Combined device for removing trace iron in ceramic raw materials

Abstract

The invention discloses a combined device for removing trace iron in a ceramic raw material, which comprises a first-stage iron removal body and a second-stage iron removal body, the second-stage iron removal body comprises an outer cylinder, the outer cylinder is provided with a support cylinder capable of rotating reversely, and a raw material distributor (4) fixed on the inner wall of the outer cylinder is arranged between the support cylinder and a raw material feeding pipe. Electromagnetic blocks are fixedly arranged on the surface of the supporting barrel at intervals, the electromagnetic blocks are divided into an abcd area and an ad area on the section of the supporting barrel, a wedge-shaped pressing block is arranged on the supporting barrel opposite to the point a position of the ad area, an arc-shaped contact plate is arranged on an end plate of the outer barrel, and the first-stage iron removal body comprises two crushing iron removal rollers which vertically and oppositely rotate up and down. The crushing and deironing roller comprises a rotary drum body capable of rotating, comb teeth are arranged on the rotary drum body, and a strong magnetic plate is fixedly arranged on the rotary drum body between the comb teeth. According to the invention, cleaning materials and working hours are saved, the deironing cost is reduced, the deironing effect is good, and 60-70% of iron substances in raw materials can be reduced.

Description

Technical Field

[0001] The invention relates to an iron removal device, in particular to an iron removal device specially used for removing trace iron in ceramic raw materials. Background Art

[0002] Ceramic products are made of clay, quartz (alumina) and feldspar as the main raw materials and a small amount of various natural minerals through crushing, mixing, molding and calcining. Since ceramic raw materials generally contain a certain amount of iron, ceramics with high iron content will melt into a glassy substance during the sintering process. Not only is it easy to form many small spots on the ceramic surface points, and will increase the brittleness of ceramic products. Thin-walled ceramic products are prone to deformation and cracking. Thereby affecting the intrinsic and appearance quality of ceramics. In order to ensure the quality and performance of ceramic products, the iron content in various raw materials for manufacturing ceramic products is limited by process. If the iron content in the raw materials exceeds the process requirements, the raw materials must be deironed. At present, the method for removing iron from ceramic raw materials is mainly in the ceramic slurry stage, and a magnetic rod device is set in the slurry tank for wet deironing. This wet deironing device has the following problems in use: first, a layer of slurry will adhere to the surface of the magnetic rod after a certain period of use, and the magnetic attraction decreases, and the deironing effect is not very good. Second, the magnetic rod needs to be cleaned after a certain period of use, which is troublesome to clean, and the cleaning workload and labor intensity are large, and the time is long, which not only reduces the deironing effect, but also increases the labor cost. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, the present invention provides a ceramic raw material iron removal device which can remove iron in a dry state, does not need to clean the magnet (magnetic block), has a compact structure and good iron removal effect, and can reduce work intensity and labor time cost.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a combined device for removing trace iron in ceramic raw materials, which includes a primary iron removal body and a secondary iron removal body, the secondary iron removal body includes an outer cylinder, a raw material feed pipe with one end located at the upper part of the outer cylinder and connected to the inner cavity of the outer cylinder, a raw material discharge hopper and an iron material discharge hopper respectively connected to the lower end of the outer cylinder, the outer cylinder is provided with a supporting cylinder body that can rotate counterclockwise through a rotating tube shaft, a raw material distributor fixed on the inner wall of the outer cylinder is provided between the supporting cylinder body and the raw material feed pipe, the raw material distributor is in an arc shape and is spaced apart thereon with grid-like distribution holes. The raw material injection hole is provided with electromagnetic blocks at fixed intervals on the surface of the support cylinder. The electromagnetic blocks are divided into an abcd area with a central angle of 280° and an ad area with a central angle of 80° on the cross section of the support cylinder. The electromagnetic blocks on the abcd area of ​​the support cylinder are connected in series with each other by wires, and the ad area is connected in series with each other by wires. The electromagnetic blocks in the abcd area and the ad area are connected in parallel and pass through the rotating shaft tube to be connected to the rotating electric connector mounted on one end of the rotating shaft tube. A wedge-shaped pressing block is provided on the support cylinder at a relative position of point a in the ad area, and a pressing block is provided at the end point a corresponding to the ad area. An arc-shaped contact plate is fixedly arranged on the end plate of the outer cylinder between the positions of the end points a and d. When the pressing block rotates counterclockwise with the supporting cylinder body and contacts the arc-shaped contact plate at the end point a and is displaced by pressure, the arc-shaped contact plate is pressed and moves to squeeze the normally closed switch to make it disconnected. At this time, the electromagnetic block rotating counterclockwise to the ad area is powered off and demagnetized, and the iron material adhering to the electromagnetic block in the ad area falls off from the electromagnet and enters the iron material box through the iron material outlet; when the pressing block continues to rotate counterclockwise with the supporting cylinder body to contact the arc-shaped contact plate at the end point d and is displaced by pressure, the arc-shaped contact plate at the end point d is pressed and moves to squeeze the normally open switch to make it closed. At this time, the ad area is closed. The electromagnetic block in the domain is charged and magnetized, and a partition is arranged at the lower end of the outer cylinder to separate the raw material discharge hopper and the iron material discharge hopper; the first-level iron removal body is arranged in the raw material feed pipe, and the first-level iron removal body includes two relatively rotating crushing and iron removal rollers vertically distributed above and below the raw material input belt, and the crushing and iron removal rollers include a rotatable rotating drum body, and a plurality of rows of comb teeth are arranged alternately or parallelly on the rotating drum body, and comb teeth are arranged at intervals on the cross section of each row, and strong magnetic plates are fixedly arranged on the rotating drum body between the comb teeth, and magnetic strips are arranged at intervals on the strong magnetic plates, and a raw material guide trough is arranged between the raw material input belt and the crushing and iron removal rollers.

[0005] The working process of the present invention is as follows: ceramic raw materials are fed into two crushing and iron-removing rollers that rotate up and down relatively (rotating speed 50-100 rpm) through a raw material input belt, the raw materials are crushed into fine powder particles by the comb teeth on the two crushing and iron-removing rollers, and the iron in the raw materials is removed for the first time by the strong magnetic force of the strong magnetic plate with magnetic strips on the crushing and iron-removing rollers; the raw materials after the first iron removal are projected onto the raw material distributor through rotation, and then sprayed onto the electromagnetic block in the abcd area on the supporting cylinder through the raw material distributor. When the supporting cylinder rotates counterclockwise, the iron in the raw materials is adsorbed on the electromagnet block. The raw material falls into the cavity of the abcd area between the supporting cylinder and the outer cylinder and enters the raw material discharge hopper through the raw material discharge port and flows onto the raw material output belt. When the supporting cylinder rotates counterclockwise (speed 40-60 rpm) until the pressing block on it contacts the arc contact plate at the a end point, the arc contact plate is pressed to move, and the arc contact plate squeezes the normally closed switch to disconnect it, and the electromagnet in the ad area is demagnetized. The iron adsorbed on the electromagnet block in the ad area falls from the supporting cylinder into the cavity of the ad area and enters the iron material box through the iron material outlet, thereby performing the second iron removal. When the supporting cylinder rotates counterclockwise until the pressing block on it contacts the arc contact plate at the d end point, the arc contact plate is pressed to move, and the arc contact plate squeezes the normally open switch to close it, and the electromagnet in the ad area is electromagnetized, and the electromagnet in the ad area enters the abcd area to contact the raw material. In this cycle, the raw material can be continuously iron-removed for the second time.

[0006] The present invention adopts a two-stage iron removal device to remove iron from dry ceramic raw materials. Firstly, it can avoid the problems existing in the prior art of removing iron in a wet state when preparing ceramic slurry; secondly, the two-stage iron removal can improve the iron removal effect, wherein the first-stage iron removal body has two relatively rotating crushing and iron removal rollers vertically distributed above and below the raw material input belt, and the crushing and iron removal rollers have a rotating drum body with comb teeth and strong magnetic plates. The ceramic raw materials are crushed and the iron in the raw materials is adsorbed at the same time, and about 20% of the iron in the raw materials can be adsorbed; wherein the secondary iron removal body continuously adsorbs and separates, and about 40-50% of the iron in the raw materials can be adsorbed, and at least 60-70% of the iron in the raw materials can be removed cumulatively, so that the ceramic raw materials can meet the technical requirements for the iron content in the raw materials, thereby ensuring that the iron content in the ceramic slurry meets the technical requirements.

[0007] Technical requirements for the iron content (Fe2O3) of the main raw materials of ceramic products: 1. First-class or superior products, clay: ≤0.8-1%, quartz: ≤0.1%, feldspar: ≤0.15%, alumina: ≤0.20%, 2. Second-class products: clay: ≤1.5%, quartz: ≤0.15%, feldspar: ≤0.25%, alumina: ≤0.35%, 3. Qualified products: clay: ≤2%, quartz: ≤0.25%, feldspar: ≤0.5%, alumina: ≤0.50%, The main raw materials for making ceramic products are: 40-60% clay, 30-50% quartz and 5-10% feldspar.

[0008] Among the existing clay minerals, the iron oxide content of kaolin with higher industrial mining value is generally 1.5-2.7%; the iron oxide content of quartz minerals with higher industrial mining value is generally less than 1%; the iron oxide content of bauxite minerals with higher industrial mining value is generally 1-2%.

[0009] Compared with the prior art, the present invention has the following characteristics 1. In dry state, the magnet (magnetic block or magnetic rod) will not have any residue or slurry adhering to it. It does not need to be cleaned after long-term use, which saves cleaning materials and cleaning time, and can reduce the cost of iron removal. 2. The invention has a compact structure, is easy to manufacture and maintain, and is stable and safe to operate. 3. The present invention has good iron removal effect, can reduce 60-70% of the iron in the raw material, has high iron removal efficiency, and can remove iron from 3-5 tons of raw materials per hour. 4. In the secondary iron removal of the present invention, a number of charged magnetic blocks are arranged in parallel or staggered intervals on the cylindrical side of the rotating supporting cylinder, and the electromagnetic blocks in the two-thirds of the abc area that are normally energized are used to adsorb the iron in the raw material, and the normally closed switch on the circuit in the ad area with interval electricity is turned on or off, so that the normally closed switch on the circuit of the electromagnetic block in the ad area that adsorbs the iron is disconnected, the electromagnetic block in the ad area is demagnetized, the iron falls off the electromagnetic block and separates into the iron storage area, and the electromagnetic block leaving the ad area is powered on again for rapid magnetization, and such a cycle can form large-scale iron removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a main cross-sectional structural schematic diagram of the present invention, Figure 2 yes Figure 1 AA cross-sectional structure diagram in the figure, Figure 3 yes Figure 2 A magnified schematic diagram of the local structure of XX Figure 4 This is a schematic diagram of the structure in which electromagnetic blocks in the abcd regions of the present invention are connected in series. Figure 5 This is a schematic diagram of the structure in which the electromagnetic blocks in the ad region of the present invention are connected in series. Figure 6 Schematic diagram of the end surface structure of the iron removal roller of the present invention. Figure 7 yes Figure 6 Schematic diagram of the B-direction structure, Figure 8 It is a schematic diagram of the cross-sectional structure of the raw material distributor of the present invention.

[0011] In the figure, 1, raw material input belt 2, crushing and iron removal roller 3, raw material feeding pipe 4, raw material distributor 5, outer cylinder 6, pressing block 7, electromagnetic block 8, support plate 9, wire 10, iron material outlet 11, iron material box 12, iron material discharge hopper 13, arc contact plate 14, raw material output belt 15, raw material discharge hopper 16, raw material outlet 17, roller body 18, magnetic strip 19, strong magnetic plate 20, comb teeth 21, primary rotating shaft 22, fastening screw Ⅰ 23, spoke 24, flange 25, bearing seat 26, end plate 27, rotating tube shaft 28, transmission key 29, rotating electrical connector 30, normally closed switch 31, partition 32, limit frame 33, support cylinder 34, fastening screw Ⅱ 35, raw material injection hole 36, magnetic ring 37, material guide trough 38, spring 39, normally open switch. DETAILED DESCRIPTION

[0012] Embodiment 1: Deironing of Shulan clay (iron oxide content 2.2-2.5%) produced in Jilin City, Jilin Province. A combined device for removing trace iron from ceramic raw materials, comprising a primary deironing body and a secondary deironing body, wherein the secondary deironing body comprises an outer cylinder 5 (the outer cylinder is connected to the support foot by a support plate 8), a raw material feed pipe 3 with one end located at the upper part of the outer cylinder and communicating with the inner cavity of the outer cylinder, a raw material discharge hopper 15 and an iron material discharge hopper 12 respectively connected to the lower end of the outer cylinder, and the two ends of the outer cylinder are fixedly connected to the end plates 26, a bearing seat 25 is provided in the middle of the end plates, and a rotating shaft 27 is movably provided between the bearing seats, and the right end of the rotating shaft extends out of the end plates and A rotating electrical connector 29 and a transmission key 28 are connected to the outside of the bearing seat. The rotating tube shaft is connected to a servo motor (not shown) through the transmission key. The outer cylinder is provided with a supporting cylinder 33 that can rotate counterclockwise through the rotating tube shaft. A raw material distributor 4 fixed on the inner wall of the outer cylinder is provided between the supporting cylinder and the raw material feed pipe. The raw material distributor is arc-shaped and has trumpet-shaped raw material injection holes 35 distributed in a grid shape at intervals thereon. The inner cavity of the outer cylinder is connected to the raw material feed pipe through the raw material injection holes. The surface of the support cylinder is fixed with electromagnetic blocks 7 having magnetic rings 36 on the magnetic surface at intervals by fastening screws II 34 (the magnetic rings can increase the adsorption force), and the electromagnetic blocks are separated by limit frame plates 32. The electromagnetic blocks are square (100-150×100-150 mm), and the electromagnetic blocks are divided into an abcd area with a central angle of 280° and an ad area with a central angle of 80° on the cross section of the support cylinder (the support cylinder is divided into four points a, b, c, and d on the circumference (ab, bc and cd form the abcd area; d and a form the ad area), and the electromagnetic blocks on the abcd area of ​​the support cylinder are connected by wires 9. The two groups of wires of the electromagnetic blocks in the abcd and ad regions are connected in series, and then pass through the rotating tube shaft 27 and are connected to the rotating electric connector 29 connected to the mains electricity installed on one end of the rotating shaft tube. A wedge-shaped pressing block 6 is arranged on the supporting cylinder at the relative position of point a in the ad region. An arc-shaped contact plate 13 is fixedly arranged on the end plate of the outer cylinder between the end point a and the end point d corresponding to the ad region. The two ends of the arc-shaped contact plate are supported and fixed on the inner wall of the outer cylinder by springs 38. When the pressing block rotates counterclockwise with the supporting cylinder, it contacts the arc-shaped contact plate at the end point a and is compressed to generate displacement (maximum displacement 1-1.5mm, which is the height of the inclined surface of the wedge-shaped pressure block), the arc contact plate at end point a is pressed and moves to squeeze the normally closed switch 30 at end point a to disconnect it. At this time, the electromagnetic block in area ad is powered off and demagnetized. When the pressure block is pressed and contacted with the arc contact plate from end point a to end point d, the electromagnet on the support cylinder from end point a to end point d is powered off, and the iron material adhering to the electromagnetic block in area ad falls off from the electromagnet and enters the iron material box through the iron material outlet; when the pressure block continues to rotate counterclockwise with the support cylinder until it contacts the arc contact plate at end point d and is pressed and displaced (pressure The arc contact plate at the end point a is completely removed from the arc contact plate, and the normally closed switch automatically returns to the closed state from the open state), the arc contact plate at the end point d is pressed and moves to squeeze the normally open switch 39 at the end point d to close it, at this time, the electromagnetic block in the ad area is charged and magnetized, and when the arc contact plate at the end point d of the pressing block continues to rotate counterclockwise with the supporting cylinder (the arc contact plate at the end point d of the pressing block is completely removed from the arc contact plate, and the normally open switch returns to the open state from the closed state), a partition plate 31 is provided between the raw material discharge port 16 and the iron material discharge port 10 provided at the lower end of the outer cylinder, so that the raw material and the iron material are separated. The raw materials are discharged from the raw material discharge hopper 15 and the iron material discharge hopper 12, and the raw materials flow into the raw material output belt 14 for output, and the iron materials flow into the iron material box 11. The primary iron removal body is arranged in the trumpet-shaped raw material feed pipe 3, and the primary iron removal body includes two relatively rotating crushing and iron removal rollers 2 vertically distributed above and below the end of the raw material input belt 1, and the crushing and iron removal rollers include a rotating drum body 17 connected to the primary rotating shaft 24 and capable of rotating, and the rotating drum body is connected to the primary rotating shaft 21 through the spokes 23 and the flange 24, and the primary rotating shaft is connected to the motor. Several rows of comb teeth 20 are arranged in staggered or parallel manner in the axial direction of the cylinder, and each row of comb teeth is arranged at intervals on the cross section. The angle (radial) between the comb teeth is (15-20°) and a strong magnetic plate 19 is fixed on the rotating cylinder by a fastening screw Ⅰ22. The comb teeth are spaced 30-50 mm apart in the axial direction, and the two sides of the comb teeth are pointed. The strong magnetic plate is spaced apart by magnetic strips 18. A raw material guide groove 37 is arranged between the raw material input belt 1 and the crushing and iron removal roller 2. The guide groove can make all the raw materials coming down from the raw material input belt be sent between the two crushing and iron removal rollers. The above embodiment was measured and sampled 5 times (average iron content Fe2O3 of 0.81, 1.02, 0.92, 1.05 and 1.09) on 10 tons of Shulan clay working for 3 hours, and the result was 0.98%, which met the requirements of excellent clay grade. .

[0013] Example 2: Iron removal was carried out in the quartz sand mineral from Gong County, Henan Province (iron oxide content 0.6-1%). The combined device described in Example 1 was used to appropriately support the cylinder and adjust the rotation speed to 30-40 rpm). After working for 2 hours, 5 tons of Gong County quartz sand was measured and sampled 3 times (0.102, 0.17 and 0.11). The average iron content (Fe2O3) was 0.126%, reaching the grade requirement between first-class and second-class products.

[0014] Example 3: Similarly, after working for 2 hours, 5 tons of Kaifeng bauxite (iron oxide content 1.0-1.5%) were tested for iron removal three times (0.102, 0.17 and 0.11 average iron content Fe2O3) and the result was 0.38.1%, which was close to the grade requirement of second-class product.

Claims

1. A combined device for removing trace iron from ceramic raw materials, characterized by: It comprises a primary iron removal and a secondary iron removal body, wherein the secondary iron removal body comprises an outer cylinder (5), a raw material feed pipe (3) with one end located at the upper part of the outer cylinder and communicating with the inner cavity of the outer cylinder, a raw material discharge hopper (15) and an iron material discharge hopper (12) respectively connected to the lower end of the outer cylinder, the outer cylinder is provided with a support cylinder (33) which can rotate counterclockwise driven by a rotating tube shaft (27), a raw material distributor (4) fixed on the inner wall of the outer cylinder is provided between the support cylinder and the raw material feed pipe, the raw material distributor is in an arc shape and has raw material injection holes (35) distributed in a grid shape at intervals, and the surface of the support cylinder is fixedly provided with There is an electromagnetic block (7), which is divided into an abcd area with a central angle of 280 degrees and an ad area with a central angle of 80 degrees on the cross section of the support cylinder. The electromagnetic blocks in the abcd area of ​​the support cylinder are connected in series with each other by wires (9), and the ad area is connected in series with each other by wires. The electromagnetic blocks in the abcd area and the ad area are connected in parallel and then pass through a rotating shaft tube to be connected to a rotating electrical connector (29) mounted on one end of the rotating shaft tube. A wedge-shaped pressing block (6) is arranged on the support cylinder at a position opposite to point a in the ad area, and is fixedly arranged on the end plate of the outer cylinder between the a end point and the d end point corresponding to the ad area. There is an arc-shaped contact plate (13). When the pressing block rotates counterclockwise with the supporting cylinder body and contacts the arc-shaped contact plate at the end point a and is pressed and displaced, the arc-shaped contact plate is pressed and moved to squeeze the normally closed switch to make it disconnected. At this time, the electromagnetic block in the ad area is powered off and demagnetized. The iron material adhered to the electromagnetic block in the ad area falls off the electromagnet and enters the iron material box (11) through the iron material outlet (10); when the pressing block continues to rotate counterclockwise with the supporting cylinder body and contacts the arc-shaped contact plate at the end point d and is pressed and displaced, the arc-shaped contact plate at the end point d is pressed and moved to squeeze the normally open switch to make it closed. At this time, the electromagnetic block in the ad area is charged and magnetized. The lower end of the outer cylinder is provided with a A partition (31) is provided for separating the raw material discharge hopper and the iron material discharge hopper; the first-level iron removal body is arranged in the raw material feed pipe, the first-level iron removal body comprises two relatively rotating crushing iron removal rollers (2) vertically distributed above and below the raw material input belt (1); the crushing iron removal rollers comprise a rotatable drum body (17); a plurality of rows of comb teeth (20) are arranged alternately or in parallel on the drum body, and each row of comb teeth are arranged at intervals on the cross section; a strong magnetic plate (19) is fixedly arranged on the drum body between the comb teeth, and magnetic strips (18) are arranged at intervals on the strong magnetic plate; a raw material guide trough (37) is provided between the raw material input belt and the crushing iron removal rollers.

2. The combined device for removing trace iron from ceramic raw materials according to claim 1, characterized in that: The raw material injection hole (35) is trumpet-shaped.

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