becomes a very important issue. Fly ash contains a variety of components that can be utilized, such as alumina, silica, etc. If these useful components are extracted, efficient and comprehensive utilization of fly ash can be achieved.
  • fly ash is directly subjected to magnetic separation by a strong magnetic separator. But in the case of low iron impurities in fly ash
  • the purpose of using the vertical ring magnetic separator is mainly to select iron in weak magnetic iron ore.
  • the magnetic medium of the existing vertical ring magnetic separator is a round bar stainless steel medium, and the spacing between the round bar stainless steel media is large, so that the iron ore does not block the dielectric rod during the magnetic separation process.
  • excessive media spacing will cause particles with fine particle size and relatively weak magnetic properties in the fly ash to pass through the medium without being adsorbed by the medium, thereby reducing the magnetic separation. effect.
  • the vertical ring magnetic separator for removing fly ash from coal of the invention comprises: a rotating ring, an inductive medium, an upper iron yoke, a lower iron yoke, a field wire, a feed port, a tailing hopper and a flushing device, and a feed port
  • the tailings bucket is used for discharging the non-magnetic particles after the iron removal
  • the upper iron yoke and the lower iron yoke are respectively disposed in the ring at the lower part of the rotating ring and on the outer sides of the ring.
  • the flushing device is located above the rotating ring, and the sensing medium is installed in the rotating ring, and the exciting wire is disposed around the upper iron yoke and the lower iron yoke, so that the upper iron yoke and the lower iron yoke become a pair of magnetic poles for generating a vertical magnetic field.
  • the sensing medium is a multi-layer steel mesh, each steel mesh is composed of a silk stem, and the edge of the silk stem has a sharp edge.
  • the upper iron yoke and the lower iron yoke are integrally formed and surround the ring disposed on the lower portion of the rotating ring and the outer sides of the ring in a plane perpendicular to the rotating ring.
  • the vertical ring magnetic separator further comprises a pressure equalizing water jacket disposed around the excitation coil.
  • the steel mesh is made of lCr 17.
  • the excitation wire ⁇ is a double glass fiber lacquered aluminum flat wire electromagnetic wire ⁇ .
  • the mesh layer has a dielectric layer spacing of 2-5 mm. Further preferably, the mesh layer has a dielectric layer spacing of 3 mm.
  • the thickness of the steel mesh is 0.8-1.5 mm, and the mesh size is 3 mm x 8 mm.
  • the steel mesh has a thickness of 1 mm, a mesh size of 5 mm x 10 mm, and a wire stem width of 1.6 mm.
  • the vertical ring magnetic separator further includes a pulsation mechanism connected to the tail hopper through a rubber tympanic membrane.
  • an inductive medium is mounted around the entire circumference.
  • the present invention also provides a method for magnetically removing iron by fly ash using the above-mentioned vertical ring magnetic separator, the method comprising: a. disposing the fly ash into a slurry having a predetermined solid content; b. using the vertical ring Magnetic separator for magnetic separation of the slurry; c. detecting iron content of the magnetic slurry after the magnetic separation; When the iron content in the slurry is lower than or equal to the predetermined content, the slurry is discharged; when the iron content in the slurry is higher than the predetermined content, returning to step b, the slurry is again magnetically selected by the vertical ring magnetic separator .
  • the magnetic field strength of the vertical ring magnetic separator is 15,000 gauss or more.
  • the field strength of the vertical ring magnetic separator is 15,000 Gs to 2,000,000 Gs.
  • the method comprises: e. Pressing the discharged slurry into a filter cake.
  • the fly ash is configured as a slurry having a solids content of from 20% by weight to 40% by weight.
  • the discharged slurry is subjected to pressure filtration through a basket filter press, and a filter cake having a solid content of 60 wt% to 80 wt% is formed by pressure filtration.
  • iron impurities are more thoroughly removed in the case where the iron impurity content in the fly ash is small, and the iron removal efficiency is improved by more than 20% compared with the existing fly ash iron removal method.
  • the pressure of removing iron in the subsequent process solution is greatly alleviated, thereby reducing the production cost and improving the production efficiency.
  • FIG. 1 is a schematic structural view of a vertical ring magnetic separator for removing fly ash from the present invention
  • Figure 3 (c) is an enlarged schematic view of the characteristic line in Figure 3 (a);
  • the vertical ring magnetic separator for fly ash removing iron of the present invention comprises: a rotating ring 101, an inductive medium 102, an upper iron yoke 103, a lower iron yoke 104, an exciting wire 105, and a feed port 106.
  • the tailings bucket 107 further includes a pulsation mechanism 108 and a flushing device 109.
  • the swivel 101 is a circular carrier carrying an inductive medium 102.
  • the rotating ring 101 drives the sensing medium 102 and the material adsorbed by the sensing medium 102 to complete the material sorting.
  • the swivel 101 can be made of any suitable material, such as carbon steel or the like.
  • a motor or other drive can power the swivel 101 to enable the swivel 101 to rotate at a set speed.
  • the swivel 101 rotates the swivel rotation speed for optimum handling.
  • a lower rotation speed for example, 3 rpm
  • Driving the swivel 101 at a lower rotational speed also reduces the incorporation of non-magnetic minerals (such as fly ash) into the concentrate, which increases the concentrate yield.
  • the upper iron yoke 103 and the lower iron yoke 104 are disposed in the ring at the lower portion of the swivel 101 and on the outer sides of the ring, functioning as magnetic poles.
  • the upper iron yoke 103 and the lower iron yoke 104 are formed integrally around the ring disposed on the lower portion of the rotating ring 101 in the plane perpendicular to the rotating ring 101, on both outer sides of the ring.
  • the sensing medium 102 is mounted in the swivel 101, preferably, in the swivel 101, around the entire circumference, the sensing medium 102 is mounted. Since the exciting wire ⁇ 105 is disposed around the upper iron yoke and the lower iron yoke, the magnetic field generated by the exciting wire ⁇ 105 causes the upper iron yoke 103 and the lower iron yoke 104 to form a pair of magnetic poles which generate a magnetic field in the vertical direction.
  • the upper iron yoke 103 and the lower iron yoke 104 are disposed on the inner and outer sides below the swivel 101 to rotate the swivel 101 between the magnetic poles. When the swivel 101 is rotated, the inductive medium 102 in the swivel 101 is magnetized by the pair of poles formed by the upper iron yoke 103 and the lower iron yoke 104 to effect iron removal.
  • the sensing medium 102 is a multi-layer steel mesh.
  • the steel mesh is made of stainless steel, preferably made of 1G17.
  • Each layer of steel mesh is made of stainless steel wire stems and the mesh is diamond shaped. The edge of the stem has a ribbed sharp corner.
  • the edge of the steel mesh as the sensing medium 102 is angular, the magnetic field at the tip end of the medium is stronger, resulting in a better magnetic separation effect.
  • the dielectric layer spacing of the steel mesh is 2-5 mm. More preferably, the dielectric layer spacing of the steel mesh is 3 mm.
  • the thickness of the steel mesh is 0.8-1.5 mm
  • the mesh size is 3 mm x 8 mm -8 mm x 15 mm
  • the width of the silk stalk is l-2 mm. Since the spacing between the sensing medium layers 102 is reduced, the fly ash particles can be directly contacted with the sensing medium 102, thereby avoiding The phenomenon that magnetic particles pass through the medium and cannot be removed occurs.
  • the excitation wire ⁇ 105 is a double glass fiber lacquered aluminum flat wire, and the double glass fiber lacquered aluminum flat wire is a solid conductor, which is greatly improved compared with the conventional hollow copper tube electromagnetic wire ⁇ .
  • the air ratio enhances the magnetic focusing effect, improves the magnetic field distribution, and reduces power consumption.
  • the excitation line ⁇ 105 current is continuously adjustable, so the magnetic field is also the magnetic field of continuously adjustable magnetic field strength.
  • the vertical ring magnetic separator for fly ash iron removal of the present invention further includes a pulsation mechanism 108 connected to the tailings hopper 107 via a rubber tympanic membrane 111.
  • the pulsating mechanism can be realized by an eccentric link mechanism. Since the pulsating mechanism 108 is connected to the tailings hopper 107 through the rubber tympanic membrane 111, the alternating force generated by the pulsating mechanism 108 pushes the rubber tympanic membrane 111 to reciprocate, so that the tailings bucket can be made. The slurry in 107 produces pulsations.
  • a flushing device 109 is located above the swivel 101 for rushing magnetic material into the concentrate hopper 113 using a stream of water.
  • the flushing device 109 can be any suitable flushing or spraying device, such as a showerhead, a water pipe, or the like.
  • Feed port 106 can be a hopper or feed tube.
  • the feed port 106 for inflow enters the upper iron yoke 103 with a small drop, thereby avoiding the phenomenon that the magnetic particles pass through the induction medium 102 due to gravity, thereby improving the effect of magnetic separation and impurity removal.
  • the vertical ring magnetic separator further comprises a cooling device 112 disposed around the excitation coil for lowering the operating temperature of the excitation coil, the cooling device being a pressure chamber water jacket.
  • the excitation wire ⁇ 105 When the vertical ring magnetic separator that generates a strong magnetic field works, the excitation wire ⁇ 105 generates a large amount of heat, which may cause the wire to be overheated and burned, which is the most serious hazard to the magnetic separator. How to better dissipate this heat and reduce the temperature of the coil as much as possible has always been a technical problem.
  • the invention adopts the pressure equalizing water jacket as the cooling device, avoids the disadvantages in the conventional cooling mode, and ensures the safe and stable operation of the vertical ring magnetic separator.
  • the pressure equalizing chamber water jacket is preferably made of a stainless steel material to be less prone to fouling. Since the pressure equalizing chamber is installed at the inlet and outlet of the water jacket, the pressure equalizing chamber ensures that the water flows through each layer of the water jacket and is filled in the sleeve, thereby preventing the local water passage from being short-circuited and affecting heat dissipation.
  • the water channel of each water jacket has a large cross-sectional area, which can completely avoid scale blockage, even if there is a blockage, Affect the normal flow of circulating water in the water jacket. Moreover, the water jacket is in close contact with the large area of the wire, and most of the heat generated by the wire can be taken away by the water flow.
  • the pressure equalizing water jacket has high heat dissipation efficiency, low winding temperature rise, and low excitation power of the equipment.
  • the rated excitation current is 40A
  • the excitation power of the magnetic separator using ordinary hollow copper tube heat dissipation is 35kw
  • the excitation power of the magnetic separator using the uniform pressure chamber water jacket is 21kw.
  • the fed slurry flows through the swivel 101 along the gap of the upper iron yoke 103. Since the inductive medium 102 in the swivel 101 is magnetized in the background magnetic field, a gradient pole is formed on the surface of the inductive medium 102. High magnetic field. The magnetic particles in the slurry are attracted to the surface of the sensing medium 102 by the extremely high magnetic field, rotate with the rotating ring 101, and are brought to the non-magnetic field region at the top of the rotating ring 101, and then flushed by the flushing device 109 at the top. The magnetic material is washed into the concentrate bucket. The non-magnetic particles flow into the tailing hopper 107 along the gap of the lower iron yoke 104, and are discharged from the tailings port of the tailings hopper 107.
  • the surface area of the medium of the same quality is increased by more than 5 times, so the magnetic adsorption capacity is greatly increased, the probability of adsorption of the magnetic substance is greatly increased, and the magnetic field strength and gradient induced at the corners of the steel sheet mesh are increased. It is also much better than the rod medium.
  • the magnetic field distribution pattern after applying the steel mesh to the dielectric layer is as shown in Fig. 3 (a).
  • the small parallelogram of each column represents a cross section of a layer of dielectric mesh.
  • the figure simulates the magnetic field media of a five-layer mesh.
  • the cross section of the mesh formed by the stem is a parallelogram.
  • a characteristic line L is formed on the parallelogram
  • Fig. 3 (b) shows the simulated calculation of the induced field strength with the characteristic line from point a to point b. (Refer to Figure 3 (c)) for the variation of field strength. It can be seen that the tip has the highest induced field strength and can reach 22000 GS, or 2.2T.
  • Ansoft Maxwell 10 is an electromagnetic analysis software released by Ansoft. It is based on the maxwell equation for finite element analysis and is a powerful electromagnetic field simulation tool. It is mainly used to analyze two-dimensional and three-dimensional electromagnetic components, such as motors, transformers, actuators and other electrical and electromechanical devices, which are used in automotive, military, aerospace and industrial applications.
  • the vertical ring magnetic separator provided by the present invention is used.
  • the method for magnetically removing iron by fly ash is as shown in FIG. 4, and preferably includes the following steps:
  • the fly ash is preferably pulverized to a predetermined particle size, for example, a particle size of less than 2 mm.
  • the fly ash is configured as a slurry of a predetermined concentration.
  • the fly ash is added with water to form a slurry having a solid content of 20 to 40 wt Q / ⁇ .
  • the slurry configured to a predetermined solid content is magnetically selected on a vertical ring magnetic separator.
  • the vertical ring magnetic separator has a field strength of 1.5 to 2 million Gs.
  • the iron content of the magnetically separated slurry is detected.
  • the iron ion content in the sample can be detected by sampling and drying the slurry.
  • various applicable chemical detection methods or equipment can be used.
  • the slurry is discharged; when the iron content in the slurry is higher than the predetermined content, returning to step 202 through the vertical ring magnetic separator
  • the slurry is subjected to repeated magnetic separation.
  • the predetermined content may be comprehensively considered according to the quality requirement of the product and the magnetic separation cost.
  • the predetermined content of the iron oxide is 0.8 wt%, that is, when the iron oxide content is detected to be less than or equal to 0.8 wt%, the slurry is release.
  • the discharged slurry is subjected to pressure filtration and subjected to pressure filtration to form a filter cake.
  • the pressure filtration can be achieved by a basket filter press, preferably after the filter press, a solids content of 60-80 wt Q / ⁇ filter cake is formed.
  • the background magnetic field strength of the vertical ring magnetic separator is 12000GS, the excitation current is 40A, the material of the steel mesh is lCrl7, the dielectric layer spacing of the steel mesh is 3mm, the thickness is lmm, the mesh size is 5mmxl0mm, the width of the wire stem is 1.6mm, and the angular direction is upward.
  • the mesh medium node field strength can reach 22000 GS, which is 20% higher than the traditional vertical rotary induction wet magnetic separator.
  • the background magnetic field strength of the vertical ring magnetic separator is 12000GS
  • the excitation current is 40A
  • the material of the steel mesh is lCrl7
  • the dielectric layer spacing of the steel mesh is 2mm
  • the thickness is lmm
  • the mesh size is 3mmx8mm
  • the width of the wire stem is lmm
  • the angular direction is upward.
  • the mesh medium node has a field strength of up to 20000Gs.
  • the background magnetic field strength of the vertical ring magnetic separator is 12000 GS
  • the excitation current is 50 A
  • the material of the steel mesh For lCrl7, the dielectric layer spacing of the steel mesh is 5mm, the thickness is 1.5mm, the mesh size is 5mmxl0mm, the width of the wire stem is 2mm, and the angular direction is upward.
  • the field strength of the mesh medium node can reach 22000Gs.
  • the fluidized bed fly ash as a raw material has the chemical composition shown in Table 1, and the unit is: wt%:
  • Example 4
  • the fluidized bed ash was added with water to prepare a slurry having a solid content of 33% by weight, and magnetic separation was performed by a vertical ring magnetic separator under a magnetic field of 17,500 Gs. After each magnetic separation, 10 g of the magnetically selected slurry was taken. After drying at 110 ° C, the content of ferric ion (TFe203 ) and ferric ion (FeO ) (wt%) was measured. After magnetic separation three times, the content of iron ions was lower than the predetermined value of 0.8 wt%, reaching 0.7. Wt%. The slurry was discharged, and the discharged slurry was pressure-filtered by a plate filter press to obtain a solid content of 67.5 wt Q / ⁇ filter cake. The chemical composition of the filter cake is shown in Table 2 (wt%):
  • the fluidized bed fly ash described in Table 1 is magnetically selected on a conventional magnetic separator.
  • the induction medium of the conventional magnetic separator is a round bar stainless steel medium, and the spacing between adjacent round bar stainless steel media is 20 mm. .
  • the magnetic separation was directly performed in a magnetic field of 1.75 million Gs produced by a round bar-shaped stainless steel medium. After five magnetic separations, the chemical composition (wt%) after dry magnetic separation was as shown in Table 3:
  • the fluidized bed ash was added with water to prepare a slurry having a solid content of 20%, and magnetic separation was performed by a vertical ring magnetic separator under a magnetic field of 15,000 Gs. After each magnetic separation, 10 g of the magnetically selected slurry was taken. After drying at 110 ° C, the content (wt%) of ferric ion (TFe203) and divalent iron ion (FeO) was measured, and after three times of magnetic separation, the content of iron ions was equal to a predetermined value of 0.8 wt%.
  • the slurry was discharged, and the discharged slurry was pressure-filtered by a plate filter press, and filtered to obtain a cake having a solid content of 75.0% by weight.
  • the chemical composition of the filter cake is shown in Table 4 (wt%):
  • the fluidized bed fly ash described in Table 1 is magnetically selected on a conventional magnetic separator.
  • the induction medium of the conventional magnetic separator is a round bar stainless steel medium, and the spacing between adjacent round bar stainless steel media is 25 mm. .
  • the magnetic separation was directly performed under the magnetic field strength of 15,000 Gs produced by the round bar stainless steel medium.
  • the chemical composition (wt%) after dry magnetic separation was as follows: It can be seen that the content of iron ions in the product is then 1.46 wt%, and the iron content is also significantly higher than that obtained by the magnetic separation method of the fly ash of the present invention.
  • the fluidized bed ash was added with water to prepare a slurry having a solid content of 20% by weight, and magnetic separation was performed by a vertical ring magnetic separator under a magnetic field of 20,000 Gs. After each magnetic separation, 10 g of the magnetically selected slurry was taken. After drying at 110 ° C, the content of ferric ion (TFe203 ) and divalent iron ion (FeO ) (wt%) was measured. After three times of magnetic separation, the content of iron ions was lower than a predetermined value of 0.8 wt% to 0.75. Wt%. Will The slurry is discharged, and the discharged slurry is pressure-filtered by a plate filter press, and the solid content is obtained by pressure filtration.
  • TFe203 ferric ion
  • FeO divalent iron ion

Description

用于粉煤灰除铁的立环磁选机及其磁选除铁方法 技术领域
本发明涉及一种磁选设备和方法， 尤其涉及一种用于粉煤灰除铁的 立环磁选机及其磁选除铁方法。 背景技术
粉煤灰是燃煤电厂排出的废弃物， 粉煤灰的排放不仅侵占大量土地， 而且严重污染环境， 如何处理和利用粉煤灰成为一个十分重要的问题。 粉煤灰中含有多种可以利用的组分， 如氧化铝、 氧化硅等， 如果将这些 有用成分提取出来， 可以实现对粉煤灰的高效综合利用。
但是， 在对粉煤灰有用成分的提取过程中， 灰中所含有的氧化铁的 存在会对提取物的纯度造成影响。 因此从粉煤灰中除铁， 对提高有用成 分的纯度， 提高粉煤灰综合利用率具有重要意义。
通常采用的从粉煤灰中磁选除铁的方法主要为干法除铁， 即， 将粉 煤灰直接通过强磁选机进行磁选。 但在粉煤灰中铁杂质含量少的情况下
(氧化铁含量 <5%时） ， 由于铁杂质与粉煤灰难以分离， 因此也难以彻底 除去铁杂质。 所以， 对于低铁含量的粉煤灰， 现有技术的除铁效果较差。
目前， 使用立环磁选机的目的主要是在弱磁性铁矿石中选铁， 最终 需要选出具有一定品位的铁矿石， 因此在结构和磁场强度设计上主要是 针对选铁而不是除铁。 现有立环式磁选机的磁性介质为圆棒形不锈钢介 质， 而且， 圆棒形不锈钢介质之间的间距较大， 以便使铁矿石在磁选过 程中不会堵塞介质棒。 但如果在粉煤灰磁选除铁过程中， 过大的介质间 距就会使粉煤灰中的粒度细小、 磁性相对较弱的颗粒透过介质而不被介 质吸附， 从而降低了磁选的效果。
在传统的选铁应用中， 采用从立环磁选机上部给料、 从立环磁选机 下部出料的结构。 但在粉煤灰除铁过程中， 由于铁矿物的磁性很弱， 如 果采取上给料的方式， 铁质矿物有可能在重力作用下透过介质而不被吸 附， 进一步降低了磁选除铁的效果。 因此， 有必要设计一种新型磁选设备， 以便克服上述缺陷。 发明内容
针对现有技术的缺陷， 本发明的目的是提供一种彻底去除粉煤灰中 铁质矿物的磁选设备和方法。
本发明用于粉煤灰除铁的立环磁选机包括： 转环、 感应介质、 上铁 轭、 下铁轭、 励磁线圏、 进料口、 尾矿斗和冲水装置， 进料口用于输入 待除铁的粉煤灰， 尾矿斗用于排出除铁后的非磁性颗粒， 所述上铁轭和 下铁轭分别设置在转环下部的环内、 环外两侧， 所述冲水装置位于转环 上方， 感应介质安装在转环中， 励磁线圏设置在上铁轭和下铁轭周围， 以使上铁轭和下铁轭成为一对产生垂直方向磁场的磁极， 其中， 所述感 应介质为多层钢板网， 每层钢板网由丝梗编成， 所述丝梗的边缘具有棱 状尖角。
优选地， 上铁轭、 下铁轭一体形成， 且在垂直于转环的平面内环绕 设置在转环下部的环内、 环外两侧。
优选地， 所述立环磁选机还包括设置在励磁线圏周围的均压腔水套。 优选地， 所述钢板网由 lCr 17制成。
优选地， 所述励磁线圏是双玻璃丝包漆包铝扁线电磁线圏。
优选地， 钢板网的介质层间距为 2-5mm。 进一步优选地， 钢板网的 介质层间距为 3mm。
优选地， 钢板网的厚度 0.8-1.5mm , 网格大小为 3mmx8mm
-8mm l5mm, 丝梗宽度 l-2mm。 进一步优选地， 钢板网的厚度 1mm, 网格大小为 5mmxl0mm, 丝梗宽度 1.6mm。
优选地， 所述立环磁选机还包括脉动机构， 所述脉动机构通过橡胶 鼓膜与尾矿斗相连。
优选地， 在转环中， 环绕整个圆周方向， 均安装有感应介质。
本发明还提供了一种利用上述立环磁选机的粉煤灰磁选除铁的方 法， 所述方法包括： a. 将粉煤灰配置为预定固含量的浆料； b. 利用立环 磁选机对所述浆料进行磁选； c. 检测磁选后的浆料的铁含量； 当浆料 中的铁含量低于或等于预定含量时， 将浆料排出； 当浆料中的铁含量高 于预定含量时， 返回步骤 b通过所述立环磁选机对所述浆料再次进行磁 选。
优选地， 所述立环磁选机的磁场强度为 1.5万高斯以上。
优选地， 利用立环磁选机对所述浆料进行磁选时， 所述立环磁选机 的场强为 1.5万 Gs至 2.0万 Gs。
优选地， 所述方法包括： e. 将排出的浆料压滤为滤饼。
优选地， 在步骤 a中， 将粉煤灰配置为固含量为 20wt%-40wt%的浆 料。
优选地， 排出的浆料通过板筐压滤机进行压滤， 压滤后形成固含量 为 60 wt%-80wt%的滤饼。
采用本发明的磁选设备和方法， 在粉煤灰中铁杂质含量少的情况下 较为彻底地除去铁杂质， 与现有的粉煤灰除铁方法相比， 铁去除效率提 高了 20 %以上， 极大地緩解了后续工艺溶液中除铁的压力， 从而降低了 生产成本， 提高了生产效率。 附图说明
图 1是本发明用于粉煤灰除铁的立环磁选机的结构示意图；
直线变化的模拟计算效果图； 、 、' < 、'
图 3 ( c )是图 3 (a)中特征直线的放大示意图；
图 4是本发明一种实施方式中除铁方法的流程图。 具体实施方式
如图 1所示， 本发明用于粉煤灰除铁的立环磁选机包括： 转环 101、 感应介质 102、 上铁轭 103、 下铁轭 104、 励磁线圏 105、 进料口 106和 尾矿斗 107, 还包括脉动机构 108和冲水装置 109。
转环 101为圆环形载体，其中载有感应介质 102。当转环 101旋转时， 转环 101带动感应介质 102以及感应介质 102吸附的物质运动， 以便完 成物料分选。 转环 101可以由任何适合的材料制成， 例如碳钢等。
电机或其他驱动装置可以为转环 101提供动力， 使得转环 101能够 按照设定速度转动。 优选地， 在本发明的优选实施方式中， 转环 101 转 节转环旋转速度， 以便达到最佳处理效果。
当物料的含铁量或者处理量等参数低于预定值时， 采用较低的转速， 例如 3转 /分钟， 使铁磁性杂质与磁场充分作用， 以使铁磁性杂质被吸附 到感应介质网上， 从而选出杂质。 采用较低的转速驱动转环 101 还可以 减少非磁性矿物 （例如粉煤灰）混入精矿中， 从而提高了精矿产率。
上铁轭 103、 下铁轭 104设置在转环 101下部的环内、 环外两侧， 起 到磁极的作用。 优选地， 上铁轭 103、 下铁轭 104—体形成， 在垂直于转 环 101的平面内环绕设置在转环 101下部的环内、 环外两侧。
感应介质 102安装在转环 101中， 优选地， 在转环 101 , 环绕整个圆 周方向， 均安装有感应介质 102。 由于励磁线圏 105设置在上铁轭和下铁 轭周围， 因此励磁线圏 105产生的磁场使得上铁轭 103和下铁轭 104成 为一对产生垂直方向磁场的磁极。 上铁轭 103和下铁轭 104设置在转环 101下方的内外两侧， 以使转环 101在磁极间旋转。 当转环 101旋转时， 转环 101 中的感应介质 102会经过上铁轭 103和下铁轭 104构成的磁极 对， 被磁化， 以便实现除铁。
在本发明的优选实施方式中， 所述感应介质 102为多层钢板网。 钢 板网由不锈钢制成， 优选地由 1G17制成。 每层钢板网由不锈钢丝梗编 成， 网格为菱形。 所述丝梗的边缘具有棱状尖角。
由于作为感应介质 102的钢板网的边缘为棱角状， 因此， 介质的尖 端磁场更强， 从而产生更好的磁选效果。
优选地， 在本发明中， 钢板网的介质层间距为 2-5mm。 更优选地， 钢板网的介质层间距为 3mm。 优选地， 钢板网的厚度 0.8-1.5mm, 网格 大小为 3mmx 8mm -8mmx 15mm,丝梗宽度 l-2mm。 由于缩小了感应介质 层 102之间的间距， 可以使粉煤灰颗粒直接接触感应介质 102, 从而避免 了磁性颗粒透过介质而未能去除的现象发生。
本发明优选实施方式中， 励磁线圏 105为双玻璃丝包漆包铝扁线， 所述双玻璃丝包漆包铝扁线为实心导体， 相对于传统的空心铜管电磁线 圏， 大大提高了占空比， 加强了聚磁效果， 改善了磁场分布， 并降低了 电耗。 励磁线圏 105 电流采用连续可调电流， 因而磁场也为连续可调磁 场强度的磁场。
优选地， 本发明用于粉煤灰除铁的立环磁选机还包括脉动机构 108, 所述脉动机构 108通过橡胶鼓膜 111与尾矿斗 107相连。 所述脉动机构 可以由偏心连杆机构实现， 由于脉动机构 108通过橡胶鼓膜 111与尾矿 斗 107相连， 从而使脉动机构 108所产生的交变力推动橡胶鼓膜 111往 复运动， 可以使得尾矿斗 107中的矿浆产生脉动。
冲水装置 109位于转环 101的上方， 用于利用水流将磁性物料冲入 精矿斗 113中。 冲水装置 109可以是各种适合的冲水、 喷淋装置， 例如 喷头、 水管等。
进料口 106可以是料斗或进料管。 用于入矿的进料口 106以较小的 落差进入上铁轭 103， 避免了磁性颗粒由于重力作用而透过感应介质 102 的现象发生， 从而提高了磁选除杂的效果。
优选地， 所述立环磁选机还包括冷却装置 112, 所述冷却装置 112设 置在励磁线圏周围， 用于降低励磁线圏的工作温度， 所述冷却装置为均 压腔水套。
产生强磁场的立环磁选机工作时， 励磁线圏 105会产生大量的热量， 有可能导致线圏过热烧毁， 这是对磁选机危害最大的隐患。 如何能更好 的把这些热量散发出来， 使线圏的温度尽可能地降低， 一直是技术难题。 本发明采用均压腔水套作为冷却装置， 避免了以往冷却方式中的弊端， 保证了立环磁选机的安全稳定运转。
均压腔水套优选地采用不锈钢材料制成， 从而不易结垢。 由于在水 套的进出水处均安装均压腔， 所述均压腔保证了水均勾地流经每一层水 套， 并在套内各处充满， 从而防止局部水路短路， 影响散热。 每层水套 的水道横截面积大， 可完全避免水垢堵塞， 即使有一处发生堵塞， 也不 影响水套中循环水的正常流动。 而且水套与线圏大面积紧密接触， 可将 线圏产生的大部分热量通过水流带走。
均压腔水套与普通空心铜管散热相比， 散热效率高， 绕组温升低， 设备励磁功率低。 在额定励磁电流是 40A的情况下， 采用普通空心铜管 散热的磁选机励磁功率为 35kw, 而采用均压腔水套散热的磁选机励磁功 率为 21kw。
在本发明的磁选设备工作时， 进料的矿浆沿上铁轭 103 的缝隙流经 转环 101 , 由于转环 101内的感应介质 102在背景磁场中被磁化， 感应介 质 102表面形成梯度极高的磁场。 矿浆中磁性颗粒在这种极高磁场作用 下吸着在感应介质 102表面， 随转环 101转动， 并被带至转环 101顶部 的无磁场区， 再通过位于顶部的冲水装置 109冲水将磁性物料冲入精矿 斗中。 而非磁性颗粒则沿下铁轭 104的缝隙流入尾矿斗 107中， 进而由 尾矿斗 107的尾矿口排出。
将相同质量的钢板网介质与棒状介质相比， 介质的表面积提高 5倍 以上， 因此磁吸附能力大大增加， 磁性物质被吸附的几率也大大增加， 而且， 钢板网棱角处感应的磁场强度与梯度也比棒状介质有很大提高。
对于本发明立环磁选机， 应用钢板网感应介质层后的磁场分布图如 图 3 ( a ) 所示。 每一纵列的小平行四边形表示一层介质网的横截面， 图 中模拟了五层介质网的磁场介质网的情况， 丝梗形成的网格的横截面为 平行四边形。 以中间的小平行四边形为例， 如图所示， 在该平行四边形 上作了一条特征直线 L, 图 3 ( b ) 示出了模拟计算感应场强随所述特征 直线从 a点到 b点 （参考图 3 ( c ) )的场强变化规律。 可以看出， 其尖端 产生的感应场强最高， 可以达到 22000GS, 即 2.2T。
上述磁场模拟计算是采用 Ansoft Maxwell 10软件实现的。 Ansoft Maxwell 10为 Ansoft公司发布的电磁分析软件， 主要建立在 maxwell方 程基础上进行有限元分析， 是功能强大的电磁场仿真工具。 主要用来分 析二维和三维的电磁部件， 例如电机、 变压器、 激励器以及其他电气和 机电设备， 其应用领域遍及汽车、 军事、 宇航和工业应用等。
在本发明的优选实施方式中， 采用本发明所提供的立环磁选机进行 粉煤灰磁选除铁的方法如图 4所示， 优选地包括下列步骤：
对于粒度较大的粉煤灰物料， 优选将粉煤灰粉碎至预定粒度， 例如 粒度小于 2mm。
在步骤 201 , 将粉煤灰配置为预定浓度的浆料。 优选地， 将粉煤灰加 水， 配成固含量为 20 ~ 40wt Q/ 々浆料。
在步骤 202 , 将配置为预定固含量的浆料在立环式磁选机上进行磁 选。 优选地， 所述立环磁选机的场强为 1.5-2万 Gs。
在步骤 203 ,检测磁选后的浆料的铁含量。对于铁含量的检测可以通 过对浆料取样、 干燥后， 对样品中的铁离子含量进行检测。 对铁离子的 检测可以采用各种适用的化学检测方法或设备。
当浆料中的铁含量低于或等于预定含量时，在步骤 204,将浆料排出； 当浆料中的铁含量高于预定含量时， 返回步骤 202通过所述立环磁选机 对所述浆料进行重复磁选。 所述预定含量可以根据对产品的质量要求和 磁选成本综合考虑， 优选地， 氧化铁的预定含量为 0.8 wt%, 即， 当检测 到氧化铁含量小于或等于 0.8 wt%时， 将浆料放出。
优选地， 在步骤 205, 将排出的浆料进行压滤， 经压滤后形成滤饼。 所述压滤可以通过板筐压滤机实现，优选地，在压滤后形成固含量为 60 ~ 80wt Q/ 々滤饼。
在本发明所述的立环磁选机的具体实施例 1中：
立环磁选机的背景磁场强度 12000GS,励磁电流 40A，钢板网的材质 为 lCrl7，钢板网的介质层间距为 3mm，厚度 lmm，网格大小 5mmxl0mm， 丝梗宽度 1.6mm,棱角方向朝上，此时，网状介质节点场强可达 22000GS, 比传统立式转环感应式湿法强磁选机提高 20%。
实施例 2:
立环磁选机的背景磁场强度 12000GS,励磁电流 40A，钢板网的材质 为 lCrl7，钢板网的介质层间距为 2mm，厚度 lmm,网格大小 3mmx8mm， 丝梗宽度 lmm, 棱角方向朝上， 此时， 网状介质节点场强可达 20000Gs。
实施例 3:
立环磁选机的背景磁场强度 12000GS,励磁电流 50A，钢板网的材质 为 lCrl7 , 钢板网的介质层间距为 5mm , 厚度 1.5mm , 网格大小 5mmxl0mm, 丝梗宽度 2mm, 棱角方向朝上， 此时， 网状介质节点场强 可达 22000Gs。
在本发明所述的磁选方法的实施例中， 作为原料的流化床粉煤灰， 学成分如表 1所示， 单位： wt%：
Figure imgf000010_0001
实施例 4:
取流化床灰加水制成固含为 33wt%的浆料， 用立环磁选机在 1.75万 Gs的磁场下进行磁选， 每次磁选后， 取 10克磁选后的浆料， 经 110°C干 燥后， 检测三价铁离子（TFe203 )和二价铁离子（FeO )的含量（wt% ), 在磁选三次后， 铁离子的含量低于预定值 0.8 wt%, 达到 0.7 wt%。 将所 述浆料排出， 将排出的浆料用板筐压滤机压滤， 压滤后得到固含量为 67.5wtQ/ 々滤饼。 所述滤饼的化学成分如表 2所示 （wt% ):
表 2
Figure imgf000010_0002
对比例 1 :
将表 1 所述的流化床粉煤灰在传统磁选机上进行磁选， 所述传统磁 选机的感应介质为圆棒形不锈钢介质， 相邻圆棒形不锈钢介质之间的间 距为 20mm。在圆棒形不锈钢介质所产生的 1.75万 Gs的磁场下直接进行 磁选， 经过五次磁选后， 所得到的干法磁选后的化学成分（wt% )如表 3 所示：
表 3
Figure imgf000010_0003
可以看出， 随后产品中铁离子的含量为 1.5 wt%, 比用本发明粉煤灰 磁选除铁方法得到的产品的铁含量高出一倍。
实施例 5:
取流化床灰加水制成固含为 20 %的浆料， 用立环磁选机在 1.5万 Gs 的磁场下进行磁选， 每次磁选后， 取 10克磁选后的浆料， 经 110°C干燥 后， 检测三价铁离子 （TFe203 )和二价铁离子 （FeO ) 的含量 （wt% ), 在磁选三次后， 铁离子的含量等于预定值 0.8 wt%。 将所述浆料排出， 将 排出的浆料用板筐压滤机压滤， 压滤后得到固含量为 75.0\¥1 %的滤饼。 所述滤饼的化学成分如表 4所示（ wt% ):
表 4
Figure imgf000011_0001
对比例 2:
将表 1 所述的流化床粉煤灰在传统磁选机上进行磁选， 所述传统磁 选机的感应介质为圆棒形不锈钢介质， 相邻圆棒形不锈钢介质之间的间 距为 25mm。 在圆棒形不锈钢介质所产生的 1.5万 Gs的磁场强度下直接 进行磁选， 经过五次磁选后， 所得到的干法磁选后的化学成分（wt% )如 所示：
Figure imgf000011_0002
可以看出， 随后产品中铁离子的含量为 1.46 wt%, 铁含量同样明显 高出用本发明粉煤灰磁选除铁方法得到的产品。
实施例 6:
取流化床灰加水制成固含为 20wt%的浆料， 用立环磁选机在 2.0万 Gs的磁场下进行磁选， 每次磁选后， 取 10克磁选后的浆料， 经 110°C干 燥后， 检测三价铁离子（TFe203 )和二价铁离子（FeO )的含量（wt% ), 在磁选三次后， 铁离子的含量低于预定值 0.8 wt%, 达到 0.75 wt%。 将所 述浆料排出， 将排出的浆料用板筐压滤机压滤， 压滤后得到固含量为
80.0wt Q/ 々滤饼。 所述滤饼的化学成分如表 6所示 （wt% ):
表 6:
Figure imgf000012_0001
式并不局限于上述的实施方式。 应该认识到： 在不脱离本发明主旨的情 况下， 本领域技术人员可以对本发明做出不同的变化和修改。

Claims

权 利 要 求
1、 一种用于粉煤灰除铁的立环磁选机， 其特征在于， 所述立环磁选 机包括： 转环、 感应介质、 上铁轭、 下铁轭、 励磁线圏、 进料口、 尾矿 斗和冲水装置， 进料口用于输入待除铁的粉煤灰， 尾矿斗用于排出除铁 后的非磁性颗粒， 所述上铁轭和下铁轭分别设置在转环下部的环内、 环 外两侧， 所述冲水装置位于转环上方， 感应介质安装在转环中， 励磁线 圏设置在上铁轭和下铁轭周围， 以使上铁轭和下铁轭成为一对产生垂直 方向磁场的磁极， 其中， 所述感应介质为多层钢板网， 每层钢板网由丝 梗编成， 所述丝梗的边缘具有棱状尖角。
2、 根据权利要求 1所述的立环磁选机， 其特征在于， 上铁轭、 下铁 轭一体形成， 且在垂直于转环的平面内环绕设置在转环下部的环内、 环 外两侧。
3、 根据权利要求 2所述的立环磁选机， 其特征在于， 所述立环磁选 机还包括设置在励磁线圏周围的均压腔水套。
4、 根据权利要求 2所述的立环磁选机， 其特征在于， 所述钢板网由 lCrl7制成。
5、 根据权利要求 4所述的立环磁选机， 其特征在于， 所述励磁线圏 是双玻璃丝包漆包铝扁线电磁线圏。
6、 根据权利要求 5所述的立环磁选机， 其特征在于， 钢板网的介质 层间 巨为 2-5mm。
7、 根据权利要求 6所述的立环磁选机， 其特征在于， 钢板网的介质 层间 巨为 3mm。
8、 根据权利要求 7所述的立环磁选机， 其特征在于， 钢板网的厚度 0.8-1.5mm, 网格大小为 3mm x 8mm -8mm x 15mm, 丝梗宽度 l-2mm。
9、 根据权利要求 8所述的立环磁选机， 其特征在于， 钢板网的厚度 lmm, 网格大小为 5mm X 10mm, 丝梗宽度 1.6mm。
10、 根据权利要求 9所述的立环磁选机， 其特征在于， 所述立环磁 选机还包括脉动机构， 所述脉动机构通过橡胶鼓膜与尾矿斗相连。
11、 根据权利要求 1 所述的立环磁选机， 其特征在于， 在转环中， 环绕整个圆周方向， 均安装有感应介质。
12、 根据权利要求 1-11中任意一项的粉煤灰磁选除铁方法， 其特征 在于， 所述方法包括：
a. 将粉煤灰配置为预定固含量的浆料；
b. 利用立环磁选机对所述浆料进行磁选；
c 检测磁选后的浆料的铁含量；
d. 当浆料中的铁含量低于或等于预定含量时，将浆料排出； 当浆料 中的铁含量高于预定含量时，返回步骤 b,通过所述立环磁选机对所述浆 料再次进行磁选。
13、 根据权利要求 12所述的方法， 其特征在于， 所述立环磁选机的 磁场强度为 1.5万高斯以上。
14、 根据权利要求 13所述的方法， 其特征在于， 利用立环磁选机对 所述浆料进行磁选时， 所述立环磁选机的场强为 1.5万 Gs至 2.0万 Gs。
15、 根据权利要求 12所述的方法， 其特征在于， 所述方法进一步包 括： e. 将排出的浆料压滤为滤饼。
16、 根据权利要求 12所述的方法， 其特征在于， 在步骤 a中， 将粉 煤灰配置为固含量为 20wt%-40wt%的浆料。
17、 根据权利要求 15所述的方法， 其特征在于， 排出的浆料通过板 筐压滤机进行压滤， 压滤后形成固含量为 60 wt%-80wt%的滤饼。
PCT/CN2011/071207 2010-02-23 2011-02-23 用于粉煤灰除铁的立环磁选机及其磁选除铁方法 WO2011103803A1 (zh)

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