Resourceful treatment method for building mixed garbage

Abstract

The invention provides a resourceful treatment method for mixed building garbage. The resourceful treatment method comprises the following steps: S1, providing the mixed building garbage; s2, first construction waste is separated from the construction mixed waste, wherein the first construction waste comprises broken bricks and concrete blocks; s3, the first construction waste is smashed, and second construction waste is obtained; uniformly mixing the second construction waste to obtain third construction waste; s4, the third construction waste, quartz sand, sodium carbonate, calcite and fluorite are jointly subjected to melting treatment, and molten liquid is obtained; carrying out annealing treatment on the melt, and cooling to obtain an intermediate product; and S5, heating the intermediate product to 650-680 DEG C, preserving heat for 1-2 hours, then heating to 850-900 DEG C, preserving heat for 1-2 hours, and cooling to obtain a final product. According to the invention, a large amount of construction wastes can be converted into high-valued building materials, and the obtained final product can be used as a high-grade building decoration material to replace stones such as marble, granite and the like.

Description

Technical Field

[0001] The present invention belongs to the field of building materials, and particularly relates to a method for resource treatment of construction mixed waste. Background Art

[0002] Currently, the city is in a stage of rapid development, and the corresponding construction waste is increasing unprecedentedly. If the construction waste is directly dumped or buried along open spaces, rivers, lakesides, mountain hideaways, etc., it not only destroys the environmental beauty, but also affects the city appearance and endangers human health, causing soil, groundwater and air pollution. Therefore, the resource utilization of construction waste is an important measure to solve the problems of high energy consumption, high pollution, high emissions and low efficiency, and is an important way to save land and resources. For example, classifying the construction waste and then crushing it through a crushing system, the recycled aggregate made from the crushed construction waste can be used as the aggregate for laying airport runways, and the construction waste can be utilized to a certain extent; however, the degree of resource utilization of the construction waste by this method is relatively low, and the value generated is not high, and the construction waste is not largely converted into high-value building materials.

[0003] The Chinese patent application with the publication number CN102219380A discloses a method for producing microcrystalline glass plates by using construction waste; its technical solution is: mixing the construction waste with ingredients evenly, and then adding them into a glass melting furnace to melt into glass liquid; flowing the melted glass liquid into water, and the glass liquid is quenched into glass particles by water, and the glass particle material is dried by a dryer; using a vibrating screen to classify the glass particle material by particle size; spreading the glass particles flat in a refractory mold; then sending the mold filled with materials into a furnace for sintering crystallization; finally, the sintered and crystallized plates are polished, polished and cut to become the finished products of microcrystalline glass. Although the above patent application uses construction waste to produce microcrystalline glass plates; however, the above patent application belongs to a method for applying construction waste to the production of microcrystalline glass by the sintering method, and it will inevitably generate pores inside, with low strength and poor overall performance.

[0004] In view of this, it is necessary to provide a method for resource treatment of construction mixed waste to solve or at least alleviate the technical problem of how to largely convert construction waste into high-value building materials. Summary of the Invention

[0005] The main object of the present invention is to provide a method for resource treatment of construction mixed waste, aiming to solve the above technical problem of how to largely convert construction waste into high-value building materials.

[0006] To achieve the above object, the present invention provides a method for resource treatment of construction mixed waste, including the steps of:

[0007] S1, providing construction mixed waste;

[0008] S2. Separate the first construction waste from the construction mixed waste, where the first construction waste includes broken bricks and concrete blocks;

[0009] S3. Crush the first construction waste to obtain the second construction waste; then, mix the second construction waste evenly to obtain the third construction waste;

[0010] S4. Melt the third construction waste and the admixture together to obtain a melt; then, anneal the melt and cool it to obtain an intermediate product;

[0011] The admixture includes quartz sand, soda ash, calcite, and fluorite; the mass ratio of the third construction waste, the quartz sand, the soda ash, the calcite, and the fluorite is 100:15 - 20:10 - 15:4 - 8:6 - 10;

[0012] S5. Crystallize the intermediate product and cool it to obtain the final product;

[0013] The crystallization treatment includes: heating the intermediate product to 650 - 680 °C and holding for 1 - 2 h, then heating to 850 - 900 °C and holding for 1 - 2 h.

[0014] Further, the construction mixed waste contains metal, organic matter, broken bricks, and concrete blocks.

[0015] Further, the particle size of the second construction waste is not larger than the aperture of a 24 - mesh sieve.

[0016] Further, the rotation speed of the even - mixing treatment is 10 - 20 revolutions per minute, and the duration of the even - mixing treatment is 20 - 30 minutes.

[0017] Further, the third construction waste contains silicon dioxide, aluminum oxide, calcium oxide, iron oxide, and magnesium oxide.

[0018] Further, by mass percentage, in the third construction waste, the content of silicon dioxide is 41 - 43%, the content of aluminum oxide is 7 - 9%, the content of calcium oxide is 30 - 32%, the content of magnesium oxide is 11 - 13%, and the content of iron oxide is 2 - 4%.

[0019] Further, the temperature of the melting treatment is 1400 - 1500 °C, and the heat - preservation duration of the melting treatment is 2 - 3 h.

[0020] Further, the temperature of the annealing treatment is 550 - 600 °C, and the heat - preservation duration of the annealing treatment is 1 - 2 h.

[0021] Further, when performing the annealing treatment, the melt is placed in a mold.

[0022] Further, the step S4 further includes: cutting the intermediate product.

[0023] Compared with the prior art, the present invention has at least the following advantages:

[0024] The present invention can convert a large amount of construction waste into high-value building materials. The final product obtained is microcrystalline glass with excellent overall performance, which can be used as high-grade building decoration materials to replace stones such as marble and granite. The present invention fully considers the influence of the types and components of construction waste on the final product, as well as the adaptability of processes such as melting, annealing, and crystallization to the technical system of the present invention. Therefore, the present invention selects broken bricks and concrete blocks from construction mixed waste, after crushing and mixing, is paired with specific additives, and then undergoes melting, annealing, and crystallization in a specific manner to obtain high-quality and high-value building materials, which can meet the requirements of high utilization rate of construction waste, low preparation energy consumption, and good product performance.

[0025] The present invention not only solves the problem of treating construction waste, but also provides a new type of high-grade decoration material for the market, with significant economic and social benefits. The present invention realizes a high utilization rate of construction waste by optimizing the formulation design, reduces the dependence on natural resources, and at the same time reduces the energy consumption in the preparation process. The final product of the present invention has excellent physical and chemical properties, such as high hardness, wear resistance, and corrosion resistance, meeting the high standards of building decoration materials. In the production process of the present invention, environmental protection factors are also considered, reducing the waste discharge in the production process, which conforms to the concept of sustainable development. Due to the wide sources of construction waste, the technical solution of the present invention has good adaptability and scalability, and can adapt to the treatment needs of construction waste in different regions. Detailed implementation manners

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0027] Moreover, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] When numerical ranges are given in the embodiments, it should be understood that unless otherwise specified in the present invention, both endpoints of each numerical range and any value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention, based on the understanding of those skilled in the art of the present technology field and the description of the present invention, any method, device, and material of the prior art similar or equivalent to those described in the embodiments of the present invention can also be used to implement the present invention.

[0029] The present invention provides a method for resource treatment of construction mixed waste, comprising the steps of:

[0030] S1, providing construction mixed waste.

[0031] It should be understood that the components in the construction mixed waste are complex and usually contain metals, organic matters, broken bricks, and concrete blocks; if the construction mixed waste is directly subjected to resource treatment, it will not only easily affect the quality of the final product, but also cause the component content in the reaction system to be unable to be effectively controlled; therefore, it is necessary to perform preliminary separation treatment on the construction mixed waste.

[0032] S2, separating a first construction waste from the construction mixed waste, and the first construction waste includes broken bricks and concrete blocks.

[0033] When the present invention separates the first construction waste, it will remove metals and organic matters in the construction mixed waste and retain broken bricks and concrete blocks. By using broken bricks and concrete blocks as the first construction waste, the present invention can ensure the components of the construction waste, thereby guaranteeing the quality of the final product.

[0034] S3, crushing the first construction waste to obtain a second construction waste; then, performing a mixing treatment on the second construction waste to obtain a third construction waste.

[0035] In the present invention, after the crushing treatment, the particle size of the second construction waste is not larger than the aperture of a 24-mesh sieve; alternatively, the product after the crushing treatment can be sieved to control the particle size of the second construction waste not to be larger than the aperture of a 24-mesh sieve.

[0036] In the present invention, by performing the crushing treatment and the mixing treatment, the component content of the third construction waste can be stabilized, thereby avoiding interference with the technical system of the present invention; in the present invention, the rotation speed of the mixing treatment is, the rotation speed of the mixing treatment is 10 - 20 revolutions per minute, and the duration of the mixing treatment is 20 - 30 minutes.

[0037] In the present invention, the third construction waste contains silicon dioxide, aluminum oxide, calcium oxide, iron oxide, and magnesium oxide. In terms of mass percentage and in the form of oxides, in the third construction waste, the content of silicon dioxide is 41-43%, the content of aluminum oxide is 7-9%, the content of calcium oxide is 30-32%, the content of magnesium oxide is 11-13%, and the content of iron oxide is 2-4%.

[0038] SiO 2 and Al 2 O 3 are the main components forming the silicate glass skeleton and are the basic substances of the glass-ceramics. In the glass composition, the increase in the content of SiO 2 and Al 2 O 3 will increase the melting and forming temperature of the glass, which is not conducive to the melting and forming of the glass. However, the increase in SiO 2 and Al 2 O 3 will reduce the crystallization tendency of the base glass, making the heat treatment system of the glass-ceramics easier to control, which is beneficial to obtaining a large number of small-sized grains. CaO and MgO belong to the glass network modifier oxides, and their functions in the glass are similar to those of the alkali metal oxides. They can provide "free oxygen", reduce the glass viscosity, and increase the crystallization tendency of the glass. However, due to the relatively high valence and small radius of Ca 2+ and Mg 2+ , their ionic potential is larger than that of the alkali metal oxides, so their oxygen extraction ability is greater than that of the alkali metal oxides. Fe 2 O 3 is the nucleating agent of the glass-ceramics. The Fe 3+ cation has a high charge and a strong electric field, which has a large agglomeration effect on the glass structure, can reduce the nucleation potential barrier of the glass, and enable the glass-ceramics to have the function of self-nucleation.

[0039] S4, subject the third construction waste and the admixture to melting treatment together to obtain a melt; then, subject the melt to annealing treatment and obtain an intermediate product after cooling.

[0040] In the present invention, the admixture includes quartz sand, soda ash, calcite, and fluorite; by introducing the quartz sand, the soda ash, the calcite, and the fluorite and matching them with the third construction waste, it is possible to form a glass-ceramics according to the ternary phase diagram of the CaO·Al 2 O 3 ·SiO 2 system glass-ceramics, so that SiO 2 , Al 2 O 3 and CaO in the glass-ceramics composition are selected in the main crystal phase CS phase region to form glass-ceramics.

[0041] In the present invention, the mass ratio of the third construction waste, the quartz sand, the soda ash, the calcite, and the fluorite is 100:15-20:10-15:4-8:6-10; by controlling the mass ratio of the third construction waste, the quartz sand, the soda ash, the calcite, and the fluorite, the combined action of various nucleating agents promotes the rapid precipitation of wollastonite crystals.

[0042] In the present invention, the temperature of the melting treatment is 1400-1500 °C, and the heat preservation duration of the melting treatment is 2-3 h; by controlling the temperature and duration of the melting treatment, there is sufficient time to ensure that the glass melt is fully melted and the composition is uniform.

[0043] In the present invention, the temperature of the annealing treatment is 550-600 °C, and the heat preservation duration of the annealing treatment is 1-2 h; by controlling the temperature and duration of the melting treatment, the stress in the glass can be eliminated.

[0044] In the present invention, during the annealing treatment, the melt is placed in a mold, so that the cooled intermediate product can be formed in the mold.

[0045] In the present invention, before the crystallization treatment, the intermediate product can be cut to obtain multiple intermediate products.

[0046] S5. Perform a crystallization treatment on the intermediate product, and obtain a final product after cooling; the crystallization treatment includes: heating the intermediate product at a rate of 3-5 °C / min to 650-680 °C and holding for 1-2 h, and then continuing to heat at a rate of 3-5 °C / min to 850-900 °C and holding for 1-2 h.

[0047] In the present invention, by holding at 650-680 °C for 1-2 h, a large number of crystal nuclei can be generated in the glass block; by holding at 850-900 °C for 1-2 h, the crystal nuclei in the glass block can grow, forming a large number of crystals, and the glass is interspersed among the crystals in a film shape.

[0048] In the present invention, after separating metals and organic matters from the construction mixed waste, the remaining brick residues and concrete blocks are crushed to an appropriate particle size and mixed evenly, which can be used as raw materials for making glass-ceramics, thereby replacing stones such as marble and granite as high-grade building decoration materials. Specifically, in the present invention, the broken bricks and concrete blocks in the construction waste are used as raw materials for glass-ceramics, and then melted and annealed with the quartz sand, the soda ash, the calcite, and the fluorite in specific proportions. After that, nucleation and crystal nucleus growth are carried out at a specific temperature to obtain glass-ceramics based on a large amount of construction waste. Based on this, in the present invention, the construction waste accounts for a large proportion in the raw materials of glass-ceramics, is disposed of quickly, saves the raw material cost, and disposes of the construction waste, and finally obtains a high-value building material.

[0049] The following are specific examples of the present invention:

[0050] Example 1

[0051] A resource treatment method for construction mixed waste, the steps of which are as follows:

[0052] S1, Obtain construction mixed waste, which contains metals, organic matters, broken bricks, and concrete blocks.

[0053] S2, Remove the metals and organic matters from the construction mixed waste, and retain the broken bricks and concrete blocks as the first construction waste.

[0054] S3, Crush the first construction waste, and after screening through a 24-mesh sieve, take the material under the sieve as the second construction waste; then, mix the second construction waste at 10 revolutions per minute for 30 minutes to obtain the third construction waste. The component analysis of the third construction waste is shown in Table 1.

[0055] Table 1 Component analysis of the third construction waste (wt%)

[0056] <![CDATA[SiO 2 > <![CDATA[Al 2 O 3 > CaO MgO <![CDATA[Fe 2 O 3 > Others 42 8 31 12 3 4

[0057] S4, Mix the third construction waste, quartz sand, soda ash, calcite, and fluorite according to the mass ratio in Table 2 to obtain a glass mixture.

[0058] Weigh 2500 g of the glass mixture, mix it evenly and place it in a 2000 mL corundum crucible, and melt it at 1430 °C for 2 h; quickly pour the melted glass liquid (molten liquid) into a preheated graphite mold, and keep it in an annealing furnace at 550 °C for 1 h for annealing; after cooling to room temperature with the furnace, obtain a glass sample (intermediate product), and cut it into 6 glass blocks of 100 mm × 100 mm.

[0059] Table 2 Mass ratio of the glass mixture

[0060] The third construction waste Quartz sand Soda ash Calcite Fluorite 100 18.5 12.8 4.3 7.1

[0061] S5. The obtained glass blocks after cutting are subjected to crystallization treatment, and after being cooled to room temperature in the furnace, the glass-ceramics are obtained.

[0062] In this embodiment, the process of the crystallization treatment is as follows: The obtained glass blocks (intermediate products) after cutting are heated to 650 °C at a rate of 3 °C / min for nucleation for 1 hour to generate a large number of crystal nuclei in the glass blocks; then, they are heated to 850 °C at a rate of 3 °C / min and held for 1 hour to grow the crystal nuclei in the glass blocks to form a large number of crystals, and the glass is interspersed among the crystals in a thin film shape.

[0063] Experimental results:

[0064] In this embodiment, the prepared glass-ceramics are subjected to physical and chemical tests, and the test results are shown in Table 3.

[0065] Table 3 Test results of glass-ceramics

[0066]

[0067] Example 2

[0068] Compared with Embodiment 1, in this embodiment, only the mass ratio of the third construction waste, quartz sand, soda ash, calcite, and fluorite is adjusted, and other conditions remain unchanged.

[0069] In this embodiment, the third construction waste, quartz sand, soda ash, calcite, and fluorite are mixed according to the mass ratio in Table 4.

[0070] Table 4 Mass ratio of glass mixture

[0071] The third construction waste Quartz sand Soda ash Calcite Fluorite 100 15 10 4 7

[0072] Experimental results:

[0073] In this embodiment, the prepared glass-ceramics are subjected to physical and chemical tests, and the test results are shown in Table 5.

[0074] Table 5 Test results of glass-ceramics

[0075]

[0076] Example 3

[0077] Compared with Embodiment 1, in this embodiment, only the mass ratio of the third construction waste, quartz sand, soda ash, calcite, and fluorite is adjusted, and other conditions remain unchanged.

[0078] In this embodiment, the third construction waste, quartz sand, soda ash, calcite, and fluorite are mixed according to the mass ratio in Table 6.

[0079] Table 6 Mixing ratio of glass mixture (wt%)

[0080] The third construction waste Quartz sand Soda ash Calcite Fluorite 100 18 12 5 8

[0081] Experimental results:

[0082] In this embodiment, the prepared glass-ceramics are subjected to physical and chemical tests, and the test results are shown in Table 7.

[0083] Table 7 Test results of glass-ceramics

[0084]

[0085] Example 4

[0086] Compared with Embodiment 1, this embodiment only adjusts the process of crystallization treatment, and other conditions remain unchanged.

[0087] In this embodiment, the process of crystallization treatment is as follows: The glass blocks obtained after cutting are heated to 650 °C at a rate of 5 °C / min for nucleation for 2 hours, and then heated to 860 °C at a rate of 3 °C / min and held for 2 hours.

[0088] Experimental results:

[0089] In this embodiment, the prepared glass-ceramics are subjected to physical and chemical tests, and the test results are shown in Table 8.

[0090] Table 8 Test results of glass-ceramics

[0091]

[0092] Comparative Example 1

[0093] Compared with Embodiment 1, this comparative example only adjusts the composition of the glass mixture, and other conditions remain unchanged.

[0094] In this comparative example, the glass mixture is mixed with the third construction waste, quartz sand, soda ash, calcite, fluorite, and zirconia according to the mass ratio in Table 9.

[0095] Table 9 Mass ratio of glass mixture

[0096] The third construction waste Quartz sand Soda ash Calcite Fluorite Zirconia 100 18 10 4 7 1

[0097] Experimental results:

[0098] In this comparative example, the prepared glass-ceramics are subjected to physical and chemical tests, and the test results are shown in Table 10.

[0099] Table 10 Detection Results of Glass-ceramics

[0100]

[0101] Comparative Example 2

[0102] In this comparative example compared with Example 1, only the crystallization process is adjusted, and other conditions remain unchanged.

[0103] In this comparative example, the crystallization process is as follows: The glass blocks obtained after cutting are heated to 880°C at a rate of 5°C / min and held for 2 hours.

[0104] Experimental results:

[0105] In this comparative example, the prepared glass-ceramics are subjected to physical and chemical tests, and the test results are shown in Table 11.

[0106] Table 11 Detection Results of Glass-ceramics

[0107]

[0108] Comparative Example 3

[0109] In this comparative example compared with Example 1, only the crystallization process is adjusted, and other conditions remain unchanged.

[0110] In this comparative example, the crystallization process is as follows: The glass blocks obtained after cutting are heated to 550°C at a rate of 10°C / min for nucleation for 3 hours, and then heated to 880°C at a rate of 10°C / min and held for 3 hours.

[0111] Experimental results:

[0112] In this comparative example, the prepared glass-ceramics are subjected to physical and chemical tests, and the test results are shown in Table 12.

[0113] Table 12 Detection Results of Glass-ceramics

[0114]

[0115] In the above technical solutions of the present invention, the above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made using the content of the specification of the present invention under the technical concept of the present invention, or direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A method for recycling mixed construction waste, characterized in that: Includes steps: S1, providing mixed construction waste; S2, separating first construction waste from the mixed construction waste, wherein the first construction waste includes broken bricks and concrete blocks; S3, crushing the first construction waste to obtain second construction waste; Then, the second construction waste is mixed and evenly treated to obtain third construction waste; S4, melting the third construction waste and the additive together to obtain a melt; then, annealing the melt and cooling it to obtain an intermediate product; The admixture includes quartz sand, soda ash, calcite, and fluorite; the mass ratio of the third construction waste, the quartz sand, the soda ash, the calcite, and the fluorite is 100:15-20:10-15:4-8:6-10; S5, performing crystallization treatment on the intermediate product, and obtaining a final product after cooling; The crystallization treatment comprises: heating the intermediate product to 650-680° C. and keeping the temperature for 1-2 hours, and then heating the intermediate product to 850-900° C. and keeping the temperature for 1-2 hours.

2. The method for recycling mixed construction waste according to claim 1, characterized in that: The mixed construction waste contains metals, organic matter, broken bricks and concrete blocks.

3. The method for recycling mixed construction waste according to claim 1, characterized in that: The particle size of the second construction waste is no greater than the aperture of a 24-mesh sieve.

4. The method for recycling mixed construction waste according to claim 1, characterized in that: The rotation speed of the mixing process is 10-20 revolutions per minute, and the duration of the mixing process is 20-30 minutes.

5. The method for recycling mixed construction waste according to claim 1, characterized in that: The third construction waste contains silicon dioxide, aluminum oxide, calcium oxide, iron oxide and magnesium oxide.

6. The method for recycling mixed construction waste according to claim 5, characterized in that: Calculated by mass percentage, the third construction waste contains 41-43% silicon dioxide, 7-9% aluminum oxide, 30-32% calcium oxide, 11-13% magnesium oxide and 2-4% iron oxide.

7. The method for recycling mixed construction waste according to claim 1, characterized in that: The temperature of the melting treatment is 1400-1500° C., and the insulation time of the melting treatment is 2-3 hours.

8. The method for recycling mixed construction waste according to claim 1, characterized in that: The temperature of the annealing treatment is 550-600° C., and the insulation time of the annealing treatment is 1-2 hours.

9. The method for recycling mixed construction waste according to claim 1, characterized in that: During the annealing treatment, the melt is placed in a mold.

10. The method for recycling mixed construction waste according to claim 1, characterized in that: The step S4 also includes: cutting the intermediate product.

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