CN113402209A

CN113402209A - Foam concrete containing phosphorus slag and preparation method thereof

Info

Publication number: CN113402209A
Application number: CN202110701974.2A
Authority: CN
Inventors: 陈汉飞; 曹耀江; 欧杰; 陈钟; 彭晖英
Original assignee: Guangdong Yongtai Concrete Co ltd
Current assignee: Guangdong Yongtai Concrete Co ltd
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2021-09-17

Abstract

The application relates to the field of building materials, and particularly discloses foam concrete containing phosphorous slag and a preparation method thereof. The foam concrete containing the phosphorous slag is prepared from a concrete mixture, wherein the concrete mixture comprises the following components in parts by weight: cement 400-410 parts; 100 portions and 105 portions of phosphorus slag; 40-50 parts of stone powder; 1-3 parts of a foaming agent; water 120-; 3-5 parts of quicklime; 1-2 parts of calcium borate; 0.3-0.7 part of ferric sulfate. The preparation method comprises the following steps: step 1, preparing a gel material; step 2, preparing intermediate mixture; step 3, preparing concrete mixture; and 4, pouring, maintaining and forming. The foam concrete containing the phosphorous slag has the advantages that the better strength performance and heat preservation performance can be simultaneously kept; in addition, the preparation method has the advantages of simple and convenient operation and easy industrial production.

Description

Foam concrete containing phosphorus slag and preparation method thereof

Technical Field

The application relates to the field of building materials, in particular to foamed concrete containing phosphorous slag and a preparation method thereof.

Background

The foamed concrete is a novel light heat-insulating material containing a large number of closed air holes, which is formed by fully foaming a foaming agent in a mechanical mode through a foaming system of a foaming machine, uniformly mixing the foam with cement slurry, then carrying out cast-in-place construction or mould forming through a pumping system of the foaming machine and carrying out natural curing. Because the foam concrete has good heat insulation performance, sound insulation and fire resistance performance and waterproof performance, the foam concrete is widely applied to building construction.

The phosphorus slag is low-melting-point slag regularly discharged from the furnace when yellow phosphorus is produced by an electric furnace method, about 8-10 tons of phosphorus slag are discharged when 1 ton of yellow phosphorus is produced, and the environmental pollution is continuously intensified along with the discharge of a large amount of phosphorus slag. Therefore, in order to more effectively utilize the phosphorous slag, the phosphorous slag is generally added to the foamed concrete as an aggregate.

In view of the above-mentioned related technologies, the inventor believes that the main components of the phosphorous slag are silicate and aluminate glass bodies, the content of the glass bodies is 85% -90%, and in addition, the phosphorous slag also contains a small amount of fine crystals, and pseudowollastonite, quartz, calcite, calcium fluoride, dicalcium silicate and tricalcium silicate exist in a crystalline phase, so that the phosphorous slag has high mineral activity, but does not have hydraulic activity, and substances without hydraulic activity after being mixed into concrete must be alkaline-excited by calcium hydroxide which is a hydration product of cement clinker to generate hydration reaction to generate a cementitious hydration product, so that the early strength of the foam concrete is easily reduced. Thus, there is still room for improvement.

Disclosure of Invention

In order to reduce the influence of phosphorus slag on the strength performance of the foam concrete, the application provides the foam concrete containing the phosphorus slag and a preparation method thereof.

In a first aspect, the present application provides a foamed concrete containing phosphorous slag, which adopts the following technical scheme:

the foam concrete containing the phosphorous slag is prepared from a concrete mixture, wherein the concrete mixture comprises the following components in parts by weight:

cement 400-410 parts;

100 portions and 105 portions of phosphorus slag;

40-50 parts of stone powder;

1-3 parts of a foaming agent;

water 120-;

3-5 parts of quicklime;

1-2 parts of calcium borate;

0.3-0.7 part of ferric sulfate.

By adopting the technical scheme, the quicklime is added, so that the hydration reaction of the phosphorous slag can be better excited, the generation speed of a hydration product can be accelerated, and the early strength of the foam concrete can be better improved.

By adding calcium borate and ferric sulfate for synergistic compounding, the influence of quicklime on a foaming agent is favorably relieved, so that the foaming of the foam concrete is more difficult to influence, and the foam concrete is favorably kept better in heat preservation performance and early strength performance; meanwhile, the synergistic compounding of calcium borate and ferric sulfate is also beneficial to better reducing the influence of quick lime on the later strength of the foam concrete to a certain extent and is beneficial to better keeping the strength performance of the foam concrete.

In conclusion, by adopting the synergistic compounding of the quicklime, the calcium borate and the ferric sulfate, the strength performance of the foam concrete is not easily affected when the phosphorous slag is added into the foam concrete, the range of recycling the phosphorous slag is favorably expanded, and the energy is favorably saved; meanwhile, the prepared foam concrete can better keep better heat insulation performance and strength performance at the same time, and the pores in the foam concrete are less likely to influence the strength performance of the foam concrete.

Preferably, the concrete mixture further comprises the following components in parts by weight:

0.1-0.5 part of polyethylene glycol.

By adopting the technical scheme, the polyethylene glycol is added, so that the components can be better and uniformly dispersed in the foam concrete, the synergistic compounding of the quicklime, the calcium borate and the ferric sulfate can be better promoted, the prepared foam concrete can better keep better heat insulation performance and strength performance, and the strength performance of the foam concrete is less susceptible to the influence of the addition of the phosphorous slag and the influence of internal pores.

13-16 parts of indium tin oxide;

8-13 parts of zirconium dioxide.

By adopting the technical scheme, the indium tin oxide and the zirconium dioxide are added to be compounded in a synergistic manner, so that the influence of the quicklime on the later strength of the foam concrete is favorably reduced, and the foam concrete is favorably kept with better heat preservation performance and better later strength performance.

Preferably, the foaming agent comprises one or more of calcium carbonate, magnesium carbonate, silicon carbide, aluminum powder and carbon black.

By adopting the technical scheme, one or more substances in the foam are used as the foaming agent, so that the influence of the phosphorus slag on the foaming of the foam concrete is favorably reduced, the early strength of the foam concrete is not easily influenced by the phosphorus slag, and the foam concrete is favorably kept with better heat insulation performance.

Preferably, the foaming agent is prepared by mixing calcium carbonate and aluminum powder in a ratio of 1: 2-3 by mass ratio.

By adopting the technical scheme, the calcium carbonate and the aluminum powder in a specific proportion are cooperatively compounded to serve as the foaming agent, so that the foaming agent is favorably matched with the quicklime better, the foam concrete is more difficultly influenced by the quicklime during foaming, and the foam concrete is favorably kept better in heat insulation performance, early strength and later strength.

Preferably, the particle size of the phosphorous slag is 150-200 meshes; the particle size of the stone powder is 300-400 meshes.

By adopting the technical scheme, the particle size ranges of the phosphorus slag and the mountain flour are controlled, so that aggregates in the foam concrete can be uniformly dispersed in the foam concrete better, and meanwhile, the aggregates in the foam concrete can be stacked more densely, so that the compactness of the prepared foam concrete is improved, and the later strength of the foam concrete can be improved better.

Preferably, the particle size of the phosphorous slag is 150-170 meshes; the particle size of the stone powder is 300-325 meshes;

the foaming agent is prepared from calcium carbonate and aluminum powder in a weight ratio of 1: 2-3 by mass ratio;

the concrete mixture also comprises the following components in parts by weight:

0.1-0.5 part of polyethylene glycol;

13-16 parts of indium tin oxide;

8-13 parts of zirconium dioxide.

By adopting the technical scheme, the influence of the phosphorus slag and the quicklime on the performance of the foam concrete can be relieved better, and the foam concrete can keep better heat preservation performance, early strength performance and late strength performance at the same time.

In a second aspect, the present application provides a method for preparing foamed concrete containing phosphorous slag, which adopts the following technical scheme:

a preparation method of foam concrete containing phosphorous slag comprises the following steps:

step 1, mixing cement, phosphorous slag, stone powder, quicklime and half mass of water, and uniformly stirring to form a gelled material;

step 2, adding a foaming agent, calcium borate and ferric sulfate into the gelled material, and uniformly stirring to form an intermediate mixture;

step 3, adding the remaining half mass of water into the intermediate mixture, and uniformly stirring to obtain a concrete mixture;

and 4, pouring the concrete mixture according to the requirement, and curing and forming to obtain the foam concrete containing the phosphorous slag.

Preferably, 0.1 to 0.5 part by weight of polyethylene glycol is also added in the step 2.

Preferably, 13-16 parts by mass of indium tin oxide and 8-13 parts by mass of zirconium dioxide are also added in the step 2.

By adopting the technical scheme, the concrete can be prepared by a conventional mixing method, the operation is simple and convenient, and the method is favorable for better realizing industrial production of the foam concrete.

In summary, the present application has the following beneficial effects:

1. according to the method, the quicklime is added, so that the influence of phosphorus slag on the early strength of the foam concrete can be reduced better, the calcium borate and the ferric sulfate are added for synergistic compounding, the influence of the quicklime on the foaming and later strength of the foam concrete can be reduced better, and the concrete can be kept better in heat preservation performance, early strength performance and later strength performance.

2. In the application, the polyethylene glycol is preferably compounded with the quick lime, the calcium borate and the ferric sulfate in a synergistic manner, so that the synergistic cooperation of the quick lime, the calcium borate and the ferric sulfate is favorably promoted, and the concrete can better keep better heat preservation performance, early strength performance and late strength performance.

3. In the application, indium tin oxide and zirconium dioxide are preferably compounded in a synergistic manner, so that the influence of quicklime on the foaming and later strength of the foam concrete is favorably reduced, and the heat preservation performance and the later strength performance of the foam concrete are favorably improved.

4. The preparation of the concrete can be realized by a conventional method, the operation is simple and convenient, and the industrial production is favorably realized.

Detailed Description

The present application will be described in further detail with reference to examples.

The following examples and comparative raw material sources are shown in table 1.

TABLE 1

Raw materials	Source manufacturer	Model number
			Cement	Fujian Ji materials information technology Co Ltd	732159
Phosphorous slag	Yunnan Tenglong science and technology development Co Ltd	-
			Stone powder	Shanghai Yunkang New Material science and technology Co Ltd	-
Polyethylene glycol	Jiangsu Hai'an petrochemical plant	PEG-4000
			Indium tin oxide	Last-sea detection of new-material technology Limited	991611
Zirconium dioxide	Shandong Kepler Biotech Co., Ltd	kpl-88551

Example 1

The embodiment discloses a concrete mixture, which comprises the following components by mass:

400kg of cement; 105kg of phosphorous slag; 45kg of stone powder; 1kg of foaming agent; 130kg of water; 3kg of quicklime; 1kg of calcium borate; 0.3kg of ferric sulfate;

in this example, the foaming agent was sodium carbonate; the grain size of the phosphorous slag is 140 meshes, and the grain size of the stone powder is 270 meshes.

The embodiment also discloses a preparation method of the foamed concrete containing the phosphorous slag, which comprises the following steps:

step 1, adding cement, phosphorous slag, stone powder, quicklime and half mass of water into a stirring kettle, stirring at a rotating speed of 50r/min, and uniformly stirring to form a gelled material.

And 2, adding the foaming agent, calcium borate and ferric sulfate into the gelled material while stirring, and uniformly stirring to form an intermediate stirred material.

And 3, adding the remaining half mass of water into the intermediate mixture while stirring, and uniformly stirring to obtain the concrete mixture.

And 4, pouring the concrete mixture into a forming template according to actual needs, standing and maintaining, controlling the maintenance temperature to be 32 ℃ and the humidity to be 85%, and maintaining for 30 days to obtain the foam concrete containing the phosphorous slag.

Example 2

The difference from example 1 is that:

the foam concrete containing the phosphorous slag comprises the following components in percentage by weight:

405kg of cement; 100kg of phosphorous slag; 50kg of stone powder; 3kg of foaming agent; 120kg of water; 5kg of quicklime; 2kg of calcium borate; 0.7kg of ferric sulfate.

Wherein the grain diameter of the phosphorous slag is 180 meshes, and the grain diameter of the stone powder is 400 meshes

Example 3

The difference from example 1 is that:

410kg of cement; 103kg of phosphorous slag; 40kg of stone powder; 2kg of foaming agent; 125kg of water; 4kg of quicklime; 1.5kg of calcium borate; 0.5kg of ferric sulfate.

Wherein the grain diameter of the phosphorous slag is 140 meshes, and the grain diameter of the stone powder is 400 meshes

Example 4

The difference from example 3 is that: 0.1kg of polyethylene glycol was also added in step 2.

Example 5

The difference from example 3 is that: 0.5kg of polyethylene glycol was also added in step 2.

Example 6

The difference from example 3 is that: 13kg of indium tin oxide and 13kg of zirconium dioxide are also added in step 2.

Example 7

The difference from example 3 is that: in step 2, 16kg of indium tin oxide and 8kg of zirconium dioxide are also added.

Example 8

The difference from example 3 is that: in step 2, 24kg of zirconium dioxide are also added.

Example 9

The difference from example 3 is that: in step 2, 24kg of indium tin oxide was also added.

Example 10

The difference from example 3 is that: the foaming agent is magnesium carbonate.

Example 11

The difference from example 3 is that: the foaming agent is prepared by uniformly mixing calcium carbonate and aluminum powder in a mass ratio of 1: 2.

Example 12

The difference from example 3 is that: the foaming agent is prepared by uniformly mixing calcium carbonate and aluminum powder in a mass ratio of 1: 3.

Example 13

The difference from example 3 is that: the foaming agent is prepared by uniformly mixing magnesium carbonate and aluminum powder in a mass ratio of 1: 3.

Example 14

The difference from example 3 is that: the foaming agent is prepared by uniformly mixing calcium carbonate and magnesium carbonate in a mass ratio of 1: 3.

Example 15

The difference from example 3 is that: the grain size of the phosphorous slag is 150 meshes, and the grain size of the stone powder is 400 meshes.

Example 16

The difference from example 3 is that: the grain size of the phosphorous slag is 200 meshes, and the grain size of the stone powder is 300 meshes.

Example 17

The difference from example 3 is that:

0.1kg of polyethylene glycol, 13kg of indium tin oxide and 13kg of zirconium dioxide are also added in the step 2.

The particle size of the phosphorus slag is 150 meshes, and the particle size of the stone powder is 325 meshes;

the foaming agent is prepared by uniformly mixing calcium carbonate and aluminum powder in a mass ratio of 1: 2.

Example 18

The difference from example 3 is that:

0.5kg of polyethylene glycol, 16kg of indium tin oxide and 8kg of zirconium dioxide are also added in the step 2.

The particle size of the phosphorus slag is 170 meshes, and the particle size of the stone powder is 300 meshes;

the foaming agent is prepared by uniformly mixing calcium carbonate and aluminum powder in a mass ratio of 1: 3.

Comparative example 1

The difference from example 3 is that: equal amount of stone powder is used to replace phosphorus slag, quicklime, calcium borate and ferric sulfate.

Comparative example 2

The difference from example 3 is that: equal amount of stone powder is used to replace quicklime, calcium borate and ferric sulfate.

Comparative example 3

The difference from example 3 is that: equal amount of stone powder is used to replace calcium borate and ferric sulfate.

Comparative example 4

The difference from example 3 is that: equal amount of stone powder is used to replace calcium borate.

Comparative example 5

The difference from example 3 is that: the same amount of stone powder is used to replace ferric sulfate.

Experiment 1

The concrete mixture prepared in the above examples and comparative examples was poured into a 3cm by 3cm cube test piece, and the 3d, 7d, 28d, 90d compressive strengths (MPa) of the above examples and comparative test pieces were measured according to the 5 compressive strength test in GB/T50081 and 2019, standards of methods for testing physical and mechanical properties of concrete.

Experiment 2

The concrete mixes prepared in the above examples and comparative examples were cast into 3cm by 3cm cubic test pieces, and the thermal conductivity (W/(m · k)) of the above examples and comparative test pieces was measured from 7.3.2 thermal conductivity in JG/T266-2011 foam concrete.

The data from the above experiments are shown in Table 2.

TABLE 2

According to the comparison of the data of the comparative example 1 and the comparative example 2 in the table 2, compared with the comparative example 1, the phosphorus slag is newly added in the comparative example 2, the later strength of the comparative example 2 is higher than that of the comparative example 1, but the early strength is relatively reduced, and the fact that the phosphorus slag is added into the foam concrete is beneficial to improving the later strength of the foam concrete, but the early strength of the foam concrete is easily influenced.

According to the comparison of the data of the comparative example 2 and the comparative example 3 in the table 2, the quicklime is newly added in the comparative example 3 compared with the comparative example 2, the early strength of the comparative example 3 is higher than that of the comparative example 2, but the late strength of the comparative example 2 is lower than that of the comparative example 3 to a certain extent, and the thermal conductivity of the comparative example 2 is higher than that of the comparative example 3 to a certain extent, namely, the thermal insulation performance of the comparative example 2 is poorer than that of the comparative example 3, which shows that the influence of the phosphorous slag on the early strength of the foam concrete is favorably relieved by adding the quicklime, but the influence of the quicklime on the late strength and the foaming of the foam concrete is easily caused.

According to the comparison of the data of comparative examples 3-5 and example 3 in table 2, comparative example 4 and comparative example 5 respectively add ferric sulfate and calcium borate more than comparative example 3, comparative example 3 adds ferric sulfate and calcium borate more than comparative example 3, the later strength and the thermal conductivity of comparative example 4 and comparative example 5 are similar to those of comparative example 3, the later strength performance and the thermal insulation performance of example 3 are superior to those of comparative example 4 and comparative example 5, which shows that the influence of quicklime on the later strength and foaming of the foam concrete can be better alleviated only by adding ferric sulfate and calcium borate for synergistic compounding, so that the foam concrete can better maintain better thermal insulation performance, early strength performance and later strength performance.

According to the comparison of the data of the examples 3-5 in the table 2, the polyethylene glycol is newly added in the examples 4-5 compared with the example 3, and the early strength performance, the late strength performance and the heat preservation performance of the examples 4-5 are all better than those of the example 3 to a certain extent, which shows that the addition of the polyethylene glycol is beneficial to better promoting the synergistic combination of the quicklime, the ferric sulfate and the calcium borate, so that the strength performance and the foaming of the foam concrete are less susceptible to the influence of the phosphorous slag and the quicklime.

According to the comparison of the data of the example 3 and the examples 6-9 in the table 2, the examples 6-7 are all added with indium tin oxide and zirconium dioxide more than the example 3, the example 8 is added with indium tin oxide more than the example 3, and the example 9 is added with zirconium dioxide more than the example 3, while the later strength performance and the heat preservation performance of the examples 6-7 are better than those of the example 3, and the later strength performance and the heat preservation performance of the examples 8-9 are similar to those of the example 3, which shows that only by adding indium tin oxide and zirconium dioxide at the same time to cooperate with each other, the influence of the quicklime on the foam concrete can be relieved better, and the effect cannot be achieved by adding any substance alone.

According to the comparison of the data of example 3 and examples 10-14 in Table 2, the specific foaming agent is adopted, so that the influence of the phosphorous slag on the early strength and foaming of the foam concrete is favorably reduced, and the later strength performance and the heat preservation performance of the foam concrete are better.

According to the comparison of the data of the embodiment 3 and the embodiments 15 to 16 in the table 2, the particle sizes of the phosphorous slag and the stone powder are controlled, so that the aggregates in the foam concrete are better and uniformly dispersed, and meanwhile, the aggregates in the foam concrete are better and densely stacked, so that the compactness of the foam concrete is higher, and the later strength of the foam concrete is better improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A foam concrete containing phosphorous slag is characterized in that: the concrete is prepared from concrete mixture, wherein the concrete mixture comprises the following components in parts by weight:

cement 400-410 parts;

100 portions and 105 portions of phosphorus slag;

40-50 parts of stone powder;

1-3 parts of a foaming agent;

water 120-;

3-5 parts of quicklime;

1-2 parts of calcium borate;

0.3-0.7 part of ferric sulfate.

2. The foamed concrete containing phosphorous slag of claim 1, wherein: the concrete mixture also comprises the following components in parts by weight:

0.1-0.5 part of polyethylene glycol.

3. The foamed concrete containing phosphorous slag of claim 1, wherein: the concrete mixture also comprises the following components in parts by weight:

13-16 parts of indium tin oxide;

8-13 parts of zirconium dioxide.

4. The phosphorous slag-containing foamed concrete according to any one of claims 1 to 3, wherein: the foaming agent comprises one or more of calcium carbonate, magnesium carbonate, silicon carbide, aluminum powder and carbon black.

5. The foamed concrete containing phosphorous slag of claim 4, wherein: the foaming agent is prepared from calcium carbonate and aluminum powder in a weight ratio of 1: 2-3 by mass ratio.

6. The phosphorous slag-containing foamed concrete according to any one of claims 1 to 3, wherein: the granularity of the phosphorus slag is 150-200 meshes; the particle size of the stone powder is 300-400 meshes.

7. The foamed concrete containing phosphorous slag of claim 1, wherein: the granularity of the phosphorus slag is 150-170 meshes; the particle size of the stone powder is 300-325 meshes;

0.1-0.5 part of polyethylene glycol;

13-16 parts of indium tin oxide;

8-13 parts of zirconium dioxide.

8. A method for the production of the foamed concrete containing phosphorous slag according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:

9. The method for preparing the foamed concrete containing the phosphorous slag according to claim 8, wherein the method comprises the following steps: and 0.1-0.5 part of polyethylene glycol is also added in the step 2.

10. The method for preparing the foamed concrete containing the phosphorous slag according to claim 8, wherein the method comprises the following steps: 13-16 parts of indium tin oxide and 8-13 parts of zirconium dioxide are also added in the step 2.