Burning-free and steaming-free brick and preparation method thereof

Abstract

The invention provides a baking-free and steaming-free brick and a preparation method thereof, and the baking-free and steaming-free brick comprises the following components in percentage by weight: 70-80% of alaite type high-purity quartz production tail mud, 10-15% of quick lime and 10-15% of cement. The preparation method of the baking-free and steaming-free brick comprises the following steps: mixing the following components in percentage by weight: 70-80% of alaite type high-purity quartz production tail mud, 10-15% of quick lime and 10-15% of cement; the mixed materials are subjected to aging; carrying out compression molding on the aged material to obtain a green brick; and naturally curing the green brick to obtain the baking-free and steaming-free brick. The method has the beneficial effects that the tail mud produced from the alaite type high-purity quartz raw material can be turned into wealth from waste, the problems of stacking and post-treatment of the tail mud are solved, ball milling is not needed, direct batching can be realized, the process is simple and convenient, and the cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of building material manufacturing, and specifically, to a non-fired and non-steamed brick and a preparation method thereof. Background Art

[0002] High-purity quartz (SiO2 purity above 99.99%) is an important functional material with excellent physical and chemical properties such as high temperature resistance, corrosion resistance, high strength, high light transmittance, and low thermal expansion coefficient. It is widely used in high-end technology industries such as semiconductor chips, solar photovoltaics, optical fiber communication, aerospace, precision optics, and special glass. High-purity quartz was initially processed from first- and second-grade quartz crystals. With the gradual depletion of quartz crystal resources, at present, high-purity quartz sand, especially high-purity quartz above 4N8, is mainly separated and purified from alaskite, and quartz in alaskite only accounts for 20-30%.

[0003] With the rapid development of the high-purity quartz sand industry, a large amount of alaskite-type high-purity quartz raw materials need to be mined and utilized. A large amount of production tail mud is generated during the production process of high-purity quartz sand. The random stacking of tail mud not only occupies land resources but also poses potential production safety and environmental protection accident hazards, seriously affecting the safety of people's lives and property, greatly wasting mineral resources, and damaging the ecological environment.

[0004] At present, there is no utilization method for the production tail mud of alaskite-type high-purity quartz raw materials. If the production tail mud of alaskite-type high-purity quartz raw materials can be used to make non-fired and non-steamed bricks, it will promote the development of the high-purity quartz sand industry and have positive economic and social environmental benefits. Therefore, it is of great significance to provide a non-fired and non-steamed brick prepared by using the production tail mud of alaskite-type high-purity quartz and a preparation method thereof. Summary of the Invention

[0005] The purpose of the present invention is to solve at least one of the above-mentioned deficiencies existing in the prior art. For example, one of the purposes of the present invention is to provide a non-fired and non-steamed brick with high strength and capable of effectively using the production tail mud of alaskite-type high-purity quartz. Another purpose of the present invention is to provide a preparation method for non-fired and non-steamed bricks with simple process and low cost.

[0006] To achieve the above purpose, on the one hand, the present invention provides a non-fired and non-steamed brick, which may include: by weight percentage, 70-80% of the production tail mud of alaskite-type high-purity quartz, 10-15% of quicklime, and 10-15% of cement.

[0007] According to one or more exemplary embodiments of one aspect of the present invention, the particle size of the production tail mud of alaskite-type high-purity quartz may be below 0.075 mm.

[0008] According to one or more exemplary embodiments of one aspect of the present invention, the mineral composition of the tail mud produced from the production of high-purity quartz from syenite mainly may include plagioclase, potassium feldspar, quartz, and muscovite.

[0009] Another aspect of the present invention provides a preparation method for non-fired and non-steamed bricks, and the preparation method may include: by weight percentage, mixing 70-80% of the tail mud produced from the production of high-purity quartz from syenite, 10-15% of quicklime, and 10-15% of cement; aging the mixed material; pressing the aged material into a brick blank; and naturally curing the brick blank to obtain non-fired and non-steamed bricks.

[0010] According to one or more exemplary embodiments of one aspect of the present invention, the mixing may include: maintaining a moisture content of 10-15% and stirring evenly.

[0011] According to one or more exemplary embodiments of one aspect of the present invention, the aging may include: placing for 30-40 min, undergoing a hydration reaction, and the generated hydration products cementing with the tail mud particles of the high-purity quartz from syenite to form a framework structure.

[0012] According to one or more exemplary embodiments of one aspect of the present invention, the hydration products may include calcium silicate hydrate and calcium aluminate hydrate.

[0013] According to one or more exemplary embodiments of one aspect of the present invention, the pressing into shape may include: maintaining a molding pressure of 15-25 MPa and performing pressing into shape in a non-fired brick machine.

[0014] According to one or more exemplary embodiments of one aspect of the present invention, the natural curing may include: curing the pressed brick blank at room temperature in a curing area for 7-15 days.

[0015] According to one or more exemplary embodiments of one aspect of the present invention, the preparation method may further include: inspecting the cured sample, and the inspection includes dimensions, appearance, water absorption rate, frost resistance, and strength, to obtain non-fired and non-steamed bricks that meet JC / T 422-2007 "Non-sintered Waste Tailings Bricks".

[0016] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0017] (1) The non-fired and non-steamed bricks proposed by the present invention have a simple and natural appearance, can be used as fair-faced walls or for any exterior decoration, have environmental protection significance, and conform to the circular economy development model.

[0018] (2) The preparation method of the non-fired and non-steamed bricks proposed by the present invention can turn the tail mud produced from the production of high-purity quartz raw materials into treasures, solve the problems of tail mud stacking and post-treatment, do not require ball milling during the process, can directly prepare the ingredients, the preparation process is simple, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 FIG. shows a schematic flow chart of a method for preparing a non-fired and non-steamed brick according to an exemplary embodiment of the present invention;

[0021] Figure 2A FIG. shows a schematic structural diagram of a non-fired and non-steamed brick according to an exemplary embodiment of the present invention;

[0022] Figure 2B FIG. shows another schematic structural diagram of a non-fired and non-steamed brick according to an exemplary embodiment of the present invention;

[0023] Figure 3A FIG. shows the test result graph of a laser particle size analyzer for the tail mud produced from the production of white granite type high-purity quartz raw materials of the present invention;

[0024] Figure 3B FIG. shows the composition detection spectrum of the tail mud produced from the production of white granite type high-purity quartz raw materials of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Hereinafter, a non-fired and non-steamed brick and a method for preparing the same according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0026] Exemplary Embodiment 1

[0027] The present exemplary embodiment provides a method for preparing a non-fired and non-steamed brick.

[0028] Figure 1 FIG. shows a schematic flow chart of a method for preparing a non-fired and non-steamed brick according to an exemplary embodiment of the present invention. The following will be described in conjunction with Figure 1 to describe the method for preparing the non-fired and non-steamed brick of the present exemplary embodiment.

[0029] As Figure 1 shown, the method for preparing the non-fired and non-steamed brick mainly includes: mixing 70-80% tail mud (tail mud produced from the production of white granite type high-purity quartz), 10-15% cement and 10-15% quicklime, while maintaining a certain moisture content of 10-15%, aging for 30-40 minutes, then pressing into shape (maintaining a forming pressure of 15-25 MPa), performing natural curing for 7-15 days, and finally, finished product inspection can be carried out to inspect the size, outer skin and strength, and non-fired and non-steamed bricks meeting the expectations can be selected.

[0030] Specifically, the method for preparing the non-fired and non-steamed brick of the present exemplary embodiment may include the following steps:

[0031] S1. Determine the raw material ratio.

[0032] In the present invention, the raw materials are in weight ratio, including 70 - 80% of the tailings from the production of white granite type high-purity quartz, 10 - 15% of quicklime, and 10 - 15% of cement.

[0033] S2. Mix the materials.

[0034] Send the raw materials prepared in step S1 to a mixer by a feeding machine, keep the moisture content at 10 - 15%, and stir vigorously and evenly.

[0035] S3. Aging.

[0036] Place the materials stirred evenly in step S2 for 30 - 40 minutes, allowing the effective calcium oxide in quicklime, cement and SiO2, Al2O3 in the tailings to undergo a hydration reaction to form hydrates with a certain strength. The hydrates are cemented together with the tailings particles to form a framework structure, thereby increasing the strength of the bricks made.

[0037] S4. Press into shape.

[0038] Send the materials aged in step S3 to a non-fired brick machine by a belt, select a mold, keep the molding pressure at 15 - 25 MPa, and press into shape.

[0039] S5. Natural curing.

[0040] Send the pressed brick blanks in step S4 to a curing area for natural curing (normal temperature curing) for 7 - 15 days to obtain non-fired and non-steamed bricks.

[0041] In this exemplary embodiment, in step S1, the particle size of the tailings from the production of white granite type high-purity quartz raw materials is below 0.075 mm. The main mineral components of the tailings include quartz, feldspar and mica. Further, among them, 40 - 62% is plagioclase, 5 - 12% is potassium feldspar, 15 - 30% is quartz, and 5 - 12% is muscovite; the main chemical components are 65 - 80% SiO2, 10 - 15% Al2O3, 1 - 10% K2O, 1 - 10% Na2O, 0.01 - 2% Fe2O3, 0.01 - 2% CaO and 0.01 - 1% P2O5. For example, it can be 79.87% SiO2, 10.91% Al2O3, 3.01% K2O, 6.31% Na2O, 0.81% Fe2O3, 0.38% CaO and 0.146% P2O5.

[0042] In this exemplary embodiment, in step S3, the effective calcium oxide in quicklime, which can be abbreviated as "effective calcium", refers to the part of calcium oxide with hydration activity that can rapidly hydrolyze to form calcium hydroxide (slaked lime). The active calcium oxide in quicklime is not less than 70%, and in high-quality quicklime, the active calcium oxide is more than 90%.

[0043] Among them, the reaction equation of effective calcium and SiO2 can be:

[0044] xCaO + SiO2 + (x + 1)H2O = xCaO·SiO2·(x + 1)H2O.

[0045] The reaction equation of effective calcium and Al2O3 can be:

[0046] CaO + Al2O3 + 7H2O = CaO·Al2O3·7H2O.

[0047] In this exemplary embodiment, in step S3, the hydrates formed by hydration may include calcium silicate hydrate and calcium aluminate hydrate.

[0048] Further, the main components in the tail mud are SiO2 and Al2O3, and the hydrates are mainly calcium silicate hydrate and calcium aluminate hydrate. Some other components in the raw materials will also form hydrates, but their contents are low. For example, the gypsum component contained in cement will generate calcium sulfoaluminate hydrate during the hydration process, generally 3 - 5% of the gypsum in the cement.

[0049] The skeleton structure formed in step S3 is mainly different from the substances formed by conventional hydration cementation in terms of the porosity of the skeleton. The tail mud produced from leucogranite - type high - purity quartz raw materials is finer, with a particle size below 0.075 mm, which can fill the voids between cement particles, reduce the porosity of the skeleton structure, and make the structure more dense.

[0050] In this exemplary embodiment, in step S5, the conditions for natural curing may include a temperature between 15 - 25°C, a humidity preferably reaching more than 90%, keeping the air properly circulated, and avoiding direct sunlight.

[0051] In this exemplary embodiment, the preparation method of the autoclave - free and steam - free brick may further include step S6, and step S6 includes: finished product inspection. Specifically, the finished bricks cured in step S5 can be inspected to check whether their dimensions, appearance, strength, etc. meet the expected standards, and they can be packaged for storage and sales. Approximately 70 - 95% of the bricks obtained after curing meet the expectations.

[0052] In this exemplary embodiment, the autoclave - free and steam - free brick is a brick hardened by natural curing at room temperature without high - temperature calcination and steam curing. The present invention uses the tail mud produced from leucogranite - type high - purity quartz raw materials as the main raw material, and can refer to the requirements of JC / T 422—2007 "Non - sintered Garbage Tailings Bricks".

[0053] Exemplary embodiment 2

[0054] This exemplary embodiment provides an autoclave - free and steam - free brick.

[0055] Figure 2A Shows the structural schematic diagram of the non-fired and non-steamed brick of an exemplary embodiment of the present invention; Figure 2B Shows another structural schematic diagram of the non-fired and non-steamed brick of an exemplary embodiment of the present invention;

[0056] Figure 3A Shows the test result diagram of the laser particle size analyzer of the tail mud produced from the granite-type high-purity quartz raw material of the present invention; Figure 3B Shows the composition detection spectrum of the tail mud produced from the granite-type high-purity quartz raw material of the present invention. The following will be combined with Figures 2A to 3B to describe the non-fired and non-steamed brick of this exemplary embodiment.

[0057] The non-fired and non-steamed brick of this exemplary embodiment may include the product prepared by the preparation method of the non-fired and non-steamed brick described in the above exemplary embodiment 1.

[0058] In this exemplary embodiment, the particle size of the tail mud produced from the granite-type high-purity quartz is below 0.075 mm, and the test result of the laser particle size analyzer of this tail mud is as Figure 3A shown.

[0059] In this exemplary embodiment, the main mineral components of the tail mud produced from the granite-type high-purity quartz include quartz, feldspar and mica. As Figure 3B shown, the mineral composition of the tail mud mainly includes plagioclase, potassium feldspar, quartz and mica. Specifically, the mineral composition includes 56% plagioclase, 11% potassium feldspar, 20% quartz and 13% muscovite.

[0060] Furthermore, the main chemical components of the tail mud are 79.87% SiO2, 10.91% Al2O3, 3.01% K2O, 6.31% Na2O, 0.81% Fe2O3, 0.38% CaO and 0.146% P2O5.

[0061] In this exemplary embodiment, the appearance, size, strength, etc. of the non-fired and non-steamed brick can refer to the requirements of JC / T422—2007 "Non-fired Waste Tailings Brick". As Figure 2A and Figure 2B shown, the non-fired and non-steamed brick has standard size, complete shape and uniform color.

[0062] In order to better understand the above exemplary embodiment of the present invention, the following will further illustrate it with specific examples.

[0063] Example 1

[0064] S1. Raw material ratio.

[0065] The raw materials are in weight ratio, which includes 75% of the tail mud produced from the granite-type high-purity quartz, 12% of quicklime and 13% of cement.

[0066] S2. Mixing materials.

[0067] Send the raw materials prepared in step S1 to a blender by a feeding machine, maintain a moisture content of 13%, and stir vigorously until evenly mixed.

[0068] S3. Aging.

[0069] Place the evenly mixed materials in step S2 for 30 minutes to allow the effective calcium oxide, cement, and SiO2 and Al2O3 in the tail mud to undergo a hydration reaction to generate hydrates with a certain strength, mainly calcium silicate hydrate and calcium aluminate hydrate. The two hydration products are cemented together with the tail mud particles to form a framework structure, thereby increasing the strength of the bricks produced.

[0070] S4. Compression molding.

[0071] Send the aged materials in step S3 to a non-fired brick machine by a belt conveyor, select a mold, maintain a molding pressure of 20 MPa, and perform compression molding.

[0072] S5. Natural curing.

[0073] Send the pressed brick blanks in step S4 to a curing area, maintain the temperature between 18 and 23 °C, maintain the humidity above 90%, keep the air flowing properly, avoid direct sunlight, and cure for 10 days.

[0074] S6. Final product inspection.

[0075] Inspect the final product bricks (non-fired and non-steamed bricks) cured in step S5, check their appearance for integrity, test their water absorption rate at 14.3%, their strength reaching 19.4 MPa, their strength after freezing at 14.7 MPa, and their dry mass loss at 0.8%, meeting the MU15 standard.

[0076] Example 2

[0077] S1. Raw material ratio.

[0078] The raw materials are in a weight ratio, including 80% of the tail mud from the production of white granite type high-purity quartz, 10% of quicklime, and 10% of cement.

[0079] S2. Mixing materials.

[0080] Send the raw materials prepared in step S1 to a blender by a feeding machine, maintain a moisture content of 15%, and stir vigorously until evenly mixed.

[0081] S3. Aging.

[0082] Leave the material after being evenly stirred in step S2 for 30 minutes to allow the effective calcium oxide, cement, and SiO2 and Al2O3 in the tail mud to undergo a hydration reaction to generate hydrates with a certain strength, mainly calcium silicate hydrate and calcium aluminate hydrate. The two hydration products are cemented together with the tail mud particles to form a framework structure, thereby increasing the strength of the bricks made.

[0083] S4. Compression molding.

[0084] Convey the material aged in step S3 to the autoclave-free brick machine by belt, select the mold, and keep the molding pressure at 20 MPa for compression molding.

[0085] S5. Natural curing.

[0086] Send the brick blanks pressed in step S4 to the curing area, keep the temperature between 18 and 23 °C, keep the humidity above 90%, keep the air flowing properly, avoid direct sunlight, and cure for 10 days.

[0087] S6. Final product inspection.

[0088] Inspect the final product bricks (autoclave-free and steam-free bricks) cured in step S5, check their appearance integrity, test their water absorption rate of 15.0%, their strength reaching 16.5 MPa, their strength after freezing of 13.4 MPa, and their dry mass loss of 1.1%, meeting the MU15 standard.

[0089] Example 3

[0090] S1. Raw material ratio.

[0091] The raw materials are in a weight ratio, including 75% of the tail mud from the production of high-purity quartz of the albite type, 10% of quicklime, and 15% of cement.

[0092] S2. Mixing.

[0093] Send the raw materials prepared in step S1 to the mixer by the feeding machine, keep the moisture content at 13%, and stir strongly and evenly.

[0094] S3. Aging.

[0095] Leave the material after being evenly stirred in step S2 for 30 minutes to allow the effective calcium oxide, cement, and SiO2 and Al2O3 in the tail mud to undergo a hydration reaction to generate hydrates with a certain strength, mainly calcium silicate hydrate and calcium aluminate hydrate. The two hydration products are cemented together with the tail mud particles to form a framework structure, thereby increasing the strength of the bricks made.

[0096] S4. Compression molding.

[0097] Convey the material aged in step S3 to the autoclave-free brick machine by belt, select the mold, and keep the molding pressure at 25 MPa for compression molding.

[0098] S5, Natural curing.

[0099] Send the brick blanks pressed in step S4 to the curing area, keep the temperature between 18 and 23 °C, keep the humidity above 90%, keep the air circulating properly, avoid direct sunlight, and cure for 10 days.

[0100] S6, Final product inspection.

[0101] Inspect the cured final product bricks (non-fired and non-steamed bricks) in step S5, check their appearance integrity, test their water absorption rate of 11.6%, strength reaching 22.3 MPa, strength after freezing of 18.4 MPa, and dry mass loss of 0.7%, meeting the MU15 standard.

[0102] Conduct final product inspections on the non-fired and non-steamed bricks in Examples 1 to 3, and test their compressive strength, water absorption rate, frost resistance, etc. The results are shown in Table 1 below:

[0103] Table 1 Performance of non-fired and non-steamed bricks in Examples 1 to 3

[0104]

[0105]

[0106] In summary, the advantages of the present invention include at least one of the following:

[0107] (1) The preparation method of the non-fired and non-steamed bricks proposed by the present invention can utilize the tailings of white granite type high-purity quartz, saving land resources, making full use of mineral resources, and protecting the ecological environment.

[0108] (2) The preparation method of the non-fired and non-steamed bricks proposed by the present invention does not require ball milling, high-temperature sintering or high-pressure steam curing in the process, and has low production costs.

[0109] (3) The non-fired and non-steamed bricks proposed by the present invention have high strength, are lightweight and sound-insulating, waterproof, have good durability, standard dimensions, complete appearance, and uniform color.

[0110] Although the present invention has been described above by combining exemplary embodiments with respect to a non-fired and non-steamed brick and its preparation method, those skilled in the art should clearly understand that various modifications and changes can be made to the exemplary embodiments of the present invention without departing from the spirit and scope defined by the claims.

Claims

1. A non-fired and non-steamed brick, characterized in that, The non-fired and non-steamed brick comprises: by weight percentage, 70-80% of white granite type high-purity quartz production tail mud, 10-15% of quicklime and 10-15% of cement.

2. The non-fired and non-steamed brick according to claim 1, characterized in that, The particle size of the white granite type high-purity quartz production tail mud is below 0.075 mm.

3. The non-fired and non-steamed brick according to claim 1, characterized in that, The mineral composition of the white granite type high-purity quartz production tail mud mainly includes plagioclase, potassium feldspar, quartz and muscovite.

4. A preparation method of non-fired and non-steamed bricks, characterized in that, The preparation method comprises: By weight percentage, 70-80% of white granite type high-purity quartz production tail mud, 10-15% of quicklime and 10-15% of cement are mixed; the mixed material is aged; the aged material is pressed into a brick blank; the brick blank is naturally cured to obtain the non-fired and non-steamed brick.

5. The preparation method of the non-fired and non-steamed brick according to claim 4, wherein The mixing includes: maintaining the moisture content at 10-15% and stirring evenly.

6. The preparation method of the non-fired and non-steamed brick according to claim 4, characterized in that, The aging includes: placing for 30-40 min, undergoing a hydration reaction, and the generated hydration products are cemented with the white granite type high-purity quartz production tail mud particles to form a framework structure.

7. The preparation method of the non-fired and non-steamed bricks according to claim 6, characterized in that, The hydration products include calcium silicate hydrate and calcium aluminate hydrate.

8. The preparation method of the non-fired and non-steamed brick according to claim 4, characterized in that The pressing into shape includes: maintaining the forming pressure at 15-25 MPa and pressing into shape in a non-fired brick machine.

9. The preparation method of the non-fired and non-steamed brick according to claim 4, characterized in that, The natural curing includes: curing the pressed brick blank at normal temperature in a curing area for 7-15 days.

10. The preparation method of the non-fired and non-steamed brick according to claim 4, characterized in that, The preparation method further comprises: inspecting the cured sample, and the inspection includes dimensions, appearance, water absorption rate, frost resistance and strength, to obtain the non-fired and non-steamed brick that meets JC / T 422-2007 "Non-sintered Waste Tailings Brick".

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