CN112985506B - Method for mutual calculation of mud layer height and mud layer pressure of deep cone thickener - Google Patents
Method for mutual calculation of mud layer height and mud layer pressure of deep cone thickener Download PDFInfo
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Abstract
The invention provides a method for mutually calculating the height of a mud layer and the pressure of the mud layer of a deep cone thickener, and belongs to the technical field of filling. The method is based on the fluid mechanics theory, divides the bottom pressure of the deep cone thickener into the sum of the net water height pressure and the mud layer height forming pressure, and deduces and provides a mutual calculation method of the mud layer height and the pressure of the deep cone thickener. Firstly, a pressure gauge is installed at the bottom of a thickener and connected to a data acquisition device or a central control room, and the height of a limit mud layer is calculated according to the size parameters of the deep cone thickener; secondly, measuring the purified water pressure value in an overflow state; fitting and regressing a relation between the height of the mud layer and the pressure and a unit mud layer height pressure value according to the height of the mud layer and corresponding mud layer pressure data; and finally, substituting the height of the limit mud layer into a relational expression to calculate the pressure of the limit mud layer, and adjusting according to the actual needs of the mine by taking the pressure as the basis. The method has the advantages of clear physical significance, easy measurement and simple application, and is suitable for deep cone thickeners of various sizes.
Description
Technical Field
The invention relates to the technical field of filling, in particular to a method for mutually calculating the height of a mud layer and the pressure of the mud layer of a deep cone thickener.
Background
The deep cone thickener is widely applied to the fields of mining, metallurgy, chemical engineering, wastewater treatment and the like, and the principle is that solid and liquid are separated through the combined action of the rotation of an internal rake frame and the pressure of an upper mud layer, so that underflow with higher concentration is obtained. In the actual work of the deep cone thickener, the height and the pressure of a mud layer are very important technical parameters, because the technical parameters such as the stability of the underflow, the torque of a rake frame, the concentration of the underflow and the like are directly influenced. The larger the mud layer pressure is, the larger the torque borne by the rake frame in the deep cone thickener is, and the working efficiency of the rake frame is influenced when the bearing range is exceeded; under the same condition, the larger the mud layer pressure is, the more compact the tailings at the bottom of the deep cone thickener is, the larger the underflow concentration is, and the stable and reasonable underflow concentration ensures the concentration and strength of a filling body, which also has great significance for the continuous and high-efficiency filling of mines.
Due to the complexity of slurry materials in the deep cone thickener, the height of a mud layer and the pressure of the mud layer in the device are difficult to accurately obtain. At present, the measuring means of the height of the mud layer mainly comprises an ultrasonic or optical measuring instrument and a weight type measuring instrument. The ultrasonic or optical measuring instrument is influenced by factors such as density change of a mud layer, turbidity, slurry adhesion of a measuring probe and the like, so that the measuring precision is difficult to meet. The heavy hammer type measuring instrument has higher precision, but is easy to interfere with devices such as a rake rack and the like in the device, and has great limitation. For the mud layer pressure intensity, the accuracy of the mud layer pressure intensity is also greatly related to the installation mode and the position of the pressure intensity meter.
Based on the knowledge, the invention provides a method for mutually calculating the height of a mud layer and the pressure intensity of the mud layer of a deep cone thickener. And a technical method basis is provided for measuring the height of a mud layer and the pressure intensity of the mud layer and controlling the concentration of the underflow of the deep cone thickener.
Disclosure of Invention
The invention aims to provide a method for mutually calculating the height of a mud layer and the pressure of the mud layer of a deep cone thickener, which is based on the fluid mechanics theory, divides the bottom pressure of the deep cone thickener into the sum of the height pressure of clean water and the height forming pressure of the mud layer, and deduces and provides a method for mutually calculating the height and the pressure of the mud layer of the deep cone thickener according to the theory.
The method comprises the steps that firstly, a pressure gauge is installed at the bottom of a thickener and connected to a data acquisition device or a central control room, and the height of a limit mud layer is calculated according to the size parameters of the deep cone thickener; secondly, measuring the purified water pressure value in the overflow state; fitting and regressing a relation between the height of the mud layer and the pressure and a unit mud layer height pressure value according to the height of the mud layer and corresponding mud layer pressure data; and finally, substituting the height of the limit mud layer into a relational expression to calculate the pressure of the limit mud layer, and adjusting according to the actual needs of the mine by taking the pressure as the basis.
The method specifically comprises the following steps:
s1: installing a pressure meter at the bottom of the deep cone thickener, and connecting the pressure meter to dataCollecting device or central control room, and calculating the height h of the limit mud layer of the deep cone thickener m ；
S2: measuring the purified water pressure value p under the overflow state of the deep cone thickener 0 ；
S3: obtaining the height pressure p' of the unit mud layer through linear regression so as to obtain a relation between the mud layer pressure and the mud layer height;
s4: substituting the height of the limit mud layer obtained in the step S1 into the relational expression obtained in the step S3 to obtain the pressure p of the limit mud layer Extreme limit Therefore, adjustment is made according to the engineering requirement according to the ultimate mud layer pressure.
Wherein S1 is the middle limit mud layer height h m The maximum mud layer height of the slurry in a non-running mixing state is determined by the formula (1):
h m ＝h general assembly -h Watch (A) -h Medicine for treating acute respiratory syndrome (1)
Wherein h is General assembly The total height of the deep cone thickener is m; h is Watch (CN) The distance m between the pressure gauge and the bottom of the deep cone thickener is shown; h is Medicine for treating acute respiratory syndrome To minimize the height of the supernatant layer without running any mixing, it is preferable to take 3m according to empirical values.
And the clean water pressure value in the S2 is the pressure value displayed by the pressure gauge when the deep cone thickener is filled with clean water.
And in the S3, the relation between the mud layer pressure and the mud layer height is (2):
p＝p 0 +p'h (2)
wherein p is the mud layer pressure generated by the height of the mud layer, pa; h is the height of the mud layer, m.
Under the normal working condition, the pressure formed by the mud layer is gradually increased along with the increase of the height of the mud layer, the mud layer pressure which is not less than 5 groups and the height data of the corresponding mud layer are measured and regressed to obtain the relation curve of the height of the mud layer and the pressure of the mud layer, and the slope of the relation curve is the height pressure p' of the unit mud layer.
And S3, the height of the mud layer is obtained by adopting a heavy hammer method or a mud layer interface instrument method, the number of times of measurement of each group is not less than 3, and the average value of the number of times of measurement is taken as the final mud layer height of the group.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the bottleneck that the height of the mud layer of the deep cone thickener and the pressure of the mud layer are difficult to accurately measure is broken through, and the method for mutually calculating the height of the mud layer of the deep cone thickener and the pressure of the mud layer is provided. The main advantages are embodied in the following three aspects: firstly, the physical significance in the relation between the height of the mud layer and the pressure of the mud layer is clear, each data measuring method is simple and quick, and only a mutual calculation relation is established between the height of the mud layer and the pressure of the mud layer at the beginning of the operation of the deep cone thickener; secondly, the application is simple, real-time monitoring can be completed only by one pressure gauge without excessive accessory devices, the production cost is reduced, and the influence of large measurement error and even instrument failure of the traditional measuring device on production is avoided; thirdly, the method is good in universality, the method is suitable for deep cone thickeners of various sizes, and the mutual calculation relationship between the mud layer pressure and the mud layer height can be found only by calculating the unit mud layer pressure according to the specific parameters of the device. The method is suitable for various mine enterprises which adopt the full tailing paste filling technology, such as nonferrous metal, black metal, precious metal, rare metal, gold and the like.
Drawings
FIG. 1 is a schematic diagram of the structure and parameters of the method for mutually calculating the height of a mud layer and the pressure of the mud layer of the deep cone thickener according to the invention;
FIG. 2 is a graph showing the relationship between the height of a mud layer and the pressure of the mud layer of a deep cone thickener in China;
FIG. 3 is a diagram showing the relationship between the height of a mud layer and the pressure of the mud layer in a deep cone thickener abroad.
Wherein: 1-deep cone thickener, 2-pressure gauge, 3-data collector, 4-weight type measuring instrument
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a mutual calculation method for the height of a mud layer and the pressure intensity of the mud layer of a deep cone thickener.
As shown in figure 1, the method comprises the steps of firstly installing a pressure gauge at the bottom of a thickener, connecting the pressure gauge to a data acquisition device or a central control room, and calculating the height of a limit mud layer according to the size parameters of the deep cone thickener; secondly, measuring the purified water pressure value in an overflow state; fitting and regressing a relation between the height of the mud layer and the pressure and a unit mud layer height pressure value according to the height of the mud layer and corresponding mud layer pressure data; and finally, substituting the height of the limit mud layer into a relational expression to calculate the pressure intensity of the limit mud layer, and adjusting according to the actual needs of the mine by taking the pressure intensity as a basis.
The method specifically comprises the following steps:
s1: a pressure meter 2 is arranged at the bottom of the deep cone thickener 1, the pressure meter 2 is connected to a data acquisition unit 3, and the height h of the limit mud layer of the deep cone thickener is calculated m ；
The height h of the limit mud layer m The maximum mud layer height of the slurry in a non-running mixing state is determined by the formula (1):
h m ＝h general assembly -h Watch (A) -h Medicine for treating acute respiratory syndrome (1)
Wherein h is General assembly The total height of the deep cone thickener is m; h is Watch (A) The distance m from the pressure gauge to the bottom of the deep cone thickener is shown; h is Medicine for treating acute respiratory syndrome To minimize the height of the supernatant layer without running any mixing, 3m is generally taken from empirical values. h is Water (W) Is the purified water level.
S2: measuring the purified water pressure value p under the overflow state of the deep cone thickener 0 ；
The clean water pressure value is the pressure value displayed by the pressure meter when the deep cone thickener is filled with clean water.
S3: obtaining the unit mud layer height pressure p' through linear regression, thereby obtaining a relation formula (2) of mud layer pressure and mud layer height:
p＝p 0 +p'h (2)
wherein p is the mud layer pressure generated by the height of the mud layer, pa; h is the height of the mud layer, m; under the normal working condition, the pressure formed by the mud layer is gradually increased along with the increase of the height of the mud layer, at least 5 groups of mud layer pressure and corresponding mud layer height data are measured and regressed to obtain a relation curve of the height of the mud layer and the pressure of the mud layer, and the slope of the relation curve is the height pressure of the unit mud layer.
S4: limiting mud layer obtained in S1Obtaining the limiting mud layer pressure p by the height drive-in type (2) Extreme limit And adjustment can be made according to the engineering requirement according to the ultimate mud layer pressure.
And in the S3, the height of the mud layer is obtained by adopting a heavy hammer type measuring instrument 4 or a mud layer interface instrument method, the measuring times of each group are not less than 3 times, and the average value of the measuring times is taken as the final height of the mud layer.
The following description is given with reference to specific examples.
Example 1
A deep cone thickener of a certain domestic manufacturer is adopted for certain iron ore, the diameter of the thickener is 14m, the total height of the thickener is 12m, the height of a straight wall is 8m, the depth of a cone bottom is 4m, the cone angle is 30 degrees, the torque is 120 ten thousand Nm, the processing capacity is 79t/h, and the underflow concentration is 65 percent.
Firstly, a pressure gauge is arranged at the bottom of the deep cone thickener, and the pressure gauge is arranged at a position 1.6m away from the bottom of the deep cone thickener and is connected to an information acquisition device. Calculating the limit mud layer height of the deep cone thickener to be 7.4m according to each parameter of the deep cone thickener provided by a manufacturer by the formula (1), filling the whole deep cone thickener with water without tailing, and measuring the pressure p at the moment 0 At 102.0kPa, the water was then tapped off completely, tailings were added gradually, and the height and pressure of the various layers were measured as shown in table 1.
TABLE 1 relation between the height of a deep cone thickener mud layer and the pressure of the mud layer in China
Fitting and regressing unit mud layer height pressure change p' =12.066kPa/m according to the data in the table 1 to obtain a relation formula (3) of mud layer pressure and mud layer degree:
p＝12.066h+102 (3)
and (5) drawing a relation graph of the height of the mud layer and the pressure of the mud layer, as shown in figure 2. From the equation, it can be seen that when the mud layer height is 0m, the theoretical pressure value is 106.6kPa, which is similar to the measured value of 102.0 kPa. Finally, the height h of the limit mud layer is brought into based on the formula (3) m The pressure of the limiting mud layer is obtained to be 191.3kPa, and the pressure is adjusted according to the actual requirement based on the pressureThe height of the mud layer.
Example 2
A copper ore adopts a deep cone thickener of a certain foreign manufacturer, the diameter of the thickener is 18m, the total height is 16.6m, the height of a straight wall is 10m, the cone angle is 30 degrees, the torque is 270 ten thousand Nm, the processing capacity is 5000t/d, the maximum underflow flow is 265m 3 The underflow concentration was 70%.
Firstly, a pressure gauge is arranged at the bottom of the deep cone thickener, and the pressure gauge is arranged at a position 1.5m away from the bottom of the deep cone thickener and is connected to an information acquisition device. Calculating the limit mud layer height of the deep cone thickener to be 12.1m according to each parameter of the deep cone thickener provided by a manufacturer by the formula (1), filling the whole deep cone thickener with water without tailing, and measuring the pressure p at the moment 0 At 140.0kPa, the water was then tapped off completely and tailings added gradually, as measured by different mud bed heights and pressures, as shown in table 2.
TABLE 2 foreign relation between the height of the mud layer and the pressure of the mud layer in a deep cone thickener
Fitting and regressing unit mud layer height pressure change p' =6.5992kPa/m according to the data in the table 2 to obtain a relation formula (4) of mud layer pressure and mud layer degree:
p＝6.5992h+140 (4)
and (5) drawing a relation graph of the height of the mud layer and the pressure of the mud layer, as shown in figure 3. From the formula, it can be seen that when the height of the mud layer is 0m, the theoretical pressure value is 140.83kPa, which is substantially consistent with the measured value of 140.0 kPa. Finally, the height h of the limit mud layer is brought into based on the formula (4) m And obtaining the limit mud layer pressure of 219.85kPa, and adjusting the height of the mud layer according to actual needs by taking the limit mud layer pressure as the basis.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (2)
1. A mutual calculation method for the height of a mud layer and the pressure intensity of the mud layer of a deep cone thickener is characterized by comprising the following steps: the method comprises the following steps:
s1: installing a pressure meter (2) at the bottom of the deep cone thickener (1), connecting the pressure meter (2) to a data collection device or a central control room, and calculating the height h of the limit mud layer of the deep cone thickener (1);
m
s2: measuring the purified water pressure value p under the overflow state of the deep cone thickener (1) 0 ；
S3: obtaining the height pressure p' of the unit mud layer through linear regression so as to obtain a relation between the mud layer pressure and the mud layer height;
s4: substituting the height of the limit mud layer obtained in the step S1 into the relational expression obtained in the step S3 to obtain the pressure p of the limit mud layer Extreme limit So as to adjust the engineering requirement according to the ultimate mud layer pressure;
the height h of the limit mud layer in the S1 is the maximum mud layer height reached by the slurry under the state of no running and mixing,
m
determined by equation (1):
h m ＝h general (1) -h Watch (A) -h Medicine for treating acute respiratory syndrome (1)
Wherein h is General assembly The total height of the deep cone thickener is m; h is Watch (A) The distance between the pressure gauge and the bottom of the deep cone thickener is m; h is Medicine for treating acute respiratory syndrome The minimum clear solution layer height under the condition of no mixing;
measuring at least 5 groups of mud layer pressure and corresponding mud layer height data in the S3, and regressing to obtain a relation curve of mud layer height and mud layer pressure, wherein the slope of the curve is unit mud layer height pressure p';
the purified water pressure value in the S2 is the pressure value displayed by a pressure meter when the deep cone thickener (1) is filled with the purified water;
the relation formula (2) between the mud layer pressure and the mud layer height in the S3 is as follows:
p＝p 0 +p'h (2)
wherein p is the mud layer pressure generated by the height of the mud layer, pa; h is the height of the mud layer, m;
and in S3, the height of the mud layer is obtained by adopting a heavy hammer method or a mud layer interface instrument method, the number of times of measurement of each group is not less than 3, and the average value of the number of times of measurement is taken as the final mud layer height of the group.
2. The deep cone thickener mud layer height and mud layer pressure mutual calculation method according to claim 1, characterized in that: h is mentioned Medicine for treating acute respiratory syndrome Is 3m.
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