阅读说明：本技术 固废基高铁硫铝酸盐海工胶凝材料及其制备方法与应用 (Solid waste based high-iron sulphoaluminate marine gelled material and preparation method and application thereof ) 是由 王文龙 姚永刚 于目深 张子良 孙德强 蒋稳 李敬伟 王旭江 毛岩鹏 于 2021-09-17 设计创作，主要内容包括：本发明属于资源循环利用产业,涉及固体废弃物的综合利用,具体涉及固废基高铁硫铝酸盐海工胶凝材料及其制备方法与应用。按照质量份数计,包括以下原料：固废基高铁硫铝酸盐水泥熟料70～80份、脱硫石膏5～10份、石灰石尾矿5～10份、钢渣10～20份、减水剂0.15～0.2份、缓凝剂0.05～0.1份、硅灰2～4份。本发明不仅具有快硬、早强、高强、高密实度、高抗渗等特性,特抗海水侵蚀,而且具有优异的抗海水冲刷和抗碳化性能,可有效提高海洋混凝土工程的耐久性寿命。(The invention belongs to the resource recycling industry, relates to comprehensive utilization of solid wastes, and particularly relates to a solid waste based high-iron sulphoaluminate marine gelled material as well as a preparation method and application thereof. The composite material comprises the following raw materials in parts by weight: 70-80 parts of solid waste based high-iron sulphoaluminate cement clinker, 5-10 parts of desulfurized gypsum, 5-10 parts of limestone tailings, 10-20 parts of steel slag, 0.15-0.2 part of water reducing agent, 0.05-0.1 part of retarder and 2-4 parts of silica fume. The invention not only has the characteristics of rapid hardening, early strength, high compactness, high impermeability and the like, is particularly resistant to seawater erosion, but also has excellent seawater scouring resistance and carbonization resistance, and can effectively improve the durability and service life of the marine concrete engineering.)

1. The solid waste based high-iron sulphoaluminate marine gelled material is characterized by comprising the following raw materials in parts by weight:

70-80 parts of solid waste based high-iron sulphoaluminate cement clinker, 5-10 parts of desulfurized gypsum, 5-10 parts of limestone tailings, 10-20 parts of steel slag, 0.15-0.2 part of water reducing agent, 0.05-0.1 part of retarder and 2-4 parts of silica fume.

2. The solid waste based high-iron sulphoaluminate marine gelled material of claim 1, wherein the steel slag is ultra-fine powder; preferably, D of the steel slag ultra-fine powder₅₀<3μm。

3. The solid waste based high-iron sulphoaluminate marine cementing material of claim 1, wherein the high-iron sulphoaluminate cement clinker is prepared by calcining steel slag, desulfurized gypsum, aluminum ash, coal gangue and limestone tailings;

preferably, the chemical components in the high-iron sulphoaluminate cement clinker comprise, by mass, 37-40 parts of CaO and Al₂O₃25 to 27 parts of Fe₂O₃7 to 9 parts of SiO₂6 to 8 portions of SO₃15-18 parts.

4. The solid waste-based high-iron sulphoaluminate marine gelled material of claim 1, wherein the specific surface area of the high-iron sulphoaluminate cement clinker is not less than 300m²/Kg；

Or the specific surface area of the desulfurized gypsum is not less than 300m²/Kg；

Or the specific surface area of the limestone tailings is not less than 300m²/Kg。

5. The solid waste based high-iron sulphoaluminate marine gelled material of claim 1, wherein the retarder is sodium gluconate;

or the water reducing agent is a polycarboxylic acid water reducing agent.

6. A preparation method of the solid waste based high-iron sulphoaluminate marine gelled material as claimed in any one of claims 1 to 5, which is characterized in that the solid waste based high-iron sulphoaluminate cement clinker, the desulfurized gypsum, the limestone tailings and the steel slag are uniformly mixed to obtain a mixture, and the mixture is mixed with the silica fume, the retarder and the water reducing agent to obtain the solid waste based high-iron sulphoaluminate marine gelled material.

7. The method for preparing solid waste based high-iron sulphoaluminate marine gelled material as claimed in claim 6, wherein the steel slag is subjected to supersonic steam grinding to form ultrafine powder.

8. The method for preparing solid waste based high-iron sulphoaluminate marine gelled material as claimed in claim 6Characterized in that the specific surface area of the mixture is not less than 350m²/Kg。

9. The method for preparing solid waste based high-iron sulphoaluminate marine gelled material as claimed in claim 6, wherein the solid waste based high-iron sulphoaluminate cement clinker, the desulfurized gypsum and the limestone tailings are ground respectively.

10. The application of the solid waste based high-iron sulphoaluminate marine gelled material as claimed in any one of claims 1 to 5 in construction of marine engineering buildings.

Technical Field

The invention belongs to the resource recycling industry, relates to comprehensive utilization of solid wastes, and particularly relates to a solid waste based high-iron sulphoaluminate marine gelled material as well as a preparation method and application thereof.

Background

The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.

The construction of marine concrete engineering mainly adopts portland cement, but after the portland cement is subjected to seawater erosion, sea wave scouring and carbonization for a long time in a marine environment, the portland cement is easy to deteriorate and destroy, so that the service life of the portland cement is far lower than the design life, and serious waste of resources is caused.

As the sulphoaluminate cement has the characteristics of rapid hydration reaction, early strength, high freezing resistance, high compactness, high impermeability and the like, partial researchers develop related researches on the application of the sulphoaluminate cement as marine cement, and the researches find that the sulphoaluminate cement has excellent freezing resistance, seawater erosion resistance and other characteristics compared with a silicate cement-based marine cementing material, is suitable for being used as the marine cement, but the pH value of a hydration liquid phase is lower due to the special mineral composition, so that the carbonization resistance of the material is insufficient, and the durability life of a marine engineering building is seriously influenced.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to provide a solid waste based high-iron sulphoaluminate marine gelled material, a preparation method and an application thereof.

In order to achieve the purpose, the technical scheme of the invention is as follows:

on one hand, the solid waste based high-iron sulphoaluminate marine gelled material comprises the following raw materials in parts by weight:

70-80 parts of solid waste based high-iron sulphoaluminate cement clinker, 5-10 parts of desulfurized gypsum, 5-10 parts of limestone tailings, 10-20 parts of steel slag, 0.15-0.2 part of water reducing agent, 0.05-0.1 part of retarder and 2-4 parts of silica fume.

The high-iron sulphoaluminate cement clinker and the common sulphoaluminate cement clinker mainly comprise: fe in high-iron sulphoaluminate cement clinker₂O₃The content of (B) is 5-12 wt%, and the content of Fe in the ordinary sulphoaluminate cement clinker₂O₃The content of the high-iron sulphoaluminate cement clinker is only 1-3 wt%, so that the difference of the iron phase mineral content in the two clinkers is further caused, wherein the iron phase content in the high-iron sulphoaluminate cement clinker is 15-30 wt%, while the iron phase content in the common sulphoaluminate cement clinker is only 3-6 wt%, which is far lower than the iron phase content in the high-iron sulphoaluminate cement clinker. While the iron phase can generate the iron glue and the calcium hydroxide in the hydration process, the iron glue has the gelling property, can effectively enhance the compactness of the hydrated slurry and can greatly improve the impermeability, erosion resistance and scouring resistance of the hydrated slurry, the calcium hydroxide can improve the pH value of the liquid phase of the hydrated slurry, can effectively improve the carbonization resistance of the hydrated slurry and protect the protective film on the surface of the steel bar in the concrete so as to improve the Cl resistance of the hydrated slurry^-The ions have electrochemical corrosion effect, so that the high-iron sulphoaluminate cement with higher iron phase mineral content is more suitable for being used as a marine cementing material than the common sulphoaluminate cement.

Research shows that the solid waste based high-iron sulphoaluminate cement clinker has better mechanical strength advantage than the common high-iron sulphoaluminate cement clinker, is more beneficial to the preparation of the marine cementing material, and particularly has more excellent performance when the solid waste based high-iron sulphoaluminate cement clinker which is fired by taking steel slag, desulfurized gypsum, aluminum ash, coal gangue and limestone tailings as raw materials is used for preparing the marine cementing material.

The invention adopts the desulfurized gypsum to adjust the setting time, and can provide sufficient sulfate radicals for the hydration of calcium sulphoaluminate minerals in the solid waste base high-iron sulphoaluminate cement clinker, promote the formation of hydration products, namely ettringite, and further improve the mechanical strength of slurry, so that the addition of the desulfurized gypsum can simultaneously improve the mechanical property and the workability of the solid waste base high-iron sulphoaluminate marine gelled material. The limestone tailings adopted by the invention can play a certain role in stabilizing hydration product ettringite in the later stage of hydration, and can promote the increase of later-stage strength. The steel slag adopted by the invention is waste slag discharged by metallurgy, has mineral composition similar to portland cement, mainly comprises dicalcium silicate, tricalcium silicate and the like, after the steel slag is doped into solid waste high-iron sulphoaluminate cement clinker, hydrated dicalcium silicate and tricalcium silicate in the steel slag can generate hydrated calcium silicate gel and calcium hydroxide, and the calcium silicate gel generated by hydration has the gelling property, so that the compactness of solid waste high-iron sulphoaluminate cement slurry can be improved, the later strength of the slurry can be promoted to be increased, and the impermeability of the hydrated slurry can be improved; the calcium hydroxide generated by hydration can improve the pH value of the liquid phase of the cement hydrated slurry, effectively improve the carbonization resistance of the hydrated slurry and protect the protective film on the surface of the steel bar in the concrete so as to improve the Cl resistance of the hydrated slurry^-Ion electrochemical corrosion.

In addition, because the steel slag contains a certain amount of free CaO, the steel slag product often has the problem of volume stability, which influences the long-term stable use of the steel slag product. When the steel slag is adopted, the steel slag can be granules, powder, ultrafine powder and the like, and when the ultrafine powder is adopted, the free CaO in the steel slag is favorably released, and the calcium hydroxide is generated by hydration before the steel slag is made into a building material, so that the problem of volume stability of a steel slag product can be solved.

On the other hand, the preparation method of the solid waste based high-iron sulphoaluminate marine cementing material comprises the steps of uniformly mixing the solid waste based high-iron sulphoaluminate cement clinker, the desulfurized gypsum, the limestone tailings and the steel slag to obtain a mixture, and mixing the mixture with the silica fume, the retarder and the water reducer to obtain the solid waste based high-iron sulphoaluminate cementing material.

In a third aspect, the application of the solid waste based high-iron sulphoaluminate marine gelled material in construction of marine engineering buildings.

The invention has the beneficial effects that:

the solid waste based high-iron sulphoaluminate marine cementing material not only has the characteristics of rapid hardening, early strength, high impermeability, high erosion resistance and the like, but also has excellent sea wave scouring resistance and carbonization resistance due to the high iron phase content in the solid waste based high-iron sulphoaluminate cement clinker and the addition of steel slag superfine powder, and can effectively improve the durability and the service life of marine concrete engineering. The solid waste based high-iron sulphoaluminate marine gelled material is mainly prepared from industrial solid waste, so that the manufacturing cost of the material is effectively reduced, the pollution of the industrial solid waste to the environment is reduced, and the reduction, the recycling and the high-value utilization of the industrial solid waste are realized.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

FIG. 1 is a process flow chart of the preparation of solid waste based high iron sulphate marine gelled material (solid waste based marine cement) according to the embodiment of the invention.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

In view of the problem of insufficient durability of the existing cementing material for marine concrete engineering after long-term sea salt erosion, sea wave scouring and carbonization, the invention provides a solid waste based high-iron sulphoaluminate marine cementing material, and a preparation method and application thereof.

The invention provides a solid waste based high-iron sulphoaluminate marine gelled material, which comprises the following raw materials in parts by weight:

70-80 parts of solid waste based high-iron sulphoaluminate cement clinker, 5-10 parts of desulfurized gypsum, 5-10 parts of limestone tailings, 10-20 parts of steel slag, 0.15-0.2 part of water reducing agent, 0.05-0.1 part of retarder and 2-4 parts of silica fume.

The invention adopts the solid waste high-iron sulphoaluminate cement clinker, which not only can effectively improve the carbonization resistance of the hydrated slurry and protect the protective film on the surface of the steel bar in the concrete, but also can improve the Cl resistance of the hydrated slurry^-The ionic electrochemical corrosion effect is achieved, the mechanical strength is better, and the obtained marine cementing material has excellent seawater scouring resistance and carbonization resistance.

The invention adopts the desulfurized gypsum to ensure that the gel material has good mechanical property and good workability. The invention adopts limestone tailings to further improve the mechanical property of the gel material. The steel slag adopted by the invention can effectively improve the carbonization resistance of the hydrated slurry and protect the protective film on the surface of the steel bar in the concrete so as to improve the Cl resistance of the hydrated slurry^-Ion electrochemical corrosion.

When the steel slag is adopted, the steel slag can be granules, powder, superfine powder and the like, and because the steel slag contains a certain amount of free CaO, the steel slag product often has the problem of volume stability, so that the long-term stable use of the steel slag product is influenced. In some examples of this embodiment, the steel slag is ultra-fine powder. The superfine powder is prepared by mechanically grinding materials to obtain superfine powder (powder with particle size less than 10 μmThe body is called ultra-micro powder). When the steel slag ultrafine powder is adopted, free CaO in the steel slag is released, and the steel slag is hydrated to generate calcium hydroxide before being made into a building material, so that the problem of the volume stability of the steel slag is solved. When the median particle diameter (D) of the steel slag ultra-fine powder is₅₀)<When the particle size is 3 μm, the effect is better.

In some examples of this embodiment, the high iron sulphoaluminate cement clinker is produced by calcining steel slag, desulphurised gypsum, aluminium ash, coal gangue and limestone tailings. The calcination temperature is 1200-1250 ℃.

In one or more embodiments, the chemical components in the high-iron sulphoaluminate cement clinker comprise, by mass, 37-40 parts of CaO and Al₂O₃25 to 27 parts of Fe₂O₃7 to 9 parts of SiO₂6 to 8 portions of SO₃15-18 parts.

In some examples of this embodiment, the high iron sulphoaluminate cement clinker has a specific surface area of not less than 300m²/Kg。

The desulfurization gypsum is a byproduct of power plant desulfurization and is industrial solid waste; in some examples of this embodiment, the desulfurized gypsum has a specific surface area of not less than 300m²/Kg。

The limestone tailings are byproducts after mineral processing and are industrial solid wastes; in some examples of this embodiment, the limestone tailings have a specific surface area of not less than 300m²/Kg。

In some embodiments of this embodiment, the retarder is sodium gluconate.

In some embodiments of this embodiment, the water reducer is a polycarboxylic acid water reducer.

The invention also provides a preparation method of the solid waste based high-iron sulphoaluminate marine cementing material, which comprises the steps of uniformly mixing the solid waste based high-iron sulphoaluminate cement clinker, the desulfurized gypsum, the limestone tailings and the steel slag to obtain a mixture, and mixing the mixture with the silica fume, the retarder and the water reducer to obtain the solid waste based high-iron sulphoaluminate marine cementing material.

In order to improve the activity of the steel slag, the steel slag needs to be processed into superfine powder, the currently common modes for improving the activity of the steel slag mainly comprise mechanical activation and thermal activation, the traditional mechanical activation mainly refers to ball milling, the activation mode is simpler, but energy consumption is higher, powder equipment is easy to consume, and the thermal activation is more energy consumption, in some embodiments of the embodiment, the steel slag is subjected to supersonic steam grinding to form the superfine powder. The mode has obvious energy-saving advantages, and the ground particles are smaller and more uniform, and the activity is higher.

In some examples of this embodiment, the specific surface area of the mix is not less than 350m²/Kg。

In some examples of this embodiment, the solid waste-based high-iron sulphoaluminate cement clinker, the desulfurized gypsum and the limestone tailings are ground separately. The grinding mode is ball milling.

More specifically, the steps are as follows:

[1] crushing and grinding: respectively crushing and drying each block raw material, and then grinding for later use;

[2] primary mixing: mixing the ground solid waste base high-iron sulphoaluminate cement clinker, the desulfurized gypsum, the limestone tailings and the steel slag according to a proportion, and then carrying out ball milling homogenization by using a ball mill;

[3] and (3) secondary mixing: and ball-milling and homogenizing the mixture, the silica fume, the retarder and the water reducing agent which are subjected to primary mixing in a ball mill according to a proportion to prepare the solid waste based high-iron sulphoaluminate marine gelled material.

The third embodiment of the invention provides an application of the solid waste based high-iron sulphoaluminate marine cementing material in construction of marine engineering buildings.

In order to make the technical solution of the present invention more clearly understood by those skilled in the art, the technical solution of the present invention will be described in detail below with reference to specific examples and comparative examples.

In the following examples, the silica fume was commercial industrial silica fume, the retarder was commercial industrial sodium gluconate, and the water reducing agent was a commercial polycarboxylic acid water reducing agent.

The solid waste based high-iron sulphoaluminate cement clinker used in the following examples is prepared from steel slag, desulfurized gypsum,The aluminum ash, the coal gangue and the limestone tailings are calcined in a cement rotary kiln at 1220 ℃ in a synergetic and complementary mode. The proportions of the steel slag, the desulfurized gypsum, the aluminum ash, the coal gangue and the limestone tailings are respectively 17.14 parts, 13.71 parts, 34.27 parts, 4.03 parts and 30.85 parts by mass. The prepared solid waste based high-iron sulphoaluminate cement clinker comprises the following chemical components: 39.73 portions of CaO and Al₂O₃26.59 portions of Fe₂O₃8.94 portions of SiO₂8 parts of SO₃16.74 portions.

Example 1

A solid waste based high-iron sulphoaluminate marine gelled material is composed of the following raw materials in parts by weight: 80 parts of solid waste base high-iron sulphoaluminate cement clinker; 5 parts of desulfurized gypsum; 5 parts of limestone tailings; 10 parts of steel slag; 0.15 part of a water reducing agent; 0.05 part of retarder; 4 parts of silica fume.

The preparation method of the solid waste based high-iron sulphoaluminate marine gelled material is shown in figure 1, and comprises the following specific steps:

1. crushing and ball milling the solid waste base high-iron sulphoaluminate cement clinker until the specific surface area is 300m²and/Kg for standby.

Drying the desulfurized gypsum, and ball-milling until the specific surface area is 300m²and/Kg for standby.

Crushing and ball-milling limestone tailings until the specific surface area is 300m²and/Kg for standby.

Crushing the steel slag, then carrying out supersonic steam crushing and grinding to D₅₀2.8 μm for use.

2. Mixing the crushed and ground solid waste base high-iron sulphoaluminate cement clinker, the desulfurized gypsum, the limestone tailings and the steel slag according to the proportion, and performing ball milling and homogenization in a ball mill to prepare a primary mixture (the specific surface area is 350 m)²/Kg)。

3. Adding the water reducing agent, the retarder and the silica fume into the primary mixture according to the proportion, continuing ball milling and homogenizing to prepare the solid waste high-iron sulphoaluminate marine gelled material (the specific surface area is 400 m)²Perkg, solid waste base marine cement for short).

Example 2

A solid waste based high-iron sulphoaluminate marine gelled material is composed of the following raw materials in parts by weight: 75 parts of solid waste base high-iron sulphoaluminate cement clinker; 5 parts of desulfurized gypsum; 5 parts of limestone tailings; 15 parts of steel slag; 0.17 part of a water reducing agent; 0.07 part of retarder; 3 parts of silica fume.

The preparation method of the solid waste based high-iron sulphoaluminate marine gelled material is shown in figure 1, and comprises the following specific steps:

1. crushing and ball milling the solid waste base high-iron sulphoaluminate cement clinker until the specific surface area is 300m²and/Kg for standby.

Drying the desulfurized gypsum, and ball-milling until the specific surface area is 300m²and/Kg for standby.

Crushing and ball-milling limestone tailings until the specific surface area is 300m²and/Kg for standby.

Crushing the steel slag, then carrying out supersonic steam crushing and grinding to D₅₀2.8 μm for use.

2. Mixing the crushed and ground solid waste base high-iron sulphoaluminate cement clinker, the desulfurized gypsum, the limestone tailings and the steel slag according to the proportion, and performing ball milling and homogenization in a ball mill to prepare a primary mixture (the specific surface area is 350 m)²/Kg)。

3. Adding the water reducing agent, the retarder and the silica fume into the primary mixture according to the proportion, continuing ball milling and homogenizing to prepare the solid waste high-iron sulphoaluminate marine gelled material (the specific surface area is 400 m)²/Kg)；

Example 3

A solid waste based high-iron sulphoaluminate marine gelled material is composed of the following raw materials in parts by weight: 70 parts of solid waste base high-iron sulphoaluminate cement clinker; 5 parts of desulfurized gypsum; 5 parts of limestone tailings; 20 parts of steel slag; 0.2 part of a water reducing agent; 0.1 part of retarder; and 2 parts of silica fume.

The preparation method of the solid waste based high-iron sulphoaluminate marine gelled material is shown in figure 1, and comprises the following specific steps:

1. crushing and ball milling the solid waste base high-iron sulphoaluminate cement clinker until the specific surface area is 300m²and/Kg for standby.

Drying the desulfurized gypsum, and ball-milling the desulfurized gypsum to a specific surfaceProduct of 300m²and/Kg for standby.

Crushing and ball-milling limestone tailings until the specific surface area is 300m²and/Kg for standby.

Crushing the steel slag, then carrying out supersonic steam crushing and grinding to D₅₀2.8 μm for use.

2. Mixing the crushed and ground solid waste base high-iron sulphoaluminate cement clinker, the desulfurized gypsum, the limestone tailings and the steel slag according to the proportion, and performing ball milling and homogenization in a ball mill to prepare a primary mixture (the specific surface area is 350 m)²/Kg)。

3. Adding the water reducing agent, the retarder and the silica fume into the primary mixture according to the proportion, continuing ball milling and homogenizing to prepare the solid waste high-iron sulphoaluminate marine gelled material (the specific surface area is 400 m)²/Kg)。

Example 4

A solid waste based high-iron sulphoaluminate marine gelled material is composed of the following raw materials in parts by weight: 75 parts of solid waste base high-iron sulphoaluminate cement clinker; 10 parts of desulfurized gypsum; 5 parts of limestone tailings; 10 parts of steel slag; 0.15 part of a water reducing agent; 0.05 part of retarder; 3 parts of silica fume.

The preparation method of the solid waste based high-iron sulphoaluminate marine gelled material is shown in figure 1, and comprises the following specific steps:

1. crushing and ball milling the solid waste base high-iron sulphoaluminate cement clinker until the specific surface area is 300m²and/Kg for standby.

Drying the desulfurized gypsum, and ball-milling until the specific surface area is 300m²and/Kg for standby.

Crushing and ball-milling limestone tailings until the specific surface area is 300m²and/Kg for standby.

Crushing the steel slag, then carrying out supersonic steam crushing and grinding to D₅₀2.8 μm for use.

2. Mixing the crushed and ground solid waste base high-iron sulphoaluminate cement clinker, the desulfurized gypsum, the limestone tailings and the steel slag according to the proportion, and performing ball milling and homogenization in a ball mill to prepare a primary mixture (the specific surface area is 350 m)²/Kg)。

3. Mixing the water reducing agentAdding the retarder and the silica fume into the primary mixture according to the proportion, continuing ball milling and homogenizing to prepare the solid waste high-iron sulphoaluminate marine gelled material (the specific surface area is 400 m)²/Kg)。

Example 5

A solid waste based high-iron sulphoaluminate marine gelled material is composed of the following raw materials in parts by weight: 75 parts of solid waste base high-iron sulphoaluminate cement clinker; 5 parts of desulfurized gypsum; 10 parts of limestone tailings; 10 parts of steel slag; 0.15 part of a water reducing agent; 0.05 part of retarder; 3 parts of silica fume;

the preparation method of the solid waste based high-iron sulphoaluminate marine gelled material is shown in figure 1, and comprises the following specific steps:

1. crushing and ball milling the solid waste base high-iron sulphoaluminate cement clinker until the specific surface area is 300m²and/Kg for standby.

Drying the desulfurized gypsum, and ball-milling until the specific surface area is 300m²and/Kg for standby.

Crushing and ball-milling limestone tailings until the specific surface area is 300m²and/Kg for standby.

Crushing the steel slag, then carrying out supersonic steam crushing and grinding to D₅₀2.8 μm for use.

2. Mixing the crushed and ground solid waste base high-iron sulphoaluminate cement clinker, the desulfurized gypsum, the limestone tailings and the steel slag according to the proportion, and performing ball milling and homogenization in a ball mill to prepare a primary mixture (the specific surface area is 350 m)²/Kg)。

3. Adding the water reducing agent, the retarder and the silica fume into the primary mixture according to the proportion, continuing ball milling and homogenizing to prepare the solid waste high-iron sulphoaluminate marine cement (the specific surface area is 400 m)²/Kg)；

Comparative example 1

The solid waste based high-iron sulphoaluminate cement clinker in the embodiment 2 is changed into the ordinary Portland cement clinker, and other raw materials and steps are not changed.

Comparative example 2

The solid waste based high-iron sulphoaluminate cement clinker in the embodiment 2 is changed into the common sulphoaluminate cement clinker, and other raw materials and steps are not changed.

Comparative example 3

The solid waste base high-iron sulphoaluminate cement clinker in the embodiment 2 is changed into the common high-iron sulphoaluminate cement clinker, and other raw materials and steps are not changed.

The mechanical strength and durability of the comparative examples of the above examples are shown in tables 1 to 2.

TABLE 1 comparison of mechanical Strength of examples and comparative examples

TABLE 2 comparison of durability Performance between examples and comparative examples

The combination of the tables 1 and 2 shows that the solid waste based high-iron sulphoaluminate marine gelled material prepared by the method has excellent performance.

Among them, as can be seen from table 1, the prepared solid waste based high-iron sulphoaluminate marine gelled material (examples 1-5) not only has rapid increase of early strength (the compressive strength of 3d is over 45MPa), but also has continuous increase of later strength (the compressive strength of 28d is over 53MPa), the mechanical strength of each age period is over the mechanical strength of common Portland cement (comparative example 1), common sulphoaluminate cement (comparative example 2) and common high-iron sulphoaluminate cement (comparative example 3) in the corresponding age period, the mechanical property is extremely excellent, and the construction requirement of marine concrete can be met.

As can be seen from Table 2, the prepared solid waste based high iron sulphoaluminate marine gelled material (examples 1-5) is resistant to 10% NaSO₄Solution and 10% MgCl₂The corrosion coefficients of the solution exceed 1.1, are much higher than that of ordinary portland cement (comparative example 1), are higher than that of ordinary sulphoaluminate cement (comparative example 2) and ordinary high-iron sulphoaluminate cement (comparative example 3), and show excellent chemical corrosion resistance; the prepared solid waste based high-iron sulphoaluminate marine gelled material (examples 1-5) and 28d mortar thereofThe abrasion loss is lower than that of ordinary portland cement (comparative example 1), and the abrasion resistance is obviously improved compared with that of ordinary sulphoaluminate cement (comparative example 2) and ordinary high-iron sulphoaluminate cement (comparative example 3); the pH value of the 28d mortar extract of the prepared solid waste based high-iron sulphoaluminate marine gelled material (examples 1-5) is slightly lower than that of ordinary portland cement (comparative example 1), but is obviously higher than that of ordinary sulphoaluminate cement (comparative example 2) and ordinary high-iron sulphoaluminate cement (comparative example 3), and the prepared solid waste based high-iron sulphoaluminate marine gelled material has excellent potential carbonization resistance.

In conclusion, the solid waste based high-iron sulphoaluminate marine gelled material prepared by the method is feasible, the prepared solid waste based high-iron sulphoaluminate marine gelled material is low in cost and extremely excellent in performance, the early strength of the marine gelled material is rapidly increased, the later strength of the marine gelled material is continuously improved, and the chemical erosion resistance, the wear resistance and the carbonization resistance of the marine gelled material are obviously improved compared with those of common sulphoaluminate cement and common high-iron sulphoaluminate cement.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.