An air film drum magnetic separator

Abstract

The present invention provides an air film type drum magnetic separator, comprising a feed box, a sorting trough, a permanent magnetic sorting drum and its rotating shaft, a driving motor, a concentrate box and its concentrate box discharge pipe, a tailings box and a control box of the drum magnetic separator, characterized in that a field strength adjustment mechanism is provided on the permanent magnetic sorting drum and its rotating shaft, and a concentrate grade detection mechanism is provided on the concentrate box and its concentrate discharge pipe; the field strength adjustment mechanism comprises a rotating shaft, an air source, an air inlet pipe, an air discharge pipe and an air film; the concentrate grade detection mechanism comprises an agitator, a water supply pipe, a concentration meter, a sampler and an automatic grade meter. The present invention has the advantages that the field strength of the drum magnetic separator can be adjusted to increase or decrease according to the fluctuation of the concentrate product grade, thereby achieving the purpose of controlling the concentrate product grade of the drum magnetic separator to be stable between 65% and 69%.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetic separation in ore dressing plants, and in particular relates to an air film drum magnetic separator. Background Art

[0002] At present, since most iron ore species have a certain degree of magnetism, magnetic separation is the main method for beneficiation of iron ore. Strong magnetic minerals such as magnetite and titanomagnetite are mostly separated by drum magnetic separators, while weak magnetic minerals such as hematite, limonite, and specularite are mostly separated by vertical ring strong magnetic separators and flat ring strong magnetic separators.

[0003] Magnetite is the iron ore with the largest reserves and the most widely used. Due to its strong magnetism, magnetite can be sorted and recovered through a drum magnetic separator with a smaller magnetic field intensity.

[0004] For iron mines, due to the large fluctuations in the properties of their ore and the fact that the service life of a general mine is at least 20 years and at most 40 to 50 years, the grade of magnetite processed during its service life fluctuates greatly, which leads to large fluctuations in the grade and yield of its iron concentrate products. The current drum magnetic separator for magnetite uses a permanent magnetic system with a fixed field strength that cannot be adjusted. Therefore, when the ore feed fluctuates, the product fluctuates greatly, and the ideal product index is often not obtained, thereby reducing the profitability of the concentrator. Summary of the invention

[0005] The purpose of the present invention is to provide an air film drum magnetic separator which can adapt to the fluctuation of feed grade, can effectively adjust the field strength of the drum magnetic separator, and can also automatically and accurately control product indicators.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] The present invention provides an air film type drum magnetic separator, comprising a feed box, a sorting trough, a permanent magnetic sorting drum and a rotating shaft thereof, a driving motor, a concentrate box and a concentrate box discharge pipe, a tailings box and a control box of the drum magnetic separator, wherein the concentrate box is connected to a concentrate discharge port at the unloading end of the sorting trough, and the tailings box is connected to a tailings discharge port at the bottom of the sorting trough, and is characterized in that a field strength adjustment mechanism is provided on the permanent magnetic sorting drum and its rotating shaft, and a concentrate grade detection mechanism is provided on the concentrate box and its concentrate discharge pipe;

[0008] The field intensity adjustment mechanism comprises an air source, an air inlet pipe, an air outlet pipe and an air film; the air film is a cylindrical air film, and a hollow end tube is provided in the center of both end surfaces of the cylindrical air film, the cylindrical air film gap is sleeved and covered on the surface of the permanent magnetic separation cylinder and its end surface, the front end of the hollow end tube is fixedly connected to the outer shell of the sealing rotating bearing ring fixed on the rotating shaft, and a closed space is formed between the cylindrical air film and the permanent magnetic separation cylinder.

[0009] A hollow hole is horizontally penetrated at the radial center of the rotating shaft, an air intake pipe is arranged in the hollow hole, one end of the air intake pipe is sleeved and inserted into the hollow hole, and the other end is connected to the air source, an air discharge pipe is arranged on the air intake pipe, and an electric regulating valve I and an electric regulating valve II are respectively arranged on the air intake pipe and the air discharge pipe, and the electric regulating valve I and the electric regulating valve II are both electrically connected to the control box;

[0010] An air outlet is provided on one side of the rotating shaft close to the permanent magnetic separation cylinder. One end of the air outlet is connected to the air inlet pipe, and the other end is connected to the hollow end tube of the cylindrical air film for inflating the air film.

[0011] The concentrate grade detection mechanism includes a concentrate box and its concentrate box discharge pipe, an agitator arranged in the concentrate box, a supplementary water pipe arranged on the concentrate box, a concentration meter arranged on the concentrate discharge pipe, a sampler and an automatic grader; the automatic grader is connected to the sampler through the sampler's sample tube, an electric regulating valve III is provided on the supplementary water pipe, there are two agitators, which are evenly distributed in the concentrate box along the length direction of the concentrate box; the agitator, automatic grader, concentration meter and electric regulating valve III are all electrically connected to the control box.

[0012] Furthermore, the cylindrical air membrane is made of flexible rubber and has a thickness of 5 mm to 15 mm.

[0013] Furthermore, disc-shaped clamping plates with a diameter 1.1 to 1.2 times the diameter of the permanent magnetic separation cylinder are respectively provided on the two hollow end tubes at both ends of the cylindrical air film, and the distance between the disc-shaped clamping plate and the end surface of the cylindrical air film is 50 mm to 100 mm.

[0014] Furthermore, the electric regulating valve I of the air intake pipe and the electric regulating valve II of the air discharge pipe are interlocked, and inflation or deflation is performed in equal steps, with the step spacing being 30 seconds to 60 seconds for each inflation or deflation, and the interval time being 5 minutes to 10 minutes.

[0015] Advantages of the present invention:

[0016] The present invention uses an air film to cover the outer ring of the permanent magnetic separation barrel, increases the distance between the air film surface and the permanent magnetic separation barrel surface by inflating the air film, and uses the air film surface as a new permanent magnetic separation barrel separation surface. This method utilizes the principle that the magnetic field intensity decreases with increasing distance on the surface of the permanent magnetic separation barrel, and adjusts the field intensity on the air film surface by controlling the distance between the air film and the surface of the permanent magnetic separation barrel, thereby achieving controllable field intensity of the separation interface, thereby utilizing different field intensities to obtain different iron concentrate indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 for Figure 1 AA view.

[0019] Figure 3 for Figure 1 BB direction view. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings.

[0021] like Figure 1 to Figure 3 As shown, an air film type drum magnetic separator of the present invention comprises a feed box 1, a sorting trough 2, a permanent magnetic sorting drum 3 and its rotating shaft 9, a drive motor 10, a concentrate box 4 and its concentrate box discharge pipe 25, a tailings box 5 and a control box of the drum magnetic separator, wherein the concentrate box 4 is connected to the concentrate discharge port at the unloading end of the sorting trough 2, and the tailings box 5 is connected to the tailings discharge port at the bottom of the sorting trough 2, and is characterized in that a field strength adjustment mechanism is provided on the permanent magnetic sorting drum 3 and its rotating shaft 9, and a concentrate grade detection mechanism is provided on the concentrate box 4 and its concentrate discharge pipe 25;

[0022] The field strength adjustment mechanism includes an air source 12, an air inlet pipe 6, an air discharge pipe 7 and an air film; the air film is a cylindrical air film 8, and a hollow end tube 15 is provided in the center of the two end surfaces of the cylindrical air film 8, the cylindrical air film 8 is gap-fitted and covers the surface and end surface of the permanent magnetic separation cylinder 3, the front end of the hollow end tube 15 is fixedly connected to the outer shell of the sealing rotating bearing ring 16 fixed on the rotating shaft 9, and a closed space is formed between the cylindrical air film 8 and the permanent magnetic separation cylinder 3, and the cylindrical air film 8 is made of flexible rubber with a thickness of 5mm to 15mm.

[0023] A hollow hole 11 is horizontally penetrated in the radial center of the rotating shaft 9, and an air intake pipe 6 is arranged in the hollow hole 11. One end of the air intake pipe 6 is inserted into the hollow hole 11, and the other end is connected to the air source 12. An air discharge pipe 7 is arranged on the air intake pipe 6. An electric regulating valve I 13 and an electric regulating valve II 14 are respectively arranged on the air intake pipe 6 and the air discharge pipe 7. The electric regulating valve I 13 and the electric regulating valve II 14 are both electrically connected to the control box.

[0024] An air outlet 18 is provided on the rotating shaft 9 near the permanent magnetic separation drum 3. One end of the air outlet 18 is connected to the air inlet pipe 6, and the other end is connected to the hollow end tube 15 of the cylindrical air film 8 for inflating the air film.

[0025] The concentrate grade detection mechanism includes a concentrate box 4 and its concentrate box discharge pipe 25, an agitator 19 arranged in the concentrate box 4, a supplementary water pipe 20 arranged on the concentrate box 4, a concentration meter 24 arranged on the concentrate discharge pipe 25, a sampler 21 and an automatic grader 22; the automatic grader 22 is connected to the sampler 21 through the sampler's sample tube, an electric regulating valve III 23 is arranged on the supplementary water pipe 20, there are two agitators 19, which are evenly distributed in the concentrate box along the length direction of the concentrate box 4; the agitator 19, the automatic grader 22, the concentration meter 24 and the electric regulating valve III 23 are all electrically connected to the control box. The present invention arranges the agitator 19 in the concentrate box 4, and the detection signal of the concentration meter 24 is automatically interlocked with the electric regulating valve III 23 of the supplementary water pipe 20. The detection signal of the automatic grader 22 is automatically interlocked with the electric regulating valve I13 on the air inlet pipe 6 and the electric regulating valve II14 on the air discharge pipe 7, achieving a homogeneous distribution of the material in the concentrate box 4, thereby ensuring the accuracy of the concentrate grade measurement.

[0026] The sampler 21 is arranged in front of the automatic grader 22 of the present invention, thereby ensuring the representativeness of the material fed by the automatic grader 22 and guaranteeing the accuracy of the grade measurement.

[0027] The electric regulating valve I13 of the air inlet pipe 6 and the electric regulating valve II14 of the air discharge pipe 7 of the present invention are interlocked, and equal steps of inflation or deflation are adopted, and the step spacing is 30 seconds to 60 seconds for each inflation or deflation, and the interval time is 5 minutes to 10 minutes. The spacing between the cylindrical air film 8 and the surface of the permanent magnetic separation cylinder 3 of the present invention is controlled by equal steps. This method ensures that under a certain surface field strength of the covering circle, the grade detection has a certain buffer time, and ensures that the result of the automatic grader 22 detection is the detection result when the iron concentrate flows to the automatic grader 22 under a specific field strength, thereby ensuring the validity of the detection result.

[0028] The present invention realizes precise control of product grade between 65% and 69% by interlocking the electric regulating valve I13 and the electric regulating valve II14 on the air inlet pipe 6 and the exhaust pipe 7 with the automatic grade meter 22. This avoids the influence of too low grade on sales and selling price when the product grade is lower than 65%; and also avoids the influence of too little silicon content in the product on the fluidity of blast furnace ironmaking slag when the product grade is higher than 69%, thereby adversely affecting the selling price and market of the product.

[0029] In addition, the present invention provides disc-shaped clamping plates 17 with a diameter 1.1 to 1.2 times the diameter of the permanent magnetic separation cylinder 3 on the two hollow end tubes 15 at both ends of the cylindrical air film 8, and the distance between the disc-shaped clamping plates 17 and the end surface of the cylindrical air film 8 is 50 mm to 100 mm.

[0030] The cylindrical air film 8 of the present invention is provided with disc-shaped clamping plates 17 at both ends, whose diameter is 1.1 to 1.2 times the diameter of the permanent magnetic separation cylinder 3. The setting of the disc-shaped clamping plates 17 limits the ineffective extension of the cylindrical air film 8 on both sides and prevents the shaking of the cylindrical air film 8, thereby ensuring the structural stability of the cylindrical air film 8 and creating conditions for good sorting.

[0031] The present invention is provided with high-grade and low-grade alarms in the automatic grader 22. When the detected grade of the automatic grader 22 is higher than 69%, the electric regulating valve II14 of the venting pipe 7 is automatically interlocked to open, thereby reducing the amount of air in the cylindrical air film 8 and reducing the distance between the cylindrical air film 8 and the surface of the permanent magnetic separation cylinder 3, thereby increasing the field strength on the surface of the cylindrical air film 8 and increasing the thickness of the concentrate adsorbed on the surface of the cylindrical air film 8, thereby increasing the amount of concentrate, and then reducing the grade of the concentrate and increasing the concentrate recovery rate until the alarm is lifted and the electric regulating valve II14 of the venting pipe 7 is automatically closed. When the detected grade of the automatic grader 22 is lower than 65%, the automatic interlock opens the electric regulating valve Ⅰ13 on the air inlet pipe 6 to start air intake, increasing the distance between the cylindrical air film 8 and the surface of the permanent magnetic separation cylinder 3, thereby reducing the field strength on the surface of the air film 8 and reducing the thickness of the concentrate adsorbed on the surface of the air film 8, thereby reducing the amount of concentrate, and then increasing the grade of the concentrate and reducing the concentrate recovery rate until the alarm is lifted and the electric regulating valve Ⅰ13 of the air inlet pipe 6 is automatically closed.

[0032] The concentration meter 24 on the concentrate box discharge pipe 25 is also equipped with high concentration and low concentration alarms. When the concentration detected by the concentration meter 24 is lower than 45%, the electric regulating valve III 23 on the automatic interlocking water supply pipe 20 reduces the valve opening, thereby increasing the concentration of the concentrate until the alarm is lifted. When the concentration detected by the concentration meter 24 is higher than 60%, the electric regulating valve III 23 on the automatic interlocking water supply pipe 20 increases the valve opening, thereby reducing the concentration of the concentrate until the alarm is lifted.

[0033] The concentration meter, the driving motors of all valves, and the detection signals of the automatic grader 22 are all connected to the control box and automatically operated. This method can not only detect and control in real time, but also does not require manual operation, saving labor costs.

Claims

1. An air film type drum magnetic separator, comprising a feed box, a sorting trough, a permanent magnetic sorting drum and its rotating shaft, a drive motor, a concentrate box and its concentrate box discharge pipe, a tailings box and a control box of the drum magnetic separator, wherein the concentrate box is connected to the concentrate discharge port at the unloading end of the sorting trough, and the tailings box is connected to the tailings discharge port at the bottom of the sorting trough, characterized in that: A field strength adjustment mechanism is provided on the permanent magnetic separation drum and its rotating shaft, and a concentrate grade detection mechanism is provided on the concentrate box and its concentrate discharge pipe; The field intensity adjustment mechanism comprises an air source, an air inlet pipe, an air outlet pipe and an air film; the air film is a cylindrical air film, and a hollow end tube is provided in the center of both end surfaces of the cylindrical air film, the cylindrical air film gap is sleeved and covered on the surface of the permanent magnetic separation cylinder and its end surface, the front end of the hollow end tube is fixedly connected to the outer shell of the sealing rotating bearing ring fixed on the rotating shaft, and a closed space is formed between the cylindrical air film and the permanent magnetic separation cylinder. The two hollow end tubes at both ends of the cylindrical air film are respectively provided with disc-shaped clamping plates with a diameter 1.1 to 1.2 times the diameter of the permanent magnetic separation cylinder, and the distance between the disc-shaped clamping plate and the end surface of the cylindrical air film is 50 mm to 100 mm; A hollow hole is horizontally penetrated at the radial center of the rotating shaft, an air intake pipe is arranged in the hollow hole, one end of the air intake pipe is sleeved and inserted into the hollow hole, and the other end is connected to the air source, an air discharge pipe is arranged on the air intake pipe, an electric regulating valve I and an electric regulating valve II are arranged on the air intake pipe and the air discharge pipe respectively, the electric regulating valve I and the electric regulating valve II are electrically connected to the control box, the electric regulating valve I of the air intake pipe and the electric regulating valve II of the air discharge pipe are interlocked, and equal steps of inflation or deflation are adopted, the step spacing is 30 seconds to 60 seconds for each inflation or deflation, and the interval time is 5 minutes to 10 minutes; An air outlet is provided on the rotating shaft near the permanent magnetic separation cylinder, one end of the air outlet is connected to the air inlet pipe, and the other end is connected to the hollow end tube of the cylindrical air film, which is used to inflate the air film; The concentrate grade detection mechanism includes a concentrate box and its concentrate box discharge pipe, an agitator arranged in the concentrate box, a supplementary water pipe arranged on the concentrate box, a concentration meter arranged on the concentrate discharge pipe, a sampler and an automatic grader; the automatic grader is connected to the sampler through the sampler's sample tube, an electric regulating valve III is provided on the supplementary water pipe, there are two agitators, which are evenly distributed in the concentrate box along the length direction of the concentrate box, and the agitator, automatic grader, concentration meter and electric regulating valve III are all electrically connected to the control box.

2. The air film drum magnetic separator according to claim 1, characterized in that: The cylindrical air film is made of flexible rubber and has a thickness of 5 mm to 15 mm.

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