CN115093137A - Cement grinding aid and preparation method thereof - Google Patents
Cement grinding aid and preparation method thereof Download PDFInfo
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- CN115093137A CN115093137A CN202210717223.4A CN202210717223A CN115093137A CN 115093137 A CN115093137 A CN 115093137A CN 202210717223 A CN202210717223 A CN 202210717223A CN 115093137 A CN115093137 A CN 115093137A
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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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/48—Clinker treatment
- C04B7/52—Grinding ; After-treatment of ground cement
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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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
Abstract
The invention belongs to the technical field of inorganic non-metallic materials, and particularly relates to a cement grinding aid and a preparation method thereof. The cement grinding aid provided by the invention comprises the following components in percentage by mass: 12 to 27 percent of fly ash, 4 to 12 percent of sulphoaluminate cement, 4 to 12 percent of calcium saccharate, 2 to 6 percent of glycerol, 8 to 17 percent of rice hull ash, 1.5 to 3.5 percent of synergistic liquid, 33 to 53 percent of anhydrous sodium sulphate and 4 to 12 percent of organic acid salt; the preparation raw materials of the synergistic liquid comprise the following components: diethanol monoisopropanolamine, an acid reagent, a foaming agent and water. The results of the examples show that the cement grinding aid provided by the invention can improve the strength performance of cement, improve the grinding efficiency, reduce the dosage of cement clinker and has good grinding aid effect.
Description
Technical Field
The invention belongs to the technical field of inorganic non-metallic materials, and particularly relates to a cement grinding aid and a preparation method thereof.
Background
At present, in a cement production process, cement grinding is the link with the highest energy consumption, and accounts for more than two thirds of the total power consumption of the production process, wherein most of energy is dissipated in a heat form, and when the cement granularity is small to a certain value, fine particles of cement can agglomerate, so that the powder selection efficiency of the cement is reduced. In order to solve the problems, increase the strength of cement, increase the amount of mixed materials and reduce the cost, technicians select a cement grinding aid to be added into the cement.
The existing cement grinding aids are mainly divided into powder cement grinding aids and liquid cement grinding aids. The powder grinding aid contains anhydrous sodium sulphate, powder grinding aid mother liquor, industrial salt, fly ash, triethanolamine and other components, can improve the grinding efficiency of cement, but has limited improvement on the strength of the cement, and cannot improve the early strength and the later strength of the cement at the same time.
Disclosure of Invention
The cement grinding aid provided by the invention can simultaneously improve the early strength and the later strength of cement, improve the grinding efficiency, reduce the consumption of cement clinker, and has good grinding aid effect and excellent chemical stability.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a cement grinding aid which comprises the following components in percentage by mass: 12 to 27 percent of fly ash, 4 to 12 percent of sulphoaluminate cement, 4 to 12 percent of calcium saccharate, 2 to 6 percent of glycerol, 8 to 17 percent of rice hull ash, 1.5 to 3.5 percent of synergistic liquid, 33 to 53 percent of anhydrous sodium sulphate and 4 to 12 percent of organic acid salt; the preparation raw materials of the synergistic liquid comprise the following components: diethanol monoisopropanolamine, an acid reagent, a foaming agent and water.
Preferably, the cement grinding aid comprises the following components in percentage by mass: 16-24% of fly ash, 6-10% of sulphoaluminate cement, 5-9% of calcium saccharate, 3-5% of glycerol, 9-15% of rice hull ash, 2-3% of synergistic liquid, 38-48% of anhydrous sodium sulphate and 5-11% of organic acid salt.
Preferably, the cement grinding aid comprises the following components in percentage by mass: 16% of fly ash, 8% of sulphoaluminate cement, 8% of calcium saccharate, 4% of glycerol, 12% of rice hull ash, 3% of synergistic liquid, 39% of anhydrous sodium sulphate and 10% of organic acid salt.
Preferably, the organic acid salt includes one or more of calcium gluconate, sodium oxalate, calcium oxalate and calcium formate.
Preferably, the preparation method of the synergistic solution comprises the following steps: mixing diethanolisopropanolamine and an acid reagent for reaction to obtain an intermediate product; and mixing the intermediate product, a foaming agent and water to obtain the synergistic liquid.
Preferably, the mass ratio of the diethanolisopropanolamine to the acid reagent is 1.5-5: 1.
Preferably, the mass ratio of the intermediate product to the foaming agent is 10-15: 1.
Preferably, the temperature for mixing the diethanol monoisopropanolamine and the acid reagent is 50-100 ℃ and the time is 10-15 min.
Preferably, the mixing time of the intermediate product, the foaming agent and the water is 10-50 min.
The invention also provides a preparation method of the cement grinding aid, which comprises the following steps:
(1) mixing fly ash, anhydrous sodium sulphate, calcium saccharate, glycerol, organic acid salt and rice hull ash to obtain premix;
(2) mixing the premix and the synergistic solution to obtain a mixture;
(3) and mixing the mixture with sulphoaluminate cement to obtain the cement grinding aid.
The invention provides a cement grinding aid which comprises the following components in percentage by mass: 12 to 27 percent of fly ash, 4 to 12 percent of sulphoaluminate cement, 4 to 12 percent of calcium saccharate, 2 to 6 percent of glycerol, 8 to 17 percent of rice hull ash, 1.5 to 3.5 percent of synergistic liquid, 33 to 53 percent of anhydrous sodium sulphate and 4 to 12 percent of organic acid salt; the raw materials for preparing the synergistic liquid comprise the following components: diethanol monoisopropanolamine, an acid reagent, a foaming agent and water. The cement grinding aid provided by the invention contains the components such as calcium saccharate, glycerin, rice hull ash, synergistic liquid, organic acid salt and the like, can improve the flowability of powder, effectively inhibit polar macromolecules of cement agglomeration, reduce crack closure of materials, accelerate crack expansion, further enter a defective structure of cement to form columnar ettringite, lamellar calcium hydroxide crystals and reticular and fibrous gel, the structures can generate structure superposition effect, reduce the discreteness and structural defects of cement particles, generate internal stress to reduce cement grinding difficulty, improve the strength performance and grinding efficiency of cement, reduce energy consumption and cement clinker consumption, effectively improve the particle fineness of the powder, have good grinding aid effect and excellent chemical stability, do not contain chloride ions, do not influence the content of chloride ions in the cement, and have better using effect when being matched with a conventional liquid cement grinding aid, the economic benefit is good.
The invention also provides a preparation method of the cement grinding aid. The preparation method provided by the invention can be carried out at normal temperature, and has the advantages of simple steps, high preparation efficiency, readily available raw materials and low cost.
Detailed Description
The invention provides a cement grinding aid which comprises the following components in percentage by mass: 12 to 27 percent of fly ash, 4 to 12 percent of sulphoaluminate cement, 4 to 12 percent of calcium saccharate, 2 to 6 percent of glycerol, 8 to 17 percent of rice hull ash, 1.5 to 3.5 percent of synergistic liquid, 33 to 53 percent of anhydrous sodium sulphate and 4 to 12 percent of organic acid salt; the preparation raw materials of the synergistic liquid comprise the following components: diethanol monoisopropanolamine, an acid reagent, a foaming agent and water.
Unless otherwise specified, each raw material used in the present invention is a commercially available product.
The cement grinding aid comprises 12-27% of fly ash, preferably 16-24% of fly ash, and more preferably 16% of fly ash. In the invention, the fly ash is used as an active admixture, so that the grinding aid can play a role in grinding aid and improve the overall fluidity of the grinding aid.
The cement grinding aid comprises 4-12% of sulphoaluminate cement, preferably 6-10% of sulphoaluminate cement, and more preferably 8% of sulphoaluminate cement in percentage by mass. In the present invention, the sulphoaluminate cement may excite the early strength and the late strength of the cement.
The cement grinding aid comprises, by mass, 4% -12% of calcium saccharate, preferably 5% -9%, and more preferably 8%. In the invention, the calcium saccharate has the effect of grinding aid.
The cement grinding aid comprises 2-6% of glycerol, preferably 3-5% of glycerol, and more preferably 4% of glycerol by mass percentage. In the present invention, glycerin has a grinding-aiding effect.
The cement grinding aid comprises 8-17% of rice hull ash, preferably 9-15% of rice hull ash, and more preferably 12% of rice hull ash by mass percentage. In the invention, the rice hull ash can improve the grinding-assisting effect, has a composite effect with calcium saccharate and glycerol, and improves the early strength of cement; in addition, the cost of the rice hull ash is low, and the comprehensive cost of the cement grinding aid can be reduced.
The cement grinding aid comprises 33-53% of anhydrous sodium sulphate, preferably 38-48% of anhydrous sodium sulphate, and more preferably 39% of anhydrous sodium sulphate. In the invention, the anhydrous sodium sulphate can excite the early strength of the cement, improve the fluidity of the cement and reduce the grinding difficulty.
The cement grinding aid comprises 4-12% of organic acid salt, preferably 5-11% and more preferably 10% by mass percentage; the organic acid salt preferably comprises one or more of calcium gluconate, sodium oxalate, calcium oxalate and calcium formate. In the present invention, the organic acid salt functions to stimulate the early strength of cement and simultaneously to improve the fluidity of cement.
The cement grinding aid comprises 1.5-3.5% of synergistic liquid, preferably 2-3%, and more preferably 3% by mass; the preparation raw materials of the synergistic liquid comprise the following components: diethanol monoisopropanolamine, an acid reagent, a foaming agent and water. In the invention, the synergistic liquid can prevent the closing of the cracks of the material and accelerate the expansion of the cracks, and meanwhile, the synergistic liquid can be adsorbed on the surface of the material to prevent the material from adhering or agglomerating and improve the fluidity of the material, thereby improving the grinding efficiency and reducing the fineness of the material.
In the present invention, the preparation method of the synergistic solution preferably comprises the following steps: mixing diethanolisopropanolamine and an acid reagent to obtain an intermediate product; and mixing the intermediate product, a foaming agent and water to obtain the synergistic liquid. In the invention, the mass ratio of the diethanolisopropanolamine to the acid reagent is preferably 1.5-5: 1, more preferably 2-4.5: 1, and further preferably 3-4: 1; the acid reagent is preferably an inorganic acid, and the inorganic acid preferably comprises one or more of hydrochloric acid and sulfuric acid; the mass concentration of the hydrochloric acid is preferably 28-32%, more preferably 30%, and the concentration of the sulfuric acid is preferably 45-55%, more preferably 50%; in a specific embodiment of the invention, the sulfuric acid may be a waste sulfuric acid solution, and the source of the waste sulfuric acid solution preferably includes one or both of a waste sulfuric acid solution generated in the production process of the electronic semiconductor industry and a waste sulfuric acid solution generated in the production process of chloral; the foaming agent preferably comprises one or more of a foaming agent K12, a foaming agent AOS and a foaming agent T50; the reaction temperature is preferably 50-100 ℃, more preferably 60-80 ℃, and the reaction time is preferably 0.3-0.5 h, more preferably 0.4-0.5 h. In the present invention, the diethanolisopropanolamine and the acid agent are preferably mixed in a manner that: adding diethanol monoisopropanolamine into a reaction kettle, slowly adding hydrochloric acid while stirring, uniformly stirring, slowly adding sulfuric acid waste liquid, and uniformly stirring to obtain an intermediate product; the rate of adding the hydrochloric acid is preferably 120-150 kg/min, and more preferably 130-140 kg/min; the speed of adding the sulfuric acid waste liquid is preferably 100-140 kg/min, and more preferably 110-120 kg/min.
In the invention, the mass ratio of the intermediate product to the foaming agent is preferably 10-15: 1, and more preferably 12-15: 1; the mass ratio of the intermediate product to water is preferably 0.5-2: 1, and more preferably 0.5-2: 1; the mixing temperature of the intermediate product, the foaming agent and water is preferably 40-60 ℃, more preferably 40-50 ℃, and the mixing time is preferably 10-50 min, more preferably 20-40 min. In the present invention, the intermediate, the foaming agent and water are preferably mixed in the following manner: slowly adding water into the intermediate product, uniformly stirring, and then adding the foaming agent while stirring until the foaming agent is completely dissolved; the rate of adding water is preferably 80-110 kg/min, more preferably 90-100 kg/min.
In the specific embodiment of the invention, the cement grinding aid provided by the invention is matched with a liquid grinding aid sold in the market, so that the grinding aid effect of the grinding aid can be more remarkably improved.
The invention also provides a preparation method of the cement grinding aid, which comprises the following steps:
(1) mixing fly ash, anhydrous sodium sulphate, calcium saccharate, glycerol, organic acid salt and rice hull ash to obtain premix;
(2) mixing the premix and the synergistic solution to obtain a mixture;
(3) and mixing the mixture with sulphoaluminate cement to obtain the cement grinding aid.
The invention mixes the fly ash, anhydrous sodium sulphate, calcium saccharate, glycerin, organic acid salt and rice hull ash to obtain the premix. In the present invention, the mixing is preferably stirring; the stirring speed is preferably 30-60 rpm, more preferably 40-50 rpm, the temperature is preferably normal temperature, and the time is preferably 30-60 min, more preferably 40-50 min.
After the premix is obtained, the premix and the synergistic liquid are mixed to obtain a mixture. In the present invention, the mixing is preferably stirring; the stirring speed is preferably 30-60 rpm, more preferably 40-50 rpm, the temperature is preferably normal temperature, and the time is preferably 30-60 min, more preferably 40-50 min.
After the mixture is obtained, the mixture is mixed with the sulphoaluminate cement to obtain the cement grinding aid. In the present invention, the mixing is preferably stirring; the stirring speed is preferably 30-60 rpm, more preferably 40-50 rpm, the temperature is preferably normal temperature, and the time is preferably 30-60 min, more preferably 40-50 min.
The method for applying the cement grinding aid is not particularly required, and the cement grinding aid can be applied by adopting a method well known to a person skilled in the art, and in the specific embodiment of the invention, the cement grinding aid is preferably applied by the following method: and mixing the cement grinding aid, clinker, gypsum and the mixed material to obtain a mixture, controlling the water content of the mixture to be less than or equal to 1.5%, and then grinding. In the invention, the mass percentage content of the cement grinding aid in the mixture is preferably 0.2-0.5%, and more preferably 0.3-0.4%; the mixed material preferably comprises one or more of coal gangue, limestone, slag, shale and burnt stone powder; the mass metering equipment for the cement grinding aid, the clinker, the gypsum and the mixed material preferably comprises a metering screw, a small-sized electric vibration machine or a microcomputer for metering; the mixture is preferably added into a material conveying belt or a coarse powder return screw of a powder concentrator; the grinding equipment is preferably a cement ball mill; the mass percentage of the water content of the mixture is preferably 0.1-1.5%, and more preferably 0.5-1.2%.
In order to further illustrate the present invention, the following examples are given as illustrative embodiments of the present invention and should not be construed as limiting the scope of the present invention.
Example 1
Adding 1.5kg of diethanol monoisopropanolamine into a special reaction kettle, slowly adding 1kg of hydrochloric acid while stirring, controlling the adding time of 30 wt% of hydrochloric acid to be 10min, slowly adding 50 wt% of sulfuric acid waste liquid after the hydrochloric acid is added, heating to 60 ℃, and stirring for 10min to obtain an intermediate product;
adding 1kg of the intermediate product into 1kg of water, stirring uniformly, adding 0.2kg of foaming agent K12 while stirring until the foaming agent is completely dissolved, and continuously stirring for 5min until the foaming agent is uniform to obtain synergistic solution;
1.5kg of fly ash, 4.6kg of anhydrous sodium sulphate, 0.5kg of calcium saccharate, 0.3kg of glycerol, 0.8kg of calcium gluconate and 1.5kg of rice hull ash are added into a stirrer to be uniformly stirred, then 0.3kg of synergistic liquid is added, the massive solid formed after the synergistic liquid is added is smashed and uniformly stirred, then 0.5kg of sulphoaluminate cement is added to be uniformly stirred, and the cement grinding aid (D-1) is obtained.
10kg of materials are mixed according to the proportion of 85 percent of clinker, 5 percent of gypsum and 10 percent of coal gangue and ground for 20min to obtain cement A 1 (ii) a 10kg of materials are mixed according to the proportion of 85 percent of clinker, 5 percent of gypsum, 10 percent of mixed materials and 0.5 percent of powder grinding aid sold in the market, and the mixture is ground for 20min to obtain cement A 2 (ii) a 10kg of materials are mixed according to the proportion of 85 percent of clinker, 5 percent of gypsum, 10 percent of mixed materials and 0.5 percent of cement grinding aid (D-1) of the invention, and the mixture is ground for 20min to obtain cement A 3 (ii) a 10kg of materials are mixed and powdered according to the proportion of 80 percent of clinker, 5 percent of gypsum, 15 percent of mixed materials and 0.5 percent of cement grinding aid (D-1) of the inventionGrinding for 20min to obtain cement A 4 。
Example 2
Adding 4kg of diethanol monoisopropanolamine into a special reaction kettle, slowly adding 2kg of hydrochloric acid while stirring, controlling the adding time of 30 wt% of hydrochloric acid to be 15min, slowly adding 50 wt% of sulfuric acid waste liquid after the hydrochloric acid is added, heating to 70 ℃, and stirring for 15min to obtain an intermediate product.
And adding 1kg of the intermediate product into 1kg of water, uniformly stirring, adding 0.2kg of foaming agent AOS while stirring until the foaming agent AOS is completely dissolved, and continuously stirring for 8min until the foaming agent AOS is uniformly dissolved to obtain the synergistic solution.
1.9kg of fly ash, 4.25kg of anhydrous sodium sulphate, 0.7kg of calcium saccharate, 0.4kg of glycerol, 0.7kg of sodium gluconate and 1.1kg of rice hull ash are added into a stirrer to be uniformly stirred, 0.25kg of synergistic liquid is added, the massive solid formed after the synergistic liquid is added is smashed and uniformly stirred, 0.7kg of sulphoaluminate cement is added to be uniformly stirred, and the cement grinding aid (D-2) is obtained.
10kg of materials are proportioned according to the proportion of 85 percent of clinker, 5 percent of gypsum and 10 percent of limestone and ground for 20min to obtain cement B 1 (ii) a 10kg of materials are mixed according to the proportion of 85 percent of clinker, 5 percent of gypsum, 10 percent of limestone and 0.3 percent of powder grinding aid sold in the market, and the mixture is ground for 20min to obtain cement B 2 (ii) a 10kg of materials are mixed according to the proportion of 85 percent of clinker, 5 percent of gypsum, 10 percent of limestone and 0.3 percent of cement grinding aid (D-2) of the invention and ground for 20min to obtain cement B 3 (ii) a 10kg of materials are mixed according to the proportion of 80 percent of clinker, 5 percent of gypsum, 15 percent of limestone and 0.3 percent of cement grinding aid (D-2) of the invention and ground for 20min to obtain cement B 4 。
Example 3
Adding 3kg of diethanol monoisopropanolamine into a special reaction kettle, slowly adding 1kg of hydrochloric acid while stirring, controlling the adding time of 30 wt% of hydrochloric acid to be 15min, slowly adding 50 wt% of sulfuric acid waste liquid after the hydrochloric acid is added, heating to 70 ℃, and stirring for 10min to obtain an intermediate product.
And adding 1kg of the intermediate product into 1kg of water, uniformly stirring, adding 0.2kg of foaming agent T50 while stirring until the foaming agent is completely dissolved, and continuously stirring for 10min until the foaming agent is uniform to obtain the synergistic liquid.
Adding 2.1kg of fly ash, 4.0kg of anhydrous sodium sulphate, 0.7kg of sugar calcium, 0.35kg of glycerol, 0.55kg of sodium oxalate and 1.2kg of rice hull ash into a stirrer, uniformly stirring, then adding 0.2kg of synergistic liquid, mashing the massive solid formed by adding the synergistic liquid, uniformly stirring, then adding 0.9kg of sulphoaluminate cement, and uniformly stirring to obtain the cement grinding aid (D-3).
10kg of materials are mixed according to the proportion of 85 percent of clinker, 5 percent of gypsum and 10 percent of slag, and are ground for 20min to obtain cement C 1 (ii) a 10kg of materials are mixed according to the proportion of 85 percent of clinker, 5 percent of gypsum, 10 percent of slag and 0.5 percent of powder grinding aid sold in the market, and the mixture is ground for 20min to obtain cement C 2 (ii) a 10kg of materials are mixed according to the proportion of 85 percent of clinker, 5 percent of gypsum, 10 percent of slag and 0.5 percent of cement grinding aid (D-3) of the invention, and are ground for 20min to obtain cement C 3 (ii) a 10kg of materials are mixed according to the proportion of 85 percent of clinker, 5 percent of gypsum, 10 percent of furnace slag, 0.3 percent of cement grinding aid (D-3) of the invention and 0.2 percent of liquid grinding aid sold in the market, and the mixture is ground for 20min to obtain cement C 4 (ii) a 10kg of materials are mixed according to the proportion of 82 percent of clinker, 5 percent of gypsum, 13 percent of slag and 0.5 percent of cement grinding aid (D-3) of the invention, and the mixture is ground for 20min to obtain cement C 5 。
Example 4
The cement grinding aids (D-1, D-2 and D-3) obtained in examples 1 to 3 and commercially available powder grinding aids with 0.5% of the sample remained for 6 months, and a grinding test was performed;
10kg of materials are mixed according to the proportion of 85 percent of clinker, 5 percent of gypsum and 10 percent of coal gangue and ground for 20min to obtain cement E 1 (ii) a 10kg of materials are mixed according to the proportion of 85 percent of clinker, 5 percent of gypsum, 10 percent of coal gangue and 0.5 percent of powder grinding aid sold in the market, and the mixture is ground for 20min to obtain cement E 2 (ii) a 10kg of materials are mixed according to the proportion of 85 percent of clinker, 5 percent of gypsum, 10 percent of coal gangue and 0.5 percent of cement grinding aid (D-1) of the invention, and are ground for 20min to obtain cement E 3 (ii) a 10kg of materials are mixed according to the proportion of 85 percent of clinker, 5 percent of gypsum, 10 percent of coal gangue and 0.3 percent of cement grinding aid (D-2) of the invention, and are ground for 20min to obtain cement E 4 (ii) a 10kg of materials are mixed according to the proportion of 85 percent of clinker, 5 percent of gypsum, 10 percent of coal gangue and 0.5 percent of cement grinding aid (D-3) of the invention, and are ground for 20min to obtain cement E 5 。
According to GB/T26748-2011, the cement A of embodiments 1-4 is prepared 1 ～E 5 The physical properties were measured by GB/T17671, and the results are shown in tables 1 to 4.
TABLE 1 comparative test results for different cement formulations
As can be seen from Table 1, when the cement grinding aid (D-1) is used for preparing cement, the specific surface area of the cement is increased, the fineness is reduced, the breaking strength and the compressive strength are both obviously improved, and higher mechanical properties can be still obtained when clinker is reduced.
TABLE 2 comparative test results for different cement formulations
As can be seen from Table 2, compared with the powder grinding aid sold in the market, the cement prepared by using the cement grinding aid (D-2) provided by the invention has more excellent performance, the comprehensive performance of the cement cannot be greatly reduced even the clinker is reduced, and the cement grinding aid provided by the invention has good grinding effect.
TABLE 3 comparative test results for different cement formulations
As can be seen from Table 3, the specific surface area of the cement prepared by using the cement grinding aid (D-3) of the invention is obviously increased, the fineness of the cement is reduced, and the flexural strength and the compressive strength are increased and are superior to those of the grinding aid sold in the market; meanwhile, the addition of the cement grinding aid can reduce the clinker consumption and obtain high-performance cement; in addition, the cement grinding aid can be matched with a liquid grinding aid sold in the market for use, and the obtained cement has better comprehensive performance.
TABLE 4 comparative test results for different cement formulations
As can be seen from Table 4, the cement grinding aid (D-1, D-2 and D-3) prepared by leaving samples for 6 months has no reduction in physical properties such as flexural strength and compressive strength, but the commercially available powder grinding aid prepared by leaving samples for 6 months has obvious reduction in physical properties such as flexural strength and compressive strength, and the activity excitation effect of the commercially available powder grinding aid is poor.
According to the calculation of 350 yuan/ton of cement clinker, 60 yuan/ton of mixed material, 400 yuan/ton of cement and 1800 yuan/ton of powder cement grinding aid, the economic benefit of producing 1 ton of cement by using the cement grinding aid provided by the invention is as follows: the consumption of cement clinker is reduced by 3-5%, and the cost is reduced by 14 yuan according to 4%; the consumption of the mixed material is increased by 3 percent, and the cost is increased by 1.8 yuan; the cost of the cement grinding aid is 5.4 yuan; the cement consumption is reduced by 0.3 percent, and the cost is reduced by 1.2 yuan; the cost of 1 ton cement production is reduced by 8 yuan, and the annual economic benefit of an enterprise producing 100 ten thousand tons of cement can reach 800 ten thousand yuan.
The cement grinding aid provided by the invention has the advantages that the cement grinding aid has a good grinding aid effect, is excellent in chemical stability, can be stored for a long time, reduces waste in production and transportation links, is good in economic benefit, and has a prospect of large-scale industrial production.
Although the above embodiments have been described in detail, they are only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and all of the embodiments belong to the protection scope of the present invention.
Claims (10)
1. The cement grinding aid is characterized by comprising the following components in percentage by mass: 12 to 27 percent of fly ash, 4 to 12 percent of sulphoaluminate cement, 4 to 12 percent of calcium saccharate, 2 to 6 percent of glycerol, 8 to 17 percent of rice hull ash, 1.5 to 3.5 percent of synergistic liquid, 33 to 53 percent of anhydrous sodium sulphate and 4 to 12 percent of organic acid salt; the preparation raw materials of the synergistic liquid comprise the following components: diethanol monoisopropanolamine, an acid reagent, a foaming agent and water.
2. The cement grinding aid as claimed in claim 1, which comprises the following components in percentage by mass: 16-24% of fly ash, 6-10% of sulphoaluminate cement, 5-9% of calcium saccharate, 3-5% of glycerol, 9-15% of rice hull ash, 2-3% of synergistic liquid, 38-48% of anhydrous sodium sulphate and 5-11% of organic acid salt.
3. The cement grinding aid as claimed in claim 1, which is characterized by comprising the following components in percentage by mass: 16% of fly ash, 8% of sulphoaluminate cement, 8% of calcium saccharate, 4% of glycerol, 12% of rice hull ash, 3% of synergistic liquid, 39% of anhydrous sodium sulphate and 10% of organic acid salt.
4. The cement grinding aid according to claim 1, 2 or 3, wherein the salt of organic acid comprises one or more of calcium gluconate, sodium oxalate, calcium oxalate and calcium formate.
5. The cement grinding aid according to claim 1, 2 or 3, wherein the preparation method of the synergistic solution comprises the following steps: mixing diethanolisopropanolamine and an acid reagent for reaction to obtain an intermediate product; and mixing the intermediate product, a foaming agent and water to obtain the synergistic liquid.
6. The cement grinding aid according to claim 5, wherein the mass ratio of the diethanolisopropanolamine to the acid agent is 1.5-5: 1.
7. The cement grinding aid according to claim 5, wherein the mass ratio of the intermediate product to the foaming agent is 10-15: 1.
8. The cement grinding aid according to claim 5, wherein the temperature for mixing the diethanol monoisopropanolamine and the acid agent is 50-100 ℃ and the time is 10-15 min.
9. The cement grinding aid as claimed in claim 5, wherein the intermediate product, the foaming agent and the water are mixed for 10-50 min.
10. A method of preparing a cement grinding aid as claimed in any one of claims 1 to 9, comprising the steps of:
(1) mixing fly ash, anhydrous sodium sulphate, calcium saccharate, glycerol, organic acid salt and rice hull ash to obtain premix;
(2) mixing the premix and the synergistic solution to obtain a mixture;
(3) and mixing the mixture with sulphoaluminate cement to obtain the cement grinding aid.
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| CN116144324A (en) * | 2023-02-23 | 2023-05-23 | 湖南格林朗科技有限公司 | Synergistic liquid special for mineral separation and preparation method and application thereof |
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