Multi-section rusting system and rusting method for iron-containing minerals

Abstract

The invention relates to the technical field of iron-containing mineral corrosion, in particular to a multi-section corrosion system for iron-containing minerals. The multi-section corrosion system comprises a stirring pool, a second-section bubble corrosion pipe set, a third-section corrosion storage pool, a cyclone and a heavy-phase storage pool. A multi-stage rusting method for iron-containing minerals comprises the following steps that S1, the iron-containing minerals and acid rusting liquid are put into a stirring pool to be stirred, and oxygen-containing gas is introduced into a spiral gas pipe; s2, the iron-containing mineral corrosion mixed liquid flows downwards, oxygen-containing gas spirally flows upwards, and second-stage corrosion treatment is carried out; s3, entering a third-section corrosion storage tank, and performing third-section corrosion treatment; s4, the materials enter the cyclone to be separated, and the titanium-rich materials enter the heavy-phase material storage pool; and S5, pumping back into the stirring tank, and repeating the steps. By the adoption of the method, the overall time of rusting treatment can be greatly shortened, the rusting treatment efficiency is remarkably improved, the titanium-rich material pumping-back probability is reduced, energy consumption is remarkably reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of iron-containing mineral corrosion, and particularly relates to a multi-stage corrosion system and a corrosion method for iron-containing minerals. Background Art

[0002] Artificial rutile, also known as synthetic rutile, is a titanium-rich raw material that is produced by using chemical processing methods to separate most of the iron components from ilmenite and has the same composition, structure, and properties as natural rutile. At present, common industrial production technologies for artificial rutile at home and abroad include acid leaching and other technologies. The traditional process of acid leaching generally includes: (1) crushing the minerals into particles with a certain particle size; (2) putting the acidic corrosion solution and the minerals into a reaction tank and stirring; (3) introducing air / oxygen during the stirring process to oxidize and corrode the iron in the iron-containing minerals to generate tiny iron oxide microparticles, which fall off the ore body into the corrosion solution; (4) separating the ore body from the iron oxide slurry. The corrosion treatment in the above-mentioned existing technologies mainly has the following problems: (1) The contact area between air and minerals is limited, resulting in low oxidation and corrosion efficiency. It is necessary to repeatedly mix and corrode the heavy phase after cyclone for many times, with high energy consumption and low efficiency; (2) Most of the stirring tanks are open-type. If high-concentration oxygen is introduced, some oxygen that has not fully participated in the reaction will directly escape, increasing production costs. Summary of the Invention

[0003] In view of the above deficiencies, the present invention provides a multi-stage corrosion system and a corrosion method for iron-containing minerals to solve the problems in the above background art.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A multi-stage corrosion system for iron-containing minerals includes a stirring tank, a two-stage bubble corrosion pipe group, a three-stage corrosion storage tank, a cyclone, and a heavy-phase storage tank; a feed main pipe is arranged at the upper part of the stirring tank; the two-stage bubble corrosion pipe group includes a plurality of bubble spiral pipes; the main body of the bubble spiral pipe is a spiral pipe structure, and a spiral air pipe is arranged inside the spiral pipe; a plurality of air outlet holes are arranged on the side wall of the spiral air pipe, and its top end is closed, and the lower end of the spiral air pipe is connected to a positive-pressure air pipe; the bubble spiral pipe connects the stirring tank and the three-stage corrosion storage tank; the three-stage corrosion storage tank is provided with a discharge pipe, and the discharge pipe is connected to the feed inlet of the cyclone; the heavy-phase discharge port at the lower end of the cyclone is connected to the feed inlet of the heavy-phase storage tank.

[0006] Optionally, the two-stage bubble corrosion pipe group further includes support columns, and the support columns are arranged between the stirring tank and the three-stage corrosion storage tank; the bubble spiral pipes are spirally fixed on the support columns. Optionally, the lower end of the bubble spiral pipe is connected to a storage tank feed pipe.

[0007] Optionally, the lower end of the storage tank feed pipe extends to the bottom of the three-stage rusty storage tank.

[0008] Optionally, a number of the discharge pipes are arranged in a circle at intervals along the lower part of the three-stage rusty storage tank.

[0009] Optionally, a communicating air pipe is arranged between the mixing tank and the three-stage rusty storage tank, and an air valve is arranged on the communicating air pipe.

[0010] Optionally, the heavy-phase storage tank is provided with a reflux material pipe; the upper end of the reflux material pipe is communicated with the total feed pipe.

[0011] Optionally, the mixing tank is a closed mixing tank; a material valve is arranged on the total feed pipe. A multi-stage rusting method for iron-containing minerals, using the multi-stage rusting system for iron-containing minerals as described above, includes:

[0012] S1: Put iron-containing minerals and an acidic rusting solution into the mixing tank and stir them into an iron-containing mineral rusting mixture. During the stirring process, introduce oxygen-containing gas into the spiral air pipe, and control the air pressure in the mixing tank to be less than the air pressure in the positive pressure air pipe; the bubbles entering the mixing tank from the bubble spiral pipe undergo a first-stage rusting treatment with the iron-containing mineral rusting mixture.

[0013] S2: The iron-containing mineral rusting mixture enters the bubble spiral pipe and flows downward in a spiral manner. The oxygen-containing gas spirally flows upward from the lower end of the spiral air pipe and enters the bubble spiral pipe from its air outlet holes, and is mixed with the downward-flowing iron-containing mineral rusting mixture to undergo a second-stage rusting treatment. The formed bubbles flow upward into the mixing tank.

[0014] S3: The iron-containing mineral rusting mixture and part of the bubbles after the second-stage rusting treatment enter the three-stage rusty storage tank for a third-stage rusting treatment.

[0015] S4: The iron-containing mineral rusting mixture after the third-stage rusting treatment enters the cyclone for separation, and a titanium-rich material and iron oxide slurry are obtained after separation; the titanium-rich material enters the heavy-phase storage tank.

[0016] S5: Take a sample and conduct a random inspection on the titanium-rich material in the heavy-phase storage tank. According to the inspection results, it can be selected to pump back the titanium-rich material in the heavy-phase storage tank to the mixing tank, and repeat the above steps.

[0017] S6: Collect and process the iron oxide slurry and the titanium-rich material respectively.

[0018] Optionally, in step S5, if the pulp concentration reaches 8-13% and the iron content in the ore body is greater than 10%, the titanium-rich material in the heavy-phase storage tank is pumped back to the mixing tank.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] (1) Using the device of the present invention can greatly shorten the overall time of rust treatment, significantly improve the efficiency of rust treatment, reduce the probability of pumping back titanium-rich materials, significantly reduce energy consumption, and improve production efficiency.

[0021] (2) Using this method can achieve adjustable and controllable slurry fluid rate. At the same time, using multi-stage rust treatment, when introducing oxygen-containing gas, compared with the traditional method, it can achieve the same or more sufficient reaction effect with a relatively lower oxygen content concentration, reduce the cost of oxygen raw materials, improve the efficiency of rust treatment, and have better controllability.

[0022] (3) The mixing tank is a closed mixing tank. The gas after passing through the bubble spiral tube can also be introduced into the mixing tank for continuous reaction, and as a pneumatic air source, it can realize the regulation of the slurry flow rate. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments.

[0024] Figure 1 is a schematic structural diagram of the multi-stage rust system of the present invention;

[0025] Figure 2 is a partial perspective view of the bubble spiral tube of the present invention. Detailed Embodiments

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inside", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the invention is usually placed. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0028] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "arrangement" and "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] A multi-stage rusting system for iron-containing minerals, as Figures 1 - 2 shown, includes a device body 1. The device body 1 successively includes a stirring tank 1-1, a two-stage bubble rusting pipe group 1-2, a three-stage rusting storage tank 1-3, a cyclone 13, and a heavy-phase storage tank 15 from top to bottom; a feed main pipe 26 is arranged at the upper part of the stirring tank 1-1, and a stirring device 5 is arranged inside it. The stirring device is driven by a motor 2; the two-stage bubble rusting pipe group 1-2 includes a number of bubble spiral pipes 8; in this embodiment, in order to improve the stability of the bubble spiral pipes 8, the two-stage bubble rusting pipe group 1-2 further includes support columns 9. The support columns 9 are arranged between the stirring tank 1-1 and the three-stage rusting storage tank 1-3. In this embodiment, a number of the support columns 9 are provided and arranged at circular intervals. There can be several circles and they are evenly arranged on the bottom surface of the stirring tank 1-1; and arranging a number of bubble spiral pipes 8 can improve the processing efficiency.

[0030] The bubble spiral pipes 8 are spirally fixed on the support columns 9. The main body of the bubble spiral pipes 8 is a spiral pipe structure, as Figure 2 shown. A spiral air pipe 8-1 is arranged inside its spiral pipe, that is, the spiral air pipe 8-1 is spirally arranged synchronously with the bubble spiral pipes 8. In this embodiment, in order to improve the fixing stability of the spiral air pipe 8-1, the spiral air pipe 8-1 can be fixed to the inner pipe wall of the bubble spiral pipes 8 through a number of fixing rods 8-2; a number of air outlet holes 8-1-1 are arranged on the side wall of the spiral air pipe 8-1, and the top end of the spiral air pipe 8-1 is closed to prevent the material liquid from pouring into the spiral air pipe 8-1. The lower end of the spiral air pipe 8-1 is connected to a positive pressure air pipe 23, and the positive pressure air pipe 23 is connected to a positive pressure air pump or an oxygen-containing compressed air tank. When connecting to an oxygen-containing compressed air tank, a pressure stabilizing valve or a pressure regulating valve needs to be added; the bubble spiral pipes 8 connect the stirring tank 1-1 and the three-stage rusting storage tank 1-3; in this embodiment, for the convenience of regulating the air pressure of the three-stage rusting storage tank 1-3, the following preferred scheme is adopted: the lower end of the bubble spiral pipes 8 is connected to a storage tank feed pipe 10, and the lower end of the storage tank feed pipe 10 extends to the bottom of the three-stage rusting storage tank 1-3.

[0031] The functions of the structure of the bubble spiral tube 8 in this embodiment are as follows: 1. A number of the bubble spiral tubes 8 play a role in shunting, improving the reaction efficiency; 2. Through the spiral design, the travel distance of the iron-containing mineral rust mixed liquid is increased; 3. Throughout the whole process of spiral flow, the spiral gas pipe 8-1 can continuously blow out oxygen-containing gas to ensure that all mineral particles in the fluid can fully contact with oxygen and then react, improving the treatment efficiency; 4. By controlling the intake air volume and the outlet air volume (bubble volume), the fluidity of the feed liquid can be increased, improving the treatment efficiency; 5. The feed liquid flows from top to bottom, while the gas (some bubbles) flows from bottom to top, so that all mineral particles in the fluid can have the "opportunity" to contact with oxygen, reducing the phenomenon that some mineral particles cannot contact with oxygen in the traditional stirring scheme (i.e., the so-called starvation reaction, resulting in incomplete reaction of some parts within a certain reaction time and low efficiency); 6. Part of the unreacted oxygen continues to flow into the stirring tank 1-1 for stirring reaction.

[0032] The three-stage rust storage tank 1-3 is provided with a discharge pipe 12, and the discharge pipe 12 is communicated with the feed inlet of the cyclone 13; the lower heavy-phase discharge port 14 of the cyclone 13 is communicated with the feed inlet of the heavy-phase storage tank; and the light-phase outlet 11 is communicated with the iron oxide slurry collection pipe; in this embodiment, to improve the treatment efficiency, a number of the discharge pipes 12 are provided, and a number of the discharge pipes 12 are arranged in a circle at intervals along the lower part of the three-stage rust storage tank 1-3; then the cyclone 13 is also correspondingly arranged in a circle.

[0033] Optionally, a connecting air pipe 7 is provided between the stirring tank 1-1 and the three-stage rust storage tank 1-3. An air valve 6 is provided on the connecting air pipe 7, and the top of the connecting air pipe 7 is arranged above the highest liquid level 4 of the stirring tank 1-1. The function of this setting is as follows: it is used to adjust the air pressure ratio between the stirring tank 1-1 and the three-stage rust storage tank 1-3, and the processing rate of the liquid material in the second-stage bubble rust tube group 1-2 is adjusted by controlling the air pressure ratio. For example, during use, as the gas in the second-stage bubble rust tube group 1-2 continuously enters the stirring tank 1-1, the air pressure in the stirring tank 1-1 rises, which is beneficial to increasing the gas saturation in the liquid. At the same time, the rising air pressure in the stirring tank 1-1 can increase the flow rate of the slurry in the bubble spiral tube 8. If factors such as environmental temperature affect the reaction efficiency, the air pressure in the three-stage rust storage tank 1-3 can also be increased, thereby reducing the flow rate of the slurry in the bubble spiral tube 8 and increasing the time of this section of the journey to ensure the reaction effect. At the same time, the efficiency of the cyclone 13 can also be adjusted by controlling the air pressure in the three-stage rust storage tank 1-3. In this embodiment, pressure gauges 3 and 22 are respectively provided on the stirring tank 1-1 and the three-stage rust storage tank 1-3, and a pressure relief valve and a safety valve (not shown) are also respectively provided. For the convenience of liquid level control, in this embodiment, a connecting pipe 25 and a connecting pipe 21 are respectively provided on the stirring tank 1-1 and the three-stage rust storage tank 1-3. In this embodiment, the heavy-phase storage tank 15 can be optionally set in an open type that communicates with the atmosphere. In order to improve the stability of the cyclone 13, in this embodiment, a strengthening column 17 is provided between the three-stage rust storage tank 1-3 and the heavy-phase storage tank 15, and the cyclone 13 is fixed on the strengthening column 17.

[0034] Optionally, the heavy-phase storage tank 15 is provided with a return material pipe 18. The return material pipe 18 is connected with a pressure pump 19 and communicates with the feed main pipe 26 through a connecting pipe 20. A material valve (not shown) is provided on the connecting pipe 20. To ensure the tightness of the stirring tank 1-1, in this embodiment, a material valve 27 is provided on the feed main pipe 26, and the material valve 27 is arranged between the stirring tank 1-1 and the connecting pipe 20. The lower part of the heavy-phase storage tank 15 is provided with a discharge pipe 16, and a valve is provided on the discharge pipe 16.

[0035] A multi-stage rusting method for iron-containing minerals, using the multi-stage rusting system for iron-containing minerals as described above, includes:

[0036] S1: Put the iron-containing minerals and the acidic rust solution into the stirring tank and stir them into an iron-containing mineral rust mixture. During the stirring process, introduce oxygen-containing gas into the spiral air pipe, and control the air pressure in the stirring tank to be less than the air pressure in the positive pressure air pipe. The bubbles entering the stirring tank from the bubble spiral pipe undergo a first-stage rust treatment with the iron-containing mineral rust mixture.

[0037] S2: The iron-containing mineral rust mixture enters the bubble spiral pipe and flows downward in a spiral manner. The oxygen-containing gas flows upward in a spiral manner from the lower end of the spiral air pipe and enters the bubble spiral pipe through its air outlet holes, mixing with the downward-flowing iron-containing mineral rust mixture for a second-stage rust treatment. The formed bubbles flow upward and enter the stirring tank.

[0038] S3: The iron-containing mineral rust mixture and some bubbles after the second-stage rust treatment enter the three-stage rust storage tank for a three-stage rust treatment.

[0039] S4: The iron-containing mineral rust mixture after the three-stage rust treatment enters the cyclone for separation. After separation, a titanium-rich material and iron oxide slurry are obtained. The titanium-rich material enters the heavy-phase storage tank.

[0040] S5: Take a sample and conduct a random inspection on the titanium-rich material in the heavy-phase storage tank. According to the inspection results, it is possible to choose to pump back the titanium-rich material in the heavy-phase storage tank to the stirring tank. In this embodiment, if the pulp concentration reaches 8 - 13% and the iron content in the ore body is greater than 10%, then pump back the titanium-rich material in the heavy-phase storage tank to the stirring tank; and repeat the above steps.

[0041] S6: Collect and process the iron oxide slurry and the titanium-rich material respectively.

Claims

1. A multi-stage corrosion system for iron-containing minerals, characterized in that: It comprises a stirring tank, a two-stage bubble corrosion tube group, a three-stage corrosion storage tank, a cyclone and a heavy phase storage tank; a feeding main pipe is arranged on the upper part of the stirring tank; the two-stage bubble corrosion tube group comprises a plurality of bubble spiral tubes; the main body of the bubble spiral tube is a spiral tube structure, and a spiral air pipe is arranged inside the spiral tube; a plurality of air outlet holes are arranged on the side wall of the spiral air pipe, the top end of which is closed, and the lower end of the spiral air pipe is connected to the positive pressure air pipe; the bubble spiral tube connects the stirring tank and the three-stage corrosion storage tank; the three-stage corrosion storage tank is provided with a discharge pipe, and the discharge pipe is connected to the feed port of the cyclone; the heavy phase discharge port at the lower end of the cyclone is connected to the feed port of the heavy phase storage tank.

2. A multi-stage corrosion system for iron-containing minerals according to claim 1, characterized in that: The two-stage bubble corrosion tube group also includes a support column, which is arranged between the stirring tank and the three-stage corrosion storage tank; the bubble spiral tube is spirally fixed on the support column.

3. The multi-stage corrosion system for iron-containing minerals according to claim 1, characterized in that: The lower end of the bubble spiral tube is communicated with the material storage tank feed pipe.

4. A multi-stage corrosion system for iron-containing minerals according to claim 3, characterized in that: The lower end of the material storage tank feed pipe extends to the bottom of the three-stage rusted material storage tank.

5. The multi-stage corrosion system for iron-containing minerals according to claim 1, characterized in that: A plurality of the discharge pipes are arranged alternately in a circle along the lower part of the three-stage rust storage tank.

6. The multi-stage corrosion system for iron-containing minerals according to claim 1, characterized in that: A communicating air pipe is arranged between the stirring tank and the three-stage rust storage tank, and an air valve is arranged on the communicating air pipe.

7. The multi-stage corrosion system for iron-containing minerals according to claim 1, characterized in that: The heavy phase storage tank is provided with a reflux pipe; the upper end of the reflux pipe is connected to the feed main pipe.

8. The multi-stage corrosion system for iron-containing minerals according to claim 1, characterized in that: The stirring tank is a closed stirring tank; the feed main pipe is provided with a material valve.

9. A multi-stage corrosion method for iron-containing minerals, characterized in that: The multi-stage corrosion system for iron-containing minerals according to any one of claims 1 to 8 comprises: S1: putting iron-containing minerals and acidic rusting liquid into the stirring tank and stirring them into an iron-containing mineral rusting mixed liquid, and introducing oxygen-containing gas into the spiral air pipe during the stirring process, and controlling the air pressure in the stirring tank to be lower than the air pressure in the positive pressure air pipe; the bubbles entering the stirring tank from the bubble spiral pipe and the iron-containing mineral rusting mixed liquid undergo a first stage of rusting treatment; S2: The iron-containing mineral corrosion mixture enters the bubble spiral tube and flows spirally downward, and the oxygen-containing gas flows spirally upward from the lower end of the spiral gas tube and enters the bubble spiral tube from its outlet hole to mix with the iron-containing mineral corrosion mixture flowing downward, and performs a two-stage corrosion treatment, and the formed bubbles flow upward into the stirring tank; S3: After the second stage corrosion treatment, the iron-containing mineral corrosion mixture and some bubbles enter the third stage corrosion storage tank for the third stage corrosion treatment; S4: the iron-containing mineral rust mixed liquid after three-stage rust treatment enters the cyclone for separation, and titanium-rich material and iron oxide slurry are obtained after separation; wherein the titanium-rich material enters the heavy phase storage tank; S5: sampling and inspecting the titanium-rich material in the heavy phase storage tank, and according to the inspection results, the titanium-rich material in the heavy phase storage tank can be pumped back into the stirring tank, and the above steps are repeated; S6: Collect and process the iron oxide slurry and titanium-rich material respectively.

10. A multi-stage corrosion method for iron-containing minerals according to claim 9, characterized in that: In the step S5, if the slurry concentration reaches 8-13% and the iron content of the ore body is greater than 10%, the titanium-rich material in the heavy phase storage tank is pumped back into the stirring tank.

Images