CN110255960B - Anti-settling agent and preparation method and application thereof - Google Patents

Anti-settling agent and preparation method and application thereof Download PDF

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Publication number
CN110255960B
CN110255960B CN201910291034.3A CN201910291034A CN110255960B CN 110255960 B CN110255960 B CN 110255960B CN 201910291034 A CN201910291034 A CN 201910291034A CN 110255960 B CN110255960 B CN 110255960B
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agent
settling agent
amount
settling
mass
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CN110255960A (en
Inventor
谭洪波
张迅
邓秀峰
李懋高
聂康峻
贺行洋
苏英
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Jiangxi new era Concrete Co.,Ltd.
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Wuhan University of Technology WUT
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K23/00—Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The invention provides an anti-settling agent and a preparation method and application thereof, wherein the anti-settling agent is formed by mixing a thickening agent, a dispersing agent and sodium gluconate; the mass ratio of the thickening agent to the dispersing agent is (10-50) to 1; the dosage of the sodium gluconate is 2-5% of the total dosage of the thickener and the dispersant. The anti-settling agent disclosed by the invention takes the thickener with a physical adsorption effect and the dispersant with high charge density as main raw materials, and is compounded with sodium gluconate, so that the anti-settling agent has a higher anti-settling effect.

Description

Anti-settling agent and preparation method and application thereof
Technical Field
The invention relates to the technical field of additives, in particular to an anti-settling agent and a preparation method and application thereof.
Background
The residue of ore after beneficiation or smelting is called slag, is a typical solid waste, mostly contains high contents of Ca, Al and Si, and has both pozzolanic activity and latent hydraulic property, so that the slag is mostly used as an active mixed material added into cement. Wherein, the granulated blast furnace slag is also the active mixed material with the largest dosage and the best quality in the domestic cement industry at present.
However, slag, although somewhat reactive, is slowly released and therefore an alkali activator, such as Ca (OH), is usually added to activate its activity2And the like, but the effect is not satisfactory. The slag is usually further ground to improve its reactivity, but it is difficult to further grind and energy consumption is high after the ore powder particle size reaches 6-7 μm in ordinary dry grinding, and it can be ground to 2 by wet grinding method3 μm or even finer and with far lower energy consumption than dry grinding, wet grinding is therefore usually used to reduce the slag particle size, but the problem with wet grinding is that the ore fines can settle significantly, which in turn affects the working properties, even the mechanical properties, of the wet ground slag slurry.
Therefore, the development of an anti-settling agent suitable for wet grinding of slag slurry is of great significance.
Disclosure of Invention
In view of the above, the invention aims to provide an anti-settling agent to solve the problem that the existing wet-grinding slag slurry is easy to settle in the wet grinding process.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an anti-settling agent is prepared by mixing a thickening agent, a dispersing agent and sodium gluconate; the mass ratio of the thickening agent to the dispersing agent is (10-50) to 1; the dosage of the sodium gluconate is 2-5% of the total dosage of the thickener and the dispersant.
Optionally, the thickening agent comprises welan gum, xanthan gum, and konjac gum; the mass ratio of the welan gum to the xanthan gum to the konjac gum is (1-2) to (1-4) to (1-3).
Optionally, the dispersant is a dispersant prepared by the following method:
mixing acrylic acid and sodium methallyl sulfonate to prepare an aqueous solution;
and adding ammonium persulfate and 2-mercaptoethanol into the aqueous solution, heating for a period of time at a certain temperature, and cooling to obtain the dispersing agent.
Optionally, the mass ratio of the acrylic acid to the sodium methallyl sulfonate is 1: (1.8-2.0).
Optionally, the amount of the ammonium persulfate is 0.1-0.2% of the total amount of the acrylic acid and the sodium methallyl sulfonate; the dosage of the 2-mercaptoethanol is 0.1-0.2% of the total dosage of the acrylic acid and the sodium methallyl sulfonate.
Optionally, the heating temperature is 30-60 ℃, and the heating time is 1-3 h.
A second object of the present invention is to provide a process for the preparation of the above anti-settling agent, comprising the steps of:
and mixing the thickening agent and the dispersing agent, adding the sodium gluconate, and continuously mixing to obtain the anti-settling agent.
A third object of the present invention is to provide a use of the above anti-settling agent in wet grinding slag slurry, in which the amount of the anti-settling agent is 0.5 to 1.5% of the amount of the wet grinding slag slurry.
Compared with the prior art, the anti-settling agent has the following advantages:
1. the anti-settling agent disclosed by the invention takes the thickener with a physical adsorption effect and the dispersant with high charge density as main raw materials, and is compounded with sodium gluconate, so that the anti-settling agent has a higher anti-settling effect.
2. The anti-settling agent has simple preparation process, easy control of the preparation process and easy industrial application and popularization.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail with reference to examples.
Example 1
An anti-settling agent is prepared by mixing a thickening agent, a dispersing agent and sodium gluconate; the mass ratio of the thickening agent to the dispersing agent is 10: 1; the amount (mass) of the sodium gluconate is 2% of the total amount (mass) of the thickener and the dispersant. The thickening agent in the embodiment is a thickening agent with a physical adsorption effect, can adsorb the connecting particles, plays a role in water fixation and retention, can increase the consistency, and is beneficial to forming of wet-milled slag; the dispersing agent is a dispersing agent with high charge density, can be strongly adsorbed on the surface of slag particles, reduces the surface energy, provides strong electric repulsion force, steric hindrance and surface lubrication, and realizes efficient dispersion and de-agglomeration of nano-micro particles, so that the anti-settling agent has a good anti-settling effect; the sodium gluconate has the function of retarding coagulation and can prevent the wet-grinding slag slurry from being coagulated too early.
Wherein the thickening agent comprises three macromolecular vegetable gums, namely welan gum, xanthan gum and konjac gum, which are all 0.1% in mass fraction; the mass ratio of the welan gum to the xanthan gum to the konjac gum is 1: 4: 3. In this example, the thickener was prepared by mixing xanthan gum, konjac gum, and welan gum.
Also, in this example, the dispersant was prepared by the following method:
mixing acrylic acid and sodium methallyl sulfonate according to the mass ratio of 1: 1.8 to prepare an aqueous solution, and adding the aqueous solution into a reaction kettle;
adding ammonium persulfate and 2-mercaptoethanol into the aqueous solution, heating and preserving heat for 1h at 60 ℃, continuously stirring at a certain stirring speed in the heating and preserving heat process for improving the reaction rate and the reaction degree, and cooling to obtain a dispersing agent, wherein the using amount (mass) of the ammonium persulfate is 0.1% of the total using amount (total mass) of the acrylic acid and the sodium methallyl sulfonate; the amount (mass) of 2-mercaptoethanol is 0.2% of the total amount (mass) of acrylic acid and sodium methallyl sulfonate
In this embodiment, the anti-settling agent can be prepared by the following method:
and (3) uniformly mixing the thickening agent and the dispersing agent according to the mass ratio, adding sodium gluconate, and continuously and uniformly mixing to obtain the anti-settling agent.
The anti-settling agent of the present example was used for anti-settling of wet grinding slag slurry, and in this application, the amount (mass) of the anti-settling agent was 0.5% of the amount (mass) of the wet grinding slag slurry.
Example 2
This example differs from example 1 in that: the mass ratio of the thickening agent to the dispersing agent in the anti-settling agent is 20: 1; the amount (mass) of the sodium gluconate is 3% of the total amount (mass) of the thickener and the dispersant.
The mass ratio of the welan gum, the xanthan gum and the konjac gum in the thickening agent is 2: 4: 3.
In the preparation process of the dispersing agent, the mass ratio of the acrylic acid to the sodium methallyl sulfonate is 1: 2, and the using amount (mass) of the ammonium persulfate is 0.1 percent of the total using amount (total mass) of the acrylic acid and the sodium methallyl sulfonate; the amount (mass) of 2-mercaptoethanol was 0.1% of the total amount (mass) of acrylic acid and sodium methallyl sulfonate.
The anti-settling agent of the present example was used for anti-settling of wet grinding slag slurry, and in this application, the amount (mass) of the anti-settling agent was 0.7% of the amount (mass) of the wet grinding slag slurry.
Example 3
This example differs from example 1 in that: the mass ratio of the thickening agent to the dispersing agent in the anti-settling agent is 30: 1; the amount (mass) of the sodium gluconate is 4% of the total amount (mass) of the thickener and the dispersant.
The mass ratio of the welan gum, the xanthan gum and the konjac gum in the thickening agent is 1: 3: 2.
In the preparation process of the dispersing agent, the mass ratio of the acrylic acid to the sodium methallyl sulfonate is 1: 1.8, and the using amount (mass) of the ammonium persulfate is 0.2 percent of the total using amount (total mass) of the acrylic acid and the sodium methallyl sulfonate; the amount (mass) of 2-mercaptoethanol was 0.1% of the total amount (mass) of acrylic acid and sodium methallyl sulfonate.
The anti-settling agent of the present example was used for anti-settling of wet grinding slag slurry, and in this application, the amount (mass) of the anti-settling agent was 1.0% of the amount (mass) of the wet grinding slag slurry.
Example 4
This example differs from example 1 in that: the mass ratio of the thickening agent to the dispersing agent in the anti-settling agent is 50: 1; the amount (mass) of the sodium gluconate is 5% of the total amount (mass) of the thickener and the dispersant.
The mass ratio of the welan gum, the xanthan gum and the konjac gum in the thickening agent is 1: 4: 2.
In the preparation process of the dispersing agent, the mass ratio of the acrylic acid to the sodium methallyl sulfonate is 1: 2, and the using amount (mass) of the ammonium persulfate is 0.2 percent of the total using amount (total mass) of the acrylic acid and the sodium methallyl sulfonate; the amount (mass) of 2-mercaptoethanol was 0.2% of the total amount (mass) of acrylic acid and sodium methallyl sulfonate.
The anti-settling agent of the present example was used for anti-settling of wet grinding slag slurry, and in this application, the amount (mass) of the anti-settling agent was 1.5% of the amount (mass) of the wet grinding slag slurry.
Example 5
This example differs from example 1 in that: the mass ratio of the thickening agent to the dispersing agent in the anti-settling agent is 20: 1; the amount (mass) of the sodium gluconate is 3% of the total amount (mass) of the thickener and the dispersant.
The mass ratio of the welan gum, the xanthan gum and the konjac gum in the thickening agent is 1: 4: 3.
In the preparation process of the dispersing agent, the mass ratio of the acrylic acid to the sodium methallyl sulfonate is 1: 2, and the using amount (mass) of the ammonium persulfate is 0.1 percent of the total using amount (total mass) of the acrylic acid and the sodium methallyl sulfonate; the amount (mass) of 2-mercaptoethanol was 0.1% of the total amount (mass) of acrylic acid and sodium methallyl sulfonate.
The anti-settling agent of the present example was used for anti-settling of wet grinding slag slurry, and in this application, the amount (mass) of the anti-settling agent was 0.5% of the amount (mass) of the wet grinding slag slurry.
Example 6
This example differs from example 1 in that: the mass ratio of the thickening agent to the dispersing agent in the anti-settling agent is 30: 1; the amount (mass) of the sodium gluconate is 5% of the total amount (mass) of the thickener and the dispersant.
The mass ratio of the welan gum, the xanthan gum and the konjac gum in the thickening agent is 1: 4: 2.
In the preparation process of the dispersing agent, the mass ratio of the acrylic acid to the sodium methallyl sulfonate is 1: 1.8, and the using amount (mass) of the ammonium persulfate is 0.2 percent of the total using amount (total mass) of the acrylic acid and the sodium methallyl sulfonate; the amount (mass) of 2-mercaptoethanol was 0.1% of the total amount (mass) of acrylic acid and sodium methallyl sulfonate.
The anti-settling agent of the present example was used for anti-settling of wet grinding slag slurry, and in this application, the amount (mass) of the anti-settling agent was 1.0% of the amount (mass) of the wet grinding slag slurry.
The density difference of the wet-milled slag slurry doped with the anti-settling agent of examples 1 to 6 was tested with reference to GB/T19139-2012 measurements, the 28d strength ratio of the wet-milled slag slurry doped with examples 1 to 6 was tested with reference to standard GB8076-2008, which was compared with a wet-milled slag slurry not doped with the anti-settling agent of the present invention (comparative example), wherein the water-to-solid ratio in the wet-milled slag slurry was 0.5. The test results are shown in table 1.
As can be seen from Table 1, after the anti-settling agent of the embodiment 1 to the embodiment 6 is added, the difference of the upper density and the lower density of the wet-grinding slag slurry is effectively reduced, the later strength of the wet-grinding slag slurry can still be maintained and even can be increased to a certain extent, and the anti-settling agent has a value of large-scale popularization.
TABLE 1
Figure BDA0002024917240000071
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. An anti-settling agent is characterized in that the anti-settling agent is formed by mixing a thickening agent, a dispersing agent and sodium gluconate; the mass ratio of the thickening agent to the dispersing agent is (10-50) to 1; the dosage of the sodium gluconate is 2-5% of the total dosage of the thickener and the dispersant;
the thickening agent comprises welan gum, xanthan gum and konjac gum; the mass ratio of the welan gum to the xanthan gum to the konjac gum is (1-2) to (1-4) to (1-3);
the dispersant is prepared by the following method:
mixing acrylic acid and sodium methallyl sulfonate to prepare an aqueous solution;
and adding ammonium persulfate and 2-mercaptoethanol into the aqueous solution, heating for a period of time at a certain temperature, and cooling to obtain the dispersing agent.
2. The anti-settling agent according to claim 1, wherein the mass ratio of the acrylic acid to the sodium methallyl sulfonate is 1 to (1.8-2.0).
3. Anti-settling agent according to claim 1, wherein the amount of ammonium persulfate is 0.1-0.2% of the total amount of acrylic acid and sodium methallyl sulfonate; the dosage of the 2-mercaptoethanol is 0.1-0.2% of the total dosage of the acrylic acid and the sodium methallyl sulfonate.
4. Anti-settling agent according to claim 1, wherein the heating is carried out at a temperature of 30-60 ℃ for a time of 1-3 h.
5. A process for the preparation of an anti-settling agent according to any of claims 1 to 4, comprising the steps of:
and mixing the thickening agent and the dispersing agent, adding the sodium gluconate, and continuously mixing to obtain the anti-settling agent.
6. Use of an anti-settling agent according to any of claims 1 to 4 in wet milling slag slurry, characterized in that the amount of the anti-settling agent is 0.5-1.5% of the amount of the wet milling slag slurry.
CN201910291034.3A 2019-04-11 2019-04-11 Anti-settling agent and preparation method and application thereof Active CN110255960B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09118554A (en) * 1995-10-26 1997-05-06 Shin Etsu Chem Co Ltd High fluidity concrete
CN1724447A (en) * 2005-06-09 2006-01-25 武汉理工大学 Water reducing agent of poly carboxylic acid series concrete and its preparation process
CN101337796A (en) * 2008-07-15 2009-01-07 中国海洋石油总公司 Liquid cement mortar capable of being stored
CN103951335A (en) * 2013-12-13 2014-07-30 中铁十四局集团有限公司 Synchronous grouting method for recycling large-diameter waste slurry generated during slurry shield
CN105776944A (en) * 2016-03-08 2016-07-20 上海英杉新材料科技有限公司 Cement base rheological stabilizing agent and preparation method and application thereof
CN106082942A (en) * 2016-06-15 2016-11-09 浙江广天构件股份有限公司 Shield-tunneling construction grouting serous fluid
CN107963867A (en) * 2017-12-27 2018-04-27 北京宝辰联合科技股份有限公司 A kind of gravity flowing levelling mortar

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09118554A (en) * 1995-10-26 1997-05-06 Shin Etsu Chem Co Ltd High fluidity concrete
CN1724447A (en) * 2005-06-09 2006-01-25 武汉理工大学 Water reducing agent of poly carboxylic acid series concrete and its preparation process
CN101337796A (en) * 2008-07-15 2009-01-07 中国海洋石油总公司 Liquid cement mortar capable of being stored
CN103951335A (en) * 2013-12-13 2014-07-30 中铁十四局集团有限公司 Synchronous grouting method for recycling large-diameter waste slurry generated during slurry shield
CN105776944A (en) * 2016-03-08 2016-07-20 上海英杉新材料科技有限公司 Cement base rheological stabilizing agent and preparation method and application thereof
CN106082942A (en) * 2016-06-15 2016-11-09 浙江广天构件股份有限公司 Shield-tunneling construction grouting serous fluid
CN107963867A (en) * 2017-12-27 2018-04-27 北京宝辰联合科技股份有限公司 A kind of gravity flowing levelling mortar

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Effective date of registration: 20221221

Address after: 330000 West of Radio 561, Wuxi Village, Machu Town, Nanchang Hi tech Industrial Development Zone, Jiangxi Province

Patentee after: Jiangxi new era Concrete Co.,Ltd.

Address before: 430070 Hubei Province, Wuhan city Hongshan District Luoshi Road No. 122

Patentee before: WUHAN University OF TECHNOLOGY