Thin-layer masonry mortar based on all industrial solid waste and preparation method thereof

Abstract

The embodiment of the application discloses a kind of based on whole industrial solid waste's thin layer masonry mortar and preparation method thereof.The thin layer masonry mortar includes: industrial solid waste low-carbon cementing material 20-30%, tungsten tailings sand aggregate 70-80%, admixture 3-8% by weight percentage.The thin layer masonry mortar provided by the application meets or exceeds the technical parameters of M5 grade thin layer masonry mortar specified in GB / T 25181-2019 ready-mixed mortar, and has practical application value.In addition, the application not only can absorb a large amount of industrial solid waste, but also can reduce the amount of cement, to a certain extent, solve the environmental pollution caused by a large amount of carbon emissions in cement production, meet the low-carbon environmental protection requirements.

Description

Technical Field

[0001] This invention relates to the field of mortar technology, specifically to a thin-layer masonry mortar based on all industrial solid waste and its preparation method. Background Technology

[0002] Thin-layer masonry mortar is mainly used in high-precision block construction. Its thin mortar joints effectively reduce wall shrinkage and settlement, and minimize cracking in the wall and plaster. It is suitable for high-flatness fly ash-filled blocks, aerated concrete blocks, lightweight brick-aerated concrete block series, highly absorbent wall materials, lightweight partitions, and lightweight partitions. The thickness of thin-layer masonry mortar is generally 3mm to 5mm.

[0003] Currently, the main raw materials for thin-layer masonry mortar are commercial cement, manufactured sand, fly ash, heavy calcium carbonate, and admixtures. Because coarse-grained manufactured sand is used as aggregate, its microscopic surface has a porous structure after hydration and molding, making it prone to stress stress and settlement later on, leading to wall cracking and even damage to exterior wall finishes, putty, paint, or tiles. Simultaneously, the medium sand (2.3mm–3mm) used has a relatively coarse particle size, making it difficult to be completely coated by the cementitious material at the current masonry layer thickness, resulting in reduced bond strength and poor product quality. Furthermore, cement production is costly, generates significant carbon emissions, and pollutes the environment. Summary of the Invention

[0004] Therefore, embodiments of the present invention provide a thin-layer masonry mortar based on all industrial solid waste and its preparation method.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] According to a first aspect of the present invention, the present invention provides a thin-layer masonry mortar based on all industrial solid waste, the thin-layer masonry mortar comprising, by weight percentage: 20%-30% low-carbon cementitious material from industrial solid waste, 70%-80% tungsten tailings aggregate, and 3%-8% admixture.

[0007] Furthermore, the industrial solid waste low-carbon cementitious material is composed of the following components by weight percentage: 10%-30% silica fume, 40%-60% granulated blast furnace slag powder, 10%-15% gypsum powder, 10%-30% desulfurization ash, and 10%-20% sodium sulfate.

[0008] The roles of each component in the low-carbon cementitious material for industrial solid waste are as follows:

[0009] Silica fume: During the smelting of ferrosilicon and industrial silicon (metallic silicon), a large amount of highly volatile SiO2 and Si gases are generated in the electric arc furnace. After the gases are released, they rapidly oxidize and condense upon contact with air, forming silica fume. Silica fume exhibits pozzolanic activity; when added to water along with other raw materials, a hydration reaction occurs. The silica fume immediately undergoes a secondary hydration reaction with Ca(OH)2 (i.e., the pozzolanic reaction), generating CSH gel. This process both consumes the Ca(OH)2 in the hydrated concrete paste and increases the amount of CSH gel (a product of the pozzolanic reaction).

[0010] Granulated blast furnace slag powder: It is a high-fineness, high-activity powder obtained by water-quenched blast furnace slag through drying, grinding and other processes. Because the slag powder contains a lot of C2S minerals, CSH gel is generated first, and at the same time, some Ca(OH)2 is consumed, which makes the CSH gel increase continuously, and finally forms a strong hydration product.

[0011] Gypsum powder: The main component of industrial by-product gypsum is calcium sulfate, which plays a role in activating the hydration reaction of active silica fume and granulated blast furnace slag powder, and provides Ca... 2+ It participates in hydration reactions.

[0012] Desulfurization ash: Solid waste from dry desulfurization in sintering plants of metallurgical enterprises. Its main components are quicklime and calcium sulfate, which provide a suitable alkaline environment for the hydration reaction system and provide the Ca required for hydration. 2+ and SO4 2- .

[0013] Sodium sulfate: Its main component is sodium sulfate, which is also one of the waste salts in the chemical industry. It provides a suitable alkaline environment for the hydration reaction system and provides the SO4 required for hydration. 2- It also plays a role in regulating the setting time of low-carbon cementitious materials.

[0014] The inventors have discovered that a low-carbon cementitious material formed by compounding silica fume, granulated blast furnace slag powder, gypsum powder, desulfurization ash, and sodium sulfate in the above-mentioned proportions is beneficial in preventing cracking of thin-layer masonry mortar, increasing the compressive strength of later masonry layers, and reducing wall settlement.

[0015] Furthermore, the tungsten tailings aggregate is composed of the following components by weight percentage: 5%-15% 20-100 mesh tungsten tailings, 25%-50% 100-200 mesh tungsten tailings, and 35%-60% 200-400 mesh tungsten tailings powder.

[0016] The inventors discovered that adding tungsten tailings sand aggregate with the above-mentioned gradation relationship to low-carbon cementitious materials from industrial solid waste can optimize the aggregate particle size distribution, improve the density of mortar, and thus improve its compressive strength and shear strength. This is more conducive to reducing segregation and bleeding, and improving the workability of the mortar.

[0017] Further, the additives, by weight percentage, include: 5%-10% defoamer, 20%-30% dispersible latex powder, 5%-10% starch ether, 30%-60% cellulose ether, 5%-10% polycarboxylate superplasticizer, and 5%-10% thixotropic agent.

[0018] The functions and mechanisms of each component in the admixture are as follows:

[0019] Defoamers are generally used to reduce air bubbles introduced into the mortar layer, as well as air bubbles displaced after filling the pores on the surface of aerated concrete blocks during the masonry process, thereby making the masonry mortar layer denser and stronger. The defoamers selected in this invention include dimethyl silicone oil and hydroxyl silicone oil.

[0020] Dispersible latex powder: generally a water-based polymer material, mainly used to bind fine aggregates and increase the strength of the material layer; at the same time, it can form a stable polymer film on the surface of the mortar layer, reducing moisture loss in the early stage of the reaction. The dispersible latex powder selected in this invention includes a copolymer of ethylene and vinyl acetate.

[0021] Starch ethers and cellulose ethers contain a large number of hydrophilic groups, which mainly function to retain water in mortar, preventing the mixing water from easily escaping and allowing for a full hydration reaction to form a continuous, stable, and dense material. The starch ethers selected in this invention include carboxymethyl starch ether; the cellulose ethers include hydroxypropyl methylcellulose ether, with a viscosity of 100,000-150,000.

[0022] Polycarboxylate superplasticizers primarily reduce the amount of water used in mixing and allow the powder to disperse more effectively, facilitating hydration reactions and ultimately improving the mechanical strength of the material. The polycarboxylate superplasticizer used in this invention is the commercially available PC1701 type.

[0023] Thixotropic agents primarily enhance the workability of mortar, reducing its viscosity and increasing its fluidity during mixing for better blending; simultaneously, they reduce fluidity after molding, preventing sagging. The thixotropic agent used in this invention includes fumed silica.

[0024] The inventors have discovered that the admixture provided by this invention is beneficial for improving the construction of thin-layer masonry mortar under various temperature and humidity conditions, with broader construction requirements and relatively lower technical experience requirements for workers.

[0025] Furthermore, the preparation methods for the 20-100 mesh tungsten tailings sand, 100-200 mesh tungsten tailings sand, and 200-400 mesh tungsten tailings powder are as follows:

[0026] (1) The tungsten tailings slurry was subjected to hydrocyclone dewatering and classification treatment to obtain 20-200 mesh wet fine sand and 200-400 mesh wet micro powder;

[0027] (2) Backwash the wet fine sand and wet micro powder to remove the mineral processing reagents contained therein;

[0028] (3) The wet fine sand from step (2) is subjected to secondary cyclone dewatering and classification treatment, stockpiling and dewatering treatment and boiling furnace drying to obtain 20-200 mesh dry fine sand, and then 20-100 mesh tungsten tailings sand and 100-200 mesh tungsten tailings sand by swaying sieve.

[0029] (4) The wet micro powder from step (2) is subjected to secondary cyclone dehydration and classification, pressure filtration and fluidized bed drying to obtain 200-400 mesh tungsten tailings micro powder.

[0030] Furthermore, in step (3), the water content of the wet fine sand after secondary cyclone dewatering and classification treatment is 20% to 30%, and the water content after stockpiling and dewatering treatment is 7% to 10%.

[0031] Furthermore, in step (4), the water content of the wet micro powder is 30%-40% after secondary cyclone dehydration and classification treatment, and 12%-15% after pressure filtration treatment.

[0032] Furthermore, the temperature for drying in the fluidized bed oven is 400℃-600℃.

[0033] According to a second aspect of the present invention, the present invention provides a method for preparing thin-layer masonry mortar based on all industrial solid waste as described above, the method comprising:

[0034] Industrial solid waste low-carbon cementitious materials and tungsten tailings sand aggregates are respectively fed into powder tanks using pneumatic equipment, and then transported to mixing mixers via metering pumps and horizontal screw conveyors. The mixtures are thoroughly mixed for 10 minutes. Admixtures are added from the feed port of the mixing mixer according to the mortar dosage, and then the mixtures are stirred for another 15 minutes to obtain the finished product.

[0035] The embodiments of the present invention have the following advantages:

[0036] 1. This invention uses tungsten tailings from metal mines as aggregate for thin-layer masonry mortar, and the aggregate is entirely tailings, making it a green building material product that not only disposes of solid waste but also reduces the impact of tungsten tailings on the surrounding environment and safety.

[0037] 2. This invention uses building mortar prepared entirely from industrial solid waste. The system does not contain cement materials and uses industrial solid waste with hydration activity as a substitute. This not only allows for the large-scale disposal of industrial solid waste, giving it certain value and turning waste into treasure, but also reduces the amount of cement used. This can, to some extent, solve the environmental pollution caused by the large amount of carbon emissions from cement production. According to calculations, the comprehensive carbon emissions of the all-solid waste cementitious material of this invention are only 1 / 10 of those of cement, which meets the requirements of low-carbon and environmental protection.

[0038] 3. The tailings sand used in this invention has a finer particle size than traditional coarse and medium sand. The finer aggregates can be mixed together, easily filling the gaps between coarse aggregates and being more easily coated by cementing materials. This results in a denser, stronger masonry layer with better adhesion and less cracking. Furthermore, it is inexpensive, costing only 1 / 3 to 1 / 2 the price of manufactured sand, offering a significant cost advantage.

[0039] 4. The thin-layer masonry mortar provided by this invention has performance that meets or exceeds the technical parameters of M5 grade thin-layer masonry mortar specified in GB / T 25181-2019 premixed mortar, and has practical application value. Detailed Implementation

[0040] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the following content,

[0042] Silica fume: 95% content, specific surface area 400m² 2 / g, a product sold in Shijiazhuang Yilu Market;

[0043] Granulated blast furnace slag powder: Specific surface area 325m 2 / g, Shaogang S95 grade mineral powder;

[0044] Gypsum powder: Sulfur trioxide content 43%, Hunan Guhui desulfurized gypsum powder;

[0045] Desulfurization ash: solid waste desulfurization ash from Shaogang Sintering Plant;

[0046] Sodium sulfate: Industrial grade sodium sulfate, sodium sulfate content 90%;

[0047] Defoamer: Dimethyl silicone oil, Shandong Xingrui;

[0048] Dispersible latex powder: a copolymer of ethylene and vinyl acetate, Langfang Tengding dispersible latex powder;

[0049] Starch ether: Shandong Forman carboxymethyl starch ether;

[0050] Cellulose ether: Hydroxypropyl methylcellulose ether, viscosity 100,000, Hebei Shuangniu;

[0051] Polycarboxylate superplasticizer: Commercially available PC1701 type polycarboxylate superplasticizer;

[0052] Thixotropic agent: Fumed silica, Hubei Huifu.

[0053] The preparation methods for 20-100 mesh tungsten tailings sand, 100-200 mesh tungsten tailings sand, and 200-400 mesh tungsten tailings powder are as follows:

[0054] (1) The tungsten tailings slurry (water content 60%-70%, purchased from a tungsten mine in Chenzhou, Hunan) was subjected to hydrocyclone dewatering and classification treatment to initially separate the tungsten tailings into 20-200 mesh fine sand and 200-400 mesh micro powder;

[0055] (2) The fine sand and powder separated in step (1) are backwashed to remove the mineral processing reagents contained in the tailings.

[0056] (3) The fine sand obtained in step (2) is subjected to secondary cyclone dewatering and classification treatment, with a water content of about 25%. Then it is subjected to stockpiling and dewatering treatment. After about 3 days of stockpiling, the water content is reduced to about 10%. Then it is placed in a fluidized bed furnace and dried at 500℃. At the same time, the remaining mineral processing reagents are removed to meet the qualified use requirements. The dried tungsten tailings are subjected to sway screening to separate the tungsten tailings into two grades: 20-100 mesh and 100-200 mesh, to obtain 20-100 mesh tungsten tailings and 100-200 mesh tungsten tailings for use.

[0057] (4) The micro powder obtained in step (2) is subjected to secondary cyclone dehydration and classification treatment, with a water content of about 35%. Then it is subjected to pressure filtration treatment, with the water content reduced to about 15%. Finally, it is placed in a fluidized bed furnace and dried at 500℃ to obtain 200-400 mesh tungsten tailings micro powder.

[0058] Example 1

[0059] This embodiment provides a thin-layer masonry mortar, the raw materials of which are:

[0060] 20 parts of low-carbon cementitious material from industrial solid waste: 2 parts silica fume (10%), 8 parts granulated blast furnace slag powder (40%), 3 parts gypsum powder (15%), 4 parts desulfurization ash (20%), and 3 parts sodium sulfate (15%).

[0061] 80 parts of tungsten tailings aggregate: 10 parts of 20-100 mesh tungsten tailings (12.5%), 40 parts of 100-200 mesh tungsten tailings (50%), and 30 parts of 200-400 mesh tungsten tailings powder (37.5%).

[0062] Additives in 5 parts: defoamer 0.25 parts (5%), dispersible latex powder 1 part (20%), starch ether 0.25 parts (5%), cellulose ether 3 parts (60%), polycarboxylate superplasticizer 0.25 parts (5%), thixotropic agent 0.25 parts (5%).

[0063] The preparation method of the aforementioned thin-layer masonry mortar includes: industrial solid waste low-carbon cementitious material, dried tailings fine sand, and dried tailings micro powder are separately fed into a powder tank using pneumatic equipment, and then conveyed into a 2 cubic meter mixing mixer according to a certain ratio via a metering pump and a horizontal screw conveyor. The mixture is first thoroughly stirred for 10 minutes. Then, all admixtures are mixed according to the ratio and homogenized for 30 minutes. Finally, the admixtures are added into the mixing mixer according to the mortar dosage, and the mixture is stirred for another 15 minutes to obtain the finished product.

[0064] Example 2

[0065] This embodiment provides a thin-layer masonry mortar, the raw materials of which are:

[0066] 30 parts of low-carbon cementitious materials from industrial solid waste: 6 parts silica fume (20%), 15 parts granulated blast furnace slag powder (50%), 3 parts gypsum powder (10%), 3 parts desulfurization ash (10%), and 3 parts sodium sulfate (10%).

[0067] 70 parts of tungsten tailings aggregate: 5 parts of 20-100 mesh tungsten tailings (7.2%), 40 parts of 100-200 mesh tungsten tailings (57.1%), and 25 parts of 200-400 mesh tungsten tailings powder (35.7%).

[0068] Additives in 6 parts: defoamer 0.3 parts (5%), dispersible latex powder 1.38 parts (23%), starch ether 0.6 parts (10%), cellulose ether 3 parts (50%), polycarboxylate superplasticizer 0.36 parts (6%), thixotropic agent 0.36 parts (6%).

[0069] The preparation method of the above-mentioned thin-layer masonry mortar is the same as that in Example 1.

[0070] Example 3

[0071] This embodiment provides a thin-layer masonry mortar, the raw materials of which are:

[0072] 25 parts of low-carbon cementitious materials from industrial solid waste: 3.75 parts silica fume (15%), 11.25 parts granulated blast furnace slag powder (45%), 3 parts gypsum powder (12%), 4.5 parts desulfurization ash (18%), and 2.5 parts sodium sulfate (10%).

[0073] 75 parts of tungsten tailings aggregate: 8 parts of 20-100 mesh tungsten tailings (10.7%), 30 parts of 100-200 mesh tungsten tailings (40%), and 37 parts of 200-400 mesh tungsten tailings powder (49.3%).

[0074] 8 parts of admixtures: 0.48 parts of defoamer (6%), 1.76 parts of dispersible latex powder (22%), 0.48 parts of starch ether (6%), 4.4 parts of cellulose ether (55%), 0.48 parts of polycarboxylate superplasticizer (6%), and 0.4 parts of thixotropic agent (5%).

[0075] The preparation method of the above-mentioned thin-layer masonry mortar is the same as that in Example 1.

[0076] Example 4

[0077] This embodiment provides a thin-layer masonry mortar, the raw materials of which are:

[0078] 20 parts of low-carbon cementitious materials from industrial solid waste: 3.6 parts silica fume (18%), 10.4 parts granulated blast furnace slag powder (52%), 1.6 parts gypsum powder (8%), 2 parts desulfurization ash (10%), and 2.4 parts sodium sulfate (12%).

[0079] 80 parts of tungsten tailings aggregate: 5 parts of 20-100 mesh tungsten tailings (6.25%), 28 parts of 100-200 mesh tungsten tailings (35%), and 47 parts of 200-400 mesh tungsten tailings powder (58.75%).

[0080] Additives in 3 parts: defoamer 0.3 parts (10%), dispersible latex powder 0.9 parts (30%), starch ether 0.15 parts (5%), cellulose ether 1.17 parts (39%), polycarboxylate superplasticizer 0.24 parts (8%), thixotropic agent 0.24 parts (8%).

[0081] The preparation method of the above-mentioned thin-layer masonry mortar is the same as that in Example 1.

[0082] Example 5

[0083] This embodiment provides a thin-layer masonry mortar, the raw materials of which are:

[0084] 23 parts of low-carbon cementitious materials from industrial solid waste: 6.9 parts silica fume (30%), 9.2 parts granulated blast furnace slag powder (40%), 2.3 parts gypsum powder (10%), 2.3 parts desulfurization ash (10%), and 2.3 parts sodium sulfate (10%).

[0085] 77 parts of tungsten tailings aggregate: 8 parts of 20-100 mesh tungsten tailings (accounting for 10.4%), 24 parts of 100-200 mesh tungsten tailings (accounting for 31.2%), and 45 parts of 200-400 mesh tungsten tailings powder (accounting for 58.4%).

[0086] 7 parts of admixtures: 0.56 parts of defoamer (8%), 1.89 parts of dispersible latex powder (27%), 0.56 parts of starch ether (8%), 2.94 parts of cellulose ether (42%), 0.42 parts of polycarboxylate superplasticizer (6%), and 0.63 parts of thixotropic agent (9%).

[0087] The preparation method of the above-mentioned thin-layer masonry mortar is the same as that in Example 1.

[0088] Comparative Example 1

[0089] This comparative example provides a thin-layer masonry mortar, the raw materials of which are:

[0090] 20 parts of 425 cement;

[0091] 80 parts of tungsten tailings aggregate: 10 parts of 20-100 mesh tungsten tailings (12.5%), 40 parts of 100-200 mesh tungsten tailings (50%), and 30 parts of 200-400 mesh tungsten tailings powder (37.5%).

[0092] Additives in 5 parts: defoamer 0.25 parts (5%), dispersible latex powder 1 part (20%), starch ether 0.25 parts (5%), cellulose ether 3 parts (60%), polycarboxylate superplasticizer 0.25 parts (5%), thixotropic agent 0.25 parts (5%).

[0093] Comparative Example 2

[0094] This comparative example provides a thin-layer masonry mortar, the raw materials of which are:

[0095] 20 parts of low-carbon cementitious material from industrial solid waste: 2 parts silica fume (10%), 8 parts granulated blast furnace slag powder (40%), 3 parts gypsum powder (15%), 4 parts desulfurization ash (20%), and 3 parts sodium sulfate (15%).

[0096] 80 parts of tungsten tailings sand aggregate: 30 parts of 20-100 mesh manufactured sand (37.5%), 40 parts of 100-200 mesh manufactured sand (50%), and 10 parts of 200-400 mesh tungsten tailings powder (12.5%).

[0097] Additives in 5 parts: defoamer 0.25 parts (5%), dispersible latex powder 1 part (20%), starch ether 0.25 parts (5%), cellulose ether 3 parts (60%), polycarboxylate superplasticizer 0.25 parts (5%), thixotropic agent 0.25 parts (5%).

[0098] Comparative Example 3

[0099] This comparative example provides a thin-layer masonry mortar, the raw materials of which are:

[0100] 40 parts of low-carbon cementitious materials from industrial solid waste: 4 parts silica fume (10%), 16 parts granulated blast furnace slag powder (40%), 6 parts gypsum powder (15%), 8 parts desulfurization ash (20%), and 6 parts sodium sulfate (15%).

[0101] 60 parts of tungsten tailings aggregate: 6 parts of 20-100 mesh tungsten tailings (10%), 24 parts of 100-200 mesh tungsten tailings (40%), and 30 parts of 200-400 mesh tungsten tailings micro-aggregate (50%).

[0102] Additives in 5 parts: defoamer 0.25 parts (5%), dispersible latex powder 1 part (20%), starch ether 0.25 parts (5%), cellulose ether 3 parts (60%), polycarboxylate superplasticizer 0.25 parts (5%), thixotropic agent 0.25 parts (5%).

[0103] Test Example 1

[0104] The performance of the thin-layer masonry mortars prepared in Examples 1-5 and Comparative Examples 1-3 were tested according to GB / T 25181-2019 Premixed Mortar, and the results are shown in Table 1.

[0105] Table 1

[0106]

[0107] Compared with Comparative Examples 1-3, Examples 1-5 show significant improvements in compressive strength and tensile bond strength, indicating that this application possesses better mechanical properties under the current tungsten tailings gradation and low-carbon cementitious material system.

[0108] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A thin-layer masonry mortar based entirely on industrial solid waste, characterized in that, The thin-layer masonry mortar comprises, by weight percentage: 20%-30% industrial solid waste low-carbon cementitious material, 70%-80% tungsten tailings aggregate, and admixtures, wherein the amount of admixtures is 3%-8% of the total weight of the industrial solid waste low-carbon cementitious material and the tungsten tailings aggregate; The industrial solid waste low-carbon cementitious material is composed of the following components by weight percentage: silica fume 10%-30%, granulated blast furnace slag powder 40%-60%, gypsum powder 10%-15%, desulfurization ash 10%-30%, and sodium sulfate 10%-20%. The tungsten tailings aggregate is composed of the following components by weight percentage: 5%-15% tungsten tailings sand of 20-100 mesh, 25%-50% tungsten tailings sand of 100-200 mesh, and 35%-60% tungsten tailings powder of 200-400 mesh; The additives, by weight percentage, include: 5%-10% defoamer, 20%-30% dispersible latex powder, 5%-10% starch ether, 30%-60% cellulose ether, 5%-10% polycarboxylate superplasticizer, and 5%-10% thixotropic agent.

2. The thin-layer masonry mortar according to claim 1, characterized in that, The preparation methods for the 20-100 mesh tungsten tailings sand, 100-200 mesh tungsten tailings sand, and 200-400 mesh tungsten tailings powder are as follows: (1) The tungsten tailings slurry was subjected to hydrocyclone dewatering and classification treatment to obtain 20-200 mesh wet fine sand and 200-400 mesh wet micro powder; (2) Backwashing is performed on wet fine sand and wet micro powder to remove the mineral processing reagents contained therein; (3) The wet fine sand from step (2) is subjected to secondary cyclone dewatering and classification treatment, stockpiling and dewatering treatment and boiling furnace drying to obtain 20-200 mesh dry fine sand, and then 20-100 mesh tungsten tailings sand and 100-200 mesh tungsten tailings sand are obtained by shaking sieve. (4) The wet micro powder from step (2) is subjected to secondary cyclone dehydration and classification, pressure filtration and fluidized bed drying to obtain 200-400 mesh tungsten tailings micro powder.

3. The thin-layer masonry mortar according to claim 2, characterized in that, In step (3), the water content of the wet fine sand is 20%-30% after secondary cyclone dewatering and classification treatment, and 7%-10% after stockpiling and dewatering treatment.

4. The thin-layer masonry mortar according to claim 2, characterized in that, In step (4), the water content of the wet micro powder is 30%-40% after secondary cyclone dehydration and classification, and 12%-15% after pressure filtration.

5. The thin-layer masonry mortar according to claim 2, characterized in that, The temperature for drying in the fluidized bed oven is 400℃-600℃.

6. The method for preparing thin-layer masonry mortar based on all industrial solid waste as described in claim 1, characterized in that, The method includes: Industrial solid waste low-carbon cementitious materials and tungsten tailings sand aggregates are respectively fed into powder tanks using pneumatic equipment, and then transported to mixing mixers via metering pumps and horizontal screw conveyors. The mixtures are thoroughly mixed for 10 minutes. Admixtures are added from the feed port of the mixing mixer according to the mortar dosage, and then the mixtures are stirred for another 15 minutes to obtain the finished product.

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