High-quality slaked lime preparation system and process integrating screening and powder selecting

Abstract

The invention relates to the technical field of lime finished product preparation, in particular to a high-quality slaked lime preparation system and process integrating screening and powder selecting. The system comprises a material receiving workshop section, a crushing workshop section, a screening workshop section, a digestion workshop section, a grinding workshop section and a finished product workshop section which are sequentially connected, and a material closed loop is formed through conveying equipment. A double-layer screening machine is arranged to classify the crushed materials, oversize materials are returned to be crushed, oversize materials are selectively supplied to a digestion or grinding section, and undersize materials are directly used as products; a powder concentrator is arranged behind the digestion section, and high-purity slaked lime and slag are separated; and the digestion slag and the quick lime can be mixed and ground into special powder in the grinding section. According to the invention, full-process automation and multi-product co-production of slaked lime production are realized, the problems of low product purity, raw material waste and insufficient intelligent degree of a traditional process are solved, and the method has the advantages of high efficiency, excellent quality, high resource utilization rate and environmental friendliness.

Description

Technical Field

[0001] This invention relates to the field of lime product preparation technology, and in particular to a high-quality slaked lime preparation system and process that integrates screening and powder selection. Background Technology

[0002] Lime is an air-hardening inorganic cementing material with calcium oxide as its main component. It is produced by calcining limestone and other raw materials at high temperatures and is widely used in many fields such as construction, metallurgy, chemical industry, environmental protection, flue gas desulfurization, and wastewater treatment. Quicklime (mainly CaO) reacts with water to produce slaked lime (calcium hydroxide, Ca(OH)2), which is one of the important ways in which lime products are applied.

[0003] Currently, the industrial production of slaked lime (hydrated lime) mainly employs the slaking process. This process has advantages such as a relatively simple flow, mild reaction conditions, and no toxic byproducts. A typical process involves mixing and stirring lumpy quicklime with water in a certain proportion in a slaking tank, and obtaining hydrated lime product after the chemical reaction is completed.

[0004] However, in actual production applications, the existing lime digestion production process still has the following significant technical defects, which restrict the further improvement of product quality, production efficiency, and resource utilization: 1. Inaccurate raw material particle size control affects digestion completeness and equipment lifespan: The quicklime raw materials entering the digester are often not strictly crushed and graded, resulting in a wide particle size distribution. Excessively large particles (usually >20mm) have a small specific surface area, leading to insufficient reaction with water and difficulty in digesting the core, forming unreacted "raw cores" (under-burned or over-burned hard cores) in the final product. This not only directly reduces the content and activity of effective calcium hydroxide in the product, affecting the uniformity and stability of product quality, but also exacerbates mill wear in subsequent grinding stages.

[0005] 2. Inefficient slag separation methods result in low product purity and wasteful byproducts: Quicklime raw materials often contain impurities such as incompletely decomposed limestone, coal ash, and overburned silicates (collectively referred to as "slag"). Existing processes lack dedicated and efficient separation equipment (such as air classifiers), or simply screen after slaking, resulting in poor separation. A large amount of slag is mixed in with the finished hydrated lime, significantly reducing the product's purity, whiteness, and chemical activity. Furthermore, the disposal of this waste slag as solid waste not only increases the environmental burden but also wastes some of the effective components in the raw materials (such as incompletely digested calcium oxide).

[0006] 3. Insufficient automation and intelligence in the process flow, resulting in extensive production control: Existing production lines operate relatively independently, with logistics relying heavily on manual judgment and operation. Key aspects such as raw material crushing particle size, feed ratio and flow rate, the diversion of intermediate products of different qualities (e.g., to digestion, grinding, or as finished products), and final product warehousing and scheduling lack real-time, online monitoring and feedback-based automatic closed-loop control. This leads to poor production stability, large fluctuations in product quality, difficulty in flexibly adjusting product structure according to market demand (e.g., the ratio of quicklime powder, hydrated lime, and desulfurization agent powder), high labor costs, and bottlenecks in production efficiency. Summary of the Invention

[0007] To overcome the shortcomings of the existing technology, this invention provides a high-quality slaked lime preparation system and process integrating screening and powder selection. This achieves automated and highly efficient slaked lime preparation, ensuring diversified and high-quality production, and achieving efficient utilization of raw materials while being environmentally friendly.

[0008] To achieve the above objectives, the present invention employs the following technical solution: A high-quality slaked lime preparation system integrating screening and powder selection includes a receiving section, a crushing section, a screening section, a slaked lime section, a grinding section, and a finished product section connected in sequence. The outlet of the receiving section is connected to the crusher feed hopper of the crushing section via a lime conveying device. The outlet of the crushing section is connected to the screening machine of the screening section via a crushing conveying device. The screening section has three discharge ports, which are respectively connected back to the crusher feed hopper via an oversize conveying device, connected to the slaked lime feed hopper of the digestion section and the grinding lime feed hopper of the grinding section via a mediumsize conveying device, and connected to the finished product section via an undersize conveying device. The outlet of the digestion section is connected to the finished product section via a finished product conveying device and simultaneously connected to the grinding section via a slag conveying device. The outlet of the grinding section is connected to the finished product section via a lime / slag powder conveying device and a reagent conveying device.

[0009] Furthermore, the screening machine is a double-layer screening machine, with the upper screen having an aperture of 15~25mm and the lower screen having an aperture of 2~4mm.

[0010] Furthermore, the digestion section also includes a classifier for separating the mixture from the digester into quicklime and slag; the quicklime outlet of the classifier is connected to the finished product conveying equipment, and its slag outlet is connected to the slag conveying equipment.

[0011] Furthermore, the digestion section also includes a metering belt scale installed on the digestion conveying equipment. The metering belt scale is connected to a speed-regulating motor signal and is used to adjust the feed amount to the digester based on weighing feedback.

[0012] Furthermore, the grinding section also includes a slag silo; the system is configured to convey materials from the grinding feed silo via a first grinding conveying device and materials from the slag silo via a second grinding conveying device to the grinding mill in an adjustable ratio.

[0013] Furthermore, the finished product section includes a quicklime finished product silo, a hydrated lime finished product silo, and a reagent finished product silo arranged side by side; the quicklime finished product silo is connected to the screened material conveying equipment, the hydrated lime finished product silo is connected to the finished product conveying equipment, and the reagent finished product silo is connected to the reagent conveying equipment.

[0014] Furthermore, the quicklime finished product silo, hydrated lime finished product silo, reagent finished product silo, digestion feed silo, and grinding feed silo are all equipped with a 3D radar level monitoring system; the conveying destinations of the screen material conveying equipment and the finished product conveying equipment are configured to automatically switch based on the signals from the 3D radar level monitoring system.

[0015] Furthermore, the lime conveying equipment, crushing conveying equipment, screen material conveying equipment, screen medium material conveying equipment, and screen under material conveying equipment are belt conveyors, and dust removal equipment is equipped at their material transfer points or generation points. During the production process, dust removal equipment is activated at each material conveying and transfer station to collect dust.

[0016] A high-quality slaked lime preparation process integrating screening and powder selection, employing the above-mentioned system, includes the following steps: S1: After being crushed in the crushing section, quicklime raw material is sent to the screening section for screening. S2: The oversize material obtained from screening is returned to the crushing section for further crushing, and the undersize material is sent to the finished product section for storage as quicklime; the medium-sized material is selectively transported to the digestion section or the grinding section. S3: The sieved material is fed to the digestion section for digestion reaction. The mixture after reaction is separated by powder selection to obtain quicklime product and slag. The quicklime product is sent to the finished product section for storage, and part of the slag is sent to the grinding section. S4: The materials conveyed to the grinding section include the screen material from step S2 and the slag material from step S3. After grinding, the powder product is obtained and sent to the finished product section for storage.

[0017] Furthermore, in step S3, the flow rate of the material being fed into the digestion section is monitored and controlled in real time by a metering belt scale.

[0018] Furthermore, in step S4, the feeding ratio of quicklime material to slag material entering the grinding section is controlled by adjusting the flow rate recorded on the corresponding conveying equipment.

[0019] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention achieves fully automated and intelligent production, significantly improving efficiency and reducing costs. Unlike traditional discrete production that relies on manual intervention, this invention integrates crushing, screening, digestion, powder selection, grinding, and storage stages with specific material flow directions. It is equipped with a quantitative feeding system based on metering belt scales, a real-time material level monitoring system based on 3D radar, and an automatic conveying path switching system, constructing a closed-loop system that can operate and adjust autonomously. This "perception-decision-execution" intelligent control system significantly reduces manual operation and judgment errors, enabling the production line to operate continuously, stably, and efficiently. This, in turn, reduces labor costs while significantly improving overall production efficiency and product packaging speed.

[0020] 2. This invention achieves a synergistic output of diversified and high-quality products, expanding the application market. Existing technologies are typically single-function and struggle to accommodate products of different forms and specifications. This invention deeply couples the digestion and grinding systems, using a precise double-layer sieve at the front end as the control hub. The qualified particle size material from the sieve is supplied to the digestion section, where it undergoes digestion and effective separation by a key classifier to directly obtain high-purity quicklime (calcium hydroxide content > 90%, moisture ≤ 1%). Simultaneously, the undersize material can be directly used as quicklime powder, while the slag separated by the classifier and some of the undersize material can enter the grinding system. By adjusting the conveying rate, quicklime and slag can be mixed in any proportion and finely ground to produce special powders such as desulfurization agent powder with controllable composition. This flexible multi-product co-production model based on the same raw material source achieves a leap from a single product to a product matrix, enhancing market adaptability.

[0021] 3. A near-zero waste recycling system for raw materials has been established, resulting in significant economic and environmental benefits. In traditional processes, impurities (slag) in raw materials are typically discarded as waste, polluting the environment and wasting resources. This invention introduces a powder separation process, directing the separated slag to the grinding section as one of the raw materials. This not only directly improves the purity of the main quicklime product but also transforms what was traditionally considered "waste" into effective components of reagents with desulfurization and other functions, forming a complete material closed loop of "raw materials—main product—by-product (slag)—recycled resources (reagents)". This brings the comprehensive utilization rate of raw materials close to 100%, reducing solid waste generation at the source and achieving cleaner production.

[0022] 4. Through precise optimization of the process, the quality and consistency of the final product are fundamentally guaranteed. Addressing the pain point of existing processes where uneven raw material particle size leads to incomplete digestion and the formation of a "raw core," this invention incorporates a pre-processing crushing and rigorous double-layer screening to ensure that the particle size of the material entering the digester is precisely controlled within the optimal reaction range (e.g., below 20mm). This measure significantly increases the contact surface area between quicklime and water, promoting a faster and more thorough digestion reaction, thereby eliminating the "raw core" phenomenon in the finished product and ensuring high activity and high content of the hydrated lime. Simultaneously, the dust removal equipment throughout the production line effectively controls dust emissions during production, achieving environmentally friendly production.

[0023] In summary, this invention organically integrates three major technical means—"integrated system design," "introduction of key powder separation processes," and "intelligent logistics control"—to achieve synergistic enhancements in efficiency, diversified products, resource recycling, and quality control. Attached Figure Description

[0024] Figure 1 This is a process flow diagram of the present invention.

[0025] Figure 2 This is a schematic diagram of the structure of the present invention.

[0026] In the diagram: 11. Quicklime feeding trough; 12. Lime conveying equipment; 21. Crusher feeding bin; 22. Crusher; 23. Crushing and conveying equipment; 31. Screening machine; 32. On-screen material conveying equipment; 33. On-screen material conveying equipment; 34. Under-screen material conveying equipment; 41. Digestion feeding bin; 42. Digestion conveying equipment; 43. Digester; 44. Semi-finished product conveying equipment; 45. Air classifier; 46. Slag conveying equipment; 47. Finished product conveying equipment; 51. Grinding mill feeding bin; 52. First grinding mill conveying equipment; 53. Grinding mill; 54. Powder collector; 55. Reagent conveying equipment; 56. Lime / slag powder conveying equipment; 57. Slag silo; 58. Second grinding mill conveying equipment; 61. Quicklime finished product silo; 62. Hydrated lime finished product silo; 63. Reagent finished product silo; 64. Packaging machine. Detailed Implementation

[0027] The embodiments of the present invention are described in detail below. To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figure 1 and Figure 2 As shown in the figure, this invention provides a high-quality slaked lime preparation system integrating screening and powder selection. The system mainly includes a receiving section, crushing section, screening section, slaked lime section, grinding section, and finished product section connected in sequence, and achieves automatic material conveying and distribution through intelligent control.

[0029] I. System Composition and Connections 1. The receiving section includes a quicklime feeding trough 11. The quicklime feeding trough 11 is used to receive lumpy quicklime raw materials transported by trucks outside the plant or by the kiln conveying equipment inside the plant. Its outlet is connected to the crushing section via a lime conveying device 12.

[0030] In this embodiment, all conveying equipment includes, but is not limited to, belt conveyors, reversible belt conveyors, plate chain bucket elevators, and self-synchronizing inertial vibrating feeders. All maintenance-required parts of the conveying equipment are equipped with maintenance devices. The selection of conveying equipment should be suitable for the particle size of the material to be conveyed in this section. When using belt conveyors, heat-resistant rubber belts should be used, capable of withstanding materials with a maximum temperature of 150℃. The conveyors should be equipped with P-type and H-type cleaners, bidirectional pull-rope switches, belt misalignment monitoring, slippage monitoring, and chute anti-blockage monitoring devices. When multiple conveyors are used in a non-linear connection, the vertical projections of the conveyor centerlines should intersect at the transfer points. Dust is easily generated at material transfer points; therefore, effective dust removal equipment should be installed according to the material characteristics.

[0031] 2. The crushing section includes a crusher feed hopper 21, a crusher 22, and a crushing conveying device 23. The end of the lime conveying device 12 discharges quicklime into the crusher feed hopper 21 for temporary storage. The bottom outlet of the crusher feed hopper 21 connects to the feed inlet of the crusher 22. The crusher 22 is preferably a ring hammer crusher, jaw crusher, or impact crusher, and its internal components include motor stator windings, bearing temperature measurement, automatic lubrication, and life monitoring devices. The crusher 22 crushes the quicklime to the set particle size requirement (usually below 20mm). Excessively large particle sizes result in undigested quicklime remaining in the finished slaked lime product, creating a "raw core" and reducing the quality of the finished product. During the grinding process, excessively large particle sizes also exacerbate mill wear. The crushed material is conveyed to the screening section via the crushing conveying device 23.

[0032] 3. The screening section is a crucial step in ensuring the particle size of the raw materials. It includes a screening machine 31, an oversize conveyor 32, a medium-size conveyor 33, and an undersize conveyor 34. The screening machine 31 is a double-layer screening machine, such as a linear screen, a multi-frequency screen, or a drum screen. Its upper screen mesh size is typically 20mm, and its lower screen mesh size is typically 3mm. It is equipped with amplitude and frequency adjustment and automatic screen cleaning functions. After screening, the material is divided into: oversize material with a particle size greater than 20mm, medium-size material with a particle size between 3 and 20mm, and undersize material with a particle size less than 3mm.

[0033] The material over the screen is conveyed back to the crusher feed hopper 21 by the screen material conveying equipment 32 for further crushing, forming a closed loop.

[0034] The material in the sieve can be selectively transported to the digestion feed bin 41 of the digestion section or the grinding feed bin 51 of the grinding section according to the production instructions via the sieve material conveying equipment 33.

[0035] The screened material is directly conveyed to the quicklime finished product warehouse 61 in the finished product section via the screened material conveying equipment 34 for storage as quicklime powder product.

[0036] 4. The digestion section is the core of the quicklime digestion reaction and product purification, including the digestion feed silo 41, digestion conveying equipment 42, digester 43, semi-finished product conveying equipment 44, air classifier 45, slag conveying equipment 46, and finished product conveying equipment 47. The digestion feed silo 41 is used to store the screened material from the screening section.

[0037] The digestion and conveying equipment 42 (such as a belt conveyor) is equipped with a metering belt scale. This metering belt scale weighs the conveyed quicklime in real time and feeds the signal back to the control system, which adjusts the speed of the variable frequency motor to achieve precise and stable control of the feed rate.

[0038] Digester 43 is a multi-stage series digester, with the number of stages designed according to production capacity. Each digester is equipped with at least one manhole and two observation windows on one side, and is equipped with real-time monitoring sensors for temperature, current, water flow, and water tank level, which can realize automatic adjustment of feeding and water intake and remote start-stop control.

[0039] After the digestion reaction is completed, the semi-finished product (a mixture of quicklime and slag) is conveyed to the air classifier 45 by the semi-finished product conveying equipment 44.

[0040] The air classifier 45 is one of the key pieces of equipment in this invention. It separates light and heavy particles by controlling the internal airflow speed and utilizing centrifugal force and gravity. The heavier slag falls from the center bottom of the air classifier 45 to the slag conveying device 46; the lighter quicklime powder falls from the bottom perimeter of the air classifier 45 to the finished product conveying device 47. The air classifier 45 has an observation window on its cyclone separator for easy observation of its internal condition.

[0041] The slag conveying equipment 46 transports the separated slag to the slag silo 57 in the grinding section. The finished product conveying equipment 47 then transports the high-purity quicklime to the quicklime finished product silo 62 in the finished product section for storage. To increase output, the system can be configured with multiple digestion sections in parallel, sharing a single set of semi-finished product, slag, and finished product conveying equipment.

[0042] 5. The grinding section is used to produce fine powder products and realize the resource utilization of slag materials. It includes a grinding feed silo 51, a first grinding conveying equipment 52, a grinding mill 53, a powder collector 54, a reagent conveying equipment 55, a lime / slag powder conveying equipment 56, a slag silo 57, and a second grinding conveying equipment 58.

[0043] The grinding feed silo 51 and the slag silo 57 are preferably arranged adjacent to each other. The grinding feed silo 51 is connected to the grinding mill 53 via a first grinding conveyor 52, and the slag silo 57 is connected to the same grinding mill 53 via a second grinding conveyor 58. Both conveyors are equipped with metering devices (such as metering belt scales) that can independently adjust the conveying volume, thereby achieving precise and adjustable ratio of quicklime to slag entering the grinding mill 53.

[0044] The grinding mill 53 is preferably a vertical mill, with its air inlet height lower than its air outlet. The ground powder is carried out by the airflow under centrifugal force and enters the powder collector 54.

[0045] The dust collector 54 is equipped with fiber filter bags and is cleaned by pulse jet cleaning. The collected powder is discharged through the outlet at its bottom. The outlet of the dust collector 54 is connected to a diversion control system, which can operate the lime / slag powder conveying equipment 56 to transport ordinary mixed powder to the quicklime finished product silo 61, or operate the reagent conveying equipment 55 to transport desulfurization reagent powder that meets the proportioning requirements to the reagent finished product silo 63.

[0046] 6. The finished product section includes a quicklime finished product silo 61, a hydrated lime finished product silo 62, and a reagent finished product silo 63 arranged side by side, as well as a packaging machine 64. All finished product silos are of the same specifications and have discharge ports at the bottom. They can be metered and packaged by the packaging machine 64, or directly unloaded into tank trucks for transport. The number of hydrated lime finished product silos 62 is usually configured according to the number of parallel digestion sections; it is recommended to have at least two silos per digestion section.

[0047] Intelligent and environmentally friendly configuration: Intelligent logistics control: 3D radar level monitoring devices (not shown separately in the figure) are installed on the tops of the quicklime finished product silo 61, hydrated lime finished product silo 62, reagent finished product silo 63, digestion feed silo 41, grinding feed silo 51, and crusher feed silo 21. This monitoring system collects real-time material level data from each silo and transmits it to the central control system. The system automatically controls the destination switching of key logistics equipment such as the screen conveyor 33 and the finished product conveyor 47 according to preset logic, achieving intelligent material scheduling and balanced production on the production line.

[0048] Environmental dust control: High-efficiency dust removal equipment (such as bag filters, not shown separately in the figure) is installed at the inlet and outlet of the lime conveying equipment 12, crushing conveying equipment 23, screening machine 31, and material transfer points (chutes) of each conveying equipment, etc., to ensure a friendly production environment.

[0049] Anti-blockage guarantee: Each material supply silo and finished product silo is equipped with at least two air cannons, which are powered by compressed air and can be started and stopped intelligently based on blockage monitoring to ensure smooth material feeding.

[0050] II. Process Flow Examples The process for preparing high-quality slaked lime using the above system includes the following steps: Step 1 (Receiving and Crushing): Quicklime raw materials from external sources or quicklime obtained from kiln calcination are unloaded into quicklime feeding trough 11, then sent to crusher feeding bin 21 via lime conveying equipment 12, and then crushed to a particle size of less than 20mm by crusher 22.

[0051] Step 2 (Screening and Diversion): The crushed material is fed into the screening machine 31 via the crushing conveyor 23. The material oversize (>20mm) is returned to the crusher via the oversize conveyor 32; the material undersize (<3mm) is directly fed into the quicklime finished product silo 61 via the undersize conveyor 34; the material in the middle section (3~20mm) is automatically allocated and transported to the digestion feed silo 41 or the grinding feed silo 51 via the middle section conveyor 33 based on the material level information of each silo fed by the 3D radar material level monitoring device.

[0052] Step 3 (Digestion and Selection): The sieved material stored in the digestion feed silo 41 is quantitatively and stably fed into the digester 43 via a digestion conveyor 42 equipped with a metering belt scale, where it undergoes a thorough digestion reaction with water. The resulting product is then conveyed via a semi-finished product conveyor 44 to a classifier 45 for fine separation. The separated high-quality quicklime (calcium hydroxide content >90%, moisture ≤1%) is transported to the quicklime finished product silo 62 by the finished product conveyor 47; the separated slag is transported to the slag silo 57 by the slag conveyor 46.

[0053] Step 4 (Grinding and Co-production): The sieve material stored in the grinding feed silo 51 and the slag material stored in the slag silo 57 are respectively fed into the grinding mill 53 for grinding via the first grinding conveyor 52 and the second grinding conveyor 58 according to the required ratio. After grinding, the powder is collected by the powder collector 54 and, according to its composition, is controlled by the control system to be sent to the quicklime finished product silo 61 via the lime / slag powder conveyor 56, or to the reagent finished product silo 63 via the reagent conveyor 55, to produce desulfurization reagent powder.

[0054] Step 5 (Packaging and Shipment): The products in each finished goods warehouse are finally packaged by the bottom packaging machine 64 and then transported out by truck, or directly transported in bulk by tanker truck.

[0055] Throughout the production process, the dust removal equipment at each dust generation point operates continuously to ensure dust-free production; the intelligent control system automatically coordinates the operation of each section based on comprehensive monitoring data, realizing full-process automation, high efficiency and resource recycling.

[0056] The above description is only a part of the specific embodiments of the present invention. The scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high quality burnt lime production system integrating sieving and powder selection, characterized in that, The system comprises a receiving section, a crushing section, a screening section, a digestion section, a grinding section and a finished product section connected in sequence; The outlet of the receiving section is connected to the crusher feed bin (21) of the crushing section through a lime conveying device (12); The outlet of the crushing section is connected to the screening machine (31) of the screening section through a crushing conveying device (23); The screening section is provided with three discharge ports, which are respectively connected back to the crusher feed bin (21) through an oversize material conveying device (32), connected to the digestion feed bin (41) of the digestion section and the grinding feed bin (51) of the grinding section through a medium-sized material conveying device (33), and connected to the finished product section through an undersize material conveying device (34); The outlet of the digestion section is connected to the finished product section through a finished product conveying device (47), and simultaneously connected to the grinding section through a slag conveying device (46); The outlet of the grinding section is connected to the finished product section through a lime / slag powder conveying device (56) and a medicament conveying device (55).

2. A high quality slaked lime production system integrated with screening and powder selection according to claim 1, characterized in that, The screening machine (31) is a double-layer screening machine, the upper layer of which has a mesh size of 15-25 mm, and the lower layer has a mesh size of 2-4 mm.

3. A high quality slaked lime production system integrated with screening and powder selection according to claim 1, characterized in that, The digestion section further comprises a powder classifier (45) for separating the mixed material from the digester (43) into slaked lime and slag; the slaked lime outlet of the powder classifier (45) is connected to the finished product conveying device (47), and the slag outlet thereof is connected to the slag conveying device (46).

4. A high quality slaked lime production system integrated with screening and powder selection according to claim 3, characterized in that, The digestion section further comprises a metering belt scale arranged on the digestion conveying device (42), which is connected to a speed regulation motor signal and used for adjusting the feeding amount to the digester (43) according to the weighing feedback.

5. A high quality slaked lime production system integrated with screening and powder selection according to claim 1, characterized in that, The grinding section further comprises a slag bin (57); the system is configured to be capable of conveying the material from the grinding feed bin (51) through a first grinding conveying device (52) and the material from the slag bin (57) through a second grinding conveying device (58) to the grinding machine (53) in an adjustable proportion.

6. A high quality slaked lime production system integrated with screening and powder selection according to claim 1 or 5, characterized in that, The finished product section comprises a quicklime finished product bin (61), a slaked lime finished product bin (62) and a medicament finished product bin (63) arranged side by side; the quicklime finished product bin (61) is connected to the undersize material conveying device (34), the slaked lime finished product bin (62) is connected to the finished product conveying device (47), and the medicament finished product bin (63) is connected to the medicament conveying device (55).

7. A high quality slaked lime production system integrated with screening and powder selection according to claim 6, characterized in that, The quicklime finished product bin (61), the slaked lime finished product bin (62), the medicament finished product bin (63), the digestion feed bin (41) and the grinding feed bin (51) are all equipped with a 3D radar material level monitoring system; the conveying destination of the medium-sized material conveying device (33) is configured to be capable of automatically switching based on the signal of the 3D radar material level monitoring system.

8. A high quality slaked lime production process integrating screening and powder separation, using the high quality slaked lime production system integrating screening and powder separation according to any one of claims 1-7, characterized in that, The system comprises the following steps: S1: After the quicklime raw material is crushed in the crushing section, it is sent to the screening section for screening; S2: The oversize material obtained by screening is returned to the crushing section for re-crushing, the undersize material is sent to the finished product section for storage as quicklime product, and the medium-sized material is selectively conveyed to the digestion section or the grinding section; S3: The screened material is transported to the digestion section, and the mixture after the reaction is separated by powder selection to obtain the slaked lime product and slag; the slaked lime product is sent to the finished product section for storage, and part of the slag is transported to the grinding section; S4: The material transported to the grinding section, including the screened material from step S2 and the slag from step S3, is ground to obtain a powder product, which is sent to the finished product section for storage.

9. A process for the production of high quality slaked lime by integrating sieving and powder selection, according to claim 8, characterized in that, In step S3, the flow of the screened material transported to the digestion section is monitored and feedback controlled in real time by a metering belt scale.

10. A process for the production of high quality slaked lime by integrating sieving and powder selection as claimed in claim 8, wherein, In step S4, the feeding ratio of the quicklime material and the slag entering the grinding section is controlled by adjusting the flow recorded on the corresponding conveying equipment.

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