Acid leaching device for silica fume purification

Abstract

The utility model relates to the technical field of silicon ore purification production, and discloses an acid leaching device for silica fume purification, which comprises an open barrel and a support, the support is used for erecting the barrel on the ground, a barrel cover is screwed on the barrel, a discharge pipe and a drain pipe are arranged at the bottom of the barrel, a filter screen is arranged at the orifice of the drain pipe, and the filter screen is arranged on the support. A liquid inlet pipe is arranged at the position, away from the discharging pipe, of the barrel, a plurality of gas ejectors are evenly distributed in the barrel, a pressure release valve and a gas overflow port are installed on the barrel cover, an acid gas filtering layer is arranged on the gas overflow port, and the gas ejectors are arranged in the barrel. The acid leaching device has the beneficial effects that mechanical stirring is replaced by bubbles blown by the gas ejector, so that the mixing degree of acid leaching liquid and silica fume in the barrel body can be increased, the contact area of materials and the solution is increased, the acid leaching speed is improved, meanwhile, mutual friction between a mechanical stirring mechanism and the materials is avoided, and the properties of the mixed materials are kept.

Description

Technical Field

[0001] The utility model relates to the technical field of silicon ore purification production, in particular to an acid leaching device for purifying silicon ash. Background Art

[0002] Silica ash is the smoke and dust that escapes with the exhaust gas during the high-temperature smelting of industrial silicon and ferrosilicon in industrial electric furnaces, which is collected and processed by special capture devices. The main component of silica ash is extremely fine SiO2, and it also contains some other components, such as K2O, MgO, Al2O3, CaO, Fe2O3, etc. As an inevitable by-product in the smelting process of industrial silicon and ferrosilicon, silica ash is mostly sold at a low price or stored in a pile, which will cause a waste of resources. A large amount of silica ash requires a large amount of land for stacking. This not only wastes precious land resources, but also because the silica ash particles are extremely fine, they may enter the human body through the air, water or food chain, thereby causing respiratory diseases, skin diseases, etc. The main component of silica ash is extremely fine SiO2, with huge potential resources and high recycling value.

[0003] The Chinese utility model patent (authorization announcement number: CN203568861U, name: acid leaching device for silicon material) is provided with a jacket through which the medium can pass on the outside of the acid leaching barrel body, which is suitable for hot acid leaching and shortens the processing time; the provided stirring device is of split design, which reduces the installation and maintenance costs of the acid leaching device; the provided acid gas escape port is provided with an acid gas filter layer to treat the acid gasification generated during hot acid leaching and reduce the harm of acid gas to the human body and the environment, but the mechanical stirring mechanism it adopts needs regular maintenance and maintenance, and the corresponding maintenance cost is high; at the same time, the mechanical stirring mechanism will rub against the material during the stirring process, which will affect the properties of the mixed material. Utility Model Content

[0004] The utility model aims to provide an acid leaching device for purifying silica ash to overcome the shortcomings of the prior art.

[0005] The purpose of the utility model is achieved through the following technical solutions: an acid leaching device for purifying silica ash, comprising an open cylinder and a bracket, the bracket is used to erect the cylinder on the ground, a cylinder cover is screwed on the cylinder, a discharge pipe and a liquid discharge pipe are arranged at the bottom of the cylinder, a filter screen is arranged at the pipe mouth of the liquid discharge pipe, a liquid inlet pipe is arranged at the cylinder away from the discharge pipe, the opening and closing of the discharge pipe, the opening and closing of the liquid discharge pipe and the opening and closing of the liquid inlet pipe are all controlled by a valve, an air supply pipe is fixed near the discharge pipe in the cylinder, the air supply pipe is circumferentially arranged around the inside of the cylinder and the air inlet end is located outside the cylinder, a plurality of branch pipes are evenly distributed on the air supply pipe, the branch pipes are located in the cylinder and extend toward the cylinder cover, a plurality of gas injectors are evenly distributed on the branch pipes along the extension direction thereof, a pressure relief valve and a gas overflow port are installed on the cylinder cover, and an acid gas filter layer is arranged on the gas overflow port.

[0006] Preferably, a screw conveyor is further included, the end of the discharge pipe is connected to the feed port of the screw conveyor, and the feed port of the screw conveyor is located below the discharge port.

[0007] Preferably, a steel pipe is fixed on the discharge port of the screw conveyor, and the steel pipe extends toward the barrel cover. A screw is fixed in the steel pipe along its axial direction, and an extrusion plate and a spring are sleeved on the screw. A nut is also screwed on the screw, and the spring is compressed and installed between the extrusion plate and the nut.

[0008] Preferably, the end face of the discharge end of the steel pipe is an inclined surface, and an arc-shaped material guide plate is fixed at the lowest point of the inclined end face, and the material guide plate extends along the inclined surface.

[0009] Preferably, casters are provided at the bottom of the bracket.

[0010] Preferably, a crossbeam is fixed on the bracket, a screw is screwed on the crossbeam, a disc is fixed on the end of the screw close to the ground, and the disc is pressed tightly against the ground by twisting the screw.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] A gas injector is arranged in the cylinder. The bubbles blown in by the gas injector replace the mechanical stirring, which can increase the mixing degree of the acid leaching solution and silica fume in the cylinder, increase the contact area between the material and the solution, and improve the acid leaching rate. At the same time, the friction between the mechanical stirring mechanism and the material is avoided, and the properties of the mixed material are maintained. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0014] Figure 2It is a cross-sectional schematic diagram of the utility model;

[0015] Figure 3 for Figure 2 A local enlarged schematic diagram of the middle A;

[0016] In the figure, 1-cylinder body, 2-cylinder cover, 3-liquid discharge pipe, 4-air supply pipe, 5-branch pipe, 6-pressure relief valve, 7-gas overflow port, 8-screw conveyor, 9-steel pipe, 10-screw, 11-extrusion plate, 12-spring, 13-nut, 14-guide plate, 15-castor, 16-crossbeam, 17-screw, 18-disc, 19-liquid inlet pipe. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0019] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0021] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] like Figure 1 and 2 As shown, an acid leaching device for purifying silica ash comprises an open cylinder 1 and a bracket, the bracket is used to set up the cylinder 1 on the ground, a cylinder cover 2 is screwed on the cylinder 1, a discharge pipe and a liquid discharge pipe 3 are arranged at the bottom of the cylinder 1, a filter screen is arranged at the mouth of the liquid discharge pipe 3, a liquid inlet pipe 19 is arranged at the cylinder 1 away from the discharge pipe, the opening and closing of the discharge pipe, the opening and closing of the liquid discharge pipe 3 and the opening and closing of the liquid inlet pipe 19 are all controlled by valves, an air supply pipe 4 is fixed near the discharge pipe in the cylinder 1, the air supply pipe 4 is arranged circumferentially around the inside of the cylinder 1 and the air inlet end is located outside the cylinder 1, and the air supply pipe 4 is provided with a filter screen at the mouth of the liquid discharge pipe 3. A plurality of branch pipes 5 are evenly distributed, the branch pipes 5 are located in the cylinder 1 and extend toward the cylinder cover 2, a plurality of gas injectors are evenly distributed on the branch pipes 5 along the extending direction thereof, a pressure relief valve 6 and a gas overflow port 7 are installed on the cylinder cover 2, an acid gas filter layer is arranged on the gas overflow port 7, a gas injector is arranged in the cylinder 1, and bubbles blown in by the gas injector replace mechanical stirring, which can increase the mixing degree of the acid leaching solution and the silica ash in the cylinder 1, increase the contact area between the material and the solution, and improve the acid leaching rate, while avoiding the friction between the mechanical stirring mechanism and the material, and maintaining the properties of the mixed material.

[0024] In this embodiment, if Figure 1 and 2As shown, it also includes a screw conveyor 8, the end of the discharge pipe is connected to the feed port of the screw conveyor 8, and the feed port of the screw conveyor 8 is located below the discharge port. Under the action of gravity, the acid bath in the solid material flows downward in the fixed material conveying direction, thereby achieving solid-liquid separation, so that the purified solid material maintains a certain degree of dryness, thereby shortening the subsequent drying process time and improving the drying process efficiency.

[0025] In this embodiment, if Figure 1 and 3 As shown, a steel pipe 9 is fixed on the discharge port of the screw conveyor 8, and the steel pipe 9 extends toward the barrel cover 2. A screw 10 is fixed in the steel pipe 9 along its axial direction (a cross bar is fixed in the steel pipe, and the screw is welded on the cross bar). An extrusion plate 11 and a spring 12 are sleeved on the screw 10. A nut 13 is also screwed on the screw 10. The spring 12 is compressed and installed between the extrusion plate 11 and the nut 13. The solid material after acid leaching is sent to the steel pipe 9 through the screw conveyor 8, and is squeezed dry under the action of the spring 12 and the extrusion plate 11, which further shortens the subsequent drying time for the purified material.

[0026] In this embodiment, if Figure 1-3 As shown, the end face of the discharge end of the steel pipe 9 is an inclined surface, and an arc-shaped guide plate 14 is fixed at the lowest point of the inclined end face. The guide plate 14 extends along the inclined surface to facilitate guiding the solid material to the drying equipment and reduce the risk of material spilling.

[0027] In this embodiment, if Figure 1 As shown, casters 15 are provided at the bottom of the bracket to facilitate the movement of the equipment.

[0028] In this embodiment, if Figure 1 As shown, a crossbeam 16 is also fixed on the bracket, and a screw rod 17 is screwed on the crossbeam 16. A disc 18 is fixed to the end of the screw rod 17 close to the ground. The disc 18 is pressed tightly against the ground by turning the screw rod 17. When the material moves to the specified position, it is locked by the disc 18 to avoid slippage that affects the work.

[0029] The working process of the utility model is as follows: open the cylinder cover 2, add materials (silicon ash), open the liquid inlet pipe 19 to add acid leaching liquid into the cylinder 1, close the liquid inlet pipe 19 after adding a sufficient amount of acid leaching liquid, and cover the cylinder cover 2; the gas supply pipe 4 is connected to an external gas source, such as an air pump or a gas cylinder, and the gas releases bubbles into the cylinder 1 through a gas injector. The bubbles will cause the acid leaching liquid to flow and play a stirring role, thereby increasing the mixing degree of the acid leaching liquid and the solid material in the cylinder 1, and at the same time accelerate the renewal of the acid leaching liquid around the solid material, thereby accelerating the acid leaching process. The acid gas and excess gas generated during the acid leaching process are discharged through the gas overflow port 7. After 4 hours of reaction, the acid leaching is completed, the ventilation is stopped, the pressure relief valve 6 and the drain pipe 3 are opened, and the reaction solution is discharged. A filter screen is provided at the mouth of the drain pipe 3, and the granular SiO2 will not flow out with the reaction solution. After draining the reaction solution, close the drain pipe 3, open the discharge pipe, and the solid particles at the bottom of the cylinder enter the screw conveyor 8 through the discharge pipe, are pushed to the steel pipe 9 for discharge, and enter the drying equipment for subsequent treatment.

[0030] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An acid leaching device for purifying silica ash, comprising an open cylinder (1) and a bracket, wherein the bracket is used to erect the cylinder (1) on the ground, a cylinder cover (2) is screwed onto the cylinder (1), a discharge pipe and a liquid discharge pipe (3) are arranged at the bottom of the cylinder (1), a filter screen is arranged at the pipe mouth of the liquid discharge pipe (3), a liquid inlet pipe (19) is arranged at the cylinder (1) away from the discharge pipe, the opening and closing of the discharge pipe, the opening and closing of the liquid discharge pipe (3) and the opening and closing of the liquid inlet pipe (19) are all controlled by valves, and the characteristics are as follows: An air supply pipe (4) is fixed inside the cylinder (1) near the discharge pipe. The air supply pipe (4) is circumferentially arranged inside the cylinder (1) and the air inlet end is located outside the cylinder (1). A plurality of branch pipes (5) are evenly distributed on the air supply pipe (4). The branch pipes (5) are located inside the cylinder (1) and extend toward the cylinder cover (2). A plurality of gas injectors are evenly distributed on the branch pipes (5) along the extension direction thereof. A pressure relief valve (6) and a gas overflow port (7) are installed on the cylinder cover (2). An acid gas filter layer is provided on the gas overflow port (7).

2. The acid leaching device for purifying silica fume according to claim 1, characterized in that: It also comprises a screw conveyor (8), the end of the discharge pipe being connected to a feed port of the screw conveyor (8), and the feed port of the screw conveyor (8) being located below the discharge port.

3. The acid leaching device for purifying silica fume according to claim 2, characterized in that: A steel pipe (9) is fixed on the discharge port of the screw conveyor (8), the steel pipe (9) extending toward the barrel cover (2), a screw rod (10) is fixed inside the steel pipe (9) along its axial centerline direction, an extrusion plate (11) and a spring (12) are sleeved on the screw rod (10), a nut (13) is also screwed on the screw rod (10), and the spring (12) is compressed and installed between the extrusion plate (11) and the nut (13).

4. The acid leaching device for purifying silica fume according to claim 3, characterized in that: The end face of the discharge end of the steel pipe (9) is an inclined surface, and an arc-shaped material guide plate (14) is fixed at the lowest point of the inclined end face, and the material guide plate (14) extends along the inclined surface.

5. The acid leaching device for purifying silica fume according to claim 1, characterized in that: Casters (15) are provided at the bottom of the bracket.

6. The acid leaching device for purifying silica fume according to claim 5, characterized in that: A crossbeam (16) is also fixed on the bracket, a screw rod (17) is screwed on the crossbeam (16), a disc (18) is fixed on the end of the screw rod (17) close to the ground, and the disc (18) is pressed tightly against the ground by twisting the screw rod (17).

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