CN112374785A - Method for preparing liquid accelerator by using sodium aluminate concentrate liquid of alumina plant - Google Patents
Method for preparing liquid accelerator by using sodium aluminate concentrate liquid of alumina plant Download PDFInfo
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- CN112374785A CN112374785A CN202011296612.1A CN202011296612A CN112374785A CN 112374785 A CN112374785 A CN 112374785A CN 202011296612 A CN202011296612 A CN 202011296612A CN 112374785 A CN112374785 A CN 112374785A
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- liquid
- sodium aluminate
- accelerator
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- aluminate concentrate
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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
- 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)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a method for preparing a liquid accelerator by using sodium aluminate concentrate liquid of an alumina plant, which comprises the following steps: and taking 60-72 parts by weight of sodium aluminate concentrate in the preparation process of the aluminum oxide. Under the condition of stirring, adding 13-20 parts by weight of aluminum hydroxide and 15-21 parts by weight of sodium hydroxide into the sodium aluminate fine solution, and stirring and reacting for 1-3 hours at the temperature of 110-120 ℃ in the reaction process; and after the reaction, continuously stirring and preserving heat for 1-2 hours to obtain the catalyst. The method reduces energy consumption and cost.
Description
Technical Field
The invention belongs to the technical field of concrete admixtures, and particularly relates to a liquid accelerator prepared from sodium aluminate concentrate of an alumina plant.
Background
Over the last decade, with the heavy investment construction of the iron highway base, the wet construction of sprayed concrete has gradually replaced the dry spraying construction, and the large use of the wet spraying of sprayed concrete not only improves the construction efficiency and reduces the manpower and cost investment, but also has great advantages in the aspects of environmental protection, safety, quality and the like; the liquid setting accelerator required by wet spraying of sprayed concrete is huge in demand, the consumption of the liquid setting accelerator in China per year can reach more than million tons according to incomplete statistics, and a large number of setting accelerator production enterprises are promoted by huge market demands. At present, most enterprises produce the liquid accelerator (alkali accelerator in GB/T35159-2017 accelerator for sprayed concrete) by a method that sodium hydroxide (flake alkali) and aluminum hydroxide are used as raw materials, and are heated to 110-115 ℃ in a reaction kettle according to a certain molar ratio and react for a certain time to prepare a transparent and uniform liquid product; however, in the production process, the raw materials need to be heated to 110-115 ℃ from a normal temperature state, a large amount of heat source energy consumption needs to be consumed in the process, and the energy consumption cost is huge. In addition, the liquid accelerator is prepared by taking solid caustic soda flakes and aluminum hydroxide as raw materials, and the raw materials are high in price, so that the production cost of the accelerator is high.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for preparing a liquid accelerator by using sodium aluminate concentrate in an alumina plant, aiming at the defects of the prior art, so that the energy consumption is reduced, and the cost is reduced.
In order to solve the technical problems, the invention adopts the technical scheme that the preparation method for preparing the liquid accelerator by using the sodium aluminate concentrate liquid of the alumina plant comprises the following steps:
and taking 60-72 parts by weight of sodium aluminate concentrate in the preparation process of the aluminum oxide.
Under the condition of stirring, adding 13-20 parts by weight of aluminum hydroxide and 15-21 parts by weight of sodium hydroxide into the sodium aluminate fine solution, and stirring and reacting for 1-3 hours at the temperature of 110-120 ℃ in the reaction process; and after the reaction, continuously stirring and preserving heat for 1-2 hours to obtain the catalyst.
Further, the temperature of the sodium aluminate fine solution is 110-120 ℃.
Furthermore, in the sodium aluminate concentrate liquid, the concentration of sodium hydroxide is 180-194 g/L, and the concentration content of aluminum hydroxide is 231-247 g/L.
Further, the sodium aluminate concentrate is obtained from an alumina plant, which is a liquid obtained by separating an aluminum ore after dissolving in an alkali sodium hydroxide.
Further, the purity of the sodium hydroxide was 99%.
Further, after adding the hydrogen hydroxide, adding 0.5-2 parts by weight of a modifier, wherein the modifier is one or a mixture of sodium silicate and sodium carbonate.
The invention also discloses a liquid accelerator, which is prepared by the preparation method for preparing the liquid accelerator by using the sodium aluminate concentrate liquid of the alumina plant.
The liquid accelerator is applied to sprayed concrete.
The application of the liquid accelerator in the sprayed concrete is that the dosage of the liquid accelerator is 4-6% of the mass of the cementing material in the concrete.
The invention has the following advantages: 1. the liquid accelerator is prepared by integrally utilizing the sodium aluminate fine liquid in the production process of the alumina, so that the link of decomposing the sodium aluminate into the aluminum hydroxide and the sodium hydroxide is reduced, the high-temperature heat of the sodium aluminate fine liquid is utilized, and the energy consumption is reduced. 2. The sodium aluminate concentrate is easy to obtain the raw materials at the upstream of the industrial chain, the price is low, and the cost of the liquid accelerator is reduced. 3. The method takes the sodium aluminate fine liquid of the alumina plant as the main raw material, and the alumina plant reduces the links of decomposing the part of the sodium aluminate fine liquid into the aluminum hydroxide and the sodium hydroxide and dehydrating and drying the aluminum hydroxide, thereby reducing the energy consumption.
Detailed Description
According to the invention, the sodium aluminate fine liquid is prepared by reacting sodium hydroxide and aluminum hydroxide and has a high-temperature condition, the sodium hydroxide and the aluminum hydroxide are added, the set molar ratio is reached under low energy consumption to obtain the liquid accelerator, and the high-temperature condition of the sodium aluminate fine liquid is comprehensively utilized due to the reduction of the link of decomposing the sodium aluminate fine liquid into the aluminum hydroxide and the sodium hydroxide and the link of dehydrating and drying the aluminum hydroxide, so that the energy consumption investment for producing the accelerator is reduced. The cost is reduced, and the produced liquid accelerator is reduced by 200-300 yuan per ton.
The invention discloses a preparation method for preparing a liquid accelerator by using sodium aluminate concentrate liquid of an alumina plant, which comprises the following steps:
taking 60-72 parts by weight of sodium aluminate concentrate in the preparation process of aluminum oxide;
under the condition of stirring, adding 13-20 parts by weight of aluminum hydroxide, then adding 15-21 parts by weight of sodium hydroxide, and finally adding 0.5-2 parts by weight of a modifier, and stirring and reacting for 1-3 hours, wherein the temperature is 110-120 ℃ in the reaction process; and after the reaction, continuously stirring and preserving heat for 1-2 hours to obtain the catalyst. The modifier is one or a mixture of sodium silicate and sodium carbonate. The temperature of the sodium aluminate fine liquid is 110-120 ℃.
The sodium hydroxide can be selected from Neimenggujunzheng, Neimenghua, Xinjiang, Ningxia Jinyi Yuan, and Xinjiang, with a content of 99% caustic soda flakes. The aluminum hydroxide is wet powder or dry powder aluminum hydroxide produced by aluminum industry and various alumina factories in China.
In the sodium aluminate concentrate, the concentration of sodium hydroxide is 180-194 g/L, and the concentration content of aluminum hydroxide is 231-247 g/L.
The sodium aluminate concentrate is obtained from an alumina plant and is a liquid obtained by separating aluminum ore after dissolving with sodium hydroxide. The refined liquid of sodium aluminate is a semi-finished product in the intermediate link of alumina plant production, and is obtained by filtering a crude liquid of sodium aluminate, which is produced by alkali dissolution of aluminum ore in the alumina plant and separation in a settling tank, by a leaf filter.
The invention also discloses a liquid accelerator, which is prepared by the preparation method for preparing the liquid accelerator by using the sodium aluminate concentrate liquid of the alumina plant.
The liquid accelerator is applied to sprayed concrete. Namely in the sprayed concrete of the primary support of railways, expressways, water conservancy and hydropower tunnels and slope protection. The dosage of the concrete cementing material is 4-6% of the mass of the cementing material in the concrete.
The specific embodiment is as follows:
example 1
Sodium aluminate concentrate liquid: 60g of the total weight of the mixture;
sodium hydroxide (flake base): 18g of a mixture;
aluminum hydroxide: 20g of the total weight of the mixture;
modifying agent: 2g, consisting of 1.5g sodium silicate and 0.5g sodium carbonate.
After the raw materials are weighed, the liquid accelerator prepared by using the sodium aluminate concentrate liquid of the alumina plant is prepared by adopting the method disclosed by the invention.
In order to verify the characteristics of the prepared liquid accelerator prepared by using the sodium aluminate concentrate liquid of the alumina plant, a cement paste test is carried out, and the concrete steps are as follows:
the selected cement varieties are as follows: tianrui PO42.5, Tongli PO42.5, Zhonglian PO42.5, Heishui PO42.5 and Huaxin PO 42.5.
The cement of the variety is selected one by one, the liquid setting accelerators in the embodiment are respectively added, 400g of the cement and 20g of the setting accelerators are respectively weighed, and the required water is 131.2g calculated according to the drying solid content of 56% of the setting accelerators. The mixing amount of the accelerator is 5 percent of the mass of the cement.
And (3) sequentially putting the cement and the water into the stirring pot, and starting the stirrer to stir for 30 seconds. Adding the weighed accelerating agent into a syringe at one time, stirring at a low speed for 5s, stirring at a high speed for 15s, immediately filling into a round die after stirring, inserting and smashing by a knife, slightly vibrating for a plurality of times, scraping redundant clear paste, and leveling the surface.
The concrete effects of the liquid accelerator prepared according to the proportion are shown in Table 1 according to the cement paste test of the liquid accelerator in GB/T35159-2017 accelerator for sprayed concrete.
TABLE 1 Cement paste test
| Varieties of cement | Initial setting time | Final setting time | 1d strength | 28d compressive Strength ratio |
| Tianrui PO42.5 | 2min30s | 6min50s | 13.5Mpa | 77％ |
| Same force PO42.5 | 3min40s | 8min10s | 12.1Mpa | 81％ |
| Middle-linked PO42.5 | 2min10s | 5min45s | 15.0Mpa | 75％ |
| Conch PO42.5 | 4min10s | 9min00s | 11.9Mpa | 83％ |
| Huaxin PO42.5 | 3min50s | 7min55s | 11.7Mpa | 86％ |
As can be seen from the data in Table 1, in 5 kinds of selected cement, the initial setting time is less than or equal to 5min, the final setting time is less than or equal to 12min, the 1d compressive strength is greater than or equal to 7MPa, the 28d compressive strength ratio is greater than or equal to 70%, and the technical requirements of GB/T35159-2017 accelerator for shotcrete are met.
Example 2
Sodium aluminate concentrate liquid: 72g of the total weight of the mixture;
sodium hydroxide (flake base): 15g of the total weight of the mixture;
aluminum hydroxide: 13g of a mixture;
modifying agent: 0 g.
After the raw materials are weighed, the liquid accelerator prepared by using the sodium aluminate concentrate liquid of the alumina plant is prepared by adopting the method disclosed by the invention.
In order to verify the characteristics of the prepared liquid accelerator prepared from the sodium aluminate concentrate of the alumina plant, a cement paste test was performed, which is the same as the verification method in example 1, and the specific effects are shown in table 2.
Table 2 neat cement paste test of example 2
| Varieties of cement | Initial setting time | Final setting time | 1d strength | 28d compressive Strength ratio |
| Tianrui PO42.5 | 2min50s | 7min20s | 13.2Mpa | 78％ |
| Same force PO42.5 | 3min55s | 8min30s | 12.6Mpa | 83％ |
| Middle-linked PO42.5 | 2min40s | 6min25s | 13.9Mpa | 77％ |
| Conch PO42.5 | 4min20s | 9min05s | 11.6Mpa | 81％ |
| Huaxin PO42.5 | 3min30s | 8min05s | 12.1Mpa | 80％ |
As can be seen from the data in Table 2, in 5 kinds of selected cement, the initial setting time is less than or equal to 5min, the final setting time is less than or equal to 12min, the 1d compressive strength is greater than or equal to 7MPa, the 28d compressive strength ratio is greater than or equal to 70%, and the technical requirements of GB/T35159-2017 accelerator for shotcrete are met.
Example 3
Sodium aluminate concentrate liquid: 70g of a mixture;
sodium hydroxide (flake base): 15g of the total weight of the mixture;
aluminum hydroxide: 14.5 g;
modifying agent: 0.5g, and the modifier is sodium carbonate.
After the raw materials are weighed, the liquid accelerator prepared by using the sodium aluminate concentrate liquid of the alumina plant is prepared by adopting the method disclosed by the invention.
In order to verify the characteristics of the prepared liquid accelerator using the sodium aluminate concentrate of the alumina plant, a cement paste test was performed, which was the same as the verification method of example 1, and the specific effects are shown in table 3.
Table 3 neat cement paste test of example 3
| Varieties of cement | Initial setting time | Final setting time | 1d strength | 28d compressive Strength ratio |
| Tianrui PO42.5 | 3min55s | 9min20s | 12.2Mpa | 89％ |
| Same force PO42.5 | 4min15s | 8min50s | 12.0Mpa | 85％ |
| Middle-linked PO42.5 | 4min40s | 7min45s | 13.0Mpa | 72％ |
| Conch PO42.5 | 4min40s | 9min15s | 11.2Mpa | 77％ |
| Huaxin PO42.5 | 4min20s | 8min45s | 11.8Mpa | 79％ |
As can be seen from the data in Table 3, in 5 kinds of selected cement, the initial setting time is less than or equal to 5min, the final setting time is less than or equal to 12min, the 1d compressive strength is greater than or equal to 7MPa, the 28d compressive strength ratio is greater than or equal to 70%, and the technical requirements of GB/T35159-2017 accelerator for shotcrete are met.
Example 4
Sodium aluminate concentrate liquid: 65g of the total weight of the mixture;
sodium hydroxide (flake base): 21g of a basic amine;
aluminum hydroxide: 14g of a mixture;
modifying agent: 0.5g, and the modifier is sodium silicate.
After the raw materials are weighed, the liquid accelerator prepared by using the sodium aluminate concentrate liquid of the alumina plant is prepared by adopting the method disclosed by the invention.
In order to verify the characteristics of the prepared liquid accelerator using the sodium aluminate concentrate of the alumina plant, a cement paste test was performed, which was the same as the verification method of example 1, and the specific effects are shown in table 4.
Table 4 cement paste test of example 4
| Varieties of cement | Initial setting time | Final setting time | 1d strength | 28d compressive Strength ratio |
| Tianrui PO42.5 | 3min45s | 8min50s | 13.2Mpa | 86％ |
| Same force PO42.5 | 4min05s | 8min40s | 12.4Mpa | 82％ |
| Middle-linked PO42.5 | 4min00s | 7min55s | 13.6Mpa | 76％ |
| Conch PO42.5 | 3min40s | 8min35s | 11.5Mpa | 79％ |
| Huaxin PO42.5 | 3min50s | 8min45s | 13.0Mpa | 81％ |
As can be seen from the data in Table 4, in 5 kinds of selected cement, the initial setting time is less than or equal to 5min, the final setting time is less than or equal to 12min, the 1d compressive strength is greater than or equal to 7MPa, the 28d compressive strength ratio is greater than or equal to 70%, and the technical requirements of GB/T35159-2017 accelerator for shotcrete are met.
Claims (9)
1. A preparation method for preparing a liquid accelerator by using sodium aluminate concentrate liquid in an alumina factory is characterized by comprising the following steps:
taking 60-72 parts by weight of sodium aluminate concentrate in the preparation process of aluminum oxide;
under the condition of stirring, adding 13-20 parts by weight of aluminum hydroxide and 15-21 parts by weight of sodium hydroxide into the sodium aluminate fine solution, and stirring and reacting for 1-3 hours at the temperature of 110-120 ℃ in the reaction process; and after the reaction, continuously stirring and preserving heat for 1-2 hours to obtain the catalyst.
2. The method for preparing the liquid accelerator by using the sodium aluminate concentrate liquid in the alumina plant as claimed in claim 1, wherein the temperature of the sodium aluminate concentrate liquid is 110-120 ℃.
3. The method for preparing the liquid accelerator by using the sodium aluminate concentrate liquid in the alumina plant as claimed in claim 2, wherein the concentration of sodium hydroxide in the sodium aluminate concentrate liquid is 180-194 g/L, and the concentration of aluminum hydroxide is 231-247 g/L.
4. The method for preparing the liquid accelerator by using the sodium aluminate concentrate of the alumina factory as claimed in claim 3, wherein the sodium aluminate concentrate is obtained from the alumina factory and is a liquid obtained by separating an aluminum ore after dissolving the aluminum ore in alkaline sodium hydroxide.
5. The method for preparing a liquid accelerator from sodium aluminate concentrate of an alumina plant according to claim 4, wherein the purity of the sodium hydroxide is 99%.
6. The method for preparing the liquid accelerator by using the sodium aluminate concentrate liquid in the alumina plant as claimed in any one of claims 1 to 5, wherein 0.5 to 2 parts by weight of a modifier is added after adding the hydroxide, wherein the modifier is one or a mixture of sodium silicate and sodium carbonate.
7. The liquid accelerator is characterized by being prepared by the method for preparing the liquid accelerator by using the sodium aluminate concentrate liquid of the alumina plant according to any one of claims 1 to 6.
8. The liquid accelerator according to claim 7, which is used in shotcrete.
9. The use of the liquid accelerator in shotcrete according to claim 8, wherein the amount is 4-6% by mass of the cementitious material in the concrete.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01294554A (en) * | 1988-05-23 | 1989-11-28 | Nippon Cement Co Ltd | Set accelerating agent for spraying concrete |
| CN1552925A (en) * | 2003-06-02 | 2004-12-08 | 上海添诚商务发展有限公司 | Processing method for industrial waste material |
| CN107445506A (en) * | 2017-08-14 | 2017-12-08 | 山西格瑞特建筑科技股份有限公司 | Utilize the method for aluminum bearing waste synthesis alkaline liquid accelerating agent |
-
2020
- 2020-11-18 CN CN202011296612.1A patent/CN112374785A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01294554A (en) * | 1988-05-23 | 1989-11-28 | Nippon Cement Co Ltd | Set accelerating agent for spraying concrete |
| CN1552925A (en) * | 2003-06-02 | 2004-12-08 | 上海添诚商务发展有限公司 | Processing method for industrial waste material |
| CN107445506A (en) * | 2017-08-14 | 2017-12-08 | 山西格瑞特建筑科技股份有限公司 | Utilize the method for aluminum bearing waste synthesis alkaline liquid accelerating agent |
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