Solid-liquid separation type crucible for preparing silicon nitride material
By setting up the inner and outer crucibles and filters in the crucible, the automatic separation of silicon nitride and molten salt is achieved by using universal connections and alligator clip limit columns, the problem of silicon nitride loss in traditional crucibles is solved, and the yield and purity are improved reduces production costs.
Patent Information
- Application Number
- CN202420445262.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-08
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-03-08
AI Technical Summary
In a traditional single-layer crucible, during the separation of silicon nitride and molten salt, the molten salt melts first due to the increase in temperature, and then the silicon nitride melts. When hydrochloric acid and hydrofluoric acid are added for washing, the silicon nitride reaction will be reduced. The content causes product loss and increases industrial production costs.
A solid-liquid separation crucible is designed, which adopts a universal connection between the inner crucible and the outer crucible. It is heated and melted by the inner crucible and deflects to the filter screen, so that the molten salt liquid enters the outer crucible through the graphite filter screen. Realize solid-liquid separation, avoid the use of hydrochloric acid and hydrofluoric acid, use the crocodile clip limit column and automatic deflection mechanism to achieve automated control without manual intervention.
The pure separation of silicon nitride and molten salt is achieved, which avoids the loss of silicon nitride, improves yield and product purity, reduces production costs, and improves operational convenience through automated control.
Smart Images
Figure CN222358460U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chemical raw materials and chemical product manufacturing industries, and specifically relates to a solid-liquid separation type crucible for preparing silicon nitride materials. Background Art
[0002] At present, silicon nitride ceramics is a new type of advanced ceramic material with broad development prospects. It has many excellent properties such as low density, high strength, high temperature resistance, corrosion resistance, long life, self-lubrication, high hardness and toughness, non-magnetic insulation, etc. It is currently the structural ceramic material with the best comprehensive performance. In order to obtain purer silicon nitride, silicon nitride and molten salt need to be separated in a crucible. In a traditional single-layer crucible, due to the increase in temperature, the mixture of the two melts from solid to liquid first, and then the silicon nitride melts. At this time, hydrochloric acid and hydrofluoric acid are added to the crucible to wash the molten salt, but at the same time it will also react with silicon nitride to reduce the silicon nitride content and cause a certain loss of the product. This will greatly increase the cost in the industrial production process and is a problem that needs to be solved urgently. Summary of the invention
[0003] In view of this, the purpose of the utility model is to provide a solid-liquid separation type crucible for preparing silicon nitride material. The solid-liquid separation type crucible for preparing silicon nitride material is provided with an inner crucible, an outer crucible and a filter screen. The inner crucible and the outer crucible are universally connected. The inner crucible can be used to heat and melt the mixture. When it is heated to the melting point of the molten salt, the inner crucible is deflected toward the filter screen so that the molten salt liquid in the inner crucible passes through the filter screen into the outer crucible, thereby achieving the purpose of solid-liquid separation. There is no need to use hydrochloric acid and hydrofluoric acid, thereby avoiding the loss of silicon nitride.
[0004] In order to achieve the above-mentioned purpose, the utility model discloses a solid-liquid separation crucible for preparing silicon nitride material, comprising an outer crucible and an inner crucible sleeved in the outer crucible, the inner bottom of the outer crucible is provided with an outer spherical groove, the bottom of the inner crucible is provided with an inner spherical convex groove, a supporting sphere is provided between the outer spherical groove and the inner spherical convex groove, a liquid outlet is provided on one side of the inner crucible, a filter screen connected to the outer crucible is provided at the liquid outlet, and a limiting column for preventing the inner crucible from tilting is provided between the outer crucible and the inner crucible.
[0005] Furthermore, the limiting columns are provided in a pair and are symmetrically arranged at the middle of the inner wall of the outer crucible, wherein one limiting column is arranged on the inner wall close to the liquid outlet.
[0006] Furthermore, the limiting column is configured as an alligator clip and a connecting strip clamped in the alligator clip and having the same melting point as the molten salt, the alligator clip is mounted on the inner wall of the outer crucible, and the connecting strip is mounted on the outer wall of the inner crucible.
[0007] Furthermore, a liquid outlet groove is arranged on the side wall of the inner crucible near the liquid outlet, the liquid outlet is arranged at the end of the liquid outlet groove, and the liquid outlet groove forms an angle of 30-45° with the horizontal line.
[0008] Furthermore, the liquid outlet is located in the middle of the side wall of the inner crucible, and a counterweight column is provided on the side wall of the inner crucible above the liquid outlet.
[0009] Furthermore, the counterweight column is configured as a semi-cylindrical structure.
[0010] Furthermore, the filter is configured as a graphite filter.
[0011] Furthermore, the bottom of the outer crucible is evenly distributed with supporting feet.
[0012] The beneficial effects of the utility model are:
[0013] 1. The utility model discloses a solid-liquid separation crucible for preparing silicon nitride material, which is provided with an inner crucible, an outer crucible and a filter screen. The inner crucible and the outer crucible are universally connected. The inner crucible can be used to heat and melt the mixture. When the mixture is heated to the melting point of the molten salt, the inner crucible is deflected toward the filter screen so that the molten salt liquid in the inner crucible passes through the filter screen into the outer crucible, thereby achieving the purpose of solid-liquid separation. There is no need to use hydrochloric acid and hydrofluoric acid, thus avoiding the loss of silicon nitride.
[0014] 2. The solid-liquid separation crucible for preparing silicon nitride material of the utility model has the following advantages:
[0015] 1) The design of the double-layer crucible makes it possible to separate silicon nitride from molten salt without the involvement of hydrochloric acid or hydrofluoric acid, thereby increasing the yield of silicon nitride products;
[0016] 2) The design of the graphite mesh completely separates solid silicon nitride from liquid molten salt, making the product purer;
[0017] 3) The limit column adopts crocodile clip, which has strong grip, high melting point, convenient operation and can be reused;
[0018] 4) When the melting point of the molten salt is reached, the molten salt with the same melting point as the molten salt can change the shape of the crucible without human intervention, saving time and worry;
[0019] 5) The sphere between the double-layer crucibles enables the crucible to deflect without manual intervention, thus achieving the purpose of automatic control. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 A schematic diagram of the moving state of the solid-liquid separation crucible used for preparing silicon nitride material according to the utility model;
[0021] Figure 2A top view of a solid-liquid separation crucible for preparing silicon nitride material according to the utility model;
[0022] Figure 3 It is a side view of the solid-liquid separation type crucible used for preparing silicon nitride material according to the utility model;
[0023] Figure 4 The utility model is a bottom view of a solid-liquid separation type crucible for preparing silicon nitride material.
[0024] Figure numerals: 1. inner crucible; 2. outer crucible; 3. filter screen; 4. counterweight column; 5. inner spherical groove; 6. limiting column; 7. supporting foot; 8. outer spherical groove; 9. supporting sphere. DETAILED DESCRIPTION
[0025] The preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.
[0026] like Figure 1-4 The figure shows a schematic structural diagram of a solid-liquid separation crucible for preparing silicon nitride materials according to the utility model; the utility model provides a solid-liquid separation crucible for preparing silicon nitride materials, comprising an outer crucible 2 and an inner crucible 1 sleeved in the outer crucible 2, the outer crucible 2 having an outer spherical groove 8 at the bottom, the inner crucible 1 having an inner spherical convex groove 5 at the bottom, a supporting sphere 9 between the outer spherical groove 8 and the inner spherical convex groove 5, a liquid outlet at one side of the inner crucible 2, a filter screen 3 connected to the outer crucible 2 at the liquid outlet, and a limiting column 6 for preventing the inner crucible from tilting is provided between the outer crucible 2 and the inner crucible 1.
[0027] In this embodiment, silicon nitride and molten salt are placed in an inner crucible, and then flame is used to heat the silicon nitride and the molten salt. At this time, the top of the inner crucible 1 is flush with the outer crucible 2 under the operation of the limiting column 6, and the liquid outlet is located in the upper middle of the side wall. After the molten salt melts from solid to liquid, the inner crucible is tilted to one side of the liquid outlet, so that the molten salt liquid flows from the liquid outlet to the outer crucible 1, thereby achieving the purpose of solid-liquid separation, and there is no need to use hydrochloric acid and hydrofluoric acid, thereby avoiding the loss of silicon nitride.
[0028] In a preferred embodiment, the limiting columns 6 are arranged as a pair and are symmetrically arranged in the middle of the inner wall of the outer crucible 2, wherein one limiting column 6 is arranged on the inner wall near the liquid outlet, the limiting column 6 is arranged as a crocodile clip and a connecting strip clamped in the crocodile clip and having the same melting point as the molten salt, the crocodile clip is installed on the inner wall of the outer crucible, and the connecting strip is installed on the outer wall of the inner crucible. In this embodiment, the melting point of the connecting strip between the two crocodile clips 6 must be consistent with the substance with a lower melting point in the mixture. When the temperature of the low-melting-point substance is reached, when the molten salt melts from solid to liquid, the connecting strip melts into liquid at the same time. At this time, the inner crucible 1 will not be restricted by the limiting column 6, which is convenient for displacement, thereby achieving the purpose of automatic displacement of liquid during heating.
[0029] In a preferred embodiment, a liquid outlet groove is provided on the side wall of the inner crucible 1 close to the liquid outlet, and the liquid outlet is provided at the end of the liquid outlet groove. The liquid outlet groove forms an angle of 30-45° with the horizontal line. This structure facilitates the molten salt to flow out from the liquid outlet on the liquid outlet groove when the solid melts into the liquid, thereby achieving the purpose of solid-liquid separation.
[0030] In a preferred embodiment, the liquid outlet is located in the middle of the side wall of the inner crucible, and a counterweight column 4 is provided on the side wall of the inner crucible 1 above the liquid outlet. The counterweight column 4 is configured as a semi-cylindrical structure, and the connecting bars of the structure melt into liquid at the same time. At this time, the inner crucible 1 will not be restricted by the limiting column 6, and the counterweight column drives the inner crucible to deviate to one side of the liquid outlet to discharge liquid, thereby achieving the purpose of automatically deviating the liquid during the heating process.
[0031] In a preferred embodiment, the filter screen 3 is configured as a graphite filter screen. The design of the graphite screen allows the solid silicon nitride to be completely separated from the liquid molten salt, resulting in a purer product.
[0032] In a preferred embodiment, support legs 7 are evenly distributed on the bottom of the outer crucible 2, and the height of the four support legs 7 on the bottom of the crucible is not less than the height of the semicircle protruding from the bottom of the outer crucible to ensure the stability of the crucible.
[0033] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.
Claims
1. A solid-liquid separation crucible for preparing silicon nitride material, characterized in that: The invention comprises an outer crucible and an inner crucible which is sleeved in the outer crucible, wherein the inner bottom of the outer crucible is provided with an outer spherical groove, the bottom of the inner crucible is provided with an inner spherical convex groove, a supporting sphere is provided between the outer spherical groove and the inner spherical convex groove, a liquid outlet is provided on one side of the inner crucible, a filter screen which is connected with the outer crucible is provided at the liquid outlet, and a limiting column for preventing the inner crucible from tilting is provided between the outer crucible and the inner crucible.
2. A solid-liquid separation crucible for preparing silicon nitride material according to claim 1, characterized in that: The limiting columns are arranged in a pair and are symmetrically arranged at the middle of the inner wall of the outer crucible, wherein one limiting column is arranged on the inner wall close to the liquid outlet.
3. A solid-liquid separation crucible for preparing silicon nitride material according to claim 2, characterized in that: The limiting column is configured as an alligator clip and a connecting strip clamped in the alligator clip and having the same melting point as the molten salt. The alligator clip is mounted on the inner wall of the outer crucible, and the connecting strip is mounted on the outer wall of the inner crucible.
4. A solid-liquid separation crucible for preparing silicon nitride material according to any one of claims 1 to 3, characterized in that: A liquid outlet groove is arranged on the side wall of the inner crucible near the liquid outlet, the liquid outlet is arranged at the end of the liquid outlet groove, and the liquid outlet groove forms an angle of 30-45° with the horizontal line.
5. A solid-liquid separation crucible for preparing silicon nitride material according to claim 4, characterized in that: The liquid outlet is located at the middle of the side wall of the inner crucible, and a counterweight column is arranged on the side wall of the inner crucible above the liquid outlet.
6. A solid-liquid separation crucible for preparing silicon nitride material according to claim 5, characterized in that: The counterweight column is configured as a semi-cylindrical structure.
7. A solid-liquid separation crucible for preparing silicon nitride material according to claim 1, characterized in that: The filter screen is configured as a graphite filter screen.
8. A solid-liquid separation crucible for preparing silicon nitride material according to claim 1, characterized in that: The bottom of the outer crucible is evenly distributed with supporting feet.