High-early-strength cementing material prepared from red mud compound recycled powder based on intermittent mixing equipment and preparation method of high-early-strength cementing material

Abstract

The invention relates to the field of solid waste resource utilization research, in particular to a high-early-strength cementing material prepared from red mud compound recycled powder based on intermittent mixing equipment and a preparation method of the high-early-strength cementing material, and the high-early-strength cementing material is prepared from the following components in parts by mass: 30-60 parts of red mud, 30-60 parts of mixing plant recycled powder and 1-5 parts of a catalyst. According to the high-early-strength cementing material prepared from the red mud compound recycled powder, the red mud and the recycled powder are subjected to carbon strengthening and high-temperature activating treatment in a heating roller by using industrial waste heat of a mixing plant through open fire heating of the mixing plant; the high-strength cementing material can be obtained by adding the carbon-reinforced and high-temperature-activated red mud, the recycled powder and the catalyst into a ball mill according to a ratio for full ball milling, the strength grade of the cementing material is not lower than 40MPa, and the red mud, the recycled powder of the mixing plant and the like are greatly utilized, so that the effects of energy conservation, emission reduction, low carbon, environmental protection and resource recycling are achieved.

Description

Technical Field

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

[0002] Industrialization is an important process in today's world. In the process of industrial development, a large amount of waste materials are generated. In the process of industrial production, industrial solid waste represented by red mud and other waste materials are generated. Mixing plant equipment will also generate a lot of dust in the production process. If these wastes are not properly handled, they will pollute the environment. In order to solve this problem, a series of environmental protection measures have been taken, including optimizing the dust recovery and emission system, machinery use and management, and implementing energy-saving and emission reduction measures to reduce the generation of solid waste and negative impact on the environment. Therefore, how to efficiently utilize and dispose of red mud solid waste and mixing plant recovery powder waste is extremely important.

[0003] At present, for red mud and recycled powder from mixing equipment, the core of solid waste resource recycling lies in "conversion", 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 stockpiling, 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 waste 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. In addition, current research on the utilization of recycled powder from mixing equipment is mainly used in road base materials or partially replaces mineral powder for 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 compounded with 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] There are significant problems in the resource utilization of red mud and dust generated by mixing plants. The existing technology has 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 seek a high-early-strength cementitious material prepared from red mud compound recycled powder 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 an 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 treatments are added together into 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 an intermittent mixing device.

[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 accelerate the reaction between red mud and recycled powder and improve the early strength of 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 of the mixing plant are stimulated and improved. The cementitious material prepared by mixing the red mud after high temperature activation with the recycled powder has high compressive strength and durability, and can meet the needs of different construction projects.

[0015] 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 the active components in the recycled powder from the mixing plant to generate 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 generate active components of carbonized product cementitious materials, wherein the content of active components of the carbonized product cementitious materials is not less than 23%, and the content of the carbonized products is not less than 36%.

[0016] The red mud is subjected to carbon strengthening and high-temperature activation treatment, and 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 main components of calcium silicate and calcium carbonate, wherein the total mass of active components of CaSiO3 and CaCO3 is not more than 42.3%.

[0017] Furthermore, 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, and the moisture content is not more than 0.5% and the density is not more than 2.50g / cm 3 .

[0018] Furthermore, the particle size and mass percentage of the recycled powder from the mixing plant are as follows:

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

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

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

[0022] Furthermore, the catalyst comprises a dispersant, a surfactant and an activity enhancer, and the mass fractions thereof are as follows:

[0023] 1-4 parts of dispersant;

[0024] 1-3 parts of surfactant;

[0025] Activity enhancer 4-8 parts.

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

[0027] The surfactant can accelerate the hardening process of the cementitious material, making it reach the expected strength faster, and is helpful to improve its construction performance, reduce shrinkage and enhance 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 dodecylbenzene sulfonate.

[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 red mud compounded recycled powder based on an intermittent mixing device, comprising the following steps:

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

[0034] S2. Carbon strengthening: Based on the recycled powder of the mixing plant produced per unit time, red mud and recycled powder of the mixing plant are placed in a heating drum of an intermittent mixing equipment in proportion and carbon strengthened for 10-20 minutes using waste heat, wherein the carbon strengthening temperature is 130°C-170°C, and the content of active components of the cementitious material generated by the reaction carbonization product is not less than 23%, and the content of the carbonization product is not less than 36%;

[0035] S3. High temperature activation: The carbon-enhanced recycled powder from the mixing plant and the red mud are activated at high temperature for 20-25 minutes, wherein the high temperature activation temperature is 300°C-400°C, and 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, wherein the total mass of the active components of CaSiO3 and CaCO3 is not more than 42.3%, and the red mud and recycled powder from the mixing plant after carbon enhancement and high temperature activation are collected in the recovery bin;

[0036] S4. Preparation of cementitious materials: Add the carbon-strengthened and high-temperature activated red mud, the recycled powder from the mixing plant and the catalyst into a ball mill in proportion and fully ball-mill for 25-35 minutes at a rotation speed of 20-35r / min to obtain a high early strength cementitious material based on the red mud compound recycled powder of the intermittent mixing equipment.

[0037] The beneficial effects of the present invention include:

[0038] (1) The present invention discloses a high early strength cementitious material prepared by mixing 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 using industrial waste heat from a mixing plant. No additional high temperature heating is required. The red mud and recycled powder can be obtained by only sufficient ball milling in a ball mill. The method is a low-carbon and environmentally friendly cementitious material production method. The early strength index is achieved and the characteristics of a high early strength cementitious material are met.

[0039] (2) Effectively replace cement binder materials and have high strength characteristics, with a 28-day compressive strength of no less than 40MPa;

[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 the 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 compounded recycled powder based on an intermittent mixing device, comprising the following components by mass: 40 parts of red mud, 30 parts of recycled powder from a mixing plant, and 1 part of a catalyst. The particle size and mass 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 strengthened and activated by industrial waste heat from the mixing plant, the catalyst is added and the red mud is refined in a ball mill with a moisture content of 0.15% and a density of 2.10 g / cm 3 .

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

[0052] 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 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, wherein 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 calcium silicate and calcium carbonate as the main components, among which the total mass of active components CaSiO3 and CaCO3 is 42.3%.

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

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

[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 strengthening: Based on the recycled powder from the mixing plant produced per unit time, 40 parts of red mud and 30 parts of recycled powder from the mixing plant were placed in a heating drum of an intermittent mixing equipment at a ratio of 4:3 and carbon strengthened for 10 minutes using waste heat, wherein the carbon strengthening temperature was 130°C, and the content of active components of the cementitious material generated by the reaction in the carbonized product 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, wherein the high-temperature activation temperature is 300°C, and 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, wherein the total mass of the active components of CaSiO3 and CaCO3 is 42.3%, and 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: Add 40 parts of red mud after carbon strengthening and high temperature activation, 30 parts of recycled powder from mixing plant and 1 part of catalyst into a ball mill and fully ball grind for 25 minutes at a speed of 20r / 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 compound recycled powder based on intermittent mixing equipment, comprising the following components by mass: 40 parts of red mud, 40 parts of recycled powder from a mixing plant, and 2 parts of a catalyst. The particle size and mass 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 by high temperature with industrial waste heat from the mixing plant, the catalyst is added and the red mud is refined in a ball mill with a moisture content of 0.5% and a density of 2.10 g / cm 3 .

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

[0070] 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 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, wherein 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 calcium silicate and calcium carbonate as the main components, among which the total mass of active components CaSiO3 and CaCO3 is 34.5%.

[0072] The catalyst is composed of a dispersant, a surfactant and an activity enhancer, and the weight proportions thereof are as follows: 2 parts of the dispersant; 2 parts of the surfactant; and 6 parts of the activity enhancer.

[0073] The dispersant is naphthalenesulfonate formaldehyde condensate;

[0074] The surfactant is sodium dodecylbenzene sulfonate;

[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 strengthening: 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 an intermittent mixing equipment at a ratio of 1:1 and carbon strengthened for 15 minutes using waste heat, wherein the carbon strengthening temperature was 140°C, and the content of active components of the cementitious material generated by the reaction in the carbonized product 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, wherein the high-temperature activation temperature is 320°C, and 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, wherein the total mass of the active components of CaSiO3 and CaCO3 is 34.5%, and 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: Add 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 into a ball mill and fully ball grind 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 compound recycled powder based on intermittent mixing equipment, comprising the following components by mass: 50 parts of red mud, 40 parts of recycled powder from a mixing plant, and 3 parts of a catalyst. The particle size and mass 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 by high temperature with industrial waste heat from the mixing plant, the catalyst is added and the red mud is refined in a ball mill with a moisture content of 0.35% and a density of 2.10 g / cm 3 .

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

[0088] 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 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, wherein 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 calcium silicate and calcium carbonate as the main components, among which the total mass of the active components CaSiO3 and CaCO3 is 37.6%.

[0090] The catalyst is composed of a dispersant, a surfactant and an activity enhancer, and the weight proportions thereof are 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 dodecylbenzene sulfonate;

[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 strengthening: 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 an intermittent mixing equipment at a ratio of 5:4 and carbon strengthened for 15 minutes using waste heat, wherein the carbon strengthening temperature was 150°C, and the content of active components of the cementitious material generated by the reaction in the carbonized product 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, wherein the high-temperature activation temperature is 340°C, and 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, wherein the total mass of the active components of CaSiO3 and CaCO3 is 37.6%, and 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: Add 50 parts of red mud after carbon strengthening and high temperature activation, 40 parts of recycled powder from mixing plant and 3 parts of catalyst into a ball mill and fully ball grind for 30 minutes at a speed of 25r / 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 recycled powder based on an intermittent mixing device, comprising the following components by mass: 30 parts of red mud, 60 parts of recycled powder from a mixing plant, and 5 parts of a catalyst. The particle size and mass percentage of the recycled powder from the mixing plant are:

[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 by high temperature with industrial waste heat from the mixing plant, the catalyst is added and the red mud is refined in a ball mill with a moisture content of 0.1% and a density of 2.10 g / cm 3 .

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

[0106] 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 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, wherein 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 calcium silicate and calcium carbonate as the main components, among which the total mass of active components CaSiO3 and CaCO3 is 40.1%.

[0108] The catalyst is composed of a dispersant, a surfactant and an activity enhancer, and the weight proportions thereof are as follows: 1 part of the dispersant; 3 parts of the surfactant; and 4 parts of the 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 dodecylbenzene sulfonate in a ratio of 1:1;

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

[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 strengthening: 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 an intermittent mixing equipment at a ratio of 1:2 and carbon strengthened for 20 minutes using waste heat, wherein the carbon strengthening temperature was 170°C, and the content of active components of the cementitious material generated by the reaction in the carbonized product 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, wherein the high-temperature activation temperature is 400°C, and 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, wherein the total mass of the active components of CaSiO3 and CaCO3 is 40.1%, and 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: Add 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 into a ball mill and fully ball grind for 30 minutes at a speed of 35r / 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 compound recycled powder based on intermittent mixing equipment, comprising the following components by mass: 60 parts of red mud, 30 parts of recycled powder from a mixing plant, and 3 parts of a catalyst. The particle size and mass 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 by high temperature with industrial waste heat from the mixing plant, the catalyst is added and the red mud is refined in a ball mill with a moisture content of 0.25% and a density of 2.15 g / cm 3 .

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

[0124] 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 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, wherein 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 calcium silicate and calcium carbonate as the main components, among which the total mass of active components CaSiO3 and CaCO3 is 36.3%.

[0126] The catalyst is composed of a dispersant, a surfactant and an activity enhancer, and the weight proportions thereof are 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 dodecylbenzene sulfonate in a ratio of 1:1;

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

[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 strengthening: Based on the recycled powder from the mixing plant produced per unit time, 60 parts of red mud and 30 parts of recycled powder from the mixing plant were placed in a heating drum of an intermittent mixing equipment at a ratio of 2:1 and carbon strengthened for 15 minutes using waste heat, wherein the carbon strengthening temperature was 150°C, and the content of active components of the cementitious material generated by the reaction carbonization product was 24.5%, and the content of the carbonization 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, wherein the high-temperature activation temperature is 360°C, and 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, wherein the total mass of the active components of CaSiO3 and CaCO3 is 36.3%, and 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: Add 60 parts of red mud after carbon strengthening and high temperature activation, 30 parts of recycled powder from mixing plant and 3 parts of catalyst into a ball mill and fully ball grind 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 to test their compressive strength and flexural strength. The results are shown in Table 1.

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

[0137]

[0138] It can be found that Table 1 is the performance data of samples prepared according to Examples 1, 2, 3, 4, and 5. The cementitious materials have excellent properties and fast strength growth. The cementitious materials prepared in Examples 1-5 all have high early strength characteristics. The proportion of recycled powder and red mud needs to be reasonably proportioned. The higher the amount of recycled powder, the lower the strength. The amount of catalyst also affects the strength. In practical applications, the influence of multiple factors should be considered; in addition, the cementitious material of the present invention is prepared from recycled powder waste of mixing plant and industrial solid waste red mud, which reduces the pollution of recycled powder of mixing plant to the environment and utilizes the high-temperature waste heat resources of mixing plant. It belongs to resource recycling technology and has significant economic, social and environmental benefits.

[0139] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. 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 cementitious material prepared by mixing red mud recycled powder based on intermittent mixing equipment, characterized in that: The composition includes the following components in parts by weight: 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 put into the heating drum of the mixing plant in proportion, and the carbon strengthening and high-temperature activation treatments are performed in sequence by using the industrial waste heat of the mixing plant. Then, the red mud, the recycled powder from the mixing plant and the catalyst after the carbon strengthening and high-temperature activation treatments are added together into 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 the active components in the recycled powder from the mixing plant to generate carbonized products, and during the high-temperature activation process, part of the recycled powder from the mixing plant is converted into mineral admixtures in the form of microcrystalline. The carbonized products, the mineral admixtures in the form of microcrystalline, and the calcium hydroxide and calcium silicate hydrate in the recycled powder from the mixing plant react to generate active components of the carbonized product cementitious material, wherein 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, and 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 main components of calcium silicate and calcium carbonate, wherein the total mass of active components of CaSiO3 and CaCO3 is not more than 42.3%.

2. According to claim 1, a high early strength cementitious material prepared by red mud compounding and recycling powder based on intermittent mixing equipment, characterized in that: After the red mud is strengthened and activated by industrial waste heat from the mixing plant, the catalyst is added and the water content is not more than 0.5% and the density is not more than 2.50g / cm 3 .

3. The high early strength cementitious material prepared by red mud compounding recycled powder based on intermittent mixing equipment according to claim 1, characterized in that: The particle size and mass percentage 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%.

4. The high early strength cementitious material prepared by red mud compounding and recycling powder based on intermittent mixing equipment according to claim 1, characterized in that: 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; Activity enhancer 4-8 parts.

5. The high early strength cementitious material prepared by red mud compounding and recycling powder based on intermittent mixing equipment according to claim 4, characterized in that: The dispersant is one or two of sulfonated ketone-aldehyde condensation products and naphthalenesulfonate formaldehyde condensation products.

6. The high early strength cementitious material prepared by red mud compounding and recycling powder based on intermittent mixing equipment according to claim 4, characterized in that: The surfactant is one or both of silicone resin and sodium dodecylbenzene sulfonate.

7. The high early strength cementitious material prepared by red mud compounding and recycling powder based on intermittent mixing equipment according to claim 4, characterized in that: The activity enhancer is one or two of mercaptopropyl triethoxysilane and diethylamine phosphate.

8. A method for preparing a high early strength gelling material based on red mud compounded recycled powder using an intermittent mixing device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. First, calculate the production of recycled powder in the mixing plant per unit time, and the production volume is calculated by mass; S2. Carbon strengthening: Based on the recycled powder of the mixing plant produced per unit time, red mud and recycled powder of the mixing plant are placed in a heating drum of an intermittent mixing equipment in proportion and carbon strengthened for 10-20 minutes using waste heat, wherein the carbon strengthening temperature is 130°C-170°C, and the content of active components of the cementitious material generated by the reaction carbonization product is not less than 23%, and the content of the carbonization product is not less than 36%; S3. High temperature activation: The carbon-enhanced recycled powder from the mixing plant and the red mud are activated at high temperature for 20-25 minutes, wherein the high temperature activation temperature is 300°C-400°C, and 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, wherein the total mass of the active components of CaSiO3 and CaCO3 is not more than 42.3%, and the red mud and recycled powder from the mixing plant after carbon enhancement and high temperature activation are collected in the recovery bin; S4. Preparation of cementitious materials: Add the carbon-strengthened and high-temperature activated red mud, the recycled powder from the mixing plant and the catalyst into a ball mill in proportion and fully ball-mill for 25-35 minutes at a rotation speed of 20-35r / min to obtain a high early strength cementitious material based on the red mud compound recycled powder of the intermittent mixing equipment.

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