A method for firing and molding end-stone powder

Abstract

The application discloses a firing forming method of end inkstone stone powder, and belongs to the technical field of waste resource utilization and ceramic product manufacturing. The method aims to solve the problem of direct discarding of a large amount of stone powder waste generated in the process of end inkstone carving, resource waste and environmental pollution. The technical scheme of the application is as follows: the end inkstone stone powder waste is collected, powdered, and sieved for raw material pretreatment; the obtained powder is mixed with water, and the mixture is left to stand and dehydrated to obtain plastic mud; then the mud is formed and dried, and then sintered under a specific temperature curve, and finally a ceramic product with a compact structure is obtained. Through the above-mentioned pure physical preparation and sintering process, the application realizes efficient recovery and high-value utilization of the end inkstone stone powder, the obtained product has excellent performance, has the characteristics of not leaking water, can be used as a living utensil or a decorative product, and meets the green manufacturing concept. The process flow chart of the application is shown in FIG. 2.

Description

Technical Field

[0001] This invention relates to the field of waste resource utilization and ceramic product manufacturing technology, specifically to a method for recycling and reusing stone powder waste generated during the carving and processing of Duan inkstones, and firing it into products with practical value. Background Technology

[0002] Duan inkstone, considered the foremost of China's four famous inkstones, is produced through a process that primarily includes quarrying, material preparation, design, carving, and polishing. During this process, especially the carving stage, a large amount of stone dust (such as...) is generated. Figure 1 (As shown). Currently, most of this stone powder is discarded or discharged directly as waste, which not only wastes resources but also puts pressure on the environment. Although there are existing technologies for using leftover Duan inkstone to make inkstones or other handicrafts, these methods still generate unusable Duan inkstone powder during the production process. Currently, there is a lack of a specialized method that can fully utilize the inherent properties of Duan inkstone powder and re-solidify it with good properties through purely physical preparation and sintering processes. Summary of the Invention

[0003] The technical problem to be solved by the present invention

[0004] This invention aims to address the shortcomings of existing technologies by providing a method for firing and molding Duan inkstone powder. This method efficiently recycles the stone powder waste generated during the production of Duan inkstones and, through a series of physical processing steps and specific sintering processes, molds it into dense, waterproof, and practical ceramic products without relying on external chemical binders. This achieves efficient and high-value utilization of Duan inkstone throughout its entire production process.

[0005] Technical solution of the present invention

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] (1) Raw material pretreatment: This stage includes three steps in sequence: collection, grinding and sieving.

[0008] ① Collection: Collect the dried stone powder sucked up by the exhaust fan during the hand carving process of Duan inkstone, and the waste mud containing a small amount of impurities in the sedimentation tank of the digital carving machine.

[0009] ②Powdering: The collected mud is dried and then fed into a powder grinder together with the collected dried stone powder to be crushed to obtain uniform stone powder.

[0010] ③ Sieving: Dissolve the obtained stone powder in water, stir to form a uniform slurry, and then sieve it through sieves of different mesh sizes in sequence. Collect the slurry that passes through the target mesh size sieve and let it stand to settle so that the particles separate naturally.

[0011] (2) Settling and filtering: After removing the clear liquid formed after settling in step (1), pure and fine inkstone clay can be obtained. The obtained inkstone clay is dehydrated until the water content of the clay reaches a plastic state.

[0012] (3) Shaping: Knead the clay obtained in step (2) to remove air bubbles and improve uniformity. Then, shape the kneaded clay into a blank by hand-throwing and hand-kneading, and air-dry it.

[0013] (4) Sintering: The air-dried green body is placed in a kiln and sintered according to a predetermined temperature curve. The temperature curve includes a heating stage, a holding stage, and a cooling stage. After sintering, the green body is naturally cooled to room temperature to obtain the finished product.

[0014] Beneficial effects of the present invention

[0015] (1) Resource utilization and environmental protection: This invention transforms the waste generated in the traditional and modern production of Duan inkstones into valuable resources, significantly improving the utilization rate of Duan inkstone materials and reducing solid waste emissions, which is in line with the concepts of green manufacturing and sustainable development.

[0016] (2) Maintaining the naturalness of the material: This invention mainly relies on physical methods and high-temperature sintering to re-bond the stone powder, avoiding the use of a large amount of organic binders, and the final product retains the sameness of natural stone in the production process.

[0017] (3) Excellent product performance: Through fine screening, extraction of fine particles from mud and optimized sintering process, the resulting product has a dense structure and is waterproof. It can be used as ceramic products in the range of household utensils, decorations and so on. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the process of Duan inkstone powder production, where ① represents the manual carving process; ② represents the machine carving process; and ③ represents the generated stone powder waste.

[0019] Figure 2 The flowchart of the method for firing and molding Duan inkstone powder according to the present invention is as follows: collecting raw materials is step ①, grinding is step ②, sieving is step ③, settling and filtering is step ④, molding is step ⑤, and sintering is step ⑥.

[0020] Figure 3 The effect of sintering temperature on product performance score is shown on the x-axis, where sintering temperature is represented by the x-axis and performance score is represented by the y-axis. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to embodiments:

[0022] Example 1

[0023] (1) Raw material pretreatment: Take 1 kg of dried stone powder collected by the dust collector and mix it with 2 kg of mud blocks collected in the sedimentation tank of the carving machine and naturally dried. Put the mixture into a pulverizer for crushing. Mix the resulting fine powder with water at a volume ratio of 1:2 and stir manually for 5 minutes to form a uniform slurry. Then, sieve the obtained slurry through 30 mesh, 80 mesh, 120 mesh, 150 mesh, 180 mesh and 240 mesh screens in sequence. Collect the slurry that passes through the target mesh screen and let it stand for 12 hours to allow the particles to separate naturally.

[0024] (2) Settling and filtering: Carefully scoop out the clear liquid formed after settling to obtain pure and fine inkstone mud. Put the obtained inkstone mud into a 500-mesh nylon filter bag and hang it for dehydration for no less than 48 hours, or place it on a gypsum board to air dry naturally for no less than 4 hours until the moisture content of the mud reaches a plastic state.

[0025] (3) Shaping: The obtained clay is repeatedly pounded and kneaded for 1 hour to remove the air contained in the clay and improve the uniformity of the clay pores. Then the kneaded clay is hand-thrown, hand-shaped, or placed in a mold for pressing to shape the clay into a blank, and then air-dried.

[0026] (4) Sintering: The air-dried green body is placed in the kiln and heated to 1145℃ in an oxidizing atmosphere in 8 temperature curves and held for 15 minutes.

[0027] ①The first temperature curve operates at a rate of 2.166℃ / min for 30 minutes, increasing the temperature from 25℃ to 90℃;

[0028] ②The second temperature curve operates at a rate of 1℃ / min for 60 minutes, increasing the temperature from 90℃ to 150℃;

[0029] ③ The third temperature curve operates at a rate of 3℃ / min for 50 minutes, increasing the temperature from 150℃ to 300℃;

[0030] ④ The fourth temperature curve is operated at a rate of 1℃ / min for 100 minutes, while the vent plug is inserted to raise the temperature from 300℃ to 400℃.

[0031] ⑤ The fifth temperature curve operates at a rate of 1.25℃ / min for 160 minutes, increasing the temperature from 400℃ to 600℃.

[0032] ⑥ The sixth temperature curve operates at a rate of 1.666℃ / min for 120 minutes, increasing the temperature from 600℃ to 800℃.

[0033] ⑦ The seventh temperature curve operates at a rate of 1.437℃ / min for 240 minutes, increasing the temperature from 800℃ to 1145℃.

[0034] ⑧ The eighth temperature curve is the heat preservation curve. After working for 15 minutes, the temperature of the upper and lower layers in the kiln will be controlled at 1145℃.

[0035] After the heat preservation is completed, wait for the temperature inside the kiln to drop to 400℃, then remove the vent plug. Wait for the temperature to drop to 100℃ before opening the kiln for rapid cooling. Once the temperature drops to room temperature, the finished product can be removed. Upon inspection, the finished product is dense, does not leak water, has not deformed, is brown in color, and produces a clear, crisp sound when tapped.

[0036] Example 2

[0037] To investigate the effects of different temperatures, this example differs from Example 1 only in the target temperature. Firing was performed at different temperatures, and the performance of the finished products was evaluated. The evaluation criteria are as follows:

[0038] (1) Permeability rating (out of 5):

[0039] ① The water droplet is absorbed instantly, which is worth 1 point.

[0040] ② The water droplets are absorbed relatively quickly, which is worth 2 points;

[0041] ③ The water droplets are absorbed slowly, which is worth 3 points;

[0042] ④ The water droplets spread out slightly but were not absorbed for a long time, which is scored as 4 points;

[0043] ⑤ Water droplets form a complete spherical shape on the surface and are not absorbed for a long time; this is scored as 5 points.

[0044] (2) Deformation degree rating (out of 5):

[0045] ① If the collapse occurs and the material adheres to the gasket and is difficult to separate, it is scored as 1 point;

[0046] ②Severe deformation, partially adhered to the gasket, scored as 2 points;

[0047] ③ It shows obvious deformation and is slightly adhered to the gasket, but the structure is intact, and is scored as 3 points;

[0048] ④ Slight deformation that does not affect use is scored as 4 points;

[0049] ⑤ The shape is regular and there is no deformation. It is scored as 5 points.

[0050] The color and sound of the finished product when tapped were also recorded, as shown in Table 1.

[0051] Table 1. Effect of different sintering temperatures on the properties of the finished product Sintering temperature Permeability score Deformation degree rating Color description Description of tapping sound 900℃ 1 5 Light orange with a white tint dull 1000℃ 2 5 Light orange dull 1060℃ 2 5 Deep orange Clearer 1100℃ 3 5 Light brown Clearer 1130℃ 4 4 Light brown with some light orange mixed in Clearer 1160℃ 5 3 brown crisp 1175℃ 5 3 brown crisp 1190℃ 5 2 Dark brown crisp 1220℃ 5 1 Dark brown crisp

[0052] The trends reflected in the above scoring results are as follows: Figure 3 As shown.

Claims

1. A method for the resource utilization of Duan inkstone powder waste, characterized in that, Includes the following steps: (1) Raw material pretreatment: The stone powder waste generated during the processing of Duan inkstone is pulverized and sieved to obtain powder of a specific particle size; (2) Clay preparation: The powder obtained in step (1) is mixed with water, left to stand, and then dehydrated to obtain a plastic clay. (3) Shaping and drying: The clay material is shaped into a blank and then dried; (4) Sintering: The dried blank is sintered to obtain a dense product.

2. The method according to claim 1, characterized in that, In step (1), the stone powder waste includes dried stone powder collected by the manual carving dust removal system and / or material formed by drying the sludge produced by the machine processing sedimentation tank.

3. The method according to claim 1 or 2, characterized in that, In step (1), the sieving process is to pass the powder through a sieve with a target mesh size, which is 30 to 240 mesh.

4. The method according to claim 1, characterized in that, In step (2), the water removal includes settling the powder slurry, removing the supernatant, and then filtering and dewatering the precipitate.

5. The method according to claim 1, characterized in that, In step (4), the maximum sintering temperature is 1100°C to 1220°C.

6. The method according to claim 5, characterized in that, The maximum sintering temperature is 1130°C to 1190°C.

7. The method according to claim 6, characterized in that, The maximum sintering temperature is 1160℃±10℃.

8. The method according to claim 1, characterized in that, In step (4), the sintering process includes at least one heat preservation stage.

9. The ceramic article prepared by the method according to any one of claims 1-8.

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