Dust collecting device for potassium sulfate production
By using a spray dust collector in potassium sulfate production, the problems of large dust volume and small particle size were solved, achieving efficient dust recycling and improving the quality and yield of potassium sulfate.
Patent Information
- Application Number
- CN202423040022.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-10
AI Technical Summary
The current potassium sulfate production process generates a large amount of dust with small particle size, resulting in excessively fine materials. This affects the extrusion molding rate and product agglomeration, thus reducing the quality and yield of potassium sulfate.
A spray dust collector was used to replace the bag dust collector, and the dust in the drying and granulation processes was treated separately. The dust was concentrated during the drying process and then sent to the crystallization kettle for recrystallization. The dust collected during the granulation process was used for granulation.
It effectively reduced the proportion of fine materials during the granulation process, reduced the clumping of finished potassium sulfate, and improved product quality and yield.
Smart Images
Figure CN223587966U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to potassium sulfate production technical field, concretely relates to a dust collecting device for potassium sulfate production. BACKGROUND
[0002] Potassium sulfate is an inorganic salt, chemical formula is K2SO4, white crystalline powder, is widely used in various fields, and is used as water-soluble potassium fertilizer and main raw material of chlorine-free nitrogen, phosphorus and potassium ternary compound fertilizer in agriculture due to small hygroscopicity, not easy to caking, good physical properties and convenient application characteristics.
[0003] At present, potassium sulfate is mainly prepared by using Mannheim method under certain conditions by taking potassium chloride and sulfuric acid solution as raw materials, and the reacted solution is filtered, crystallized, settled, centrifuged, dried and granulated to obtain finished product. Because a large amount of dust is generated in the drying and granulating processes, it is necessary to recycle the dust to ensure yield and environmental safety. The commonly used method is to collect the dust from the two places and then transport it to the granulator for recycling. However, the following problems may occur: 1. The amount of dust collected from the two places is large, and the particle size is very small. When the dust is reused for granulation, the proportion of fine material in the material increases, which makes the material too fine, resulting in a decrease in the pre-pressing screw air removal effect, rapid air discharge from the surface of the material re-pressing roller and a decrease in the extrusion molding rate; 2. Because the particle size of the dust is small and the water content is high, when the fine powder is mixed with the finished product, the contact area of the product increases, which causes an increase in the salt bridge between particles. The salt bridge formed by the fine powder between the potassium sulfate particles connects the large particles together, which causes the potassium sulfate to caking after packaging. The above problems seriously affect the quality and yield of the product. SUMMARY
[0004] The technical problem to be solved by the utility model is to provide a dust collecting device for potassium sulfate production, which is simple and reasonable in design, can better recycle the potassium sulfate dust generated in production, and improve the quality and yield of potassium sulfate.
[0005] To solve the above technical problems, the technical scheme of the utility model is as follows:
[0006] A dust collecting device for potassium sulfate production, comprising a reaction kettle, a crystallization kettle, a washing kettle, a filter, a drying machine and a granulator which are sequentially connected by a pipeline, a pump and a valve; a spray type dust collector is arranged above the drying machine, the liquid outlet of the spray type dust collector is connected to the feed inlet of the crystallization kettle through a pipeline and a concentration kettle; a bag type dust collector is arranged above the granulator, and the solid material outlet of the bag type dust collector is connected to the feed inlet of the granulator through a screw conveyor.
[0007] Preferably, the reaction kettle is provided with heat exchange device and stirring device, and is also provided with solid material inlet and liquid material inlet.
[0008] Preferably, the crystallization kettle is provided with heat exchange device and stirring device.
[0009] Preferably, the spray dust collector comprises a gas collecting hood, the gas collecting hood is connected to the air inlet at the lower part of the spray tower through a pipeline, the spray tower is provided with an air outlet at the top, the air outlet is connected to the tail gas treatment system through a pipeline and an induced draft fan, the spray tower is provided with a spraying pipe at the upper part of the inner cavity, the spraying pipe is connected to an externally provided water supply device, and the liquid outlet at the bottom of the spray tower is connected to the feed inlet of the crystallization kettle through a pipeline.
[0010] Preferably, the concentration kettle is provided with heat exchange device and stirring device.
[0011] Preferably, the upper part of the bag-type dust collector is connected to the tail gas treatment system through an air outlet pipe and an induced draft fan, the air inlet at the lower part of the bag-type dust collector is connected to the top of the granulator through a pipeline, and the solid material outlet of the bag-type dust collector is connected to the feed inlet of the granulator through a screw conveyor.
[0012] Due to the adoption of the above technical scheme, the present application has the following beneficial effects:
[0013] The bag-type dust collector originally arranged above the drying machine is replaced by the spray dust collector in the present application, and the dust generated in the drying process is collected and concentrated by the spray dust collector and then delivered to the crystallization kettle for recrystallization.
[0014] Therefore, the present application has the advantages of simple and reasonable design, good recycling of the potassium sulfate dust generated in the production, and improved quality and yield of the potassium sulfate. BRIEF DESCRIPTION OF DRAWINGS
[0015] The present application will be further described below in combination with the drawings and examples.
[0016] Figure 1 is a structural schematic view of the embodiment 1 of the present application.
[0017] In the figure, 1, reaction kettle; 2, crystallization kettle; 3, washing kettle; 4, filter; 5, drying machine; 6, granulator; 7, spray dust collector; 8, concentration kettle; 9, bag dust collector. DETAILED DESCRIPTION
[0018] The utility model is further explained below in combination with the drawings and examples.
[0019] Example 1
[0020] As Figure 1 shown in the figure, a dust collecting device for potassium sulfate production, including reaction kettle 1, crystallization kettle 2, washing kettle 3, filter 4, drying machine 5 and granulator 6 that are sequentially communicated through pipeline (not marked), pump (not marked) and valve (not marked); the upper portion of drying machine 5 is equipped with spray dust collector 7, the liquid outlet of spray dust collector 7 is communicated to the feed inlet of crystallization kettle 2 through pipeline and concentration kettle 8; the upper portion of granulator 6 is equipped with bag dust collector 9, the solid material outlet of bag dust collector 9 is communicated to the feed inlet of granulator 6 through screw conveyor (not marked).
[0021] In actual production, potassium bisulfate is first loaded into reaction kettle 1, and then a proper amount of deionized water is input to dissolve, and then potassium chloride in an equimolar number with potassium bisulfate is added, heated to 90 DEG C to react for one hour, and the stirring speed in the reaction process is 60 r / min; after the reaction is completed, the liquid material is transported to crystallization kettle 2 to cool to room temperature to crystallize, the potassium sulfate solid separated out is then transported to washing kettle 3 to be washed with saturated potassium sulfate solution, and then transported to filter 4 to be filtered, and then the filtered crystal is transported to drying machine 5 to be dried at 50 DEG C to obtain potassium sulfate, and then transported to granulator 6 to be granulated to make potassium sulfate particles; the powder generated in the drying process is collected by spray dust collector 7 and forms a solution to be transported to concentration kettle 8 to be concentrated first, and when the solid content of the solution is equivalent to the solid content of the material after reaction in reaction kettle 1, it is transported to crystallization kettle 2 to be crystallized together to continue processing; and the dust collected in the granulation process can only be collected again to be granulated again because of the presence of additives, so the original production process is unchanged here, and the dust collected by bag dust collector 9 is transported to granulator 6 to be granulated again through screw conveyor.
[0022] It should be understood that the examples are only used to illustrate the utility model and not to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the claims attached to the present application.
Claims
1. A dust collecting device for potassium sulfate production, characterized by: It comprises a reaction kettle, a crystallization kettle, a washing kettle, a filter, a drying machine and a granulator connected in sequence through pipes, pumps and valves; a spray dust remover is arranged above the drying machine, a liquid outlet of the spray dust remover is connected to a feed inlet of the crystallization kettle through a pipe and a concentration kettle; a bag dust remover is arranged above the granulator, and a solid material outlet of the bag dust remover is connected to a feed inlet of the granulator through a screw conveyor.
2. The dust collecting device for potassium sulfate production according to claim 1, characterized by: The reaction kettle is provided with heat exchange devices and stirring devices, and is also provided with a solid material inlet and a liquid material inlet; the solid material inlet is connected to a potassium bisulfate storage tank and a potassium chloride storage tank through pipes respectively; and the liquid material inlet is connected to a water storage tank through a pipe.
3. The dust collecting device for potassium sulfate production according to claim 1, characterized in that: The crystallization kettle is provided with heat exchange devices and stirring devices.
4. The dust collecting device for potassium sulfate production according to claim 1, characterized by: The spray dust remover comprises a gas collecting hood connected to an air inlet at a lower part of a spray tower through a pipe; an air outlet is arranged at a top part of the spray tower and is connected to an exhaust gas treatment system through a pipe and an air blower; a spray pipe is arranged at an upper part of an inner cavity of the spray tower and is connected to an externally arranged water supply device.
5. The dust collecting device for potassium sulfate production according to claim 1, characterized in that: The concentration kettle is provided with heat exchange devices and stirring devices.
6. The dust collecting device for potassium sulfate production according to claim 1, characterized by: The bag dust remover is connected to the exhaust gas treatment system through an air outlet pipe and an air blower at an upper part thereof, and an air inlet at a lower part thereof is connected to a top part of the granulator through a pipe.