A dry beneficiation production system

Abstract

This utility model relates to the field of mineral processing technology, and more particularly to a dry mineral processing production system. The system includes: a calcination device, a wet grinding device, a leaching device, a first filter press device, and a re-slurry device. The output of the calcination device is connected to the input of the wet grinding device for calcining the ore. The output of the wet grinding device is connected to the input of the leaching device for crushing the calcined ore. The output of the leaching device is connected to the input of the first filter press device for acid leaching the wet-ground slurry. The output of the first filter press device is connected to the input of the re-slurry device for solid-liquid separation of the leached slurry. The re-slurry device is used to clean the substandard ore after filter press. These interconnected components provide reliable technical support for dry mineral processing production, helping to improve both efficiency and quality.

Description

Technical Field

[0001] This utility model relates to the field of mineral processing technology, and in particular to a dry mineral processing production system. Background Technology

[0002] In traditional phosphate rock beneficiation processes, dry beneficiation production systems play a crucial role. In the field of phosphate rock processing, traditional mining procedures often lead to the waste of large amounts of low-quality phosphate rock resources. Directly utilizing untreated raw ore often results in subsequent production processes and reduced efficiency in the utilization of fossil resources due to the ore's hardness and the presence of certain impurities. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, this utility model provides a dry mineral processing production system that improves the recovery rate and utilization efficiency of phosphate rock resources.

[0004] This utility model proposes a dry mineral processing system, the system comprising:

[0005] Calcination unit, wet grinding unit, leaching unit, first filter press unit, and re-slurry unit;

[0006] The output end of the calcining device is connected to the input end of the wet grinding device, and is used to calcine the ore.

[0007] The output end of the wet grinding device is connected to the input end of the leaching device, and is used to crush the calcined ore.

[0008] The output end of the leaching device is connected to the input end of the first pressure filter device, and is used to perform acid leaching treatment on the wet-milled slurry.

[0009] The output end of the first filter press is connected to the input end of the repulping device, and is used to perform solid-liquid separation on the leached slurry.

[0010] The re-slurry device is used to clean substandard ore after pressure filtration.

[0011] In an optional embodiment, the system further includes a second filter press, the output of which is connected to the input of the second filter press, for solid-liquid separation of the re-slurryed ore.

[0012] In an optional embodiment, the output ends of both the first and second filter press devices are connected to a filtrate recovery device.

[0013] In an optional embodiment, the system further includes water storage tanks, all of which are connected to the wet grinding device, the immersion device, and the re-pulping device.

[0014] In one optional embodiment, the calcining apparatus includes a preheater, a rotary calcining kiln, a Roots blower, a pulverized coal burner, and a rotary cooler, wherein the pulverized coal burner is disposed in the rotary calcining kiln.

[0015] In one optional embodiment, the calcination temperature of the calcination apparatus is 950°C to 1150°C, and the calcination time is 1 hour to 1.5 hours.

[0016] In an optional embodiment, the leaching device is equipped with a stirring device and a pH adjustment device.

[0017] In one optional embodiment, the leaching solution of the leaching device is a nitric acid solution with a mass percentage concentration of 75%, and the leaching time is 3 to 4.5 hours.

[0018] In an optional embodiment, the system further includes a crushing device, the output of which is connected to the input of the calcining device, for crushing the ore before calcination.

[0019] In an optional embodiment, the system further includes terminal control devices, all of which are connected to the calcination device, the wet grinding device, the leaching device, the first filter press device, the re-slurry device, the second filter press device, the water storage tank, and the pulverizing device.

[0020] The dry mineral processing system proposed in this utility model has at least one of the following technical advantages:

[0021] 1. The ore is subjected to high-temperature treatment by a calcination device, which alters the physicochemical properties of phosphate minerals and gangue minerals and improves the dissociability of phosphate minerals. Subsequently, the calcined ore is crushed to a suitable particle size by a wet grinding device, providing favorable conditions for subsequent leaching, significantly improving the recovery rate of low-quality phosphate ore and reducing resource waste.

[0022] 2. The calcination device reduces the hardness of the ore by high-temperature treatment, thus reducing equipment wear during the wet grinding process. The wet grinding device uses high-efficiency crushing technology to crush the ore into micron-sized particles, ensuring full dissociation of phosphate minerals and significantly improving subsequent leaching efficiency.

[0023] 3. Acid leaching is performed using an leaching device, which selectively dissolves phosphate minerals with an acidic solution. At the same time, solid-liquid separation is achieved through a pressure filter device, which effectively removes impurities and significantly improves the grade and purity of the phosphate concentrate.

[0024] 4. The substandard ore is cleaned by the reslurry unit to further remove residual impurities and improve the purity of the ore. In addition, the reslurry cleaning can allow the substandard ore to re-enter the processing flow, increasing the chance of the ore being fully utilized and further improving resource utilization efficiency. Moreover, the reslurry ore can be directly sent to the filter press for solid-liquid separation without the need for water washing during the filter press. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a dry mineral processing production system shown in an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of a second structure of a dry mineral processing production system shown in an embodiment of this application;

[0027] Figure 3 This is a connection diagram of a water storage tank shown in an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the third structure of a dry mineral processing production system shown in an embodiment of this application.

[0029] Explanation of reference numerals in the attached figures

[0030] 10. Crushing device; 20. Calcination device; 30. Wet grinding device; 40. Leaching device; 50. First filter press device; 60. Re-slurry device; 70. Second filter press device; 80. Water storage tank; 90. Terminal control device. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0033] Reference Figure 1The diagram shown is a structural schematic of a dry mineral processing system according to an embodiment of this application. The dry mineral processing system includes a crushing device 10, a calcining device 20, a wet grinding device 30, a leaching device 40, a first filter press 50, and a re-slurry device 60. The crushing device 10, the calcining device 20, the wet grinding device 30, the leaching device 40, the first filter press 50, and the re-slurry device 60 are connected sequentially.

[0034] After the raw ore is extracted from the mine, it is directly transported to the dry beneficiation production system for screening. In order to understand the inventive concept of this utility model, in the embodiments of this application, the ore extracted from the mine is illustrated by taking raw phosphate rock (0mm to 350mm, water content ≤5%) as an example.

[0035] In some embodiments, the crushing device 10 may include an inertial vibrating feeder, a jaw crusher, and a high-frequency vibrating screen. After exiting the mine, the raw phosphate ore can be fed into the inertial vibrating feeder via a loader. After vibration, it enters the jaw crusher, which has a crushing capacity of 30 to 50 tons per hour. The jaw crusher crushes the raw phosphate ore (≤350mm) to ≤60mm, and then transports it to the high-frequency vibrating screen for screening via a conveyor (e.g., a belt conveyor). After screening, the phosphate ore is conveyed by a conveyor (e.g., a belt conveyor) and weighed before being fed into a bucket elevator. The bucket elevator then transports the phosphate ore to a phosphate ore powder silo for storage and further processing. When the raw phosphate ore requires further processing after crushing, it can be directly fed into a calcination device via a bucket elevator for high-temperature calcination.

[0036] In some embodiments, the calcination apparatus 20 may include a preheater, a rotary calcining kiln, a Roots blower, a pulverized coal burner, and a rotary cooler, wherein the pulverized coal burner is disposed in the rotary calcining kiln. Specifically, the pulverized phosphate rock enters the preheater and is heated by calcination tail gas, then enters the tail of the rotary calcining kiln. As the rotary calcining kiln rotates towards the head, the organic matter, dolomite, and calcite in the phosphate rock are gradually heated and decomposed by the high-temperature furnace gas. The pulverized coal is conveyed by the Roots blower to the fully automatic pulverized coal burner, and then air is sent into the pulverized coal burner by the primary Roots blower. The combustion of pulverized coal is controlled by adjusting the amount of central air, internal air, and external air. The calcined phosphate rock is discharged from the kiln head of the rotary calcining kiln, then cooled with air in the rotary cooler before being discharged, and finally sent to the clinker silo by the clinker bucket elevator for further processing.

[0037] It should be noted that the calcination temperature in the rotary kiln needs to reach 950℃ to 1150℃, and the calcination time should be maintained for 1 hour to 1.5 hours.

[0038] After calcination, when further processing is required, the calcined phosphate ore (referred to as calcined ore) is directly weighed by a screw weigher via a clinker bucket elevator and fed into a scraper conveyor to be transported to the wet grinding device 30. In some embodiments, the wet grinding device 30 may include a phosphate ore ball mill and a wet grinding mill. Specifically, the phosphate ore is fed to the phosphate ore ball mill via a scraper conveyor, and the filter cake wash water is pumped to the wet grinding mill inlet via an underground tank (i.e., the first water storage tank) as makeup water for the wet grinding mill. The calcined ore enters the ball mill together with the calcined ore, and is ground into a slurry by the steel balls, which flows into the slurry tank.

[0039] When wet milling is complete and further processing is required, the phosphate slurry in the slurry tank is transported to the leaching device 40 at a preset flow rate. In some embodiments, the leaching device 40 is equipped with a stirring device and a pH adjustment device. The leaching solution in the leaching device 40 is a nitric acid solution with a mass percentage concentration of 75%. The nitric acid is diluted to dilute nitric acid by adding water at a 1:1 ratio in a second water storage tank. The dilute nitric acid is then pumped to the leaching device 40 via an acid mixing tank pump in the second water storage tank for acid addition and fine-tuning at room temperature for reaction (acid leaching). The slurry overflows into the leaching device 40 sequentially for thorough acid leaching. To ensure a complete acid leaching reaction, the stirring device continuously agitates the leaching process, maintaining the leaching time at 3 to 4.5 hours. The pH value of the leaching solution is monitored and kept consistent during the leaching process using the pH adjustment device. After acid leaching, the slurry enters the first filter press 50 for solid-liquid separation.

[0040] Refer to together Figure 2In some embodiments, the dry beneficiation production system may further include a second filter press 70, which is connected to the reslurry device 60 to further separate the substandard ore after reslurrying. The second filter press 70 may be two different devices from the first filter press 50, or it may be the same device as the first filter press 50. When it is determined that the second filter press 70 and the first filter press 50 are the same filter press, the ore after passing through the reslurry device 60 is recycled back to the first filter press 50. To facilitate understanding of the inventive concept of this application, the embodiments of this application use a filter press where the second filter press 70 and the first filter press 50 are the same as an example. Specifically, when it is determined that the index of the solid (i.e., ore) output from the first filter press 50 is uncontrollable (i.e., MgO > 1.2%), it is cleaned by the reslurry device 60. After the first cleaning in the re-slurry unit 60, the ore undergoes a second solid-liquid separation in the first filter press 50 to verify whether the ore's parameters are controllable. If the parameters are found to be unqualified, the ore after the second filter press is transported to the re-slurry unit for a second cleaning. After the second cleaning, the ore enters the first filter press 50 for a third solid-liquid separation, and the controllability of the ore's parameters is verified again. This process is repeated until the ore's parameters are qualified. Once the ore's parameters are determined to be qualified, it is transported to a storage bin for further use and / or sale. By adding the re-slurry unit 60, further cleaning is no longer required during subsequent filter presses.

[0041] In some embodiments, both the first filter press 50 and the second filter press 70 are provided with two output ends, one for outputting the filtered ore and the other for outputting the filtered filtrate. Furthermore, the output ends of the first filter press 50 and the second filter press 70 for outputting the filtered filtrate are connected to a filtrate recovery device for recovering the filtered filtrate.

[0042] Refer to together Figure 3In some embodiments, the dry beneficiation production system may further include water storage tanks 80, all of which are connected to the wet grinding device 30, the leaching device 40, and the reslurry device 60. For example, the water storage tank 80 may include a first water storage tank, a second water storage tank, and a third water storage tank. The first water storage tank is connected to the wet grinding device 30 and is used to provide the wet grinding device 30 with the required water for wetting during the ore crushing process. The second water storage tank is connected to the leaching device 40 and is used to provide the leaching device 40 with the solvent required for leaching, such as water or acidic solution, to promote ore dissolution. The third water storage tank is connected to the reslurry device 60 and is used to provide the reslurry device 60 with the required water for the reslurry process, so that the reslurry device 60 can clean the ore after pressure filtration and maintain the slurry concentration.

[0043] In some embodiments, the water storage tank 80 may further include a clarification tank and a clear liquid tank. The filtrate output from the first filter press 50 can be clarified in the clarification tank and overflow into the clear liquid tank, then pumped into the filter press and carbonization filter press by the fine filtration filter press pump, and finally pumped into the concentration system for concentration before being sent to the ammonia calcium workshop.

[0044] Refer to together Figure 4 In some embodiments, the dry beneficiation production system may further include a terminal control device 90, which is connected to the crushing device 10, the calcining device 20, the wet grinding device 30, the leaching device 40, the first filter press 50, the re-slurry device 60, the second filter press 70, and the water storage tank 80. This terminal control device 90 enables remote and precise control of the crushing device 10, the calcining device 20, the wet grinding device 30, the leaching device 40, the first filter press 50, the re-slurry device 60, the second filter press 70, and the water storage tank 80. For example, when the crushing device 10 is needed to crush the ore, the terminal control device 90 can control a loader carrying the ore to add it to an inertial vibrating feeder. By setting the vibration parameters of the inertial vibrating feeder, the feeder can crush the ore according to these parameters.

[0045] The working principle of this invention is as follows: After the raw ore is extracted from the mine, it is first crushed and screened by a crushing device to obtain phosphate rock particles that meet the requirements for calcination. These particles are then fed into a calcination device for high-temperature calcination to remove impurities such as organic matter, dolomite, and calcite. The calcined phosphate rock (calcined ore) is then ground by a wet grinding device to form a slurry. The slurry is subsequently transported to a leaching device to react with a leaching solution (such as nitric acid solution) to dissolve the valuable elements in the phosphate rock. Finally, the slurry is separated into solid and liquid components by a filter press to obtain a filter cake and filtrate, thereby improving the recovery efficiency.

[0046] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present utility model.

Claims

1. A dry mineral processing production system, characterized in that, The system includes: a calcination device, a wet grinding device, a leaching device, a first filter press device, and a re-slurry device; The output end of the calcining device is connected to the input end of the wet grinding device, and is used to calcine the ore. The output end of the wet grinding device is connected to the input end of the leaching device, and is used to crush the calcined ore. The output end of the leaching device is connected to the input end of the first pressure filter device, and is used to perform acid leaching treatment on the wet-milled slurry. The output end of the first filter press is connected to the input end of the repulping device, and is used to perform solid-liquid separation on the leached slurry. The re-slurry device is used to clean substandard ore after pressure filtration.

2. The dry mineral processing system according to claim 1, characterized in that, The system also includes a second filter press device, the output end of which is connected to the input end of the second filter press device, for solid-liquid separation of the re-slurryed ore.

3. The dry mineral processing system according to claim 2, characterized in that, The output ends of both the first and second filter press devices are connected to a filtrate recovery device.

4. The dry mineral processing system according to claim 2, characterized in that, The system also includes water storage tanks, which are connected to the wet grinding device, the immersion device, and the re-pulping device.

5. The dry mineral processing system according to claim 1, characterized in that, The calcination apparatus includes a preheater, a rotary calcining kiln, a Roots blower, a pulverized coal burner, and a rotary cooler, with the pulverized coal burner located in the rotary calcining kiln.

6. The dry mineral processing system according to claim 1, characterized in that, The calcination temperature of the calcination device is 950°C to 1150°C, and the calcination time is 1 hour to 1.5 hours.

7. The dry mineral processing system according to claim 1, characterized in that, The leaching device is equipped with a stirring device and a pH adjustment device.

8. The dry mineral processing production system according to claim 1, characterized in that, The leaching solution of the leaching device is a nitric acid solution with a mass percentage concentration of 75%, and the leaching time is 3 to 4.5 hours.

9. The dry mineral processing system according to claim 4, characterized in that, The system also includes a crushing device, the output of which is connected to the input of the calcining device, for crushing the ore before calcination.

10. The dry mineral processing production system according to claim 9, characterized in that, The system also includes terminal control devices, which are connected to the calcination device, the wet grinding device, the leaching device, the first filter press device, the re-slurry device, the second filter press device, the water storage tank, and the pulverizing device.

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