Novel light partition wall batten with manganese slag as raw material and preparation method of novel light partition wall batten

Abstract

The invention provides a novel light partition wall batten with manganese slag as a raw material and a preparation method thereof.The preparation method comprises the following steps that S1, cement is used as a main raw material, micro mineral powder, manganese slag powder, heavy calcium carbonate powder, polyphenyl foam particles and additives are added, water is added, the materials are stirred and mixed to be uniform, and the additives comprise a water reducing agent, cellosilk and rubber powder; s2, performing casting molding on the uniformly mixed slurry through a mold; and S3, the formed green body is subjected to curing, demolding, curing and drying, and then the light partition wall batten is prepared. According to the lightweight partition wall batten prepared from the cement, the granulated blast furnace slag powder and the manganese slag powder according to a certain proportion, the fracture resistance and the compressive strength of the lightweight partition wall batten are higher than those of a partition wall batten prepared from the cement, the fly ash and the manganese slag powder; the environmental pressure caused by the solid waste can be relieved; and carbon emission reduction can be realized by means of source reduction, energy substitution and the like.

Description

Technical Field

[0001] The invention relates to the field of solid waste resource utilization, and in particular to a novel lightweight partition wall strip board using manganese slag as a raw material and a preparation method thereof. Background Art

[0002] Electrolytic manganese slag is an acidic solid waste particulate matter produced by electrolytic manganese production; according to statistics, my country currently discharges about 10 million tons of electrolytic manganese slag solid waste each year. At the same time, as the grade of manganese ore decreases, more electrolytic manganese slag will be produced. So far, the main way to deal with electrolytic manganese slag solid waste is to store it in a yard, which not only occupies land, but also contains metals such as Mn and Gd and harmful substances such as ammonia and nitrogen in the manganese slag, which will cause serious pollution to the environment. At the same time, environmental warming has a huge impact on the global environment; resource utilization of solid waste can not only reduce the environmental pressure brought by solid waste, but also achieve carbon emission reduction through source reduction and energy substitution.

[0003] Although electrolytic manganese slag contains metals such as Mn and Gd and harmful substances such as ammonia and nitrogen, its main chemical components are SiO2, S03, AI2O3, Fe2O3 and CaO, and its content exceeds 70%. The rational application of electrolytic manganese slag resources has very important practical significance. The resource utilization of electrolytic manganese slag mainly includes: 1. Extracting manganese metal elements again, 2. Preparing building materials and functional materials, and 3. Preparing agricultural fattening.

[0004] The applications of electrolytic manganese slag in building materials mainly include adjusting cement setting time, stimulating volcanic ash active minerals, backfilling roadbed in road projects, and making unburned bricks; its usage is limited in application, and the potential advantages of electrolytic manganese slag have not been fully utilized. Summary of the invention

[0005] The purpose of the present invention is to provide a novel lightweight partition wall strip board using manganese slag as raw material and a preparation method thereof, so as to solve the problems existing in the above-mentioned prior art.

[0006] In order to solve the above problems, the first aspect of the present invention provides a method for preparing a new type of lightweight partition wall strip using manganese slag as raw material, comprising the following steps: S1, using cement as the main raw material, adding micro-mineral powder, manganese slag powder, heavy calcium powder, polystyrene foam particles and admixtures, and adding water to stir and mix, wherein the admixtures include water reducer, cellulose and dispersant; S2, casting the mixed slurry through a mold; S3, the green body after molding is solidified, demolded, cured and dried to obtain a lightweight partition wall strip.

[0007] In one embodiment, in step S1, by weight, there are 100 parts of cement, 10 to 17 parts of fine mineral powder, 45 to 65 parts of electrolytic manganese slag, 30 to 35 parts of heavy calcium powder, and 1.5 to 2 parts of polystyrene foam particles.

[0008] In one embodiment, the fine mineral powder is granulated blast furnace slag powder.

[0009] In one embodiment, the manganese slag powder is obtained by low-temperature calcination, desulfurization and denitrification of electrolytic manganese slag, and its particle size is ≤16 mm.

[0010] In one embodiment, the heavy calcium powder is a white powder with a mesh size of 325 to 400.

[0011] In one embodiment, the particle size of the polystyrene foam particles is 2.36 mm to 9 mm.

[0012] In one embodiment, the electrolytic manganese slag sieve bottom contains 4% to 7% fine powder, and the remaining particles have a particle size range of 0.075 mm to 16 mm.

[0013] In one embodiment, the particle size of the fine powder is 200-400 mesh.

[0014] In one embodiment, in step S1, by weight, there are 300 parts of cement, 50 parts of fine mineral powder, 150 parts of electrolytic manganese slag, 100 parts of heavy calcium powder, 5 parts of polystyrene foam particles, 5 parts of water reducer, 1.2 parts of fiber filaments, 2.2 parts of rubber powder, and 175 parts of water.

[0015] The second aspect of the present invention provides a novel lightweight partition wall strip made of manganese slag as raw material, which is obtained by the above-mentioned preparation method.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] 1. The flexural and compressive strengths of cement, granulated blast furnace slag powder and manganese slag powder prepared in a certain proportion are higher than those of cement, fly ash and manganese slag powder.

[0018] 2. When the added granulated blast furnace slag powder and electrolytic manganese slag powder are within a certain ratio range, under the action of cement base and electrolytic manganese slag, it can accelerate the formation of CSH gel and AFT crystals in the hydration products of volcanic ash mineral active materials and improve the early strength of the mixture.

[0019] 3. Adding 30% to 35% of heavy calcium powder to the cement mass can effectively control the problems of poor fluidity and increased water demand.

[0020] 4. The cement hydration reaction products (such as CSH gel, etc.) can continue to adsorb water-soluble Mn2+ ions in electrolytic manganese slag, and easily convert the solidified water-soluble Mn2+ into insoluble and low-toxic Mno2, reducing the Mn2+ leaching rate and further reducing the harm of Mn2+ to the environment. DETAILED DESCRIPTION

[0021] The embodiments of the present application are described in detail below.

[0022] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0023] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0024] It should also be noted that the following embodiments only illustrate the basic concept of the present application in a schematic manner. During actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0025] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0026] Example

[0027] By recycling electrolytic manganese slag solid waste, we can not only reduce the environmental pressure caused by solid waste, but also achieve carbon emission reduction through source reduction and energy substitution. The physical form of electrolytic manganese slag is black granular solid (the particle size range is generally 0.075mm to 16mm, and contains about 4% to 7% fine powder); manganese slag has strong water absorption, and the bulk density is >1100kg / m 3 , apparent density>2000kg / m 3Its unique physical properties have an adverse effect on its use in lightweight partition boards, such as the control of wallboard surface density, the loss of mixture fluidity during the production process, and the quality defects of cracking and honeycombing caused by water loss.

[0028] In order to overcome the adverse effects of the use of the above-mentioned manganese slag in lightweight partition boards, the applicant has conducted a large number of experiments, utilizing the chemical composition of Sio2, S03, AI203, Fe203 and CaO in the electrolytic manganese slag and the physical properties of the electrolytic manganese slag itself, and combining the physicochemical properties of cement-based materials and volcanic ash active minerals, to cause a series of physical and chemical reactions between the electrolytic manganese slag and the cement-based and volcanic ash active minerals. Under the action of the cement-based and electrolytic manganese slag, the formation of CSH gel and AFT crystals in the hydration products of the volcanic ash mineral active materials is accelerated, while the volume of the slurry can be made more compact, the strength and durability of the mortar are improved, the physical and mechanical performance requirements of the lightweight partition wall title for construction are achieved, and the conditions for mass production are met.

[0029] During a large number of test comparisons, the applicant found that when the fine powder contained in electrolytic manganese slag is used as a mixture to conduct cement mortar strength tests, the flexural load and compressive strength of cement plus granulated blast furnace slag powder and manganese slag powder prepared in a certain proportion are higher than those of cement plus fly ash and manganese slag powder.

[0030] However, with the addition of manganese slag powder, the fluidity of the mortar becomes worse, and the water requirement increases. Therefore, the inert components contained in the manganese slag powder have a great influence on the fluidity and water requirement of the mortar. In order to overcome the above-mentioned drawbacks, the applicant has found through a large number of experimental comparisons that when 10% to 15% of the mass of cement granulated blast furnace slag powder is added, under the action of cement base and electrolytic manganese slag, it can accelerate the formation of CSH gel and AFT crystals in the hydration products of volcanic ash mineral active materials, and improve the early strength of the mixture. Adding 10% to 20% of the mass of cement micro-mineral powder can also stimulate the secondary hydration reaction of cement, and the manganese slag can stimulate the activity of micro-minerals.

[0031] Furthermore, adding 30% to 35% of heavy calcium powder to the mass of cement can effectively control the problems of poor fluidity and increased water demand, and adding some admixtures (such as water reducer, cellulose and glue powder) can optimize the performance of the mixture to meet the industrial requirements of lightweight partition board production and casting; at the same time, the cement hydration reaction products (such as CSH gel, etc.) can continue to adsorb water-soluble Mn2+ ions in the electrolytic manganese slag, and easily convert the solidified water-soluble Mn2+ into insoluble and low-toxic Mno2, reducing the Mn2+ leaching rate and further reducing the harm of Mn2+ to the environment.

[0032] The applicant designed the formula based on the various index requirements for lightweight partition boards for construction, and the main materials used include: cement, micro-mineral powder, electrolytic manganese slag, heavy calcium powder and polystyrene foam particles.

[0033] The embodiment provides a method for preparing a novel lightweight partition wall strip using manganese slag as raw material, comprising the following steps: S1, using cement as the main raw material, adding micro-mineral powder, manganese slag powder, heavy calcium powder, polystyrene foam particles and admixtures, and adding water to stir and mix, wherein the admixtures include water reducer, cellulose and glue powder; S2, casting the mixed slurry through a mold; S3, the green body after molding is solidified, demolded, cured and dried to obtain a lightweight partition wall strip.

[0034] In one embodiment, in step S1, by weight, there are 100 parts of cement, 10 to 17 parts of fine mineral powder, 45 to 65 parts of electrolytic manganese slag, 30 to 35 parts of heavy calcium powder, and 1.5 to 2 parts of polystyrene foam particles.

[0035] In one embodiment, the fine mineral powder is granulated blast furnace slag powder.

[0036] In one embodiment, the manganese slag powder is obtained by low-temperature calcination, desulfurization and denitrification of electrolytic manganese slag, and its particle size is ≤16 mm.

[0037] In one embodiment, the heavy calcium powder is a white powder with a mesh size of 325 to 400.

[0038] In one embodiment, the particle size of the polystyrene foam particles is 2.36 mm to 9 mm.

[0039] In one embodiment, the electrolytic manganese slag sieve bottom contains 4% to 7% fine powder, and the remaining particles have a particle size range of 0.075 mm to 16 mm.

[0040] In one embodiment, the particle size of the fine powder is 200-400 mesh.

[0041] In one embodiment, in step S1, by weight, there are 300 parts of cement, 50 parts of fine mineral powder, 150 parts of electrolytic manganese slag, 100 parts of heavy calcium powder, 5 parts of polystyrene foam particles, 5 parts of water reducer, 1.2 parts of fiber filaments, 1.2 parts of composite material, 2.2 parts of rubber powder, and 175 parts of water.

[0042] Among them, the cement is P.042.5; the micro-mineral powder is granulated blast furnace slag powder; the electrolytic manganese slag is treated by low-temperature calcination, desulfurization and denitrification, and the heavy metal content meets the requirements of relevant standards and specifications, and its particle size is ≤16m (containing 4% to 7% fine powder); the heavy calcium powder is 325 mesh to 400 mesh, grade I white; the particle size of the polystyrene foam particles is 2.36mm to 9mm.

[0043] The electrolytic manganese slag sieve bottom contains 4% to 7% fine powder (200 mesh to 400 mesh), and the remaining particles have a particle size range of 0.075mm to 16mm; 0.075mm-16mm particles replace aggregates, and 200 mesh to 400 mesh fine powder is used as a rubbing material to replace part of the cementitious material.

[0044] The ideal formula obtained through experiments is: by weight, 300 parts of cement, 50 parts of micro-mineral powder, 150 parts of electrolytic manganese slag, 100 parts of heavy calcium powder, 5 parts of polystyrene foam particles, 5 parts of water reducer, 1.2 parts of fiber, 1.2 parts of composite material, 2.2 parts of rubber powder, and 175 parts of water. Because manganese slag has strong water absorption, hydrocarbon methyl propyl cellulose can be used instead of rubber powder.

[0045] The embodiment also provides a novel lightweight partition wall strip using manganese slag as raw material, and the novel lightweight partition wall strip using manganese slag as raw material is obtained by the above-mentioned preparation method. Trial production is carried out according to the above-mentioned material proportions, and the performance of the mixture meets the production process requirements. After demoulding, the three specifications of 90mm, 150mm and 200mm lightweight partition wall strips are randomly sampled and tested according to the relevant provisions of GB / T23451-2023, and its various test indicators meet the requirements.

[0046] Example 1

[0047] A method for preparing a novel lightweight partition wall strip board using manganese slag as raw material comprises the following steps:

[0048] S1. Prepare the following raw materials by weight: 300 parts of cement, 50 parts of micro-mineral powder, 150 parts of electrolytic manganese slag, 100 parts of heavy calcium powder, 5 parts of polystyrene foam particles, 5 parts of water reducer, 1.2 parts of fiber filaments, 1.2 parts of composite material, 2.2 parts of rubber powder, and 175 parts of water;

[0049] The water reducing agent is lignin sulfonate, the fiber is polypropylene (PP), the composite material is ceramsite composite material 720-D, and the rubber powder is dispersible latex powder;

[0050] S2, casting the mixed slurry through a mold;

[0051] S2-1. Add materials to the mixing system (180-type horizontal twin-shaft mixer) and pre-mix the dry materials (mix evenly) and then add water (or water and water-reducing agent solution) for wet mixing (mixing time 3min to 4min);

[0052] S2-2, after being stirred evenly, the mixture is sent to the material distribution table through a pumping device (the pumping pressure is 400KPa to 800KPa) for pouring and molding;

[0053] S3. After the green body is formed, it is cured, demoulded and cured to obtain lightweight partition wall strips. The green body is put into the curing workshop for 36 to 48 hours, and natural curing is adopted in summer and the curing temperature is 15 to 25°C in winter; or heating curing is adopted (heating curing conditions are: heating rate ≤15°C / h, 50°C±5°C; constant temperature 2 to 3h, humidity: 90%±5%), cooling rate ≤15°C / h; moisturizing curing is carried out for 3 to 5 days.

[0054] After testing, the dry density of the lightweight partition board after 28 days is between 750 and 820, the compressive strength after 28 days is between 3.4 MPa and 4.0 MPa, and the bending load: tested with 120mm thick plates, the load value is >1.5 times the weight of the board itself; indicators such as hanging force and impact resistance meet the technical indicator requirements of relevant clauses of GB / T23451 and GB / T23450.

[0055] Example 2

[0056] A method for preparing a novel lightweight partition wall strip board using manganese slag as raw material comprises the following steps:

[0057] S1. Prepare the raw materials by weight: 100 parts of cement, 15 parts of micro-mineral powder, 45 parts of electrolytic manganese slag, 20 parts of heavy calcium powder, 1.5 parts of polystyrene foam particles, 1.6 parts of water reducer, 0.4 parts of fiber filaments, 0.4 parts of composite materials, 0.7 parts of rubber powder, and 100 parts of water, wherein the water reducer is lignin sulfonate, the fiber filaments are polypropylene (PP), the composite material is ceramsite composite material 720-D, and the rubber powder is dispersible latex powder;

[0058] Steps S2 and S3 are the same as those in Example 1.

[0059] After testing, the dry density of the lightweight partition board after 28 days is between 750 and 820, the compressive strength after 28 days is between 2.4 MPa and 3.8 MPa, and the bending load: tested with 120 mm thick plates, the load value is >1.5 times the weight of the board itself); indicators such as hanging force and impact resistance meet the technical indicator requirements of relevant clauses of GB / T23451 and GB / T23450.

[0060] Comparative Example 1

[0061] A method for preparing a novel lightweight partition wall strip board using manganese slag as raw material comprises the following steps:

[0062] S1. Prepare the following raw materials by weight: 300 parts of cement, 25 parts of fly ash, 150 parts of electrolytic manganese slag, 100 parts of heavy calcium powder, 5 parts of polystyrene foam particles, 5 parts of water reducer, 1.2 parts of fiber filaments, 1.2 parts of composite materials, 2.2 parts of rubber powder, and 100 parts of water, wherein the water reducer is lignin sulfonate, the fiber filaments are polypropylene (PP), the composite material is ceramsite composite material 720-D, and the rubber powder is dispersible latex powder;

[0063] Steps S2 and S3 are the same as those in Example 1.

[0064] After testing, the dry density of the lightweight partition board is between 750 and 820, the compressive strength is 2.0~2.5MPa, and the bending load: tested with 120㎜ thick plates, the load value is ≤1.5 times the weight of the board itself; it does not meet the technical index requirements of the relevant clauses of GB / T23451 and GB / T23450.

[0065] The difference between Example 2 of the present invention and Example 1 is that Example 1 adds 30% to 35% of the mass of cement heavy calcium powder, which can effectively control the problems of poor fluidity and increased water demand, while Example 2 uses less heavy calcium powder and more water, and its 28-day compressive strength is between 2.4 MPa and 3.8 MPa.

[0066] Compared with comparative example 1, the lightweight partition wall strips prepared by cement, granulated blast furnace slag powder and manganese slag powder in a certain proportion in embodiment 1 have higher bending load and compressive strength than the lightweight partition wall strips prepared by cement, fly ash and manganese slag powder in comparative example 1. At the same time, the construction performance of the mixture after uniform mixing is superior to that of comparative example 1.

[0067] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for preparing a novel lightweight partition board using manganese slag as raw material, characterized in that: The steps include: S1. Use cement as the main raw material, add micro-mineral powder, manganese slag powder, heavy calcium powder, polystyrene foam particles and admixtures, add water and stir to mix, wherein the admixtures include water reducing agent, fiber and rubber powder; S2, casting the mixed slurry through a mold; S3. The green body after forming is solidified, demoulded, cured and dried to obtain lightweight partition wall panels.

2. The preparation method according to claim 1, characterized in that: In step S1, by weight, 100 parts of cement, 10 to 17 parts of micro-mineral powder, 45 to 65 parts of electrolytic manganese slag, 30 to 35 parts of heavy calcium powder, and 1.5 to 2 parts of polystyrene foam particles are used.

3. The preparation method according to claim 1, characterized in that: The micro mineral powder is granulated blast furnace slag powder.

4. The preparation method according to claim 1, characterized in that: The manganese slag powder is obtained by low-temperature calcination, desulfurization and denitrification of electrolytic manganese slag, and its particle size is ≤16mm.

5. The preparation method according to claim 1, characterized in that: The heavy calcium powder is a white powder with a mesh size of 325 to 400.

6. The preparation method according to claim 1, characterized in that: The particle size of the polystyrene foam particles is 2.36 mm to 9 mm.

7. The preparation method according to claim 4, characterized in that: The electrolytic manganese slag sieve bottom contains 4% to 7% of fine powder, and the remaining particles have a particle size range of 0.075 mm to 16 mm.

8. The preparation method according to claim 7, characterized in that: The particle size of the fine powder is 200-400 meshes.

9. The preparation method according to claim 1, characterized in that: In step S1, by weight, there are 300 parts of cement, 50 parts of fine mineral powder, 150 parts of electrolytic manganese slag, 100 parts of heavy calcium powder, 5 parts of polystyrene foam particles, 5 parts of water reducer, 1.2 parts of fiber filaments, 2.2 parts of rubber powder, and 175 parts of water.

10. A new type of lightweight partition board made of manganese slag, characterized in that: A novel lightweight partition board using manganese slag as raw material obtained by the preparation method described in any one of claims 1 to 9.