Potassium nitrate purification production device
By designing a potassium nitrate purification production device, using temperature differences to separate potassium nitrate, the problems of waste and high cost of potassium nitrate resources in the prior art are solved, and efficient purification and reuse are achieved.
Patent Information
- Application Number
- CN202421944905.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-12
AI Technical Summary
In the prior art, high concentrations of potassium nitrate are constantly exchanged and contaminated during the chemically strengthened glass process, resulting in waste of resources and high costs.
A potassium nitrate purification production device was designed. Through the combination of a dissolution tank and a cooling tank, the solubility difference at different temperatures is used to separate potassium nitrate from the waste alkali salts, and a high-purity potassium nitrate solid was obtained through filtration and drying.
It realizes efficient purification and reuse of potassium nitrate, reduces the cost of chemically strengthened glass, and solves the problem of resource waste.
Smart Images
Figure CN222983753U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of potassium nitrate purification, and in particular to a potassium nitrate purification production device. Background Art
[0002] As modern communication technology is replaced more and more frequently, chemically strengthened glass is widely used in products such as smart phones, smart wearables and tablets due to its special physical properties; chemically tempered glass is placed in molten alkali salts to exchange ions in the surface layer of the glass with ions in the molten salts. Due to the volume change after the exchange, compressive stress is formed on both surfaces of the glass and tensile stress is formed inside, thereby achieving the effect of improving the strength of the glass. Chemically tempered glass has high strength, good thermal stability, no surface deformation, can be properly cut and processed, and has no self-explosion phenomenon.
[0003] The alkali salts used for chemical strengthening of high alumina silicate glass and soda-lime silicate glass are basically high-concentration potassium nitrate alkali salts. The molten alkali salts and free potassium ions will exchange with the sodium ions inside the glass material at high temperature; the alkali salts used for chemical strengthening of lithium alumina silicate glass are basically double chemical strengthening. The first step requires a relatively high concentration of sodium nitrate and potassium nitrate alkali salt mixture. The free sodium ions of the molten alkali salt will exchange with the lithium ions inside the glass material at high temperature. The second step requires a high concentration of potassium nitrate and sodium nitrate alkali salt mixture. The free potassium ions of the molten alkali salt will exchange with the sodium ions on the surface of the glass material, thereby making the glass surface have higher physical properties.
[0004] Both of the above two chemical strengthening methods require the use of high-concentration potassium nitrate solution, and both will cause the high-concentration potassium nitrate to be continuously exchanged, the sodium ions become higher and higher, and during the operation, there is continuous pollution, and finally the alkaline salt potassium nitrate cannot be used and is discarded; and in the cost of chemically strengthened glass processing products, the cost of potassium nitrate has always been high.
[0005] The existing discarded potassium nitrate is generally used for agricultural fertilizer treatment and is no longer used for chemical strengthening operations, resulting in a waste of resources. For this reason, the present application provides a potassium nitrate purification production device. Utility Model Content
[0006] In order to overcome the shortcomings of the prior art, the present application provides a potassium nitrate purification production device, which utilizes the different solubilities of various components of discarded alkali salts in water to dissolve the discarded alkali salts in a dissolution tank, and then cools the potassium nitrate with low solubility through a cooling tank to precipitate it, while sodium nitrate and lithium nitrate with high solubility still dissolve in the cooling tank under low temperature conditions because their solubility changes caused by temperature reduction are not obvious, and the precipitated potassium nitrate is subjected to a first filter and an oven treatment to obtain high-purity potassium nitrate solid.
[0007] The technical solution adopted by this application to solve its technical problems is as follows:
[0008] A potassium nitrate purification production device includes a dissolution tank, the dissolution tank is connected to a cooling tank, and the cooling tank is connected to a first filter;
[0009] A heating mechanism for heating the dissolution tank is provided outside the dissolution tank;
[0010] A cooling mechanism for cooling the cooling tank is provided outside the cooling tank.
[0011] In some embodiments, the dissolution tank is connected to a pulverizer, and the pulverizer is used to pulverize the raw material to be dissolved.
[0012] In some embodiments, the cooling mechanism includes an annular cooling tank.
[0013] In some embodiments, the discharge pipe of the first filter is connected to an oven.
[0014] In some embodiments, the liquid discharge pipe of the first filter is connected to the feed inlet of the dissolution tank.
[0015] In some embodiments, the feed inlet of the dissolution tank is connected to the discharge outlet of a dissolution-promoting tank.
[0016] In some embodiments, a second filter is further included. The dissolution tank is connected to the second filter, the second filter is connected to the cooling tank, and the cooling tank is connected to the first filter.
[0017] In some embodiments, the temperature during dissolution in the dissolution tank is 95 - 100 °C.
[0018] In some embodiments, the temperature during cooling in the cooling tank is 5 - 10 °C.
[0019] The beneficial effects of this application are as follows:
[0020] 1. For the potassium nitrate purification production device described in this application, by utilizing the different solubilities of various components of waste alkali salts in water, the waste alkali salts are dissolved in the dissolution tank, and then cooled in the cooling tank. Potassium nitrate with low solubility is cooled and precipitated, while sodium nitrate and lithium nitrate with high solubility still dissolve in the cooling tank under low-temperature conditions due to the insignificant change in solubility caused by the temperature drop. The precipitated potassium nitrate is processed through the first filter and the oven to obtain high-purity potassium nitrate solid.
[0021] 2. The potassium nitrate purification production device described in this application utilizes the dissolution method to completely dissolve potassium nitrate, sodium nitrate, and lithium nitrate at low temperatures, and separates potassium nitrate from other substances at low temperatures, thereby achieving the purification of potassium nitrate and the purpose of reuse, greatly increasing the utilization rate of potassium nitrate in chemical strengthening.
[0022] 3. The potassium nitrate purification production device described in this application can obtain high-purity potassium nitrate solid, solve the problem of high solution cost in chemical strengthening of aluminosilicate glass, soda-lime glass, and lithium aluminosilicate glass chemical toughening products; through the potassium nitrate purification production device, low-cost purification of potassium nitrate can be achieved, enabling potassium nitrate to be reused. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The following further illustrates this application with reference to the drawings and embodiments.
[0024] Figure 1 It is a schematic structural diagram of a potassium nitrate purification production device described in this application;
[0025] Figure 2 It is another schematic structural diagram of a potassium nitrate purification production device described in this application;
[0026] Figure 3 It is a schematic structural diagram between the crusher, dissolution tank, and cooling tank in a potassium nitrate purification production device described in this application;
[0027] Figure 4 It is a schematic diagram of the solubility of potassium nitrate, sodium nitrate, and lithium nitrate described in this application.
[0028] Wherein: 1. Dissolution tank; 2. Cooling tank; 3. First filter; 4. Crusher; 5. Oven; 6. Second filter; 7. Heating mechanism; 8. Cooling mechanism; 9. Promoting dissolution tank. SPECIFIC EMBODIMENTS
[0029] The following will clearly and completely describe the concept, specific structure, and technical effects generated by this application in combination with the embodiments and drawings to fully understand the purpose, features, and effects of this application. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative efforts belong to the scope protected by this application. In addition, all connection / connection relationships involved in the patent do not simply refer to direct connection of components, but refer to more optimal connection structures that can be formed by adding or reducing connection accessories according to specific implementation situations. Each technical feature in this application can be combined interactively without conflicting with each other.
[0030] Such as Figure 1As shown in the figure, a potassium nitrate purification production device includes a dissolution tank 1, the dissolution tank 1 is connected to a cooling tank 2, and the cooling tank 2 is connected to a first filter 3;
[0031] A heating mechanism 7 for heating the dissolution tank 1 is arranged outside the dissolution tank 1;
[0032] A cooling mechanism 8 for cooling the cooling tank 2 is arranged outside the cooling tank 2.
[0033] Specifically, the dissolution tank is used to dissolve waste alkali salt potassium nitrate and other mixtures; the cooling tank is used to cool the solution in the dissolution tank so that potassium nitrate precipitates; the first filter filters the precipitated potassium nitrate feed liquid to obtain a potassium nitrate filter cake, completing the process of extracting potassium nitrate from waste alkali salt potassium nitrate and other mixtures.
[0034] More specifically, the main body of the dissolution tank is of a cylindrical or square structure, and the material is corrosion-resistant stainless steel or fiberglass to ensure that it can withstand high temperatures and the erosion of corrosive solutions; a stirring device such as a stirring paddle or a stirrer is arranged inside the dissolution tank, and the material is also a corrosion-resistant material, which is used to promote the dissolution of waste alkali salt during the heating process.
[0035] The main body of the cooling tank is of a rectangular or circular structure, and the material is also corrosion-resistant stainless steel or fiberglass. For example, cooling pipes or cooling plates are arranged inside the cooling tank to transfer the heat of the cooling medium (such as water or refrigerant) to achieve the cooling of the solution; a discharge port is arranged at the bottom of the cooling tank to discharge the cooled feed liquid to the first filter.
[0036] The first filter is of a vertical or horizontal structure, and a filter screen or a filter layer is arranged inside to filter the precipitated potassium nitrate solid; a feed port is arranged at the top of the filter, and a discharge port and a liquid outlet are arranged at the bottom.
[0037] Therefore, through the above technical solutions, as Figure 4 shown, through the different solubilities of waste alkali salt potassium nitrate and other mixtures in water, by the dissolution separation method, potassium nitrate, sodium nitrate, sodium nitrate in waste alkali salt potassium nitrate and other mixtures, and glass scrap nitrate during the processing are separated; because the solubility of potassium nitrate in water is much lower than that of sodium nitrate and sodium nitrate, when the aqueous solution is at a low temperature, potassium nitrate is more likely to crystallize, that is, when other materials do not crystallize, potassium nitrate has crystallized (when potassium nitrate crystallizes, the water molecules dissolved with this portion of potassium nitrate are vacated and will combine with more soluble sodium nitrate and sodium nitrate to form a new solution); and the potassium nitrate precipitated at this time has the characteristic of high purity, so a potassium nitrate filter cake with higher purity is obtained.
[0038] In some embodiments, the dissolution tank 1 is connected to a crusher 4, and the crusher 4 is used to crush the raw material to be dissolved.
[0039] Specifically, the raw material to be dissolved is waste alkali salt potassium nitrate and other mixtures. A crusher can be used to break up the waste alkali salt potassium nitrate and other mixtures, making it easier to put them into the dissolution tank. Then, water is added to make the raw material to be dissolved dissolve more easily.
[0040] Specifically, the crusher has a vertical or horizontal structure, and is internally provided with crushing blades and a rotating shaft for crushing the raw material to be dissolved into fine particles. The top of the crusher is provided with a feed inlet, and the bottom is provided with a discharge outlet.
[0041] Specifically, the crushed raw material to be dissolved is put into the dissolution tank, and tap water is injected. The weight ratio of water to the crushed raw material to be dissolved is configured as 100:150.
[0042] In some embodiments, when the dissolution tank 1 is performing dissolution, the temperature is 95 - 100 °C.
[0043] Specifically, through a heating mechanism, the temperature in the solution tank is heated to 95 - 100 °C to facilitate the dissolution of the crushed raw material to be dissolved.
[0044] Specifically, the heating mechanism is an independent device or a system integrated on the dissolution tank, including heating elements (such as electric heating tubes, steam heating coils, etc.) and a control device (a temperature controller for setting and adjusting the heating temperature).
[0045] In some embodiments, as Figure 3 shown, the cooling mechanism 8 includes an annular cooling tank 2. The annular cooling tank 2 reduces the temperature of the liquid material in the cooling tank to a preset temperature by circulating external cold water to the outside of the cooling tank.
[0046] In some embodiments, the discharge pipe of the first filter 3 is connected to the oven 5. The oven dries the potassium nitrate filter cake. When the purity of potassium nitrate reaches more than 99.1%, it can be put into use as a molten salt for chemical strengthening.
[0047] In some embodiments, the liquid discharge pipe of the first filter 3 is connected to the feed inlet of the dissolution tank 1.
[0048] Specifically, the filtrate can be recycled to the dissolution tank for dissolving the crushed raw material to be dissolved.
[0049] In some embodiments, the feed inlet of the dissolution tank 1 is connected to the discharge outlet of the dissolution promoting tank 9. Water or other solutions that promote the dissolution of potassium nitrate are placed in the dissolution promoting tank.
[0050] In some embodiments, as Figure 2As shown, the potassium nitrate purification production device further includes a second filter 6. The dissolution tank 1 is connected to the second filter 6, the second filter 6 is connected to the cooling tank 2, and the cooling tank 2 is connected to the first filter 3.
[0051] Specifically, the second filter, as an optional structure, is used to further filter the dissolved liquid between the dissolution tank and the cooling tank to remove large particle impurities therein and improve the subsequent purification effect.
[0052] Therefore, a potassium nitrate purification production device involves the following processes:
[0053] Dissolution process: The waste alkali salt is dissolved in the dissolution tank at a high temperature (95 - 100 °C), and heated by the heating mechanism to fully dissolve components such as potassium nitrate in the alkali salt.
[0054] Cooling process: The dissolved mixture is transferred to the cooling tank and cooled to a low temperature (5 - 10 °C) by the cooling mechanism. Utilizing the significant difference in the solubility of potassium nitrate at different temperatures, potassium nitrate is cooled and precipitated, while sodium nitrate, lithium nitrate, etc. with higher solubility remain in the solution.
[0055] Filtration and drying: The first filter is used to filter the potassium nitrate feed liquid precipitated in the cooling tank to obtain a potassium nitrate filter cake, which is then dried in an oven to obtain high-purity potassium nitrate solid.
[0056] Specifically, for a potassium nitrate purification production device, the production process is as follows:
[0057] First, the waste alkali salt (mainly a mixture of potassium nitrate, sodium nitrate, lithium nitrate, etc.) is fed into a pulverizer. The function of the pulverizer is to crush large pieces or granular raw materials into fine particles for better subsequent dissolution. The crushed raw materials are fed into the dissolution tank through a pipeline. In the dissolution tank, the raw materials are mixed with water in a certain proportion (usually the weight ratio of water to raw materials is 100:150) and heated to 95 - 100 °C by the externally provided heating mechanism to fully dissolve components such as potassium nitrate, sodium nitrate, and lithium nitrate in the raw materials in water to form a uniform solution.
[0058] Next, the dissolved solution enters the cooling tank through a pipeline. The cooling tank is equipped with a cooling mechanism, usually using an annular cooling tank or other efficient cooling methods, to quickly reduce the solution temperature to 5 - 10 °C. Since the solubility of potassium nitrate in water decreases significantly with the decrease in temperature, potassium nitrate begins to precipitate and crystallize under low-temperature conditions, while sodium nitrate, lithium nitrate, etc. with higher solubility continue to remain in the solution. This step is the key to realizing the purification of potassium nitrate.
[0059] The precipitated liquid in the cooling tank then enters the first filter for filtration. The function of the first filter is to separate the precipitated potassium nitrate crystals from the remaining solution to obtain potassium nitrate filter cake. The filter cake contains potassium nitrate with a relatively high purity, but still contains a small amount of moisture and impurities. In order to further improve the purity of potassium nitrate, the filter cake is sent to an oven for drying treatment. The oven removes the moisture and residual impurities in the filter cake by heating, so that the purity of potassium nitrate reaches more than 99.1%, meeting the requirements for the production of chemically strengthened glass.
[0060] In addition, in order to improve the purification efficiency and product quality, a second filter (optional) can also be set between the dissolution tank and the cooling tank in this device. The second filter is used to further remove the suspended solids and impurities in the dissolution liquid, ensuring that the solution entering the cooling tank is purer, thereby reducing the amount of impurities precipitated during the cooling process and improving the purity of potassium nitrate.
[0061] The above is a specific description of the preferred embodiment of this application, but the creation of this application is not limited to the described embodiment. Those skilled in the art can also make various equivalent deformations or substitutions without violating the spirit of this application, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.
Claims
1. A potassium nitrate purification production device, characterized in that, It comprises a dissolving tank (1), wherein the dissolving tank (1) is connected to a cooling tank (2), and the cooling tank (2) is connected to a first filter (3); A heating mechanism (7) for heating the dissolving tank (1) is arranged outside the dissolving tank (1); A cooling mechanism (8) for cooling the cooling tank (2) is arranged outside the cooling tank (2).
2. A potassium nitrate purification production device according to claim 1, characterized in that, The dissolving tank (1) is connected to a pulverizer (4), and the pulverizer (4) is used to pulverize the raw material to be dissolved.
3. A potassium nitrate purification production device according to claim 1, characterized in that, The cooling mechanism (8) comprises an annular cooling groove (2).
4. A potassium nitrate purification production device according to claim 1, characterized in that, The discharge pipe of the first filter (3) is connected to the oven (5).
5. A potassium nitrate purification production device according to claim 1, characterized in that, The liquid outlet pipe of the first filter (3) is connected to the feed inlet of the dissolution tank (1).
6. A potassium nitrate purification production device according to claim 1, characterized in that, The feed port of the dissolution tank (1) is connected to the discharge port of the dissolution-promoting tank (9).
7. A potassium nitrate purification production device according to claim 1, characterized in that, It also includes a second filter (6), the dissolving tank (1) is connected to the second filter (6), the second filter (6) is connected to the cooling tank (2), and the cooling tank (2) is connected to the first filter (3).
8. A potassium nitrate purification production device according to claim 1, characterized in that, The temperature of the dissolving tank (1) during dissolution is 95-100°C.
9. A potassium nitrate purification production device according to claim 1, characterized in that, The temperature of the cooling tank (2) during cooling is 5 to 10°C.