CN111318156A - Co-treatment method and device for red mud dealkalization and flue gas desulfurization - Google Patents
Co-treatment method and device for red mud dealkalization and flue gas desulfurization Download PDFInfo
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Abstract
The invention relates to the field of environmental protection, in particular to a method and a device for jointly treating red mud dealkalization and flue gas desulfurization. The co-treatment method for red mud dealkalization and flue gas desulfurization comprises the following steps: mixing red mud with water, and grinding to obtain red mud slurry; fully contacting the red mud slurry with the flue gas to be treated, and performing desulfurization treatment; and carrying out oxidation treatment on the red mud slurry subjected to desulfurization treatment. The device comprises a desulfurizing tower, a slurry pool and an oxidizing device. The method takes the waste red mud as a desulfurizer, utilizes the high-alkalinity red mud to carry out flue gas desulfurization, obviously improves the desulfurization effect, achieves the effect of dealkalizing the red mud, reduces the pollution of the red mud to the environment, reduces the cost of flue gas desulfurization, realizes the reutilization of the waste red mud, and provides guarantee for the resource utilization of the red mud. The device has the advantages of simple structure, easy amplification, low cost, easy assembly and maintenance and capability of engineering application.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to a method and a device for jointly treating red mud dealkalization and flue gas desulfurization.
Background
In the fields of chemical industry, metallurgy and the like, flue gas generated by some equipment contains a large amount of sulfur dioxide and other acidic gases, such as boiler coal-fired flue gas, can not be directly discharged into the atmosphere, and the flue gas needs to be desulfurized by a flue gas desulfurization device.
At present, limestone wet desulphurization is widely adopted. However, the byproduct gypsum generated by the method is difficult to obtain and utilize, the economic benefit is not obvious, and secondary pollution is easy to cause and the like.
Meanwhile, China is the largest producer of alumina in the world and accounts for 50.2% of the total production energy of the world. According to the difference of ore grade, production method and technical level, most production plants produce 1-2 tons of red mud when producing 1 ton of alumina, and the latest statistical data at the end of 2017 shows that the accumulated stock of red mud in China is about 5 hundred million tons, and the comprehensive utilization rate of red mud is only 4%. The comprehensive utilization rate of the red mud is far lower than the target of 20 percent of the comprehensive utilization rate of the red mud proposed by the Ministry of industry and communications and the Ministry of science and technology in 2010. With the expansion of the aluminum industry and the reduction of the grade of aluminum ore, the yield of red mud will increase year by year.
Red mud is stockpiled, so that a large amount of land resources are occupied, environmental influence and potential safety hazard are easily caused, and the stockpiling cost of 20-40 yuan/ton is generated; in addition, the environmental protection tax Law of the people's republic of China is implemented from 1 month and 1 day of 2018, smelting slag (including red mud) is collected with the tax amount of 25 yuan per ton, and the enterprise pressure is further increased, so that the harmless and recycling treatment technology of the red mud is one of the key technologies for the development of the alumina industry.
The applicant hopes to combine red mud treatment and flue gas desulfurization, and provides a method which can realize dealkalization treatment of red mud and can complete flue gas desulfurization.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a device for the co-treatment of red mud dealkalization and flue gas desulfurization, which effectively utilize red mud to complete flue gas desulfurization, have good desulfurization effect and reduce the pollution of the red mud to the environment.
The invention provides a co-processing method for red mud dealkalization and flue gas desulfurization, which comprises the following steps:
(A) mixing red mud with water, and grinding to obtain red mud slurry;
(B) fully contacting the red mud slurry with the flue gas to be treated, and performing desulfurization treatment;
(C) and carrying out oxidation treatment on the slurry subjected to desulfurization treatment.
Preferably, the method further comprises the following steps: monitoring the gas composition and temperature of the flue gas to be treated and the flue gas subjected to desulfurization treatment, and adjusting the liquid-gas ratio of the red mud slurry to the flue gas to be treated.
Preferably, the step (a) is specifically:
mixing the red mud and water according to a mass ratio of 1: 1-1: 5, grinding, and adding water to obtain red mud slurry.
Preferably, in the step (a), the solid content of the red mud slurry is 0.8-7%.
Preferably, in the step (B), the red mud slurry is mixed withThe liquid-gas ratio of the flue gas to be treated is 5-10L/m3。
Preferably, in the step (B), the concentration of sulfur dioxide in the flue gas to be treated is 700-4000 mg/L.
Preferably, the step (B) is specifically:
and spraying the red mud slurry from top to bottom, fully contacting with the flue gas to be treated from bottom to top, and performing desulfurization treatment.
Preferably, in the step (C), the oxidation method specifically comprises:
introducing oxygen into the slurry after the desulfurization reaction, wherein the introduced molar weight of the oxygen and SO in the flue gas2The molar weight ratio of (a) to (b) is 1:2 to 1:1.
Preferably, in the step (C), the slurry after the desulfurization reaction is subjected to oxidation treatment, and the slurry after the oxidation treatment is repeatedly used in the step (B).
The invention also provides a co-processing device for red mud dealkalization and flue gas desulfurization, which comprises:
the desulfurization tower is provided with a flue gas inlet, a flue gas outlet, a spraying layer, a slurry outlet and a demister;
the slurry tank is provided with a desulfurized slurry inlet, a feed inlet, a stirrer and a slurry discharge port;
the slurry outlet of the desulfurizing tower is connected with the desulfurized slurry inlet of the slurry pool; and
and the oxidation device is connected with the slurry tank.
Compared with the prior art, the co-processing method for dealkalizing the red mud and desulfurizing the flue gas comprises the following steps:
(A) mixing red mud with water, and grinding to obtain red mud slurry;
(B) fully contacting the red mud slurry with the flue gas to be treated, and performing desulfurization treatment;
(C) and carrying out oxidation treatment on the red mud slurry subjected to desulfurization treatment.
The method takes the waste red mud as a desulfurizer, and utilizes the high-alkalinity red mud to desulfurize the flue gas, thereby obviously improving the desulfurization effect, achieving the effect of dealkalizing the red mud and reducing the pollution of the red mud to the environment. Meanwhile, the red mud is used for replacing limestone to carry out flue gas desulfurization, so that the cost of flue gas desulfurization is greatly reduced, the reutilization of the waste red mud is realized, and the guarantee is provided for the resource utilization of the red mud. In addition, the device has the advantages of simple structure, easy amplification, low cost, easy assembly and maintenance and capability of engineering application.
Drawings
FIG. 1 is a schematic structural diagram of a co-processing apparatus for dealkalizing red mud and desulfurizing flue gas according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a co-processing device for dealkalizing red mud and desulfurizing flue gas according to another embodiment of the present invention;
FIG. 3 is a bar graph showing the correlation between red mud slurries of different solids content and flue gas desulfurization rates in the examples of the present invention;
FIG. 4 is a graph showing the desulfurization effect of red mud and limestone with the same initial solid content in example 12 and comparative example 1 of the present invention;
FIG. 5 is a graph showing the desulfurization effect of red mud and limestone under the same pH condition in example 13 and comparative example 2 of the present invention;
illustration of the drawings:
1 is the desulfurizing tower, 2 is the flue gas entry, 3 is desulfurizing tower thick liquid export, 4 is the exhanst gas outlet, 5 is for spraying the layer, 6 is the thick liquid pond, 7 is desulfurization back thick liquid entry, 8 is row thick liquid mouth, 9 is the feed inlet, 10 is the agitator, 11 is oxidation unit, 12 is the defroster, 13 is the circulating pump, 14 is the governing valve, 15 is the flowmeter, 16 is flue gas analysis device.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention in conjunction with the following examples, but it will be understood that the description is intended to illustrate the features and advantages of the invention further, and not to limit the invention.
The embodiment of the invention discloses a co-processing method for red mud dealkalization and flue gas desulfurization, which comprises the following steps:
(A) mixing red mud with water, and grinding to obtain red mud slurry;
(B) fully contacting the red mud slurry with the flue gas to be treated, and performing desulfurization treatment;
(C) and carrying out oxidation treatment on the red mud slurry subjected to desulfurization treatment.
The red mud related by the invention is industrial solid waste generated in the alumina industry, has high alkalinity characteristic and contains a large amount of Na2O、CaO、Fe2O3And Al2O3。
According to the invention, the co-treatment method of red mud dealkalization and flue gas desulfurization is specifically described as follows:
(A) the red mud is mixed with water and ground to obtain red mud slurry.
In this step, the red mud is ball milled with water into a slurry to react, producing sodium hydroxide and calcium hydroxide. The reaction formula can be described as:
red mud + H2O→NaOH+Ca(OH)2
Preferably, the step (a) is specifically:
mixing the red mud and water according to the mass ratio of 1: 1-1: 1.5, grinding, and adding water to obtain the red mud slurry.
The time for the grinding treatment is preferably 2 to 10 hours, and more preferably 2.1 to 3 hours.
After the grinding treatment, the particle size is preferably 250-350 meshes, and more preferably 300-320 meshes.
The solid content of the red mud slurry is preferably 0.8-7%, and more preferably 4-6%.
In order to ensure the stability of the equipment, the pH value of the red mud slurry is preferably 6.0-7.2.
(B) And fully contacting the red mud slurry with the flue gas to be treated, and performing desulfurization treatment.
During the desulfurization treatment, the following reactions occur:
NaOH+SO2→Na2SO3+H2O
Ca(OH)2+SO2→CaSO3+H2O
preferably, the steps are specifically: and spraying the red mud slurry from top to bottom, fully contacting with the flue gas to be treated from bottom to top, and performing desulfurization treatment.
The liquid-gas ratio of the red mud slurry to the flue gas to be treated is preferably 5-10L/m3。
The concentration of sulfur dioxide in the flue gas to be treated is preferably 700-4000 mg/L, and more preferably less than 3000 mg/L. (C) And carrying out oxidation treatment on the slurry subjected to desulfurization treatment.
Through the desulfurization treatment in the step (B), the treated flue gas carries liquid droplets of the slurry, and in order to avoid secondary pollution caused by the liquid droplets, the liquid droplets contained in the flue gas after the desulfurization treatment are preferably removed.
More preferably, the liquid drops contained in the flue gas after desulfurization treatment are removed by a demisting device.
The flue gas after removing the liquid drops can reach the standard of direct discharge.
When the slurry is subjected to oxidation treatment, the following reactions occur:
Na2SO3+O2→Na2SO4
CaSO3+O2→CaSO4
preferably, the oxidation method specifically comprises:
introducing oxygen into the red mud slurry after the desulfurization reaction, wherein the introduced molar weight of the oxygen and SO in the flue gas2The molar weight ratio of (a) to (b) is preferably 1:2 to 1:1.
And (4) oxidizing to further convert sulfite in the desulfurized slurry into stable sulfate.
If the oxidation treatment is incomplete, preferably, the slurry after the oxidation treatment is repeatedly used in step (B). And then continuously contacting with the flue gas to be treated to perform desulfurization treatment. Realizing the recycling of the slurry.
The slurry after the oxidation treatment is dehydrated to complete dealkalization, and the dealkalization can be performed according to common solid waste, or the dealkalization can be further utilized to prepare detection materials and the like.
The co-processing method of the present invention preferably further comprises: monitoring the gas composition and temperature of the flue gas to be treated and the flue gas subjected to desulfurization treatment, and adjusting the liquid-gas ratio of the red mud slurry to the flue gas to be treated. If the difference between the concentration of the sulfur dioxide in the flue gas after desulfurization and the concentration of the sulfur dioxide in the flue gas to be treated is small, the desulfurization rate is poor, and the liquid-gas ratio needs to be increased.
The embodiment of the invention also discloses a co-processing device for red mud dealkalization and flue gas desulfurization, which specifically refers to fig. 1 and comprises the following components:
the device comprises a desulfurizing tower 1, wherein the desulfurizing tower is provided with a flue gas inlet 2, a flue gas outlet 4, a spraying layer 5 and a desulfurizing tower slurry outlet 3;
the slurry tank 6 is provided with a desulfurized slurry inlet 7, a feed inlet 9, a stirrer 10 and a slurry discharge port 8;
the slurry outlet 3 of the desulfurization tower is connected with the desulfurized slurry inlet 7 of the slurry pool; and
and the oxidation device 11 is connected with the slurry pond.
The device of the invention is used in cooperation with the red mud dealkalization and flue gas desulfurization co-treatment method in the technical scheme.
According to the invention, the desulfurization tower is the main component for the desulfurization of flue gases.
The spraying layer is used for inputting red mud slurry into the separation tower. In order to make the red mud slurry fully contact with the flue gas to be treated, preferably, the desulfurization tower can be provided with a plurality of spraying layers, and the spraying layers are arranged in a gradient manner from high to low, and the height of the spraying layers is higher than that of the flue gas inlet. Preferably, the spraying layer is sprayed by using a nozzle.
In order to make the treated flue gas reach the direct emission standard, a demister is preferably arranged at the top of the desulfurization tower.
In order to monitor the gas composition in the flue gas to be treated and the flue gas after desulfurization treatment, it is preferable that an analyzing device is provided at each of the flue gas inlet and the flue gas outlet.
According to the invention, the slurry pond is used for temporary storage and circulation of red mud slurry. The slurry after desulfurization treatment can be recycled to the slurry pool for continuous use or directly discharged.
Preferably, the slurry tank is connected with the slurry inlet of the desulfurization tower through a circulating pump. A flowmeter and an adjusting valve can be arranged between the circulating pump and the spraying layer and used for monitoring and adjusting the introduction amount of the slurry.
The oxidation device is connected with the slurry tank.
The structure of the optimized device is shown in detail in fig. 2.
In order to further understand the present invention, the method and apparatus for co-processing red mud dealkalization and flue gas desulfurization provided by the present invention are described in detail below with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
(A) Adding red mud into a ball mill, adding water in an amount of 1: 1-1: 1.5, grinding for 2-3 h, adding the ground red mud into a slurry pool with the particle size of below 300 meshes, adding a certain amount of water, keeping the solid content of the red mud slurry at 5% and the pH at about 11, introducing flue gas SO2The initial concentration is 1500mg/L, the smoke flow is controlled at 2300m3H, keeping the liquid-gas ratio at 5.3L/m3，
(B) And spraying the red mud slurry from top to bottom, fully contacting with the flue gas to be treated from bottom to top, and performing desulfurization treatment.
(C) And (4) the desulfurized flue gas is discharged after separating liquid drops carried by the gas through a demister. And the red mud slurry after desulfurization treatment flows to the bottom of the desulfurization tower again and flows back to a slurry pool for recycling. Blowing air by an oxidation fan, introducing the molar weight of oxygen and SO in the flue gas2The molar ratio of (1: 2), the oxygen component further oxidizes the sulfite in the desulfurized slurry to convert the sulfite into stable sulfate. And discharging the desulfurized slurry for dehydration to obtain the dealkalized red mud.
Through the on-line monitoring and recording of the concentration of the sulfur dioxide in the desulfurization tail gas, the concentration of the sulfur dioxide in the absorbed flue gas is 200mg/L, and the removal rate of the sulfur dioxide is calculated to be 86.7 percent.
The dealkalized red mud reaches the level of direct treatment.
Example 2
(A) Adding red mud into a ball mill, adding water in an amount of 1: 1-1: 1.5, grinding for 2-3 h, adding the ground red mud into a slurry pool with the particle size of below 300 meshes, adding a certain amount of water, keeping the solid content of the red mud slurry at 5% and the pH at about 11, introducing flue gas SO2The initial concentration is 1500mg/L, the smoke flow is controlled at 2300m3H, keeping the liquid-gas ratio at 7L/m3。
(B) And spraying the red mud slurry from top to bottom, fully contacting with the flue gas to be treated from bottom to top, and performing desulfurization treatment.
(C) And (4) the desulfurized flue gas is discharged after separating liquid drops carried by the gas through a demister. And the red mud slurry after desulfurization treatment flows to the bottom of the desulfurization tower again and flows back to a slurry pool for recycling. Blowing air by an oxidation fan, introducing the molar weight of oxygen and SO in the flue gas2The molar ratio of (1: 2), the oxygen component further oxidizes the sulfite in the desulfurized slurry to convert the sulfite into stable sulfate. And discharging the desulfurized slurry for dehydration to obtain the dealkalized red mud.
Through the on-line monitoring and recording of the concentration of sulfur dioxide in the desulfurization tail gas, the concentration of the sulfur dioxide in the absorbed flue gas is 150mg/L, and the removal rate of the sulfur dioxide is calculated to be 90.0 percent.
The dealkalized red mud reaches the level of direct treatment.
Example 3
(A) Adding red mud into a ball mill, adding water in an amount of 1: 1-1: 1.5, grinding for 2-3 h, adding the ground red mud into a slurry pool with the particle size of below 300 meshes, adding a certain amount of water, keeping the solid content of the red mud slurry at 5% and the pH at about 11, introducing flue gas SO2The initial concentration is 1500mg/L, the smoke flow is controlled at 2300m3H, the liquid-gas ratio is kept at 9L/m3，
(B) And spraying the red mud slurry from top to bottom, fully contacting with the flue gas to be treated from bottom to top, and performing desulfurization treatment.
(C) And (4) the desulfurized flue gas is discharged after separating liquid drops carried by the gas through a demister. And the red mud slurry after desulfurization treatment flows to the bottom of the desulfurization tower again and flows back to a slurry pool for recycling. Blowing air by an oxidation fan, introducing the molar weight of oxygen and SO in the flue gas2The molar ratio of (1: 2), the oxygen component further oxidizes the sulfite in the desulfurized slurry to convert the sulfite into stable sulfate. And discharging the desulfurized slurry for dehydration to obtain the dealkalized red mud.
Through the on-line monitoring and recording of the concentration of the sulfur dioxide in the desulfurization tail gas, the concentration of the sulfur dioxide in the absorbed flue gas is 100mg/L, and the removal rate of the sulfur dioxide is calculated to be 93.3 percent.
The dealkalized red mud reaches the level of direct treatment.
Example 4
(A) Adding red mud into a ball mill, adding water in an amount of 1: 1-1: 1.5, grinding for 2-3 h, adding the ground red mud into a slurry pool with the particle size of below 300 meshes, adding a certain amount of water, keeping the solid content of the red mud slurry at 5% and the pH at about 11, introducing flue gas SO2The initial concentration is 1500mg/L, the smoke flow is controlled at 2300m3H, keeping the liquid-gas ratio at 10L/m3。
(B) And spraying the red mud slurry from top to bottom, fully contacting with the flue gas to be treated from bottom to top, and performing desulfurization treatment.
(C) And (4) the desulfurized flue gas is discharged after separating liquid drops carried by the gas through a demister. And the red mud slurry after desulfurization treatment flows to the bottom of the desulfurization tower again and flows back to a slurry pool for recycling. Blowing air by an oxidation fan, introducing the molar weight of oxygen and SO in the flue gas2The molar ratio of (1: 2), the oxygen component further oxidizes the sulfite in the desulfurized slurry to convert the sulfite into stable sulfate. And discharging the desulfurized slurry for dehydration to obtain the dealkalized red mud.
Through the on-line monitoring and recording of the concentration of the sulfur dioxide in the desulfurization tail gas, the concentration of the sulfur dioxide in the absorbed flue gas is 70mg/L, and the removal rate of the sulfur dioxide is calculated to be 95.3 percent.
The dealkalized red mud reaches the level of direct treatment.
Examples 5 to 11
(A) Adding red mud into a ball mill, adding water according to the amount of 1: 1-1: 1.5, grinding for 2-3 h, adding the ground red mud into a slurry pool with the particle size below 300 meshes, adding a certain amount of water, keeping the solid content of the red mud slurry to be 0.8%, 1.6%, 2.5%, 3.3%, 4.2% and 5.3% respectively, keeping the pH to be about 11, introducing flue gas SO2The initial concentration is 1400mg/L, the smoke flow is controlled at 2300m3H, keeping the liquid-gas ratio at 5.3L/m3，
(B) And spraying the red mud slurry from top to bottom, fully contacting with the flue gas to be treated from bottom to top, and performing desulfurization treatment.
(C) And (4) the desulfurized flue gas is discharged after separating liquid drops carried by the gas through a demister. And the red mud slurry after desulfurization treatment flows to the bottom of the desulfurization tower again and flows back to a slurry pool for recycling. Air is blown in by the oxidation fan, and the oxygen component further oxidizes the sulfite in the desulfurized slurry and converts the sulfite into stable sulfate. And discharging the desulfurized slurry for dehydration to obtain the dealkalized red mud.
Through the on-line monitoring and recording of the concentration of sulfur dioxide in the desulfurization tail gas, the removal rates of the sulfur dioxide are respectively 80.9%, 83.7%, 85.9%, 88.1%, 92.4% and 92.2%.
A bar graph of specific desulfurization rates versus red mud solids content is shown in FIG. 3.
Example 12
(A) Adding red mud into a ball mill, adding water in an amount of 1: 1-1: 1.5, grinding for 2-3 h, adding the ground red mud into a slurry pool with the particle size of below 300 meshes, adding a certain amount of water, keeping the solid content of the red mud slurry at 4.5% and the pH at about 11, introducing flue gas SO2The initial concentration is 1000mg/L, the smoke flow is controlled at 2300m3H, keeping the liquid-gas ratio at 5.1L/m3。
(B) Fully contacting the red mud slurry with the flue gas to be treated, and performing desulfurization treatment; the sulfur dioxide concentration in the flue gas at 10 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, 60 minutes, 70 minutes, and 80 minutes of the desulfurization treatment was recorded, respectively.
(C) And (4) the desulfurized flue gas is discharged after separating liquid drops carried by the gas through a demister. And the red mud slurry after desulfurization treatment flows to the bottom of the desulfurization tower again and flows back to a slurry pool for recycling. Air is blown in by the oxidation fan, and the oxygen component further oxidizes the sulfite in the desulfurized slurry and converts the sulfite into stable sulfate. And discharging the desulfurized slurry for dehydration to obtain the dealkalized red mud.
And calculating the removal rate of the sulfur dioxide by on-line monitoring and recording the concentration of the sulfur dioxide in the desulfurization tail gas.
The dealkalized red mud reaches the level of direct treatment.
Comparative example 1
Introducing flue gas SO2The initial concentration is 1000mg/L, the smoke flow is controlled at 2300m3About/h, and the liquid-gas ratio is kept to be about 5.1L/m3Under the condition, the traditional limestone desulfurization is compared with the red mud desulfurization, and the solid content of limestone slurry is controlled to be 4.5 percent. The sulfur dioxide concentration in the flue gas at 10 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, 60 minutes, 70 minutes, and 80 minutes of the desulfurization treatment was recorded, respectively.
Through comparison between the example 12 and the comparative example 1, the experimental result shows that the desulfurization effect of the red mud slurry is obviously higher than that of the limestone slurry, in the conditions of the embodiment, the highest desulfurization rate of the red mud is 99.6%, while the highest removal rate of the limestone slurry is only 87.1%, and the desulfurization effect of the limestone slurry is reduced faster as the test time is prolonged.
The desulfurization effect of example 12 is compared with that of comparative example 1, and specifically, see FIG. 4.
Example 13
(A) Adding red mud into a ball mill, adding water in an amount of 1: 1-1: 1.5, grinding for 2-3 h, adding the ground red mud into a slurry pool with the particle size below 300 meshes, adding a certain amount of water, keeping the solid content of the red mud slurry at 4.5%, controlling the pH at 7, 6 and 5.3 respectively, introducing flue gas SO2The initial concentration is 1000mg/L, the smoke flow is controlled at 2300m3H, keeping liquid and gasThe ratio is 5.1L/m3，
(B) Fully contacting the red mud slurry with the flue gas to be treated, and performing desulfurization treatment;
(C) removing liquid drops contained in the desulfurized flue gas; and carrying out oxidation treatment on the red mud slurry subjected to desulfurization treatment.
The removal rate of sulfur dioxide is calculated by on-line monitoring and recording the concentration of sulfur dioxide in the desulfurization tail gas, and particularly, see fig. 5.
The treated slurry reaches a level that can be directly treated.
Comparative example 2
Introducing flue gas SO2The initial concentration is 1000mg/L, the smoke flow is controlled at 2300m3About/h, and the liquid-gas ratio is kept to be about 5.1L/m3Under the condition, the traditional limestone desulfurization is compared with the red mud desulfurization, the solid content of limestone slurry is controlled to be 4.5 percent, and the pH is respectively controlled to be 7, 6 and 5.3, so that the flue gas desulfurization is carried out.
The comparison between example 13 and comparative example 2 shows that the desulfurization efficiency of the red mud slurry is better than that of the limestone slurry under the same pH value condition of the slurry. When the pH values of the two slurries are both 7, the desulfurization rate of the red mud slurry is about 86 percent, and the desulfurization rate of the limestone slurry is about 75 percent; when the pH values of the two slurries are 6, the desulfurization rate of the red mud slurry is about 78 percent, and the desulfurization rate of the limestone slurry is about 59 percent; when the pH values of the two slurries are 5.3, the desulfurization rate of the red mud slurry is about 70 percent, and the desulfurization rate of the limestone slurry is about 48 percent.
The experimental effect of desulfurization efficiency in example 13 and comparative example 2 is specifically shown in fig. 5.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A co-processing method for dealkalization of red mud and flue gas desulfurization comprises the following steps:
(A) mixing red mud with water, and grinding to obtain red mud slurry;
(B) fully contacting the red mud slurry with the flue gas to be treated, and performing desulfurization treatment;
(C) and carrying out oxidation treatment on the slurry subjected to desulfurization treatment.
2. The co-processing method of claim 1, further comprising: monitoring the gas composition and temperature of the flue gas to be treated and the flue gas subjected to desulfurization treatment, and adjusting the liquid-gas ratio of the red mud slurry to the flue gas to be treated.
3. The co-processing method according to claim 1 or 2, wherein the step (a) is specifically:
mixing the red mud and water according to the mass ratio of 1: 1-1: 1.5, grinding, and adding water to obtain the red mud slurry.
4. The co-processing method according to claim 3, wherein in the step (A), the solid content of the red mud slurry is 0.8-7%.
5. The co-processing method according to claim 1 or 2, wherein in the step (B), the liquid-gas ratio of the red mud slurry to the flue gas to be processed is 5-10L/m3。
6. The co-processing method according to claim 5, wherein in the step (B), the concentration of sulfur dioxide in the flue gas to be processed is 700-4000 mg/L.
7. The co-processing method according to claim 1 or 2, wherein the step (B) is specifically:
and spraying the red mud slurry from top to bottom, fully contacting with the flue gas to be treated from bottom to top, and performing desulfurization treatment.
8. The co-processing method according to claim 1 or 2, wherein in the step (C), the oxidation method is specifically:
introducing oxygen into the slurry after the desulfurization reaction, wherein the introduced molar weight of the oxygen and SO in the flue gas2The molar weight ratio of (a) to (b) is 1:2 to 1:1.
9. A co-processing method according to claim 1 or 2, wherein in the step (C), the slurry after the desulfurization reaction is subjected to oxidation treatment, and the oxidation-treated slurry is repeatedly used in the step (B).
10. A red mud dealkalization and flue gas desulfurization coprocessing device includes:
the desulfurization tower is provided with a flue gas inlet, a flue gas outlet, a spraying layer and a slurry outlet;
the slurry tank is provided with a desulfurized slurry inlet, a feed inlet, a stirrer and a slurry discharge port;
the slurry outlet of the desulfurizing tower is connected with the desulfurized slurry inlet of the slurry pool; and
and the oxidation device is connected with the slurry tank.
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Application publication date: 20200623 |