A cooling device for high-temperature powdered materials and a method of using the same

Abstract

The present invention discloses a cooling device for high-temperature powdered materials, including a cooling silo, a spiral cooler and a stirring barrel, wherein the feed port of the spiral cooler is connected to the discharge port of the cooling silo; the discharge port of the spiral cooler is connected to the feed port of the stirring barrel; the outer wall of the cooling silo is provided with a silo cooling water jacket, the outer wall of the spiral cooler is provided with a spiral cooling water jacket, and the interior of the spiral cooler is provided with a spiral reamer. The cooling device of the present invention can cool high-temperature powdered materials and recover waste heat for effective utilization, combines direct liquid-solid heat exchange with indirect heat exchange, has high heat exchange efficiency, low operating cost and equipment cost, stable operation, energy saving and environmental protection, strong adaptability, and is of great significance for the cooling of high-temperature powdered materials and waste heat utilization. The present invention also discloses a method for using the cooling device, which is simple to operate, low in operating cost, easy to maintain, and green and environmentally friendly.

Description

Technical Field

[0001] The invention relates to the fields of ore dressing, metallurgy and environmental protection, and in particular to a cooling device for high-temperature powdery materials and a method for using the device. Background Art

[0002] my country's ferrous metal mineral resources, such as iron ore and manganese ore, are poorly endowed, with the characteristics of "poor", "fine", "mixed" and "scattered". According to USGS statistics, the average grade of iron ore in the world is 48.82%, while the average grade of iron ore in China is only 34.29%, far below the world average; poor ore accounts for a large proportion, and more than 95% of iron ore resources need to be concentrated and enriched before they can be economically and reasonably developed and utilized, of which limonite, siderite and mixed iron ore account for about 18%. A large number of laboratory tests and production practices have shown that magnetization roasting is the only way to reasonably develop and utilize such iron ore on a large scale; my country's manganese ore resources are mainly distributed in Guangxi, Hunan, Guizhou, Yunnan, and Sichuan. Sichuan, Fujian, Shaanxi, Shanxi and other 21 provinces and regions have more than 100 million tons of resources, but the ore quality is poor and the grade is low. With the rapid development of our electrolytic manganese industry, manganese carbonate ore is becoming increasingly exhausted, and the urgency of developing and utilizing manganese oxide ore is becoming increasingly prominent. MnO2, Mn2O3 and their hydrates in manganese oxide ore have poor reaction ability with sulfuric acid, while MnO can be dissolved in sulfuric acid. If manganese oxide ore is to be used as a raw material for electrolytic manganese, it must be reduced and roasted to convert it into MnO and then dissolved in sulfuric acid to generate MnSO4. With the steady advancement of high-temperature pretreatment technology for ferrous metals in my country, the cooling and waste heat utilization technology and equipment of roasted products have gradually become a bottleneck problem restricting its development, which urgently needs to be solved.

[0003] At present, water cooling and air cooling are mainly used to cool high-temperature powdered materials at home and abroad. The water cooling method is to discharge the high-temperature powdered materials directly into the water, and cool the materials to the temperature required by the subsequent processing process through heat exchange with a large amount of water. However, water cooling cannot recover a large amount of sensible heat carried by the roasting products, which is not conducive to energy saving and consumption reduction in the high-temperature pretreatment process; on the other hand, a large amount of dust-containing water vapor generated during the water cooling process may cause the materials to suspend, which is easy to cause material flow blockage; more seriously, the high-temperature powdered materials directly enter the water, and the materials are prone to splashing during the rapid cooling process, which poses a safety hazard. The air cooling method is to exchange heat with the high-temperature materials through a large amount of cooling airflow to cool the high-temperature materials to the temperature required by the subsequent processing process. However, the specific heat capacity of the gas is generally small. In order to cool the high-temperature materials, a large amount of cooling gas must be consumed. On the one hand, due to the large cooling area, the cooling operation infrastructure and operating costs are high; on the other hand, the dust-containing flue gas after the heat exchange must be dust-removed before it can be discharged into the air, which poses a risk of environmental pollution; more importantly, the cooling of a large amount of high-temperature roasting materials must be carried out in a specific atmosphere. The use of air-cooled roasting materials may cause secondary mineral phase transformation, affecting product quality.

[0004] Therefore, developing a system for cooling and utilizing waste heat of high-temperature powdered materials with low infrastructure investment and operating costs, stable operation, energy saving and environmental protection, and strong adaptability, as well as a method for cooling and utilizing waste heat of high-temperature powdered materials has always been the goal pursued by technical personnel in this field. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology and provide a cooling device for high-temperature powdered materials with low infrastructure investment and operating costs, stable operation, energy saving and environmental protection, and strong adaptability, as well as a method for using the device.

[0006] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0007] A cooling device for high-temperature powdered materials comprises a cooling silo, a spiral cooler and a stirring barrel, wherein the feed port of the spiral cooler is connected to the discharge port at the bottom of the cooling silo; the discharge port of the spiral cooler is connected to the feed port of the stirring barrel; the outer wall of the cooling silo is provided with a silo cooling water jacket, the outer wall of the spiral cooler is provided with a spiral cooling water jacket, and the interior of the spiral cooler is provided with a spiral reamer.

[0008] In the above-mentioned cooling device, preferably, the silo cooling water jacket is provided with a silo cooling water inlet and a silo cooling water outlet, the silo cooling water inlet is connected to an external high-level water tank through a pipeline, and the silo cooling water outlet is connected to an external waste heat utilization system through a pipeline, which can realize the recovery of waste heat for effective utilization; heat exchange pipes are provided inside the cooling silo, and the heat exchange efficiency is higher after the heat exchange pipes are added.

[0009] One preferred solution of the heat exchange tube is that the heat exchange tube passes through the cooling silo and is connected to the inner cavity of the silo cooling water jacket. This solution generates hot water but does not generate water vapor, and is suitable for cooling high-temperature powder materials with less heat at 100℃ to 500℃ or high-temperature powder materials with more heat at 500℃, and the waste heat utilization method is concentrated.

[0010] Another preferred solution is that the heat exchange tube passes through the cooling silo and the silo cooling water jacket, and the outer wall of the silo cooling water jacket is provided with a heat exchange tube cooling water inlet and a heat exchange tube water vapor outlet, the heat exchange tube cooling water inlet is connected to the external high-level water pool through a pipeline, and the heat exchange tube water vapor outlet is connected to the external water vapor utilization system through a pipeline. This solution produces hot water and water vapor, and the waste heat utilization method is more diversified, which is more suitable for the cooling of high-temperature powdered materials above 500°C that carry high heat or still undergo chemical reactions during the cooling process to release a large amount of heat.

[0011] Preferably, the cooling silo is installed below the discharge port of the high-temperature powdered material pretreatment device, and the feed port of the cooling silo is connected to the discharge port of the high-temperature powdered material pretreatment device.

[0012] Preferably, the spiral cooler is installed below the cooling silo, and a spiral cooling water inlet and a spiral cooling water outlet are provided on the outer wall of the spiral cooling water jacket. The spiral cooling water inlet is connected to an external high-level water tank through a pipe, and the spiral cooling water outlet is connected to an external waste heat utilization system through a pipe, so that waste heat can be recovered for effective utilization.

[0013] Preferably, a jet ejector nozzle and a plurality of cooling water nozzles are provided near the feed port of the mixing barrel, the jet ejector nozzle is connected to an external pump through a pipeline, and the plurality of cooling water nozzles are connected to an external high-level water pool through a pipeline. The jet ejector nozzle near the feed port of the mixing barrel ensures that the high-temperature powdered material can smoothly enter the mixing barrel from the spiral cooler, and the mixing barrel is provided with a plurality of cooling water nozzles, ensuring that the temperature of the powdered material reaches the temperature required for the subsequent processing steps after cooling. The mixing barrel is connected to the processing step after the high-temperature powdered material is cooled through the cooling slurry outlet.

[0014] Preferably, a chimney is provided on the top of the mixing barrel, and a chimney cooling water nozzle is provided on the chimney, and the chimney cooling water nozzle is connected to an external high-level water pool through a pipeline. A cooling water nozzle is arranged inside the chimney, which reduces the gas pressure in the mixing barrel while ensuring that the exhaust gas meets environmental protection requirements.

[0015] Based on a general inventive concept, the present invention also provides a method for using a cooling device, comprising the following steps:

[0016] (1) The high-temperature powdered material enters the cooling silo under the action of gravity, and the high-temperature powdered material exchanges heat with the cooling water in the cooling water jacket during the falling process;

[0017] (2) allowing the high-temperature powdered material that has been preliminarily cooled in step (1) to enter the spiral cooler from the cooling silo under the action of gravity, so that the high-temperature powdered material is turned and pushed by the spiral reamer to exchange heat with the cooling water in the spiral cooling water jacket, and the temperature of the high-temperature powdered material is further reduced, and is pushed out of the spiral cooler under the action of the spiral reamer;

[0018] (3) The high-temperature powdered material further cooled after step (2) enters the mixing barrel under the cooling water of the mixing barrel, and the temperature of the high-temperature powdered material is further reduced under the action of the cooling water, and flows out of the mixing barrel after reaching the temperature required for subsequent processing.

[0019] Preferably, in step (1), the high-temperature powdered material exchanges heat with the cooling water in the heat exchange tube and the cooling water jacket during the falling process, and the hot water and / or water vapor obtained by the heat exchange is connected to an external waste heat utilization system through a pipeline for waste heat utilization; in step (2), the hot water obtained by the heat exchange is connected to an external waste heat utilization system through a pipeline for waste heat utilization; in step (3), after the temperature of the high-temperature powdered material reaches the temperature requirement for subsequent operation processing, it flows out from the cooling slurry outlet of the stirring barrel, and the dust-containing flue gas generated in this process is collected in the chimney of the stirring barrel to ensure that the dust content meets the standard before being discharged into the air.

[0020] The technical solution of the present invention can not only effectively cool high-temperature powdered materials, but also has two waste heat utilization product production solutions, hot water and hot water + water vapor, according to the different cooling starting temperatures of the high-temperature materials, which can economically and reasonably utilize the large amount of sensible heat carried by the high-temperature powdered materials.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] 1. The cooling device of the present invention can effectively cool high-temperature powdered materials and recover waste heat for effective utilization, combines liquid-solid direct heat exchange with indirect heat exchange, has high heat exchange efficiency, low operating cost and equipment cost, stable operation, energy saving and environmental protection, strong adaptability, and is of great significance for the cooling of high-temperature powdered materials and the utilization of waste heat.

[0023] 2. The cooling device of the present invention can adopt two waste heat utilization schemes, hot water and hot water + steam, according to the different cooling starting temperatures of high-temperature materials, and can economically and reasonably utilize the large amount of sensible heat carried by high-temperature powdered materials.

[0024] 3. The cooling device of the present invention makes full use of gravity, has relatively few moving parts in the system, has low system infrastructure investment, stable operation and low operating cost, and can reasonably control the cooling time of the material by adjusting the speed of the spiral cooler, thereby ensuring the cooling effect.

[0025] 4. The cooling device of the present invention is provided with a spray ejector in the mixing barrel. The spray ejector ensures that the powdered material forcibly conveyed by the spiral cooler can smoothly enter the mixing barrel, thereby ensuring that the entire cooling and waste heat utilization system can operate continuously and stably. A chimney is also fixedly provided on the top of the mixing barrel. Under the premise of reducing the gas pressure in the mixing barrel to ensure the smooth flow of materials, the exhaust gas will not cause environmental pollution, thereby ensuring that the operation process of the system is green and environmentally friendly.

[0026] 5. The method of use of the present invention is simple to operate, has low operating cost, is easy to maintain, and is green and environmentally friendly during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the cooling device in Example 1 of the present invention.

[0029] Figure 2 It is a schematic diagram of the cooling device in Example 2 of the present invention.

[0030] 1. Cooling silo, 1-1. Silo cooling water outlet, 1-2. Silo cooling water jacket, 1-3. Heat exchange tube, 1-4. Silo cooling water inlet 1, 1-5. Heat exchange tube cooling water inlet, 1-6. Heat exchange tube water vapor outlet; 2. Spiral cooler, 2-1. Spiral reamer, 2-2 Spiral cooling water inlet, 2-3. Spiral cooling water outlet, 2-4. Spiral cooling water jacket; 3. Mixing barrel, 3-1. Chimney, 3-2. Chimney cooling water nozzle, 3-3. Cooling water nozzle, 3-4. Ejector nozzle, 3-5. Cooling water nozzle, 3-6. Cooling slurry outlet. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and meticulously below in conjunction with the accompanying drawings and preferred embodiments of the present invention, but the protection scope of the present invention is not limited to the following specific embodiments.

[0032] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0033] Unless otherwise specified, various raw materials, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0034] Embodiment 1:

[0035] A cooling device for high temperature powdery materials, such as Figure 1As shown, it includes a cooling silo 1, a spiral cooler 2 and a stirring barrel 3 and attached connecting pipes and valves, etc. The cooling silo 1 of this embodiment is installed directly below the material flow outlet of the powder ore high temperature pretreatment device, and is connected to the material flow outlet of the powder ore high temperature pretreatment device through a high temperature resistant pipe. The discharge port of the cooling silo 1 is connected to the feed port of the spiral cooler 2 through a high temperature resistant pipe, and the discharge port of the spiral cooler 2 is connected to the feed port of the stirring barrel 3. The cooling slurry outlets 3-6 of the stirring barrel 3 are connected to subsequent processing steps through pipes.

[0036] The outer wall of the cooling silo 1 of this embodiment is provided with a silo cooling water jacket 1-2, and the silo cooling water jacket 1-2 is provided with a silo cooling water inlet 1-4 and a silo cooling water outlet 1-1, and the silo cooling water inlet 1-4 is connected to an external high-level water pool through a pipeline, and the silo cooling water outlet 1-1 is connected to an external waste heat utilization system through a high-temperature resistant pipeline. A heat exchange tube 1-3 is provided in the cooling silo 1, and the heat exchange tube 1-3 passes through the cooling silo 1 and the silo cooling water jacket 1-2, and a heat exchange tube cooling water inlet 1-5 and a heat exchange tube water vapor outlet 1-6 are provided on the outer wall of the silo cooling water jacket 1-2, and the heat exchange tube cooling water inlet 1-5 is connected to an external high-level water pool through a pipeline, and the heat exchange tube water vapor outlet 1-6 is connected to an external water vapor utilization system through a high-temperature resistant pipeline.

[0037] The spiral cooler 2 of this embodiment is fixedly arranged under the cooling silo 1, and the feed port of the spiral cooler 2 is connected to the discharge port of the cooling silo 1 through a high temperature resistant pipe, and a spiral reamer 2-1 is arranged inside the spiral cooler 2. The outer wall of the spiral cooler 2 is provided with a spiral cooling water jacket 2-4, and the outer wall of the spiral cooling water jacket 2-4 is provided with a spiral cooling water inlet 2-2 and a spiral cooling water outlet 2-3, the spiral cooling water inlet 2-2 is connected to an external high-level water pool through a pipe, and the spiral cooling water outlet 2-3 is connected to an external waste heat utilization system through a high temperature resistant pipe.

[0038] In the present embodiment, a jet ejector nozzle 3-4 and a plurality of cooling water nozzles 3-3, 3-5 are fixedly provided near the feed port of the mixing barrel 3. The plurality of cooling water nozzles 3-3, 3-5 are distributed in opposite directions in the mixing barrel 3. The jet ejector nozzle 3-4 is connected to an external pump through a pipeline, and the plurality of cooling water nozzles 3-4, 3-5 are connected to an external high-level water pool through a pipeline. A chimney 3-1 is installed on the top of the mixing barrel 3, and a chimney cooling water nozzle 3-2 is fixedly provided on the outer wall of the chimney 3-1, and the chimney cooling water nozzle 3-2 is connected to an external high-level water pool through a pipeline.

[0039] The method for using the cooling device of this embodiment comprises the following steps:

[0040] (1) Cooling water enters from the cooling water inlet 1-4 of the silo so that the cooling water fills the cooling water jacket 1-2 of the silo, and at the same time, cooling water enters from the cooling water inlet 1-5 of the heat exchange tube so that the cooling water fills the heat exchange tube 1-3, and then the high-temperature powder material enters the cooling silo 1 from the material flow outlet of the powder ore high-temperature pretreatment device under the action of gravity. During the falling process, the high-temperature powder material exchanges heat with the cooling water in the heat exchange tube 1-3 and the silo cooling water jacket 1-2, and the obtained hot water and water vapor are connected to the external waste heat utilization system through the pipeline of the silo cooling water outlet 1-1 and the heat exchange tube water vapor outlet 1-6 for waste heat utilization;

[0041] (2) Cooling water is introduced from the spiral cooling water inlet 2-2 to fill the spiral cooling water jacket 2-4, so that the high-temperature powdered material preliminarily cooled after step (1) enters the spiral cooler 2 from the cooling silo 1 under the action of gravity, and the spiral cooler 2 is started, so that the high-temperature powdered material is turned and pushed by the spiral reamer 2-1, and the heat exchange is carried out with the cooling water in the spiral cooling water jacket 2-4. The obtained hot water is connected to the external waste heat utilization system through the pipeline of the spiral cooling water outlet 2-3 for waste heat utilization. At the same time, the temperature of the high-temperature powdered material is further reduced, and the material is pushed out of the spiral cooler 2 under the action of the spiral reamer 2-1;

[0042] (3) Cooling water is allowed to flow into the mixing barrel 3 from the ejector nozzle 3-4 and the plurality of cooling water nozzles 3-3 and 3-5, and then the high-temperature powdered material further cooled after step (2) is drained into the mixing barrel 3 by the cooling water from the ejector nozzle 3-4 and the plurality of cooling water nozzles 3-3 and 3-5, and is stirred in the mixing barrel. The temperature of the high-temperature powdered material is further reduced under the action of the cooling water and stirring, and after reaching the temperature requirement for subsequent operation, it flows out from the cooling slurry outlet 3-6 of the mixing barrel 3. The dusty flue gas generated in this process is collected in the chimney 3-1, and the cooling water nozzle 3-2 provided in the chimney can flow in cooling water, so that the gas pressure in the mixing barrel is reduced while ensuring that the exhaust gas meets the environmental protection requirements, and then the exhaust gas that meets the standards is discharged into the air.

[0043] The high-temperature powdered material to be cooled in this embodiment is a roasted ore after reduction roasting of manganese oxide ore, and the original temperature of the roasted ore is 750℃~800℃. After cooling in the cooling bin 1, the temperature of the roasted ore is reduced to 400℃~450℃, and a water vapor byproduct with a temperature of ≥120℃ and hot water with a temperature of 90℃~95℃ are obtained; the roasted ore is further cooled in the spiral cooler 2, and the temperature is reduced to 150℃~200℃, and hot water with a temperature of 80℃~90℃ is obtained; the roasted ore finally enters the mixing barrel 3 to further cool to a slurry of 80℃~90℃, and enters the subsequent leaching operation after slurry adjustment, completing the cooling process of the entire high-temperature powder ore.

[0044] Embodiment 2:

[0045] A cooling device for high temperature powdery materials, such as Figure 1 As shown, it includes a cooling silo 1, a spiral cooler 2 and a stirring barrel 3 and attached connecting pipes and valves, etc. The cooling silo 1 of this embodiment is installed directly below the material flow outlet of the powder ore high temperature pretreatment device, and is connected to the material flow outlet of the powder ore high temperature pretreatment device through a high temperature resistant pipe. The discharge port of the cooling silo 1 is connected to the feed port of the spiral cooler 2 through a high temperature resistant pipe, and the discharge port of the spiral cooler 2 is connected to the feed port of the stirring barrel 3. The cooling slurry outlets 3-6 of the stirring barrel 3 are connected to subsequent processing steps through pipes.

[0046] The outer wall of the cooling silo 1 of this embodiment is provided with a silo cooling water jacket 1-2, and the silo cooling water jacket 1-2 is provided with a silo cooling water inlet 1-4 and a silo cooling water outlet 1-1, and the silo cooling water inlet 1-4 is connected to an external high-level water pool through a pipeline, and the silo cooling water outlet 1-1 is connected to an external waste heat utilization system through a high-temperature resistant pipeline. A heat exchange pipe 1-3 is provided in the cooling silo, and the heat exchange pipe 1-3 passes through the cooling silo 1 and is connected to the inner cavity of the silo cooling water jacket 1-2. The heat generated by the heat exchange of the heat exchange pipe 1-3 is transferred through the water in the silo cooling water jacket 1-2.

[0047] The spiral cooler 2 of this embodiment is fixedly arranged under the cooling silo 1, and the feed port of the spiral cooler 2 is connected to the discharge port of the cooling silo 1 through a high temperature resistant pipe, and a spiral reamer 2-1 is arranged inside the spiral cooler 2. The outer wall of the spiral cooler 2 is provided with a spiral cooling water jacket 2-4, and the outer wall of the spiral cooling water jacket 2-4 is provided with a spiral cooling water inlet 2-2 and a spiral cooling water outlet 2-3, the spiral cooling water inlet 2-2 is connected to an external high-level water pool through a pipe, and the spiral cooling water outlet 2-3 is connected to an external waste heat utilization system through a high temperature resistant pipe.

[0048] In the present embodiment, a jet ejector nozzle 3-4 and a plurality of cooling water nozzles 3-4, 3-5 are fixedly provided near the feed port of the mixing barrel 3. The plurality of cooling water nozzles 3-4, 3-5 are distributed in the mixing barrel 3 in opposite directions up and down. The jet ejector nozzle 3-4 is connected to an external pump through a pipeline, and the plurality of cooling water nozzles 3-4, 3-5 are connected to an external high-level water pool through a pipeline. A chimney 3-1 is installed on the top of the mixing barrel 3, and a chimney cooling water nozzle 3-2 is fixedly provided on the outer wall of the chimney 3-1, and the chimney cooling water nozzle 3-2 is connected to an external high-level water pool through a pipeline.

[0049] The method for using the cooling device of this embodiment comprises the following steps:

[0050] (1) Cooling water enters from the silo cooling water inlet 1-4 so that the cooling water fills the silo cooling water jacket 1-2 and the heat exchange tube 1-3, and then the high-temperature powder material enters the cooling silo 1 from the material flow outlet of the powder ore high-temperature pretreatment device under the action of gravity. The high-temperature powder material exchanges heat with the heat exchange tube 1-3 and the cooling water in the silo cooling water jacket 1-2 during the falling process, and the obtained hot water is connected to the external waste heat utilization system through the pipeline of the silo cooling water outlet 1-1 for waste heat utilization;

[0051] (2) Cooling water is introduced from the spiral cooling water inlet 2-2 to fill the spiral cooling water jacket 2-4, so that the high-temperature powdered material preliminarily cooled after step (1) enters the spiral cooler 2 from the cooling silo 1 under the action of gravity, and the spiral cooler 2 is started, so that the high-temperature powdered material is turned and pushed by the spiral reamer 2-1, and the heat exchange is carried out with the cooling water in the spiral cooling water jacket 2-4. The obtained hot water is connected to the external waste heat utilization system through the pipeline of the spiral cooling water outlet 2-3 for waste heat utilization. At the same time, the temperature of the high-temperature powdered material is further reduced, and the material is pushed out of the spiral cooler 2 under the action of the spiral reamer 2-1;

[0052] (3) Cooling water is allowed to flow into the mixing barrel 3 from the ejector nozzle 3-4 and the plurality of cooling water nozzles 3-3 and 3-5, and then the high-temperature powdered material further cooled after step (2) is drained into the mixing barrel 3 by the cooling water from the ejector nozzle 3-4 and the plurality of cooling water nozzles 3-3 and 3-5, and is stirred in the mixing barrel. The temperature of the high-temperature powdered material is further reduced under the action of the cooling water and stirring, and after reaching the temperature requirement for subsequent operation, it flows out from the cooling slurry outlet 3-6 of the mixing barrel 3. The dusty flue gas generated in this process is collected in the chimney 3-1, and the cooling water nozzle 3-2 provided in the chimney can flow in cooling water, so that the gas pressure in the mixing barrel is reduced while ensuring that the exhaust gas meets the environmental protection requirements, and then the exhaust gas that meets the standards is discharged into the air.

[0053] The material to be cooled in this embodiment is a high-temperature roasted ore obtained by flash magnetization roasting of a certain gold smelting waste slag, and its particle size composition is shown in Table 1.

[0054] Table 1: Roasted ore particle size screening and metal content distribution results of each particle size / %

[0055]

[0056] From the particle size screening results of the roasted ore in Table 1, it can be seen that the -0.075mm content of the roasted ore accounts for 82.85%, and -0.019mm accounts for 48.77%, which is a fine-grained powder that is difficult to recover. After flash magnetization roasting, the temperature of the roasted ore is 700℃~750℃. When the high-temperature powder material cooling and waste heat utilization method provided by the present invention is used for treatment, after cooling in the cooling silo 1, the temperature of the roasted ore drops to 300℃~350℃, and 80℃~90℃ hot water is obtained for daily water use in the roasting plant; then it enters the spiral cooler 2 for cooling, and the temperature of the roasted ore is further reduced to 80℃~100℃; finally, it enters the stirring barrel 3 under the injection of the ejector and is further cooled to 30℃~40℃ and slurry is adjusted, and then enters the subsequent multiple weak magnetic separation processes to complete the cooling process of the high-temperature powder material.

[0057] In general, the cooling device of the present invention can effectively cool high-temperature powdered materials and recover waste heat for effective utilization, combines direct liquid-solid heat exchange with indirect heat exchange, has high heat exchange efficiency, low operating cost and equipment cost, stable operation, energy saving and environmental protection, strong adaptability, and is of great significance for the cooling of high-temperature powdered materials and waste heat utilization. The use method of the device is simple to operate, has low operating cost, is easy to maintain, and is green and environmentally friendly during use.

Claims

1. A cooling device for high-temperature powdery materials, characterized in that: It comprises a cooling silo (1), a spiral cooler (2) and a stirring barrel (3), wherein the feed port of the spiral cooler (2) is connected to the discharge port at the bottom of the cooling silo (1); the discharge port of the spiral cooler (2) is connected to the feed port of the stirring barrel (3); the outer wall of the cooling silo (1) is provided with a silo cooling water jacket (1-2), the outer wall of the spiral cooler (2) is provided with a spiral cooling water jacket (2-4), and the interior of the spiral cooler (2) is provided with a spiral reamer (2-1); The silo cooling water jacket (1-2) is provided with a silo cooling water inlet (1-4) and a silo cooling water outlet (1-1), the silo cooling water inlet (1-4) is connected to an external water pool via a pipeline, and the silo cooling water outlet (1-1) is connected to an external waste heat utilization system via a pipeline; a heat exchange pipe (1-3) is provided inside the cooling silo (1); A spiral cooling water inlet (2-2) and a spiral cooling water outlet (2-3) are provided on the outer wall of the spiral cooling water jacket (2-4); the spiral cooling water inlet (2-2) is connected to an external water pool via a pipeline, and the spiral cooling water outlet (2-3) is connected to an external waste heat utilization system via a pipeline; A jet ejector nozzle (3-4) and a plurality of cooling water ejectors (3-3, 3-5) are provided near the feed port of the mixing barrel (3); the jet ejector nozzle (3-4) is connected to an external pump via a pipeline, and the plurality of cooling water ejectors (3-3, 3-5) are connected to an external water pool via pipelines; a chimney (3-1) is provided on the top of the mixing barrel (3), and a chimney cooling water ejector nozzle (3-2) is provided on the chimney (3-1).

2. The cooling device according to claim 1, characterized in that: The heat exchange tube (1-3) passes through the cooling silo (1) and is connected to the inner cavity of the silo cooling water jacket (1-2).

3. The cooling device according to claim 1, characterized in that: The heat exchange tube (1-3) passes through the cooling silo (1) and the silo cooling water jacket (1-2); a heat exchange tube cooling water inlet (1-5) and a heat exchange tube water vapor outlet (1-6) are provided on the outer wall of the silo cooling water jacket (1-2); the heat exchange tube cooling water inlet (1-5) is connected to an external water pool via a pipeline, and the heat exchange tube water vapor outlet (1-6) is connected to an external water vapor utilization system via a pipeline.

4. The cooling device according to claim 1, characterized in that: The cooling silo (1) is installed below the discharge port of the high-temperature powdery material pretreatment device, and the feed port of the cooling silo (1) is connected to the discharge port of the high-temperature powdery material pretreatment device.

5. The cooling device according to claim 1, characterized in that: The spiral cooler (2) is installed below the cooling silo (1).

6. The cooling device according to any one of claims 1 to 5, characterized in that: The stirring barrel (3) is connected to the processing step after the high-temperature powdery material is cooled via the cooling slurry outlet (3-6).

7. The cooling device according to any one of claims 1 to 5, characterized in that: The chimney cooling water nozzle (3-2) is connected to an external water pool through a pipeline.

8. A method for using the cooling device according to any one of claims 1 to 7, comprising the following steps: (1) allowing high-temperature powdered materials to enter the cooling silo (1) under the action of gravity, and the high-temperature powdered materials undergo heat exchange with the heat exchange tubes (1-3) and the cooling water in the silo cooling water jacket (1-2) during the falling process, and the hot water and / or water vapor obtained through the heat exchange is connected to an external waste heat utilization system through a pipeline for waste heat utilization; (2) the high-temperature powdery material that has been preliminarily cooled after the step (1) is allowed to enter the spiral cooler (2) from the cooling silo (1) under the action of gravity, and the high-temperature powdery material is turned and pushed by the spiral reamer (2-1) to exchange heat with the cooling water in the spiral cooling water jacket (2-4), and the temperature of the high-temperature powdery material is further reduced. The high-temperature powdery material is pushed out of the spiral cooler (2) under the action of the spiral reamer (2-1), and the hot water obtained through the heat exchange is connected to an external waste heat utilization system through a pipeline for waste heat utilization; (3) The high-temperature powdered material that has been further cooled after the step (2) enters the mixing barrel (3) under the drainage of the cooling water of the mixing barrel (3). The temperature of the high-temperature powdered material is further reduced under the action of the cooling water, and flows out of the mixing barrel (3) after reaching the temperature requirement for subsequent operation. The dust-containing flue gas generated in this process is collected in the chimney (3-1) of the mixing barrel (3) to ensure that the dust content meets the standard before being discharged into the air.

9. The method of use according to claim 8, characterized in that: In the step (3), the high-temperature powdered material flows out from the cooling slurry outlet (3-6) of the stirring barrel (3) after the temperature of the high-temperature powdered material reaches the temperature requirement for subsequent processing.

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