A system for separating non-ferrous metal oxides from red mud

Abstract

The utility model discloses a kind of separation systems of nonferrous metal oxide in red mud, including import and export sequentially cascaded magnetic separation equipment, storage tank and pickling equipment;Wherein magnetic separation equipment includes warehouse body, permanent magnet drum, belt roller and conveying device, permanent magnet drum and belt roller are all installed in warehouse body, pass through belt drive, the tangent of top end of belt roller and permanent magnet drum is horizontal line;The bottom of warehouse body is processed with the arc bottom wall of permanent magnet drum coaxial;Annular material passage of equal interval is formed between arc bottom wall and permanent magnet drum;Annular material passage entrance side is connected with feeding hopper through obliquely upward feeding channel, outlet side is connected with downward tapping hole;Conveying device is transversely installed below belt roller, and its outlet extends to outside warehouse body.The utility model removes ferromagnetic oxide in advance, then pickling is carried out again, can greatly reduce the dosage of acid, improve magnetic separation equipment, more conducive to ferromagnetic oxide fully adsorbed on the surface of belt roller.

Description

Technical Field

[0001] This utility model relates to the field of red mud recycling equipment, and in particular to a separation system for non-ferrous metal oxides in red mud. Background Technology

[0002] Red mud is an industrial waste generated during alumina production. It contains abundant non-ferrous metal oxides, and recovering valuable metals such as scandium, gallium, and yttrium from it is of significant economic value. Acid leaching is commonly used to dissolve and recover these oxides. However, red mud also contains a considerable amount of ferromagnetic oxides, such as ferric oxide or magnetite, which react with acids, but this method is not economically viable. Currently, magnetic separation equipment is mainly used for removal. However, roller-type magnetic separators slide downwards from the top of the magnetic roller, resulting in short contact time and rapid descent, leading to a lower recovery rate. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a separation system for non-ferrous metal oxides in red mud, so as to solve the technical problems in the background art mentioned above.

[0004] The technical solution of this utility model is as follows:

[0005] A separation system for non-ferrous metal oxides in red mud includes a magnetic separator, a storage tank, and an acid washing device connected in series at the inlet and outlet. The magnetic separator includes a silo, a permanent magnet drum, a belt roller, and a conveying device. The permanent magnet drum and the belt roller are both installed inside the silo and are connected to a power unit via belt drive. The top tangents of the belt roller and the permanent magnet drum are horizontal. The bottom of the silo is machined with an arc-shaped bottom wall coaxial with the permanent magnet drum. An equally spaced annular material channels are formed between the arc-shaped bottom wall and the permanent magnet drum. The inlet side of the annular material channel is connected to a feed hopper via an upwardly inclined feed channel, and the outlet side is connected to a downwardly slag outlet. The conveying device is installed horizontally below the belt roller, and its outlet extends outside the silo.

[0006] Furthermore, the bottom of the feed channel is tangentially connected to the arc-shaped bottom wall.

[0007] Furthermore, the upper wall of the feed channel extends close to the conveyor belt.

[0008] Furthermore, the outlet of the pickling equipment is connected to a filter box, the bottom of which is connected to the top of the pickling equipment via a circulation pipe with a circulation pump.

[0009] Furthermore, a spray head is installed above the filter box, and the spray head is connected to the bottom of the water tank through a spray pipe. A water pump is installed at the inlet of the spray pipe.

[0010] Furthermore, a pH monitor is installed on the circulation pipe, and an acid addition pipe is installed above the pickling equipment.

[0011] The advantages of this utility model are:

[0012] The advantages of this invention are as follows: This invention removes ferromagnetic oxides in advance through magnetic separation equipment, and then transports the red mud to the pickling equipment for pickling, which can significantly reduce the amount of acid used. In order to enhance the removal rate of ferromagnetic oxides, this invention has improved the magnetic separation equipment. After the red mud enters the inlet of the annular material channel from the feed channel, it will be carried into the annular material channel by the friction of the belt. It will continuously rub upward in the annular material channel, with the inner and outer layers interacting. Compared with the method of rolling downward from the top, it is more conducive to the full adsorption of ferromagnetic oxides on the surface of the belt roller. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 3D schematic diagram of magnetic separator Figure 1 ;

[0015] Figure 3 3D schematic diagram of magnetic separator Figure 2 ;

[0016] Figure 4 This is a cross-sectional view of a magnetic separator.

[0017] In the diagram: 1-Magnetic separator, 11-Seal body, 111-Circular bottom wall, 12-Permanent magnet drum, 13-Belt roller, 131-Belt, 14-Conveying device, 15-Annular material channel, 16-Feeding channel, 17-Feeding hopper, 18-Slag outlet, 19-Power unit, 2-Storage tank, 3-Pickling equipment, 31-Acid adding pipe, 4-Filter box, 41-Circulating pump, 42-pH monitor, 43-Circulating pipe, 5-Water tank, 51-Water pump, 52-Spray pipe, 53-Spray head. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0019] like Figure 1-4 As shown:

[0020] A separation system for non-ferrous metal oxides in red mud includes a magnetic separator 1, a storage tank 2, and an acid washing device 3 connected in series at the inlet and outlet. The magnetic separator 1 includes a bin 11, a permanent magnet drum 12, a belt roller 13, and a conveying device 14. The permanent magnet drum 12 and the belt roller 13 are both installed inside the bin 11 and driven by a belt 131. The permanent magnet drum 12 or the belt roller 13 is connected to a power unit 19. The top tangent of the belt roller 13 and the permanent magnet drum 12 is horizontal. The bottom of the bin 11 is machined with an arc-shaped bottom wall 11 coaxial with the permanent magnet drum 12. An equally spaced annular material channels 15 are formed between the arc-shaped bottom wall 11 and the permanent magnet drum 12. The inlet side of the annular material channel 15 is connected to the feed hopper 17 through an upwardly inclined feed channel 16, and the outlet side is connected to the downwardly downward slag outlet 18. The conveying device 14 is installed horizontally below the belt roller 13, and its outlet extends outside the bin 11.

[0021] The advantages of this invention are as follows: This invention removes ferromagnetic oxides beforehand using magnetic separation equipment 1, and then transports the red mud to pickling equipment 3 for pickling, which significantly reduces the amount of acid used. To enhance the removal rate of ferromagnetic oxides, this invention improves magnetic separation equipment 1. After the red mud enters the inlet of the annular material channel 15 from the feed channel 16, it is carried into the annular material channel 15 by the friction of the belt. Within the annular material channel 15, it continuously rubs upwards, with the inner and outer layers interacting. Compared to rolling downwards from the top, this method is more conducive to the full adsorption of ferromagnetic oxides onto the surface of the belt roller 13. When the red mud with ferromagnetic oxides removed reaches the end of the annular material channel 15, it loses its restraint and is discharged from the slag outlet 18. The ferromagnetic oxides adsorbed on the belt 131 move to the top with the belt, then move away from the permanent magnet drum 12 and return to a free state. After reaching the belt roller 13, they fall to the conveyor 14 and are transported outside the bin 11.

[0022] As an improvement, the bottom of the feed channel 16 is tangentially connected to the arc-shaped bottom wall 11, which makes the feeding smoother. At the same time, the upper wall of the feed channel 16 extends close to the belt, which can better guide the flow.

[0023] To ensure full recovery of non-ferrous metal oxides, excess acid is used. The outlet of the pickling equipment 3 is then connected to the filter box 4. The bottom of the filter box 4 is connected to the top of the pickling equipment 3 via a circulation pipe 43 equipped with a circulation pump 41. The acid solution is recycled each time, and an appropriate amount of concentrated acid is added after each pickling to maintain a high concentration. To increase the acid recovery rate, a spray head 53 is installed on top of the filter box 4. The spray head 53 is connected to the bottom of the water tank 5 via a spray pipe 52. A water pump 51 is installed at the inlet of the spray pipe 52. After each filtration, clean water is sprayed to dissolve and clean the residual acid in the red mud and to replenish the consumed water.

[0024] To facilitate the addition of concentrated acid, a pH monitor 42 can be installed on the circulation pipe 43, and an acid addition pipe 31 is also installed above the pickling equipment 3. The amount of acid added is determined according to the pH value of the residual acid. After 3-5 cycles, the pickling solution is discharged and collected. It contains a high concentration of non-ferrous metal ions or elements, which facilitates centralized recovery and treatment.

[0025] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A separation system for non-ferrous metal oxides in red mud, characterized in that: The system includes a magnetic separator, a storage tank, and a pickling device connected in series with their inlets and outlets. The magnetic separator consists of a silo, a permanent magnet drum, a belt roller, and a conveyor. The permanent magnet drum and the belt roller are both installed inside the silo and are connected to a power unit via belt drive. The top tangents of the belt roller and the permanent magnet drum are horizontal. The bottom of the silo is machined with an arc-shaped bottom wall coaxial with the permanent magnet drum. An equally spaced annular material channel is formed between the arc-shaped bottom wall and the permanent magnet drum. The inlet side of the annular material channel is connected to the feed hopper via an upwardly angled feed channel, and the outlet side is connected to the downwardly facing slag outlet. The conveyor is installed horizontally below the belt roller, and its outlet extends outside the silo.

2. The separation system for non-ferrous metal oxides in red mud according to claim 1, characterized in that: The bottom of the feeding channel is tangentially connected to the arc-shaped bottom wall.

3. The separation system for non-ferrous metal oxides in red mud according to claim 2, characterized in that: The upper wall of the feed channel extends close to the conveyor belt.

4. The separation system for non-ferrous metal oxides in red mud according to claim 1, characterized in that: The outlet of the pickling equipment is connected to a filter box, and the bottom of the filter box is connected to the top of the pickling equipment via a circulation pipe with a circulation pump.

5. The separation system for non-ferrous metal oxides in red mud according to claim 4, characterized in that: A spray head is installed above the filter box. The spray head is connected to the bottom of the water tank through a spray pipe. A water pump is installed at the inlet of the spray pipe.

6. The separation system for non-ferrous metal oxides in red mud according to claim 5, characterized in that: A pH monitor is installed on the circulation pipe, and an acid addition pipe is also installed above the pickling equipment.

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