CN117185621A - M-type dehydrating agent and preparation method and application thereof - Google Patents
M-type dehydrating agent and preparation method and application thereof Download PDFInfo
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- CN117185621A CN117185621A CN202210609140.3A CN202210609140A CN117185621A CN 117185621 A CN117185621 A CN 117185621A CN 202210609140 A CN202210609140 A CN 202210609140A CN 117185621 A CN117185621 A CN 117185621A
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- 239000012024 dehydrating agents Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title abstract description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 24
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 16
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 16
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 16
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 16
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 16
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 16
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229940047670 sodium acrylate Drugs 0.000 claims abstract description 12
- 239000010802 sludge Substances 0.000 claims description 64
- 230000003750 conditioning effect Effects 0.000 claims description 20
- 239000011259 mixed solution Substances 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 239000003153 chemical reaction reagent Substances 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 208000005156 Dehydration Diseases 0.000 abstract description 8
- 230000018044 dehydration Effects 0.000 abstract description 8
- 238000006297 dehydration reaction Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 abstract description 4
- 230000002209 hydrophobic effect Effects 0.000 description 8
- -1 hydroxide ions Chemical class 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 239000004721 Polyphenylene oxide Substances 0.000 description 5
- 150000001412 amines Chemical class 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 229920000570 polyether Polymers 0.000 description 5
- 238000004132 cross linking Methods 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- 239000008394 flocculating agent Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 4
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 230000001143 conditioned effect Effects 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- LWNKHILEJJTLCI-UHFFFAOYSA-J calcium;magnesium;tetrahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[Mg+2].[Ca+2] LWNKHILEJJTLCI-UHFFFAOYSA-J 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Abstract
The application discloses an M-type dehydrating agent, a preparation method and application thereof, and the M-type dehydrating agent comprises the following components in parts by weight: 15-25 parts of calcium hydroxide, 5-10 parts of magnesium hydroxide, 1-3 parts of sodium acrylate, 3-5 parts of sodium hydroxide, 0.5-1 part of hydrogen peroxide and 60-77 parts of water. The M-type dehydrating agent has the advantages of wide sources of raw materials, low cost, stable performance during use and good dehydrating effect, not only can optimize the pH value of discharged mud and water, but also can effectively promote the deep dehydration of the mud, the water content of mud cakes obtained after dehydration treatment is below 60%, the pH value of the mud cakes is above 5, and the requirements of the current policy are completely met.
Description
Technical Field
The application relates to the technical field of sewage treatment, in particular to an M-type dehydrating agent and a preparation method and application thereof.
Background
In recent years, the increase in the amount of sewage to be treated has led to the generation of a large amount of surplus sludge in the water treatment process, and thus the treatment and recycling of sludge have been attracting attention. The sludge is a product of the sewage treatment process, has very complex composition components, contains a large amount of water, causes the sludge to be quite large in volume, brings great difficulty to subsequent treatment procedures and transportation and greatly increases treatment cost, and therefore, the sludge must be dehydrated to reduce the volume of the sludge.
The sludge is generally difficult to separate solid from liquid by conventional precipitation and simple mechanical dehydration, because the water in the sludge exists in a form of interstitial water and internal bound water or attached water together with the solid except for a small amount of free water. Therefore, before the sludge is subjected to filter pressing treatment, a dehydrating agent is required to be added into the sludge for tempering so as to ensure effective separation of solids and liquid in the subsequent filter pressing treatment.
At present, the commonly used sludge dewatering agent is an inorganic, organic or mixed flocculant thereof. Inorganic flocculating agents such as ferric salt, aluminum salt, calcium ions and the like reduce repulsive potential through electric neutralization and compression of electric double layers, so that repulsive interaction among the particles is reduced, and the purpose of coagulation is achieved; organic flocculating agents such as polyacrylamide are mainly used for gathering particles together through the adsorption and bridging action of high molecular compounds to form larger flocs for sedimentation; the mixed flocculant is that inorganic flocculant and organic flocculant are matched in certain proportion and adding sequence to reach the efficient dewatering treatment effect on sludge.
However, when the existing sludge dewatering agent is used, the dewatering treatment effect is unstable, the water content of the dewatered sludge is still more than 80%, deep dewatering of the sludge cannot be promoted, and the pH value of liquid and solid (mud cake) after filter pressing treatment cannot be adjusted, so that the current policy requirements cannot be met.
Disclosure of Invention
In order to solve the problems in the background technology, the application provides the M-type dehydrating agent which has the advantages of wide raw material sources, low cost, stable performance in use and good dehydrating effect, can optimize the pH values of discharged mud and water, and can effectively promote deep dehydration of the mud. Therefore, the application also provides a preparation method and application of the M-type dehydrating agent.
In order to achieve the above purpose, the present application adopts the following technical scheme:
in a first aspect of the application, there is provided an M-type dehydrating agent comprising the following components in parts by weight:
15-25 parts of calcium hydroxide, 5-10 parts of magnesium hydroxide, 1-3 parts of sodium acrylate, 3-5 parts of sodium hydroxide, 0.5-1 part of hydrogen peroxide and 60-77 parts of water.
In a second aspect of the present application, there is provided a method for preparing the M-type dehydrating agent, comprising the steps of:
s1, sequentially adding calcium hydroxide, magnesium hydroxide and sodium acrylate into a stirrer, adding water into the stirrer, uniformly stirring, and pouring the mixture into a reaction kettle;
s2, heating the mixed solution in the reaction kettle in the step S1 to 60-80 ℃, adding sodium hydroxide and hydrogen peroxide into the mixed solution, uniformly mixing the mixed solution, and reacting under a certain pressure;
and S3, after the mixture in the step S2 is completely reacted, reducing the temperature, discharging, and subpackaging to obtain the M-shaped dehydrating agent.
Specifically, in the step S2, the reaction pressure is 5-7 MPa.
Specifically, in the step S3, the reaction time is 60-80min, and the temperature is reduced to 15-25 ℃ after the reaction is completed.
The technical scheme is adopted:
the applicant of the present application has found through great amount of test research that sodium hydroxide, magnesium hydroxide, calcium hydroxide and sodium acrylate are reacted in certain proportion under specific heating and pressurizing condition to form low molecular weight copolymer. When the sludge water treatment device is used, when the sludge water treatment device is put into sludge, a large amount of polynuclear complex such as calcium hydroxide-magnesium hydroxide can be rapidly hydrolyzed under the cooperation of hydrogen peroxide, a hydrophobic water filtering channel is formed in a bridging and crosslinking mode, a certain degree of pressure can be born, the hydrophobic water filtering channel is utilized to ensure that bound water and free water in the sludge can be rapidly extruded out under a certain pressure, and meanwhile, hydroxide ions in sodium hydroxide, magnesium hydroxide and calcium hydroxide are utilized to neutralize hydrogen ions in the sludge, so that the PH of the sludge is ensured to be close to neutral.
In a third aspect of the present application, there is provided an application of the M-type dehydrating agent, where the M-type dehydrating agent is used in a sludge conditioning process before a filter pressing treatment is performed on sludge, and after the M-type dehydrating agent is added, a pH value of the sludge is controlled to be above 5.
Before filter pressing treatment, the sludge is pumped into a conditioning tank for conditioning treatment through a pipeline, an idle inorganic coagulant dissolution system can be adopted for the M-type dehydrating agent, a reagent is quantitatively and manually added in the dissolution tank on site, after the reagent is fully stirred and dissolved, the reagent is pumped into the conditioning tank through a pipeline dosing pump, the adding amount of the M-type dehydrating agent is based on the pH value of the conditioned sludge, and the pH value of the sludge is controlled to be more than 5.
Specifically, the sludge treating agent and the flocculating agent are matched for use and are added in the sludge conditioning process.
Specifically, the flocculant is polysilicate ferric sulfate and polyether amine.
In the process of conditioning sludge in the conditioning tank, through the cooperation of polysilicate ferric sulfate and polyetheramine in the flocculating agent, the electric neutralization effect and the bridging effect are achieved, and particles in the muddy water are gathered together, so that the particles are coagulated and precipitated; then through the M-shaped dehydrating agent, a hydrophobic drainage channel is formed in the sludge in a bridging and crosslinking mode, and the pressure can bear a certain degree, so that the water content of the sludge after filter pressing treatment can be reduced to below 60% by utilizing the hydrophobic drainage channel and the drainage channel to ensure that the bound water and free water in the sludge can be rapidly extruded out under a certain pressure. Meanwhile, hydroxide ions in sodium hydroxide, magnesium hydroxide and calcium hydroxide are utilized to neutralize hydrogen ions in sludge, so that the pH value of the sludge is ensured to be close to neutrality, and the pH value of a mud cake is controlled to be more than 5, thereby completely meeting the current policy requirements.
Compared with the prior art, the application has the following beneficial effects:
the M-shaped dehydrating agent forms a hydrophobic drainage channel in the sludge in a bridging and crosslinking mode, can bear pressure to a certain extent, ensures that bound water and free water in the sludge can be rapidly extruded out under certain pressure by utilizing the hydrophobic drainage channel, and simultaneously neutralizes hydrogen ions in the sludge by utilizing hydroxide ions in sodium hydroxide, magnesium hydroxide and calcium hydroxide to ensure that the PH of the sludge is close to neutral; the M-type dehydrating agent has the advantages of wide sources of raw materials, low cost, stable performance during use and good dehydrating effect, not only can optimize the pH value of discharged mud and water, but also can effectively promote the deep dehydration of the mud, the water content of mud cakes obtained after dehydration treatment is below 60%, the pH value of the mud cakes is above 5, and the requirements of the current policy are completely met.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Example 1
An M-type dehydrating agent comprises the following components:
21 parts of calcium hydroxide, 8 parts of magnesium hydroxide, 1 part of sodium acrylate, 5 parts of sodium hydroxide, 0.7 part of hydrogen peroxide and 60 parts of water.
The preparation method of the M-type dehydrating agent comprises the following steps:
s1, sequentially adding calcium hydroxide, magnesium hydroxide and sodium acrylate into a stirrer, adding water into the stirrer, uniformly stirring, and pouring the mixture into a reaction kettle;
s2, heating the mixed solution in the reaction kettle in the step S1 to 72 ℃, adding sodium hydroxide and hydrogen peroxide into the mixed solution, uniformly mixing the mixed solution and reacting the mixed solution under the pressure of 6 MPa;
s3, after the mixture in the step S2 reacts for 60min, the temperature is reduced to 20 ℃, discharging is carried out, and the M-shaped dehydrating agent is obtained after subpackaging.
Example 2
An M-type dehydrating agent comprises the following components:
15 parts of calcium hydroxide, 10 parts of magnesium hydroxide, 2 parts of sodium acrylate, 4 parts of sodium hydroxide, 1 part of hydrogen peroxide and 77 parts of water.
The preparation method of the M-type dehydrating agent comprises the following steps:
s1, sequentially adding calcium hydroxide, magnesium hydroxide and sodium acrylate into a stirrer, adding water into the stirrer, uniformly stirring, and pouring the mixture into a reaction kettle;
s2, heating the mixed solution in the reaction kettle in the step S1 to 80 ℃, adding sodium hydroxide and hydrogen peroxide into the mixed solution, uniformly mixing the mixed solution and reacting the mixed solution under the pressure of 7 MPa;
s3, after the mixture in the step S2 reacts for 60min, the temperature is reduced to 25 ℃, discharging is carried out, and the M-shaped dehydrating agent is obtained after subpackaging.
Example 3
An M-type dehydrating agent comprises the following components:
25 parts of calcium hydroxide, 5 parts of magnesium hydroxide, 3 parts of sodium acrylate, 3 parts of sodium hydroxide, 0.5 part of hydrogen peroxide and 70 parts of water.
The preparation method of the M-type dehydrating agent comprises the following steps:
s1, sequentially adding calcium hydroxide, magnesium hydroxide and sodium acrylate into a stirrer, adding water into the stirrer, uniformly stirring, and pouring the mixture into a reaction kettle;
s2, heating the mixed solution in the reaction kettle in the step S1 to 60 ℃, adding sodium hydroxide and hydrogen peroxide into the mixed solution, uniformly mixing the mixed solution and reacting the mixed solution under the pressure of 5 MPa;
s3, after the mixture in the step S2 reacts for 80min, the temperature is reduced to 15 ℃, discharging is carried out, and the M-shaped dehydrating agent is obtained after subpackaging.
Example 4
The sludge was dehydrated using the M-type dehydrating agent prepared in example 1:
preparation and addition of M-type dehydrating agent:
the polysilicate ferric sulfate can be added in a common adding mode and a common adding amount in the prior art, namely, the polysilicate ferric sulfate is added and dissolved by adopting a corresponding tank body, and then is pumped into a tempering tank by using a pipeline dosing pump.
The M-type dehydrating agent is prepared by utilizing an idle inorganic coagulant dissolution system, carrying out on-site quantitative manual dosing of the agent in a dissolution tank, fully stirring and dissolving, and then pumping the agent into a conditioning tank by using a pipeline dosing pump.
The polyether amine can be added in a common adding mode and a common adding amount in the prior art, namely, the polyether amine is added and dissolved by adopting a corresponding tank body, and is pumped into a tempering tank by using a pipeline dosing pump.
2. The operation mode is as follows:
2.1 sludge conditioning:
stirring frequency is kept at 15HZ, mud is firstly added during sludge conditioning, meanwhile, adding ferric polysilicate sulfate and ferric polysilicate sulfate, stirring and reacting for 10min after the adding is finished, then pumping the dissolved M-shaped dehydrating agent into a conditioning tank through a pipeline, stirring for 10min after the adding of the dehydrating agent is finished, testing pH, keeping the pH above 5, adding polyether amine, stirring for 5min after the adding of polyether amine is finished, and starting plate frame mud feeding at any time.
2.2 plate and frame mode of operation:
(1) the low-pressure pump is fed at constant frequency, the constant frequency is 85%, and the pressure inside the plate frame is gradually increased from 0bar to 6.5bar.
(2) The low-pressure pump is fed at constant pressure and variable frequency, the constant pressure is 6.5bar, the low-pressure pump frequency is gradually attenuated from 85% to the set lowest frequency, such as 25%, the low-pressure pump is automatically stopped, and the high-pressure pump is automatically started to operate.
(3) The high-pressure pump is fed at constant frequency, the constant frequency is 90%, and the pressure inside the plate frame is gradually increased from 6.5bar to 9bar.
(4) The high-pressure pump is fed at constant pressure and variable frequency, the constant pressure is 9bar, the frequency of the high-pressure pump is gradually reduced from 90% to the set lowest frequency, such as 30%, the high-pressure pump is automatically stopped, and the pressing pump is automatically started to operate.
(5) The high-pressure squeezing pump is used for constant-frequency squeezing, the constant frequency is 80%, and the internal pressure of the plate frame is gradually increased from 0bar to 12bar.
(6) The high-pressure squeezing pump is used for squeezing at constant pressure, the constant pressure is 12bar, the high-pressure squeezing pump automatically stops running until the set squeezing time (3600 s or 4200 s) is finished, and the squeezing water flows back to the squeezing water tank.
(7) And (5) plate frame pulling, plate opening and discharging.
3. And (3) test sampling:
feeding mud from a mud conditioning tank;
the dewatered sludge is taken from a sludge cake after a plate frame filter press is opened.
4. Water content, pH value measurement:
and (3) adopting an imported MF50 automatic moisture tester to carry out on-site measurement on the mud inlet moisture content of the mud and the moisture content of the dehydrated mud cake.
And adopting a Lei Ci PH tester to carry out field measurement on the PH of the sludge in the sludge and the PH of the dehydrated sludge cake.
The mud cake PH test method comprises the following steps: 2g of mud cake and 50ml of water are stirred uniformly.
5. The test process comprises the following steps:
5.1 M type dehydrating agent addition amount:
and controlling the PH of the sludge to be above 5 based on the PH of the conditioned sludge.
5.2 adjusting the running interval of the plate frames:
the machine No. 3, the machine No. 4 and the machine frame 2 run simultaneously.
6. Test data, see tables 1 and 2:
TABLE 1 sludge conditioning tank parameters
Table 2 parameters related to mud cake
As can be seen from the related parameters of the sludge conditioning tank in the table 1 and the related parameters of the mud cake obtained after the sludge is subjected to the filter pressing treatment in the table 2, the M-shaped dehydrating agent prepared in the application is matched with the polysilicongate and the polyetheramine for use, so that the water content of the sludge after the filter pressing treatment can be reduced to below 60%, the pH value of the mud cake is controlled to be above 5, and the current policy requirements can be completely met.
Comparative example 1
Comparative example 1 is a comparative test example of example 4, in which the M-type dehydrating solvent prepared in example 1 was not added to a conditioning tank thereof during the sludge dewatering treatment. The remaining processing steps and processing parameters were the same as in example 4. Test data, see tables 3 and 4:
TABLE 3 sludge conditioning tank parameters
TABLE 4 mud cake related parameters
As can be seen from comparison of the test data in example 4 and comparative example 1, in comparative example 1, the M-type dehydrating agent prepared in the present application was not added into the conditioning tank, in example 4, the M-type dehydrating agent prepared in the present application was additionally added into the conditioning tank while maintaining the original amounts and orders of addition of the polysiliconesulfate and polyetheramine, the water content of the mud cake obtained after the press filtration treatment in example 4 was 2 to 3 percentage points lower than that of the mud cake obtained after the press filtration treatment in comparative example 1, the water content of the mud cake obtained after the press filtration treatment in example 4 was controlled to be 60% or less, and the pH of the mud cake obtained in example 4 was 5 or more, thereby completely satisfying the current policy requirements.
In summary, the M-shaped dehydrating agent forms a hydrophobic drainage channel in the sludge in a bridging and crosslinking mode, can bear a certain degree of pressure, ensures that bound water and free water in the sludge can be rapidly extruded out under a certain pressure by utilizing the hydrophobic drainage channel, and simultaneously neutralizes hydrogen ions in the sludge by utilizing hydroxide ions in sodium hydroxide, magnesium hydroxide and calcium hydroxide to ensure that the PH of the sludge is close to neutral; the M-type dehydrating agent has the advantages of wide sources of raw materials, low cost, stable performance during use and good dehydrating effect, not only can optimize the pH value of discharged mud and water, but also can effectively promote the deep dehydration of the mud, the water content of mud cakes obtained after dehydration treatment is below 60%, the pH value of the mud cakes is above 5, and the requirements of the current policy are completely met.
The foregoing description of the application has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the application pertains, based on the idea of the application.
Claims (7)
1. The M-type dehydrating agent is characterized by comprising the following components in parts by weight:
15-25 parts of calcium hydroxide, 5-10 parts of magnesium hydroxide, 1-3 parts of sodium acrylate, 3-5 parts of sodium hydroxide, 0.5-1 part of hydrogen peroxide and 60-77 parts of water.
2. A process for preparing M-type dehydrating agents as claimed in claim 1, characterized by comprising the steps of:
s1, sequentially adding calcium hydroxide, magnesium hydroxide and sodium acrylate into a stirrer, adding water into the stirrer, uniformly stirring, and pouring the mixture into a reaction kettle;
s2, heating the mixed solution in the reaction kettle in the step S1 to 60-80 ℃, adding sodium hydroxide and hydrogen peroxide into the mixed solution, uniformly mixing the mixed solution, and reacting under a certain pressure;
and S3, after the mixture in the step S2 is completely reacted, reducing the temperature, discharging, and subpackaging to obtain the M-shaped dehydrating agent.
3. The method for preparing M-type dehydrating agents according to claim 2, wherein the reaction pressure in the step S2 is 5 to 7MPa.
4. The method for preparing M-type dehydrating reagent according to claim 2, wherein in the step S3, the reaction time is 60-80min, and the temperature is reduced to 15-25 ℃ after the reaction is completed.
5. The use of the M-type dehydrating agent according to claim 1, wherein the M-type dehydrating agent is used in a sludge conditioning process before the filter pressing treatment of the sludge, and the pH value of the sludge is controlled to be 5 or more after the M-type dehydrating agent is added.
6. The use of an M-type dewatering agent according to claim 5, wherein the sludge treatment agent is added in combination with a flocculant during sludge conditioning.
7. Use of an M-type dewatering agent according to claim 6, characterized in that the flocculant is polysilicongate and polyetheramine.
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