CN117430302A - Red mud dealkalization system and process - Google Patents
Red mud dealkalization system and process Download PDFInfo
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- CN117430302A CN117430302A CN202311668219.4A CN202311668219A CN117430302A CN 117430302 A CN117430302 A CN 117430302A CN 202311668219 A CN202311668219 A CN 202311668219A CN 117430302 A CN117430302 A CN 117430302A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000008569 process Effects 0.000 title claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 238000003756 stirring Methods 0.000 claims abstract description 29
- 239000002002 slurry Substances 0.000 claims abstract description 27
- 239000006260 foam Substances 0.000 claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 238000005086 pumping Methods 0.000 claims abstract description 14
- 238000004062 sedimentation Methods 0.000 claims abstract description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 20
- 239000003546 flue gas Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 238000000926 separation method Methods 0.000 claims description 11
- 230000000712 assembly Effects 0.000 claims description 9
- 238000000429 assembly Methods 0.000 claims description 9
- 238000002955 isolation Methods 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 239000000779 smoke Substances 0.000 claims description 5
- 238000007667 floating Methods 0.000 claims description 4
- 238000005338 heat storage Methods 0.000 claims description 4
- 239000011268 mixed slurry Substances 0.000 abstract description 2
- 230000002441 reversible effect Effects 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000003860 storage Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Abstract
The invention discloses a red mud dealkalization system and a process, which relate to the technical field of red mud treatment and comprise the following steps: positioning a base; the dealkalization tower consists of a tank body and a tank cover, wherein the tank cover is connected with the crushing and mixing mechanism, and the tank body is respectively connected with a circulating pump, a pumping pump and an air pump; the sedimentation tank is communicated with the discharge pump, and the discharge pump is connected with the lower end of the tank body; the dealkalization system is characterized in that the dealkalization system is firstly mixed in a first cavity and a second cavity through liquid level difference, red mud slurry is added into the first cavity, the red mud slurry in the first cavity continuously flows to the second cavity along a second valve body to be mixed secondarily, the reverse high-low speed rotation of two groups of stirring and mixing components is utilized to control foam bodies to be carried away to a foam removing disc to be separated, and the mixed slurry in the high-speed state is deflected up and down in the first cavity and the second cavity by the first turbulence disc and the second turbulence disc to circularly flow and be stirred for three times to be mixed.
Description
Technical Field
The invention relates to the technical field of red mud treatment, in particular to a red mud dealkalization system and a red mud dealkalization process.
Background
Red mud is used for extracting Al from aluminum production industry 2 O 3 And (5) discharging the strong alkaline solid waste. The main alkaline matter is red mud mainly containing CaO and Na 2 O and other components, the appearance of which is similar to that of red mud, so the red mud is called red mud. Due to the differences of ore grade, production method and technical level, about 1.0 to 1.8 tons of red mud are discharged per 1 ton of alumina produced. China is used as a large country for alumina production, and as the stockpiling amount of red mud is larger and the pollution to the environment is more serious, the red mud is utilized to the maximum extent and is not suitable for being etchedAnd (5) slowing.
The prior Chinese patent with publication number of CN 114432997A discloses a device and a method for suspension carbonization and dealkalization of flue gas red mud, which adopts CO in flue gas or industrial tail gas under the action of microwaves 2 Suspension carbonization dealkalization is carried out on the red mud, but CO is introduced into the suspension carbonization dealkalizer 2 First with water and then with NaOH or Ca (OH) 2 The reaction, the heat release after the hydrolysis of the alkaline substance leads to the water dissolution and the volatilization (CO) of the smoke 2 And H is 2 The reaction of O is reversible), the reaction period is longer, the cloth mixing effect is poor, foam in the interior cannot be effectively removed, and NaCO generated after the reaction is completed 3 Is strong alkali weak acid salt, wet red mud CO 2- 3 And remains alkaline after ionization.
Therefore, it is necessary to provide a red mud dealkalization system and process to solve the above-mentioned problems in the background art.
Disclosure of Invention
In order to achieve the above purpose, the present invention provides the following technical solutions: a red mud dealkalization system and process, comprising:
the dealkalization tower consists of a tank body and a tank cover, wherein the tank cover is connected with the crushing and mixing mechanism, and the tank body is respectively connected with a circulating pump, a pumping pump and an air pump; and the sedimentation tank is communicated with the discharge pump, and the discharge pump is connected with the lower end of the tank body.
Further, preferably, the dealkalizer comprises:
the feed inlet and the water inlet are arranged on the tank cover, and the feed inlet is communicated with the crushing and mixing mechanism;
the separation port is communicated with the pumping pump, the smoke inlet is communicated with the circulating pump, and the air inlet is communicated with an air pump arranged outside;
the discharge port is fixedly arranged at the lower end of the tank body and is communicated with the discharge pump;
the power mechanism is fixedly arranged in the tank cover and drives the two groups of stirring and mixing components arranged in the tank body to reversely rotate.
Further, as the preference, still include in the dealkalization tower the jar internal circumference encloses the heat storage layer that establishes and jar body axis on fixed isolation layer, the entry of separating mouth is the recess shape, and its run through circumference set up in the heat storage layer, the isolation layer will jar internal partition is two cavities: the first chamber is communicated with the air inlet, and the second chamber is communicated with the separation port and the flue gas inlet.
Further, preferably, the separation opening is provided at a height greater than a height of the flue gas inlet provided at the circumferential side of the tank.
Further, preferably, two through holes are formed in the isolation layer, the through holes can be communicated with the first chamber and the second chamber, and a first valve body and a second valve body are arranged in the corresponding through holes.
Further, preferably, the stirring and mixing assemblies of both groups have the same structure, and each comprises:
the central shaft is driven by the power mechanism, a guide rod is connected inside the central shaft through a telescopic spring, the lower end of the guide rod is fixed inside the tank body, and a foam removing disc, a first turbulence disc and a second turbulence disc are sequentially fixed on the central shaft from top to bottom;
and stirring blades which are arranged outside the central shaft.
Further, preferably, the first spoiler initial position is flush with the first valve body, and the second spoiler initial position is flush with the second valve body.
Further, preferably, the foam removing disc, the first turbulence disc and the second turbulence disc have the same internal structure, and the inside of the foam removing disc is provided with a through flow guiding hole, and the diameter of the foam removing disc is larger than that of the first turbulence disc and the second turbulence disc.
The technological method of the red mud dealkalization system comprises the following steps:
s1, firstly, crushing red mud in a crushing and mixing mechanism, and then adding a proper amount of water to prepare red mud slurry;
s2, closing a first valve body, a second valve body, a separating port, an air inlet and a discharging port, feeding red mud slurry into a first cavity through a feeding port and 5-10cm higher than the second valve body, synchronously firstly opening a water inlet to supply water into the second cavity, then opening a circulating pump and a flue gas inlet to slowly supply flue gas into the second cavity, so that the height of liquid in the second cavity is higher than that of the first valve body and lower than that of the separating port, and generating gas-liquid reaction in the second cavity;
s3, opening a second valve body, enabling liquid in the second chamber to flow into the first chamber for primary mixing due to liquid level difference, continuously supplying red mud slurry into the first chamber, continuously flowing the red mud slurry into the second chamber through the second valve body for secondary mixing, and stopping supplying the liquid when the liquid levels in the first chamber and the second chamber are level and are lower than the height of the separating opening;
s4, opening the first valve body and the separating opening, starting the air pump, the pumping pump and the stirring and mixing assembly, generating gas-liquid reaction in the first chamber and the second chamber, and removing floating foam by the stirring and mixing assembly under a low-speed state through the cooperation of the pumping pump and the foam removing disc; the two groups of stirring and mixing components reversely rotate in a high-speed state, and the liquid in the first chamber and the liquid in the second chamber are fully mixed under the action of the first spoiler and the second spoiler;
s5, after mixing is completed, a discharge port and a discharge pump are opened, and the red mud slurry with alkali removed is pumped out to a sedimentation tank for sedimentation.
Compared with the prior art, the invention provides a red mud dealkalization system and a red mud dealkalization process, which have the following beneficial effects:
in the invention, the tank body is divided into the first chamber and the second chamber, the red mud and the flue gas are respectively in different chambers and can synchronously react and then be mixed, so that the water solubility of the flue gas is prevented from being influenced by the hydrolysis heat release of alkaline substances, and the timeliness of the reaction is improved;
according to the dealkalization system, the first chamber and the second chamber are initially mixed through liquid level difference, red mud slurry is added into the first chamber, the red mud slurry in the first chamber continuously flows to the second chamber along the second valve body to be mixed for the second time, the two groups of stirring and mixing components rotate at high and low speeds in opposite directions, foam bodies are controlled to be carried away to a foam removing disc by means of low speed to be separated, and the mixed slurry in the high-speed state is deflected up and down in the first turbulence disc and the second turbulence disc to circularly flow in the first chamber and the second chamber and is stirred for the third time to be mixed.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a red mud dealkalization system;
FIG. 2 is a schematic diagram of the internal sectional structure of a dealkalization tower in a red mud dealkalization system;
FIG. 3 is a schematic structural diagram of a stirring and mixing assembly in a red mud dealkalization system;
FIG. 4 is a schematic diagram of the internal cross-section of a stirring and mixing assembly in a red mud dealkalization system;
FIG. 5 is a schematic diagram of the internal cross-sectional structure of a de-foaming tray in a red mud dealkalization system;
FIG. 6 is a schematic diagram of the internal slurry reflux distribution of a red mud dealkalization system;
in the figure: 1. a crushing and mixing mechanism; 2. a dealkalization tower; 20. a tank body; 21. a can lid; 22. a feed inlet; 23. a discharge port; 24. a separation port; 25. a flue gas inlet; 26. an intake air inlet; 27. a thermal storage layer; 28. an isolation layer; 281. a first valve body; 282. a second valve body; 29. stirring and mixing the components; 210. a water inlet; 291. a central shaft; 292. a guide rod; 293. a telescopic spring; 294. stirring the leaves; 295. a despumation tray; 2951. a deflector aperture; 296. a first spoiler; 297. a second spoiler; 3. a circulation pump; 4. a pump; 5. an air pump; 6. a discharge pump; 7. and (3) a sedimentation tank.
Detailed Description
Referring to fig. 1 to 6, in an embodiment of the present invention, a red mud dealkalization system includes:
the dealkalization tower 2 is composed of a tank body 20 and a tank cover 21, wherein the tank cover 21 is connected with the crushing and mixing mechanism 1, and the tank body 20 is respectively connected with a circulating pump 3, a pumping pump 4 and an air pump 5; the sedimentation tank 7 is communicated with the discharge pump 6, and the discharge pump 6 is connected with the lower end of the tank body 20;
it should be noted that SO is discharged from a thermal power plant, nonferrous metal smelter, sulfuric acid plant, oil refinery, industrial furnaces for burning coal or oil, etc 2 SO is generated in flue gas, fossil combustion process, roasting and smelting of sulfide ore and other thermal processes 2 The aluminum industry can select to cooperate with related factories to treat SO 2 And alkaline substances in the red mud.
Referring to fig. 2, the dealkalizer 2 includes:
a feed inlet 22 and a water inlet 210 which are arranged on the tank cover 21, wherein the feed inlet 22 is communicated with the crushing and mixing mechanism 1;
the separation port 24 is communicated with the pumping pump 4, the smoke inlet 25 is communicated with the circulating pump 3, and the air inlet 26 is communicated with an air pump 5 arranged outside;
the discharge hole 23 is fixedly arranged at the lower end of the tank body 20, and the discharge hole 23 is communicated with the discharge pump 6;
the power mechanism is fixedly arranged in the tank cover 21, and drives the two groups of stirring and mixing assemblies 29 arranged in the tank body 20 to reversely rotate.
Referring to fig. 2, as a preferred embodiment, the dealkalization tower 2 further includes a thermal storage layer 27 circumferentially surrounding the interior of the tank 20 and an isolation layer 28 fixed on the axis of the tank 20, the inlet of the separation port 24 is in a groove shape, and the separation layer 28 penetrates through the thermal storage layer 27 and circumferentially opens into the interior of the tank 20, and the isolation layer 28 divides the interior of the tank 20 into two chambers: a first chamber, a second chamber, and the first chamber is in communication with the air inlet 26, and the second chamber is in communication with the separation port 24 and the flue gas inlet 25;
the chemical reaction equation that occurs in the first chamber and the pulverizing and mixing mechanism 1 is:
CaO+H 2 O＝Ca(OH) 2
Na 2 O+H 2 O＝NaOH
because the main alkaline substances contained in the red mud are CaO and Na contained in the red mud 2 O and other components, caO and Na 2 O is prone to water reactions and releases heat during the reaction, and the thermal storage layer 27 is able to store heat efficiently, facilitating the heating of other endothermic reactions.
As a preferred embodiment, the height of the separating opening 24 arranged on the circumferential side surface of the tank body 20 is greater than the height of the flue gas inlet 25 arranged on the circumferential side surface of the tank body 20, SO that SO is facilitated 2 The reaction with water is carried out from the bottom, and the reaction equation is as follows:
SO 2 and H 2 O reacts first in the second chamber to form weak acid H 2 SO 3 。
As a preferred embodiment, the isolation layer 28 is provided with two through holes, the through holes can be communicated with the first chamber and the second chamber, and a first valve body 281 and a second valve body 282 are arranged in the corresponding through holes;
firstly, red mud is crushed in the crushing and mixing mechanism 1, then a proper amount of water is added to prepare red mud slurry, the red mud slurry is fed into the first cavity through the feed inlet 22 and is 5-10cm higher than the second valve body 282, the water inlet 210 is synchronously opened firstly to feed water into the second cavity, then the circulating pump 3 and the flue gas inlet 25 are opened to slowly feed flue gas into the second cavity, the height of liquid in the second cavity is higher than that of the first valve body 281 and is lower than that of the separating opening 24, then the second valve body 282 is opened, the liquid in the second cavity flows into the first cavity for primary mixing due to liquid level difference, and the red mud slurry is continuously fed into the first cavity through the second valve body 282 to flow to the second cavity for secondary mixing.
Referring to fig. 3 and 4, in this embodiment, the two sets of stirring and mixing assemblies 29 have the same structure, and each set of stirring and mixing assemblies includes:
a central shaft 291 driven by a power mechanism, wherein a guide rod 292 is connected to the inside of the central shaft 291 through a telescopic spring 293, the lower end of the guide rod 292 is fixed in the tank 20, and a foam removing disc 295, a first turbulence disc 296 and a second turbulence disc 297 are sequentially fixed on the central shaft 291 from top to bottom;
a stirring vane 294 disposed outside the central shaft 291;
it should be noted that the stirring and mixing assembly 29 can be divided into two rotation states: low speed and high speed; the two groups of stirring and mixing assemblies 29 rotate at a low speed, and the foam removing disc 295 is matched with the pumping pump 4 to remove floating foam; when the two sets of stirring and mixing assemblies 29 are rotated reversely at a high speed, the liquids in the first chamber and the second chamber are fully mixed under the action of the first spoiler 296 and the second spoiler 297.
As a preferred embodiment, the initial position of the first spoiler 296 is flush with the first valve body 281, and the initial position of the second spoiler 297 is flush with the second valve body 282, which is beneficial to spoiler the slurry inside the first spoiler 296 and the second spoiler 297 in the process of rotating up and down at high speed, so that the slurry can circulate in two chambers, as shown in fig. 6.
Referring to fig. 5, as a preferred embodiment, the inner structures of the foam removing disc 295, the first turbulence disc 296 and the second turbulence disc 297 are the same, through flow guiding holes 2951 are formed in the inner parts of the foam removing disc 295, and the diameter of the foam removing disc 295 is larger than that of the first turbulence disc 296 and the second turbulence disc 297, so that the foam can be effectively removed from the inner part of the tank 20 through the flow guiding holes 2951 when the stirring and mixing assembly 29 is rotated at a low speed, and the slurry permeability of the first turbulence disc 296 and the second turbulence disc 297 is lower from the flow guiding holes 2951 when the first turbulence disc 296 and the second turbulence disc 297 are rotated at a high speed, thereby generating a better turbulence effect;
the chemical reaction equations in the first and second chambers at this time are as follows:
2NaOH+H 2 SO 3 ＝Na 2 SO 3 +2H 2 O
Ca(OH) 2 +H 2 SO 3 ＝CaSO 3 +2H 2 O
synchronously, the air pump 5 is turned on to supply air, i.e. O, into the first chamber through the air inlet 26 2 The chemical reaction equations in the first and second chambers are as follows:
2Na 2 SO 3 +O 2 ＝2Na 2 SO 4
2CaSO 3 +O 2 ＝2CaSO 4 ↓
after the mixing is completed, a discharge hole 23 is opened, a discharge pump 6 is started, and the red mud slurry with alkali removed is pumped out to a sedimentation tank 7 for sedimentation (generated Na 2 SO 4 Is a strong alkali strong acid salt and is neutral).
The technological method of the red mud dealkalization system comprises the following steps:
s1, firstly, crushing red mud in a crushing and mixing mechanism 1, and then adding a proper amount of water to prepare red mud slurry;
s2, closing a first valve body 281, a second valve body 282, a separating port 24, an air inlet 26 and a discharge port 23, feeding red mud slurry into a first cavity through the feed port 22 and 5-10cm higher than the second valve body 282, synchronously firstly opening a water inlet 210 to feed water into the second cavity, and then opening a circulating pump 3 and a flue gas inlet 25 to slowly feed flue gas into the second cavity, so that the height of liquid in the second cavity is higher than that of the first valve body 281 and lower than that of the separating port 24, and gas-liquid reaction occurs in the second cavity;
s3, opening a second valve body 282, enabling liquid in the second chamber to flow into the first chamber for primary mixing due to liquid level difference, continuously supplying red mud slurry into the first chamber, enabling the red mud slurry to continuously flow into the second chamber through the second valve body 282 for secondary mixing, and stopping liquid supply when the liquid levels in the first chamber and the second chamber are level and are lower than the height of the separating opening 24;
s4, opening the first valve body 281 and the separating opening 24, starting the air pump 5, the pumping pump 4 and the stirring and mixing assembly 29, generating gas-liquid reaction in the first chamber and the second chamber, and removing the floating foam by the stirring and mixing assembly 29 under the low-speed state through the cooperation of the defoaming disc 295 and the pumping pump 4; the two groups of stirring and mixing assemblies 29 reversely rotate under the high-speed state, and the liquid in the first chamber and the liquid in the second chamber are fully mixed under the action of the first spoiler 296 and the second spoiler 297;
s5, after mixing is completed, a discharge hole 23 and a discharge pump 6 are opened, and the red mud slurry with alkali removed is pumped out to a sedimentation tank 7 for sedimentation.
The foregoing description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (9)
1. A red mud dealkalization system, characterized in that it comprises:
the dealkalization tower (2) is composed of a tank body (20) and a tank cover (21), wherein the tank cover (21) is connected with the crushing and mixing mechanism (1), and the tank body (20) is respectively connected with a circulating pump (3), a pumping pump (4) and an air pump (5); and the sedimentation tank (7), wherein the sedimentation tank (7) is communicated with the discharge pump (6), and the discharge pump (6) is connected with the lower end of the tank body (20).
2. The red mud dealkalization system of claim 1, wherein: the dealkalization tower (2) comprises:
a feed inlet (22) and a water inlet (210) which are arranged on the tank cover (21), wherein the feed inlet (22) is communicated with the crushing and mixing mechanism (1);
the separation port (24), the smoke inlet (25) and the air inlet (26) are formed in the circumferential side surface of the tank body (20), the separation port (24) is communicated with the pumping pump (4), the smoke inlet (25) is communicated with the circulating pump (3), and the air inlet (26) is communicated with the air pump (5) arranged outside;
the discharge port (23) is fixedly arranged at the lower end of the tank body (20), and the discharge port (23) is communicated with the discharge pump (6);
the power mechanism is fixedly arranged in the tank cover (21), and drives the two groups of stirring and mixing assemblies (29) arranged in the tank body (20) to reversely rotate.
3. The red mud dealkalization system according to claim 2, wherein the dealkalization tower (2) further comprises a heat storage layer (27) circumferentially surrounded inside the tank body (20) and an isolating layer (28) fixed on the central axis of the tank body (20), the inlet of the separating opening (24) is groove-shaped, and the separating opening penetrates through the circumference and is arranged inside the heat storage layer (27), and the isolating layer (28) divides the inside of the tank body (20) into two chambers: the first chamber is communicated with the air inlet (26), and the second chamber is communicated with the separating opening (24) and the flue gas inlet (25).
4. A red mud dealkalization system according to claim 2, characterized in that the height of the separating opening (24) arranged on the circumferential side of the tank body (20) is larger than the height of the flue gas inlet (25) arranged on the circumferential side of the tank body (20).
5. A red mud dealkalization system according to claim 3, characterized in that two through holes are formed in the isolation layer (28), the through holes can be communicated with the first chamber and the second chamber, and a first valve body (281) and a second valve body (282) are arranged in the corresponding through holes.
6. A red mud dealkalization system as claimed in claim 5, characterized in that both the two groups of stirring and mixing assemblies (29) have the same structure, and both include:
a central shaft (291) driven by the power mechanism, wherein a guide rod (292) is connected inside the central shaft (291) through a telescopic spring (293), the lower end of the guide rod (292) is fixed inside the tank body (20), and a foam removing disc (295), a first turbulence disc (296) and a second turbulence disc (297) are sequentially fixed on the central shaft (291) from top to bottom;
and a stirring blade (294) disposed outside the central shaft (291).
7. The red mud dealkalization system of claim 6, wherein the first spoiler (296) initial position is flush with the first valve body (281), and the second spoiler (297) initial position is flush with the second valve body (282).
8. The red mud dealkalization system of claim 6, wherein the dealkalization disc (295), the first turbulence disc (296) and the second turbulence disc (297) have the same internal structure, the inside of each of the dealkalization disc is provided with a through diversion hole (2951), and the diameter of the dealkalization disc (295) is larger than the diameters of the first turbulence disc (296) and the second turbulence disc (297).
9. A process method of a red mud dealkalization system, which adopts the red mud dealkalization system as claimed in claim 8, and is characterized by comprising the following steps:
s1, firstly, crushing red mud in a crushing and mixing mechanism (1), and then adding a proper amount of water to prepare red mud slurry;
s2, closing a first valve body (281), a second valve body (282), a separating opening (24), an air inlet (26) and a discharge opening (23), feeding red mud slurry into a first cavity through a feed opening (22) and 5-10cm higher than the position of the second valve body (282), synchronously firstly opening a water inlet (210) to feed water into the second cavity, and then opening a circulating pump (3) and a flue gas inlet (25) to slowly feed flue gas into the second cavity, so that the height of liquid in the second cavity is higher than that of the first valve body (281) and lower than that of the separating opening (24), and generating gas-liquid reaction in the second cavity;
s3, opening a second valve body (282), enabling liquid in the second chamber to flow into the first chamber for primary mixing due to liquid level difference, continuously supplying red mud slurry into the first chamber, enabling the red mud slurry to continuously flow into the second chamber through the second valve body (282) for secondary mixing, and stopping supplying liquid when the liquid levels in the first chamber and the second chamber are level and lower than the height of the separating opening (24);
s4, opening a first valve body (281) and a separation port (24), starting an air pump (5), a pumping pump (4) and a stirring and mixing assembly (29), generating gas-liquid reaction in the first chamber and the second chamber, and removing floating foam by the stirring and mixing assembly (29) under a low-speed state through matching a foam removing disc (295) with the pumping pump (4); the two groups of stirring and mixing components (29) reversely rotate at a high speed state, and the liquid in the first chamber and the liquid in the second chamber are fully mixed under the action of the first spoiler (296) and the second spoiler (297);
s5, after mixing is completed, a discharge hole (23) and a discharge pump (6) are opened, and the red mud slurry with alkali removed is pumped out to a sedimentation tank (7) for sedimentation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311668219.4A CN117430302B (en) | 2023-12-07 | Red mud dealkalization system and process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311668219.4A CN117430302B (en) | 2023-12-07 | Red mud dealkalization system and process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117430302A true CN117430302A (en) | 2024-01-23 |
| CN117430302B CN117430302B (en) | 2024-04-23 |
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| ES366375A1 (en) * | 1969-04-23 | 1971-02-01 | Nalco Chemical Co | A procedure to prepare alumina from bauxite. (Machine-translation by Google Translate, not legally binding) |
| DE2063028A1 (en) * | 1970-12-22 | 1972-06-29 | Gebrüder Giulini GmbH, 6700 Ludwigshafen | Process for the production of bricks from red mud |
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