Method for measuring grinding time of grinding machine and grinding sampling system of grinding machine

Abstract

The invention discloses a method for measuring the ore grinding time of a mill, which comprises the following steps of: S1, adding a tracer solution into the ore mill along with mineral aggregate at one time, and recording the time for adding the tracer solution; s2, ore pulp is produced after treatment of the ore grinding machine, a set amount of ore pulp is taken out every preset duration to serve as ore pulp samples, and sampling time is recorded; s3, liquid in the ore pulp sample is extracted to serve as liquid to be tested, and the concentration or strength of the tracer agent in the liquid to be tested is tested; and S4, drawing a time-concentration or intensity curve according to the sampling time of the concentrations or intensities of the tracers in different ore pulp samples, and calculating the ore grinding time of the ore grinding machine through the time-concentration or intensity curve. The invention further discloses an ore grinding sampling system of the mill. The method for determining the ore grinding time of the mill and the ore grinding sampling system of the mill have the advantages of good determination accuracy, convenient whole process operation and the like.

Description

Technical Field

[0001] This invention relates to the field of mineral processing technology, specifically to a method for determining mill grinding time and a mill grinding sampling system. Background Technology

[0002] Ore crushing and grinding is the most energy-intensive process in mining production. Statistics show that ore crushing and grinding accounts for 35% to 50% of the total energy consumption in metal mine production, with grinding operations being particularly prominent, accounting for 80% to 85% of the total energy consumption for ore crushing. As a core process in ore processing plants, the ore processing capacity of grinding operations often determines the plant's overall capacity, and the quality of the ground ore directly affects the technical indicators of subsequent beneficiation operations. Therefore, optimizing grinding operation parameters, especially grinding time, is an important way to achieve energy conservation and consumption reduction, improve the efficiency of ore processing plants, and enhance resource development and utilization.

[0003] In the grinding and classification process, grinding time (i.e., the residence time of ore / pulp in the mill) is one of the most critical parameters, directly affecting grinding efficiency, grinding product quality, and the economic benefits of the concentrator. Specifically, too short a grinding time may result in the ore particle size not meeting the liberation requirements (valuable minerals and gangue not being fully separated), affecting subsequent separation effects; too long a grinding time can easily lead to over-grinding, increasing grinding energy consumption and potentially reducing the recovery rate of valuable minerals. Only by optimizing and controlling the grinding time can sufficient mineral liberation be ensured, creating ideal conditions for subsequent flotation, magnetic separation, and other operations.

[0004] From an energy consumption perspective, the grinding process accounts for 40% to 60% of the total energy consumption of a mineral processing plant. Excessive grinding time significantly increases electricity and steel consumption (due to wear on grinding balls and liners), while also reducing the mill's throughput per unit time, potentially becoming a production bottleneck. For example, in closed-circuit grinding, controlling the circulating load through classification equipment can optimize the balance between grinding time and processing capacity. Practice shows that a reasonable grinding time not only improves technical indicators (recovery rate, concentrate grade) but also significantly reduces production costs, making it one of the core elements for efficient operation of a mineral processing plant. Therefore, determining the mill's grinding time is crucial for optimizing the grinding process and production operation of a mineral processing plant.

[0005] A Chinese patent application with application number 202410169904.0 discloses a grinding work index discrimination system, comprising: a grinding mill system for grinding mineral samples; an online particle size testing system for real-time measurement of the grinding particle size of the slurry within the grinding mill system; and an electrical control system for receiving user-inputted test targets, controlling a media storage system, a mineral sample addition system, and a water addition system according to the test targets, receiving the grinding particle size of the slurry measured by the online particle size testing system, recording the total grinding time, and calculating the grinding work index based on the total grinding time and the test targets. This grinding work index discrimination system records the start-up and stop times of the grinding mill system through the electrical control system, and calculates the total grinding time based on the start-up and stop times, i.e., the total time consumed in grinding the sample from its original particle size to the target product particle size. However, the accuracy of the grinding time measured in this way is poor. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a mill grinding time measurement method and mill grinding sampling system that are accurate, convenient to operate and have a good overall process.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A method for determining the grinding time of a mill includes the following steps: S1. Add the tracer solution into the grinding mill along with the ore in one go, and record the time of adding the tracer solution; S2. After the slurry is processed by the grinding mill, a set amount of slurry is taken out at predetermined intervals as a slurry sample, and the sampling time is recorded. S3. Extract the liquid from the slurry sample as the test liquid, and test the concentration or intensity of the tracer in the test liquid; S4. Plot a time-concentration or intensity curve for the concentration or intensity of the tracer in different slurry samples according to the sampling time, and calculate the grinding time of the mill from the time-concentration or intensity curve.

[0008] As a further improvement to the above technical solution: The tracer solution is a suspension of metal salts, fluorescent particles, or radioactive particles.

[0009] In step S4, the grinding time of the grinding mill is obtained by subtracting the time of adding the tracer solution from the average sampling time corresponding to the peak region of the time-concentration or intensity curve.

[0010] In S3, the liquid to be tested is the supernatant of the slurry sample after it has been allowed to stand.

[0011] In step S3, the liquid to be tested is the filtrate after filtering the slurry sample.

[0012] In step S3, the liquid to be tested is the separation liquid after centrifugation of the slurry sample.

[0013] In step S2, the set amount of slurry taken out is the slurry flowing out of the mill outlet.

[0014] In step S2, a set amount of slurry is extracted by descending at a constant speed perpendicular to the direction of slurry drop.

[0015] In step S2, a sampler is used to extract a set amount of slurry.

[0016] A mill grinding sampling system, applied to the above-mentioned mill grinding time determination method, includes a mill, a sampler, a feed supply pipeline, a tracer solution addition device, and a slurry discharge device. The feed supply pipeline and the tracer solution addition device are both connected to the feed inlet of the mill. The slurry discharge device is located at the discharge outlet of the mill. The sampler is used to collect slurry below the slurry discharge device.

[0017] Compared with the prior art, the advantages of the present invention are as follows: The grinding time determination method of the present invention adopts the method of tracking the addition of tracer to the ore and the outflow of slurry, and calculates the grinding time of the mill by plotting the concentration or intensity of the tracer in the test liquid in the slurry sample. Compared with the existing method in the art of calculating the total grinding time based on the start time and stop time, the grinding time of the mill can be calculated more accurately through the time-concentration or intensity curve, and the overall process is convenient to operate.

[0018] The grinding and sampling system of the present invention uses a tracer to track the addition of ore and the outflow of slurry. By testing the concentration or intensity of the tracer in the test liquid in the slurry sample and plotting a time-concentration or intensity curve, the grinding time of the grinding mill is calculated. Compared with the existing method in the art of calculating the total grinding time based on the start time and stop time, the grinding time of the grinding mill can be calculated more accurately through the time-concentration or intensity curve, and the overall process is convenient to operate. Attached Figure Description

[0019] Figure 1 This is a flowchart of the method for determining the grinding time of a mill according to the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the grinding and sampling system of the present invention.

[0021] The labels in the diagram represent: 1. Grinding mill; 2. Sampler; 3. Ore supply pipeline; 4. Tracer solution addition device; 5. Slurry discharge device. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] Example 1: Figure 1 An embodiment of the mill grinding time determination method of the present invention is shown. The mill grinding time determination method of this embodiment includes the following steps: S1. Add the tracer solution along with the ore into the grinding mill 1 in one go, and record the time of adding the tracer solution; S2. After being processed by the grinding mill 1, the slurry produced is taken out at predetermined intervals (e.g., one minute) as a slurry sample, and the sampling time is recorded. S3. Extract the liquid from the slurry sample as the test liquid, and test the concentration or intensity of the tracer in the test liquid; S4. Plot a time-concentration or intensity curve for the concentration or intensity of the tracer in different slurry samples according to the sampling time, and calculate the grinding time of mill 1 through the time-concentration or intensity curve.

[0027] The present invention provides a method for determining the grinding time of a mill. This method uses a tracer to track the addition of ore and the outflow of slurry. By testing the concentration or intensity of the tracer in the test liquid in the slurry sample and plotting a time-concentration or intensity curve, the grinding time of the mill 1 can be calculated. Compared with the existing method in the art that calculates the total grinding time based on the start-up time and stop time, this method can more accurately calculate the grinding time of the mill 1 through the time-concentration or intensity curve, and the overall process is convenient to operate.

[0028] Furthermore, in this embodiment, the tracer solution is a suspension of metal salts, fluorescent particles, or radioactive particles.

[0029] Further, in this embodiment, in S4, the average sampling time (i.e., average sampling moment) corresponding to the peak region of the time-concentration or intensity curve is subtracted from the time of adding the tracer solution (i.e., the moment of adding the tracer solution) to obtain the grinding time (i.e., grinding duration) of the grinding mill 1. The sampling time minus the time of adding the tracer solution can be considered as the residence time of the tracer and the ore in the grinding mill 1. The average sampling time corresponding to the peak region is the sampling time corresponding to the high concentration of tracer, and subtracting the time of adding the tracer solution gives the grinding time of the grinding mill 1.

[0030] Furthermore, in this embodiment, in S3, the liquid to be tested is the supernatant after the slurry sample has been allowed to stand, the filtrate after the slurry sample has been filtered, or the separated liquid after the slurry sample has been centrifuged.

[0031] Furthermore, in this embodiment, in S2, the set amount of slurry taken out is the slurry flowing out of the outlet of the grinding mill 1, so as to achieve the effect of timely sampling.

[0032] Furthermore, in this embodiment, in S2, a set amount of slurry is taken out by descending at a constant speed perpendicular to the direction of slurry drop, which helps to avoid slurry overflow or splashing.

[0033] Furthermore, in this embodiment, in S2, a sampler 2 is used to extract a set amount of slurry.

[0034] Example 2: Figure 2 An embodiment of the grinding and sampling system of the present invention is shown. The grinding and sampling system of this embodiment is applied to the grinding time determination method of embodiment one. It includes a grinding mill 1, a sampler 2, a feed supply pipeline 3, a tracer solution addition device 4, and a slurry discharge device 5. The feed supply pipeline 3 and the tracer solution addition device 4 are both connected to the feed inlet of the grinding mill 1. The slurry discharge device 5 is located at the discharge outlet of the grinding mill 1. The sampler 2 is used to collect the slurry below the slurry discharge device 5.

[0035] The production process of this grinding and sampling system is as follows: First, the tracer solution is added to the grinding mill 1 along with the ore in the ore supply pipeline 3 through the tracer solution addition device 4, and the time of addition is recorded. Second, after the ore is processed by the grinding mill 1, a slurry is produced. Every predetermined time interval (e.g., one minute), a sampler 2 is used to collect a set amount of slurry discharged from the slurry discharge device 5 as a slurry sample, and the sampling time is recorded. Third, the liquid in the slurry sample is extracted as the test liquid, and the concentration or intensity of the tracer in the test liquid is tested. Fourth, the concentration or intensity of the tracer in different slurry samples is plotted as a time-concentration or intensity curve according to the sampling time, and the grinding time of the grinding mill 1 is calculated from the time-concentration or intensity curve.

[0036] This grinding mill sampling system uses a tracer to track the addition of ore and the outflow of slurry. By testing the concentration or intensity of the tracer in the test liquid in the slurry sample and plotting a time-concentration or intensity curve, the grinding time of mill 1 can be calculated. Compared with the existing method in the field that calculates the total grinding time based on the start-up time and stop time, this system can more accurately calculate the grinding time of mill 1 through the time-concentration or intensity curve, and the overall process is convenient to operate.

[0037] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A method for determining the grinding time of a mill, characterized in that, Includes the following steps: S1. Add the tracer solution along with the ore into the grinding mill (1) at one time, and record the time of adding the tracer solution; S2. After being processed by the grinding mill (1), the slurry is produced. A set amount of slurry is taken out every predetermined time interval as a slurry sample, and the sampling time is recorded. S3. Extract the liquid from the slurry sample as the test liquid, and test the concentration or intensity of the tracer in the test liquid; S4. Plot a time-concentration or intensity curve based on the sampling time for the concentration or intensity of the tracer in different slurry samples, and calculate the grinding time of the mill (1) using the time-concentration or intensity curve.

2. The method for determining grinding time in a mill according to claim 1, characterized in that: The tracer solution is a suspension of metal salts, fluorescent particles, or radioactive particles.

3. The method for determining grinding time in a mill according to claim 1, characterized in that: In S4, the average sampling time corresponding to the peak region of the time-concentration or intensity curve minus the time of adding the tracer solution is used as the grinding time of the grinding mill (1).

4. The method for determining grinding time in a mill according to claim 1, characterized in that: In S3, the liquid to be tested is the supernatant of the slurry sample after it has been allowed to stand.

5. The method for determining grinding time in a mill according to claim 1, characterized in that: In step S3, the liquid to be tested is the filtrate after filtering the slurry sample.

6. The method for determining grinding time in a mill according to claim 1, characterized in that: In step S3, the liquid to be tested is the separation liquid after centrifugation of the slurry sample.

7. The method for determining grinding time of a mill according to any one of claims 1 to 6, characterized in that: In S2, the set amount of slurry is taken out from the outlet of the grinding mill (1).

8. The method for determining grinding time in a mill according to claim 7, characterized in that: In step S2, a set amount of slurry is extracted by descending at a constant speed perpendicular to the direction of slurry drop.

9. The method for determining grinding time in a mill according to claim 7, characterized in that: In S2, a sampler (2) is used to take out a set amount of slurry.

10. A mill grinding sampling system, characterized in that: The grinding time determination method for a mill, applicable to any one of claims 1 to 9, includes a mill (1), a sampler (2), a feed supply pipeline (3), a tracer solution addition device (4), and a slurry discharge device (5). The feed supply pipeline (3) and the tracer solution addition device (4) are both connected to the feed inlet of the mill (1). The slurry discharge device (5) is located at the discharge outlet of the mill (1). The sampler (2) is used to collect slurry below the slurry discharge device (5).

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