CN110436866B - Bonding gypsum powder and preparation method thereof - Google Patents

Bonding gypsum powder and preparation method thereof Download PDF

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CN110436866B
CN110436866B CN201810419829.3A CN201810419829A CN110436866B CN 110436866 B CN110436866 B CN 110436866B CN 201810419829 A CN201810419829 A CN 201810419829A CN 110436866 B CN110436866 B CN 110436866B
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phosphogypsum
powder
retarder
parts
gypsum powder
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CN110436866A (en
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尹东杰
王莹
王鹏起
何亮
谭丹君
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Beijing New Building Material Group Co Ltd
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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
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
    • C04B28/143—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
    • 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The bonding gypsum powder comprises 100 parts by weight of phosphogypsum, 5-20 parts by weight of heavy calcium, 10-20 parts by weight of fly ash, 5-15 parts by weight of white cement, 1-5 parts by weight of retarder, 5-20 parts by weight of redispersed latex powder and 5-25 parts by weight of water-retaining agent. The method comprises the following steps: adjusting the pH value of the phosphogypsum to be neutral or alkalescent, calcining for a period of time, performing primary aging, grinding and sieving; adding a curing agent, uniformly stirring, and performing secondary aging to obtain the harmless pretreated phosphogypsum; uniformly mixing the phosphogypsum, the coarse whiting, the fly ash, the white cement, the retarder, the redispersible latex powder and the water-retaining agent which are subjected to harmless pretreatment to obtain the bonding gypsum powder. The application develops an effective mode for realizing the recycling of the phosphogypsum, and all the performances of the prepared bonding gypsum powder meet the national standard.

Description

Bonding gypsum powder and preparation method thereof
Technical Field
The application relates to but is not limited to the field of building materials, in particular to but not limited to a bonding gypsum powder and a preparation method thereof.
Background
The phosphogypsum is an industrial byproduct in the process of preparing phosphoric acid by a wet method, about 5 tons of phosphogypsum are generated when 1 ton of phosphoric acid is produced, and the accumulated storage amount of the phosphogypsum in China currently exceeds 3 hundred million tons. The annual cost for stacking phosphogypsum is up to millions yuan. Because the phosphogypsum contains harmful substances, a large amount of the phosphogypsum is discharged, so that the cost is increased, a large area of field is occupied for stacking, the environment is polluted, and the harm is brought to the human health and the ecological environment.
Therefore, there is a need for the development of a resource utilization approach for phosphogypsum.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The phosphogypsum contains impurities such as phosphorus, fluorine, organic matters and the like, and the comprehensive utilization of the phosphogypsum is influenced by the impurities. The application provides a method for performing harmless pretreatment on phosphogypsum and preparing bonding gypsum by using the phosphogypsum obtained by the pretreatment.
Specifically, the application provides a bonding gypsum powder, which comprises the following components in parts by weight:
Figure BDA0001650424660000011
Figure BDA0001650424660000021
in some embodiments, the phosphogypsum can be obtained by performing the following harmless pretreatment: adjusting the pH value of the phosphogypsum to be neutral or alkalescent, calcining for a period of time, performing primary aging, grinding and sieving; adding a curing agent, and performing secondary aging to obtain the harmless pretreated phosphogypsum.
In some embodiments, the weight ratio of screened phosphogypsum to the curing agent may be 100: 5-10.
In some embodiments, the pH of phosphogypsum can be adjusted to 6.5-8 with quicklime powder. Soluble P in quicklime powder CaO and phosphogypsum2O5、F-The reaction is carried out to generate inert substances, and the harm of soluble phosphorus and fluorine can be eliminated.
In some embodiments, the temperature of the calcination may be 150-.
In some embodiments, the time for the primary aging may be 24 to 72 hours, and the time for the secondary aging may be 24 hours.
In some embodiments, the sieving may be through an 80 mesh sieve, and the content of phosphogypsum that can pass through a 200 mesh sieve is not less than 30% in the phosphogypsum obtained after sieving.
In some embodiments, the curing agent may be selected from any one or more of fluorosilicate-based curing agents and amine-based curing agents.
In some embodiments, the fluorosilicate-based curing agent may be selected from any one or more of magnesium fluorosilicate, zinc fluorosilicate, calcium fluorosilicate, and sodium fluorosilicate.
In some embodiments, the amine-based curing agent may be selected from any one or more of 4, 4' -diaminodiphenylmethane, triethylene tetramine, diethylene triamine, N-methylol acrylamide, polypropylene aniline, m-phenylenediamine, and tetraethyl ammonium bromide.
When the curing agent is an amine curing agent, the bonding gypsum powder further comprises an accelerator. In some embodiments, the promoter may be selected from any one or more of salicylic acid, formaldehyde, benzaldehyde, methanol, ethanol, n-propanol, t-butanol, isobutanol, and cyclohexanol.
In some embodiments, the weight ratio of the amine-based curing agent to the accelerator may be 1:0.5 to 1.
In some embodiments, the triple superphosphate can be 200-500 mesh ultra white triple superphosphate powder.
In some embodiments, the strength rating of the white cement may be 32.5.
In some embodiments, the set retarder may be selected from any one or more of citric acid, sodium citrate, sodium hexametaphosphate, borax, and protein-based set retarders.
In some embodiments, the protein-based retarder may be selected from any one or more of a bone cement protein retarder and a protein-based gypsum retarder in which degraded polyamide is calcium-salted.
In some embodiments, the water retaining agent may be selected from any one or more of hydroxypropyl methylcellulose, carboxymethyl hydroxyethyl cellulose, hydroxypropyl cellulose, polyacrylamide, sodium polyacrylate, potassium polyacrylate, and ammonium polyacrylate.
In some embodiments, the hydroxypropyl methylcellulose may be a slow-dissolving hydroxypropyl methylcellulose having a viscosity grade of 40000-200000 pa.s.
In some embodiments, the hydroxypropyl methylcellulose may be a slow-dissolving hydroxypropyl methylcellulose having a viscosity grade of 60000-100000 pa.s.
The present application also provides a method of making a bonded landplaster, the method comprising the steps of:
adjusting the pH value of the phosphogypsum to be neutral or alkalescent, calcining for a period of time, performing primary aging, grinding and sieving; adding a curing agent, uniformly stirring, and performing secondary aging to obtain the harmless pretreated phosphogypsum;
uniformly mixing the phosphogypsum, the coarse whiting, the fly ash, the white cement, the retarder, the redispersible latex powder and the water-retaining agent which are subjected to harmless pretreatment to obtain the bonding gypsum powder.
In some embodiments, the pH of the phosphogypsum can be adjusted to 6.5-8 by quicklime powder, the phosphogypsum is calcined for 1.5-4 hours at the temperature of 150-200 ℃, aged for 24-72 hours, ground and sieved by a 80-mesh sieve, so that the content of the phosphogypsum which can pass through the 200-mesh sieve in the screened phosphogypsum is not lower than 30 percent; adding a curing agent, uniformly stirring, and continuously aging for 24 hours to obtain the phosphogypsum subjected to harmless pretreatment.
In some embodiments, the weight ratio of screened phosphogypsum to the curing agent may be 100: 5-10.
In some embodiments, the curing agent may be selected from any one or more of fluorosilicate-based curing agents and amine-based curing agents.
In some embodiments, the fluorosilicate-based curing agent may be selected from any one or more of magnesium fluorosilicate, zinc fluorosilicate, calcium fluorosilicate, and sodium fluorosilicate.
In some embodiments, the amine-based curing agent may be selected from any one or more of 4, 4' -diaminodiphenylmethane, triethylene tetramine, diethylene triamine, N-methylol acrylamide, polypropylene aniline, m-phenylenediamine, and tetraethyl ammonium bromide.
When the curing agent is an amine curing agent, the bonding gypsum powder further comprises an accelerator. In some embodiments, the promoter may be selected from any one or more of salicylic acid, formaldehyde, benzaldehyde, methanol, ethanol, n-propanol, t-butanol, isobutanol, and cyclohexanol.
In some embodiments, the weight ratio of the amine-based curing agent to the accelerator may be 1:0.5 to 1.
In some embodiments, the triple superphosphate can be 200-500 mesh ultra white triple superphosphate powder.
In some embodiments, the strength rating of the white cement may be 32.5.
In some embodiments, the set retarder may be selected from any one or more of citric acid, sodium citrate, sodium hexametaphosphate, borax, and protein-based set retarders.
In some embodiments, the protein-based retarder may be selected from any one or more of a bone cement protein retarder and a protein-based gypsum retarder in which degraded polyamide is calcium-salted.
In some embodiments, the water retaining agent may be selected from any one or more of hydroxypropyl methylcellulose, carboxymethyl hydroxyethyl cellulose, hydroxypropyl cellulose, polyacrylamide, sodium polyacrylate, potassium polyacrylate, and ammonium polyacrylate.
In some embodiments, the hydroxypropyl methylcellulose may be a slow-dissolving hydroxypropyl methylcellulose having a viscosity grade of 40000-200000 pa.s.
In some embodiments, the hydroxypropyl methylcellulose may be a slow-dissolving hydroxypropyl methylcellulose having a viscosity grade of 60000-100000 pa.s.
The application adopts the phosphogypsum to prepare the bonding gypsum powder, and realizes the reutilization of the phosphogypsum which is a solid waste. When the adopted phosphogypsum contains more harmful impurities, the phosphogypsum is neutralized, calcined and aged to remove part of the harmful impurities in the phosphogypsum, and then a curing agent is added, so that after the curing agent acts on the phosphogypsum, the damage and the damage of impurity ions to an electric double layer structure between gypsum particles can be effectively prevented, and the exchange activity of the impurity ions is limited. The chemical force generated by the curing agent can seal the diffusion path of impurity ions, so that the cohesive force of gypsum particles is enhanced, the phosphogypsum is cemented and cured in the process of coagulating and hardening in water and is not permeated and diffused out of the phosphogypsum any more, so that the phosphogypsum can reach the national standard of building gypsum, and the phosphogypsum can replace the traditional natural gypsum and desulfurized gypsum to produce bonding gypsum. Meanwhile, the fly ash is introduced into the bonding gypsum, so that the production cost is reduced, the comprehensive utilization of two solid wastes of industrial by-product phosphogypsum and fly ash is realized, the environment is protected, the energy is saved, and various mechanical properties of the prepared bonding gypsum meet the requirements.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof.
Detailed Description
Hereinafter, embodiments of the present application will be described in detail to make objects, technical solutions and advantages of the present application more apparent. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The phosphogypsum used in the following examples was produced by the chemical group of north Hucheng development, Inc.; the coarse whiting is 200-mesh 500-mesh ultra-white coarse whiting powder purchased from Yandong mineral products Co., Ltd, Tianjin; the fly ash is purchased from a Hengshi mineral processing plant in Lingshou county; the strength rating of the white cement was 32.5, purchased from Zhengzhou Konghui Corylist Ltd; the redispersible latex powder is purchased from Gomes chemical Co., Ltd, Shandong; the hydroxypropyl methylcellulose is slowly soluble hydroxypropyl methylcellulose with the viscosity grade of 60000-100000Pa.s and is purchased from Hebei Deli cellulose technology Limited company; the retarder is a protein gypsum retarder which is prepared by calcium salt formation of degraded polyamide produced by Shenhui gabbo retarder Co.Ltd in Quzhou county; other raw materials are all common commercial products.
Example 1
The phosphogypsum powder is prepared by phosphogypsum innocent treatment, and the method comprises the following specific steps:
step 1: the pH of phosphogypsum was adjusted to 7.2 with quicklime powder.
Step 2: and (2) calcining the phosphogypsum obtained in the step (1) in a muffle furnace at 170 ℃ for 2 hours, aging for 48 hours, grinding for 5 minutes, and sieving with a 80-mesh sieve, wherein the content of powder which can pass through the 200-mesh sieve is 35%.
And step 3: and (3) adding magnesium fluosilicate into the phosphogypsum powder obtained in the step (2), wherein the weight ratio of the phosphogypsum powder to the magnesium fluosilicate is 100:6, fully stirring, and continuously aging for 24 hours to obtain the harmless pretreated phosphogypsum powder.
Example 2
The phosphogypsum powder is prepared by phosphogypsum innocent treatment, and the method comprises the following specific steps:
step 1: the pH of phosphogypsum was adjusted to 6.8 with quicklime powder.
Step 2: and (2) calcining the phosphogypsum obtained in the step (1) in a muffle furnace at 160 ℃ for 2 hours, aging for 48 hours, grinding for 5 minutes, and sieving with a 80-mesh sieve, wherein the content of powder which can pass through the 200-mesh sieve is 32%.
And step 3: and (3) adding sodium fluosilicate into the phosphogypsum powder obtained in the step (2), wherein the weight ratio of the phosphogypsum powder to the sodium fluosilicate is 100:8, fully stirring, and continuously aging for 24 hours to obtain the phosphogypsum powder subjected to harmless treatment.
Example 3
The phosphogypsum powder is prepared by phosphogypsum innocent treatment, and the method comprises the following specific steps:
step 1: the pH of phosphogypsum was adjusted to 7.7 with quicklime powder.
Step 2: and (2) calcining the phosphogypsum obtained in the step (1) in a muffle furnace at 190 ℃ for 2 hours, aging for 48 hours, grinding for 5 minutes, and sieving with a 80-mesh sieve, wherein the content of powder which can pass through the 200-mesh sieve is 38%.
And step 3: and (3) adding N-hydroxymethyl acrylamide and salicylic acid into the phosphogypsum powder obtained in the step (2), wherein the weight ratio of the phosphogypsum powder to the N-hydroxymethyl acrylamide to the salicylic acid is 100:10:6, fully stirring, and continuously aging for 24 hours to obtain the phosphogypsum powder subjected to harmless treatment.
Comparative example 1
2.0 grade common building gypsum powder, purchased from the North New group building materials GmbH 28095The State division.
Comparative example 2
The untreated phosphogypsum powder is produced by chemical group of limited company of Hubei Xingsheng.
Test example 1
The phosphogypsum powder of the examples 1-3 and the comparative examples 1-2 is tested according to the Chinese national standard GB/T9776-2008 building Gypsum, the physical and mechanical properties of the phosphogypsum powder are detected, and the results are shown in Table 1.
TABLE 1 physical and mechanical Properties of phosphogypsum powder
Figure BDA0001650424660000071
As can be seen from Table 1, the phosphogypsum powder prepared by the innocent treatment process in the examples of the application has similar physical and mechanical properties with common 2.0-grade building gypsum.
Example 4
The bonded gypsum powder of example 4 was prepared using the innocuously pretreated phosphogypsum powder of example 1, with the following steps:
step 1: the raw material components are weighed according to the proportion, wherein the weight ratio of the harmless pretreated phosphogypsum powder, the heavy calcium carbonate, the fly ash, the white cement, the retarder, the redispersible emulsion powder and the hydroxypropyl methyl cellulose in the example 1 is 100:15:15:8:1.3:10: 15.
Step 2: and uniformly mixing the weighed components to obtain the bonding gypsum powder.
100 parts by weight of bonding gypsum powder and 55 parts by weight of water are mixed in a construction site, so that the non-toxic, harmless, green and environment-friendly bonding gypsum can be obtained.
Example 5
The bonded gypsum powder of example 5 was prepared using the innocuously pretreated phosphogypsum powder of example 1, with the following steps:
step 1: the raw material components are weighed according to the proportion, wherein the weight ratio of the harmless pretreated phosphogypsum powder, the heavy calcium carbonate, the fly ash, the white cement, the retarder, the redispersible emulsion powder and the hydroxypropyl methyl cellulose in the example 1 is 100:10:10:6:4:6: 10.
Step 2: and uniformly mixing the weighed components to obtain the bonding gypsum powder.
100 parts by weight of bonding gypsum powder and 60 parts by weight of water are mixed in a construction site, so that the non-toxic, harmless, green and environment-friendly bonding gypsum can be obtained.
Example 6
The bonded gypsum powder of example 6 was prepared using the innocuously pretreated phosphogypsum powder of example 1, with the following steps:
step 1: the raw material components are weighed according to the proportion, wherein the weight ratio of the harmless pretreated phosphogypsum powder, the heavy calcium carbonate, the fly ash, the white cement, the retarder, the redispersible emulsion powder and the hydroxypropyl methyl cellulose in the example 1 is 100:20:20:15:3.5:18: 20.
Step 2: and uniformly mixing the weighed components to obtain the bonding gypsum powder.
100 parts by weight of bonding gypsum powder and 67 parts by weight of water are mixed in a construction site, so that the non-toxic, harmless, green and environment-friendly bonding gypsum can be obtained.
Comparative example 3
A general type of commercially available bonding gypsum powder (purchased from jinan zhongjie chemical limited) is mixed with water according to the product use instructions to prepare bonding gypsum.
Test example 2
The physical and mechanical properties of the bonding gypsum are detected by testing examples 4-6 and comparative example 3 according to Chinese national standard JC/T1025-2007 bonding gypsum, and the results are shown in Table 2.
TABLE 2 physical and mechanical Properties of the binding Gypsum
Figure BDA0001650424660000081
Figure BDA0001650424660000091
As can be seen from Table 2, the bonding gypsum prepared in the examples of the present application can meet the physical and mechanical property standard requirements of building material industry standard requirements in terms of performance.
The performance index detection in the present application is based on national and industry standards. The bonding gypsum produced by the formula and the preparation process of the application meets or is higher than the requirements of the national standard of China.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.

Claims (19)

1. The bonding gypsum powder comprises the following components in parts by weight:
100 portions of phosphogypsum
5-20 parts of coarse whiting
10-20 parts of fly ash
5-15 parts of white cement
1-5 parts of retarder
5-20 parts of redispersible latex powder
5-25 parts of a water-retaining agent;
wherein the phosphogypsum is obtained by the following harmless pretreatment: adjusting the pH value of the phosphogypsum to 6.5-8 by using quicklime powder, calcining for a period of time, aging for one time, grinding and sieving; adding a curing agent, and performing secondary aging to obtain the harmless pretreated phosphogypsum; the weight ratio of the screened phosphogypsum to the curing agent is 100: 5-10;
the curing agent is any one or more of magnesium fluosilicate, sodium fluosilicate and N-hydroxymethyl acrylamide, and when the curing agent is the N-hydroxymethyl acrylamide, the bonding gypsum powder also comprises an accelerator.
2. The bonded landplaster of claim 1, wherein,
the calcining temperature is 150-200 ℃, and the time is 1.5-4 hours;
the time of the primary aging is 24-72 hours, and the time of the secondary aging is 24 hours;
the sieving is to sieve through a 80-mesh sieve, and in the screened phosphogypsum, the content of the phosphogypsum which can pass through a 200-mesh sieve is not less than 30%.
3. The cementitious gypsum powder of claim 1, wherein the accelerator is selected from any one or more of salicylic acid, formaldehyde, benzaldehyde, methanol, ethanol, n-propanol, t-butanol, isobutanol, and cyclohexanol.
4. The cementitious gypsum powder of any one of claims 1 to 3, wherein the weight ratio of the N-methylolacrylamide to the accelerator is 1: 0.5-1.
5. The cementitious gypsum powder of any one of claims 1 to 3, wherein the triple superphosphate is 200-500 mesh ultra white triple superphosphate powder.
6. The cementitious gypsum powder of any one of claims 1 to 3, wherein the white cement has a strength rating of 32.5.
7. The cementitious gypsum powder of any one of claims 1 to 3, wherein the set retarder is selected from any one or more of citric acid, sodium citrate, sodium hexametaphosphate, borax, and a protein-based set retarder; and wherein the protein retarder is selected from one or more of bone glue protein retarder and protein gypsum retarder formed by calcium salt of degraded polyamide.
8. The cohesive gypsum powder of any one of claims 1 to 3, wherein the water retaining agent is selected from any one or more of hydroxypropyl methylcellulose, carboxymethyl hydroxyethyl cellulose, hydroxypropyl cellulose, polyacrylamide, sodium polyacrylate, potassium polyacrylate, and ammonium polyacrylate.
9. The cementitious gypsum powder of claim 8, wherein the hydroxypropyl methylcellulose is a slow-dissolving hydroxypropyl methylcellulose having a viscosity grade of 40000-200000 pa.s.
10. The cementitious gypsum powder of claim 9, wherein the hydroxypropyl methylcellulose is a slow-dissolving hydroxypropyl methylcellulose having a viscosity grade of 60000-100000 pa.s.
11. A method of making a bonded landplaster, the method comprising the steps of:
adjusting the pH value of the phosphogypsum to 6.5-8 by using quicklime powder, calcining for a period of time, aging for one time, grinding and sieving; adding a curing agent, uniformly stirring, and performing secondary aging to obtain the harmless pretreated phosphogypsum;
uniformly mixing the phosphogypsum, the coarse whiting, the fly ash, the white cement, the retarder, the redispersible latex powder and the water-retaining agent which are subjected to harmless pretreatment to obtain bonding gypsum powder;
the curing agent is any one or more of magnesium fluosilicate, sodium fluosilicate and N-hydroxymethyl acrylamide, and when the curing agent is N-hydroxymethyl acrylamide, the bonding gypsum powder also comprises an accelerator; and is
Wherein, the pH value of the phosphogypsum is adjusted to 6.5-8 by quicklime powder, the phosphogypsum is calcined for 1.5-4 hours at the temperature of 150-200 ℃, aged for 24-72 hours, ground and sieved by a 80-mesh sieve, so that the content of the phosphogypsum which can pass through the 200-mesh sieve in the screened phosphogypsum is not lower than 30 percent; adding a curing agent, uniformly stirring, and continuously aging for 24 hours to obtain the harmless pretreated phosphogypsum; and is
Wherein the weight ratio of the screened phosphogypsum to the curing agent is 100: 5-10.
12. A process according to claim 11, wherein the promoter is selected from any one or more of salicylic acid, formaldehyde, benzaldehyde, methanol, ethanol, n-propanol, tert-butanol, isobutanol and cyclohexanol.
13. The process of claim 11 or 12, wherein the weight ratio of the N-methylolacrylamide to the accelerator is from 1:0.5 to 1.
14. The method as claimed in claim 11, wherein the heavy calcium is 200-500 mesh ultra-white heavy calcium powder.
15. The method of claim 11, wherein the strength rating of the white cement is 32.5.
16. The method of claim 11, wherein the retarder is selected from any one or more of citric acid, sodium citrate, sodium hexametaphosphate, borax, and protein-based retarders; and wherein the protein retarder is selected from one or more of bone glue protein retarder and protein gypsum retarder formed by calcium salt of degraded polyamide.
17. The method of claim 11, wherein the water retaining agent is selected from any one or more of hydroxypropyl methylcellulose, carboxymethyl hydroxyethyl cellulose, hydroxypropyl cellulose, polyacrylamide, sodium polyacrylate, potassium polyacrylate, and ammonium polyacrylate.
18. The method as claimed in claim 17, wherein the hydroxypropyl methylcellulose is a slow-dissolving hydroxypropyl methylcellulose having a viscosity grade of 40000-.
19. The method as claimed in claim 18, wherein the hydroxypropyl methylcellulose is a slow-dissolving hydroxypropyl methylcellulose having a viscosity grade of 60000-100000 pa.s.
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