A non-burning and non-autoclaved brick and a preparation method thereof

Abstract

The application provides a kind of unfired and non-autoclaved brick and its preparation method, the unfired and non-autoclaved brick includes: 70-80% white granite type high-purity quartz production tailing mud, 10-15% quicklime and 10-15% cement by weight percentage.The preparation method of the unfired and non-autoclaved brick includes: 70-80% white granite type high-purity quartz production tailing mud, 10-15% quicklime and 10-15% cement are mixed by weight percentage;The material after mixing is aged;The material after aging is pressed into a brick blank;The brick blank is naturally cured to obtain the unfired and non-autoclaved brick.The application has the advantages that the application can change white granite type high-purity quartz raw material production tailing mud into treasure, solve the problem of tailing mud stacking and later treatment, do not need ball milling, can directly be dosed, the process is simple, and the cost is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building material manufacturing, and in particular to a non-burning and non-steaming brick and a preparation method thereof. BACKGROUND

[0002] High-purity quartz (SiO2 purity is 99.99% or more) as an important functional material has excellent physical and chemical properties such as high temperature resistance, corrosion resistance, high strength, high light transmittance, and low thermal expansion coefficient, and 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 is initially processed from first and second grade quartz, and as the quartz resources are gradually exhausted, high-purity quartz sand, especially 4N8 or more, is mainly obtained by sorting and purifying in white gangue. Quartz in white gangue accounts for only 20-30%.

[0003] With the rapid development of high-purity quartz sand industry, a large amount of white gangue type high-purity quartz raw materials need to be mined and utilized. A large amount of production tailings are generated in the production process of high-purity quartz sand, and the tailings are randomly stacked, which not only occupies land resources but also has production safety and environmental protection accident hazards, seriously affecting the safety of people's lives and property, and greatly wasting mineral resources and damaging the ecological environment.

[0004] Currently, there is no method for utilizing white gangue type high-purity quartz raw material production tailings. If the white gangue type high-purity quartz raw material production tailings can be used to make non-burning and non-steaming bricks, it will promote the development of high-purity quartz sand industry and have positive economic and social environmental benefits. Therefore, it is of great significance to provide a non-burning and non-steaming brick prepared by using white gangue type high-purity quartz production tailings and a preparation method thereof. SUMMARY

[0005] The present application aims to solve at least one of the above-mentioned deficiencies in the prior art. For example, one of the purposes of the present application is to provide a non-burning and non-steaming brick with high strength and effective utilization of white gangue type high-purity quartz production tailings. For another example, another purpose of the present application is to provide a preparation method of non-burning and non-steaming brick with simple process and low cost.

[0006] In order to achieve the above-mentioned purposes, the present application provides a non-burning and non-steaming brick, which can include: 70-80% white gangue type high-purity quartz production tailings, 10-15% quicklime, and 10-15% cement by weight percentage.

[0007] According to one or more exemplary embodiments of one aspect of the present application, the particle size of the white gangue type high-purity quartz production tailings can be below 0.075 mm.

[0008] According to one or more exemplary embodiments of one aspect of the present application, the mineral composition of the tailings of the production of the white granite type high-purity quartz mainly includes plagioclase, potassium feldspar, quartz and muscovite.

[0009] Another aspect of the present application provides a preparation method of the non-burning and non-autoclaved brick, which can include: mixing 70-80% of the tailings of the production of the white granite type high-purity quartz, 10-15% of the quicklime and 10-15% of the cement by weight percentage; aging the mixed material; pressing the aged material to obtain a green brick; and naturally curing the green brick to obtain the non-burning and non-autoclaved brick.

[0010] According to one or more exemplary embodiments of one aspect of the present application, the mixing can include: keeping the moisture content at 10-15% and uniformly stirring.

[0011] According to one or more exemplary embodiments of one aspect of the present application, the aging can include: placing for 30-40 min, generating hydration products, and cementing the hydration products with the tailings of the production of the white granite type high-purity quartz to form a skeleton structure.

[0012] According to one or more exemplary embodiments of one aspect of the present application, the hydration products can include hydrated calcium silicate and hydrated calcium aluminate.

[0013] According to one or more exemplary embodiments of one aspect of the present application, the pressing can include: keeping the forming pressure at 15-25 MPa and pressing the green brick in a non-burning brick machine.

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

[0015] According to one or more exemplary embodiments of one aspect of the present application, the preparation method can further include: testing the cured sample, the testing including size, appearance, water absorption, frost resistance and strength, to obtain the non-burning and non-autoclaved brick meeting the JC / T 422-2007 Non-sintered garbage tailings brick.

[0016] Compared with the prior art, the present application has the following beneficial effects at least one of which is included:

[0017] (1) The non-burning and non-autoclaved brick has a simple and natural appearance, can be used as a drywall or any external decoration, has environmental protection significance, and meets the circular economy development mode.

[0018] (2) The preparation method of the non-burning and non-autoclaved brick can change the tailings of the production of the white granite type high-purity quartz into treasure, solve the problems of the tailings storage and later treatment, and directly prepare the material without ball milling, so that the preparation process is simple and the cost is low. Attached Figure Description

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

[0020] Figure 1 A schematic flowchart illustrating a method for preparing non-fired and non-steamed bricks according to an exemplary embodiment of the present invention is shown.

[0021] Figure 2A A schematic diagram of the structure of a non-fired and non-steamed brick according to an exemplary embodiment of the present invention is shown;

[0022] Figure 2B Another structural schematic diagram of a non-fired and non-steamed brick according to an exemplary embodiment of the present invention is shown;

[0023] Figure 3A The laser particle size analyzer test results of the tailings from the production of high-purity quartz raw material of granite type according to the present invention are shown in the figure.

[0024] Figure 3B The composition spectrum of the tailings from the production of high-purity quartz raw materials of granite type is presented in this invention. Detailed Implementation

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

[0026] Exemplary Example 1

[0027] This exemplary embodiment provides a method for preparing non-fired and non-steamed bricks.

[0028] Figure 1 A schematic flowchart illustrating a method for preparing non-fired and non-steamed bricks according to an exemplary embodiment of the present invention is shown below. Figure 1 This describes a method for preparing non-fired and non-steamed bricks according to an exemplary embodiment.

[0029] like Figure 1 As shown, the preparation method of non-fired and non-steamed bricks mainly includes: mixing 70-80% tailings (tailings from the production of high-purity quartz of granite type), 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 molding pressure of 15-25 MPa), and naturally curing for 7-15 days. Finally, the finished product can be inspected, and the dimensions, outer skin and strength can be tested to select non-fired and non-steamed bricks that meet the expectations.

[0030] Specifically, the preparation method of the non-fired and non-steamed bricks of this exemplary embodiment may include the following steps:

[0031] S1, determining the raw material ratio.

[0032] The raw material according to the present application is proportioned by weight and comprises 70-80% of tail mud from production of white-porphyry type high-purity quartz, 10-15% of quicklime and 10-15% of cement.

[0033] S2, mixing the materials.

[0034] The raw material prepared in step S1 is sent to the mixer by the feeding machine, and the moisture is kept at 10-15%, and the materials are uniformly stirred.

[0035] S3, aging.

[0036] The materials uniformly stirred in step S2 are placed for 30-40 minutes, so that the effective calcium oxide in the quicklime and the cement and SiO2 and Al2O3 in the tail mud undergo hydration to generate hydrates with certain strength, and the hydrates and the tail mud particles are cemented together to form a skeleton structure, thereby increasing the strength of the bricks.

[0037] S4, pressing and forming.

[0038] The materials aged in step S3 are sent to the baking-free brick machine by the belt, and the mold is selected, and the forming pressure is kept at 15-25 MPa, and the materials are pressed and formed.

[0039] S5, natural curing.

[0040] The bricks obtained in step S4 are sent to the curing area for natural curing (normal temperature curing) for 7-15 days, and the baking-free and baking-free steaming bricks are obtained.

[0041] In the present exemplary embodiment, in step S1, the particle size of the tail mud from production of white-porphyry type high-purity quartz raw material is below 0.075 mm. The main mineral composition of the tail mud comprises quartz, feldspar and mica. Further, 40-62% of it is plagioclase, 5-12% of it is potassium feldspar, 15-30% of it is quartz and 5-12% of it is white mica; the main chemical composition is 65-80% of SiO2, 10-15% of Al2O3, 1-10% of K2O, 1-10% of Na2O, 0.01-2% of Fe2O3, 0.01-2% of CaO and 0.01-1% of P2O5, for example, it can be 79.87% of SiO2, 10.91% of Al2O3, 3.01% of K2O, 6.31% of Na2O, 0.81% of Fe2O3, 0.38% of CaO and 0.146% of P2O5.

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

[0043] 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 the present exemplary embodiment, in step S3, the hydrate formed by hydration can include calcium silicate hydrate and calcium aluminate hydrate.

[0048] Further, the main components in the tailings are SiO2 and Al2O3 hydrate, mainly calcium silicate hydrate and calcium aluminate hydrate, and some other components in the raw material can also form hydrates, with low content, for example, the gypsum component contained in cement can generate calcium sulphoaluminate hydrate in the hydration process, and generally 3-5% of gypsum in cement.

[0049] The skeleton structure formed in step S3 is mainly different in the voidage of the skeleton compared with the conventional hydration cementation forming substance, the tailings produced from the white marble type high-purity quartz raw material are finer, with a particle size of 0.075 mm or less, capable of filling the voids between the cement particles, reducing the porosity of the skeleton structure, and making the structure more compact.

[0050] In the present exemplary embodiment, in step S5, the conditions for natural curing can include a temperature of 15-25°C, a humidity of preferably more than 90%, maintaining proper air circulation, and avoiding direct sunlight.

[0051] In the present exemplary embodiment, the preparation method of the non-burning and non-steaming brick can further include step S6, which includes product inspection. Specifically, the finished product brick cured in step S5 can be inspected to check whether its size, appearance and strength meet the expected standards, and can be packaged for storage and sale. After curing, about 70-95% of the obtained bricks meet the expectations.

[0052] In the present exemplary embodiment, the non-burning and non-steaming brick is a brick hardened by normal temperature natural curing and the like without high-temperature calcination and steam curing. The present application uses tailings produced from white marble type high-purity quartz raw material as the main raw material, which can meet the requirements of JC / T 422-2007 "Non-sintered garbage tailings brick".

[0053] Exemplary Embodiment 2

[0054] The present exemplary embodiment provides a non-burning and non-steaming brick.

[0055] Figure 2A A structural schematic diagram of the unfired and unsteamed brick of one example embodiment of the present application is shown. Figure 2B Another structural schematic diagram of the unfired and unsteamed brick of one example embodiment of the present application is shown.

[0056] Figure 3A A laser particle size analyzer test result diagram of the tailings of the white granite type high-purity quartz raw material production of the present application is shown. Figure 3B A composition detection diagram of the tailings of the white granite type high-purity quartz raw material production of the present application is shown. The unfired and unsteamed brick of the present example embodiment will be described below in conjunction with the specific examples. Figures 2A to 3B

[0057] The unfired and unsteamed brick of the present example embodiment can include the product prepared by the preparation method of the unfired and unsteamed brick described in the above example embodiment 1.

[0058] In the present example embodiment, the particle size of the tailings of the white granite type high-purity quartz production is below 0.075 mm, and the laser particle size analyzer test result of the tailings is shown in Figure 3A

[0059] In the present example embodiment, the main mineral composition of the tailings of the white granite type high-purity quartz production includes quartz, feldspar and mica. As shown in Figure 3B , the mineral composition of the tailings mainly includes plagioclase, potassium feldspar, quartz and mica, and specifically, the mineral composition includes 56% plagioclase, 11% potassium feldspar, 20% quartz and 13% muscovite.

[0060] Further, the main chemical components of the tailings 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 the present example embodiment, the appearance, size and strength of the unfired and unsteamed brick can refer to the requirements of JC / T422-2007 “Non-sintered garbage tailings brick”. As shown in Figure 2A and Figure 2B , the size standard of the unfired and unsteamed brick is complete in shape and uniform in color.

[0062] In order to better understand the above example embodiments of the present application, they will be further described below in conjunction with specific examples.

[0063] Example 1

[0064] S1, raw material ratio.

[0065] The raw materials are proportioned by weight, which include 75% tailings of the white granite type high-purity quartz production, 12% quicklime and 13% cement.​​

[0066] S2, mixing.

[0067] The raw materials prepared in step S1 are sent to the mixer by the feeding machine, and are uniformly stirred with 13% moisture.

[0068] S3, aging.

[0069] The material uniformly stirred in step S2 is placed for 30 minutes to allow the effective calcium oxide, cement and SiO2, Al2O3 in the tailings to undergo hydration to generate hydrates with certain strength, mainly calcium silicate hydrate and calcium aluminate hydrate, and the two kinds of hydration products and tailings particles are cemented together to form a skeleton structure, thereby increasing the strength of the finished bricks.

[0070] S4, pressing.

[0071] The material aged in step S3 is sent by the belt to the non-fired brick machine, and the mold is selected, and the forming pressure is kept at 20 MPa for pressing.

[0072] S5, natural curing.

[0073] The pressed brick blank in step S4 is sent to the curing area, the temperature is kept at 18-23°C, the humidity is kept above 90%, the air is kept properly circulated, direct sunlight is avoided, and the curing is kept for 10 days.

[0074] S6, finished product inspection.

[0075] The finished product brick (non-fired and non-steamed brick) cured in step S5 is inspected, the appearance is checked, the water absorption is tested to be 14.3%, the strength is 19.4 MPa, the strength after freezing is 14.7 MPa, the dry mass loss is 0.8%, and it meets the MU15 standard.

[0076] Example 2

[0077] S1, raw material ratio.

[0078] The raw materials are proportioned by weight, which includes 80% tailings of white gangue type high-purity quartz production, 10% quicklime and 10% cement.

[0079] S2, mixing.

[0080] The raw materials prepared in step S1 are sent to the mixer by the feeding machine, and are uniformly stirred with 15% moisture.

[0081] S3, aging.

[0082] The material after being stirred in step S2 is left for 30 minutes to allow the effective calcium oxide, cement and SiO2, Al2O3 in the tailings to undergo hydration to generate hydrates with certain strength, mainly calcium silicate hydrate and calcium aluminate hydrate, and the two kinds of hydration products and tailings particles are cemented together to form a skeleton structure, thereby increasing the strength of the finished bricks.

[0083] S4, pressing forming.

[0084] The material after aging in step S3 is conveyed by a belt to a non-fired brick machine, a mold is selected, and the forming pressure is kept at 20 MPa for pressing forming.

[0085] S5, natural curing.

[0086] The pressed brick blank in step S4 is sent to a curing area, the temperature is kept at 18-23°C, the humidity is kept above 90%, the air is kept properly ventilated, direct sunlight is avoided, and the curing is kept for 10 days.

[0087] S6, finished product inspection.

[0088] The finished product brick (non-fired and non-steamed brick) after curing in step S5 is inspected, the appearance is checked, the water absorption rate is tested to be 15.0%, the strength is tested to be 16.5 MPa, the strength after freezing is tested to be 13.4 MPa, the dry mass loss is tested to be 1.1%, and the MU15 standard is met.

[0089] Example 3

[0090] S1, raw material proportioning.

[0091] The raw materials are proportioned by weight, including tailings of white gangue type high-purity quartz production 75%, quicklime 10%, and cement 15%.

[0092] S2, mixing.

[0093] The raw materials prepared in step S1 are sent to a mixer by a feeding machine, the moisture is kept at 13%, and the stirring is uniformly strong.

[0094] S3, aging.

[0095] The material after being stirred in step S2 is left for 30 minutes to allow the effective calcium oxide, cement and SiO2, Al2O3 in the tailings to undergo hydration to generate hydrates with certain strength, mainly calcium silicate hydrate and calcium aluminate hydrate, and the two kinds of hydration products and tailings particles are cemented together to form a skeleton structure, thereby increasing the strength of the finished bricks.

[0096] S4, pressing forming.

[0097] The material after aging in step S3 is conveyed by a belt to a non-fired brick machine, a mold is selected, and the forming pressure is kept at 25 MPa for pressing forming.

[0098] S5, natural curing.

[0099] The pressed bricks in step S4 are sent to a curing area, the temperature is kept at 18-23 DEG C, the humidity is kept above 90%, the air is kept circulating properly, direct sunlight is avoided, and curing is kept for 10 days.

[0100] S6, finished product inspection.

[0101] The finished product bricks (non-burning and non-steaming bricks) cured in step S5 are inspected, the appearance integrity is checked, the water absorption is tested to be 11.6%, the strength is tested to be 22.3 MPa, the post-freezing strength is tested to be 18.4 MPa, the dry mass loss is tested to be 0.7%, and the MU15 standard is met.

[0102] The finished product inspection is performed on the non-burning and non-steaming bricks in examples 1-3, the compressive strength, water absorption, and frost resistance are tested, and the results are shown in Table 1.

[0103] Table 1: Performance of non-burning and non-steaming bricks in examples 1-3

[0104]

[0105]

[0106] In summary, the advantages of the non-burning and non-steaming bricks and the preparation method thereof include at least one of the following:

[0107] (1) The preparation method of the non-burning and non-steaming bricks can utilize the tailings of white-porphyry type high-purity quartz, saves land resources, fully utilizes mineral resources, and protects the ecological environment.

[0108] (2) The preparation method of the non-burning and non-steaming bricks does not use ball milling, does not need high-temperature sintering or high-pressure steam curing, and has low manufacturing cost.

[0109] (3) The non-burning and non-steaming bricks have high strength, light weight, sound insulation, waterproofness, good durability, standard size, complete appearance, and uniform color.

[0110] Although the non-burning and non-steaming bricks and the preparation method thereof have been described above by combining with the exemplary embodiments, it should be clear for those skilled in the art that various modifications and changes can be made to the exemplary embodiments of the present application without departing from the spirit and scope defined by the claims.

Claims

1. A non-burnt and non-autoclaved brick, characterized by, The baking-free and steaming-free brick comprises 70-80% of white granite type high-purity quartz production tail mud, 10-15% of quicklime and 10-15% of cement by weight percentage.

2. The non-burnt and non-firing 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-burnt and non-autoclaved brick according to claim 1, characterized in that, The mineral composition of the white granite type high-purity quartz production tail mud mainly comprises plagioclase, potassium feldspar, quartz and muscovite.

4. A method of manufacturing a non-burned and non-autoclaved brick, characterized by, The preparation method comprises: The 70-80% of white granite type high-purity quartz production tail mud, 10-15% of quicklime and 10-15% of cement are mixed by weight percentage; the mixed material is aged; the aged material is pressed into a brick blank; the brick blank is naturally cured, and the natural curing comprises: the pressed brick blank is cured at a normal temperature of 15-25 DEG C in a curing area for 7-15 days; the baking-free and steaming-free brick is obtained; the compressive strength of the baking-free and steaming-free brick is greater than 15 MPa.

5. A process for the manufacture of the non-burnt, non-autoclaved brick according to claim 4, characterized in that, The mixing comprises: keeping the moisture content of 10-15% and uniformly stirring.

6. A process for the manufacture of the non-burnt, non-autoclaved brick according to claim 4, characterized in that, The aging comprises: placing for 30-40 min, generating hydration product, and the hydration product and white granite type high-purity quartz production tail mud particles are cemented to form a skeleton structure.

7. A process for the manufacture of the non-burnt and non-firing brick according to claim 6, characterized by, The hydration product comprises hydrated calcium silicate and hydrated calcium aluminate.

8. A process of making a non-burnt, non-firing brick as claimed in claim 4 wherein, The pressing comprises: keeping the forming pressure of 15-25 MPa, and pressing in a baking-free brick machine.

9. A process of making a non-burnt, non-firing brick as claimed in claim 4 wherein, The preparation method further comprises: testing the cured sample, and the testing comprises size, appearance, water absorption, frost resistance and strength, so that the baking-free and steaming-free brick meets the requirements of JC / T422-2007 Non-sintered garbage tailing brick.

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