Phosphogypsum concrete and preparation method thereof

Abstract

The invention discloses ardealite concrete and a preparation method thereof, the concrete is prepared from the following raw materials in parts by weight: 180-250 parts of water, 400-600 parts of cement, 500-650 parts of sand, 600-700 parts of fine stone, 350-500 parts of rubble and 30-100 parts of ardealite, and the raw materials are fed into a cement stirrer to be stirred. According to the phosphogypsum concrete and the preparation method thereof, phosphogypsum is utilized in the concrete, the use performance of the concrete is improved, the labor intensity of workers is reduced, pumping of a pump truck is smoother, and the production cost is also reduced.

Description

Technical Field

[0001] The invention relates to the field of comprehensive utilization of phosphogypsum, and in particular to phosphogypsum concrete and a preparation method thereof. Background Art

[0002] With the rapid development of industry, industrial by-products such as phosphogypsum have accumulated in large quantities, which not only occupies land resources but also may pollute the environment. Applying phosphogypsum to concrete can not only achieve resource recycling, but also reduce dependence on natural resources, which meets the requirements of sustainable development. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a phosphogypsum concrete and a preparation method thereof.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: The invention discloses phosphogypsum concrete, which comprises the following raw materials in parts by weight: 180-250 parts of water, 400-600 parts of cement, 500-650 parts of sand, 600-700 parts of fine stone, 350-500 parts of coarse stone and 30-100 parts of phosphogypsum, and the raw materials are fed into a cement mixer for stirring.

[0005] As a preferred technical solution of the present invention, the concrete also includes the following raw materials in parts by weight: 400-600 parts of medium stone, 150-250 parts of large stone, 150-250 parts of melon rice, 50-150 parts of admixture, and 5-20 parts of water reducer.

[0006] As a preferred technical solution of the present invention, the sand includes medium sand and fine sand in a ratio of 2:1.

[0007] As a preferred technical solution of the present invention, the water reducer is a polycarboxylic acid water reducer, and the admixture is one or more of fly ash, mineral powder, and volcanic ash.

[0008] As a preferred technical solution of the present invention, the mud content of the sand is less than 1.0%.

[0009] The present invention provides a method for preparing phosphogypsum concrete, comprising the following steps: Step 1: drying and crushing the phosphogypsum to obtain phosphogypsum powder; Step 2: pre-mix and homogenize the large stone and melon rice in a ratio of 1:1 to obtain pre-treated stone; Step 3: pre-mix and homogenize the medium sand and fine sand in a ratio of 2:1 to obtain pre-treated sand; Step 4: Add the water reducing agent to the mixture to be lifted into the cement mixer, and mix the water, cement, pre-treated stone, pre-treated sand, phosphogypsum powder and admixture into the cement mixer for mixing.

[0010] As a preferred technical solution of the present invention, the rotation speed of the cement mixer in step 4 is 50-80 rpm, and the mixing time is 40-80s.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The concrete of the present invention not only utilizes phosphogypsum, but also improves the use performance of the concrete, reduces the labor intensity of workers, makes pumping by pump trucks smoother, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a flow chart of the steps of the method for preparing phosphogypsum concrete. DETAILED DESCRIPTION

[0013] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0014] In the drawings, the same reference numerals all refer to the same components.

[0015] Embodiment 1: The invention provides phosphogypsum concrete, which comprises the following raw materials in parts by weight: 180 parts of water, 400 parts of cement, 500 parts of sand, 600 parts of fine stone, 350 parts of coarse stone and 30 parts of phosphogypsum, and the raw materials are sent into a cement mixer for stirring.

[0016] In this embodiment, the concrete produced by this mix has a 7-day on-site rebound strength result of 24.1 MPa, a 14-day on-site rebound result of 26 MPa, and a 28-day strength result tested by the quality inspection station of 32.3 MPa, meeting the C30 concrete strength standard; the cost of producing concrete by the above mix is ​​3.5% lower than the cost of producing concrete by traditional mix.

[0017] Furthermore, the concrete also includes the following raw materials in parts by weight: 400 parts of medium stone, 150 parts of large stone, 150 parts of melon rice, 50 parts of admixture, and 5 parts of water reducing agent.

[0018] In this embodiment, the concrete produced by adding the above raw materials has a 7-day on-site rebound strength of 30 MPa, a 14-day on-site rebound strength of 35 MPa, and a 28-day strength test result of 36.5 MPa at the quality inspection station, meeting the C35 concrete strength standard.

[0019] Furthermore, the sand includes medium sand and fine sand in a ratio of 2:1.

[0020] Furthermore, the water reducer is a polycarboxylic acid water reducer, and the admixture is one or more of fly ash, mineral powder, and volcanic ash.

[0021] Furthermore, the mud content of the sand is less than 1.0%.

[0022] like Figure 1 As shown, the present invention provides a phosphogypsum concrete and a preparation method thereof, comprising the following steps: Step 1: drying and crushing the phosphogypsum to obtain phosphogypsum powder; Step 2: pre-mix and homogenize the large stone and melon rice in a ratio of 1:1 to obtain pre-treated stone; Step 3: pre-mix and homogenize the medium sand and fine sand in a ratio of 2:1 to obtain pre-treated sand; Step 4: Add the water reducing agent to the mixture to be lifted into the cement mixer, and mix the water, cement, pre-treated stone, pre-treated sand, phosphogypsum powder and admixture into the cement mixer for mixing.

[0023] Furthermore, the rotation speed of the cement mixer in step 4 is 50 rpm, and the mixing time is 40s.

[0024] Specific: a. The raw materials must be high-quality, strong and free of impurities.

[0025] b. The mud content of sand is required to be less than 1.0%. If it does not meet the requirements, it must be cleaned until it meets the requirements.

[0026] c. Due to the limited number of storage bins, in order to meet the operability of mixing sand and gravel materials with different particle sizes, it is required to pre-mix and homogenize the melon stone and large stone in a 1:1 ratio before loading by forklift, and then shovel the homogenized mixture into the designated storage bin of the mixing station; at the same time, it is required to pre-mix and homogenize the coarse sand and fine sand in a 2:1 ratio before loading by forklift.

[0027] d. When producing concrete of this strength grade, measure 5 parts of water reducer and add it to the mixture to be lifted into the mixer.

[0028] e. When producing according to this mix ratio, if the cement and fly ash metering silos are full and burst, the total amount of each batch of concrete can be reduced in the same proportion according to the entire mix ratio until the cement and fly ash silos are just full.

[0029] Embodiment 2: The invention provides phosphogypsum concrete, which comprises the following raw materials in parts by weight: 250 parts of water, 600 parts of cement, 650 parts of sand, 700 parts of fine stone, 500 parts of coarse stone and 100 parts of phosphogypsum, and the raw materials are sent into a cement mixer for stirring.

[0030] In this embodiment, the concrete produced by this mix ratio has a 7-day on-site rebound strength result of 25.2 MPa, a 14-day on-site rebound result of 26.5 MPa, and a 28-day strength result tested by the quality inspection station of 32.9 MPa, meeting the C30 concrete strength standard; the cost of producing concrete by the above mix ratio is 3.8% lower than the cost of producing concrete by the traditional mix ratio.

[0031] Furthermore, the concrete also includes the following raw materials in parts by weight: 600 parts of medium stone, 250 parts of large stone, 250 parts of melon rice, 150 parts of admixture, and 20 parts of water reducing agent.

[0032] In this embodiment, the concrete produced by adding the above raw materials has a 7-day on-site rebound strength of 29.3 MPa, a 14-day on-site rebound strength of 35.6 MPa, and a 28-day strength test result of 36.9 MPa at the quality inspection station, meeting the C35 concrete strength standard.

[0033] Furthermore, the sand includes medium sand and fine sand in a ratio of 2:1.

[0034] Furthermore, the water reducer is a polycarboxylic acid water reducer, and the admixture is one or more of fly ash, mineral powder, and volcanic ash.

[0035] Furthermore, the mud content of the sand is less than 1.0%.

[0036] like Figure 1 As shown, the present invention provides a phosphogypsum concrete and a preparation method thereof, comprising the following steps: Step 1: drying and crushing the phosphogypsum to obtain phosphogypsum powder; Step 2: pre-mix and homogenize the large stone and melon rice in a ratio of 1:1 to obtain pre-treated stone; Step 3: pre-mix and homogenize the medium sand and fine sand in a ratio of 2:1 to obtain pre-treated sand; Step 4: Add the water reducing agent to the mixture to be lifted into the cement mixer, and mix the water, cement, pre-treated stone, pre-treated sand, phosphogypsum powder and admixture into the cement mixer for mixing.

[0037] Furthermore, the rotation speed of the cement mixer in step 4 is 80 rpm, and the mixing time is 80 s.

[0038] Specific: a. The raw materials must be high-quality, strong and free of impurities.

[0039] b. The mud content of sand is required to be less than 1.0%. If it does not meet the requirements, it must be cleaned until it meets the requirements.

[0040] c. Due to the limited number of storage bins, in order to meet the operability of mixing sand and gravel materials with different particle sizes, it is required to pre-mix and homogenize the melon stone and large stone in a 1:1 ratio before loading by forklift, and then shovel the homogenized mixture into the designated storage bin of the mixing station; at the same time, it is required to pre-mix and homogenize the coarse sand and fine sand in a 2:1 ratio before loading by forklift.

[0041] d. When producing concrete of this strength grade, measure 20 parts of water reducer and add it to the mixture to be lifted into the mixer.

[0042] e. When producing according to this mix ratio, if the cement and fly ash metering silos are full and burst, the total amount of each batch of concrete can be reduced in the same proportion according to the entire mix ratio until the cement and fly ash silos are just full.

[0043] Embodiment 3: The invention provides phosphogypsum concrete, which comprises the following raw materials in parts by weight: 215 parts of water, 458 parts of cement, 584 parts of sand, 624 parts of fine stone, 416 parts of coarse stone and 58 parts of phosphogypsum, and the raw materials are sent into a cement mixer for stirring.

[0044] In this embodiment, 3m 3 The concrete cube has a 7-day on-site rebound strength of 26 MPa, a 14-day on-site rebound strength of 26.6 MPa, and a 28-day strength test result at the quality inspection station of 34.5 MPa, which meets the C30 concrete strength standard. 3 The concrete cube has a slump of 220mm, which is 3m thick compared to the 3m thick concrete cube produced by traditional mix. 3 The concrete cube has better slump; the cost of producing concrete with the above ratio is reduced by 7.79% compared with the cost of producing concrete with traditional ratio.

[0045] Furthermore, the concrete also includes the following raw materials in parts by weight: 490 parts of medium stone, 214 parts of large stone, 214 parts of melon rice, 95 parts of admixture, and 7 parts of water reducer.

[0046] In this embodiment, the concrete produced by adding the above raw materials has a 7-day on-site rebound strength of 30.2 MPa, a 14-day on-site rebound strength of 36.7 MPa, and a 28-day strength test result of 37.4 MPa at the quality inspection station, meeting the C35 concrete strength standard.

[0047] Furthermore, the sand includes medium sand and fine sand in a ratio of 2:1.

[0048] Furthermore, the water reducer is a polycarboxylic acid water reducer, and the admixture is one or more of fly ash, mineral powder, and volcanic ash.

[0049] Furthermore, the mud content of the sand is less than 1.0%.

[0050] like Figure 1 As shown, the present invention provides a phosphogypsum concrete and a preparation method thereof, comprising the following steps: Step 1: drying and crushing the phosphogypsum to obtain phosphogypsum powder; Step 2: pre-mix and homogenize the large stone and melon rice in a ratio of 1:1 to obtain pre-treated stone; Step 3: pre-mix and homogenize the medium sand and fine sand in a ratio of 2:1 to obtain pre-treated sand; Step 4: Add the water reducing agent to the mixture to be lifted into the cement mixer, and mix the water, cement, pre-treated stone, pre-treated sand, phosphogypsum powder and admixture into the cement mixer for mixing.

[0051] Furthermore, the rotation speed of the cement mixer in step 4 is 62 rpm, and the mixing time is 60 s.

[0052] Specific: a. The raw materials must be high-quality, strong and free of impurities.

[0053] b. The mud content of sand is required to be less than 1.0%. If it does not meet the requirements, it must be cleaned until it meets the requirements.

[0054] c. Due to the limited number of storage bins, in order to meet the operability of mixing sand and gravel materials with different particle sizes, it is required to pre-mix and homogenize the melon stone and large stone in a 1:1 ratio before loading by forklift, and then shovel the homogenized mixture into the designated storage bin of the mixing station; at the same time, it is required to pre-mix and homogenize the coarse sand and fine sand in a 2:1 ratio before loading by forklift.

[0055] d. When producing concrete of this strength grade, measure 7 parts of water reducer and add it to the mixture to be lifted into the mixer.

[0056] e. When producing according to this mix ratio, if the cement and fly ash metering silos are full and burst, the total amount of each batch of concrete can be reduced in the same proportion according to the entire mix ratio until the cement and fly ash silos are just full.

[0057] The present invention relates to phosphogypsum concrete and a preparation method thereof. The concrete of the present invention not only utilizes phosphogypsum but also improves the use performance of the concrete, reduces the labor intensity of workers, makes pumping by a pump truck smoother, and reduces production costs.

[0058] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A phosphogypsum concrete, characterized in that: The concrete comprises the following raw materials in parts by weight: 180-250 parts of water, 400-600 parts of cement, 500-650 parts of sand, 600-700 parts of fine stone, 350-500 parts of coarse stone, and 30-100 parts of phosphogypsum, and the above raw materials are sent into a cement mixer for mixing.

2. The phosphogypsum concrete according to claim 1, characterized in that: The concrete also includes the following raw materials in parts by weight: 400-600 parts of medium stone, 150-250 parts of large stone, 150-250 parts of melon rice, 50-150 parts of admixture, and 5-20 parts of water reducing agent.

3. The phosphogypsum concrete according to claim 2, characterized in that: The sand includes medium sand and fine sand in a ratio of 2:

1.

4. The phosphogypsum concrete according to claim 3, characterized in that: The water reducer is a polycarboxylate water reducer, and the admixture is one or more of fly ash, mineral powder, and volcanic ash.

5. The phosphogypsum concrete according to claim 1, characterized in that: The sand has a mud content of less than 1.0%.

6. A method for preparing phosphogypsum concrete, characterized in that: The following steps are involved: Step 1: drying and crushing the phosphogypsum to obtain phosphogypsum powder; Step 2: pre-mix and homogenize the large stone and melon rice in a ratio of 1:1 to obtain pre-treated stone; Step 3: pre-mix and homogenize the medium sand and fine sand in a ratio of 2:1 to obtain pre-treated sand; Step 4: Add the water reducing agent to the mixture to be lifted into the cement mixer, and mix the water, cement, pre-treated stone, pre-treated sand, phosphogypsum powder and admixture into the cement mixer for mixing.

7. A method for preparing phosphogypsum concrete according to claim 6, characterized in that: The rotation speed of the cement mixer in step 4 is 50-80 rpm, and the mixing time is 40-80s.

Images