A new device for preparing lime milk

Abstract

The utility model discloses a novel lime emulsion preparation device belongs to lime milk slurry technical field, adopts vertical spiral stirring mill integration to complete digestion and grinding, and is provided with two -stage separation system that constitutes by spiral classifier and hydrocyclone, and the coarse particle that hydrocyclone separates is backflowed to stirring mill and grinds again, the overflow end of spiral classifier, the feed end between horizontal centrifugal pump with hydrocyclone is combined through the mode of communicating in proper order, and the underflow end of hydrocyclone is backflowed and is connected to vertical spiral stirring mill, the utility model has the advantages of can efficiently prepare the lime emulsion of good quality even, fineness, effectively prevent the wear and tear and jam of coarse particle to subsequent equipment, and the compact structure of device, low energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of lime slurry technology, and in particular to a novel lime slurry preparation device. Background Technology

[0002] Lime slurry, also known as calcium hydroxide suspension, is an important alkaline chemical raw material widely used in many industrial fields such as flue gas desulfurization, wastewater treatment, metallurgy, and chemical synthesis. Its preparation process involves the digestion reaction of quicklime (mainly calcium oxide) with water. In practical applications, the quality of lime slurry, especially the fineness and uniformity of its particles, directly determines its chemical reactivity and efficiency, and affects the stable operation of subsequent process pipelines and equipment.

[0003] In the traditional lime slurry preparation process, lumpy quicklime is first reacted with water in a slaking machine to complete the initial slaking process. However, the lime slurry that has only undergone slaking contains a large number of incompletely reacted hard particles, impurities, and large agglomerates caused by uneven reaction. In order to obtain the fineness required by the process, this initially slaking slurry needs to be transported to a separate grinding equipment, such as a ball mill, for secondary grinding. This process, which separates slaking and grinding into two independent steps, not only requires the configuration of two main sets of equipment for slaking and grinding, resulting in a large footprint and a lengthy process flow, but also increases the transportation links between equipment, leading to higher energy consumption.

[0004] More importantly, even after grinding, in order to ensure the uniformity of the final product quality, the ground emulsion needs to be classified to remove unqualified coarse particles. Existing classification methods mostly use simple screens or settling tanks, which have limited classification accuracy and low efficiency. This results in a considerable number of coarse particles remaining in the final product. These particles not only significantly reduce the reaction rate of lime emulsion in application, but also cause serious wear to subsequent pumps, valves and nozzles, and even cause blockages, leading to production interruptions.

[0005] Therefore, this utility model proposes a novel lime slurry preparation device to overcome the shortcomings of the prior art. Utility Model Content

[0006] In view of the problems in the existing technology of a new lime slurry preparation device, such as the separation of digestion and grinding processes leading to a long process flow and large footprint, as well as the problems of low grading accuracy leading to unstable quality of finished slurry and easy wear and tear on subsequent equipment, this utility model aims to provide a new lime slurry preparation device with an improved structure that can effectively solve the above problems.

[0007] This utility model provides a novel lime slurry preparation device, comprising: a vertical spiral stirred mill and a spiral classifier; as well as a hydrocyclone and a horizontal centrifugal pump.

[0008] Furthermore, the overflow end of the spiral classifier, the horizontal centrifugal pump, and the feed end of the hydrocyclone are connected in sequence, while the underflow end of the hydrocyclone is connected back to the vertical spiral stirring mill.

[0009] Preferably, the product name also includes a stirring tank, which is disposed between the vertical spiral mixer and the spiral classifier, for buffering and mixing the initially formed lime slurry.

[0010] Furthermore, the product name also includes a wet scrubber, which is located at the top of the mixing tank for washing away water vapor generated during lime digestion.

[0011] Preferably, the product name also includes a pump pool, which is disposed between the overflow end of the spiral classifier and the inlet of the horizontal centrifugal pump, for providing a stable feed to the horizontal centrifugal pump.

[0012] Preferably, the product name also includes a mixing tank, which is located at the overflow end of the hydrocyclone for collecting and storing qualified finished lime slurry.

[0013] Preferably, the product name also includes a dewatering screen, which is installed at the slag discharge end of the spiral classifier for dewatering the separated coarse slag.

[0014] Furthermore, the product name also includes a vertical slurry pump, which is used to transport the water separated by the dewatering screen back to the spiral classifier.

[0015] As one specific implementation, the product name also includes a raw material supply and crushing system, which includes a discharge hopper, a plate feeder, a belt conveyor, and a crusher. The discharge end of the crusher is connected to the feed end of the vertical spiral mixing mill via a belt conveyor.

[0016] Furthermore, the product name also includes pulse dust collector one, dust collector fan one, pulse dust collector two, and dust collector fan two, which are used to collect the dust generated during the operation of the raw material supply crushing system.

[0017] This utility model has the following beneficial effects: 1. This utility model solves the problems of low classification efficiency, high coarse particle content in the finished emulsion, and unstable quality in the prior art by setting up a two-stage classification system consisting of a spiral classifier and a hydrocyclone, and returning the unqualified coarse particles separated by the hydrocyclone to the vertical spiral stirred mill for re-grinding to form a closed-loop circulation. It achieves the technical effect of significantly improving classification accuracy, ensuring that the final lime emulsion has uniform particle size, good fineness, and high quality, thereby reducing wear and blockage of subsequent pipelines and equipment.

[0018] 2. This utility model integrates the digestion and grinding processes of quicklime into the same equipment and completes them simultaneously by using a vertical spiral stirring mill. This solves the problems of long process flow, large equipment footprint, and high energy consumption caused by the separation of digestion and grinding processes in the prior art. It achieves the technical effects of simplifying the production process, shortening the process, significantly reducing the equipment footprint, and reducing system energy consumption.

[0019] 3. This utility model solves the problem of incomplete treatment of solid dust and dust-containing water vapor generated during the production process and the environmental risks in the prior art by systematically configuring multiple sets of pulse dust removal devices and wet scrubbers in the material conveying, crushing and digestion and grinding stages. It achieves the technical effect of effective environmental control of the entire production process, clean production and improved working environment. Attached Figure Description

[0020] Figure 1 This is a front view of a novel lime slurry preparation apparatus proposed in this utility model; Figure 2 This is a partial structural exploded view of the belt conveyor of a novel lime slurry preparation device proposed in this utility model; Figure 3 This is a partial structural diagram of a vertical spiral stirred mill, which is part of a novel lime slurry preparation device proposed in this utility model. Figure 4 This is a process flow diagram of a novel lime slurry preparation device proposed in this utility model.

[0021] Legend: 1. Unloading hopper; 2. Plate feeder; 3. Pulse dust collector I; 4. Dust collector fan I; 5. Belt conveyor I; 6. Pulse dust collector II; 7. Dust collector fan II; 8. Crusher; 9. Belt conveyor II; 10. Vertical spiral mixer mill; 11. Mixing tank; 12. Spiral classifier; 13. Dewatering screen; 14. Vertical slurry pump; 15. Pump pool; 16. Horizontal centrifugal pump; 17. Hydrocyclone; 18. Mixing tank; 19. Conveyor vehicle; 20. Wet scrubber. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0023] Example: Please refer to Figures 1 to 4 This utility model provides a novel lime slurry preparation device, which aims to solve the problems of long lime slurry preparation process, poor grading effect leading to unstable finished product quality and easy wear and blockage of equipment in the prior art.

[0024] like Figure 1 and Figure 3 As shown, the novel lime slurry preparation device includes a vertical spiral stirred mill 10 and a spiral classifier 12 connected downstream of the vertical spiral stirred mill 10. The vertical spiral stirred mill 10 is used to digest and grind quicklime raw materials to prepare a preliminary lime slurry, while the spiral classifier 12 is used to perform primary sorting on the preliminary lime slurry to separate coarse particles.

[0025] To solve the above-mentioned technical problems, the technical solution of this embodiment is that the novel lime slurry preparation device further includes a hydrocyclone 17 and a horizontal centrifugal pump 16, and the hydrocyclone 17 and the horizontal centrifugal pump 16 form a specific fluid transport and circulation connection relationship with the aforementioned vertical spiral stirred mill 10 and spiral classifier 12.

[0026] Please refer to Figure 1 , Figure 3 and Figure 4 The structure will be described in detail below: The hydrocyclone 17 has a cavity structure with a cylindrical upper part and a conical lower part. Its upper side wall is provided with a tangential feed port, the top is provided with an overflow outlet, and the bottom is provided with an underflow outlet. A horizontal centrifugal pump 16 is set between the spiral classifier 12 and the hydrocyclone 17. Its function is to provide the required pressure and flow rate for the lime slurry to enter the hydrocyclone 17.

[0027] Meanwhile, the overflow end of the spiral classifier 12 is connected to the inlet of the horizontal centrifugal pump 16 through a pipe, and the outlet of the horizontal centrifugal pump 16 is connected to the tangential feed port of the hydrocyclone 17 through a pipe. In operation, the emulsion overflowing from the spiral classifier 12 is pressurized by the horizontal centrifugal pump 16 and sent into the hydrocyclone 17 for fine separation. The underflow outlet of the hydrocyclone 17 is connected to the feed end of the vertical spiral stirred mill 10 through a return pipe. This closed-loop circulation structure, powered by the horizontal centrifugal pump 16, sends the emulsion after primary separation into the hydrocyclone 17 for fine separation and returns unqualified coarse particles to the front end of the grinding equipment, ensures that the final lime emulsion has uniform particle size and high quality, while maximizing the utilization rate of raw materials and avoiding wear and blockage of subsequent equipment by coarse particles.

[0028] For the installation of pipes and valves connecting various devices, those skilled in the art can use a variety of conventional methods. Based on the above embodiments, the present invention may further include the following preferred technical solutions: As a preferred embodiment, in order to achieve buffering and stable mixing of materials, please refer to... Figure 1 and Figure 3 The device also includes a mixing tank 11, the overflow outlet of the vertical spiral mixing mill 10 is connected to the mixing tank 11, and the outlet of the mixing tank 11 is connected to the spiral classifier 12.

[0029] As a more specific implementation method, in order to handle the dust-containing water vapor generated during the digestion process and prevent environmental pollution, please refer to... Figure 1 and Figure 3 The device also includes a wet scrubber 20, which is fixedly installed on the top of the mixing tank 11.

[0030] As a preferred embodiment, in order to provide a stable liquid level and feed conditions for the horizontal centrifugal pump 16, please refer to... Figure 1 and Figure 3 The device also includes a pump pool 15, the overflow end of the spiral classifier 12 is connected to the pump pool 15 through a pipe, and the inlet of the horizontal centrifugal pump 16 is connected to the pump pool 15.

[0031] As a preferred embodiment, for collecting and storing qualified finished lime slurry, please refer to... Figure 1 and Figure 3 The device also includes a mixing tank 18, and the overflow end of the hydrocyclone 17 is connected to the mixing tank 18 via a pipe.

[0032] As a preferred embodiment, in order to dewater the coarse slag separated by the spiral classifier 12 and facilitate the discharge of dry slag, please refer to... Figure 1 and Figure 3The device also includes a dewatering screen 13, and the slag discharge end of the spiral classifier 12 is connected to the dewatering screen 13.

[0033] As a further improvement to the above embodiment, in order to recover the water resources separated by the dewatering screen 13 and achieve recycling, please refer to... Figure 1 and Figure 3 The device also includes a vertical slurry pump 14, through which the water separated by the dewatering screen 13 is pumped back to the spiral classifier 12.

[0034] As a preferred embodiment, in order to achieve automated and continuous feeding and crushing of lumpy quicklime raw materials, please refer to... Figure 1 , Figure 2 and Figure 4 The device also includes a raw material supply and crushing system, which includes a discharge hopper 1, a plate feeder 2, a belt conveyor 5, a crusher 8, and a belt conveyor 9. The discharge hopper 1, the plate feeder 2, and the belt conveyor 5 are connected in sequence to transport the raw material to the crusher 8. The discharge end of the crusher 8 is connected to the feed end of the vertical spiral mixing mill 10 through the belt conveyor 9, and a conveyor car 19 is provided at the end of the belt conveyor 9.

[0035] As a further improvement to the above implementation method, in order to effectively control the dust generated during the feeding and crushing process and achieve clean production, please refer to... Figure 1 and Figure 2 The device also includes a pulse dust collector 3, a dust collector fan 4, a pulse dust collector 6, and a dust collector fan 7. The pulse dust collector 3 and the dust collector fan 4 are used together to collect dust in the areas of the plate feeder 2 and the belt conveyor 5. The pulse dust collector 6 and the dust collector fan 7 are used together to collect dust in the feeding areas of the belt conveyor 9 and the vertical spiral mixer mill 10.

[0036] Working Principle: A grab bucket crane or loader unloads lumpy quicklime into unloading hopper 1, which is then fed by plate feeder 2. The quicklime is conveyed to crusher 8 via plate feeder 2 and belt conveyor 5. Simultaneously, dust collector fan 4 is activated, driving pulse dust collector 3 for dust removal. The quicklime is then conveyed to vertical spiral mixer mill 10 via conveyor car 19 on belt conveyor 9. Dust collector fan 7 is activated, driving pulse dust collector 6 for dust removal. Water is added to the vertical spiral mixer mill 10, where the quicklime completes its digestion process. The resulting lime slurry, containing coarse particles, overflows into mixing tank 11, where it is stirred. The water vapor generated by the exothermic reaction of the lime digestion is released through a top wet steam filter. The washing unit 20 washes the lime slurry containing coarse particles, which overflows into the spiral classifier 12. Under the stirring action of the classifier, the coarse particles are separated and enter the dewatering screen 13 for dewatering. The coarse particles are discharged into the slag box for collection. The water separated by the dewatering screen 13 flows into the sewage pit through the ditch and is transported back into the spiral classifier 12 by the vertical slurry pump 14. The lime slurry overflowing from the spiral classifier 12 enters the pump pool 15 and is transported into the hydrocyclone 17 for classification by the horizontal centrifugal pump 16. The overflow from the hydrocyclone 17 is the lime slurry with qualified particle size, which then falls into the mixing tank 18. The underflow of the hydrocyclone 17 is the lime slurry with unqualified particle size, which flows back into the vertical spiral stirred mill 10. This process achieves the preparation of lime slurry with good fineness and high quality, reduces wear on pipes and equipment, reduces blockage, and has a small footprint and low energy consumption.

Claims

1. A novel lime slurry preparation apparatus, comprising: A vertical spiral stirred mill (10) and a spiral classifier (12), wherein the spiral classifier (12) is connected to the discharge end of the vertical spiral stirred mill (10); Its features include a hydrocyclone (17) and a horizontal centrifugal pump (16). The overflow end of the spiral classifier (12) is connected to the feed end of the hydrocyclone (17) through the horizontal centrifugal pump (16), and the underflow end of the hydrocyclone (17) is connected back to the vertical spiral stirring mill (10).

2. The novel lime slurry preparation apparatus according to claim 1, characterized in that, It also includes a stirring tank (11), the overflow outlet of the vertical spiral stirring mill (10) is connected to the stirring tank (11), and the outlet of the stirring tank (11) is connected to the spiral classifier (12).

3. The novel lime slurry preparation apparatus according to claim 2, characterized in that, It also includes a wet scrubber (20) and a conveyor (19), the wet scrubber (20) being disposed on top of the mixing tank (11).

4. The novel lime slurry preparation apparatus according to claim 1, characterized in that, It also includes a pump pool (15), the overflow end of the spiral classifier (12) is connected to the pump pool (15), and the inlet of the horizontal centrifugal pump (16) is connected to the pump pool (15).

5. The novel lime slurry preparation apparatus according to claim 1, characterized in that, It also includes a mixing tank (18), the overflow end of which is connected to the mixing tank (18).

6. The novel lime slurry preparation apparatus according to claim 1, characterized in that, It also includes a dewatering screen (13), and the slag discharge end of the spiral classifier (12) is connected to the dewatering screen (13).

7. The novel lime slurry preparation apparatus according to claim 6, characterized in that, It also includes a vertical slurry pump (14), through which the water separated by the dewatering screen (13) is pumped back to the spiral classifier (12).

8. The novel lime slurry preparation apparatus according to claim 1, characterized in that, It also includes a raw material supply crushing system, which includes a hopper (1), a plate feeder (2), a belt conveyor (5) and a crusher (8). The discharge end of the crusher (8) is connected to the feed end of the vertical spiral mixing mill (10) via a belt conveyor (9).

9. A novel lime slurry preparation apparatus according to claim 8, characterized in that, It also includes a pulse dust collector (3), a dust removal fan (4), a pulse dust collector (6), and a dust removal fan (7) for collecting dust generated by the raw material supply crushing system.

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