Carbonization bubbling system and method for efficiently activating Bayer red mud

Abstract

The invention relates to the technical field of industrial solid waste resource comprehensive utilization, in particular to a carbonization bubbling system and method for efficiently activating Bayer red mud, which comprises an acidolysis tower, an acidolysis tank, a CO2 inlet system, an overflow gas compression control box, a circulating gas flow pipe, a solid-liquid separation controller, a slag stacking tank and a gas flow circulating bubbling tower, the acidolysis tower is communicated with the acidolysis pool through a delivery pump, a red mud pumping pipeline communicated with the airflow circulating bubble tower through the delivery pump is arranged in the acidolysis pool, an overflow gas filter is arranged at the top of the airflow circulating bubble tower, and the circulating airflow pipe is arranged at the upper end of the airflow circulating bubble tower. By means of the scheme, the method has the advantages that effective comprehensive utilization of industrial waste acid, industrial metallurgical solid waste Bayer red mud and industrially generated CO2 can be achieved, the Bayer red mud is efficiently activated through carbon, and the resource utilization rate of the Bayer red mud is increased, and the problem that carbon activation of the red mud cannot be efficiently achieved through an existing carbonization technology is solved.

Description

Technical Field

[0001] The invention relates to the technical field of comprehensive utilization of industrial solid waste resources, and in particular to a carbonization bubbling system and method for efficiently activating Bayer red mud. Background Art

[0002] Bayer red mud is the waste residue produced by the production of alumina by using bauxite and caustic soda (NaOH) in a wet process. Due to its low production cost and simple process, it has been used in the production of alumina in industry since the early 20th century and has become the main method for producing alumina in the world. Bayer red mud accounts for 95% of the total red mud in the world. Its inherent strong alkalinity and low activity make it difficult to be effectively utilized as a resource. The main chemical components of Bayer red mud are Fe2O3, SiO2, Al2O3, CaO, Na2O, etc., and the mineral composition is mainly hematite (Fe2O3), TCA (Ca3Al2O6), cancrystal (NaAlSiO4) and albite (Na2Al2Si6O16), etc. It can be seen from this that Al, Si and Ca in Bayer red mud mainly exist in a chemical form with good stability and high crystallinity, which directly leads to the insufficient activity of Bayer red mud and makes it difficult to achieve large-scale comprehensive utilization in the field of cementitious materials.

[0003] The existing method of disposing Bayer red mud is mainly open-air storage. During long-term storage, alkaline substances in the red mud will seep into the soil, groundwater and diffuse into the air, polluting the environment and endangering human health. Therefore, studying the method of effectively recycling Bayer red mud is a key technology to solve the environmental problems related to Bayer red mud. The Bayer red mud is activated by selective acid hydrolysis and bubbling carbonization to improve the resource utilization rate of Bayer red mud.

[0004] At present, the existing carbonization technology has the following problems:

[0005] 1. During the carbonization process, due to the uneven distribution of red mud particles, the calcium carbonate formed after the carbonization reaction of Ca2+ on the surface of the particles will gradually inhibit the carbonization process, resulting in incomplete carbonization;

[0006] 2. Some of the CO2 introduced does not participate in the reaction and is directly discharged into the air, exacerbating the greenhouse effect;

[0007] 3. The carbonization temperature is generally between room temperature and 70°C. The lack of low-temperature control results in a low critical saturation of CO2 in water, which leads to a large number of calcium carbonate clusters, affecting the activity of carbonized red mud. Therefore, the particle uniformity, CO2 flow rate and temperature of the bubbling carbonization reaction are the key issues that determine the red mud carbon activation reaction. To this end, we propose a carbonization bubbling system and method for efficiently activating Bayer red mud. Summary of the invention

[0008] The purpose of the present invention is to provide a carbonization bubbling system and method for efficiently activating Bayer red mud, which has the advantages of realizing the effective comprehensive utilization of industrial waste acid, industrial metallurgical solid waste Bayer red mud, and industrially generated CO2, efficiently carbon-activating Bayer red mud, and improving the resource utilization rate of Bayer red mud, thus solving the problem that the existing carbonization technology cannot efficiently solve the problem of red mud carbon activation.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a carbonization bubbling system for efficiently activating Bayer red mud, comprising an acidolysis tower, an acidolysis tank, a CO2 intake system, an overflow compression control box, a circulating air flow pipe, a solid-liquid separation controller, a slag pool and an air flow circulation bubbling tower, the acidolysis tower is connected to the acidolysis tank through a delivery pump, a red mud slurry pumping pipeline connected to the air flow circulation bubbling tower through a delivery pump is arranged in the acidolysis tank, an overflow filter is arranged on the top of the air flow circulation bubbling tower, the circulating air flow pipe is arranged at the upper end of the air flow circulation bubbling tower, and one end of the circulating air flow pipe is connected to the top of the overflow filter, the overflow compression control box is connected to one end of the circulating air flow pipe away from the air flow circulation bubbling tower, the overflow compression control box is connected to the CO2 intake system through a pipeline, and the solid-liquid separation controller is connected to the solid-liquid separation controller through a pipe. The channel is connected with the air circulation bubbling tower, the slag discharge pipe of the solid-liquid separation controller extends into the slag pool, a temperature controller is arranged on the outside of the air circulation bubbling tower, a bubbling ventilation disk is fixedly installed on the bottom of the inner cavity of the air circulation bubbling tower, a plurality of pulse spoilers with equal angles are fixedly installed on the inner wall of the air circulation bubbling tower, and the pulse frequency of the pulse spoiler has two-level control of large and small, a plurality of pulse emission holes are arranged on one side of the pulse spoiler, a rotating shaft motor is fixedly installed on the top of the air circulation bubbling tower, a rotating shaft is fixedly connected to the output end of the rotating shaft motor, a medium-sized stirring paddle, a small stirring paddle and a large stirring paddle are fixedly installed on the outer surface of the rotating shaft in sequence from top to bottom, and a carbon dioxide air supply pipeline is connected between the lower end of the CO2 air intake system and the bottom of the bubbling ventilation disk.

[0010] Preferably, the acidolysis tower comprises a red mud feed inlet, a water inlet, a stirrer motor, a stirring shaft, an acidolysis liquid discharge coil, a stirrer, an acidolysis red mud slurry thickening discharge port and a discharge port, wherein the acidolysis red mud slurry thickening discharge port and the discharge port are respectively located at the lower end and the bottom of the inner cavity of the acidolysis tower, the red mud feed inlet and the water inlet are respectively located on both sides of the upper end of the acidolysis tower, the acidolysis liquid discharge coil is fixedly installed at the upper end of the inner cavity of the acidolysis tower, the stirrer motor is fixedly installed at the top of the acidolysis tower, the stirring shaft is located on the inner side of the acidolysis tower, and the upper end of the stirring shaft is fixedly connected to the output end of the stirrer motor through a coupling, and the stirrer is fixedly installed at the lower end of the outer surface of the stirring shaft.

[0011] Preferably, the bubbling ventilation disk includes an outer ring bubbling disk, a middle ring bubbling disk and an inner ring bubbling disk from the outside to the inside. The tops of the outer ring bubbling disk, the middle ring bubbling disk and the inner ring bubbling disk are all provided with bubbling holes of controllable size, which can adjust the size of the bubbling holes and control the CO2 bubbling size. The bubbling ventilation disk is connected to the CO2 ventilation system to control the bubbling frequency of CO2.

[0012] Preferably, a solid-liquid separation pump is provided at one end of the solid-liquid separation controller.

[0013] Preferably, carbonized slag is arranged inside the slag pool, and acid-hydrolyzed red mud slurry is arranged inside the acid-hydrolyzed pool.

[0014] Preferably, the medium-sized stirring paddle and the large-sized stirring paddle stir clockwise, and the small-sized stirring paddle stirs counterclockwise, and the stirring rates of the medium-sized stirring paddle, the small-sized stirring paddle and the large-sized stirring paddle are all independently controlled.

[0015] Preferably, the overflow compression control box includes three automatic controllers: a pressurized air intake controller, which is activated when the gas pressure is insufficient; a decompression air outlet controller, which is activated when the gas pressure exceeds the limit; and a pressure relief safety controller, which is activated when the decompression air outlet controller fails.

[0016] A method for efficiently activating the carbonization bubbling of Bayer red mud, the method comprising the following steps:

[0017] S1: Measure 100 parts of industrial waste acid, prepare acid solution of a certain concentration as required, weigh 20-30 parts of Bayer red mud, and mix it with water at a fixed solid-liquid ratio to form red mud slurry as required;

[0018] S2: pumping the acid-hydrolyzed red mud to an air circulation bubbling tower;

[0019] S3: The CO2 inlet system delivers CO2 to the bottom of the tower through an airflow pipe connected to the bubbling aeration disk, and controls the size of the vent holes and the ventilation flow rate of the bubbling aeration disk to achieve control of the CO2 flow rate and bubble size;

[0020] S4: Start the temperature controller of the bubbling tower to adjust the critical solubility of CO2 in the aqueous solution by the ambient temperature of the bubbling tower, so as to improve the carbonization reaction efficiency of Bayer red mud;

[0021] S5: Start the three-stage stirring system and pulse spoiler of the medium-sized stirring paddle, small stirring paddle and large stirring paddle of the bubble tower to adjust the uniformity of the Bayer red mud suspended particles in the solution and increase the contact area of ​​the particles for carbonization reaction;

[0022] S5: The unreacted CO2 in the carbonization process is introduced into the overflow compression control box through the circulating gas flow pipe at the top of the bubbling tower, and finally introduced into the CO2 intake system to be recycled for the bubbling carbonization reaction;

[0023] S6: The generated carbonized red mud slurry is separated into solid and liquid through a solid-liquid separation controller to recover the carbonized slag.

[0024] Preferably, the industrial waste acid in step S1 is titanium dioxide waste acid and waste sulfuric acid, the ratio of red mud treated in the acidolysis tank to water is in the range of 1:3-1:5, and the concentration of the acidolysis solution is 35g / L, 50g / L, and 100g / L.

[0025] Preferably, the gas used in the CO2 intake system is industrially purified carbon dioxide, and the red mud slurry entering the air circulation bubbling tower is diluted with water and controlled to have a concentration of 100 g / L.

[0026] Preferably, the control range of the temperature controller is 10°C-70°C.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention utilizes industrial waste acid as the acid hydrolysis liquid for Bayer red mud acid hydrolysis treatment, which can effectively utilize the acidic waste liquid that is difficult to treat in industry, provide an effective disposal method for the resource utilization of industrial waste acid, and also reduce the cost of acid hydrolysis treatment of Bayer red mud.

[0029] 2. The present invention improves the recycling rate of CO2 by forming a CO2 recycling system through an air circulation bubbling tower, a circulating air flow pipe and an overflow compression control box.

[0030] 3. The overflow compression control box of the present invention realizes full-automatic system control of the overflow compression control box through three systems of pressurized air intake, reduced pressure exhaust and safe pressure relief.

[0031] 4. The airflow circulation bubbling tower of the present invention effectively improves the uniformity of suspended red mud particles and the bubbling carbonization efficiency through the joint action of a bubbling aeration disk, a medium-sized agitator, a small agitator and a large agitator. The three-stage stirring system, a temperature controller and a pulse spoiler achieve efficient carbon activation treatment of Bayer red mud. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the carbonization bubbling system of Bayer red mud of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the acid hydrolysis tower of the present invention;

[0034] Figure 3 It is a schematic diagram of the bubbling ventilation disk of the present invention;

[0035] Figure 4 Schematic diagram of the pulse spoiler of the present invention.

[0036] In the figure: 1, acid hydrolysis tower; A1, red mud feed port; A2, water inlet; A3, agitator motor; A4, agitator shaft; A5, acid hydrolysis liquid outlet coil; A6, agitator; A7, acid hydrolysis red mud slurry thickening outlet; A8, outlet; 2, acid hydrolysis red mud slurry; 3, acid hydrolysis tank; 4, red mud slurry pumping pipeline; 5, carbon dioxide gas delivery pipeline; 6, CO2 intake system; 7, overflow compression control box; 8, circulating gas flow pipe; 9, rotating shaft motor; 10, overflow filter; 11, rotating shaft; 12, medium-sized agitator; 13, small agitator; 14, large agitator; 15, bubbling ventilation disk; B1, outer ring bubbling disk; B2, middle ring bubbling disk;

[0037] B3, inner ring bubbling disk; B4, controllable size bubbling hole; 16, pulse spoiler; C1, pulse emission hole; 17, temperature controller; 18, solid-liquid separation pump; 19, solid-liquid separation controller; 20, slag pool; 21, carbonized slag; 22, air circulation bubbling tower. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figure 1-Figure 4As shown, the present invention provides a technical solution: a carbonization bubbling system and method for efficiently activating Bayer red mud, comprising an acidolysis tower 1, an acidolysis tank 3, a CO2 intake system 6, an overflow compression control box 7, a circulating air flow pipe 8, a solid-liquid separation controller 19, a slag pool 20 and an air circulation bubbling tower 22, the acidolysis tower 1 is connected to the acidolysis tank 3 through a delivery pump, a red mud slurry pumping pipeline 4 connected to the air circulation bubbling tower 22 through a delivery pump is arranged in the acidolysis tank 3, an overflow filter 10 is arranged on the top of the air circulation bubbling tower 22, the circulating air flow pipe 8 is arranged at the upper end of the air circulation bubbling tower 22, and one end of the circulating air flow pipe 8 is connected to the top of the overflow filter 10, the overflow compression control box 7 is connected to one end of the circulating air flow pipe 8 away from the air circulation bubbling tower 22, the overflow compression control box 7 is connected to the CO2 intake system 6 through a pipeline, and the solid-liquid separation controller 19 is connected to the gas circulation bubbling tower 22 through a pipeline. The air circulation bubbling tower 22 is connected, the slag discharge pipe of the solid-liquid separation controller 19 extends into the slag pool 20, a temperature controller 17 is arranged on the outside of the air circulation bubbling tower 22, a bubbling ventilation disk 15 is fixedly installed at the bottom of the inner cavity of the air circulation bubbling tower 22, a plurality of pulse spoilers 16 distributed at equal angles are fixedly installed on the inner wall of the air circulation bubbling tower 22, and the pulse frequency of the pulse spoiler 16 has two-level control of large and small, a plurality of pulse emission holes C1 are arranged on one side of the pulse spoiler 16, a rotating shaft motor 9 is fixedly installed on the top of the air circulation bubbling tower 22, the output end of the rotating shaft motor 9 is fixedly connected to the rotating shaft 11, a medium-sized stirring paddle 12, a small stirring paddle 13 and a large stirring paddle 14 are fixedly installed on the outer surface of the rotating shaft 11 from top to bottom, and a carbon dioxide gas supply pipeline 5 is connected between the lower end of the CO2 air intake system 6 and the bottom of the bubbling ventilation disk 15.

[0040] Specifically, the acidolysis tower 1 includes a red mud feed inlet A1, a water inlet A2, a stirrer motor A3, a stirring shaft A4, an acidolysis liquid outlet coil A5, a stirrer A6, an acidolysis red mud slurry thickening outlet A7 and an outlet A8, wherein the acidolysis red mud slurry thickening outlet A7 and the outlet A8 are respectively located at the lower end and the bottom of the inner cavity of the acidolysis tower 1, the red mud feed inlet A1 and the water inlet A2 are respectively located on both sides of the upper end of the acidolysis tower 1, the acidolysis liquid outlet coil A5 is fixedly installed at the upper end of the inner cavity of the acidolysis tower 1, the stirrer motor A3 is fixedly installed at the top of the acidolysis tower 1, the stirring shaft A4 is located on the inner side of the acidolysis tower 1, and the upper end of the stirring shaft A4 is fixedly connected to the output end of the stirrer motor A3 through a coupling, and the stirrer A6 is fixedly installed at the lower end of the outer surface of the stirring shaft A4.

[0041] Specifically, the bubbling ventilation disk 15 includes an outer ring bubbling disk B1, a middle ring bubbling disk B2 and an inner ring bubbling disk B3 from the outside to the inside. The tops of the outer ring bubbling disk B1, the middle ring bubbling disk B2 and the inner ring bubbling disk B3 are all provided with controllable size bubbling holes B4, which can adjust the size of the bubbling holes and control the CO2 bubbling size. The bubbling ventilation disk 15 is connected to the CO2 ventilation system 6 to control the bubbling frequency of CO2.

[0042] Specifically, a solid-liquid separation pump 18 is provided at one end of the solid-liquid separation controller 19 .

[0043] Specifically, the carbonized slag 21 is arranged inside the slag pool 20 , and the acid hydrolysis red mud slurry 2 is arranged inside the acid hydrolysis pool 3 .

[0044] Specifically, the medium-sized stirring paddle 12 and the large-sized stirring paddle 14 stir clockwise, and the small-sized stirring paddle 13 stirs counterclockwise, and the stirring rates of the medium-sized stirring paddle 12 , the small-sized stirring paddle 13 and the large-sized stirring paddle 14 are all independently controlled.

[0045] Specifically, the overflow compression control box 7 includes three automatic controllers: a pressurized air intake controller, which is activated when the gas pressure is insufficient; a decompression air outlet controller, which is activated when the gas pressure exceeds the limit; and a pressure relief safety controller, which is activated when the decompression air outlet controller fails.

[0046] The technical scheme of the present invention: The order of Bayer red mud treatment is as follows: the Bayer red mud is selectively acidified by industrial waste acid in the acidolysis tank 3, and the acidolysis red mud is pumped into the air circulation bubbling tower 22. The air circulation bubbling tower 22 obtains carbon-activated red mud slurry by suspending, temperature controlling, and bubbling carbonization of the acidolysis red mud. The carbon-activated red mud slurry is subjected to solid-liquid separation by a solid-liquid separation controller 19. The solid-liquid separation controller 19 is a solid-liquid separation device, which converts the carbon-activated red mud slurry into carbonized slag 21 and sends it into the slag pool 20. The unreacted CO2 enters the overflow compression control box 7 through the circulating air flow pipe 8, and then is transferred to the CO2 intake system 6 to realize the gas phase recycling of the air circulation bubbling tower 22, thereby realizing the effective comprehensive utilization of industrial waste acid, industrial metallurgical solid waste slag Bayer red mud, and industrially generated CO2, and efficiently carbon-activating the Bayer red mud to improve the resource utilization rate of the Bayer red mud.

[0047] A method for efficiently activating the carbonization bubbling of Bayer red mud, the method comprising the following steps:

[0048] S1: 100 parts of industrial waste acid and 30 parts of Bayer red mud were weighed, and red mud slurry with a water-cement ratio of 3-5:1 was prepared according to the ratio, and acidolysis solutions with concentrations of 35, 50, and 100 g / L were prepared according to the acidolysis solution concentration requirements;

[0049] S2: Pump the red mud slurry to the air circulation bubbling tower 22, and dilute the red mud slurry in the tower with water to 100 g / L;

[0050] S3: Start the CO2 intake system 6 to introduce CO2 into the air circulation bubbling tower 22, and control the ventilation flow rate to 0.5, 1, 1.5, 2 L / min and the bubble size (fine, fine, normal) through the bubbling ventilation disk 15;

[0051] S4: Start the temperature controller 17 of the bubbling tower, and control the carbonization reaction environment temperature of the bubbling tower to 10, 15, 30, and 70° C.;

[0052] S5: Start the three-stage stirring system of the medium-sized stirring paddle 12, the small-sized stirring paddle 13 and the large-sized stirring paddle 14 of the bubble tower and the pulse spoiler 16, and adjust the frequency level (large, medium and small);

[0053] S5: The unreacted CO2 in the carbonization process is introduced into the overflow compression control box 7 through the circulating gas flow pipe 8 at the top of the bubbling tower, and finally introduced into the CO2 intake system 6;

[0054] S6: The carbonization reaction is carried out for 1, 2, or 3 hours. After the reaction is completed, the generated carbonized red mud slurry is separated into solid and liquid through a solid-liquid separation controller 19 to recover the carbonized slag 21.

[0055] The carbonized red mud obtained by the method of the present invention can be directly applied to the fields of building materials such as cementitious materials, roadbeds, brick blocks, and plates.

[0056] The raw material Bayer red mud used in the embodiment of the present invention is taken from an alumina production plant in Qingzhen City, Guizhou Province. The raw industrial waste acid for preparing the acidolysis solution comes from the industrial by-product waste sulfuric acid of the Dongfeng Power Plant in Guiyang City. The CO2 used is the industrial CO2 produced and purified and recovered by the Dongfeng Power Plant in Guiyang City. The chemical composition of the Bayer red mud is analyzed by an X-ray fluorescence spectrometer (XRF-ZSX PrimuⅢ+), as shown in Table 1:

[0057] Table 1:

[0058]

[0059] Embodiment 1

[0060] A carbonization bubbling system and method for efficiently activating Bayer red mud, the steps are as follows:

[0061] 100 parts of industrial waste acid and 30 parts of Bayer red mud were weighed at the same time, and the weighed Bayer red mud and water were placed in the acidolysis tower 1 at a water-cement ratio of 3:1. At the same time, an acidolysis solution with a concentration of 50 g / L was prepared, and the agitator A6 was started, and the stirring rate was set to 300 r / min. The stirring was stopped after 10 minutes of low-speed stirring, and the stirring rate was set to 600 r / min. The agitator A6 was started, and the configured acidolysis solution was introduced into the acidolysis solution outlet coil while stirring. The stirring was continued for 3 hours and then stopped. The Bayer red mud that had fully reacted with acidolysis was quietly thickened and finally entered the acidolysis tank 3 through the discharge port A8.

[0062] The acid-hydrolyzed red mud slurry in the acidolysis tank 3 is pumped into the air circulation carbonization ring bubbling tower 22 by connecting the red mud slurry pumping pipeline through a suction pump, water is added to the tower, the red mud slurry to be reacted is diluted to 100 g / L, the CO2 air intake system 6 is started, CO2 is introduced into the bubbling ventilation disk 15, the CO2 ventilation flow rate of the bubbling ventilation disk 15 is adjusted to 1 L / min, the bubble size is fine, the temperature controller 17 is started, the carbonization reaction temperature is adjusted to 15°C, the three-stage stirring system is started, the stirring speed is medium, the reaction time is 3 hours, and finally the carbonized red mud slurry is obtained.

[0063] The obtained carbonized red mud slurry is subjected to solid-liquid analysis through solid-liquid separation control 19 to obtain the final product carbonized slag 21.

[0064] Technical control parameters during the reaction process:

[0065] The water-cement ratio of the acid-hydrolyzed red mud slurry is 3:1, and the concentration of the acid-hydrolyzed liquid is 50g / L;

[0066] The speed of the agitator A6 of the acid hydrolysis tower 1 is 300 r / min at low speed and 600 r / min at high speed;

[0067] The reaction time of acid hydrolysis of red mud is 3h;

[0068] The carbonization flow rate of the bubble tower was 1 L / min, the carbonization temperature was 15°C, and the carbonization reaction time was 3 h.

[0069] The red mud carbonization rate is 52%, and the activity of carbonized Bayer red mud is increased by 47.2%.

[0070] Embodiment 2

[0071] 100 parts of industrial waste acid and 25 parts of Bayer red mud were weighed at the same time, and the weighed Bayer red mud and water were placed in the acidolysis tower 1 at a water-cement ratio of 5:1. At the same time, an acidolysis solution with a concentration of 35 g / L was prepared, and the agitator A6 was started, and the stirring rate was set to 300 r / min. The stirring was stopped after 10 minutes of low-speed stirring. The stirring rate was set to 600 r / min, and the agitator A6 was started. While stirring, the configured acidolysis solution was introduced into the acidolysis solution outlet coil. The stirring was continued for 2 hours and then stopped. The Bayer red mud that had fully reacted in the acidolysis reaction was quietly thickened and finally entered the acidolysis tank 3 through the discharge port A8.

[0072] The acid-hydrolyzed red mud slurry in the acidolysis tank 3 is pumped into the air circulation carbonization ring bubbling tower 22 by connecting the red mud slurry pumping pipeline through a suction pump, water is added to the tower, the red mud slurry to be reacted is diluted to 100 g / L, the CO2 intake system 6 is started, CO2 is introduced into the bubbling ventilation disk 15, the CO2 ventilation flow rate of the bubbling ventilation disk 15 is adjusted to 2 L / min, the bubble size is fine, the temperature controller 17 is started, the carbonization reaction temperature is adjusted to 30°C, the three-stage stirring system is started, the stirring speed is medium, the reaction time is 3h, and finally the carbonized red mud slurry is obtained.

[0073] The obtained carbonized red mud slurry is subjected to solid-liquid analysis through solid-liquid separation control 19 to obtain the final product carbonized slag 21.

[0074] Technical control parameters during the reaction process:

[0075] The water-cement ratio of the acid-hydrolyzed red mud slurry is 5:1, and the concentration of the acid-hydrolyzed liquid is 35g / L;

[0076] Acid hydrolysis tower agitator speed: low speed 300r / min, high speed 600r / min;

[0077] The reaction time of acid hydrolysis of red mud is 2h;

[0078] The carbonization flow rate of the bubble tower was 2 L / min, the carbonization temperature was 30°C, and the carbonization reaction time was 3 h.

[0079] The red mud carbonization rate is 46%, and the activity of carbonized Bayer red mud is increased by 39.8%.

[0080] Embodiment 3

[0081] 100 parts of industrial waste acid and 25 parts of Bayer red mud were weighed at the same time, and the weighed Bayer red mud and water were placed in the acidolysis tower 1 at a water-cement ratio of 3:1. At the same time, an acidolysis solution with a concentration of 100 g / L was prepared, and the agitator A6 was started, and the stirring rate was set to 300 r / min. The stirring was stopped after 10 minutes of low-speed stirring. The stirring rate was set to 600 r / min, and the agitator A6 was started. While stirring, the configured acidolysis solution was introduced into the acidolysis solution outlet coil. The stirring was continued for 1 hour and then stopped. The Bayer red mud that had fully reacted in the acidolysis reaction was quietly thickened and finally entered the acidolysis tank 3 through the discharge port A8.

[0082] The acid-hydrolyzed red mud slurry in the acidolysis tank 3 is pumped into the air circulation carbonization ring bubbling tower 22 by connecting the red mud slurry pumping pipeline through a suction pump, water is added to the tower, the red mud slurry to be reacted is diluted to 100g / L, the CO2 air intake system 6 is started, CO2 is introduced into the bubbling ventilation disk 15, the CO2 ventilation flow rate of the bubbling ventilation disk 15 is adjusted to 1.5L / min, the bubble size is fine, the temperature controller 17 is started, the carbonization reaction temperature is adjusted to 10°C, the three-stage stirring system is started, the stirring speed is medium, the reaction time is 2h, and finally the carbonized red mud slurry is obtained.

[0083] The obtained carbonized red mud slurry is controlled by solid-liquid separation, 19 solid-liquid analysis is performed to obtain the final product carbonized slag 21.

[0084] Technical control parameters during the reaction process:

[0085] The water-cement ratio of the acid-hydrolyzed red mud slurry is 3:1, and the concentration of the acid-hydrolyzed solution is 100g / L;

[0086] Acid hydrolysis tower agitator speed: low speed 300r / min, high speed 600r / min;

[0087] The reaction time of acid hydrolysis of red mud is 1h;

[0088] The carbonization flow rate of the bubble tower was 1.5 L / min, the carbonization temperature was 10°C, and the carbonization reaction time was 2 h.

[0089] The red mud carbonization rate was 61.5%, and the activity of carbonized Bayer red mud increased by 55.9%.

[0090] Embodiment 4

[0091] 100 parts of industrial waste acid and 25 parts of Bayer red mud were weighed at the same time, and the weighed Bayer red mud and water were placed in the acidolysis tower 1 at a water-cement ratio of 3:1. At the same time, an acidolysis solution with a concentration of 50 g / L was prepared, and the agitator A6 was started, and the stirring rate was set to 300 r / min. The low-speed stirring was stopped for 10 min, and the stirring was set to 600 r / min. The agitator A6 was started, and the configured acidolysis solution was introduced into the acidolysis solution outlet coil while stirring. The stirring was continued for 1 hour and then stopped. The Bayer red mud that had fully reacted in the acidolysis reaction was quietly thickened and finally entered the acidolysis tank 3 through the discharge port A8.

[0092] The acid-hydrolyzed red mud slurry in the acidolysis tank 3 is pumped into the air circulation carbonization ring bubbling tower 22 by connecting the red mud slurry pumping pipeline through a suction pump, water is added to the tower, the red mud slurry to be reacted is diluted to 100 g / L, the CO2 air intake system 6 is started, CO2 is introduced into the bubbling ventilation disk 15, the CO2 ventilation flow rate of the bubbling ventilation disk 15 is adjusted to 1.5 L / min, the bubble size is fine, the temperature controller 17 is started, the carbonization reaction temperature is adjusted to 70°C, the three-stage stirring system is started, the stirring speed is medium, the reaction time is 3 hours, and finally the carbonized red mud slurry is obtained.

[0093] The obtained carbonized red mud slurry is subjected to solid-liquid analysis through solid-liquid separation control 19 to obtain the final product carbonized slag 21.

[0094] Technical control parameters during the reaction process:

[0095] The water-cement ratio of the acid-hydrolyzed red mud slurry is 3:1, and the concentration of the acid-hydrolyzed liquid is 50g / L;

[0096] Acid hydrolysis tower agitator speed: low speed 300r / min, high speed 600r / min;

[0097] The reaction time of acid hydrolysis of red mud is 1h;

[0098] The carbonization flow rate of the bubble tower was 1.5 L / min, the carbonization temperature was 70°C, and the carbonization reaction time was 3 h.

[0099] The red mud carbonization rate was 53.6%, and the activity of carbonized Bayer red mud increased by 49.1%.

[0100] Based on the above Examples 1-4, the red mud carbonization rate and the improvement of the activity of carbonized Bayer red mud can be intuitively understood, so that the present invention can further realize the effective comprehensive utilization of industrial waste acid, industrial metallurgical solid waste Bayer red mud, and industrial CO2, and efficiently carbon activate Bayer red mud to improve the resource utilization rate of Bayer red mud.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A carbonization bubbling system for efficiently activating Bayer red mud, comprising an acid hydrolysis tower (1), an acid hydrolysis tank (3), a CO2 intake system (6), an overflow compression control box (7), a circulating air flow pipe (8), a solid-liquid separation controller (19), a slag pool (20) and an air circulation bubbling tower (22), characterized in that: The acid hydrolysis tower (1) is connected to the acid hydrolysis tank (3) through a delivery pump. The acid hydrolysis tank (3) is provided with a red mud slurry pumping pipeline (4) which is connected to the air circulation bubbling tower (22) through a delivery pump. The top of the air circulation bubbling tower (22) is provided with an overflow filter (10). The circulating air flow pipe (8) is arranged at the upper end of the air circulation bubbling tower (22), and one end of the circulating air flow pipe (8) is connected to the top of the overflow filter (10). The overflow compression control box (7) is connected to one end of the circulating air flow pipe (8) away from the air circulation bubbling tower (22). The overflow compression control box (7) is connected to the CO2 intake system (6) through a pipeline. The solid-liquid separation controller (19) is connected to the air circulation bubbling tower (22) through a pipeline. The slag discharge pipe of the solid-liquid separation controller (19) extends into the slag pool (20). The outer A temperature controller (17) is arranged on the side, a bubbling ventilation disk (15) is fixedly installed at the bottom of the inner cavity of the air circulation bubbling tower (22), a plurality of pulse spoilers (16) distributed at equal angles are fixedly installed on the inner wall of the air circulation bubbling tower (22), and the pulse frequency of the pulse spoiler (16) is controlled in two levels, large and small, a plurality of pulse emission holes (C1) are arranged on one side of the pulse spoiler (16), a rotating shaft motor (9) is fixedly installed on the top of the air circulation bubbling tower (22), the output end of the rotating shaft motor (9) is fixedly connected to a rotating shaft (11), and a medium-sized stirring paddle (12), a small stirring paddle (13) and a large stirring paddle (14) are fixedly installed on the outer surface of the rotating shaft (11) in sequence from top to bottom, and a carbon dioxide gas supply pipeline (5) is connected between the lower end of the CO2 intake system (6) and the bottom of the bubbling ventilation disk (15).

2. The carbonization bubbling system for efficiently activating Bayer red mud according to claim 1, characterized in that: The acid hydrolysis tower (1) comprises a red mud feed inlet (A1), a water inlet (A2), a stirrer motor (A3), a stirring shaft (A4), an acid hydrolysis liquid outlet coil (A5), a stirrer (A6), an acid hydrolysis red mud slurry thickening outlet (A7) and an outlet (A8), wherein the acid hydrolysis red mud slurry thickening outlet (A7) and the outlet (A8) are respectively located at the lower end and the bottom of the inner cavity of the acid hydrolysis tower (1), and the red mud feed inlet (A1) and the water inlet (A2) are respectively located at the lower end and the bottom of the inner cavity of the acid hydrolysis tower (1). Located on both sides of the upper end of the acidolysis tower (1), the acidolysis liquid outlet coil (A5) is fixedly installed at the upper end of the inner cavity of the acidolysis tower (1), the stirrer motor (A3) is fixedly installed at the top of the acidolysis tower (1), the stirring shaft (A4) is located on the inner side of the acidolysis tower (1), and the upper end of the stirring shaft (A4) is fixedly connected to the output end of the stirrer motor (A3) through a coupling, and the stirrer (A6) is fixedly installed at the lower end of the outer surface of the stirring shaft (A4).

3. The carbonization bubbling system for efficiently activating Bayer red mud according to claim 1, characterized in that: The bubbling ventilation disk (15) includes an outer ring bubbling disk (B1), a middle ring bubbling disk (B2) and an inner ring bubbling disk (B3) from the outside to the inside. The tops of the outer ring bubbling disk (B1), the middle ring bubbling disk (B2) and the inner ring bubbling disk (B3) are all provided with controllable size bubbling holes (B4), which can adjust the size of the bubbling holes and control the CO2 bubbling size. The bubbling ventilation disk (15) is connected to the CO2 ventilation system (6) to control the bubbling frequency of CO2.

4. The carbonization bubbling system for efficiently activating Bayer red mud according to claim 1, characterized in that: A solid-liquid separation pump (18) is provided at one end of the solid-liquid separation controller (19).

5. The carbonization bubbling system for efficiently activating Bayer red mud according to claim 1, characterized in that: Carbonized slag (21) is arranged inside the slag pool (20), and acid-decomposed red mud slurry (2) is arranged inside the acid-decomposed pool (3).

6. The carbonization bubbling system for efficiently activating Bayer red mud according to claim 1, characterized in that: The medium-sized stirring paddle (12) and the large-sized stirring paddle (14) stir clockwise, and the small-sized stirring paddle (13) stirs counterclockwise, and the stirring rates of the medium-sized stirring paddle (12), the small-sized stirring paddle (13) and the large-sized stirring paddle (14) are all independently controlled.

7. The carbonization bubbling system for efficiently activating Bayer red mud according to claim 1, characterized in that: The overflow compression control box (7) comprises three automatic controllers: a pressurized air intake controller, which is activated when the gas pressure is insufficient; a decompressed air outlet controller, which is activated when the gas pressure exceeds the limit; and a pressure relief safety controller, which is activated when the decompressed air outlet controller fails.

8. A method for efficiently activating the carbonization bubbling of Bayer red mud according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: S1: Measure 100 parts of industrial waste acid, prepare acid solution of a certain concentration as required, weigh 20-30 parts of Bayer red mud, and mix it with water at a fixed solid-liquid ratio to form red mud slurry as required; S2: pumping the acid-hydrolyzed red mud to an air circulation bubbling tower (22); S3: The CO2 inlet system (6) delivers CO2 to the bottom of the tower through a gas flow pipe connected to the bubbling vent plate (15), and controls the vent hole size and ventilation flow rate of the bubbling vent plate 15 to achieve control of the CO2 flow rate and bubble size; S4: starting the temperature controller (17) of the bubbling tower, and regulating the critical solubility of CO2 in the aqueous solution by the ambient temperature of the bubbling tower, thereby improving the carbonization reaction efficiency of Bayer red mud; S5: starting the three-stage stirring system of the medium-sized stirring paddle (12), the small-sized stirring paddle (13) and the large-sized stirring paddle (14) of the bubbling tower and the pulse spoiler (16) to adjust the uniformity of the Bayer red mud suspended particles in the solution and increase the carbonization reaction contact area of ​​the particles; S5: The unreacted CO2 in the carbonization process is introduced into the overflow compression control box (7) through the circulating gas flow pipe (8) at the top of the bubbling tower, and finally introduced into the CO2 intake system (6) to be recycled for the bubbling carbonization reaction; S6: The generated carbonized red mud slurry is subjected to solid-liquid separation through a solid-liquid separation controller (19) to recover the carbonized slag (21).

9. The method for carbonization bubbling of Bayer red mud according to claim 8, characterized in that: The industrial waste acid in step S1 is titanium dioxide waste acid and waste sulfuric acid. The ratio of red mud treated in the acidolysis tank (3) to water is in the range of 1:3-1:5, and the concentration of the acidolysis solution is 35g / L, 50g / L, and 100g / L.

10. The carbonization bubbling system and method for efficiently activating Bayer red mud according to claim 8, characterized in that: The gas used in the CO2 intake system (6) is industrially purified carbon dioxide, and the red mud slurry entering the air circulation bubbling tower (22) is diluted with water and the concentration is controlled to be 100 g / L.

Images