Method for measuring mud layer interface between thickening pool and settling tank

Abstract

The invention discloses a method for measuring a mud layer interface between a thickening tank and a settling tank, which comprises the following steps of: descending a detection head of a conductivity detector from the top of the thickening tank or the settling tank in a vertical linear motion manner until the detection head reaches a preset measuring range position; when the detection head descends, a conductivity value is detected and recorded in real time, change nodes of each conductivity are recorded, and interface conditions corresponding to the nodes are as follows: the first node is corresponding to a gas-liquid interaction interface when the conductivity is suddenly changed from low to high; the initial point is a second node and corresponds to an interaction interface of the alkali liquor and the mixed layer; a starting point where the conductivity is gradually reduced to be stable and no longer reduced is a third node and corresponds to an interactive interface of the mixing layer and the mud layer. The problems that manual detection is inaccurate and the timeliness is poor can be solved, the detection burden of front-line workers can be effectively reduced, the product quality is guaranteed, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mud layer detection in the metallurgical industry, and particularly relates to a method for measuring the mud layer interface of a thickener and a settling tank. Background Art

[0002] The metallurgical industry is a basic industry and also the raw material source for the manufacturing industry, the automotive industry, and civil bridge engineering. Among them, the iron separation industry is an important part of the metallurgical industry. In the process of iron separation production, the settling tank and the thickener are the top priorities in the production process. In the process of sedimentation and thickening, the sedimentation effect of the material medium is related to the efficiency of the entire process and the quality and output of subsequent production. In the existing production process, the height of the medium in the tank is mainly measured manually, which has poor timeliness and large errors, resulting in poor control effect of the flocculant in the production process, easy occurrence of running muddy, and reduction of the efficiency of the entire production process. Moreover, when the production tank is exposed to the sun in summer, the surface temperature of the tank reaches 70°C, which places a great burden on the workers.

[0003] The existing density demarcation detection equipment and ultrasonic sludge detection equipment cannot adapt to the high temperature or high alkalinity in the production process. The existing contact type mud layer interface instrument cannot distinguish the sedimentation layer (mixed layer). Moreover, it has defects such as complex maintenance means and high cost. The existing sludge concentration meter using the optical principle can also measure the position of the medium stratification, but the high temperature and high alkalinity environment on site will make the equipment particularly easy to be damaged and require a lot of maintenance, which is not practical. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for measuring the mud layer interface of a thickener and a settling tank, which can solve the problems of inaccurate manual detection and poor timeliness, can effectively reduce the detection burden of front-line workers, ensure product quality, and improve production efficiency.

[0005] The method for measuring the mud layer interface of the thickener and the settling tank includes the following steps: Lower the detection head of the conductivity detector from the top of the thickener or the settling tank in a vertical linear motion until it reaches the preset range position; When the detection head is lowered, the conductivity value is detected and recorded in real time, and the change nodes of each conductivity are recorded. The interface conditions corresponding to the nodes are as follows: The first node is where the conductivity suddenly changes from low to high, corresponding to the gas-liquid interaction interface; The second node is the starting point where the conductivity gradually decreases from high, corresponding to the interface between the lye and the mixed layer; The third node is the starting point where the conductivity gradually decreases to a stable state and no longer decreases, corresponding to the interface between the mixed layer and the mud layer.

[0006] The conductivity of the first node changes suddenly from 0 to 200 - 600 ms / cm.

[0007] The wire connecting the conductivity detector to the detection head is wound around the turntable. The lifting is driven by a stepper motor controlled by the control device, and the conductivity data at the front end is collected by the control device and transmitted to the host computer. Meanwhile, the control device collects the angle of the motor rotation, converts it into distance, and transmits it to the host computer for processing to find the point where the conductivity data jumps, so as to obtain the interface positions of various substances in the tank. Or the control device controls the stepper motor to move in a uniform straight line, lowers the detection head of the conductivity detector from the top of the thickener or sedimentation tank, records the time corresponding to each node, converts the distance from the speed and time, and transmits it to the host computer for processing to find the point where the conductivity data jumps, so as to obtain the interface positions of various substances in the tank.

[0008] The control device is a PLC.

[0009] The speed of the uniform straight-line movement of the conductivity detector is 5 - 13 cm / s.

[0010] It also includes a cleaning device installed at the top of the thickener or sedimentation tank. When the detection head moves to the range position, the control device returns a measurement stop signal to the host computer and controls the stepper motor to retract the detection head. When the detection head returns to its original position, the cleaning device is controlled to clean the detection head.

[0011] The cleaning device includes a bracket, a cleaning nozzle, and an origin sensor. The cleaning nozzle is installed at the top of the thickener or sedimentation tank through the bracket. The cleaning nozzle is connected to an external water supply device through a pipeline. An origin sensor is set on the bracket to detect whether the detection head returns to its original position.

[0012] In the sedimentation process of iron ore separation and alumina, the present invention utilizes the obvious regular change of the conductivity of different media. In view of this characteristic, for the first time, the conductivity curve at different heights is measured by a conductivity sensor, and the inflection point of the change is found to accurately measure the stratification of different media. This method analyzes the points of conductivity change in the data instead of using absolute values to judge the stratification position, and will not be affected by inaccurate analysis caused by unstable processes, with high adaptability.

[0013] The principle and calculation process of the present invention are as follows: ① In the sedimentation tank, the clear liquid is lye, with good conductivity. After mixing with the mud layer, the conductivity will decrease.

[0014] ② In the sedimentation tank, due to the lye vapor, there is conductivity on the liquid surface, but the conductivity is low, and there is an obvious difference in the conductivity compared with that of the lye.

[0015] ③The conductivity is different due to the different degrees of mixing between the mud layer and the clear liquid. The higher the degree of mixing, the lower the conductivity. Since the clear liquid contains less mud, the conductivity is at a high point and stable. In the sedimentation layer (mixing layer), the degree of mixing increases with the decrease in height, resulting in a gradual decrease in conductivity. After reaching the mud layer, the conductivity remains unchanged due to stable sedimentation.

[0016] ④According to the above rules, when the conductivity is detected to rise instantaneously, it is judged that the liquid level has been reached.

[0017] ⑤During the movement of the probe, when the conductivity is detected to start decreasing gradually, it is judged that the sedimentation layer (mixing layer) has been reached. ⑥When the conductivity stops decreasing and remains stable, it is judged that the mud layer has been reached.

[0018] The present invention has the following advantages: The method of the present invention can accurately distinguish the boundary positions of the liquid level, the sedimentation layer (mixing layer), and the mud layer, and can intuitively display the heights and states of different media in the tank.

[0019] The test of the present invention can obtain results in real-time, with high speed and efficiency. By adjusting the feeding and discharging rates of the tank according to the height of the mud layer, the tank can always maintain the best sedimentation state. At the same time, the addition of flocculant can be adjusted according to the height of the sedimentation layer (mixing layer), thus saving the use of additives.

[0020] The present invention can measure and obtain results in real-time, solving the problems of inaccurate manual detection and poor timeliness, reducing the detection burden of front-line workers, ensuring product quality, improving production efficiency, maintaining the enterprise's reputation. At the same time, the detection results can also help production enterprises trace problems in the production process, thereby optimizing production processes and procedures. Specific embodiments

[0021] To better understand the present invention, it is illustrated by the following examples. These examples belong to the protection scope of the present invention, but do not limit the protection scope of the present invention. Example 1

[0022] The method for measuring the mud layer interface of a thickening tank includes the following steps: Lower the detection head of the conductivity detector from the top of the thickening tank in a vertical linear motion until it reaches the preset range position; When the detection head is lowered, the conductivity value is detected and recorded in real-time, and the change nodes of each conductivity are recorded. The interface conditions corresponding to the nodes are as follows: The first node is when the conductivity suddenly changes from low to high, corresponding to the gas-liquid interface; The second node is the starting point when the conductivity gradually decreases from high, corresponding to the interface between the lye and the mixing layer; The starting point at which the conductivity gradually decreases to a stable state without further decline is the third node, corresponding to the interface between the mixed layer and the mud layer.

[0023] The conductivity of the first node changes suddenly from 0 to 200 - 300 ms / cm.

[0024] The wire connecting the conductivity detector to the detection head is wound around the turntable. The lifting is driven by a stepping motor controlled by the control device, and the control device collects the conductivity data at the front end and transmits it to the host computer. The control device is a PLC. At the same time, the control device collects the angle of the motor rotation, converts it into distance, and transmits it to the host computer for processing to find the point where the conductivity data jumps, so as to obtain the interface positions of various substances in the tank.

[0025] A cleaning device is arranged at the top of the thickener. The cleaning device includes a bracket, a cleaning nozzle, and an origin sensor. The cleaning nozzle is installed on the top of the thickener or the settling tank through the bracket. The cleaning nozzle is connected to an external water supply device through a pipeline. An origin sensor is arranged on the bracket to detect whether the detection head returns to the original position.

[0026] When the detection head moves to the full-scale position, the control device will return a measurement stop signal to the host computer and control the stepping motor to retract the detection head. When the detection head returns to the original position, the control device controls the cleaning device to clean the detection head. Embodiment 2

[0027] A method for measuring the interface of the mud layer in a settling tank includes the following steps: Lower the detection head of the conductivity detector vertically in a straight line from the top of the settling tank until it reaches the preset full-scale position. When the detection head descends, the conductivity value is detected and recorded in real time, and the change nodes of each conductivity are recorded. The interface conditions corresponding to the nodes are as follows: The conductivity suddenly changes from low to high at the first node, corresponding to the gas-liquid interface. The starting point at which the conductivity gradually decreases from high is the second node, corresponding to the interface between the lye and the mixed layer. The starting point at which the conductivity gradually decreases to a stable state without further decline is the third node, corresponding to the interface between the mixed layer and the mud layer.

[0028] The conductivity of the first node changes suddenly from 0 to 500 - 600 ms / cm.

[0029] The wire connecting the conductivity detector to the detection head is wound around the turntable. The lifting is driven by a stepping motor controlled by the control device, and the control device collects the conductivity data at the front end and transmits it to the host computer. The control device is a PLC. Meanwhile, the control device controls the stepper motor to move linearly at a constant speed of 5 cm / s to lower the detection head of the conductivity detector from the top of the thickener or sedimentation tank, records the time corresponding to each node, calculates the distance from the speed and time, transmits it to the host computer for processing, finds the point where the conductivity data jumps, and obtains the interface positions of various substances in the tank.

[0030] A cleaning device is arranged at the top of the sedimentation tank. The cleaning device includes a bracket, a cleaning nozzle, and an origin sensor. The cleaning nozzle is installed at the top of the thickener or sedimentation tank through the bracket. The cleaning nozzle is connected to an external water supply device through a pipeline. An origin sensor is arranged on the bracket to detect whether the detection head returns to the original position.

[0031] When the detection head moves to the full-scale position, the control device returns a measurement stop signal to the host computer and controls the stepper motor to retract the detection head. When the detection head returns to the original position, the control device controls the cleaning device to clean the detection head. Embodiment 3

[0032] A method for measuring the interface of the sludge layer in a thickener includes the following steps: Lower the detection head of the conductivity detector from the top of the thickener or sedimentation tank in a vertical linear motion until it reaches the preset full-scale position; When the detection head descends, the conductivity value is detected and recorded in real time, and the change nodes of each conductivity are recorded. The interface conditions corresponding to the nodes are as follows: The first node where the conductivity suddenly changes from low to high corresponds to the gas-liquid interaction interface; The starting point where the conductivity gradually decreases from high is the second node, corresponding to the interface between the lye and the mixed layer; The starting point where the conductivity gradually decreases to a stable state and no longer decreases is the third node, corresponding to the interface between the mixed layer and the sludge layer.

[0033] The conductivity of the first node suddenly changes from 0 to 300 - 400 ms / cm.

[0034] The wire connecting the conductivity detector to the detection head is wound on a turntable. The control device controls the stepper motor to drive the lifting, and the control device collects the conductivity data at the front end and transmits it to the host computer; the control device is a PLC; Meanwhile, the control device controls the stepper motor to move linearly at a constant speed of 13 cm / s to lower the detection head of the conductivity detector from the top of the thickener or sedimentation tank, records the time corresponding to each node, calculates the distance from the speed and time, transmits it to the host computer for processing, finds the point where the conductivity data jumps, and obtains the interface positions of various substances in the tank.

[0035] A cleaning device is provided at the top of the thickener or settling tank. The cleaning device includes a bracket, a cleaning nozzle, and an origin sensor. The cleaning nozzle is installed on the top of the thickener or settling tank through the bracket. The cleaning nozzle is connected to an external water supply device through a pipeline. An origin sensor is provided on the bracket for detecting whether the detection head returns to its original position.

[0036] When the detection head moves to the full-scale position, the control device will return a measurement stop signal to the host computer and control the stepping motor to retract the detection head. When the detection head returns to its original position, the control device controls the cleaning device to clean the detection head. Embodiment 4

[0037] The method for measuring the sludge layer interface in the thickener includes the following steps: Lower the detection head of the conductivity detector vertically and linearly from the top of the thickener or settling tank until it reaches the preset full-scale position. When the detection head descends, the conductivity value is detected and recorded in real time, and the change nodes of each conductivity are recorded. The corresponding interface conditions of the nodes are as follows: The first node is where the conductivity suddenly changes from low to high, corresponding to the gas-liquid interface. The second node is the starting point where the conductivity gradually decreases from high, corresponding to the interface between the lye and the mixed layer. The third node is the starting point where the conductivity gradually decreases to a stable state and no longer decreases, corresponding to the interface between the mixed layer and the sludge layer.

[0038] The conductivity of the first node suddenly changes from 0 to 400 - 500 ms / cm.

[0039] The wire connecting the conductivity detector to the detection head is wound around a turntable. The control device controls the stepping motor to drive the lifting and collects the conductivity data at the front end and transmits it to the host computer. The control device is a PLC. At the same time, the control device controls the stepping motor to move the detection head of the conductivity detector vertically and linearly downward from the top of the thickener or settling tank at a constant speed of 10 cm / s, records the time corresponding to each node, calculates the distance from the speed and time, transmits it to the host computer for processing, finds the point where the conductivity data jumps, and obtains the interface positions of various substances in the tank.

[0040] A cleaning device is provided at the top of the thickener or settling tank. The cleaning device includes a bracket, a cleaning nozzle, and an origin sensor. The cleaning nozzle is installed on the top of the thickener or settling tank through the bracket. The cleaning nozzle is connected to an external water supply device through a pipeline. An origin sensor is provided on the bracket for detecting whether the detection head returns to its original position. When the detection head moves to the full-scale position, the control device will return a measurement stop signal to the host computer and control the stepping motor to retract the detection head. When the detection head returns to its original position, the control device controls the cleaning device to clean the detection head.

[0041] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A measuring method for the sludge layer interface in a thickener and a settling tank, characterized in that, It includes the following steps: Lower the detection head of the conductivity detector vertically in a straight line from the top of the thickener or settling tank until it reaches the preset range position; When the detection head is lowered, the conductivity value is detected and recorded in real time, and the change nodes of each conductivity are recorded. The corresponding interface conditions of the nodes are as follows: The first node is where the conductivity suddenly changes from low to high, corresponding to the gas-liquid interaction interface; The second node is the starting point where the conductivity gradually decreases from high, corresponding to the interface between the lye and the mixed layer; The third node is the starting point where the conductivity gradually decreases to a stable state and no longer decreases, corresponding to the interface between the mixed layer and the mud layer.

2. The sludge layer interface measurement method for the thickener and settling tank according to claim 1, wherein: The conductivity of the first node suddenly changes from 0 to 200 - 600 ms / cm.

3. The method for measuring the mud layer interface of the thickener and the settling tank according to claim 1, wherein: The wire connecting the detection head of the conductivity detector is wound on a turntable, and the lifting is driven by a stepping motor controlled by a control device, and the conductivity data at the front end is collected by the control device and transmitted to the upper computer; At the same time, the control device collects the angle of the motor rotation, converts it into distance and transmits it to the upper computer for processing to find the point where the conductivity data jumps, and obtains the interface positions of various substances in the tank; or the control device controls the stepping motor to move vertically in a straight line at a constant speed to lower the detection head of the conductivity detector from the top of the thickener or settling tank, records the time corresponding to each node, calculates the distance from the speed and time, transmits it to the upper computer for processing, finds the point where the conductivity data jumps, and obtains the interface positions of various substances in the tank.

4. The sludge layer interface measurement method for the thickener and the settling tank according to claim 3, characterized in that: The control device is a PLC.

5. The sludge layer interface measurement method for the thickening tank and the settling tank according to claim 3, characterized in that: The speed of the linear motion of the conductivity detector at a constant speed is 5 - 13 cm / s.

6. The method for measuring the mud layer interface of the thickener and the settling tank according to claim 4, wherein: It further includes a cleaning device installed on the top of the thickener or settling tank. When the detection head moves to the range position, the control device returns a measurement stop signal to the upper computer and controls the stepping motor to retract the detection head. When the detection head returns to the original position, the control device controls the cleaning device to clean the detection head.

7. The method for measuring the mud layer interface of the thickener and the settling tank according to claim 6, wherein: The cleaning device includes a bracket, a cleaning nozzle, and an origin sensor. The cleaning nozzle is installed on the top of the thickener or settling tank through the bracket. The cleaning nozzle is connected to an external water supply device through a pipeline. The origin sensor is set on the bracket to detect whether the detection head returns to the original position.