CN109608078B - Semi-hydrated building gypsum coagulant, and preparation method and application thereof - Google Patents
Semi-hydrated building gypsum coagulant, and preparation method and application thereof Download PDFInfo
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- CN109608078B CN109608078B CN201910069892.3A CN201910069892A CN109608078B CN 109608078 B CN109608078 B CN 109608078B CN 201910069892 A CN201910069892 A CN 201910069892A CN 109608078 B CN109608078 B CN 109608078B
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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
- C04B40/0039—Premixtures of ingredients
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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
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a semi-hydrated building gypsum coagulant, a preparation method and application thereof, wherein the coagulant comprises mother liquor and powdery master batch, and the powdery master batch comprises soluble calcium salt; the mother liquor is sulfuric acid solution. The method adopts the matching use of soluble calcium salt and dilute sulfuric acid with certain concentration to improve the concentration of calcium ions and sulfate ions in the liquid phase of the semi-hydrated gypsum slurry, so that the semi-hydrated gypsum slurry quickly reaches the supersaturation degree of calcium sulfate dihydrate crystallization, finally a large amount of primary tiny calcium sulfate dihydrate crystal nuclei are formed in the solution of the semi-hydrated gypsum slurry, the obtained crystal nuclei are smaller in size and strong in induced crystallization, and the quick hardening of the semi-hydrated building gypsum is realized; the preparation process is simple, the using method is simple and easy to operate, technical support and theoretical guidance are provided for the hemihydrate gypsum coagulant with low cost and high coagulation accelerating effect, and the application prospect is good.
Description
Technical Field
The invention relates to the technical field of mineral processing, in particular to a semi-hydrated building gypsum coagulant and a preparation method and application thereof.
Background
The newly mined natural gypsum or industrial by-product gypsum comprises desulfurized gypsum, phosphogypsum, salt gypsum and the like, and the main components of the gypsum are semi-hydrated gypsum after the gypsum is modified by high-temperature calcination. Upon addition of water, a gypsum slurry is formed, while the hemihydrate gypsum combines with the water, reforming the dihydrate, and as the reaction proceeds, the gypsum slurry gradually loses fluidity and sets to harden. In order to meet the technological requirements of quick hardening and early strength of gypsum products in the production and manufacturing processes, the development of a novel coagulant which has good coagulation accelerating effect, low cost and convenient construction has important significance.
The mechanism of setting and hardening of the hemihydrate building gypsum mainly comprises a local chemical reaction theory and a dissolution crystallization theory, and the dissolution crystallization theory or the dissolution precipitation theory is widely acknowledged. This theory holds that after the semi-hydrated building gypsum is exposed to water, the semi-hydrated gypsum is first dissolved, and since the saturated solubility of the semi-hydrated gypsum is highly supersaturated for the dihydrate gypsum, crystal nuclei of the dihydrate gypsum spontaneously form and grow in the solution of the semi-hydrated gypsum, and it is because the crystals of the dihydrate gypsum are crossed and overlapped with each other to form a network structure, thereby setting and hardening macroscopically and giving mechanical strength. Based on the above mechanisms, in order to increase the rate of hydration hardening of hemihydrate gypsum, shorten setting time, and improve production continuity and efficiency, numerous scholars and researchers have developed a variety of accelerator products: for example, the invention patent of China with the publication number of CN103402944A discloses a calcined gypsum hydration promotion additive, the main component of the hydration promotion additive is ground calcium sulfate dihydrate, and is formed by adding bisulfate, sugar, starch and the like, mixing and grinding, the addition amount is about 0.1-0.5% of gypsum powder in the use process, and the hydration time is shortened from 10.5 minutes when the addition amount is zero to 6.0 minutes; the invention patent of China with publication number CN1341084A discloses a coagulant for gypsum hydration, and the main components of the hydration accelerating additive are ground and mixed by ground brushite, added sugar and starch, etc. The method comprises mixing ground brushite, semi-hydrated gypsum and water to form a gypsum slurry, the brushite serving as a seed crystal and rapidly initiating crystallization of the gypsum to accelerate the hydration rate of the gypsum; the coagulation accelerating principle of the method is that the ground dihydrate gypsum or brushite is added into the semi-hydrated gypsum slurry to play a role of adding seed crystals, namely, the extremely tiny dihydrate gypsum particles or brushite with defects in highly ground crystal lattices play a role of a crystal center in the semi-hydrated gypsum slurry, and the dihydrate gypsum or the brushite can quickly grow around the crystal center, so that the semi-hydrated gypsum slurry is quickly hydrated and coagulated to generate strength. However, in order to increase the content of the fine particles in the calcium sulfate dihydrate or brushite seed crystal to improve the coagulation promoting effect, longer ball milling time is usually required in the preparation process of the seed crystal to obtain larger specific surface area, but the ball milling energy consumption is increased, and meanwhile, part of crystal water of the dihydrate gypsum is lost to form hemihydrate gypsum due to overhigh local temperature in the ball milling process, so that the dihydrate gypsum loses the coagulation promoting effect due to the fact that the dihydrate gypsum cannot play the role of the seed crystal; in addition, the physical grinding process is limited by mechanical equipment, the particle size of the prepared dihydrate gypsum coagulant is usually in the micron level, the specific surface area is small, the active point position is few, and the coagulation accelerating effect of the prepared coagulant is inhibited. Meanwhile, when the finely ground dihydrate gypsum used as the coagulant is stored in air with high relative humidity or is contacted with water or is added into unsaturated calcium sulfate solution too early before use, the number of active sites on the ion surface of the dihydrate gypsum with small particle size is reduced, so that the coagulation accelerating effect of the dihydrate gypsum is reduced. In order to solve the above problems, it is often necessary to add additional additives (such as starch, sugar, etc.) to form a coating layer on the surface of the coagulant during the preparation of the calcium sulfate dihydrate to prevent the coagulant from contacting with water molecules in the air, thereby reducing the coagulation accelerating effect and increasing the preparation cost. Therefore, the gypsum coagulant has the advantages of low development cost, good coagulation accelerating effect, small influence of the product efficacy by the outside and simple and convenient operation, and has important significance.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a semi-hydrated building gypsum coagulant, and a preparation method and application thereof, and solves the problems that the existing gypsum coagulant is high in cost, complex to operate, poor in coagulation accelerating effect, volatile in effect and difficult to uniformly mix in semi-hydrated building gypsum in practical use.
In order to solve the technical problems, the invention adopts the following technical scheme: a semi-hydrated building gypsum set accelerator comprising a mother liquor and a powdered master batch, the powdered master batch comprising a soluble calcium salt; the mother solution is a sulfuric acid solution, and the preferable mass fraction of the sulfuric acid solution is 10-45%.
Like this, make the gypsum slurry aqueous phase of hemihydrate structure calcium ion and sulfate ion concentration increase rapidly along with the addition of soluble calcium salt and dilute sulfuric acid mother liquor, and then reach the supersaturation of calcium sulfate dihydrate fast, finally make it precipitate from the relatively fast crystallization in the solution and form a large amount of little crystal nuclei, around the little crystal nucleus calcium sulfate dihydrate that precipitates, the crystal grows up fast, and the crystal that precipitates simultaneously alternates the overlap joint and form network structure mutually, shows the attribute of rapid setting sclerosis on the macro. The soluble calcium salt master batch and the dilute sulfuric acid mother liquor synergistically promote the hydration hardening of the hemihydrate building gypsum and shorten the setting time of the hemihydrate building gypsum.
Preferably, the soluble calcium salt is one or more of calcium nitrate, calcium oxide, calcium chloride, calcium bicarbonate, calcium gluconate, calcium perchlorate and calcium bromide.
The preparation method of the semi-hydrated building gypsum coagulant comprises the following steps:
1) mixing soluble calcium salt and quartz sand, stirring, ball milling, and grinding to obtain powder with specific surface area not less than 400m2Obtaining master batch;
2) mixing concentrated sulfuric acid and water according to the mass ratio of 1-5: 10 to obtain mother liquor.
Therefore, the inert quartz sand and the soluble calcium salt are ground together, so that the silicon dioxide is loaded with the soluble calcium salt, and the dispersion uniformity of the soluble calcium salt in the semi-hydrated building gypsum can be effectively improved.
Preferably, the mass ratio of the soluble calcium salt to the quartz sand is 1:10 to 50.
Preferably, the stirring speed is 285 +/-10 rpm, and the stirring time is 2 min-5 min.
Preferably, the ball milling time is 10 min-30 min; the grinding time is 20-40 min.
The application of the semi-hydrated building gypsum coagulant comprises the following steps:
s1: mixing and premixing semi-hydrated building gypsum and powdery master batch according to the mass ratio of 10000: 1-5 to obtain a mixture;
s2: and (4) mixing the mother solution and the mixing water, uniformly stirring, adding the mixed solution into the mixture prepared in the step S1, and stirring to realize the setting and hardening of the semi-hydrated building gypsum.
Thus, the silicon dioxide loaded soluble calcium salt is added into the semi-hydrated building gypsum to be uniformly dispersed, the calcium ions dissolved out by the soluble calcium salt can be enabled under the synergistic cooperation of the dilute sulfuric acid mother liquor added with mixing water, the dissolved calcium ions and sulfate ions are integrated in the gypsum slurry to form calcium sulfate dihydrate micro crystal nuclei in situ, the newly formed calcium sulfate dihydrate crystal nuclei immediately participate in the hydration hardening process of the gypsum slurry, and compared with the method that the calcium sulfate dihydrate is ground in advance and then added into the gypsum slurry, a protective layer is not required to be coated on the surface of the calcium sulfate dihydrate crystal nuclei to protect active sites.
Preferably, the mass ratio of the mother liquor to the mixing water is 2-5: 40.
Preferably, the mass ratio of the mixture to the mixed solution is 10: 6-9.
Preferably, the premixing speed is 285 +/-10 rpm, and the time is 2-5 min.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts the matching use of soluble calcium salt and dilute sulphuric acid with certain concentration to improve the concentration of calcium ions and sulfate ions in the liquid phase of the semi-hydrated building gypsum slurry, further quickly achieve the supersaturation degree of calcium sulfate dihydrate crystallization, finally form a large amount of tiny calcium sulfate dihydrate crystal nuclei in situ in the solution of the semi-hydrated building gypsum slurry, quickly grow the crystals around the precipitated tiny crystal nuclei calcium sulfate dihydrate, simultaneously form a network structure by mutually inserting and lapping the precipitated crystals, and macroscopically show the property of quick setting and hardening. Compared with the added calcium sulfate dihydrate gypsum particles, the calcium sulfate dihydrate crystal nucleus has more quantity and smaller size, so that the calcium sulfate dihydrate crystal nucleus has more remarkable induced crystallization effect, and the rapid setting acceleration of the semi-hydrated building gypsum is realized.
2. The crystal nucleus of the calcium sulfate dihydrate is generated in situ in the gypsum slurry, and the newly formed crystal nucleus of the calcium sulfate dihydrate immediately participates in the hydration hardening process of the gypsum slurry, compared with the method that the calcium sulfate dihydrate is ground and then added into the gypsum slurry in advance, the method does not need to coat a protective layer on the surface of the crystal nucleus of the calcium sulfate dihydrate to protect active sites, has small influence on the product efficacy by the outside, does not have failure problem in the transportation and use process, does not need ball milling treatment because the formed crystal nucleus is finer, saves a large amount of ball milling energy consumption, does not need to add extra auxiliary agent for coating, has simple preparation process and high coagulation promoting efficiency. The raw materials are low in price and easy to obtain, the production cost is reduced, technical support and theoretical guidance are provided for the hemihydrate gypsum coagulant with low cost and high coagulation accelerating effect, and the application prospect is good.
3. The invention utilizes the matching use of the soluble calcium salt loaded by the inert quartz sand and the dilute sulphuric acid mother liquor with a certain concentration to carry out the coagulation promotion effect on the semi-hydrated building gypsum, the using method is simple and easy to operate, the quick coagulation promotion of the semi-hydrated gypsum can be realized by mixing and stirring, the initial coagulation time can be shortened to 2min47s, the coagulation promotion time is greatly saved, and the production efficiency of gypsum products is improved.
Detailed Description
The present invention will be described in further detail with reference to examples. In the following examples, the soluble calcium salts are all industrial grade or analytical pure reagents, wherein the content of active ingredients is more than or equal to 95 percent; the JJ-type cement mortar stirrer is a planetary stirring device which meets the requirements of GB3350, GB/T17671-1999, BS3892 and ISO679 standards; the clean quartz sand is SiO2Natural or artificial crushed siliceous sand with the content of more than or equal to 95 percent.
Example 1
1) Mixing calcium nitrate and clean quartz sand according to a mass ratio of 1: 20, compounding, and then premixing by adopting a JJ-type cement mortar stirrer, wherein the stirring speed is 285 +/-10 rpm, the premixing time is controlled to be 2-5 min, and after the premixing is finished, ball milling is carried out by adopting a ball mill to obtain fine powder, and the ball milling time is controlled to be 10 min; grinding the fine powder by using a ZM series double-cylinder vibration mill after the ball milling is finished, controlling the grinding time to be 20min, measuring the specific surface area of the ground sample by using a Boehringer specific surface area analyzer according to the method and the steps specified in GB8074-2008 'cement specific surface area measuring method Boehringer' after the grinding is finished, and controlling the specific surface area of the ground powder to be more than or equal to 400m2And/kg, obtaining the powdery master batch.
2) A water pump with a metering device is adopted to pump into an open polyethylene acid-resistant storage tank in a pumping mode to inject a certain amount of the polyethylene acid-resistant storage tankTap water of sanitary Standard for Drinking Water (GB 5749-2006); adding industrial sulfuric acid into the storage tank filled with tap water at a flow rate of 20ml/min by using a precision peristaltic pump, wherein the industrial sulfuric acid is H determined according to GB111982SO4Industrial acid with the content of more than or equal to 98 percent. And (3) rapidly stirring by using an electric stirrer in the process of adding the acid to ensure that the industrial sulfuric acid in the storage tank is in a uniform dilution state, controlling the mass ratio of the industrial sulfuric acid to tap water in the prepared solution to be 1:10, and stopping stirring when the temperature of the prepared solution is restored to the normal temperature to obtain the mother solution.
3) Taking 200g of building phosphogypsum meeting the requirements specified in GB/T9776-2008 building Gypsum as an experimental sample, adding 0.2g of powdery master batch prepared in the step 1), and premixing by using a JJ-type cement mortar mixer to obtain a mixed solution, wherein the stirring speed is 285 +/-10 rpm, and the premixing time is controlled to be 2-5 min.
4) Mixing 7.25g of the mother liquor prepared in the step 2) with 137.75g of water, and uniformly stirring by using a glass rod; the resulting mixture was added to the mixed solution prepared in step 3), and the setting time was examined according to the method for measuring the setting time specified in GB/T17669.4 "measurement of physical Properties of clean building Gypsum slurry".
Example 2
1) Calcium bicarbonate and calcium gluconate are mixed with clean quartz sand according to the mass ratio of 1: 30, compounding, and then premixing by adopting a JJ-type cement mortar stirrer, wherein the stirring speed is 285 +/-10 rpm, the premixing time is controlled to be 2-5 min, and after the premixing is finished, ball milling is carried out by adopting a ball mill to obtain fine powder, and the ball milling time is controlled to be 20 min; grinding the fine powder by using a ZM series double-cylinder vibration mill after the ball milling is finished, controlling the grinding time to be 30min, measuring the specific surface area of the ground sample by using a Boehringer specific surface area analyzer according to the method and the steps specified in GB8074-2008 'cement specific surface area measuring method Boehringer' after the grinding is finished, and controlling the specific surface area of the ground powder to be more than or equal to 400m2And/kg, obtaining the powdery master batch.
2) A water pump with a metering device is adopted to inject a certain amount of water into the open polyethylene acid-resistant storage tank in a pumping modeTap water in an amount meeting sanitary Standard for Drinking Water (GB 5749-2006); adding industrial sulfuric acid into the storage tank filled with tap water at a flow rate of 20ml/min by using a precision peristaltic pump, wherein the industrial sulfuric acid is H determined according to GB111982SO4Industrial acid with the content of more than or equal to 98 percent. And (3) rapidly stirring by using an electric stirrer in the process of adding the acid to ensure that the industrial sulfuric acid in the storage tank is in a uniform dilution state, controlling the mass ratio of the sulfuric acid to tap water in the prepared solution to be 3:10, and stopping stirring when the temperature of the prepared solution is restored to the normal temperature to obtain the mother liquor.
3) Taking 200g of building phosphogypsum meeting the requirements specified in GB/T9776-2008 building Gypsum as an experimental sample, adding 0.6g of powdery master batch prepared in the step 1), and premixing by using a JJ-type cement mortar mixer to obtain a mixed solution, wherein the stirring speed is 285 +/-10 rpm, and the premixing time is controlled to be 2-5 min.
4) Mixing 11.6g of the mother liquor prepared in the step 2) with 133.4g of gypsum slurry by stirring with water, and uniformly stirring by using a glass rod; then adding the mixture into the mixed solution prepared in the step 3).
Example 3
1) Calcium chloride and clean quartz sand are mixed according to the mass ratio of 1: 50, compounding, and then premixing by adopting a JJ-type cement mortar stirrer, wherein the stirring speed is 285 +/-10 rpm, the premixing time is controlled to be 2-5 min, and after the premixing is finished, ball milling is carried out by adopting a ball mill to obtain fine powder, and the ball milling time is controlled to be 30 min; grinding the fine powder by using a ZM series double-cylinder vibration mill after the ball milling is finished, controlling the grinding time to be 40min, measuring the specific surface area of the ground sample by using a Boehringer specific surface area analyzer according to the method and the steps specified in GB8074-2008 'cement specific surface area measuring method Boehringer' after the grinding is finished, and controlling the specific surface area of the ground powder to be more than or equal to 400m2And/kg, obtaining the powdery master batch.
2) A water pump with a metering device is adopted to pump a certain amount of tap water which meets the sanitary standard for drinking water (GB 5749-2006) into the open polyethylene acid-resistant storage tank; the assembly was fed at a flow rate of 20ml/min using a precision peristaltic pumpAdding industrial sulfuric acid into a storage tank of tap water, wherein the industrial sulfuric acid is H determined according to GB111982SO4Industrial acid with the content of more than or equal to 98 percent. And (3) rapidly stirring by using an electric stirrer in the process of adding the acid to ensure that the industrial sulfuric acid in the storage tank is in a uniform dilution state, controlling the mass ratio of the sulfuric acid to tap water in the prepared solution to be 5:10, and stopping stirring when the temperature of the prepared solution is restored to the normal temperature to obtain the mother liquor.
3) Taking 200g of building phosphogypsum meeting the requirements specified in GB/T9776-2008 building Gypsum as an experimental sample, adding 1g of powdery master batch prepared in the step 1), and premixing by adopting a JJ-type cement mortar mixer to obtain a mixed solution, wherein the mixing speed is 285 +/-10 rpm, and the premixing time is controlled to be 2-5 min.
4) Mixing 14.5g of the mother liquor prepared in the step 2) with 130.5g of gypsum slurry by stirring with water, and uniformly stirring by using a glass rod; the resulting mixture was added to the mixed solution prepared in step 3), and the setting time was examined according to the method for measuring the setting time specified in GB/T17669.4 "measurement of physical Properties of clean building Gypsum slurry".
Comparative example
The procedure is as in example 1, without addition of mother liquor and pulverulent masterbatch.
The setting times of examples 1 to 3 and comparative examples were examined according to the setting time measuring method specified in GB/T17669.4 "measurement of physical Properties of clean building Gypsum slurry", and the results are shown in Table 1.
TABLE 1
| Gypsum powder (g) | Mixing water (g) | Mother liquor (g) | Master batch (g) | Initial setting time | Final setting time | |
| Comparative example | 200 | 145 | 0 | 0 | 8 minutes and 48 seconds | 18 minutes and 39 seconds |
| Example 1 | 200 | 137.75 | 7.25 | 0.2 | 3 minutes and 56 seconds | 8 minutes 32 seconds |
| Example 2 | 200 | 133.4 | 11.6 | 0.6 | 3 minutes and 12 seconds | 7 minutes and 46 seconds |
| Example 3 | 200 | 130.5 | 14.5 | 1 | 2 minutes and 47 seconds | 7 minutes and 10 seconds |
As can be seen from Table 1, with the addition of the prepared mother liquor and the prepared master batch, the set accelerating time and the final set time of the hemihydrate gypsum are obviously shortened, and when the doping amount of the master batch is 1g and the doping amount of the mother liquor is 14.5g, the initial set time of the gypsum is shortened from 8 minutes to 48 seconds to 2 minutes to 47 seconds; the final setting time was shortened from 18 min 39 s to 7 min 10 s. Experiments prove that the synergistic effect of the master batch and the mother liquor prepared by the invention can obviously promote the hydration hardening rate of the semi-hydrated building gypsum and shorten the setting time, thereby improving the production efficiency of the semi-hydrated building gypsum product.
The above description is only exemplary of the present invention and should not be taken as limiting, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A semi-hydrated building gypsum set accelerator comprising a mother liquor and a powdered master batch, the powdered master batch comprising a soluble calcium salt; the mother liquor is a sulfuric acid solution;
the semi-hydrated building gypsum coagulant is prepared by the following method:
1) mixing soluble calcium salt and quartz sand, stirring, ball milling and grinding to specific surface area not less than 400m2Obtaining master batch; the mass ratio of the soluble calcium salt to the quartz sand is 1:10 to 50;
2) mixing concentrated sulfuric acid and water according to the mass ratio of 1-5: 10 to obtain mother liquor.
2. The semi-hydrated building gypsum accelerator of claim 1, wherein the soluble calcium salt is one or more of calcium nitrate, calcium oxide, calcium chloride, calcium bicarbonate, calcium gluconate, calcium perchlorate, and calcium bromide.
3. The semi-hydrated building gypsum accelerator of claim 1, wherein the stirring speed is 285 ± 10rpm and the stirring time is 2min to 5 min.
4. The semi-hydrated building gypsum accelerator of claim 1, wherein the ball milling time is 10 to 30 min; the grinding time is 20-40 min.
5. Use of a set accelerator for hemihydrate building gypsum as claimed in claim 1 or 2, comprising the steps of:
s1: mixing and premixing semi-hydrated building gypsum and powdery master batch according to the mass ratio of 10000: 1-5 to obtain a mixture;
s2: and (4) mixing the mother solution with the mixing water and uniformly stirring to obtain a mixed solution, and then adding the mixed solution into the mixture prepared in the step S1 and stirring to solidify and harden the semi-hydrated building gypsum.
6. The application of the semi-hydrated building gypsum accelerator as claimed in claim 5, wherein the mass ratio of the mother liquor to the water for mixing in the mixed solution is 2-5: 40.
7. The application of the hemihydrate building gypsum setting accelerator of claim 5, wherein the mass ratio of the mixture to the mixed solution is 10: 6-9.
8. The use of a hemihydrate building gypsum set accelerator according to claim 5, wherein the pre-mixing speed is 285 ± 10rpm and the time is 2-5 min.
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| CN105330198A (en) * | 2015-11-26 | 2016-02-17 | 广东龙湖科技股份有限公司 | Composition with water reduction function suitable for gypsum materials |
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