Autoclaved aerated concrete as well as preparation method and application thereof

Abstract

The invention relates to the field of ecological materials prepared from solid wastes, in particular to autoclaved aerated concrete as well as a preparation method and application thereof. The autoclaved aerated concrete is mainly prepared from the following components in parts by mass: 85 to 95 parts of first slurry, 10 to 20 parts of quick lime, 10 to 20 parts of cement and 0.02 to 0.2 part of a foaming agent, wherein the first slurry comprises second slurry and gypsum in a mass ratio of (60-90): (2-4); the second slurry comprises organic artificial quartz stone waste slurry, triethanolamine, slaked lime and an anionic dispersant in a mass ratio of (60-90): (0.2-0.5): (1-3): (0.05-0.2). The autoclaved aerated concrete has the characteristics of light weight, high strength and high waste slurry mixing amount.

Description

Technical Field

[0001] The present invention relates to the field of preparing ecological materials from solid waste, and in particular to autoclaved aerated concrete and a preparation method and application thereof. Background Art

[0002] Autoclaved aerated concrete is a lightweight and porous building material with low density, good thermal insulation performance and certain strength. It is made of siliceous and calcareous materials as the main raw materials, mixed with gas-generating agents, stirred with water, and formed by chemical reactions. It is made through processes such as static curing, demoulding cutting, and autoclaving curing. Some studies have proposed using solid waste to prepare autoclaved aerated concrete to realize the resource utilization of solid waste. However, autoclaved aerated concrete prepared with a large amount of solid waste has poor performance in terms of thermal insulation and compression resistance, and also has problems such as high energy consumption and environmental pollution.

[0003] In recent years, with the rapid development of the construction industry, artificial stone, as a kind of artificial building decorative stone, is widely used in countertops, facades, decoration and other aspects. The annual output of artificial stone industry reaches tens of millions square meters, mainly organic artificial quartz stone, but organic artificial quartz stone will produce a lot of stone wastewater in the process of cutting, grinding and polishing, and then form organic artificial quartz stone waste slurry after multi-stage sedimentation treatment. According to statistics, 200 tons of waste slurry will be generated for every 10,000 square meters of artificial stone produced. At present, the disposal methods of waste slurry of organic artificial quartz stone manufacturers are relatively simple, and the disposal methods of artificial stone waste slurry are mainly open-air stacking or recycling and preparation of products.

[0004] Among the main components of organic quartz waste slurry, the content of silica minerals is about 90%, and the content of organic unsaturated polyester resin is about 10%. It should be a high-quality siliceous raw material for autoclaved aerated concrete. Artificial stone waste slurry can be used in autoclaved aerated concrete to achieve green treatment of waste. However, since it contains about 10% unsaturated polyester resin, the resin component will cause insufficient cement hydration reaction during the initial gasification and curing process of autoclaved aerated concrete, resulting in a slow setting effect. During the curing and demolding process, the test block is prone to collapse, resulting in low test block yield, unstable production, and substandard compressive strength.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] In order to solve the problem of low dosage of organic artificial quartz waste slurry in autoclaved aerated concrete and low quality of autoclaved aerated concrete, the present invention provides an autoclaved aerated concrete and a preparation method and application thereof, so that a large dosage of organic quartz waste slurry can be applied to the autoclaved aerated concrete industry and the concrete has the characteristics of light weight and high strength, thereby absorbing a large amount of industrial solid waste generated by the artificial quartz industry.

[0007] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0008] One aspect of the present invention relates to an autoclaved aerated concrete, which is mainly made of the following components in parts by mass:

[0009] 40-50 parts of the first slurry, 10-20 parts of quicklime, 10-20 parts of cement and 0.02-0.2 parts of a foaming agent;

[0010] Wherein, the first slurry comprises the second slurry and gypsum in a mass ratio of 60-90:2-4;

[0011] The second slurry includes organic artificial quartz waste slurry, triethanolamine, slaked lime and anionic dispersant in a mass ratio of 60-90:0.2-0.5:1-3:0.05-0.2.

[0012] The autoclaved aerated concrete has the characteristics of light weight, high strength and high waste slurry content.

[0013] Another aspect of the present invention also relates to a method for preparing the autoclaved aerated concrete, comprising the following steps:

[0014] (a) ball milling the raw material to obtain a second slurry;

[0015] The raw materials include: organic artificial quartz waste slurry, triethanolamine, slaked lime and anionic dispersant;

[0016] (b) mixing the second slurry and gypsum to obtain a first slurry;

[0017] (c) subjecting the mixture containing the first slurry, quicklime, cement and foaming agent to gasification, stabilization, cutting and autoclaving.

[0018] The method for preparing the autoclaved aerated concrete has simple procedures, low energy consumption, is environmentally friendly, and has low preparation cost. The prepared autoclaved aerated concrete has good performance.

[0019] Another aspect of the present invention also relates to a building material, comprising the autoclaved aerated concrete or the autoclaved aerated concrete prepared by the preparation method of the autoclaved aerated concrete.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The autoclaved aerated concrete provided by the present invention uses organic quartz waste slurry as one of the raw materials. The silicon content in the waste slurry reaches more than 85%. The waste slurry works together with other raw materials and is combined with a specific preparation method to completely replace the siliceous raw material with the organic quartz waste slurry. The waste slurry content reaches more than 65%. Compared with other solid waste autoclaved aerated concrete, it has the characteristics of being lighter and higher in strength.

[0022] (2) The method for preparing autoclaved aerated concrete provided by the present invention uses organic artificial quartz stone waste slurry as the siliceous raw material, and does not require additional crushing treatment, thus saving steps; the method does not require calcination treatment, thus reducing the energy consumption required for heating during calcination, is low-carbon and environmentally friendly, and has a low preparation cost. DETAILED DESCRIPTION

[0023] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments, but it will be appreciated by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work, all belong to the scope of protection of the present invention. If specific conditions are not indicated in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0024] One aspect of the present invention relates to an autoclaved aerated concrete, which is mainly made of the following components in parts by mass:

[0025] 85-95 parts of the first slurry, 10-20 parts of quicklime, 10-20 parts of cement and 0.02-0.2 parts of a foaming agent;

[0026] Wherein, the first slurry comprises the second slurry and gypsum in a mass ratio of 60 to 90:2 to 4 (for example, but not limited to 60:4, 65:3.5, 70:3, 75:2.5, 80:4, 85:2 or 90:2);

[0027] The second slurry includes organic artificial quartz waste slurry, triethanolamine, slaked lime and anionic dispersant in a mass ratio of 60 to 90: 0.2 to 0.5: 1 to 3: 0.05 to 0.2 (for example, but not limited to 60: 0.5: 3: 0.05, 65: 0.4: 2.5: 0.08, 70: 0.4: 2: 0.10, 75: 0.3: 1.5: 0.15, 80: 0.3: 2: 0.13, 85: 0.5: 1.5: 0.18 or 90: 0.2: 1: 0.2).

[0028] In some specific embodiments, the first slurry may be, for example, but not limited to, any one of 85, 87, 89, 91, 93 or 95 parts, or a range between any two of them, measured in parts by mass; the quicklime may be, for example, but not limited to, any one of 10, 12, 14, 16, 18 or 20 parts, or a range between any two of them; the cement may be, for example, but not limited to, any one of 10, 12, 14, 16, 18 or 20 parts, or a range between any two of them; the foaming agent may be, for example, but not limited to, any one of 0.02, 0.05, 0.08, 0.1, 0.15, 0.18 or 0.2 parts, or a range between any two of them.

[0029] The present invention mixes a large amount of organic quartz waste slurry into the autoclaved aerated concrete, which can absorb a large amount of industrial solid waste generated by the artificial quartz industry and realize the resource utilization of industrial solid waste. At the same time, the autoclaved aerated concrete provided by the present invention has the characteristics of light weight, high strength and high waste slurry content.

[0030] Triethanolamine has the function of aiding grinding. It is adsorbed on the surface of organic quartz waste slurry, reduces the electrostatic attraction between particles, disperses the particles, and avoids particle adhesion and aggregation. At the same time, triethanolamine can also be used as a cement early strength agent, which can enhance the activity of the colloid generated by cement hydration, promote the reaction between C3A and gypsum to form hydrated calcium sulfoaluminate, thereby accelerating the coagulation and hardening of cement, improving its early strength, shortening the static time, reducing the probability of mold collapse of test blocks during the autoclaving curing stage, and improving production stability.

[0031] Lime provides an alkaline environment, which promotes the hydrolysis of some unsaturated polyesters. The polyols produced by the hydrolysis of unsaturated polyesters work together with the added anionic dispersant to disperse the powder particles wrapped by the resin, further improving the grinding effect. The smaller resin particles produced by decomposition have the effect of toughening and strengthening, improving the overall performance of autoclaved aerated concrete.

[0032] The autoclaved aerated concrete, in which the components are combined in a certain proportion, can play a synergistic role, increase the strength supporting effect of cement in the early test block gasification process, and reduce the influence of unsaturated polyester resin on cement hydration reaction.

[0033] Furthermore, the autoclaved aerated concrete is mainly made of the following components in terms of mass fractions:

[0034] 87-93 parts of the first slurry, 12-18 parts of quicklime, 12-18 parts of cement and 0.08-0.15 parts of a foaming agent;

[0035] Wherein, the first slurry comprises the second slurry and gypsum in a mass ratio of 65-85:2.5-3.5;

[0036] The second slurry includes organic artificial quartz waste slurry, triethanolamine, slaked lime and anionic dispersant in a mass ratio of 65-85:0.3-0.4:1.5-2.5:0.08-0.15.

[0037] Furthermore, the D of the particles in the second slurry is 50 The particle size of the particles in the second slurry is limited to a certain range, so that more quartz surfaces of the organic quartz waste slurry particles can be exposed, more tobermorite can be generated during the autoclaving process, and the prepared autoclaved aerated concrete has properties such as light weight and high strength. The particle size of the particles in the slurry will affect the reaction rate of tobermorite generation and the overall water requirement of the ALC formula.

[0038] Furthermore, the water-to-material ratio of the autoclaved aerated concrete is 0.5 to 0.9, including but not limited to any point value of 0.5, 0.6, 0.65, 0.7, 0.75, 0.8 or 0.9 or a range value between any two of them. Controlling the water-to-material ratio within a reasonable range is beneficial to improving the strength and other properties of the autoclaved aerated concrete. The ALC prepared from waste slurry can also adjust the water demand through a water reducer, and adjust the bulk density through the water demand.

[0039] Furthermore, the water content of the organic artificial quartz waste slurry is 0% to 35%, including but not limited to any point value of 0.01%, 0.1%, 0.5%, 1%, 5%, 10%, 15%, 20%, 25%, 30% or 35% or a range value between any two of them.

[0040] Furthermore, the water content of the first slurry is 45% to 60%, including but not limited to any point value of 45%, 50%, 55% or 60% or a range value between any two of them.

[0041] The present invention does not limit the specific type of the foaming agent, and conventional foaming agents in the art can be used to implement the technical solution of the present invention. In some specific embodiments, the foaming agent includes but is not limited to: aluminum and / or hydrogen peroxide.

[0042] Furthermore, the aluminum includes but is not limited to: aluminum powder and / or aluminum paste.

[0043] The present invention does not limit the specific type of anionic dispersants, and conventional anionic dispersants in the art can be used to implement the technical solution of the present invention. In some specific embodiments, the anionic dispersant includes but is not limited to: sodium oleate, alkyl phosphate or fatty alcohol polyoxyethylene ether phosphate.

[0044] Furthermore, the effective content of CaO in the quicklime is greater than 70wt%.

[0045] Furthermore, the gypsum includes but is not limited to: ordinary power plant gypsum or analytically pure calcium sulfate dihydrate.

[0046] Furthermore, the technical solution of the present invention can be achieved by selecting conventional cement in the art, including but not limited to PO 42.5 cement.

[0047] Another aspect of the present invention also relates to a method for preparing the autoclaved aerated concrete, comprising the following steps:

[0048] (a) ball milling the raw material to obtain a second slurry;

[0049] The raw materials include: organic artificial quartz waste slurry, triethanolamine, slaked lime and anionic dispersant;

[0050] (b) mixing the second slurry and gypsum to obtain a first slurry;

[0051] (c) subjecting the mixture containing the first slurry, quicklime, cement and foaming agent to gasification, stabilization, cutting and autoclaving.

[0052] The method for preparing autoclaved aerated concrete uses organic artificial quartz waste slurry as the siliceous raw material. The waste slurry is sludge formed after multi-stage sedimentation treatment of a large amount of stone wastewater generated during the cutting, grinding and polishing of organic artificial quartz. The particle size is finer than that of solid waste from other industries, so no additional crushing treatment is required, saving processes.

[0053] The method for preparing the autoclaved aerated concrete does not require calcination treatment, reduces the energy consumption required for heating during calcination, is low-carbon and environmentally friendly, and has low preparation cost.

[0054] The method for preparing the autoclaved aerated concrete does not require drying of the wet waste blocks produced by the filter pressing of the organic artificial stone, which greatly reduces the energy loss required for this step and fundamentally reduces environmental pollution.

[0055] The method for preparing autoclaved aerated concrete can be used to prepare autoclaved aerated concrete test blocks, autoclaved aerated concrete panels and other related autoclaved aerated concrete building materials.

[0056] Furthermore, the rotation speed of the ball mill is 30 to 40 r / min, including but not limited to any point value of 30 r / min, 32 r / min, 34 r / min, 36 r / min, 38 r / min or 40 r / min or a range value between any two of them.

[0057] Furthermore, the ball milling time is 60 to 90 min, including but not limited to any one of 60 min, 65 min, 70 min, 75 min, 80 min, 85 min or 90 min or a range between any two of them.

[0058] After ball milling, the organic artificial quartz waste slurry particles will expose more quartz surfaces, so that more tobermorite will be generated during the autoclaving process of the waste slurry.

[0059] Furthermore, the gas generation quiescent temperature is 60-70° C., including but not limited to any point value of 60° C., 62° C., 64° C., 66° C., 68° C. or 70° C. or any range value between two of them. If the gas generation quiescent temperature is too low, it will lead to a large heat loss of the embryo in the early stage, which is not conducive to the cement hydration reaction and the embryo hardening is uneven. If the gas generation quiescent temperature is too high, it will lead to too fast hardening, which is not conducive to stress release and gas generation uniformity.

[0060] Furthermore, the gas generation static stop time is 4 to 6 hours, including but not limited to any point value of 4 hours, 4.5 hours, 5 hours, 5.5 hours or 6 hours or any range value between two of them. Based on the raw material ratio of autoclaved aerated concrete, the gas generation static stop time is reasonably designed. Compared with the gas generation static stop time of traditional autoclaved aerated concrete, the present invention shortens the gas generation static stop time.

[0061] Furthermore, the pressure of the autoclave curing is 1.0-1.5 MPa, including but not limited to any point value of 1.0 MPa, 1.1 MPa, 1.2 MPa, 1.3 MPa, 1.4 MPa or 1.5 MPa or any range value between two of them. Too low steam pressure will lead to insufficient steam curing pressure, affecting the strength development of the board, while too high steam pressure will cause cracks in the test block and also affect the final strength.

[0062] Furthermore, the temperature of the autoclave curing is 190-240°C, including but not limited to any point value of 190°C, 200°C, 210°C, 220°C, 230°C or 240°C or a range value between any two of them. The excitation temperature of the siliceous raw material (waste slurry) is around 190°C. When the temperature is lower than this temperature, the activity of the siliceous raw material cannot be fully excited. However, when the temperature is too high (greater than 240°C), the tobermorite generated by autoclaving will be converted into other products of xonotlite, which will reduce the strength of the blocks.

[0063] Furthermore, the heating time of the autoclave curing is 3 to 5 hours (for example, it can be but not limited to any one of 3 hours, 3.5 hours, 4 hours, 4.5 hours or 5 hours, or a range between any two of them), the constant temperature time is 8 to 12 hours (for example, it can be but not limited to any one of 8 hours, 9 hours, 10 hours, 11 hours or 12 hours, or a range between any two of them), and the cooling time is 3 to 5 hours (for example, it can be but not limited to any one of 3 hours, 3.5 hours, 4 hours, 4.5 hours or 5 hours, or a range between any two of them).

[0064] Another aspect of the present invention also relates to a building material, comprising the autoclaved aerated concrete or the autoclaved aerated concrete prepared by the preparation method of the autoclaved aerated concrete.

[0065] The embodiments of the present invention will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. If no specific conditions are specified in the examples, the conditions are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be obtained commercially.

[0066] Example 1

[0067] The autoclaved aerated concrete provided in this embodiment has a water-to-material ratio of 0.74 and is mainly made of the following components in terms of mass fractions:

[0068] 92.675 parts of the first slurry, 17.5 parts of quicklime, 14 parts of cement and 0.1 parts of aluminum powder;

[0069] Wherein, the first slurry comprises the second slurry and gypsum in a mass ratio of 89.175:3.5;

[0070] The second slurry includes organic artificial quartz waste slurry, triethanolamine, slaked lime and alkyl phosphate in a mass ratio of 87:0.348:1.74:0.087.

[0071] The method for preparing autoclaved aerated concrete provided in this embodiment comprises the following steps:

[0072] 1. Add triethanolamine, slaked lime and alkyl phosphate to the organic artificial quartz waste slurry, and perform ball milling in a ball mill to obtain a second slurry; the ball milling speed is 40r / min, and the time is 60min; the second slurry is mixed with gypsum to obtain a first slurry, and the water content of the first slurry is 56%;

[0073] 2. Mix the first slurry with cement and quicklime for 5 minutes at a stirring rate of 1500r / min;

[0074] 3. Mix aluminum powder and water and add them to the slurry in step 2. Increase the stirring speed to 2000r / min and stir for 2 minutes.

[0075] 4. Pour the slurry mixed evenly in step 3 into the mold and allow it to naturally gasify in a 66°C environment for 5 hours;

[0076] 5. De-mould the test block and cut it into standard test blocks;

[0077] 6. Send the test pieces with uniform gasification in step 5 into the autoclave for autoclave curing. The autoclave pressure is 1.2MPa, the autoclave temperature is 190℃, the heating time is 4h, the constant temperature time is 10h, and the cooling time is 4h.

[0078] 7. Steam and cure the product out of the kettle, and then cure it at room temperature to finally obtain qualified autoclaved aerated concrete products.

[0079] The performance of autoclaved aerated concrete products was tested. The test standard referred to "Autoclaved Aerated Concrete Board" GB15762-2020, and the results are shown in Table 1.

[0080] Table 1

[0081] Example <![CDATA[Density (kg / m 3 )]]> Compressive strength(MPa) 1-3 640 5.6

[0082] Example 2

[0083] The autoclaved aerated concrete provided in this embodiment has a water-to-cement ratio of 0.7 and is mainly made of the following components in terms of mass fractions:

[0084] 90 parts of the first slurry, 20 parts of quicklime, 10 parts of cement and 0.02 parts of aluminum paste;

[0085] Wherein, the first slurry comprises the second slurry and gypsum in a mass ratio of 86:4;

[0086] The second slurry includes organic artificial quartz waste slurry, triethanolamine, slaked lime and sodium oleate in a mass ratio of 84.75:0.2:1:0.05.

[0087] The method for preparing autoclaved aerated concrete provided in this embodiment comprises the following steps:

[0088] 1. Add triethanolamine, slaked lime and alkyl phosphate to the organic artificial quartz waste slurry, and perform ball milling in a ball mill to obtain a second slurry; the speed of the ball mill is 30 r / min, and the time is 90 min; the second slurry is mixed with gypsum to obtain a first slurry, and the water content of the first slurry is 56%;

[0089] 2-3, same as embodiment 1;

[0090] 4. Pour the slurry mixed evenly in step 3 into the mold and allow it to naturally gasify in a 60°C environment for 6 hours;

[0091] 5. Same as Example 1;

[0092] 6. Send the test pieces with uniform gasification in step 5 into the autoclave for autoclave curing. The autoclave pressure is 1.0 MPa, the autoclave temperature is 200°C, the heating time is 3 hours, the constant temperature time is 8 hours, and the cooling time is 3 hours.

[0093] 7. Same as Example 1.

[0094] Example 3

[0095] The autoclaved aerated concrete provided in this embodiment has a water-to-cement ratio of 0.8 and is mainly made of the following components in terms of mass fractions:

[0096] 92 parts of the first slurry, 10 parts of quicklime, 20 parts of cement and 0.2 parts of hydrogen peroxide;

[0097] Wherein, the first slurry comprises the second slurry and gypsum in a mass ratio of 90:2;

[0098] The second slurry includes organic artificial quartz waste slurry, triethanolamine, slaked lime and fatty alcohol polyoxyethylene ether phosphate in a mass ratio of 86.3:0.5:3:0.2.

[0099] The method for preparing autoclaved aerated concrete provided in this embodiment comprises the following steps:

[0100] 1. Add triethanolamine, slaked lime and alkyl phosphate to the organic artificial quartz waste slurry, and perform ball milling in a ball mill to obtain a second slurry; the speed of the ball mill is 35 r / min, and the time is 75 min; the second slurry is mixed with gypsum to obtain a first slurry, and the water content of the first slurry is 56%;

[0101] 2-3, same as embodiment 1;

[0102] 4. Pour the slurry mixed evenly in step 3 into the mold and allow it to naturally gasify in a 70°C environment for 4 hours;

[0103] 5. Same as Example 1;

[0104] 6. Send the test pieces with uniform gasification in step 5 into the autoclave for autoclave curing. The autoclave pressure is 1.1MPa, the autoclave temperature is 240℃, the heating time is 3.5h, the constant temperature time is 9h, and the cooling time is 3.5h.

[0105] 7. Same as Example 1.

[0106] Example 4

[0107] The autoclaved aerated concrete provided in this embodiment has a water-to-cement ratio of 0.75 and is mainly made of the following components in terms of mass fractions:

[0108] First slurry 88.5 parts, quicklime 18 parts, cement 12 parts and aluminum powder 0.05 parts;

[0109] Wherein, the first slurry comprises the second slurry and gypsum in a mass ratio of 85:3.5;

[0110] The second slurry includes organic artificial quartz waste slurry, triethanolamine, slaked lime and alkyl phosphate in a mass ratio of 83.12:0.3:1.5:0.08.

[0111] The method for preparing autoclaved aerated concrete provided in this embodiment comprises the following steps:

[0112] 1. Add triethanolamine, slaked lime and alkyl phosphate to the organic artificial quartz waste slurry, and perform ball milling in a ball mill to obtain a second slurry; the ball milling speed is 34r / min, and the time is 80min; the second slurry is mixed with gypsum to obtain a first slurry, and the water content of the first slurry is 56%;

[0113] 2-3, same as embodiment 1;

[0114] 4. Pour the slurry mixed evenly in step 3 into the mold and allow it to naturally gasify in a 62°C environment for 5 hours;

[0115] 5. Same as Example 1;

[0116] 6. Send the test pieces with uniform gasification in step 5 into the autoclave for autoclave curing. The autoclave pressure is 1.3MPa, the autoclave temperature is 230℃, the heating time is 4.5h, the constant temperature time is 10h, and the cooling time is 4h;

[0117] 7. Same as Example 1.

[0118] Example 5

[0119] The autoclaved aerated concrete provided in this embodiment has a water-to-cement ratio of 0.65 and is mainly made of the following components in terms of mass fractions:

[0120] 90 parts of the first slurry, 12 parts of quicklime, 18 parts of cement and 0.15 parts of aluminum paste;

[0121] Wherein, the first slurry comprises the second slurry and gypsum in a mass ratio of 87.5:2.5;

[0122] The second slurry includes organic artificial quartz waste slurry, triethanolamine, slaked lime and alkyl phosphate in a mass ratio of 84.45:0.4:2.5:0.15.

[0123] The method for preparing autoclaved aerated concrete provided in this embodiment comprises the following steps:

[0124] 1. Add triethanolamine, slaked lime and alkyl phosphate to the organic artificial quartz waste slurry, and perform ball milling in a ball mill to obtain a second slurry; the speed of the ball mill is 38 r / min, and the time is 65 min; the second slurry is mixed with gypsum to obtain a first slurry, and the water content of the first slurry is 56%;

[0125] 2-3, same as embodiment 1;

[0126] 4. Pour the slurry mixed evenly in step 3 into the mold and allow it to naturally gasify in a 68°C environment for 5 hours;

[0127] 5. Same as Example 1;

[0128] 6. Send the test pieces with uniform gasification in step 5 into the autoclave for autoclave curing. The autoclave pressure is 1.5MPa, the autoclave temperature is 210℃, the heating time is 5h, the constant temperature time is 12h, and the cooling time is 5h.

[0129] 7. Same as Example 1.

[0130] The performance of the autoclaved aerated concrete prepared in Examples 2 to 5 was tested, and the results are shown in Table 2.

[0131] Table 2

[0132] <![CDATA[Density (kg / m 3 )]]> Compressive strength(MPa) Example 2 633 5.3 Example 3 649 5.8 Example 4 625 5.2 Example 5 610 5.0

[0133] Example 6

[0134] The difference between this embodiment and embodiment 1 is that the aluminum powder is 0.14 parts and the water-to-material ratio is 0.77. The performance test results are shown in Table 3.

[0135] Table 3

[0136] Example <![CDATA[Density (kg / m 3 )]]> Compressive strength(MPa) 6 495 4.1

[0137] Comparative Example 1

[0138] The difference between this comparative example and Example 1 is that triethanolamine, slaked lime and alkyl phosphate are not added. The performance test results are shown in Table 4.

[0139] Table 4

[0140] Comparative Example <![CDATA[Density (kg / m 3 )]]> Compressive strength(MPa) 1 637 3.1

[0141] Comparative Example 2

[0142] The difference between this comparative example and Example 1 is that no triethanolamine was added.

[0143] Comparative Example 3

[0144] The difference between this comparative example and Example 1 is that the second slurry includes organic artificial quartz stone waste slurry, triethanolamine, slaked lime and alkyl phosphate in a mass ratio of 95:0.1:4:0.087.

[0145] The performance of the autoclaved aerated concrete prepared in Comparative Examples 2 to 3 was tested, and the results are shown in Table 5.

[0146] Table 5

[0147] <![CDATA[Density (kg / m 3 )]]> Compressive strength(MPa) Comparative Example 2 630 3.3 Comparative Example 3 626 3.1

[0148] In summary, the technical solution provided by the present invention can produce product test blocks of A3.5 B05 and A5.0 B06, with the industrial waste content reaching more than 65%, and the physical and chemical properties of the test blocks meet the national standards. If triethanolamine, slaked lime and anionic dispersant are not added to activate and grind the waste slurry, a large amount of addition will result in the strength of the aerated test blocks failing to meet the national standard compressive strength requirements.

[0149] Although the present invention has been illustrated and described with specific embodiments, it should be appreciated that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Those skilled in the art should understand that the technical solutions described in the above embodiments may be modified, or some or all of the technical features thereof may be replaced by equivalents without departing from the spirit and scope of the present invention. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. Therefore, this means that all such replacements and modifications within the scope of the present invention are included in the appended claims.

Claims

1. An autoclaved aerated concrete, characterized in that: According to the mass percentage, it is mainly made of the following components: 85-95 parts of the first slurry, 10-20 parts of quicklime, 10-20 parts of cement and 0.02-0.2 parts of a foaming agent; Wherein, the first slurry comprises the second slurry and gypsum in a mass ratio of 60-90:2-4; The second slurry includes organic artificial quartz waste slurry, triethanolamine, slaked lime and anionic dispersant in a mass ratio of 60-90:0.2-0.5:1-3:0.05-0.

2.

2. The autoclaved aerated concrete according to claim 1, characterized in that the autoclaved aerated concrete is mainly made of the following components in parts by mass: 87-93 parts of the first slurry, 12-18 parts of quicklime, 12-18 parts of cement and 0.08-0.15 parts of a foaming agent; Wherein, the first slurry comprises: 2.5 to 3.5 second slurry and gypsum; The second slurry includes organic artificial quartz waste slurry, triethanolamine, slaked lime and anionic dispersant in a mass ratio of 65-85:0.3-0.4:1.5-2.5:0.08-0.

15.

3. The autoclaved aerated concrete according to claim 1 or 2, characterized in that: The D of the particles in the second slurry 50 45~55μm.

4. The autoclaved aerated concrete according to claim 1 or 2, characterized in that: The water-to-material ratio of the autoclaved aerated concrete is 0.5-0.

9.

5. The autoclaved aerated concrete according to claim 1 or 2, characterized in that: The foaming agent includes: aluminum and / or hydrogen peroxide; And / or, the anionic dispersant includes: one of sodium oleate, alkyl phosphate or fatty alcohol polyoxyethylene ether phosphate.

6. The method for preparing autoclaved aerated concrete according to any one of claims 1 to 5, characterized in that: The following steps are involved: (a) ball milling the raw material to obtain a second slurry; The raw materials include: organic artificial quartz waste slurry, triethanolamine, slaked lime and anionic dispersant; (b) mixing the second slurry and gypsum to obtain a first slurry; (c) subjecting the mixture containing the first slurry, quicklime, cement and foaming agent to gasification, stabilization, cutting and autoclaving.

7. The method for preparing autoclaved aerated concrete according to claim 6, characterized in that: The rotation speed of the ball mill is 30-40 r / min; And / or, the ball milling time is 60 to 90 minutes.

8. The method for preparing autoclaved aerated concrete according to claim 6, characterized in that: The temperature at which the gas is stopped is 60-70°C; And / or, the gas emission and static stopping time is 4 to 6 hours.

9. The method for preparing autoclaved aerated concrete according to claim 6, characterized in that: Includes at least one of the following technical features: (1) The pressure of the autoclave curing is 1.0 to 1.5 MPa; (2) The temperature of the autoclave curing is 190-240° C.; (3) The heating time of the autoclave curing is 3 to 5 hours, the constant temperature time is 8 to 12 hours, and the cooling time is 3 to 5 hours.

10. A building material, characterized in that: The invention relates to an autoclaved aerated concrete comprising the autoclaved aerated concrete according to any one of claims 1 to 5 or the autoclaved aerated concrete prepared by the method for preparing the autoclaved aerated concrete according to any one of claims 6 to 9.