CN107892735A - A kind of Compositional type coal water slurry dispersing agent and preparation method thereof - Google Patents
A kind of Compositional type coal water slurry dispersing agent and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of Compositional type coal water slurry dispersing agent, the Compositional type coal water slurry dispersing agent is made up of lignin type coal water slurry dispersing agent and polyocarboxy acid type coal water slurry dispersing agent, wherein, according to mass fraction, number shared by lignin type coal water slurry dispersing agent is 60 90 parts, and number shared by polyocarboxy acid type coal water slurry dispersing agent is 10 40 parts.The present invention also provides a kind of preparation method of Compositional type coal water slurry dispersing agent.The Compositional type coal water slurry dispersing agent has good slurry performance for being not easy into the lignite of slurry, slurry is had good stability and relatively low viscosity.
Description
Technical field
The present invention relates to a kind of Compositional type coal water slurry dispersing agent and preparation method thereof, belongs to coal water slurry dispersing agent technology neck
Domain.
Background technology
At present, China is the country of one " rich in coal and poor in oil ", and coal resources are in China's production of energy and consumption structure
Ratio is held at more than 70%, and China possesses that coal class is also more complete, from lignite, lower-grade metamorphic bituminous rotten to height
Bituminous coal, anthracite have, and particularly lignite resource enriches, and account for the 40% of coal resources in China reserves.Into after 21 century, China
Steam coal structure will be based on lignite and not viscous, long bituminous coal.Therefore, effective utilize of lignite is increasingly taken seriously.
Lignite is the minimum coal of degree of coalification, volatile, has an abundant microcellular structure, easy-weathering fragmentation, it is oxidizable from
Combustion, is not easy chemical process, and caloric value is relatively low when having the higher water content directly to burn, and the direct burning of coal can be to environment
Very big pollution is caused, the oxygen content of lignite is higher in addition, there is the oxygen-containing functional groups such as substantial amounts of phenolic hydroxyl group, carboxyl, carbonyl, therefore,
Lignite is unsuitable for storing for a long time, is unsuitable for transporting for long-distance, and is also unsuitable for directly utilizing.At present, for the effective work utilized of lignite
Skill power consumption is larger, so in order to improve effective utilization of lignite, reduces the pollution for directly using coal, novel cleaning clean coal technology turns into brown
The developing direction of coal application.Water-coal-slurry receives much concern as a kind of new, efficient, cleaning coal derived fuel, still, due to lignite
Design feature make its paste-forming properties poor, be not easy into slurry, the slurry concentration made is relatively low, and slurry stability is bad.For this
Defect, use raw coal size grading at present, select suitable dispersant, or using be incorporated it is a certain proportion of easily into slurry coal come
Improve the slurry performance of lignite.
It is therefore desirable to design a kind of Compositional type coal water slurry dispersing agent and preparation method thereof, to overcome above mentioned problem.
The content of the invention
It is an object of the invention to overcome the defect of prior art, there is provided a kind of Compositional type coal water slurry dispersing agent and its system
Preparation Method, the Compositional type coal water slurry dispersing agent have good slurry performance for being not easy into the lignite of slurry, have slurry good
Good stability and relatively low viscosity.
What the present invention was realized in：
The present invention provides a kind of Compositional type coal water slurry dispersing agent, and the Compositional type coal water slurry dispersing agent is by lignin type water coal
Dispersant and polyocarboxy acid type coal water slurry dispersing agent composition are starched, wherein, according to mass fraction, shared by lignin type coal water slurry dispersing agent
Number is 60-90 parts, and number shared by polyocarboxy acid type coal water slurry dispersing agent is 10-40 parts.
The present invention also provides a kind of preparation method of Compositional type coal water slurry dispersing agent, by lignin type coal water slurry dispersing agent and
Polyocarboxy acid type coal water slurry dispersing agent is prepared respectively, is proportionally stirred, you can obtains Compositional type coal water slurry dispersing agent；
Wherein, the preparation process of the lignin type coal water slurry dispersing agent is：
A1：Sulfonating agent is dissolved in water, adjusts PH=10-12, the stirring of acetone catalyst is added at 45 DEG C -50 DEG C；
A2：When temperature is 50 DEG C, starts that the formalin that mass fraction is 37% is added dropwise, 0.5-0.6 hours are added dropwise；
A3：Alkali lignin is added, is warming up to 90-95 DEG C, reacts 3-3.5 hours, you can obtains lignin type water-coal-slurry point
Powder；
The preparation process of the polyocarboxy acid type coal water slurry dispersing agent is：
B1：Polyethenoxy ether class polymeric monomer is placed in four-hole boiling flask, is stirred at room temperature, is dissolved in water；
B2：Unsaturated carboxylic acid monomer, crylic acid hydroxy ester, reproducibility initiator and chain-transferring agent are dissolved in water, are made into 1#
Material；
B3：Oxidative initiator is added after polyethenoxy ether class polymeric monomer is completely dissolved, stirs 3-5min, at room temperature
Start that 1# material are added dropwise, 1# gobs add 2-5 hours, treat that 1# material are all added dropwise, react 0.5-2 under room temperature (25 DEG C -30 DEG C)
Hour, then moisturizing, it is 5-7 to adjust PH with alkaline conditioner, you can obtains polyocarboxy acid type coal water slurry dispersing agent.
Further, the sulfonating agent is sodium sulfite.
Further, the APEO polymeric monomer is methyl allyl polyoxyethylene ether, isopentene group polyoxyethylene
One or both of ether, 4- hydroxy butyl vinyl ethers.
Further, the molecular weight of the APEO polymeric monomer is 2400, one or both of 3000.
Further, the unsaturated carboxylic acid monomer is one or both of acrylic acid, methacrylic acid, itaconic acid.
Further, the acrylic acid hydroxy alkyl ester is in hydroxy-ethyl acrylate, hydroxypropyl acrylate, hy-droxybutyl
One or two.
Further, the oxidative initiator is hydrogen peroxide, ammonium persulfate, one or both of potassium peroxydisulfate, institute
Reproducibility initiator is stated as one or both of ascorbic acid, sodium hydrogensulfite and ferrous sulfate.
Further, the chain-transferring agent is one or both of mercaptopropionic acid, TGA and mercaptoethanol.
Further, the alkaline conditioner is the sodium hydrate aqueous solution of mass fraction 30%.
The invention has the advantages that：
1st, Compositional type coal water slurry dispersing agent is made up of lignin type coal water slurry dispersing agent and polyocarboxy acid type coal water slurry dispersing agent,
And lignin type dispersant accounts for main component, and raw material is easy to get, and cost is controllable.
2nd, type coal water slurry dispersing agent is synthesized by sulfonation and condensation process；Polyocarboxy acid type coal water slurry dispersing agent is according to free radical
Principle polymerize, and two kinds of coal water slurry dispersing agent synthesis technique is simple, easy to operate.
3rd, the Compositional type coal water slurry dispersing agent is acted synergistically due to two distinct types of dispersant, to being not easy into slurry
Lignite has good paste-forming properties, and slurry has preferably stable and has relatively low viscosity, and volume is few.
Embodiment
The technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described implementation
Example only part of the embodiment of the present invention, rather than whole embodiments.It is common based on the embodiment in the present invention, this area
All other embodiment that technical staff is obtained on the premise of creative work is not made, belong to what the present invention protected
Scope.
The embodiment of the present invention provides a kind of Compositional type coal water slurry dispersing agent, and the Compositional type coal water slurry dispersing agent is by lignin
Type coal water slurry dispersing agent and polyocarboxy acid type coal water slurry dispersing agent composition, wherein, according to mass fraction, lignin type effective dispersant
Number shared by agent is 60-90 parts, and number shared by polyocarboxy acid type coal water slurry dispersing agent is 10-40 parts, and both are at shared number sum
100 parts.I.e. when number shared by lignin type coal water slurry dispersing agent is 60 parts, then part shared by polyocarboxy acid type coal water slurry dispersing agent
Number is 40 parts；When number shared by lignin type coal water slurry dispersing agent is 70 parts, then shared by polyocarboxy acid type coal water slurry dispersing agent
Number is 30 parts；When number shared by lignin type coal water slurry dispersing agent is 80 parts, then polyocarboxy acid type coal water slurry dispersing agent institute
Number is accounted for as 20 parts；When number shared by lignin type coal water slurry dispersing agent is 90 parts, then polyocarboxy acid type coal water slurry dispersing agent
Shared number is 10 parts.
The present invention also provides a kind of preparation method of Compositional type coal water slurry dispersing agent, by lignin type coal water slurry dispersing agent and
Polyocarboxy acid type coal water slurry dispersing agent is prepared respectively, is proportionally stirred, you can obtains Compositional type coal water slurry dispersing agent.
Wherein, the raw material of the lignin type coal water slurry dispersing agent is by sulfonating agent, ketone catalyst, condensing agent and wooden
Element.Sulfonating agent is sodium sulfite, and ketone catalyst is acetone, and condensing agent is the formalin of mass fraction 37%.Sulfonating agent：Third
Ketone：Formaldehyde=2.2:1.9:1 (mol ratio), lignin account for the 15% of gross mass.The system of the lignin type coal water slurry dispersing agent
It is for step：
A1：Sulfonating agent is dissolved in water, adjusts pH value, the stirring of acetone catalyst is added at 45 DEG C -50 DEG C；The sulfonating agent
For sodium sulfite.
A2：When temperature is 50 DEG C, starts that the formalin that mass fraction is 37% is added dropwise, 0.5-0.6 hours are added dropwise；
A3：Alkali lignin is added, is warming up to 90-95 DEG C, reacts 3-3.5 hours, you can obtains lignin type water-coal-slurry point
Powder.
In this preferred embodiment, process conditions selection is：PH value is 12, and the temperature for adding acetone is 47 DEG C, adds alkali
95 DEG C are warming up to after lignin.
The preparation process of the polyocarboxy acid type coal water slurry dispersing agent is：
B1：Polyethenoxy ether class polymeric monomer is placed in four-hole boiling flask, is stirred at room temperature, is dissolved in water；The polyoxy
Vinethene polymeric monomer is one or both of methyl allyl polyoxyethylene ether, isopentene group APEO.Its relative point
Protonatomic mass is 2400 or 3000.
B2：Unsaturated carboxylic acid monomer, crylic acid hydroxy ester, reproducibility initiator and chain-transferring agent are dissolved in water, are made into 1#
Material.Wherein, the unsaturated carboxylic acid monomer is one or both of acrylic acid, methacrylic acid, itaconic acid.The acrylic acid
Hydroxy ester is one or both of hydroxy-ethyl acrylate, hydroxypropyl acrylate, hy-droxybutyl.The reproducibility initiator
For one or both of ascorbic acid, sodium hydrogensulfite and ferrous sulfate.The chain-transferring agent is mercaptopropionic acid, TGA
One or both of with mercaptoethanol.Wherein, unsaturated carboxylic acid monomer concentration is 23.4%-40%, acrylic acid hydroxy alkyl ester
Concentration is 7.5%-57%, and reproducibility initiator concentration is 0.4%-2%, and the concentration of chain-transferring agent is 0.5%-1.4%.
B3：Oxidative initiator is added after polyethenoxy ether class polymeric monomer is completely dissolved, stirs 3-5min, the oxidation
Property initiator be hydrogen peroxide, ammonium persulfate, one or both of potassium peroxydisulfate.Start that 1# material, 1# gobs is added dropwise at room temperature
Add 2-5 hours, treat that 1# material are all added dropwise, 0.5-2 hours are reacted under room temperature (25 DEG C -30 DEG C), then moisturizing, use alkali
Property conditioning agent regulation PH be 5-7, you can obtain polyocarboxy acid type coal water slurry dispersing agent.The alkaline conditioner is that mass fraction is
30% sodium hydrate aqueous solution.
Wherein, the mass fraction proportioning of each raw material of the polyocarboxy acid type coal water slurry dispersing agent is：
In this preferred embodiment, raw material selection is：Isopentene group APEO 35.9%, hydrogen peroxide 0.23%, third
Olefin(e) acid 2.1%, hydroxy-ethyl acrylate 5.1%, deionized water 56.3%, ascorbic acid 0.072%, TGA 0.23%.1#
Gob adds 3 hours.
Illustrated below by way of multiple embodiments：
Embodiment 1：
Lignin type coal water slurry dispersing agent and polyocarboxy acid type coal water slurry dispersing agent are pressed 9:1 uniformly mixing.Lignin type water
Coal-slurry dispersing agent prepares method described above, wherein, PH is adjusted to 11, and the temperature for adding acetone is 40 DEG C, adds lignin
Temperature rises to 90 DEG C afterwards.Preparing for polyocarboxy acid type coal water slurry dispersing agent is as follows, weigh methyl allyl polyoxyethylene ether 310g in
In 1000ml four-hole boiling flasks, 177.6g deionized waters are added.Weigh 30.2g acrylic acid, 7.9g hydroxy-ethyl acrylates, 1.22g mercaptos
Base propionic acid, 0.4g ascorbic acid are dissolved in 129.92g deionized waters and are made into 1# material, standby.Treat isopentene group APEO normal temperature
25 DEG C are completely dissolved, and ammonium persulfate 1.99g is added at 25 DEG C of normal temperature, after stirring 3min-5min, start that 1# is added dropwise, 1# gobs add
2.5 hours, 25 DEG C of normal temperature reacted 1 hour.After moisturizing 205g, both.
Embodiment 2：
Lignin type coal water slurry dispersing agent and polyocarboxy acid type coal water slurry dispersing agent are pressed 8:2 uniformly mixing.Lignin type water
Coal-slurry dispersing agent prepares method described above, wherein, PH is adjusted to 12, and the temperature for adding acetone is 45 DEG C, adds lignin
Temperature rises to 93 DEG C afterwards.Preparing for polyocarboxy acid type coal water slurry dispersing agent is as follows, weigh isopentene group APEO 300g in
In 1000ml four-hole boiling flasks, 182.3g deionized waters are added.Weigh 20.4g methacrylic acids, 44.1g hydroxypropyl acrylates,
1.72g TGAs, 0.64g sodium hydrogensulfites are dissolved in 115.4g deionized waters and are made into 1# material, standby.Treat isopentene group polyoxy second
25 DEG C of alkene ether normal temperature is completely dissolved, and hydrogen peroxide 1.99g is added at 25 DEG C of normal temperature, after stirring 3min-5min, starts that 1#, 1# is added dropwise
Gob adds 2 hours, treats that 2# is dripped, and 25 DEG C of normal temperature reacts 0.5 hour.After moisturizing 190g, produce.
Embodiment 3：
Lignin type coal water slurry dispersing agent and polyocarboxy acid type coal water slurry dispersing agent are pressed 7:3 uniformly mixing.Lignin type water
Coal-slurry dispersing agent prepares method described above, wherein, PH is adjusted to 11, and the temperature for adding acetone is 50 DEG C, adds lignin
Temperature rises to 95 DEG C afterwards.Preparing for polyocarboxy acid type coal water slurry dispersing agent is as follows, weigh isopentene group APEO 300g in
In 1000ml four-hole boiling flasks, 214g deionized waters are added.Weigh 18.2g acrylic acid, 33.4g hydroxy-ethyl acrylates, 1.96g mercaptos
Base ethanol, 0.54g ferrous sulfate are dissolved in 115.4g deionized waters and are made into 1# material, standby.Treat isopentene group APEO normal temperature
25 DEG C are completely dissolved, and hydrogen peroxide 1.74g is added at 25 DEG C of normal temperature, after stirring 3min-5min, start that 1# is added dropwise, 1# gobs add 3 small
When, 25 DEG C of normal temperature reacts 1 hour.After moisturizing 192.85g, produce.
Embodiment 4：
Lignin type coal water slurry dispersing agent and polyocarboxy acid type coal water slurry dispersing agent are pressed 6:4 uniformly mixing.Lignin type water
Coal-slurry dispersing agent prepares method described above, wherein, PH is adjusted to 10, and the temperature for adding acetone is 55 DEG C, adds lignin
Temperature rises to 95 DEG C afterwards.Preparing for polyocarboxy acid type coal water slurry dispersing agent is as follows, weigh isopentene group APEO 300g in
In 1000ml four-hole boiling flasks, 225g deionized waters are added.Weigh 25.3g acrylic acid, 29.6g hydroxy-ethyl acrylates, 1.84g mercaptos
Base propionic acid, 0.72g ascorbic acid are dissolved in 115.4g deionized waters and are made into 1# material, standby.Treat isopentene group APEO normal temperature
25 DEG C are completely dissolved, and potassium peroxydisulfate 1.80g is added at 25 DEG C of normal temperature, after stirring 3min-5min, start that 1# is added dropwise, 1# gobs add 5
Hour, 25 DEG C of normal temperature reacts 1 hour.After moisturizing 137.28g, produce.
Ground from the Yulin lignite and Ordos, inner Mongolia bituminous coal slurrying, coal sample for being not easy into slurry by ball mill
Granularity needed for mill, vibrating sieving machine screening acquisition.For lignite, Texaco gasifier multimodal grading is selected in grain size distribution, and coal particle size is matched somebody with somebody
Than for (being calculated with mass fraction)：20-40 mesh, which accounts for 8%, 40-120 mesh and accounts for 42%, 120-200 and account for 7%, 200-300, accounts for 8%, greatly
35% is accounted in 300.The Compositional type coal water slurry dispersing agent addition is 0.5% (being calculated with the gross mass of coal).Following table is use
The Compositional type coal water slurry dispersing agent and commercially available lignin of the present invention form the performance impact of slurry to lignite.
In summary, the invention has the advantages that：
1st, Compositional type coal water slurry dispersing agent is made up of lignin type coal water slurry dispersing agent and polyocarboxy acid type coal water slurry dispersing agent,
And lignin type dispersant accounts for main component, and raw material is easy to get, and cost is controllable.
2nd, type coal water slurry dispersing agent is synthesized by sulfonation and condensation process；Polyocarboxy acid type coal water slurry dispersing agent is according to free radical
Principle polymerize, and two kinds of coal water slurry dispersing agent synthesis technique is simple, easy to operate.
3rd, the Compositional type coal water slurry dispersing agent is acted synergistically due to two distinct types of dispersant, to being not easy into slurry
Lignite has good paste-forming properties, and slurry has preferably stable and has relatively low viscosity, and volume is few.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (10)
1. a kind of Compositional type coal water slurry dispersing agent, it is characterised in that the Compositional type coal water slurry dispersing agent is by lignin type water coal
Dispersant and polyocarboxy acid type coal water slurry dispersing agent composition are starched, wherein, according to mass fraction, shared by lignin type coal water slurry dispersing agent
Number is 60-90 parts, and number shared by polyocarboxy acid type coal water slurry dispersing agent is 10-40 parts.
A kind of 2. preparation method of Compositional type coal water slurry dispersing agent as claimed in claim 1, it is characterised in that：By lignin type
Coal water slurry dispersing agent and polyocarboxy acid type coal water slurry dispersing agent are prepared respectively, are proportionally stirred, you can compounded
Type coal water slurry dispersing agent；
Wherein, the preparation process of the lignin type coal water slurry dispersing agent is：
A1：Sulfonating agent is dissolved in water, adjusts pH value, the stirring of acetone catalyst is added at 45 DEG C -50 DEG C；
A2：When temperature is 50 DEG C, starts that the formalin that mass fraction is 37% is added dropwise, 0.5-0.6 hours are added dropwise；
A3：Alkali lignin is added, is warming up to 90-95 DEG C, reacts 3-3.5 hours, you can obtain lignin type coal water slurry dispersing agent；
The preparation process of the polyocarboxy acid type coal water slurry dispersing agent is：
B1：Polyethenoxy ether class polymeric monomer is placed in four-hole boiling flask, is stirred at room temperature, is dissolved in water；
B2：Unsaturated carboxylic acid monomer, crylic acid hydroxy ester, reproducibility initiator and chain-transferring agent are dissolved in water, are made into 1# material；
B3：Oxidative initiator is added after polyethenoxy ether class polymeric monomer is completely dissolved, 3-5min is stirred, starts at room temperature
1# material are added dropwise, 1# gobs add 2-5 hours, treat that 1# material are all added dropwise, react 0.5-2 hours, then moisturizing, use at room temperature
Alkaline conditioner regulation PH is 5-7, you can obtains polyocarboxy acid type coal water slurry dispersing agent.
3. the preparation method of Compositional type coal water slurry dispersing agent as claimed in claim 2, it is characterised in that：The sulfonating agent is Asia
Sodium sulphate.
4. the preparation method of Compositional type coal water slurry dispersing agent as claimed in claim 2, it is characterised in that：The APEO
Polymeric monomer is methyl allyl polyoxyethylene ether, isopentene group APEO, one kind in 4- hydroxy butyl vinyl ethers or two
Kind.
5. the preparation method of Compositional type coal water slurry dispersing agent as claimed in claim 4, it is characterised in that：The APEO
The molecular weight of polymeric monomer is 2400,3000 one or two kinds of.
6. the preparation method of Compositional type coal water slurry dispersing agent as claimed in claim 2, it is characterised in that：The unsaturated carboxylic acid
Monomer is one or both of acrylic acid, methacrylic acid, itaconic acid.
7. the preparation method of Compositional type coal water slurry dispersing agent as claimed in claim 2, it is characterised in that：The dihydroxypropyl
Ester is one or both of hydroxy-ethyl acrylate, hydroxypropyl acrylate, hy-droxybutyl.
8. the preparation method of Compositional type coal water slurry dispersing agent as claimed in claim 2, it is characterised in that：The oxidisability triggers
Agent is one or both of hydrogen peroxide, ammonium persulfate, potassium peroxydisulfate, and the reproducibility initiator is ascorbic acid, sulfurous acid
One or both of hydrogen sodium and ferrous sulfate.
9. the preparation method of Compositional type coal water slurry dispersing agent as claimed in claim 2, it is characterised in that：The chain-transferring agent is
One or both of mercaptopropionic acid, TGA and mercaptoethanol.
10. the preparation method of Compositional type coal water slurry dispersing agent as claimed in claim 2, it is characterised in that：The alkalescence regulation
Agent is the sodium hydrate aqueous solution of mass fraction 30%.
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| CN108623230A (en) * | 2018-07-16 | 2018-10-09 | 桐城市景瑞建筑装饰工程有限公司 | A kind of cement-based microporous building material |
| CN109880662A (en) * | 2018-12-24 | 2019-06-14 | 广州建盛建材有限公司 | A kind of composite coal-water fluid dispersing agent and preparation method thereof |
| CN110699133A (en) * | 2019-11-19 | 2020-01-17 | 安徽鑫固环保股份有限公司 | Coal water slurry dispersing agent synthesized by using petroleum waste phenol residues and synthesis method thereof |
| CN110760352A (en) * | 2019-11-19 | 2020-02-07 | 安徽鑫固环保股份有限公司 | Coal water slurry dispersant prepared from modified molasses and preparation method thereof |
| CN110804471A (en) * | 2019-11-19 | 2020-02-18 | 安徽鑫固环保股份有限公司 | Sodium styrene sulfonate modified comb-type coal water slurry dispersing agent and preparation method thereof |
| CN110819403A (en) * | 2019-11-19 | 2020-02-21 | 安徽鑫固环保股份有限公司 | Modified novel water-coal-slurry dispersant and synthetic method thereof |
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| CN110819401A (en) * | 2019-11-19 | 2020-02-21 | 安徽鑫固环保股份有限公司 | Maltodextrin modified coal water slurry dispersing agent and synthetic method thereof |
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| CN110819406A (en) * | 2019-11-19 | 2020-02-21 | 安徽鑫固环保股份有限公司 | Coal water slurry dispersing agent prepared by using modified sodium lignosulfonate and preparation method thereof |
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| CN110846092A (en) * | 2019-11-19 | 2020-02-28 | 安徽鑫固环保股份有限公司 | Acrylamide modified comb-type coal water slurry dispersant and application thereof |
| CN113817177A (en) * | 2021-07-16 | 2021-12-21 | 兖矿新疆煤化工有限公司 | Modified lignosulfonate dispersant, preparation method and application in coal water slurry |
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| CN110819405A (en) * | 2019-11-19 | 2020-02-21 | 安徽鑫固环保股份有限公司 | Modified comb-type coal water slurry dispersing agent prepared from hydroxypropyl cellulose and preparation method |
| CN110819401A (en) * | 2019-11-19 | 2020-02-21 | 安徽鑫固环保股份有限公司 | Maltodextrin modified coal water slurry dispersing agent and synthetic method thereof |
| CN110819404A (en) * | 2019-11-19 | 2020-02-21 | 安徽鑫固环保股份有限公司 | Method for modifying sparse type coal water slurry dispersing agent by aspartic acid |
| CN110819406A (en) * | 2019-11-19 | 2020-02-21 | 安徽鑫固环保股份有限公司 | Coal water slurry dispersing agent prepared by using modified sodium lignosulfonate and preparation method thereof |
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| CN110846092A (en) * | 2019-11-19 | 2020-02-28 | 安徽鑫固环保股份有限公司 | Acrylamide modified comb-type coal water slurry dispersant and application thereof |
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Application publication date: 20180410 |