CN116371579A - Control method for overflow concentration of hydrocyclone of ore grinding system - Google Patents
Control method for overflow concentration of hydrocyclone of ore grinding system Download PDFInfo
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- CN116371579A CN116371579A CN202310032883.3A CN202310032883A CN116371579A CN 116371579 A CN116371579 A CN 116371579A CN 202310032883 A CN202310032883 A CN 202310032883A CN 116371579 A CN116371579 A CN 116371579A
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- 238000000034 method Methods 0.000 title claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 98
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 238000005303 weighing Methods 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims description 21
- 239000002893 slag Substances 0.000 claims description 19
- 239000004576 sand Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 4
- 239000013049 sediment Substances 0.000 claims 1
- 239000000047 product Substances 0.000 description 15
- 238000007599 discharging Methods 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052964 arsenopyrite Inorganic materials 0.000 description 1
- MJLGNAGLHAQFHV-UHFFFAOYSA-N arsenopyrite Chemical compound [S-2].[Fe+3].[As-] MJLGNAGLHAQFHV-UHFFFAOYSA-N 0.000 description 1
- 229910052951 chalcopyrite Inorganic materials 0.000 description 1
- DVRDHUBQLOKMHZ-UHFFFAOYSA-N chalcopyrite Chemical compound [S-2].[S-2].[Fe+2].[Cu+2] DVRDHUBQLOKMHZ-UHFFFAOYSA-N 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 229910052683 pyrite Inorganic materials 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- 229910052952 pyrrhotite Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 229910052950 sphalerite Inorganic materials 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C25/00—Control arrangements specially adapted for crushing or disintegrating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C11/00—Accessories, e.g. safety or control devices, not otherwise provided for, e.g. regulators, valves in inlet or overflow ducting
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Food Science & Technology (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
Abstract
The application discloses a control method of overflow concentration of hydrocyclone of ore grinding system, comprising: the method comprises the steps of obtaining a weighing dry ore quantity entering an ore grinding system through a belt scale; according to the overflow concentration requirement value of the hydrocyclone, the total added water required by the ore grinding system is obtained by combining the weighing dry ore quantity calculation; distributing the total added water quantity to each adding point according to the proportion, and adding the water quantity to the ore grinding system; obtaining overflow concentration measurement values and flow values of the hydrocyclone, and calculating according to the overflow concentration measurement values and the flow values to obtain calculated dry ore quantity of the ore grinding system; and comparing the overflow concentration measured value with the overflow concentration required value, if the overflow concentration measured value is not matched with the overflow concentration required value, re-calculating the total added water quantity according to the calculated dry ore quantity, and performing proportional distribution until the overflow concentration required value is reached. The method calculates the total water quantity to implement control through a mass balance principle, forms closed control circulation, and can ensure high-efficiency and stable control of overflow concentration of the hydrocyclone.
Description
Technical Field
The invention belongs to the technical field of cyclones, and particularly relates to a control method for overflow concentration of a hydrocyclone of an ore grinding system.
Background
The ore grinding system consists of an ore feeding belt conveyor of an ore grinding machine, an ore grinding machine (a semi-autogenous mill and a ball mill), a screen (a semi-autogenous mill cylinder screen or a straight line screen and a ball mill cylinder screen), a slag slurry conveying pump and pump pool, a classifying system (a hydrocyclone) and a water supplementing system thereof, wherein the hydrocyclone is usually matched with the ball mill in the ore grinding system of an ore dressing plant and is used for controlling the fineness and concentration of an ore grinding final product, and the final product meeting the concentration requirement is obtained through classifying operation by overflow of the hydrocyclone. The ore grinding system mainly comprises two ore grinding systems, namely a semi-self-grinding process ore grinding system and a conventional ore grinding system according to different grinding processes. Whatever grinding system, there are two main methods for controlling the overflow concentration of the cyclone in the current actual production process: firstly, according to the production practical experience of an on-site hydrocyclone operator, the on-site concentration kettle is adopted for periodic sampling monitoring, and when the numerical value deviates to be high concentration or low concentration, a water adding valve is supplemented by manually adjusting a pump pool, so that the classification effect of the hydrocyclone is improved to control the overflow concentration of the hydrocyclone, and meanwhile, the overflow fineness of the hydrocyclone is also regulated and controlled; the second automatic control method, for example, the control principle in patent CN 111250277B, obtains the measured value on line in real time through the overflow concentration meter of the hydrocyclone, then determines according to the liquid level of the pump pool, combines the control target, adjusts and controls the rotation speed of the slurry pump, adjusts the feeding pressure of the hydrocyclone, thereby achieving the purposes of adjusting and controlling the concentration of the hydrocyclone, and usually also taking account of the overflow fineness of the hydrocyclone. The two methods have the following disadvantages:
(1) In the first method, the control difficulty is high by the experience of operators, so that the system frequently fluctuates and the system stability is poor;
(2) The first method has high labor intensity, particularly when the ore property is changed greatly, the overflow concentration of the cyclone fluctuates greatly, the index stability is difficult to ensure only by manpower, and the timely adjustment cannot be realized by the manpower;
(3) In the second method, the degree of automation is relatively high, and the labor intensity is reduced; however, the overflow concentration of the cyclone is controlled by the liquid level of the pump pool, the rotation speed of the pump and the pressure of the hydrocyclone, and the defects of large concentration fluctuation, instability and great control difficulty exist;
(4) In the second method, when the properties of the ore fluctuate greatly, in order to ensure the fineness and concentration of the ground ore product to be stable and mutually matched, the system is possibly frequently adjusted, the concentration value fluctuates continuously, and the stable value cannot be reached quickly.
(5) The first method has high labor cost, and the daily management process of operators is required to be continuously participated; the second method is frequent in adjustment and large in fluctuation, and quick-wear parts of equipment such as a sand settling port of the cyclone, an impeller of a slurry pump and the like are accelerated to wear, so that the cost is increased;
(6) The first method has slow and inaccurate manual reaction speed adjustment; the second method has high reaction speed, but the difficulty of realizing the overflow stabilization of the final hydrocyclone to be a fixed value is high;
(7) The second method needs to cooperate with the control of the liquid level of the pump pool, the control logic is complex, the control logic is influenced by multiple factors such as the liquid level of the pump pool, the rotation speed of the pump, the pressure of the hydrocyclone and the like, the overflow of the whole hydrocyclone is in a dynamic balance state, and the system is relatively complex and is not easy to stabilize.
Disclosure of Invention
In order to solve the above problems, the present application discloses a control method for overflow concentration of hydrocyclone in ore grinding system, comprising:
s10, obtaining the weighing dry ore quantity entering an ore grinding system through a belt scale on a belt conveyor;
step S20, according to the overflow concentration requirement value of the hydrocyclone, the total added water required by the ore grinding system is obtained by combining the weighed dry ore quantity calculation;
step S30, distributing the total added water quantity to each adding point according to a proportion, and adding the water quantity to the ore grinding system;
s40, obtaining overflow concentration measurement values and flow values of the hydrocyclone, and calculating according to the overflow concentration measurement values and the flow values to obtain calculated dry ore quantity of the ore grinding system;
and S50, comparing the overflow concentration measured value with an overflow concentration required value, if the overflow concentration measured value is not matched with the overflow concentration required value, re-calculating the total added water quantity according to the calculated dry ore quantity, and returning to the step S30 until the overflow concentration required value is reached.
Optionally, the total added water is calculated according to the following formula:
overflow concentration demand = dry ore quantity/(dry ore quantity + total added water quantity).
Optionally, in the semi-autogenous grinding process grinding system, materials are fed into a semi-autogenous mill through a belt conveyor to grind, water supply is added into the semi-autogenous mill through a first adding point S1, ground ore products of the semi-autogenous mill are discharged to a semi-autogenous mill discharge screen to be screened, the water supply returns to the belt conveyor after screening, the water flows automatically to a hydrocyclone feed slag slurry pump pool through a second adding point S2, the water supply is added into the semi-autogenous mill discharge screen and the hydrocyclone feed slag slurry pump pool, ore pulp in the hydrocyclone feed slag slurry pump pool is conveyed to the hydrocyclone to be graded, settled sand of the hydrocyclone enters a ball mill to grind, the ground ore of the ball mill is discharged to the hydrocyclone feed slurry pump pool, overflow of the hydrocyclone is detected by a concentration meter and a flowmeter and then subjected to sorting operation, the water supply is added to a hydrocyclone sand tank through a third adding point S3, and the total added water amount is the sum of the added water amounts of S1, S2 and S3.
Optionally, the water supply ratio of S1, S2 and S3 is s1:s2:s3=10:2:1.
Optionally, in the conventional ore grinding system, materials are fed into a ball mill through a belt conveyor to grind, water is fed into the ball mill through a fourth adding point S4, the ground ore products of the ball mill are discharged into an ore discharging end and a pump pool of the ball mill, water is fed into the ore discharging end and the pump pool of the ball mill through a fifth adding point S5, a hydrocyclone supplies ore pulp to a slag pulp pump to convey ore pulp from the ore discharging end and the pump pool of the ball mill to a hydrocyclone set for classification, settled sand of the hydrocyclone set returns to the ball mill to grind, the ground ore is discharged into the ore discharging end and the pump pool of the ball mill, overflow of the hydrocyclone is detected by a concentration meter and a flowmeter to a sorting operation, and the total added water amount is the sum of the added water amount of the fourth adding point S4 and the fifth adding point S5.
Optionally, the water supply ratio of S4 and S5 is S4:S5=1 (5-8).
Optionally, each of the adding points is set as a parallel water supply pipeline, and one branch of the parallel water supply pipeline is a standby pipeline.
Optionally, the calculating the calculated dry ore quantity of the ore grinding system according to the overflow concentration measured value and the flow value refers to obtaining the calculated dry ore quantity by multiplying the flow by the overflow concentration.
The application has the following technical effects:
(1) The control method is strong in systematicness, solves the overflow concentration problem by controlling the whole system from a macroscopic angle, is not limited by the specific operation parameter change in the system, is proved to be very effective by production embodiments, and can ensure that the overflow concentration of the hydrocyclone is controlled efficiently and stably.
(2) And calculating the total water quantity to control according to the overflow concentration control target through a mass balance principle, detecting, checking and feeding back the overflow concentration to form a closed control loop, continuously iterating and adjusting the total added water quantity, and finally ensuring the control to be accurate and effective.
(3) When the product fineness control logic is executed, the overflow concentration of the hydrocyclone product can be stably controlled and unchanged as long as the total water quantity of the grinding system is kept unchanged, and the hydrocyclone product fineness control logic can be better compatible with other control logic. For example: in order to ensure that the liquid level of the pump pool is in a reasonable range, the water is required to be added to the pump pool to increase the water quantity instantaneously, under the condition that the overflow concentration of the hydrocyclone is kept unchanged, the water quantity of S2 added points is increased, and the water quantity of S1 and S3 is reduced according to an adjustment rule, so that the total water quantity is ensured not to be changed to stabilize the overflow concentration.
(4) Can realize automatic control and greatly reduce the labor intensity of operators.
(5) The adaptability is strong, the fluctuation of ore properties can cause the fluctuation of the fineness of the product, but the control is implemented by using the logic of the total water quantity, so that the influence of the fineness of the product on the concentration is well eliminated, and the stable and controllable overflow concentration of the cyclone is ensured.
Drawings
Fig. 1 is a schematic diagram of a semi-autogenous grinding process grinding system according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a conventional grinding system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The control method of the overflow concentration of the hydrocyclone of the ore grinding system in this embodiment is based on the principle of mass balance of the system, and the dry ore quantity and the total water quantity entering the ore grinding system are equal to the dry ore quantity and the total water quantity discharged from the ore grinding system, so that the overflow concentration=dry ore quantity/(dry ore quantity+total water quantity) of the hydrocyclone of the ore grinding system. The total water quantity of the ore grinding system of the semi-autogenous grinding process consists of raw ore feed water, semi-autogenous mill ore discharge and pump sump feed water and hydrocyclone sand setting feed water; the general ore grinding system has total water amount comprising raw ore water supply, ball mill ore discharge and pump pond water supply. According to the method, the total added water quantity is calculated and obtained according to the concentration requirement of overflow (grinding products) of the hydrocyclone in the follow-up sorting operation or flow and based on the measured quantity of belt scales of the ore feeding belt conveyor, and is distributed to each adding point according to a fixed proportion; and then checking the concentration through a cyclone overflow pipe concentration meter, checking the dry ore quantity of the ore feeding belt conveyor through the concentration meter and a flowmeter, and performing intelligent adjustment according to the checking difference value to finally ensure that the overflow concentration of the hydrocyclone reaches a set target.
The control method of the overflow concentration of the hydrocyclone of the ore grinding system comprises the following steps:
s10, obtaining the dry ore weighing quantity which enters an ore grinding system through a belt scale 2 on a belt conveyor 1, wherein the dry ore weighing quantity is expressed by t/h, and the water content of the dry ore weighing quantity is usually 3% -5% of a fixed value;
and S20, calculating to obtain the total added water quantity required by the ore grinding system according to the concentration requirement of the hydrocyclone, namely the overflow concentration requirement value, for example, the overflow concentration requirement value required by a certain copper mine hydrocyclone is between 30% and 35%, of the subsequent sorting operation and the weighed dry ore quantity obtained by the belt scale 2 in the step S10.
Specifically, the total added water amount may be calculated from the overflow concentration demand value=the dry ore amount/(the dry ore amount+the total added water amount).
And step S30, distributing the total added water quantity to each adding point according to the proportion to add the water quantity.
For example, the semi-autogenous grinding process grinding system shown in fig. 1, the semi-autogenous grinding process grinding system comprises a belt conveyor 1, a belt balance 2 of the belt conveyor, a return belt conveyor 3, a semi-autogenous mill 4, a semi-autogenous mill discharge screen 5, a cyclone feed slag slurry pump tank 6, a cyclone feed slag slurry pump 7, a ball mill 8, a hydrocyclone set 9, a hydrocyclone overflow concentration meter and a flowmeter 10.
The material of ore grinding return circuit is carried into and grinds ore in the semi-autogenous mill 4 through belt conveyor 1, simultaneously external water supply adds to in the semi-autogenous mill 4 through first interpolation point S1, guarantee to get into the ore grinding concentration of semi-autogenous mill 4, semi-autogenous mill 4 grinds ore product discharge and sieves through semi-autogenous mill ore discharge sieve 5, return belt conveyor 3 direct return semi-autogenous mill 4 on the sieve, the sieve flows automatically to hydrocyclone give slag slurry pump pond 6, in order to guarantee screening efficiency and follow-up pump transport needs, set up second interpolation point S2 for slag slurry pump pond 6 at semi-autogenous mill ore discharge sieve 5 and swirler, the water supply of second interpolation point S2 gets into in semi-autogenous mill ore discharge sieve 5 and the swirler gives slag slurry pump pond 6. The hydrocyclone feeding slag slurry pump 7 conveys ore pulp in the hydrocyclone feeding slag slurry pump pool 6 to the hydrocyclone 9 for classification, sand setting of the hydrocyclone 9 enters the ball mill 8 for grinding, grinding and ore discharging of the ball mill 8 are carried out to the hydrocyclone feeding slag slurry pump pool 6, and overflow of the hydrocyclone 9 is detected by the concentration meter and the flowmeter 10 and then subjected to sorting operation. In order to control the grinding concentration of the ball mill, water is added from a third addition point S3 to the sand settling tank of the hydrocyclone 9. The total added water quantity is composed of the sum of the water quantities of the three adding points S1, S2 and S3. For example, s1:s2:s3=10:2:1 is allocated to each addition point and added.
Preferably, the first to third adding points are all provided with parallel water supply pipelines, one branch in the parallel water supply pipelines is a standby pipeline, and when the regulating valve on one branch has a problem and needs to be maintained and replaced, the other branch is used for working, so that the production is not influenced. As in fig. 1, there are branches S11, S21, S31, respectively, in which control valve groups are installed to regulate the amount of water supplied.
For example, the conventional ore grinding system of fig. 2 includes an ore feed belt conveyor 1, a belt scale 2, a ball mill 8, a ball mill discharge end and a pump sump 4 (the discharge end sometimes being fitted with a cylindrical screen), a cyclone feed slurry pump 7, a hydrocyclone bank 9, a hydrocyclone overflow concentration meter and a flowmeter 10.
The material of the ore grinding loop is conveyed into the ball mill 8 through the belt conveyor 1 to grind, meanwhile, external water supply is added into the ball mill 8 through the fourth adding point S4, so that the ore grinding concentration of the ball mill 8 is guaranteed, the ore grinding product of the ball mill is discharged into the ore discharging end of the ball mill and the pump pool 4, and a fifth adding point S5 is arranged at the ore discharging end of the ball mill and the pump pool 4 for guaranteeing the screening efficiency of the screen at the ore discharging end and the requirement of subsequent pump conveying. The hydrocyclone conveys ore pulp to a hydrocyclone group 9 for classification from a ball mill ore discharge end and a pump pool 4 for a slag pulp pump 7, settled sand of the hydrocyclone group 9 is returned to a ball mill 8 for ore grinding, ore grinding and ore discharge are carried out to the ball mill ore discharge end and the pump pool 4, and hydrocyclone overflow is detected by a hydrocyclone overflow concentration meter and a flowmeter 10 and then subjected to sorting operation. The total added water quantity is composed of the sum of the added water quantity of the fourth adding point S4 and the added water quantity of the fifth adding point S5.
Preferably, the total added water is added in proportion, usually s4:s5=1 (5 to 8) to each addition point.
Preferably, the fourth to fifth adding points are all provided with parallel water supply pipelines, one branch in the parallel water supply pipelines is a standby pipeline, and when the regulating valve on one branch has a problem and needs to be maintained and replaced, the other branch is used for working, so that the production is not influenced. As in fig. 2, there are branches S41, S51, respectively, in which control valve groups are installed to regulate the amount of water supplied.
Step S40, obtaining overflow concentration measurement value and flow rate by the hydrocyclone overflow concentration meter and the flowmeter 10 respectively, and calculating according to the flow rate and the overflow concentration measurement value to obtain calculated dry ore quantity of the ore grinding system, specifically, obtaining calculated dry ore quantity by multiplying the flow rate by the overflow concentration measurement value.
And S50, comparing the overflow concentration measured value with the overflow concentration required value, if the overflow concentration measured value is not matched with the overflow concentration required value, calculating the dry ore quantity, recalculating the total added water quantity according to the overflow concentration required value=dry ore quantity/(dry ore quantity+total added water quantity), and returning to the step S30 until the overflow concentration required value is reached.
For example, the overflow concentration measured value of the hydrocyclone is 32% by reading, and the calculated dry ore quantity of the ore grinding system is 390t/h by calculating the value of the combined flowmeter. Comparing the calculated dry ore quantity with the weighed dry ore quantity 385t/h of the belt scale 2, it is apparent that the dry ore quantity overflowed from the cyclone is increased. Since the total addition water amount calculated in the foregoing was obtained by calculation with the weighed dry ore amount by the belt scale 2, it was not accurate enough, and thus the total addition water amount was recalculated based on the calculated dry ore amount of 390t/h and distributed to each addition point in proportion, with the calculated dry ore amount of 390t/h as the basis for the total addition water amount, the read concentration was 32%, and the required overflow concentration was 30%, and the overflow concentration measured value was higher than the overflow concentration required value. Similarly, if the overflow concentration measured value is lower than the overflow concentration required value, the total added water amount may be recalculated based on the calculated dry ore amount and distributed to each addition point in proportion.
It should be noted that, in this embodiment, the system control is emphasized, the adding points may not be limited to the above 2 points and 3 points, and may be more, and the adding points may be properly selected according to the actual needs of the grinding system, but the overall control effect is not affected.
Taking a grinding system of a multi-metal ore dressing plant in Yunnan as an example, the grinding system is a semi-self-grinding process and is formed according to a system shown in figure 1. The treated ore is multi-metal ore, the treating capacity is 8000t/d, the treated mineral comprises sphalerite, pyrrhotite, pyrite, magnetite, cassiterite, chalcopyrite, arsenopyrite and the like, and the hardness coefficient of the ore is 1-7. The embodiment has the remarkable characteristics of complex mineral composition of ores, large fluctuation of hardness of the ores, large difference of grindability and the like. The grinding process adopts SAB process, the fineness of the grinding final product is-0.074 mm and is 69% -71%, and the product concentration is 39% -41%. The control method of the embodiment is adopted to control the total water quantity of the overflow of the hydrocyclone. By comparing manual control operation with automatic adjustment and operation of the embodiment, continuous production practice proves that the concentration qualification rate of the ground ore product is 98.75%, and the concentration qualification rate of the ground ore product is 94.17% in the manual operation mode, and is improved by 4.58% compared with that in the manual operation mode. In the execution process of the control method of the embodiment, the overflow concentration of the hydrocyclone can be accurately controlled within the range of the sorting operation requirement for a long time (98 percent of time), the effect is remarkable, the labor intensity of operators is greatly reduced, unmanned control of the overflow concentration of the hydrocyclone is realized, and the operation control is accurately and stably carried out. The overflow concentration of the hydrocyclone can be controlled efficiently, the concentration of the subsequent sorting operation is stabilized, the reagent consumption of the sorting operation is greatly reduced, and compared with the reagent consumption of pulp fluctuation caused by manually controlling the overflow of the hydrocyclone, the reagent consumption is saved by 3% -5%, and the grade and recovery rate of the product are more stable.
Of course, the present invention is capable of other various embodiments and its several details are capable of modification in accordance with the present invention by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The control method of the overflow concentration of the hydrocyclone of the ore grinding system is characterized by comprising the following steps:
s10, obtaining the weighing dry ore quantity entering an ore grinding system through a belt scale on a belt conveyor;
step S20, according to the overflow concentration requirement value of the hydrocyclone, the total added water required by the ore grinding system is obtained by combining the weighed dry ore quantity calculation;
step S30, distributing the total added water quantity to each adding point according to a proportion, and adding the water quantity to the ore grinding system;
s40, obtaining overflow concentration measurement values and flow values of the hydrocyclone, and calculating according to the overflow concentration measurement values and the flow values to obtain calculated dry ore quantity of the ore grinding system;
and S50, comparing the overflow concentration measured value with an overflow concentration required value, if the overflow concentration measured value is not matched with the overflow concentration required value, re-calculating the total added water quantity according to the calculated dry ore quantity, and returning to the step S30 until the overflow concentration required value is reached.
2. The method for controlling overflow concentration of hydrocyclone in ore grinding system according to claim 1, wherein the calculated total added water amount is calculated according to the following formula:
overflow concentration demand = dry ore quantity/(dry ore quantity + total added water quantity).
3. The method for controlling overflow concentration of hydrocyclone in ore grinding system according to claim 1, wherein,
in the semi-autogenous grinding process grinding system, materials are fed into a semi-autogenous mill through a belt conveyor to grind, water is added into the semi-autogenous mill through a first adding point S1, ground ore products of the semi-autogenous mill are discharged to a semi-autogenous mill discharge screen to be screened, the water returns to the belt conveyor after screening, the water flows automatically to a hydrocyclone feed slag slurry pump pool under the screen, the water is added into the semi-autogenous mill discharge screen and a hydrocyclone feed slag slurry pump pool through a second adding point S2, the hydrocyclone feed slag slurry pump conveys ore pulp in the hydrocyclone feed slag slurry pump pool to the hydrocyclone to be graded, sand of the hydrocyclone enters a ball mill to grind, the ground ore of the ball mill is discharged to the hydrocyclone feed slurry pump pool, overflow of the hydrocyclone is detected by a concentration meter and a flow meter and then subjected to sorting operation, the water is added to a hydrocyclone sand basin through a third adding point S3, and the total adding water amount is the sum of the water amounts of S1, S2 and S3.
4. A method of controlling the overflow concentration of a hydrocyclone in a grinding system according to claim 3, wherein the water supply ratio of S1, S2 and S3 is s1:s2:s3=10:2:1.
5. The method for controlling overflow concentration of hydrocyclone in ore grinding system according to claim 1, wherein in conventional ore grinding system, the material is fed into ball mill for grinding by belt conveyor, water is added into ball mill by fourth adding point S4, ball mill grinding product is discharged into ball mill discharge end and pump pool, water is added into ball mill discharge end and pump pool by fifth adding point S5, hydrocyclone conveys ore pulp from ball mill discharge end and pump pool to hydrocyclone group for classification by slag pulp pump, sand sediment of hydrocyclone group is returned into ball mill grinding, grinding is discharged into ball mill discharge end and pump pool, overflow of hydrocyclone is detected by concentration meter and flowmeter to sorting operation, total adding water is sum of fourth adding point S4 and fifth adding point S5 adding point water quantity.
6. The method of controlling overflow concentration of hydrocyclone in ore grinding system according to claim 5, wherein the water supply ratio of S4 and S5 is S4:S5=1 (5-8).
7. The method of controlling overflow concentration of hydrocyclone in ore grinding system according to claim 1, wherein each of the adding points is set as a parallel water supply line, and one branch of the parallel water supply line is a backup line.
8. The method for controlling overflow concentration of hydrocyclone in ore grinding system according to claim 1, wherein the calculating the calculated dry ore amount in the ore grinding system according to the overflow concentration measurement value and the flow value is to obtain the calculated dry ore amount by multiplying the flow value by the overflow concentration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310032883.3A CN116371579A (en) | 2023-01-10 | 2023-01-10 | Control method for overflow concentration of hydrocyclone of ore grinding system |
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| CN202310032883.3A CN116371579A (en) | 2023-01-10 | 2023-01-10 | Control method for overflow concentration of hydrocyclone of ore grinding system |
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