High early strength cementing material prepared by red mud compound recovery powder based on intermittent mixing equipment and preparation method thereof

Abstract

The present application relates to the research field of solid waste resource utilization, in particular to a kind of high early strength cementing material prepared by mixing red mud and recycling powder based on intermittent mixing equipment and a preparation method thereof, comprising the following components by mass fraction: red mud 30-60 parts, mixing plant recycling powder 30-60 parts, catalyst 1-5 parts. The high early strength cementing material prepared by mixing red mud and recycling powder according to the present application is heated by open fire of mixing plant, and the red mud and recycling powder are carbon strengthened and high-temperature activated in the heating roller using the industrial waste heat of mixing plant. Then, the carbon strengthened and high-temperature activated red mud, recycling powder and catalyst are added into a ball mill in proportion for sufficient ball milling to obtain high-strength cementing material. The strength grade of the cementing material is not less than 40 MPa. The present application makes full use of red mud, mixing plant recycling powder and other materials, thereby achieving the effects of energy saving and emission reduction, low carbon environmental protection and resource recycling.

Description

Technical Field

[0001] The present invention belongs to the research field of solid waste resource utilization, and specifically relates to a high-early-strength gelling material prepared by compounding and recycling red mud powder based on an intermittent mixing device, and a preparation method thereof. Background Art

[0002] Industrialization is a crucial global development, generating a significant amount of waste materials. Industrial production processes generate industrial solid waste, particularly red mud. Mixing plant equipment also produces significant amounts of dust during production. If not properly handled, these wastes can pollute the environment. To address this issue, a series of environmental measures have been implemented, including optimizing dust recovery and emission systems, improving machinery utilization and management, and implementing energy-saving and emission-reduction measures to reduce solid waste generation and its negative environmental impact. Therefore, the efficient utilization and disposal of red mud solid waste and recycled dust from mixing plants is crucial.

[0003] At present, for red mud and mixing equipment recycled powder, the core of solid waste resource reuse lies in "transformation", that is, transforming waste into useful resources after processing, which not only helps to reduce the consumption of natural resources, but also reduces the environmental burden of waste treatment. However, for red mud industrial solid waste materials, the current main method is storage, which occupies a large amount of land resources; red mud can be used as a raw material for the production of new wall materials, but its low hardness, easy water absorption, easy mold, poor environmental protection and high cost limit the widespread application of new red mud wall materials; traditional asphalt mixtures need to be processed and produced at a high temperature of about 160°C, and the production of this cementitious material requires carbon strengthening and high-temperature activation. The additional carbon strengthening and high-temperature activation require a large amount of fuel, electricity and other energy, which will not only increase production costs, but also be a waste of energy. The high-temperature waste heat of the mixing equipment heating system can be used here. In the production of cementitious materials, energy consumption is saved; in addition, asphalt mixing equipment has a large amount of dust and recycled powder pollution, which seriously pollutes the environment. Current research on the utilization of recycled powder from mixing equipment is mainly used in road base materials or to partially replace mineral powder in asphalt mixtures. Most of the current existing technologies separate red mud and recycled powder from mixing plants for resource utilization, and fail to fully utilize red mud and recycled powder from mixing plants. There are very few studies on the comprehensive and coordinated utilization of red mud and recycled powder. Although there is a certain technical foundation, the current technical products do not have high early strength characteristics, and the coordinated utilization of red mud and recycled powder still needs to be improved.

[0004] The resource utilization of red mud and dust generated by mixing plants is a significant problem. Existing technologies have not yet solved the problem of recycling powder from mixing plants and the large-scale utilization of red mud. Therefore, there is an urgent need to find a high-early-strength cementitious material prepared by compounding recycled powder of red mud based on intermittent mixing equipment. Summary of the Invention

[0005] Based on the problems existing in the prior art, the present invention proposes a high-early-strength cementitious material prepared by compounding red mud with recycled powder based on intermittent mixing equipment and a preparation method thereof, which can realize the coordinated regulation and comprehensive utilization of recycled powder and red mud, achieve the purpose of solid waste resource utilization, effectively replace cement cementitious materials, have the characteristics of low-carbon production and high-strength performance, and adapt to the current trend of technological development.

[0006] The technical solution adopted by the present invention is:

[0007] A high early strength cementitious material prepared from red mud compounded recycled powder using an intermittent mixing device, comprising the following components in parts by mass:

[0008] 30-60 parts of red mud;

[0009] 30-60 parts of recycled powder from mixing plant;

[0010] 1-5 parts of catalyst;

[0011] The red mud and the recycled powder from the mixing plant are put into the heating drum of the mixing plant in proportion, and carbon strengthening and high-temperature activation treatments are carried out in sequence using the industrial waste heat of the mixing plant. Then, the red mud, the recycled powder from the mixing plant and the catalyst after carbon strengthening and high-temperature activation treatment are put into a ball mill together and fully ball-milled to obtain a high-early-strength cementitious material prepared from the red mud composite recycled powder based on the intermittent mixing equipment.

[0012] The carbon strengthening temperature is 130°C-170°C, and the high-temperature activation temperature is 300°C-400°C.

[0013] Carbon strengthening technology: During the carbon strengthening process at 130℃-170℃, the main products of red mud are alkali-activated cementitious materials and geopolymer active components, which accelerates the reaction between red mud and recycled powder and improves the early strength of the red mud recycled powder cementitious materials. On the other hand, the recycled powder generates carbonized products with other materials during the carbon strengthening process, and through chemical reactions, a cementitious material with higher and better performance is obtained.

[0014] High-temperature activation technology: During the carbon strengthening process at 300℃-400℃, the active components in the recycled powder from the mixing plant are stimulated and enhanced. The cementitious material prepared by mixing the high-temperature activated red mud with the recycled powder has high compressive strength and durability, which can meet the needs of different construction projects.

[0015] The mixing plant recycling powder is treated by carbon strengthening and high-temperature activation. In the carbon strengthening process, CO2 reacts with the active ingredients in the mixing plant recycling powder to form carbonized products. In the high-temperature activation process, part of the mixing plant recycling powder is converted into mineral admixtures in microcrystalline form. The carbonized products, mineral admixtures in microcrystalline form, and calcium hydroxide and hydrated calcium silicate in the mixing plant recycling powder react to form carbonized product cementitious active components. The content of the carbonized product cementitious active components is not less than 23%, and the content of the carbonized products is not less than 36%.

[0016] The red mud is treated by carbon strengthening and high-temperature activation. In the carbon strengthening process, silicon and calcium in the red mud are converted into calcium silicate and calcium carbonate. In the high-temperature activation process, they react with other ingredients to obtain calcium silicate and calcium carbonate as the main components. The total mass of the active components of CaSiO3 and CaCO3 is not more than 42.3%.

[0017] Further, after the red mud is treated by mixing plant industrial waste heat carbon strengthening and high-temperature activation, a catalyst is added, and the water content after refinement in a ball mill is not more than 0.5%, and the density is not more than 2.50 g / cm 3 .

[0018] Further, the particle size and mass ratio of the mixing plant recycling powder are as follows:

[0019] 0.125 mm-0.25 mm particle size screening: 80%-100%;

[0020] 0.065 mm-0.125 mm particle size screening: 80%-60%;

[0021] 0.020 mm-0.065 mm particle size screening: 60%-50%.

[0022] Further, the catalyst includes a dispersant, a surfactant, and an activity enhancer, and the mass fraction components are as follows:

[0023] Dispersant 1-4 parts;

[0024] Surfactant 1-3 parts;

[0025] Activity enhancer 4-8 parts.

[0026] The dispersant can significantly improve the fluidity of the cementitious material, promote the formation of cementitious bodies and the reaction of high-efficiency active powder, thereby enhancing the strength and durability of the cementitious material and enabling the cementitious material to achieve a higher strength level.

[0027] The surfactant can accelerate the hardening process of the cementitious material, enable it to reach the expected strength faster, and help improve its workability, reduce shrinkage, and improve chemical stability.

[0028] The active enhancer can improve the microstructure of the cementitious material, increase its density and uniformity, and enhance the early strength of the cementitious material.

[0029] Furthermore, the dispersant is one or both of sulfonated ketone-aldehyde condensate and naphthalenesulfonate formaldehyde condensate.

[0030] Furthermore, the surfactant is one or both of silicone resin and sodium dodecylbenzenesulfonate.

[0031] Furthermore, the activity enhancer is one or both of mercaptopropyltriethoxysilane and diethylamine phosphate.

[0032] The present invention also provides a method for preparing a high-early-strength gelling material prepared by using the red mud compounded recycled powder based on the intermittent mixing equipment, comprising the following steps:

[0033] S1. First, calculate the production of recycled powder in the mixing plant per unit time, and calculate the production volume by mass;

[0034] S2. Carbon Enhancement: Based on the recycled powder from the mixing plant produced per unit time, red mud and recycled powder from the mixing plant are placed in a heating drum of a batch mixing equipment in a proportional manner and carbon enhanced using waste heat for 10-20 minutes at a temperature of 130°C-170°C. The carbonized product generated by the reaction has a content of no less than 23% of the active components of the cementitious material and a content of no less than 36% of the carbonized product.

[0035] S3. High-temperature activation: The carbon-enhanced recycled fines from the mixing plant and red mud are subjected to high-temperature activation for 20-25 minutes at a temperature of 300°C-400°C. The silicon and calcium in the red mud are converted into calcium silicate and calcium carbonate by carbon-enhanced activation. After high-temperature activation, the silicon and calcium react with other components to produce calcium silicate and calcium carbonate as the main components, with the combined active components CaSiO3 and CaCO3 comprising no more than 42.3% by weight. The carbon-enhanced and high-temperature activated red mud and recycled fines from the mixing plant are collected in a recovery bin.

[0036] S4. Preparation of cementitious material: Add carbon-strengthened and high-temperature activated red mud, recycled powder from the mixing plant, and a catalyst in appropriate proportions to a ball mill and fully ball-mill for 25-35 minutes at a rotation speed of 20-35 rpm to obtain a high-early-strength cementitious material using red mud compounded with recycled powder using an intermittent mixing equipment.

[0037] The beneficial effects produced by the present invention include:

[0038] (1) The present invention discloses a high early strength cementitious material prepared by compounding red mud with recycled powder based on an intermittent mixing device and a preparation method thereof. The red mud and recycled powder are carbon-enhanced and activated at high temperature by utilizing industrial waste heat from a mixing plant. No additional high-temperature heating is required and the red mud and recycled powder can be obtained by only sufficient ball milling in a ball mill. This is a low-carbon and environmentally friendly cementitious material production method, and the early strength index is achieved, meeting the characteristics of a high early strength cementitious material.

[0039] (2) Effectively replace cement binder materials and possess high strength characteristics, with a 28-day compressive strength of not less than 40 MPa;

[0040] (3) It effectively solved the problem of large-scale utilization of recycled powder from mixing plants and industrial solid waste red mud, reducing the pollution of waste to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a preparation flow chart of the present invention;

[0042] Figure 2 The dry powder material of the red mud compound recovery powder prepared in Example 5 of the present invention;

[0043] Figure 3 This is the casting specimen prepared in Example 5 of the present invention. DETAILED DESCRIPTION

[0044] The present invention is further described in detail in the following examples. It should be noted that the following examples are intended to facilitate understanding of the present invention and do not have any limiting effect on the present invention.

[0045] Example 1

[0046] A high-early-strength cementitious material prepared from red mud recycled powder in an intermittent mixing plant comprises the following components by weight: 40 parts red mud, 30 parts recycled powder from the mixing plant, and 1 part catalyst. The particle size and weight percentage of the recycled powder from the mixing plant are as follows:

[0047] 0.125mm-0.25mm particle size screening: 80%;

[0048] 0.065mm-0.125mm particle size screening: 60%;

[0049] 0.020mm-0.065mm particle size screening: 50%.

[0050] After the red mud is carbon-enhanced and activated at high temperature by industrial waste heat from the mixing plant, the catalyst is added and the red mud is refined in a ball mill to a moisture content of 0.15% and a density of 2.10 g / cm 3 .

[0051] Both carbon enhancement and high-temperature activation utilize industrial waste heat from the mixing plant. The carbon enhancement temperature is 130°C and the high-temperature activation temperature is 300°C.

[0052] The recycled powder from the mixing plant is treated with carbon strengthening and high-temperature activation. During the carbon strengthening process, CO2 reacts with the active components in the recycled powder to form carbonized products, and during the high-temperature activation process, part of the recycled powder from the mixing plant will be converted into mineral admixtures in the form of microcrystalline. The carbonized products, mineral admixtures in the form of microcrystalline and calcium hydroxide and hydrated calcium silicate in the recycled powder from the mixing plant react to form active components of carbonized product cementitious materials, of which the content of active components of carbonized product cementitious materials is 23%, and the content of carbonized products is 36%.

[0053] The red mud is treated with carbon strengthening and high-temperature activation. The silicon and calcium in the red mud are converted into calcium silicate and calcium carbonate after carbon strengthening, and react with other components after high-temperature activation to obtain the main components of calcium silicate and calcium carbonate, of which the total mass of the active components CaSiO3 and CaCO3 is 42.3%.

[0054] The catalyst consists of a dispersant, a surfactant and an activity enhancer, and the weight ratio of the catalyst is as follows: 1 part of dispersant, 1 part of surfactant and 4 parts of activity enhancer.

[0055] The dispersant is a sulfonated ketone-aldehyde condensation polymer;

[0056] The surfactant is silicone resin;

[0057] The activity enhancer is mercaptopropyltriethoxysilane.

[0058] The preparation method of the above-mentioned gelling material comprises the following steps:

[0059] ① First calculate the production volume of recycled powder in the mixing plant per unit time, which is 30 parts by mass;

[0060] ② Carbon enhancement: Based on the recycled powder produced per unit time, 40 parts of red mud and 30 parts of recycled powder were placed in a 4:3 ratio in the heating drum of a batch mixing equipment and carbon enhanced for 10 minutes using waste heat. The carbon enhancement temperature was 130°C, and the content of active components of the cementitious material in the carbonized product generated by the reaction was 23%, and the content of the carbonized product was 36%.

[0061] ③ High-temperature activation: The carbon-enhanced recycled powder from the mixing plant and red mud are activated at high temperature for 20 minutes at a temperature of 300°C. The silicon and calcium in the red mud are converted into calcium silicate and calcium carbonate after carbon enhancement. After high-temperature activation, they react with other components to obtain calcium silicate and calcium carbonate as the main components, of which the total mass of the active components CaSiO3 and CaCO3 is 42.3%. The red mud and recycled powder from the mixing plant after carbon enhancement and high-temperature activation are collected in the recovery bin;

[0062] ④ Preparation of cementitious material: 40 parts of carbon-strengthened and high-temperature activated red mud, 30 parts of recycled powder from a mixing plant, and 1 part of a catalyst were added to a ball mill and fully milled for 25 minutes at a speed of 20 r / min to obtain the high early strength cementitious material described in Example 1.

[0063] Example 2

[0064] A high-early-strength cementitious material prepared from red mud and recycled powder using intermittent mixing equipment includes the following components by weight: 40 parts red mud, 40 parts recycled powder from the mixing plant, and 2 parts catalyst. The particle size and weight percentage of the recycled powder from the mixing plant are as follows:

[0065] 0.125mm-0.25mm particle size screening: 85%;

[0066] 0.065mm-0.125mm particle size screening: 65%;

[0067] 0.020mm-0.065mm particle size screening: 55%.

[0068] After the red mud is carbon-enhanced and activated at high temperature by industrial waste heat from the mixing plant, the catalyst is added and the red mud is refined in a ball mill to a moisture content of 0.5% and a density of 2.10 g / cm 3 .

[0069] Both carbon intensification and high-temperature activation utilize industrial waste heat from the mixing plant. The carbon intensification temperature is 140°C and the high-temperature activation temperature is 320°C.

[0070] The recycled powder from the mixing plant is treated with carbon strengthening and high-temperature activation. During the carbon strengthening process, CO2 reacts with the active components in the recycled powder to form carbonized products, and during the high-temperature activation process, part of the recycled powder from the mixing plant will be converted into mineral admixtures in the form of microcrystalline. The carbonized products, mineral admixtures in the form of microcrystalline and calcium hydroxide and calcium silicate hydrate in the recycled powder from the mixing plant react to form active components of carbonized product cementitious materials, of which the content of active components of carbonized product cementitious materials is 33%, and the content of carbonized products is 42%.

[0071] The red mud is treated with carbon strengthening and high-temperature activation. The silicon and calcium in the red mud are converted into calcium silicate and calcium carbonate after carbon strengthening, and react with other components after high-temperature activation to obtain the main components of calcium silicate and calcium carbonate, of which the total mass of the active components CaSiO3 and CaCO3 is 34.5%.

[0072] The catalyst consists of a dispersant, a surfactant and an activity enhancer, and the weight ratio of the catalyst is as follows: 2 parts of dispersant, 2 parts of surfactant and 6 parts of activity enhancer.

[0073] The dispersant is naphthalenesulfonate formaldehyde condensate;

[0074] The surfactant is sodium dodecylbenzenesulfonate;

[0075] The activity enhancer is diethylamine phosphate.

[0076] The preparation method of the above-mentioned gelling material comprises the following steps:

[0077] ① First calculate the production volume of recycled powder in the mixing plant per unit time, which is 30 parts by mass;

[0078] ② Carbon enhancement: Based on the recycled powder from the mixing plant produced per unit time, 40 parts of red mud and 40 parts of recycled powder from the mixing plant were placed in a heating drum of a batch mixing equipment in a ratio of 1:1 and carbon enhanced for 15 minutes using waste heat. The carbon enhancement temperature was 140°C, and the content of the active component of the cementitious material in the carbonized product generated by the reaction was 33%, and the content of the carbonized product was 42%;

[0079] ③ High-temperature activation: The carbon-enhanced recycled powder from the mixing plant and red mud are activated at high temperature for 22 minutes at a temperature of 320°C. The silicon and calcium in the red mud are converted into calcium silicate and calcium carbonate after carbon enhancement, and react with other components after high-temperature activation to obtain calcium silicate and calcium carbonate as the main components. The total mass of the active components CaSiO3 and CaCO3 is 34.5%. The red mud and recycled powder from the mixing plant after carbon enhancement and high-temperature activation are collected in the recovery bin;

[0080] ④ Preparation of cementitious material: 40 parts of red mud after carbon strengthening and high-temperature activation, 40 parts of recycled powder from mixing plant and 2 parts of catalyst were added to a ball mill and fully ball-milled for 25 minutes at a speed of 25 r / min to obtain the high early strength cementitious material described in Example 2.

[0081] Example 3

[0082] A high-early-strength cementitious material prepared from red mud and recycled powder using intermittent mixing equipment includes the following components by weight: 50 parts red mud, 40 parts recycled powder from the mixing plant, and 3 parts catalyst. The particle size and weight percentage of the recycled powder from the mixing plant are as follows:

[0083] 0.125mm-0.25mm particle size screening: 90%;

[0084] 0.065mm-0.125mm particle size screening: 70%;

[0085] 0.020mm-0.065mm particle size screening: 55%.

[0086] After the red mud is carbon-enhanced and activated at high temperature by industrial waste heat from the mixing plant, the catalyst is added and the red mud is refined in a ball mill to a moisture content of 0.35% and a density of 2.10 g / cm 3 .

[0087] Both carbon enhancement and high-temperature activation utilize industrial waste heat from the mixing plant. The carbon enhancement temperature is 150°C and the high-temperature activation temperature is 340°C.

[0088] The recycled powder from the mixing plant is treated with carbon strengthening and high-temperature activation. During the carbon strengthening process, CO2 reacts with the active components in the recycled powder to form carbonized products, and during the high-temperature activation process, part of the recycled powder from the mixing plant will be converted into mineral admixtures in the form of microcrystalline. The carbonized products, mineral admixtures in the form of microcrystalline and calcium hydroxide and calcium silicate hydrate in the recycled powder from the mixing plant react to form active components of carbonized product cementitious materials, of which the content of active components of carbonized product cementitious materials is 25%, and the content of carbonized products is 39%.

[0089] The red mud is treated with carbon strengthening and high-temperature activation. The silicon and calcium in the red mud are converted into calcium silicate and calcium carbonate after carbon strengthening, and react with other components after high-temperature activation to obtain the main components of calcium silicate and calcium carbonate, of which the total mass of the active components CaSiO3 and CaCO3 is 37.6%.

[0090] The catalyst consists of a dispersant, a surfactant and an activity enhancer, and the weight ratio of the catalyst is as follows: 4 parts of the dispersant, 2 parts of the surfactant and 8 parts of the activity enhancer.

[0091] The dispersant is naphthalenesulfonate formaldehyde condensate;

[0092] The surfactant is sodium dodecylbenzenesulfonate;

[0093] The activity enhancer is diethylamine phosphate.

[0094] The preparation method of the above-mentioned gelling material comprises the following steps:

[0095] ① First calculate the production volume of recycled powder in the mixing plant per unit time, which is 30 parts by mass;

[0096] ② Carbon enhancement: Based on the recycled powder from the mixing plant produced per unit time, 50 parts of red mud and 40 parts of recycled powder from the mixing plant were placed in a heating drum of a batch mixing equipment at a ratio of 5:4 and carbon enhanced for 15 minutes using waste heat. The carbon enhancement temperature was 150°C, and the content of the active component of the cementitious material in the carbonized product generated by the reaction was 25%, and the content of the carbonized product was 39%;

[0097] ③ High-temperature activation: The carbon-enhanced recycled powder from the mixing plant and red mud are activated at high temperature for 23 minutes at a temperature of 340°C. The silicon and calcium in the red mud are converted into calcium silicate and calcium carbonate after carbon enhancement. After high-temperature activation, they react with other components to obtain calcium silicate and calcium carbonate as the main components, of which the total mass of the active components CaSiO3 and CaCO3 is 37.6%. The red mud and recycled powder from the mixing plant after carbon enhancement and high-temperature activation are collected in the recovery bin;

[0098] ④ Preparation of cementitious material: 50 parts of carbon-strengthened and high-temperature activated red mud, 40 parts of recycled powder from a mixing plant, and 3 parts of a catalyst were added to a ball mill and fully milled for 30 minutes at a speed of 25 r / min to obtain the high early strength cementitious material described in Example 3.

[0099] Example 4

[0100] A high early strength cementitious material prepared from red mud compounded with recycled powder using an intermittent mixing plant comprises the following components by weight: 30 parts red mud, 60 parts recycled powder from the mixing plant, and 5 parts catalyst. The particle size and weight percentage of the recycled powder from the mixing plant are as follows:

[0101] 0.125mm-0.25mm particle size screening: 100%;

[0102] 0.065mm-0.125mm particle size screening: 70%;

[0103] 0.020mm-0.065mm particle size screening: 50%.

[0104] After the red mud is carbon-enhanced and activated at high temperature by industrial waste heat from the mixing plant, the catalyst is added and the red mud is refined in a ball mill to a moisture content of 0.1% and a density of 2.10 g / cm 3 .

[0105] Both carbon enhancement and high-temperature activation utilize industrial waste heat from the mixing plant. The carbon enhancement temperature is 170°C and the high-temperature activation temperature is 400°C.

[0106] The recycled powder from the mixing plant is treated with carbon strengthening and high-temperature activation. During the carbon strengthening process, CO2 reacts with the active components in the recycled powder to form carbonized products, and during the high-temperature activation process, part of the recycled powder from the mixing plant will be converted into mineral admixtures in the form of microcrystalline. The carbonized products, mineral admixtures in the form of microcrystalline and calcium hydroxide and calcium silicate hydrate in the recycled powder from the mixing plant react to form active components of carbonized product cementitious materials, of which the content of active components of carbonized product cementitious materials is 35%, and the content of carbonized products is 41%.

[0107] The red mud is treated with carbon strengthening and high-temperature activation. The silicon and calcium in the red mud are converted into calcium silicate and calcium carbonate after carbon strengthening, and react with other components after high-temperature activation to obtain the main components of calcium silicate and calcium carbonate, of which the total mass of the active components CaSiO3 and CaCO3 is 40.1%.

[0108] The catalyst consists of a dispersant, a surfactant and an activity enhancer, and the mass components thereof are as follows: 1 part of dispersant; 3 parts of surfactant; and 4 parts of activity enhancer.

[0109] The dispersant is a mixture of sulfonated ketone-aldehyde condensate and naphthalenesulfonate-formaldehyde condensate in a ratio of 1:1;

[0110] The surfactant is a mixture of silicone resin and sodium dodecylbenzenesulfonate in a ratio of 1:1;

[0111] The activity enhancer is a mixture of mercaptopropyl triethoxysilane and diethylamine phosphate in a ratio of 1:1.

[0112] The preparation method of the above-mentioned gelling material comprises the following steps:

[0113] ① First calculate the production volume of recycled powder in the mixing plant per unit time, which is 30 parts by mass;

[0114] ② Carbon enhancement: Based on the recycled powder from the mixing plant produced per unit time, 30 parts of red mud and 60 parts of recycled powder from the mixing plant were placed in a heating drum of a batch mixing equipment at a ratio of 1:2 and carbon enhanced for 20 minutes using waste heat. The carbon enhancement temperature was 170°C, and the content of the active component of the cementitious material in the carbonized product generated by the reaction was 35%, and the content of the carbonized product was 41%;

[0115] ③ High-temperature activation: The carbon-enhanced recycled powder from the mixing plant and red mud are activated at high temperature for 25 minutes at a temperature of 400°C. The silicon and calcium in the red mud are converted into calcium silicate and calcium carbonate after carbon enhancement, and react with other components after high-temperature activation to obtain calcium silicate and calcium carbonate as the main components. The total mass of the active components CaSiO3 and CaCO3 is 40.1%. The red mud and recycled powder from the mixing plant after carbon enhancement and high-temperature activation are collected in the recovery bin;

[0116] ④ Preparation of cementitious material: 30 parts of red mud after carbon strengthening and high temperature activation, 60 parts of recycled powder from mixing plant and 5 parts of catalyst were added to a ball mill and fully ball milled for 30 minutes at a speed of 35 r / min to obtain the high early strength cementitious material described in Example 4.

[0117] Example 5

[0118] A high-early-strength cementitious material prepared from red mud and recycled powder using intermittent mixing equipment includes the following components by weight: 60 parts red mud, 30 parts recycled powder from the mixing plant, and 3 parts catalyst. The particle size and weight percentage of the recycled powder from the mixing plant are as follows:

[0119] 0.125mm-0.25mm particle size screening: 95%;

[0120] 0.065mm-0.125mm particle size screening: 80%;

[0121] 0.020mm-0.065mm particle size screening: 60%.

[0122] After the red mud is carbon-enhanced and activated at high temperature by industrial waste heat from the mixing plant, the catalyst is added and the red mud is refined in a ball mill to a moisture content of 0.25% and a density of 2.15 g / cm 3 .

[0123] Both carbon enhancement and high-temperature activation utilize industrial waste heat from the mixing plant. The carbon enhancement temperature is 150°C and the high-temperature activation temperature is 360°C.

[0124] The recycled powder from the mixing plant is treated with carbon strengthening and high-temperature activation. During the carbon strengthening process, CO2 reacts with the active components in the recycled powder to form carbonized products, and during the high-temperature activation process, part of the recycled powder from the mixing plant will be converted into mineral admixtures in the form of microcrystalline. The carbonized products, mineral admixtures in the form of microcrystalline and calcium hydroxide and calcium silicate hydrate in the recycled powder from the mixing plant react to form active components of carbonized product cementitious materials, of which the content of active components of carbonized product cementitious materials is 24.5%, and the content of carbonized products is 38.4%.

[0125] The red mud is treated with carbon strengthening and high-temperature activation. The silicon and calcium in the red mud are converted into calcium silicate and calcium carbonate after carbon strengthening, and react with other components after high-temperature activation to obtain the main components of calcium silicate and calcium carbonate, of which the total mass of the active components CaSiO3 and CaCO3 is 36.3%.

[0126] The catalyst consists of a dispersant, a surfactant and an activity enhancer, and the weight ratio of the catalyst is as follows: 3 parts of the dispersant, 2 parts of the surfactant and 6 parts of the activity enhancer.

[0127] The dispersant is a mixture of sulfonated ketone-aldehyde condensate and naphthalenesulfonate-formaldehyde condensate in a ratio of 1:1;

[0128] The surfactant is a mixture of silicone resin and sodium dodecylbenzenesulfonate in a ratio of 1:1;

[0129] The activity enhancer is a mixture of mercaptopropyl triethoxysilane and diethylamine phosphate in a ratio of 1:1.

[0130] The preparation method of the above-mentioned gelling material comprises the following steps:

[0131] ① First calculate the production volume of recycled powder in the mixing plant per unit time, which is 30 parts by mass;

[0132] ② Carbon enhancement: Based on the recycled powder produced per unit time, 60 parts of red mud and 30 parts of recycled powder were placed in a heating drum of a batch mixing equipment at a ratio of 2:1 and carbon enhanced for 15 minutes using waste heat. The carbon enhancement temperature was 150°C, and the content of the active component of the cementitious material in the carbonized product generated by the reaction was 24.5%, and the content of the carbonized product was 38.4%;

[0133] ③ High-temperature activation: The carbon-enhanced recycled powder from the mixing plant and red mud are activated at high temperature for 25 minutes at a temperature of 360°C. The silicon and calcium in the red mud are converted into calcium silicate and calcium carbonate after carbon enhancement, and react with other components after high-temperature activation to obtain calcium silicate and calcium carbonate as the main components. The total mass of the active components CaSiO3 and CaCO3 is 36.3%. The red mud and recycled powder from the mixing plant after carbon enhancement and high-temperature activation are collected in the recovery bin;

[0134] ④ Preparation of cementitious material: 60 parts of carbon-strengthened and high-temperature activated red mud, 30 parts of recycled powder from a mixing plant, and 3 parts of a catalyst were added to a ball mill and fully milled for 35 minutes at a speed of 30 r / min to obtain the high early strength cementitious material described in Example 5.

[0135] In order to test the performance of high early strength cementitious materials prepared by red mud compound recycled powder, mortar was prepared according to the water-cement ratio of 0.28, and 40mm*40mm*160mm specimens were cast. The compressive strength and flexural strength were tested. The results are shown in Table 1.

[0136] Table 1 Properties of the cementitious materials prepared in Examples 1-5

[0137]

[0138] Table 1 shows the performance data for samples prepared according to Examples 1, 2, 3, 4, and 5. The cementitious materials exhibit excellent properties and rapid strength growth. The cementitious materials prepared in Examples 1-5 all exhibit high early strength. The ratio of recycled powder to red mud must be appropriately proportioned; a higher amount of recycled powder results in lower strength. The catalyst dosage also affects strength, and multiple factors should be considered in practical applications. Furthermore, the cementitious materials of the present invention are prepared from recycled powder waste from mixing plants and industrial solid red mud, reducing environmental pollution from recycled powder from mixing plants and utilizing the high-temperature waste heat from mixing plants. This represents a resource recycling technology with significant economic, social, and environmental benefits.

[0139] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A high early strength gelling material prepared by mixing red mud recycled powder with an intermittent mixing device, characterized in that: The composition includes the following parts by mass: 30-60 parts of red mud; 30-60 parts of recycled powder from mixing plant; 1-5 parts of catalyst; The red mud and the recycled powder from the mixing plant are added to the heating drum of the mixing plant in proportion, and carbon strengthening and high-temperature activation treatments are performed in sequence using the industrial waste heat of the mixing plant. The red mud, the recycled powder from the mixing plant, and the catalyst after carbon strengthening and high-temperature activation are then added to a ball mill and fully ball-milled to obtain a high-early-strength cementitious material prepared from the red mud composite recycled powder based on the intermittent mixing equipment. The carbon strengthening temperature is 130°C-170°C, and the high temperature activation temperature is 300°C-400°C; The recycled powder from the mixing plant is subjected to carbon strengthening and high-temperature activation treatment. During the carbon strengthening process, CO2 reacts with active components in the recycled powder from the mixing plant to form a carbonized product. During the high-temperature activation process, part of the recycled powder from the mixing plant is converted into a mineral admixture in the form of microcrystalline. The carbonized product, the mineral admixture in the form of microcrystalline, and the calcium hydroxide and calcium silicate hydrate in the recycled powder from the mixing plant react to form active components of the carbonized product cementitious material. The content of the active components of the carbonized product cementitious material is not less than 23%, and the content of the carbonized product is not less than 36%. The red mud is subjected to carbon strengthening and high-temperature activation treatment, whereby silicon and calcium in the red mud are converted into calcium silicate and calcium carbonate after carbon strengthening, and react with other components after high-temperature activation to obtain calcium silicate and calcium carbonate as the main components, wherein the total mass of the active components CaSiO3 and CaCO3 accounts for 34.5%-42.3%; The catalyst comprises a dispersant, a surfactant and an activity enhancer, and the mass parts thereof are as follows: 1-4 parts of dispersant; 1-3 parts of surfactant; 4-8 parts of activity enhancer; The dispersant is one or both of sulfonated ketone-aldehyde condensate and naphthalenesulfonate-formaldehyde condensate; The surfactant is one or both of silicone resin and sodium dodecylbenzenesulfonate; The activity enhancer is one or both of mercaptopropyltriethoxysilane and diethylamine phosphate.

2. The high early strength gelling material prepared by mixing red mud recycled powder with an intermittent mixing device according to claim 1, characterized in that: After the red mud is carbon-enhanced and activated at high temperature by industrial waste heat from the mixing plant, the catalyst is added and the red mud is refined in a ball mill to a moisture content of no more than 0.5% and a density of no more than 2.50g / cm³.

3. The high early strength gelling material prepared by mixing red mud recycled powder with intermittent mixing equipment according to claim 1, characterized in that: The particle size and mass fraction of the recycled powder from the mixing plant are as follows: 0.125mm-0.25mm particle size screening: 80%-100%; 0.065mm-0.125mm particle size screening: 80%-60%; 0.020mm-0.065mm particle size screening: 60%-50%.

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