A slag composition, a slag material and a method for producing the same

Abstract

The present application relates to a kind of slag composition, slag material and its preparation method.The slag composition provided in the present application includes slag, carbide slag, sodium carbonate and admixture, and the admixture includes poly sodium epoxy succinate.The sodium carbonate-activated slag slurry prepared using the slag composition provided in the present application has high fluidity, and the hardened slurry has acceptable early compressive strength.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of solid waste resource utilization, and particularly relates to a slag composition, a slag material and a preparation method thereof. BACKGROUND

[0002] Compared with Portland cement, alkali-activated slag has the advantages of high early strength, good high-temperature resistance, acid and alkali corrosion resistance, etc. It is mainly composed of industrial waste granulated blast furnace slag, and has good economy and environmental protection. At present, the mainstream alkali-activated slag material uses sodium silicate and sodium hydroxide as an alkali activator to dissociate the granulated blast furnace slag and make it dissolve to generate a large number of active ions. However, sodium silicate and sodium hydroxide have the disadvantages of high cost, high corrosion, and high viscosity, and the production process generally accompanies a large amount of energy consumption and emission of pollution gas.

[0003] Compared with sodium silicate and sodium hydroxide, sodium carbonate can be directly extracted from natural soda, has a lower cost, and has a pH buffering capacity, which improves the safety of the operating personnel in the process of preparing alkali-activated slag. Therefore, using sodium carbonate as an alkali activator for granulated blast furnace slag has many advantages. However, the sodium carbonate-activated slag also has some problems, such as slow early strength development and poor fluidity. SUMMARY

[0004] In view of the above problems of the prior art, the present application provides a slag composition, a slag material and a preparation method thereof.

[0005] In a first aspect, the present application provides a slag composition, which comprises slag, carbide slag, sodium carbonate and an additive, wherein the additive comprises sodium polyepoxysuccinate.

[0006] The slag composition of the present application can significantly improve the disadvantages of sodium carbonate-activated slag, such as slow early strength development and poor fluidity, by using carbide slag powder and a specific additive. The slag composition of the present application can be used to prepare a high-fluidity sodium carbonate-activated slag slurry.

[0007] In some embodiments, the additive further comprises one or more of polymaleic anhydride, sodium tungstate and sodium phosphate.

[0008] In some embodiments, the additive is sodium polyepoxysuccinate.

[0009] In some embodiments, the additive is sodium polyepoxysuccinate and sodium tungstate.

[0010] In some embodiments, the additive is sodium polyepoxysuccinate, sodium tungstate and sodium phosphate.

[0011] In some embodiments, the admixture is sodium polyepoxy succinate, polymaleic anhydride, sodium tungstate, and sodium phosphate.

[0012] In some embodiments, the mass content of the admixture is 0.05%-0.6%, for example, 0.07%, 0.09%, 0.1%, 0.11%, 0.13%, 0.15%, 0.17%, 0.19%, 0.2%, 0.21%, 0.23%, 0.25%, 0.27%, 0.29%, 0.3%, 0.31%, 0.33%, 0.35%, 0.37%, 0.39%, 0.4%, 0.41%, 0.43%, 0.45%, 0.47%, 0.59%, 0.5%, 0.51%, 0.53%, 0.55%, 0.57%, 0.59%, or any value therebetween, based on the total mass of the slag and carbide slag. In some embodiments, the mass content of the admixture is 0.1%-0.5%. In some embodiments, the mass content of the admixture is 0.2%-0.4%.

[0013] In some embodiments, the mass content of the sodium polyepoxy succinate is 70%-100%, for example, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or any value therebetween, based on the mass of the admixture. In some embodiments, the mass content of the sodium polyepoxy succinate is 80%-100%.

[0014] In some embodiments, the mass content of sodium carbonate is 2%-12%, for example, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, or any value therebetween, based on the total mass of the slag and carbide slag. In some embodiments, the mass content of sodium carbonate is 4%-10%.

[0015] In some embodiments, the slag composition does not include other alkali activators other than sodium carbonate.

[0016] In some embodiments, the content of carbide slag is 1-10% by mass, for example 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5% or any value of mass thereof, based on the total mass of slag and carbide slag. In some embodiments, the content of carbide slag is 3-8% by mass.

[0017] In some embodiments, the specific surface area of the slag is greater than or equal to 400 m2 / kg, for example 400 m2 / kg-600 m2 / kg. In some embodiments, the specific surface area of the slag is 430 m2 / kg, 450 m2 / kg, 470 m2 / kg, 500 m2 / kg, 530 m2 / kg, 550 m2 / kg, 570 m2 / kg or 600 m2 / kg. 2 2 2 2 2 2 2 2 2 2

[0018] In some embodiments, the 28d activity index of the slag is greater than or equal to 95% (tested according to GB / T 18046-2017), for example 95%-110%. In some embodiments, the 28d activity index of the slag is 96%, 97%, 98%, 99%, 100%, 101%, 102%, 103%, 104%, 105%, 106%, 107%, 108% or 109%.

[0019] In some embodiments, the specific surface area of the carbide slag is greater than or equal to 300 m2 / kg, for example 300 m2 / kg-500 m2 / kg. In some embodiments, the specific surface area of the carbide slag is 330 m2 / kg, 350 m2 / kg, 370 m2 / kg, 400 m2 / kg, 430 m2 / kg, 450 m2 / kg, 470 m2 / kg or 500 m2 / kg. 2 2 2 2 2 2 2 2 2 2

[0020] ​​​​​​​​​​​​​​​​​​​​In some embodiments, the calcium hydroxide content of the carbide slag is greater than or equal to 70%, for example, 70%-90%. In some embodiments, the calcium hydroxide content of the carbide slag is 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, or 89%.

[0021] In a second aspect, the present application provides a slag material, comprising the slag composition of the first aspect and water.

[0022] In some embodiments, the mass ratio of water to slag composition (water to solid ratio) is 0.30-0.50, for example, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, or 0.49. In some embodiments, the mass ratio of water to slag composition is 0.40-0.45.

[0023] The slag material provided by the present application has a high flowability, and the hardened paste has an acceptable early compressive strength.

[0024] In a third aspect, the present application provides a method for preparing the slag material of the second aspect (delayed addition), comprising the following steps:

[0025] A1: mixing the admixture or the solution comprising the admixture with a part of the water to obtain an admixture mixture;

[0026] A2: mixing the sodium carbonate, the slag, and the carbide slag with the remaining part of the water for a first mixing time t1 to obtain a first mixture;

[0027] A3: placing the first mixture for a second time t2, and mixing the admixture mixture and the first mixture to obtain the slag material.

[0028] In some embodiments, in step A1, the part of the water is 10%-30% of the total mass of the water, for example, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, or any value therebetween.

[0029] In some embodiments, in step A2, the first mixing comprises a first low-speed mixing and a first high-speed mixing performed sequentially.

[0030] In some embodiments, the first low speed mixing has a rotational speed of 100 r / min to 200 r / min, for example 110 r / min, 130 r / min, 150 r / min, 170 r / min or 190 r / min.

[0031] In some embodiments, the first high speed mixing has a rotational speed of 250 r / min to 500 r / min, for example 270 r / min, 290 r / min, 300 r / min, 310 r / min, 330 r / min, 350 r / min, 370 r / min, 390 r / min, 400 r / min, 410 r / min, 430 r / min, 450 r / min, 470 r / min or 490 r / min.

[0032] In some embodiments, 0.06 < t2 / t1 < 15, for example t2 / t1 is 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5 or any value therebetween.

[0033] In some embodiments, 2 min < t2 < 10 min, for example t2 is 2 min, 2.5 min, 3 min, 3.5 min, 4 min, 4.5 min, 5 min, 5.5 min, 6 min, 6.5 min, 7 min, 7.5 min, 8 min, 8.5 min, 9 min, 9.5 min or any value therebetween.

[0034] In some embodiments, 0.5 min < t1 < 30 min, for example t1 is 1 min, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 13 min, 15 min, 17 min, 19 min, 20 min, 21 min, 23 min, 25 min, 27 min, 29 min or any value therebetween.

[0035] In some embodiments, the first low speed mixing has a rotational speed time of 1 min to 15 min, for example 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 13 min or any value therebetween.

[0036] In some embodiments, the first high-speed mixing has a rotation speed for 1 min to 15 min, for example, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 13 min, or any value therebetween.

[0037] In some embodiments, in step A3, the second mixing comprises sequentially performing a second low-speed mixing and a second high-speed mixing.

[0038] In some embodiments, the second low-speed mixing has a rotation speed of 100 r / min to 200 r / min, for example, 110 r / min, 130 r / min, 150 r / min, 170 r / min, or 190 r / min.

[0039] In some embodiments, the second high-speed mixing has a rotation speed of 250 r / min to 500 r / min, for example, 270 r / min, 290 r / min, 300 r / min, 310 r / min, 330 r / min, 350 r / min, 370 r / min, 390 r / min, 400 r / min, 410 r / min, 430 r / min, 450 r / min, 470 r / min, or 490 r / min.

[0040] In some embodiments, the second mixing has a time of 0.5 min to 10 min, for example, 1 min, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, or 9 min.

[0041] In some embodiments, the second low-speed mixing has a time of 0.5 min to 10 min, for example, 1 min, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, or 9 min.

[0042] In some embodiments, the second high-speed mixing has a time of 0.5 min to 10 min, for example, 1 min, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, or 9 min.

[0043] In some embodiments, the mass concentration of the admixture in the solution comprising the admixture is greater than or equal to 40%, for example, 40% to 50%. In some embodiments, the mass concentration of the admixture is 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, or 49%.

[0044] In some embodiments, the solution of the admixture is selected from a water solution of the admixture.

[0045] In some embodiments, the solution containing the admixture is a polyepoxysuccinic acid sodium solution with a concentration ≥ 40%. In some embodiments, the polyepoxysuccinic acid sodium solution has a density of 1.25-1.30 g / cm 3 In some embodiments, the polyepoxysuccinic acid sodium solution has a 1% solution pH value of 9.0-12.0.

[0046] In some embodiments, the solution containing the admixture is a polymaleic anhydride solution with a concentration ≥ 40%. In some embodiments, the polymaleic anhydride solution has a density of 1.19-1.22 g / cm 3 .

[0047] In some embodiments, the preparation method comprises the following specific steps:

[0048] The admixture or the admixture solution (e.g., a polyepoxysuccinic acid sodium solution, a polymaleic anhydride solution, sodium tungstate or sodium phosphate) is first mixed with 10%-30% water to obtain a standby solution. The powder (sodium carbonate, slag and carbide slag) is first stirred with the remaining 70%-90% water to obtain an initial slurry.

[0049] From the same time when the powder contacts water, after a time t min (2 < t < 10), the standby solution is added to the initial slurry obtained above, and stirring is continued to obtain a high-fluidity sodium carbonate-activated slag slurry.

[0050] In a fourth aspect, the present application provides a preparation method (instant addition) of the slag material of the second aspect, comprising the following steps:

[0051] B1: mixing the admixture or the solution containing the admixture with water to obtain an admixture mixture;

[0052] B2: third mixing the admixture mixture with sodium carbonate, slag and carbide slag to obtain the slag material.

[0053] In some embodiments, in step B2, the third mixing comprises third low-speed mixing and third high-speed mixing performed in sequence.

[0054] In some embodiments, the third low-speed mixing has a rotation speed of 100 r / min-200 r / min, for example, 110 r / min, 130 r / min, 150 r / min, 170 r / min or 190 r / min.

[0055] In some embodiments, the third high speed mixing is at a rotational speed of 250 r / min to 500 r / min, for example 270 r / min, 290 r / min, 300 r / min, 310 r / min, 330 r / min, 350 r / min, 370 r / min, 390 r / min, 400 r / min, 410 r / min, 430 r / min, 450 r / min, 470 r / min, or 490 r / min.

[0056] In some embodiments, the third mixing is for a time period of 0.5 min to 10 min, for example 1 min, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, or 9 min.

[0057] In some embodiments, the third low speed mixing is for a time period of 0.5 min to 10 min, for example 1 min, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, or 9 min.

[0058] In some embodiments, the third high speed mixing is for a time period of 0.5 min to 10 min, for example 1 min, 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, or 9 min.

[0059] In some embodiments, the mass concentration of the admixture in the solution comprising the admixture is greater than or equal to 40%, for example 40% to 50%. In some embodiments, the mass concentration of the admixture is 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, or 49%.

[0060] In some embodiments, the solution of the admixture is selected from the group consisting of aqueous solutions of the admixture.

[0061] In some embodiments, the solution comprising the admixture is a solution of sodium polyepoxy succinate with a concentration of > 40%. In some embodiments, the density of the solution of sodium polyepoxy succinate is 1.25 to 1.30 g / cm 3 In some embodiments, the pH of a 1% solution of the solution of sodium polyepoxy succinate is 9.0 to 12.0.

[0062] In some embodiments, the solution comprising the admixture is a solution of polymaleic anhydride with a concentration of > 40%. In some embodiments, the density of the solution of polymaleic anhydride is 1.19 to 1.22 g / cm 3 .

[0063] In some embodiments, the method of preparation comprises the following specific steps:

[0064] The admixture or admixture solution (for example, sodium polyepoxysuccinate solution, polymaleic anhydride solution, sodium tungstate or sodium phosphate) is directly added into the powder, and a high-fluidity sodium carbonate-activated slag slurry is obtained after stirring.

[0065] The sodium carbonate-activated slag slurry provided by the present application has high fluidity, and the hardened slurry has acceptable early compressive strength. BRIEF DESCRIPTION OF DRAWINGS

[0066] In order to more clearly illustrate the embodiments of the present application or the schemes in the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0067] Figure 1 The variation trend of the slurry fluidity of Examples 1-5 and Comparative Examples 1-2 with the admixture content is shown.

[0068] Figure 2 The variation trend of the slurry fluidity of Examples 6-10 and Comparative Examples 1-2 with the admixture content is shown. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in combination with the embodiments and drawings. The specific embodiments described herein are only used to explain the present application and do not constitute any limitation on the present application.

[0070] In the following examples and comparative examples, “%” means mass percentage unless otherwise specified.

[0071] In the following examples and comparative examples, the water-solid ratio refers to the mass ratio of water to the total amount of slag composition (the total mass of sodium carbonate, carbide slag powder, slag powder and admixture).

[0072] In the following examples and comparative examples, the specific surface area of the carbide slag powder is 350 m 2 / kg, and the effective calcium hydroxide content is 76%.

[0073] In the following examples and comparative examples, the specific surface area of the slag powder is 420 m 2 / kg, and the 28d activity index is 103%.

[0074] In the following examples and comparative examples, the concentration of the sodium polyepoxysuccinate solution (PESA solution) is 40%, and the manufacturer is Shandong Yousuo Chemical Technology Co., Ltd.

[0075] In the following examples and comparative examples, the concentration of polymaleic anhydride solution (HPMA solution) is 40%, and the supplier is Shandong Yousuo Chemical Technology Co., Ltd.

[0076] In the following examples and comparative examples, the flow diameter of the slurry is tested using a hollow truncated cone with a size of 36mm x 60mm x 60mm.

[0077] Specifically, after filling the hollow truncated cone with the obtained final slurry, the truncated cone is lifted vertically, and the slurry is allowed to flow freely on a smooth glass plate, and then the diameters in two perpendicular directions are measured, and the average value is taken as the flow diameter of the slurry. Before testing the flow degree of the slurry at 20min and 60min, the slurry is quickly stirred for 1min, and then the test is performed.

[0078] In the following examples and comparative examples, the stirring speed of the slow stirring is 140r / min, and the stirring speed of the fast stirring is 285r / min.

[0079] The present application is further illustrated in combination with specific examples and comparative examples.

[0080] Example 1

[0081] The water-solid ratio of the experiment is set to 0.45. 25.65g of sodium carbonate powder, 146.54g of water, 15g of carbide slag powder, 285g of slag powder, and 0.75g of PESA solution (PESA 0.3g) are weighed. The PESA is dissolved in 146.54g of water, and all the powders are mixed and stirred slowly for 2min, and then stirred quickly for 2min to obtain the final slurry.

[0082] The initial flow degree of the slurry is 135mm, the flow degree at 20min is 105mm, and the flow degree at 60min is 90mm.

[0083] Example 2

[0084] The water-solid ratio of the experiment is set to 0.45. 25.65g of sodium carbonate powder, 146.54g of water, 15g of carbide slag powder, 285g of slag powder, and 1.5g of PESA solution (PESA 0.6g) are weighed. The PESA is dissolved in 146.54g of water, and all the powders are mixed and stirred slowly for 2min, and then stirred quickly for 2min to obtain the final slurry.

[0085] The initial flow degree of the slurry is 144mm, the flow degree at 20min is 117mm, and the flow degree at 60min is 91.5mm.

[0086] Example 3

[0087] The water to solid ratio was set to 0.45. Weighed 25.65g of sodium carbonate powder, 146.54g of water, 285g of GGBS, 15g of carbide slag powder, 3g of PESA solution (PESA 1.2g). The PESA was dissolved in 146.54g of water and mixed with all the powders for 2min slow stirring and 2min fast stirring to get the final paste.

[0088] The initial fluidity of the paste was 155.5mm, the 20min fluidity was 179mm and the 60min fluidity was 105mm.

[0089] Example 4

[0090] The water to solid ratio was set to 0.45. Weighed 25.65g of sodium carbonate powder, 146.54g of water, 285g of GGBS, 15g of carbide slag powder, 3.75g of PESA solution (PESA 1.5g). The PESA was dissolved in 146.54g of water and mixed with all the powders for 2min slow stirring and 2min fast stirring to get the final paste.

[0091] The initial fluidity of the paste was 160mm, the 20min fluidity was 187mm and the 60min fluidity was 120mm (water and particles were separated in the paste).

[0092] Example 5

[0093] The water to solid ratio was set to 0.45. Weighed 25.65g of sodium carbonate powder, 146.54g of water, 285g of GGBS, 15g of carbide slag powder, 3.75g of PESA solution (PESA 1.5g). The PESA was dissolved in 146.54g of water and mixed with all the powders for 2min slow stirring and 2min fast stirring to get the final paste.

[0094] The initial fluidity of the paste was 160mm, the 20min fluidity was 187mm and the 60min fluidity was 120mm (water and particles were separated in the paste).

[0095] Example 6

[0096] The water to solid ratio was set to 0.45. Weighed 25.65g of sodium carbonate powder, 146.54g of water, 285g of GGBS, 15g of carbide slag powder, 0.75g of PESA solution (PESA 0.3g). The PESA was dissolved in 21.98g of water and set aside. 124.56g of water was mixed with all the powders for 1min slow stirring and 1min fast stirring to get the initial paste. Then waited for 3min (t=5min, 5-2(stirring time)=3min) and added the set aside solution to the initial paste for 1min slow stirring and 1min fast stirring to get the final paste.

[0097] The initial fluidity of the paste was 150 mm, the 20 min fluidity was 160 mm and the 60 min fluidity was 145 mm.

[0098] Example 7

[0099] The water to solid ratio for the experiment was set to 0.45. Weighed 25.65 g of sodium carbonate powder, 146.54 g of water, 285 g of GGBS, 15 g of carbide slag powder, 1.5 g of PESA solution (PESA 0.6 g). The PESA was dissolved in 21.98 g of water ready for use. 124.56 g of water was mixed with all the powders and stirred for 1 min slow and 1 min fast to obtain the initial paste. Then wait for 3 min (t = 5 min, 5 - 2 (stirring time) = 3 min) and add the ready for use solution to the initial paste, stir for 1 min slow and 1 min fast to obtain the final paste.

[0100] The initial fluidity of the paste was 165 mm, the 20 min fluidity was 190 mm and the 60 min fluidity was 180 mm.

[0101] Example 8

[0102] The water to solid ratio for the experiment was set to 0.45. Weighed 25.65 g of sodium carbonate powder, 146.54 g of water, 285 g of GGBS, 15 g of carbide slag powder, 2.25 g of PESA solution (PESA 0.9 g). The PESA was dissolved in 21.98 g of water ready for use. 124.56 g of water was mixed with all the powders and stirred for 1 min slow and 1 min fast to obtain the initial paste. Then wait for 3 min (t = 5 min, 5 - 2 (stirring time) = 3 min) and add the ready for use solution to the initial paste, stir for 1 min slow and 1 min fast to obtain the final paste.

[0103] The initial fluidity of the paste was 175 mm, the 20 min fluidity was 200 mm and the 60 min fluidity was 205 mm.

[0104] Example 9

[0105] The water to solid ratio for the experiment was set to 0.45. Weighed 25.65 g of sodium carbonate powder, 146.54 g of water, 285 g of GGBS, 15 g of carbide slag powder, 3 g of PESA solution (PESA 1.2 g). The PESA was dissolved in 21.98 g of water ready for use. 124.56 g of water was mixed with all the powders and stirred for 1 min slow and 1 min fast to obtain the initial paste. Then wait for 3 min (t = 5 min, 5 - 2 (stirring time) = 3 min) and add the ready for use solution to the initial paste, stir for 1 min slow and 1 min fast to obtain the final paste.

[0106] The initial fluidity of the paste was 200 mm, the 20 min fluidity was 200 mm, and the 60 min fluidity was 205 mm (exudation occurred, with water and particles separating in the paste).

[0107] Example 10

[0108] The water to solid ratio was set to 0.45. 25.65 g of sodium carbonate powder, 146.54 g of water, 285 g of GGBS, 15 g of carbide slag powder, 3.75 g of PESA solution (PESA 1.5 g) were weighed. The PESA was dissolved in 21.98 g of water ready for use. 124.56 g of water was mixed with all the powders and stirred slowly for 1 min and then fast for 1 min to give an initial paste. The ready for use solution was then added to the initial paste and stirred slowly for 1 min and then fast for 1 min to give the final paste.

[0109] The initial fluidity of the paste was 208 mm, the 20 min fluidity was 204 mm, and the 60 min fluidity was 205 mm (exudation occurred, with water and particles separating in the paste).

[0110] Example 11

[0111] The water to solid ratio was set to 0.45. 25.65 g of sodium carbonate powder, 146.54 g of water, 285 g of GGBS, 15 g of carbide slag powder, 1.3 g of PESA solution (PESA 0.52 g), 0.08 g of sodium tungstate powder were weighed. The PESA and sodium tungstate powder were dissolved in 21.98 g of water ready for use. 124.56 g of water was mixed with all the powders and stirred slowly for 1 min and then fast for 1 min to give an initial paste. The ready for use solution was then added to the initial paste and stirred slowly for 1 min and then fast for 1 min to give the final paste.

[0112] The initial fluidity of the paste was 170 mm, the 20 min fluidity was 180 mm, and the 60 min fluidity was 185 mm.

[0113] Example 12

[0114] An experiment water to solid ratio of 0.45 was set. 25.65g of sodium carbonate powder, 146.54g of water, 285g of GGBFS, 15g of carbide slag powder, 1.3g of PESA solution (0.52g of PESA), 0.06g of sodium tungstate powder, 0.02g of sodium phosphate powder were weighed. The PESA, sodium tungstate and sodium phosphate powder were dissolved in 21.98g of water ready for use. 124.56g of water was mixed with all the other powders and stirred for 1 min slow then 1 min fast to give an initial slurry. The ready for use solution was then added to the initial slurry and stirred for 1 min slow then 1 min fast to give the final slurry.

[0115] The initial fluidity of the slurry was 174mm, the 20min fluidity was 179mm and the 60min fluidity was 175mm.

[0116] Example 13

[0117] An experiment water to solid ratio of 0.42 was set. 25.65g of sodium carbonate powder, 146.54g of water, 285g of GGBFS, 15g of carbide slag powder, 1.3g of PESA solution (0.52g of PESA), 0.1g of HPMA solution (0.04g of HPMA), 0.04g of sodium tungstate powder were weighed. The PESA, HPMA, sodium tungstate powder were dissolved in 21.98g of water ready for use. 124.56g of water was mixed with all the other powders and stirred for 1 min slow then 1 min fast to give an initial slurry. The ready for use solution was then added to the initial slurry and stirred for 1 min slow then 1 min fast to give the final slurry.

[0118] The initial fluidity of the slurry was 180mm, the 20min fluidity was 180mm and the 60min fluidity was 175mm.

[0119] Example 14

[0120] An experiment water to solid ratio of 0.42 was set. 25.65g of sodium carbonate powder, 136.77g of water, 285g of GGBS, 15g of carbide slag powder, 1.95g of PESA solution (PESA 0.78g), 0.09g of sodium tungstate powder, 0.03g of sodium phosphate powder were weighed. The PESA was dissolved in 20.52g of water ready for use. 116.25g of water was mixed with all other powders and stirred for 1 min slow then 1 min fast to give an initial slurry. The slurry was then left to stand for 3 min (t=5min, 5-2(stir time)=3min) and the ready for use solution was added to the initial slurry which was stirred for 1 min slow then 1 min fast to give the final slurry.

[0121] The initial fluidity of the slurry was 180mm, the 20min fluidity was 185mm and the 60min fluidity was 185mm.

[0122] Example 15

[0123] An experiment water to solid ratio of 0.42 was set. 25.65g of sodium carbonate powder, 136.77g of water, 285g of GGBS, 15g of carbide slag powder, 1.95g of PESA solution (PESA 0.78g), 0.09g of sodium tungstate powder, 0.03g of sodium phosphate powder were weighed. The PESA was dissolved in 20.52g of water ready for use. 116.25g of water was mixed with all other powders and stirred for 1 min slow then 1 min fast to give an initial slurry. The slurry was then left to stand for 3 min (t=5min, 5-2(stir time)=3min) and the ready for use solution was added to the initial slurry which was stirred for 1 min slow then 1 min fast to give the final slurry.

[0124] The initial fluidity of the slurry was 180mm, the 20min fluidity was 185mm and the 60min fluidity was 185mm.

[0125] Example 16

[0126] An experiment water to solid ratio of 0.42 was set. 25.65g of sodium carbonate powder, 136.77g of water, 285g of GGBS, 15g of carbide slag powder, 1.95g of PESA solution (PESA 0.78g), 0.09g of sodium tungstate powder, 0.03g of sodium phosphate powder were weighed. The PESA was dissolved in 20.52g of water ready for use. 116.25g of water was mixed with all other powders and stirred for 1 min slow then 1 min fast to give an initial slurry. The slurry was then left to stand for 3 min (t=5min, 5-2(stir time)=3min) and the ready for use solution was added to the initial slurry which was stirred for 1 min slow then 1 min fast to give the final slurry.

[0127] The initial fluidity of the slurry is 184 mm, the fluidity after 20 minutes is 188 mm, and the fluidity after 60 minutes is 180 mm.

[0128] Comparative Example 1

[0129] Set the experimental water-to-solid ratio to 0.45. Weigh 25.65g of sodium carbonate powder, 146.54g of water, and 300g of slag powder. Combine all powders with 146.54g of water and stir slowly for 2 minutes, then rapidly for 2 minutes to obtain the final slurry.

[0130] The initial fluidity of the slurry is 120 mm, the fluidity after 20 minutes is 105 mm, and the fluidity after 60 minutes is 80 mm.

[0131] Comparative Example 2

[0132] Set the experimental water-to-solid ratio to 0.45. Weigh 25.65g of sodium carbonate powder, 146.54g of water, 15g of carbide slag powder, and 285g of slag powder. Combine all powders with 146.54g of water and stir slowly for 2 minutes, then rapidly for 2 minutes to obtain the final slurry.

[0133] The initial fluidity of the slurry is 110 mm, the fluidity after 20 minutes is 98 mm, and the fluidity after 60 minutes is 80 mm.

[0134] The test results of the raw material amounts and slurry fluidity of the above embodiments and comparative examples are shown in Table 1 and Figure 1-2 .

[0135] Table 1

[0136]

[0137] Note: Examples 1-5 adopt the method of immediate addition to add the admixture, while Examples 6-16 adopt the method of delayed addition to add the admixture.

[0138] From Table 1 and Figure 1-2 It can be seen from the data that: compared with the comparative example, the sodium carbonate activated slag slurry prepared in the present application has higher fluidity.

[0139] In addition to the improved flow properties, taking some examples as examples, the variation trend of immediate addition (direct addition) and delayed addition with the admixture dosage conforms to the equation provided in the table below. The specific equation parameters are shown in Table 2 below. Compared with the comparative examples, the fluidity of the examples is significantly improved.

[0140] Table 2

[0141]

[0142] The technical solutions of the present application are not limited to the above specific embodiments, and any technical variations made according to the technical solutions of the present application fall within the protection scope of the present application.

Claims

1. A slag material comprising a slag composition and water, wherein the slag composition comprises slag, carbide slag, sodium carbonate and an admixture, wherein the admixture comprises sodium polyepoxysuccinate; Based on the total mass of slag and carbide slag, the mass content of the admixture is 0.15%-0.35%; The preparation method of the slag material comprises the following steps: A1: mixing an admixture or a solution containing an admixture with a portion of water to obtain an admixture mixed solution; A2: mixing the sodium carbonate, slag, and carbide slag with the remaining water for a first time t1 to obtain a first mixed solution; A3: After the first mixed liquid is allowed to stand for a second time t2, the admixture mixed liquid and the first mixed liquid are mixed for a second time to obtain the slag material; 0.06≤t2 / t1≤15.

2. The slag material according to claim 1, characterized in that The additive further comprises one or more of polymaleic anhydride, sodium tungstate and sodium phosphate.

3. The slag material according to claim 1, characterized in that The additive is sodium polyepoxysuccinate.

4. The slag material according to claim 1, characterized in that The additives are sodium polyepoxysuccinate and sodium tungstate.

5. The slag material according to claim 1, characterized in that The additives are sodium polyepoxysuccinate, sodium tungstate and sodium phosphate.

6. The slag material according to claim 1, characterized in that The additives are sodium polyepoxysuccinate, polymaleic anhydride, sodium tungstate and sodium phosphate.

7. The slag material according to any one of claims 1 to 6, characterized in that Based on the total mass of slag and carbide slag, the mass content of the admixture is 0.2%-0.3%; and / or Based on the mass of the admixture, the mass content of the sodium polyepoxysuccinate is 70%-100%.

8. The slag material according to claim 7, characterized in that Based on the mass of the admixture, the mass content of the sodium polyepoxysuccinate is 80%-100%.

9. The slag material according to any one of claims 1 to 6, characterized in that The mass content of sodium carbonate is 2% to 12% based on the total mass of slag and carbide slag; and / or Based on the total mass of slag and carbide slag, the mass content of carbide slag is 1%-10%.

10. The slag material according to claim 9, characterized in that The mass content of sodium carbonate is 4%-10%; and / or the mass content of calcium carbide slag is 3%-8%.

11. The slag material according to any one of claims 1 to 6, characterized in that The specific surface area of ​​the slag is greater than or equal to 400 m 2 / kg, the 28d activity index of the slag is greater than or equal to 95%; and / or The specific surface area of ​​the carbide slag is greater than or equal to 300 m 2 / kg, the effective calcium hydroxide content in the carbide slag is greater than or equal to 70%.

12. The slag material according to claim 11, characterized in that The specific surface area of ​​the slag is 400 m 2 / kg-600 m 2 / kg, the 28d activity index of the slag is 95%-110%; and / or; The specific surface area of ​​the carbide slag is 300 m 2 / kg-500 m 2 / kg, the effective calcium hydroxide content in the carbide slag is 70%-90%.

13. The slag material according to any one of claims 1 to 6, characterized in that The mass ratio of water to slag composition is 0.30-0.

50.

14. The slag material according to claim 13, wherein The mass ratio of water to slag composition is 0.40-0.

45.

15. The slag material according to any one of claims 1 to 6, characterized in that In step A1, the portion of water is 10%-30% of the total mass of water; and / or In step A2, the first mixing includes sequentially performing first low-speed mixing and first high-speed mixing; and / or 2min≤t2≤10min, 0.5min≤t1≤30min; In step A3, the second mixing includes a second low-speed mixing and a second high-speed mixing performed sequentially.

16. The slag material according to claim 15, characterized in that In step A2, the rotation speed of the first low-speed mixing is 100 r / min-200 r / min, and the rotation speed of the first high-speed mixing is 250 r / min-500 r / min; In step A3, the rotation speed of the second low-speed mixing is 100 r / min-200 r / min, and the rotation speed of the second high-speed mixing is 250 r / min-500 r / min.

17. The slag material according to any one of claims 1 to 6, characterized in that The mass concentration of the admixture in the solution containing the admixture is greater than or equal to 40%; and / or The solution of the admixture is selected from aqueous solutions of admixtures.

18. The slag material according to claim 17, characterized in that The mass concentration of the admixture in the solution containing the admixture is 40%-50%.

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