Preparation method and equipment of ultra-pure iron concentrate

Abstract

The application discloses a preparation method and equipment of super-pure iron concentrate, S1: fine grinding operation: the magnetite concentrate with TFe grade of 68.0+ / -0.5% and water content of less than or equal to 8% is pre-slurried into a slurry with a mass concentration of 45%, and then is fed into an Aimesha mill for fine grinding; S2: weak magnetic separation-washing concentration operation: the grinding product of the Aimesha mill is fed into a weak magnetic separator for rough separation, and a weak magnetic rough separation concentrate is obtained, and a weak magnetic rough separation tailing is discharged; the weak magnetic rough separation concentrate is demagnetized, and then is fed into an electromagnetic washing machine for concentration, and an electromagnetic washing machine concentration tailing is discharged; S3: the weak magnetic separation concentrate is demagnetized, and then is fed into an electromagnetic washing machine for concentration, and is thrown away again, and is pre-demagnetized; S4: reverse flotation operation: the electromagnetic washing concentrate is demagnetized, and then is fed into a reverse flotation operation, sodium carbonate is used as an adjusting agent in the reverse flotation operation, pre-slurry is carried out, and then dodecylamine is used as a collecting agent for reverse flotation. The application has the effects of improving grinding efficiency and improving the purity of the iron concentrate.

Description

Technical Field

[0001] This invention relates to the field of mineral processing, and in particular to a method and equipment for preparing ultrapure iron concentrate. Background Technology

[0002] Ultra-pure iron concentrate is an important raw material source for iron-based mineral new materials. It typically requires a TFe grade greater than 72.0% and impurities (acid-insoluble matter) such as SiO2 less than 0.2%. It can be widely used in the production of powder metallurgy, magnetic materials, ultra-pure iron and clean steel base materials, electronics, chemicals, environmental protection, food preservation, and medical industries. Its demand is increasing daily with the development of society, economy, and technology. Compared to ordinary iron concentrate, ultra-pure iron concentrate has higher technological content and added value, and its selling price is 3 to 5 times that of ordinary iron concentrate. Its processing and production are of great significance for improving the economic benefits of enterprises, fully utilizing the value of my country's limited high-quality mineral resources, and promoting the advancement of mineral processing technology and product upgrading.

[0003] Chinese invention patent CN1920066A discloses a method for producing ultrapure iron concentrate, which involves increasing the iron content of low-grade iron concentrate (60-66%) to approximately 71%. The method involves grinding the low-grade iron concentrate (60-66%) with a particle size of 160-180 mesh, separating it into 260-mesh powder using a separator, adding a water-water mixture composed of a strong alkaline agent (15-22% concentration), loading it into a reaction vessel, stirring, heating to 200°C, and maintaining the pressure at 0.6 MPa for 8 hours before unloading. The unloaded material is placed in a sedimentation tank for precipitation; the upper part of the precipitate is a sodium silicate solution (a byproduct), and the lower part is the ultrapure iron concentrate.

[0004] In the relevant technology, Chinese invention patent with publication number CN1920066A discloses a method for producing super iron concentrate from low-grade magnetite ore, including (1) first-stage grinding: grinding crushed iron ore with an iron content of less than 30% in a grate-type or overflow-type ball mill; (2) first-stage weak magnetic separation: feeding the overflow of the classifier into a weak magnetic separator for separation; (3) second-stage grinding: feeding the coarse magnetite concentrate obtained by weak magnetic separation into a small mill for further fine grinding; (4) second-stage weak magnetic separation: feeding the overflow of the classifier from the regrinding into a magnetic separator for second-stage weak magnetic separation for two-stage separation; (5) reverse flotation: feeding the magnetite concentrate obtained by the second-stage weak magnetic separation into a flotation machine after adding reagents, adjusting the slurry, and stirring; (6) product processing: concentrating, filtering, and drying the bottom material of the reverse flotation tank to obtain super iron concentrate.

[0005] Regarding the aforementioned technologies, existing super iron concentrate production processes mainly employ fine grinding, magnetic separation, and flotation, or fine grinding, magnetic separation, flotation, and chemical leaching. However, these processes have the following shortcomings: the grinding method is singular, resulting in low grinding efficiency and high energy consumption; most reverse flotation operations only add amine reagents without pre-conditioning the slurry, leading to poor flotation performance and high SiO2 impurity content in the concentrate. Summary of the Invention

[0006] In order to improve grinding efficiency and increase the purity of iron concentrate, this application provides a method and equipment for preparing ultrapure iron concentrate.

[0007] In the first aspect, this application provides a method for preparing ultrapure iron concentrate, which adopts the following technical solution:

[0008] A method for preparing ultrapure iron concentrate includes the following steps: S1: Fine grinding operation: Magnetite concentrate with a TFe grade of 68.0±0.5% and a water content of ≤8% is pre-pulped into a slurry with a mass concentration of 45%, and then fed into an abrasive mill (1) for fine grinding. The grinding concentration of the abrasive mill (1) is controlled at about 45%, and the product particle size is controlled at -0. 0.038mm accounts for more than 94%; S2: Weak magnetic separation-washing and cleaning operation: The grinding product of the sand mill (1) is fed into the weak magnetic separator for roughing to obtain weak magnetic roughing concentrate and discharge weak magnetic roughing tailings; After demagnetizing the weak magnetic roughing concentrate, it is fed into the electromagnetic washing machine for cleaning to obtain electromagnetic washing machine cleaned concentrate and discharge electromagnetic washing machine cleaned tailings; The mass concentration of the underflow concentrate slurry of the electromagnetic washing machine is controlled at 50-60%, the weak magnetic roughing adopts a permanent magnet drum magnetic separator, and the cleaning adopts a concentrate washing machine. The magnetic field strength of the weak magnetic roughing is 80mT; S3: After demagnetization, the weak magnetic separation concentrate is fed into an electromagnetic washing machine for further cleaning, followed by tailings removal, with the concentration of the underflow concentrate controlled at 50-60%. The underflow concentrate is then diluted to 25-30% for pre-demagnetization. S4: Reverse flotation operation: The electromagnetically washed concentrate is demagnetized and fed into the reverse flotation operation. For the roughing stage, 1200 g / t of sodium carbonate and 130 g / t of collector are added. For the cleaning stage, 400 g / t of sodium carbonate and 32 g / t of collector are added. The reverse flotation operation uses an open-circuit process with one roughing and one cleaning stage, achieving a TFe grade of 72% at the bottom of the flotation cell. The ultrapure iron concentrate with a content of 0.2%, SiO2 content of 0.13%, and acid-insoluble matter of 0.16% was used for flotation. The flotation froth was high-purity iron concentrate with a TFe content of 70.7%. Sodium carbonate was used as a modifier for pre-conditioning the slurry in reverse flotation, and then dodecylamine was used as a collector for reverse flotation. The modifier was prepared as a 10% solution, and the collector was prepared at a molar ratio of dodecylamine to glacial acetic acid of 1:1. The reagent system was as follows: 1200 g / t of modifier for roughing and 130 g / t of collector for collecting; 400 g / t of modifier for cleaning and 32 g / t of collector for cleaning.

[0009] By adopting the above technical solution, the iron concentrate is pre-pulped and then finely ground using an azin mill, improving grinding efficiency. Following magnetic separation and reverse flotation, with sodium carbonate as a modifier and dodecylamine as a collector, effective separation of magnetite and quartz (SiO2) can be achieved without the addition of a frother, improving concentrate quality and yielding ultrapure iron concentrate with a TFe grade of 72.2%, SiO2 content of 0.13%, and acid-insoluble matter of 0.16% at the bottom of the flotation cell, and high-purity iron concentrate with a TFe grade of 70.7% at the flotation froth. The overall cost is low, the recovery rate is high, and the produced super iron concentrate is of high quality, making it easy to implement large-scale industrial production.

[0010] Secondly, the equipment for preparing ultrapure iron concentrate provided in this application adopts the following technical solution:

[0011] A device for preparing ultrapure iron concentrate includes a frame, a cylinder mounted on the frame, a rotating shaft rotatably mounted inside the cylinder, and a power mechanism for driving the rotating shaft to rotate. The power mechanism is fixed to the frame. A plurality of stirring discs are mounted on the rotating shaft, and a grading structure is installed at the end of the rotating shaft.

[0012] By adopting the above technical solution, the rotating shaft drives the grading structure, and the rotation generates centrifugal force. The centrifugal force naturally concentrates fine particles towards the central area of ​​the shaft, while coarse particles are thrown towards the edge. Due to the squeezing of the upstream coarse and fine particle slurry, qualified product particles are discharged, while coarse particles return to the upstream along the cylinder wall to continue grinding until they reach the qualified particle size.

[0013] Preferably, the grading structure includes a fixed flange fixedly connected to the rotating shaft, a plurality of impeller plates fixedly connected to the fixed flange, a hoop fixedly connected to the side of the impeller plate away from the fixed flange, and a detachable flange detachably connected to the hoop. The fixed flange has a flow hole, and the detachable flange has a discharge hole.

[0014] By adopting the above technical solution, iron concentrate is filled into the classification structure. The rotation of the shaft can drive the classification structure to rotate, so that the ground slurry can flow out and the unground ore can continue to be ground. The detachable flange and the hoop are detachably connected, which facilitates the cleaning of the inside of the classification device after the grinding work is completed.

[0015] Preferably, the detachable flange has an insertion hole on the side near the hoop, and a rod that can be inserted into the insertion hole is fixedly connected to the hoop. A sliding hole is provided on the side of the insertion hole, and a locking groove is provided on the rod. A locking rod that can be inserted into the locking groove is slidably disposed in the sliding hole. The detachable flange is also provided with a resistance mechanism to prevent the locking rod from sliding away from the rod and a driving mechanism to drive the locking rod to slide away from the rod.

[0016] By adopting the above technical solution, when the insertion rod is inserted into the insertion hole, the locking rod can be stably inserted into the locking groove under the restriction of the resistance mechanism. Under the driving action of the drive mechanism, the locking rod can be driven to slide away from the insertion rod and disengage from the locking groove, thereby facilitating the disassembly and assembly of the detachable flange and thus facilitating the cleaning of the interior of the graded structure.

[0017] Preferably, a limiting groove is formed on the inner wall of the sliding hole, a limiting block is fixedly connected to the locking rod, and the resistance mechanism includes a thrust spring disposed in the limiting groove. One end of the thrust spring abuts against the side of the limiting block away from the insertion rod, and the other end of the thrust spring abuts against the side wall of the limiting groove away from the insertion rod.

[0018] By adopting the above technical solution, one end of the thrust spring abuts against the side of the limiting block away from the insert rod, and the other end of the thrust spring abuts against the side wall of the limiting groove away from the insert rod, so that the limiting rod can be stably inserted into the limiting groove and the detachable flange can be stably fixed on the hoop.

[0019] Preferably, multiple insertion rods are fixed on the hoop, and multiple insertion holes are provided on the detachable flange. Each insertion rod corresponds to one insertion hole. A circular groove is provided on the side of the detachable flange away from the fixed flange. The sliding hole communicates with the circular groove. One end of the locking rod away from the insertion rod extends into the circular groove. The driving mechanism includes an unlocking disc rotatably disposed in the circular groove. A circular clearance groove is provided on the side of the unlocking disc near the fixed flange. A push block is fixedly connected to the inner circumferential wall of the circular clearance groove. A first inclined surface is provided on the side of the push block near the axis of the unlocking disc. An unlocking block is provided at one end of the locking rod located in the circular groove. A second inclined surface is provided on the unlocking block that can abut against the first inclined surface. Each push block corresponds to one unlocking block.

[0020] By adopting the above technical solution, when the unlocking disc is rotated, under the action of the first inclined surface and the second inclined surface, the push block can drive the locking rod to slide away from the insertion rod through the unlocking block, so that multiple locking rods can simultaneously disengage from the locking groove on the insertion rod, which facilitates the disassembly of the detachable flange.

[0021] Preferably, a first annular groove is formed on the inner peripheral wall of the circular groove, and a retaining ring is fixedly connected to the outer peripheral surface of the unlocking circular plate, the retaining ring being rotatably disposed in the first annular groove.

[0022] By adopting the above technical solution, the retaining ring is rotatably set in the first annular groove, thereby enabling the unlocking disc to be more stably rotatably set in the circular groove.

[0023] Preferably, a second annular groove is formed on the inner peripheral wall of the circular groove, and a coil spring is provided in the second annular groove. One end of the coil spring is fixed to the inner peripheral wall of the second annular groove, and the other end of the coil spring is fixed to the outer peripheral surface of the unlocking circular plate.

[0024] By adopting the above technical solution, under the elastic force of the coil spring, the first inclined surface on the push block can be kept detached from the second inclined surface.

[0025] Preferably, the locking rod has a third inclined surface at the end near the insertion rod, and the third inclined surface faces the side near the fixing flange.

[0026] By adopting the above technical solution, the third inclined surface is located at the end of the locking rod near the insertion rod, and the third inclined surface faces the side near the fixed flange, which facilitates the insertion rod being inserted into the insertion hole.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By pre-slurrying the iron concentrate and then finely grinding it using an abrasive mill, grinding efficiency is improved. Following magnetic separation and reverse flotation, with sodium carbonate as a modifier and dodecylamine as a collector, effective separation of magnetite and quartz (SiO2) can be achieved without the addition of a frother, improving concentrate quality and yielding ultrapure iron concentrate with a TFe grade of 72.2%, SiO2 content of 0.13%, and acid-insoluble matter of 0.16% at the bottom of the flotation cell, and high-purity iron concentrate with a TFe grade of 70.7% at the flotation froth. This method features low overall cost, high recovery rate, and high-quality super iron concentrate, making it suitable for large-scale industrial production.

[0029] 2. The rotating shaft drives the grading structure. The rotation generates centrifugal force, which naturally concentrates fine particles towards the central area of ​​the shaft and throws coarse particles towards the edge. Due to the squeezing of coarse and fine particles in the upstream slurry, qualified product particles are discharged, while coarse particles return to the upstream along the cylinder wall to continue grinding until they reach the qualified particle size.

[0030] 3. After the insertion rod is inserted into the insertion hole, under the restriction of the resistance mechanism, the locking rod can be stably inserted into the locking groove. Under the driving action of the drive mechanism, the locking rod can be driven to slide away from the insertion rod and disengage from the locking groove, thereby facilitating the disassembly and assembly of the detachable flange and thus facilitating the cleaning of the interior of the graded structure. Attached Figure Description

[0031] Figure 1 This is a process flow diagram of the preparation method of ultrapure iron concentrate in the embodiments of this application.

[0032] Figure 2 This is a schematic diagram of the overall structure of the sand mill in the embodiments of this application.

[0033] Figure 3 This is a cross-sectional view of the cylinder in an embodiment of this application.

[0034] Figure 4 This is an exploded view of the hierarchical structure in the embodiments of this application.

[0035] Figure 5 This is a cross-sectional view of the detachable flange in an embodiment of this application.

[0036] Figure 6 This is a schematic diagram of the overall structure of the unlocking circular plate in an embodiment of this application.

[0037] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Cylinder; 21. Support rod; 3. Rotating shaft; 4. Mixing disc; 5. Power mechanism; 51. Electric motor; 6. Grading structure; 61. Fixed flange; 611. Flow hole; 62. Impeller plate; 63. Hoop ring; 64. Removable flange; 641. Discharge hole; 642. Insertion hole; 643. Sliding hole; 644. Limiting groove; 645. Circular groove; 646. First annular groove; 647. 65. Second annular groove; 66. Insert rod; 67. Locking groove; 68. Locking rod; 69. Limiting block; 60. Third inclined surface; 61. Unlocking block; 62. Second inclined surface; 63. Resistance mechanism; 64. Thrust spring; 65. Drive mechanism; 66. Unlocking circular plate; 67. Circular clearance groove; 68. Push block; 69. First inclined surface; 60. Retaining ring; 61. Coil spring; 62. Sand mill. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0039] This application discloses a method for preparing ultrapure iron concentrate, referring to... Figure 1 As shown, the process includes the following steps: S1: Fine grinding operation: Magnetite concentrate with a TFe grade of 68.0±0.5% and a water content of ≤8% is pre-pulped into a slurry with a mass concentration of 45%, and then fed into an abrasive mill 100 for fine grinding. The grinding concentration of the abrasive mill 100 is controlled at around 45%, and the product particle size is controlled at -0. 0.038mm accounts for more than 94%; S2: Weak magnetic separation-washing and cleaning operation: The grinding product of the 100mm sand mill is fed into a weak magnetic separator for roughing to obtain weak magnetic roughing concentrate, and the weak magnetic roughing tailings are discharged; After demagnetizing the weak magnetic roughing concentrate, it is fed into an electromagnetic washing machine for cleaning to obtain electromagnetic washing machine cleaned concentrate, and the electromagnetic washing machine cleaned tailings are discharged; The mass concentration of the underflow concentrate slurry of the electromagnetic washing machine is controlled at 50-60%. The weak magnetic roughing uses a permanent magnet drum magnetic separator, and the cleaning uses a concentrate washing machine. The magnetic field strength of the weak magnetic roughing is 80mT; S3: The weak magnetic concentrate is processed by... After demagnetization, the concentrate is fed into an electromagnetic washing machine for further cleaning, followed by tailings removal, with the concentration of the underflow concentrate controlled at 50-60%. The underflow concentrate is then diluted to 25-30% for pre-demagnetization. S4: Reverse flotation operation: The electromagnetically washed concentrate is demagnetized and fed into the reverse flotation operation. For the roughing stage, 1200 g / t of sodium carbonate and 130 g / t of collector are added. For the cleaning stage, 400 g / t of sodium carbonate and 32 g / t of collector are added. The reverse flotation operation uses an open-circuit process with one roughing and one cleaning stage, yielding a TFe grade of 72.2% and a SiO2 content of 0% at the bottom of the flotation cell. The ultrapure iron concentrate with 0.13% Fe and 0.16% acid-insoluble matter was used for flotation. The flotation froth was high-purity iron concentrate with 70.7% TFe grade. Sodium carbonate was used as a modifier for pre-conditioning the slurry in reverse flotation, and then dodecylamine was used as a collector for reverse flotation. The modifier was prepared as a 10% solution, and the collector was prepared at a molar ratio of dodecylamine to glacial acetic acid of 1:1. The reagent system was as follows: 1200 g / t of modifier for roughing and 130 g / t of collector for cleaning; 400 g / t of modifier for cleaning and 32 g / t of collector for cleaning.

[0040] This application also discloses an apparatus for preparing ultrapure iron concentrate. (Refer to...) Figure 2 and Figure 3 As shown, the sand mill 100 includes a frame 1, a cylinder 2, a rotating shaft 3, a mixing disc 4, and a power mechanism 5. The frame 1 is fixedly installed on the ground, the cylinder 2 is horizontally arranged on the frame 1, and a support rod 21 is vertically fixed at the bottom of the cylinder 2. The support rod 21 is horizontally slidable on the frame 1 through a slide rail and a slider, so that the cylinder 2 can be horizontally slidable on the frame 1.

[0041] Reference Figure 2 and Figure 3As shown, the rotating shaft 3 is rotatably mounted on the frame 1 and horizontally inserted into the cylinder 2. Multiple stirring discs 4 are fixedly connected to the rotating shaft 3, and are evenly distributed along the axis of the shaft 3. The power mechanism 5 is an electric motor 51, which is fixedly installed on the side of the frame 1 away from the cylinder 2. The output shaft of the electric motor 51 is coaxially fixedly connected to the rotating shaft 3.

[0042] Reference Figure 3 and Figure 4 As shown, a graded structure 6 is fixedly installed at the end of the rotating shaft 3 away from the motor 51. The graded structure 6 includes a fixed flange 61, impeller plates 62, a clamping ring 63, a detachable flange 64, a plug rod 65, a locking rod 66, and a resistance mechanism 67. The fixed flange 61 is fixedly connected to the end of the rotating shaft 3 away from the motor 51 by bolts. The fixed flange 61 has several flow holes 611, which are evenly distributed along the circumference of the fixed flange 61. Several impeller plates 62 are fixedly connected to the end face of the fixed flange 61 away from the motor 51, and the impeller plates 62 are evenly distributed along the circumference of the fixed flange 61.

[0043] Reference Figure 3 and Figure 4 As shown, the clamping ring 63 is fixedly connected to the side of the impeller plate 62 away from the fixed flange 61. The axis of the clamping ring 63 coincides with the axis of the fixed flange 61. The detachable flange 64 is detachably connected to the clamping ring 63. The detachable flange 64 has several discharge holes 641, which are symmetrically distributed along the circumference of the detachable flange 64.

[0044] Reference Figure 3 and Figure 4 As shown, the detachable flange 64 has four insertion holes 642 on its side near the clamping ring 63, and the four insertion holes 642 are symmetrically distributed along the circumference of the detachable flange 64. Four insertion rods 65 are horizontally fixedly connected to the clamping ring 63. When the detachable flange 64 abuts against the clamping ring 63, the four insertion rods 65 are respectively inserted into the four insertion holes 642.

[0045] Reference Figure 4 and Figure 5 As shown, each of the insertion holes 642 has a sliding hole 643 on its side, and each of the insertion rods 65 has a locking groove 651. There are four locking rods 66, which are slidably disposed in the four sliding holes 643 respectively. The end of the locking rod 66 near the insertion rod 65 has a third inclined surface 662, which faces the side near the fixed flange 61.

[0046] Reference Figure 4 and Figure 5As shown, a limiting groove 644 is formed on the inner wall of the sliding hole 643. A limiting block 661 is fixedly connected to the locking rod 66. The resistance mechanism 67 includes a thrust spring 671 disposed in the limiting groove 644. One end of the thrust spring 671 abuts against the side of the limiting block 661 away from the insertion rod 65, and the other end of the thrust spring 671 abuts against the side wall of the limiting groove 644 away from the insertion rod 65. This prevents the locking rod 66 from sliding away from the insertion rod 65, so that one end of the locking rod 66 is stably inserted into the locking groove 651.

[0047] Reference Figure 4 and Figure 6 As shown, a circular groove 645 is provided on the side of the detachable flange 64 away from the fixed flange 61. A sliding hole 643 is connected to the circular groove 645. The end of the locking rod 66 away from the insertion rod 65 extends into the circular groove 645. The driving mechanism 68 includes an unlocking disc 681 rotatably disposed in the circular groove 645. A circular clearance groove 6811 is provided on the side of the unlocking disc 681 near the fixed flange 61. A push block 682 is fixedly connected to the inner peripheral wall of the circular clearance groove 6811. A first inclined surface 6821 is provided on the side of the push block 682 near the axis of the unlocking disc 681. An unlocking block 663 is provided at one end of the locking rod 66 located in the circular groove 645. A second inclined surface 6631 that can abut against the first inclined surface 6821 is provided on the unlocking block 663. The push block 682 and the unlocking block 663 correspond one-to-one.

[0048] Reference Figure 4 and Figure 6 As shown, a first annular groove 646 is formed on the inner peripheral wall of the circular groove 645. A retaining ring 684 is fixedly connected to the outer peripheral surface of the unlocking circular plate 681, and the retaining ring 684 is rotatably disposed in the first annular groove 646. A second annular groove 647 is formed on the inner peripheral wall of the circular groove 645. A coil spring 685 is disposed in the second annular groove 647. One end of the coil spring 685 is fixed to the inner peripheral wall of the second annular groove 647, and the other end of the coil spring 685 is fixed to the outer peripheral surface of the unlocking circular plate 681.

[0049] Reference Figure 4 As shown, the unlocking disc 681 has an internal hexagonal groove on the side away from the fixed flange 61, which facilitates the rotation of the unlocking disc 681.

[0050] The implementation principle of the equipment for preparing ultrapure iron concentrate in this application embodiment is as follows: the rotating shaft drives the classification structure 6, and the rotation generates centrifugal force. The centrifugal force naturally concentrates fine particles towards the central area of ​​the shaft, while coarse particles are thrown towards the edge. Due to the squeezing of the upstream coarse and fine particle slurry, qualified product particles are discharged, while coarse particles return to the upstream along the cylinder wall to continue grinding until they reach the qualified particle size.

[0051] When the unlocking disc 681 is rotated, under the action of the first inclined surface 6821 and the second inclined surface 6631, the push block 682 can drive the locking rod 66 to slide away from the insertion rod 65 through the unlocking block 663, so that multiple locking rods 66 can simultaneously disengage from the locking groove 651 on the insertion rod 65, which facilitates the disassembly of the detachable flange 64.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for preparing ultrapure iron concentrate, characterized in that: The invention includes an artemisia sand mill (100), which includes a frame (1), a cylinder (2) mounted on the frame (1), a rotating shaft (3) rotatably mounted inside the cylinder (2), and a power mechanism (5) for driving the rotating shaft (3) to rotate. The power mechanism (5) is fixed on the frame (1). The rotating shaft (3) is provided with a plurality of stirring discs (4), and a grading structure (6) is installed at the end of the rotating shaft (3). The graded structure (6) includes a fixed flange (61) fixedly connected to the rotating shaft (3), a plurality of impeller plates (62) fixedly connected to the fixed flange (61), a hoop (63) fixedly connected to the side of the impeller plate (62) away from the fixed flange (61), and a detachable flange (64) detachably connected to the hoop (63). The fixed flange (61) is provided with a flow hole (611), and the detachable flange (64) is provided with a discharge hole (641). The detachable flange (64) has an insertion hole (642) on the side near the hoop (63). A rod (65) that can be inserted into the insertion hole (642) is fixedly connected to the hoop (63). A sliding hole (643) is provided on the side of the insertion hole (642). A locking groove (651) is provided on the rod (65). A locking rod (66) that can be inserted into the locking groove (651) is slidably disposed in the sliding hole (643). The detachable flange (64) is also provided with a resistance mechanism (67) for preventing the locking rod (66) from sliding away from the rod (65) and a driving mechanism (68) for driving the locking rod (66) to slide away from the rod (65). A limiting groove (644) is provided on the inner wall of the sliding hole (643), and a limiting block (661) is fixedly connected to the locking rod (66). The resistance mechanism (67) includes a thrust spring (671) disposed in the limiting groove (644). One end of the thrust spring (671) abuts against the side of the limiting block (661) away from the insertion rod (65), and the other end of the thrust spring (671) abuts against the side wall of the limiting groove (644) away from the insertion rod (65). Multiple insertion rods (65) are fixed on the hoop (63), and multiple insertion holes (642) are provided on the upper side of the detachable flange (64). Each insertion rod (65) and insertion hole (642) corresponds to one another. A circular groove (645) is provided on the side of the detachable flange (64) away from the fixed flange (61). The sliding hole (643) communicates with the circular groove (645). One end of the locking rod (66) away from the insertion rod (65) extends into the circular groove (645). The driving mechanism (68) includes an unlocking disc (681) rotatably disposed in the circular groove (645). The unlocking disc (681) has a circular clearance groove (6811) on its side near the fixed flange (61). A push block (682) is fixedly connected to the inner circumferential wall of the circular clearance groove (6811). A first inclined surface (6821) is provided on the side of the push block (682) near the axis of the unlocking disc (681). An unlocking block (663) is provided at one end of the locking rod (66) located in the circular groove (645). A second inclined surface (6631) is provided on the unlocking block (663) that can abut against the first inclined surface (6821). The push block (682) and the unlocking block (663) correspond one-to-one.

2. The equipment for preparing ultrapure iron concentrate according to claim 1, characterized in that: The inner circumferential wall of the circular groove (645) is provided with a first annular groove (646), and a retaining ring (684) is fixedly connected to the outer circumferential surface of the unlocking circular plate (681). The retaining ring (684) is rotatably disposed in the first annular groove (646).

3. The equipment for preparing ultrapure iron concentrate according to claim 1, characterized in that: A second annular groove (647) is provided on the inner peripheral wall of the circular groove (645). A coil spring (685) is provided in the second annular groove (647). One end of the coil spring (685) is fixed to the inner peripheral wall of the second annular groove (647), and the other end of the coil spring (685) is fixed to the outer peripheral surface of the unlocking circular plate (681).

4. The equipment for preparing ultrapure iron concentrate according to claim 1, characterized in that: The locking rod (66) has a third inclined surface (662) at the end near the insertion rod (65), and the third inclined surface (662) faces the side near the fixed flange (61).

Images