A concrete based on iron mine tailings and a method for its production

Abstract

The application relates to a concrete based on iron mine tailings and a preparation method thereof, and belongs to the technical field of iron mine tailings application. The preparation raw materials of the concrete include iron mine tailings, river sand, Portland cement, tap water, a binding liquid and a water reducing agent. The preparation raw materials of the binding liquid are as follows: 20-30 parts of a polyacrylamide solution, 3-6 parts of magnesium oxide powder, 5-10 parts of resin, 20-25 parts of polypropylene fiber, 10-18 parts of an antioxidant and 5-12 parts of cellulose acetate butyrate powder; and the preparation raw materials of the water reducing agent are as follows: 6-10 parts of montmorillonite powder, 10-15 parts of iron oxide powder and 3-8 parts of corn starch. The existing addition of iron mine tailings in concrete can cause the compressive strength and the flexural strength to decrease. In the application, the iron mine tailings, the polyacrylamide solution, the magnesium oxide powder and the cellulose acetate butyrate powder are mutually synergistic, the influence of the iron mine tailings on the compressive strength and the flexural strength of the concrete is reduced, the content of the iron mine tailings in the concrete is increased, and the consumption of the iron mine tailings is increased.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of iron ore tailings application, and particularly relates to concrete based on iron ore tailings and a preparation method thereof. BACKGROUND

[0002] Iron ore tailings refer to waste residues left after iron ore is beneficiated, and contain beneficial components and harmful components in the iron ore. Due to mining of the ore, a large amount of iron ore tailings is accumulated, which pollutes the environment if stored for a long time, and is usually used to prepare concrete.

[0003] However, when the concrete is configured, the proportion of the iron ore tailings added is inversely proportional to the strength of the concrete, that is, the higher the proportion of the iron ore tailings added in the concrete, the lower the strength of the concrete, and therefore, in order to increase the strength of the concrete, the addition of the iron ore tailings needs to be reduced, which causes a large amount of the iron ore tailings to be difficult to consume. SUMMARY

[0004] The application aims to provide concrete based on iron ore tailings and a preparation method thereof to solve the above problems.

[0005] The application achieves the above-mentioned purpose by the following technical scheme:

[0006] The application provides concrete based on iron ore tailings, which comprises iron ore tailings, river sand, Portland cement, tap water, a binding liquid and a water reducing agent.

[0007] The binding liquid is prepared from 20-30 parts of polyacrylamide solution, 3-6 parts of magnesium oxide powder, 5-10 parts of resin, 20-25 parts of polypropylene fiber, 10-18 parts of antioxidant and 5-12 parts of cellulose acetate butyrate powder by weight.

[0008] As a further optimization scheme of the application, the concrete is prepared from 20-35 parts of iron ore tailings, 10-15 parts of river sand, 35-45 parts of Portland cement, 60-80 parts of tap water, 5-10 parts of the binding liquid and 8-15 parts of the water reducing agent by weight.

[0009] As a further optimization scheme of the application, the polyacrylamide solution is prepared by placing polyacrylamide colloid in a container and stirring for 30-45 min, adding pure water during the stirring process and mixing, and obtaining the polyacrylamide solution after sufficient mixing, and the stirring speed is 60 rpm.

[0010] As a further optimization scheme of the application, the mass ratio of the polyacrylamide colloid to pure water is 1:5.

[0011] As a further optimization scheme of the present application, the preparation process of the resin is that the furfuryl alcohol resin and the rosin are heated and fused to obtain the resin; and the preparation process of the antioxidant is that the palmitic acid, the magnesium stearate and the glycerol are mixed, then the distilled water is added, and heated to 80-120 DEG C to obtain the antioxidant.

[0012] As a further optimization scheme of the present application, the preparation raw materials of the resin are 30-45 parts of the furfuryl alcohol resin and 10-20 parts of the rosin by weight; and the preparation raw materials of the antioxidant are 20-35 parts of the palmitic acid, 6-10 parts of the magnesium stearate, 10-20 parts of the glycerol and 50-60 parts of the distilled water.

[0013] The present application also provides a preparation method of the concrete based on the iron mine tailings, which comprises the following steps:

[0014] S1, the polyacrylamide solution is heated to 100-120 DEG C, and when the temperature reaches, stirring is carried out, the stirring speed is 80 rpm, and the stirring time is 45-60 min; the magnesium oxide powder and the polypropylene fiber are added at the 10th min of the stirring; the resin and the cellulose acetate butyrate powder are added at the 20th min of the stirring; and finally the antioxidant is added at the 30th min of the stirring to obtain the adhesive liquid;

[0015] S2, the montmorillonite powder, the iron oxide powder and the corn starch are mixed, and are ground to 10-15 nm through a grinding process to obtain the water reducing agent;

[0016] S3, the adhesive liquid is added into the tap water, and after being uniformly mixed, a mixture is obtained, and the mixture is put into a cement mixer;

[0017] S4, the iron mine tailings, the river sand and the acid salt cement are put into the cement mixer containing the mixture in the step S3, and are stirred, and the water reducing agent is added during the stirring, and after being uniformly mixed, the concrete is obtained.

[0018] As a further optimization scheme of the present application, the stirring time in the step S4 is 20-35 min, and the stirring speed is 60 rpm.

[0019] The present application has the beneficial effect that the existing addition of the iron mine tailings in the concrete can cause the decrease of the compressive strength and the flexural strength, while in the present application, the iron mine tailings, the polyacrylamide solution, the magnesium oxide powder and the cellulose acetate butyrate powder are mutually synergistic, the influence of the iron mine tailings on the compressive strength and the flexural strength of the concrete is reduced, the content of the iron mine tailings in the concrete is increased, and the consumption of the iron mine tailings is increased. DETAILED DESCRIPTION

[0020] The following further describes the present application in detail, it is necessary to point out here that the following detailed description is only used to further illustrate the present application, and cannot be understood as limiting the scope of protection of the present application, and those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0021] Example 1

[0022] The concrete of the present embodiment, the preparation method is:

[0023] The polyacrylamide colloid is put into a container and stirred for 30 min, and pure water is added and mixed during stirring. After sufficient mixing, a polyacrylamide solution is obtained. The stirring speed is 60 rpm, and the mass ratio of polyacrylamide colloid to pure water is 1:5.

[0024] 30 parts of furfuryl alcohol resin and 10 parts of rosin are heated and fused to obtain a resin; 20 parts of palmitic acid, 6 parts of magnesium stearate, and 10 parts of glycerol are mixed, and then 50 parts of distilled water is added and heated to 80°C to obtain an antioxidant;

[0025] The polyacrylamide solution is heated to 100°C, and stirring is performed when the temperature reaches 100°C. The stirring speed is 80 rpm, and the stirring time is 45 min. At the 10th min of stirring, 3 parts of magnesium oxide powder and 20 parts of polypropylene fiber are added. At the 20th min of stirring, 5 parts of resin and 5 parts of cellulose acetate butyrate powder are added. Finally, at the 30th min of stirring, 10 parts of antioxidant is added to obtain a binding liquid.

[0026] 6 parts of montmorillonite powder, 10 parts of iron oxide powder, and 3 parts of corn starch are mixed and ground to 10 nm by a grinding process to obtain a water reducing agent.

[0027] 5 parts of the binding liquid are added to 60 parts of tap water, and the mixture is obtained after uniform mixing. The mixture is put into a cement mixer;

[0028] 20 parts of iron ore tailings, 10 parts of river sand, and 35 parts of portland cement are put into the cement mixer containing the mixture, and stirring is performed (the stirring time is 20 min, and the stirring speed is 60 rpm). During stirring, 8 parts of water reducing agent is added, and the concrete is obtained after uniform mixing.

[0029] Example 2

[0030] The concrete of the present embodiment, the preparation method is:

[0031] The polyacrylamide colloid is put into a container and stirred for 35 min, and pure water is added and mixed during stirring. After sufficient mixing, a polyacrylamide solution is obtained. The stirring speed is 60 rpm, and the mass ratio of polyacrylamide colloid to pure water is 1:5.

[0032] Heat and fuse 35 parts of furfuryl alcohol resin and 15 parts of rosin to obtain a resin; mix 28 parts of palmitic acid, 8 parts of magnesium stearate, and 15 parts of glycerol, then add 55 parts of distilled water, and heat to 100°C to obtain an antioxidant;

[0033] Heat 25 parts of polyacrylamide solution to 110°C, and stir when the temperature reaches, the stirring speed is 80 rpm, and the stirring time is 50 min; 5 parts of magnesium oxide powder and 22 parts of polypropylene fiber are added at the 10th min of stirring, 8 parts of resin and 8 parts of cellulose acetate butyrate powder are added at the 20th min of stirring, and finally 14 parts of antioxidant are added at the 30th min of stirring to obtain a binding liquid;

[0034] Mix 8 parts of montmorillonite powder, 12 parts of iron oxide powder, and 6 parts of corn starch, grind to 13 nm through a grinding process to obtain a water reducing agent;

[0035] Add 8 parts of the binding liquid to 70 parts of tap water, mix uniformly to obtain a mixture, and pour the mixture into a cement mixer;

[0036] Put 30 parts of iron ore tailings, 12 parts of river sand, and 40 parts of portland cement into the cement mixer containing the mixture, stir (the stirring time is 30 min, and the stirring speed is 60 rpm), add 10 parts of the water reducing agent during stirring, and mix uniformly to obtain concrete.

[0037] Example 3

[0038] The concrete of the example is prepared by the following method:

[0039] Put the polyacrylamide colloid into a container and stir for 45 min, add pure water during stirring, mix uniformly, and obtain a polyacrylamide solution, the stirring speed is 60 rpm, and the mass ratio of the polyacrylamide colloid to pure water is 1:5;

[0040] Heat and fuse 45 parts of furfuryl alcohol resin and 20 parts of rosin to obtain a resin; mix 35 parts of palmitic acid, 10 parts of magnesium stearate, and 20 parts of glycerol, then add 60 parts of distilled water, and heat to 120°C to obtain an antioxidant;

[0041] Heat 30 parts of polyacrylamide solution to 120°C, and stir when the temperature reaches, the stirring speed is 80 rpm, and the stirring time is 60 min; 6 parts of magnesium oxide powder and 25 parts of polypropylene fiber are added at the 10th min of stirring, 10 parts of resin and 12 parts of cellulose acetate butyrate powder are added at the 20th min of stirring, and finally 18 parts of antioxidant are added at the 30th min of stirring to obtain a binding liquid;

[0042] Mixing 10 parts of montmorillonite powder, 15 parts of iron oxide powder, 8 parts of corn starch, grinding to 15 nm by grinding process to obtain a water reducing agent;

[0043] Add 10 parts of the binding liquid to 80 parts of tap water, mix uniformly to obtain a mixture, and then put the mixture into a cement mixer;

[0044] Put 35 parts of iron ore tailings, 15 parts of river sand, and 45 parts of portland cement into the cement mixer containing the mixture, stir (stirring time is 35 min, stirring speed is 60 rpm), add 15 parts of the water reducing agent during stirring, and mix uniformly to obtain the concrete.

[0045] Comparative Example 1

[0046] Preparation method of the comparative example concrete:

[0047] Put the epoxy resin colloid into a container and stir for 35 min, add pure water during stirring, mix thoroughly to obtain an epoxy resin solution, the stirring speed is 60 rpm, and the mass ratio of the epoxy resin colloid to pure water is 1:5;

[0048] Heat and fuse 35 parts of furfuryl alcohol resin and 15 parts of rosin to obtain a resin; mix 28 parts of palmitic acid, 8 parts of magnesium stearate, and 15 parts of glycerol, then add 55 parts of distilled water, and heat to 100℃ to obtain an antioxidant;

[0049] Heat 25 parts of the epoxy resin solution to 110℃, and stir when the temperature reaches, the stirring speed is 80 rpm, and the stirring time is 50 min; add 5 parts of magnesium oxide powder and 22 parts of polypropylene fiber at the 10th min of stirring, add 8 parts of the resin and 8 parts of cellulose acetate butyrate powder at the 20th min of stirring, and finally add 14 parts of the antioxidant at the 30th min of stirring to obtain the binding liquid;

[0050] Mix 8 parts of montmorillonite powder, 12 parts of iron oxide powder, and 6 parts of corn starch, grind to 13 nm by grinding process to obtain a water reducing agent;

[0051] Add 8 parts of the binding liquid to 70 parts of tap water, mix uniformly to obtain a mixture, and then put the mixture into a cement mixer;

[0052] Put 30 parts of iron ore tailings, 12 parts of river sand, and 40 parts of portland cement into the cement mixer containing the mixture, stir (stirring time is 30 min, stirring speed is 60 rpm), add 10 parts of the water reducing agent during stirring, and mix uniformly to obtain the concrete.

[0053] Comparative Example 2

[0054] Preparation method of the comparative example concrete:

[0055] The polyacrylamide glue is put into a container and stirred for 35 min, and pure water is added and mixed during stirring, and a polyacrylamide solution is obtained after sufficient mixing, the stirring speed is 60 rpm, and the mass ratio of the polyacrylamide glue to the pure water is 1:5;

[0056] 35 parts of furfuryl alcohol resin and 15 parts of rosin are heated and fused to obtain a resin; 28 parts of palmitic acid, 8 parts of magnesium stearate, and 15 parts of glycerol are mixed, and then 55 parts of distilled water are added and heated to 100 DEG C to obtain an antioxidant;

[0057] The polyacrylamide solution is heated to 110 DEG C, and stirring is performed after the temperature reaches, the stirring speed is 80 rpm, and stirring is performed for 50 min, 24.5 parts of polypropylene fiber is added at the 10th min of stirring, 8.5 parts of resin and 8.5 parts of cellulose acetate butyrate powder are added at the 20th min of stirring, and finally 16 parts of antioxidant is added at the 30th min of stirring to obtain a binding liquid;

[0058] 8 parts of montmorillonite powder, 12 parts of iron oxide powder, and 6 parts of corn starch are mixed and ground to 13 nm by a grinding process to obtain a water reducing agent;

[0059] 8 parts of the binding liquid are added to 70 parts of tap water, and a mixture is obtained after uniform mixing, and the mixture is put into a cement mixer;

[0060] 30 parts of iron ore tailings, 12 parts of river sand, and 40 parts of portland cement are put into the cement mixer containing the mixture, and stirring is performed (the stirring time is 30 min, and the stirring speed is 60 rpm), 10 parts of the water reducing agent is added during stirring, and concrete is obtained after uniform mixing.

[0061] Comparative Example 3

[0062] The concrete of the present comparative example is prepared by the following method:

[0063] The polyacrylamide glue is put into a container and stirred for 35 min, and pure water is added and mixed during stirring, and a polyacrylamide solution is obtained after sufficient mixing, the stirring speed is 60 rpm, and the mass ratio of the polyacrylamide glue to the pure water is 1:5;

[0064] 35 parts of furfuryl alcohol resin and 15 parts of rosin are heated and fused to obtain a resin; 28 parts of palmitic acid, 8 parts of magnesium stearate, and 15 parts of glycerol are mixed, and then 55 parts of distilled water are added and heated to 100 DEG C to obtain an antioxidant;

[0065] Heat 27.6 parts of polyacrylamide solution to 110°C, stir when the temperature reaches, stirring speed is 80 rpm, stirring for 50 min, add 5.6 parts of magnesium oxide powder and 24.3 parts of polypropylene fiber at the 10th min of stirring, add 9 parts of resin at the 20th min of stirring, and finally add 15.5 parts of antioxidant at the 30th min of stirring to obtain a binding liquid;

[0066] Mix 8 parts of montmorillonite powder, 12 parts of iron oxide powder and 6 parts of corn starch, and grind to 13 nm by grinding process to obtain a water reducing agent;

[0067] Add 8 parts of the binding liquid to 70 parts of tap water, mix uniformly to obtain a mixture, and then put the mixture into a cement mixer;

[0068] Put 30 parts of iron ore tailings, 12 parts of river sand and 40 parts of portland cement into the cement mixer containing the mixture, stir (stirring time is 30 min, stirring speed is 60 rpm), add 10 parts of the water reducing agent during stirring, and mix uniformly to obtain concrete.

[0069] Comparative Example 4

[0070] The preparation method of the comparative example concrete is as follows:

[0071] Mix 8 parts of montmorillonite powder, 12 parts of iron oxide powder and 6 parts of corn starch, and grind to 13 nm by grinding process to obtain a water reducing agent;

[0072] Add 8 parts of the binding liquid to 70 parts of tap water, mix uniformly to obtain a mixture, and then put the mixture into a cement mixer;

[0073] Put 12 parts of river sand and 40 parts of portland cement into the cement mixer containing the mixture, stir (stirring time is 30 min, stirring speed is 60 rpm), add 10 parts of the water reducing agent during stirring, and mix uniformly to obtain concrete.

[0074] Comparative Example 5

[0075] The preparation method of the comparative example concrete is as follows:

[0076] Mix 8 parts of montmorillonite powder, 12 parts of iron oxide powder and 6 parts of corn starch, and grind to 13 nm by grinding process to obtain a water reducing agent;

[0077] Put 30 parts of iron ore tailings, 12 parts of river sand and 40 parts of portland cement into the cement mixer containing the mixture, stir (stirring time is 30 min, stirring speed is 60 rpm), add 10 parts of the water reducing agent during stirring, and mix uniformly to obtain concrete.

[0078] (I) Performance test

[0079] 1.1, Take the concrete samples prepared in Examples 1-3 and Comparative Examples 1-5, and test the compressive strength and flexural strength at 3d and 28d according to the Standard for Testing and Evaluation of Concrete Strength GB / T50107-2010. The Portland cement used in the test is purchased from Jianghuai Building Material Technology Co., Ltd. in Wuxi, the river sand is selected according to the ISO standard sand, and the iron ore tailings are special fine sand with fineness modulus of 1.5-0.7 according to GB / T31288-2014.

[0080] Table 1 Product performance test

[0081]

[0082]

[0083] The test results are shown in Table 1 above. Comparing Examples 1-3, it is found that the concrete prepared according to the weight ratio in Example 2 has the best compressive strength and flexural strength. Comparing Comparative Example 1 with Example 2, it is found that the difference between Comparative Example 1 and Example 2 is that the polyacrylamide solution in Comparative Example 1 is changed to an epoxy resin solution, which makes the compressive strength and flexural strength of Comparative Example 1 worse than that of Example 2. Comparing Comparative Example 2 with Example 2, it is found that the difference between Comparative Example 2 and Example 2 is that no magnesium oxide powder is added in Comparative Example 2, which makes the compressive strength and flexural strength of Comparative Example 2 worse than that of Example 2. Comparing Comparative Example 3 with Example 2, it is found that the difference between Comparative Example 3 and Example 2 is that Comparative Example 3 lacks cellulose acetate butyrate powder, which makes the compressive strength and flexural strength of Comparative Example 3 worse than that of Example 2. Comparing Comparative Example 4 with Example 2, it is found that the difference between Comparative Example 4 and Example 2 is that Comparative Example 4 lacks iron ore tailings and adhesive liquid, which makes the compressive strength and flexural strength of Comparative Example 4 better than that of Example 2 at 3d, but slightly lower than that of Example 2 after 28d. Comparing Comparative Example 5 with Example 2, it is found that the difference between Comparative Example 5 and Example 2 is that Comparative Example 5 lacks adhesive liquid, which makes the compressive strength and flexural strength of Comparative Example 5 worse than that of Example 2 at 3d and 28d.

[0084] In summary, there are many factors that affect the compressive strength and flexural strength of concrete, among which the addition of polyacrylamide solution, magnesium oxide powder, cellulose acetate butyrate powder, iron oxide powder and antioxidant in concrete has a greater impact on the compressive strength and flexural strength of concrete, and the existing addition of iron ore tailings in concrete will cause the compressive strength and flexural strength to decrease, while in the present application, the iron ore tailings, polyacrylamide solution, magnesium oxide powder and cellulose acetate butyrate powder synergize with each other, so that the compressive strength and flexural strength of the concrete of Example 2 at 28d are greater than those of Comparative Example 4 without the addition of iron ore tailings.

[0085] 1.2, take the concrete samples prepared in Examples 1-3 and Comparative Examples 1-5, respectively, and place them in containers, and detect the initial setting time and final setting time of the concrete samples prepared in Examples 1-3 and Comparative Examples 1-4 in a -5℃ environment using a Vicat apparatus.

[0086] Table 2 Product performance test

[0087] Group Initial setting time / min Final setting time / min Example 1 50 155 Example 2 45 150 Example 3 48 150 Comparative Example 1 56 240 Comparative Example 2 65 245 Comparative Example 3 60 240 Comparative Example 4 45 160 Comparative Example 5 63 180

[0088] The test results are shown in Table 2 above. It can be seen from the comparison that the initial setting time of the concrete prepared by the method of Example 2 is the same as that of Comparative Example 4, but the final setting time is longer than that of Example 2, which shows that the addition of iron ore tailings does not affect the initial setting time of the concrete but affects the final setting time of the concrete, and the addition of polyacrylamide solution, magnesium oxide powder, cellulose acetate butyrate powder and iron ore tailings in Example 2 synergize with each other, which can help shorten the final setting time of the concrete.

[0089] The above-described examples only express several embodiments of the present application, which are described in detail and in detail, but should not be construed as limiting the scope of the present patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application.

Claims

1. A type of concrete based on iron ore tailings, characterized in that, The raw materials for preparing the concrete include iron ore tailings, river sand, silicate cement, tap water, adhesive liquid and water-reducing agent. The raw materials for preparing the adhesive liquid, by weight, are: 20-30 parts polyacrylamide solution, 3-6 parts magnesium oxide powder, 5-10 parts resin, 20-25 parts polypropylene fiber, 10-18 parts antioxidant and 5-12 parts cellulose acetate butyrate powder; the raw materials for preparing the water-reducing agent are: 6-10 parts montmorillonite powder, 10-15 parts iron oxide powder and 3-8 parts corn starch.

2. The concrete based on iron ore tailings according to claim 1, characterized in that, The raw materials for preparing the concrete, by weight, are: 20-35 parts iron ore tailings, 10-15 parts river sand, 35-45 parts silicate cement, 60-80 parts tap water, 5-10 parts adhesive liquid and 8-15 parts water-reducing agent.

3. The concrete based on iron ore tailings according to claim 2, characterized in that, The preparation process of the polyacrylamide solution is as follows: polyacrylamide colloid is placed in a container and stirred for 30-45 minutes. During the stirring process, pure water is added and mixed with it. After thorough mixing, a polyacrylamide solution is obtained. The stirring speed is 60 rpm.

4. The concrete based on iron ore tailings according to claim 3, characterized in that, The mass ratio of the polyacrylamide colloid to pure water is 1:

5.

5. The concrete based on iron ore tailings according to claim 1, characterized in that, The resin is prepared by heating and fusing furfuryl alcohol resin and rosin to obtain the resin; the antioxidant is prepared by mixing palmitic acid, magnesium stearate and glycerin, then adding distilled water and heating to 80-120℃ to obtain the antioxidant.

6. The concrete based on iron ore tailings according to claim 5, characterized in that, The raw materials for preparing the resin, by weight, are: 30-45 parts furfuryl alcohol resin and 10-20 parts rosin; the raw materials for preparing the antioxidant are: 20-35 parts palmitic acid, 6-10 parts magnesium stearate, 10-20 parts glycerol and 50-60 parts distilled water.

7. A method for preparing concrete based on iron ore tailings as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Heat the polyacrylamide solution to 100-120℃. Once the temperature is reached, stir at 80 rpm for 45-60 minutes. Add magnesium oxide powder and polypropylene fiber at the 10th minute of stirring. Add resin and cellulose acetate butyrate powder at the 20th minute of stirring. Finally, add antioxidant at the 30th minute of stirring to obtain the adhesive liquid. S2, Montmorillonite powder, iron oxide powder and corn starch are mixed and ground to 10-15nm by a grinding process to obtain a water-reducing agent; S3, add the adhesive liquid to tap water, mix well to obtain a mixture, and put the mixture into a cement mixer; S4. Iron ore tailings, river sand and acid cement are put into the cement mixer containing the mixture in step S3 and stirred. Water-reducing agent is added during stirring. After mixing evenly, concrete is obtained.

8. The method for preparing concrete based on iron ore tailings according to claim 7, characterized in that, The stirring time in step S4 is 20-35 minutes, and the stirring speed is 60 rpm.

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