Method for improving concentration efficiency of concentration tank and iron concentrate dewatering system

Abstract

The application discloses a method for improving the concentration efficiency of a concentration tank, and has the characteristics that it comprises the following steps: screening and adding reagents and calculating the adding amount: sampling the ore pulp in the concentration tank, measuring the settling rate of the sample; adding different reagents in the sample respectively, and measuring the settling rate respectively; adding different amounts of reagents in the sample respectively, and measuring the settling rate respectively; recording the reagent model used when the optimal settling rate is achieved and the final adding amount of the reagent; calculating the adding amount of the reagent of the concentration tank: measuring the ore input amount of the concentration tank, the area of the concentration tank and the particle size of the ore pulp; calculating the specific adding amount of the reagent of the concentration tank according to the screening and adding reagents and the calculation of the adding amount; and adding reagents: adding reagents at the ceramic machine overflow pipe entering the concentration tank according to the calculation of the adding amount of the reagent of the concentration tank. The application adds reagents in the concentration tank, makes the floating solid particles gather, accelerates the settling rate of the solid particles, increases the adsorption of the ceramic plate to the ore pulp, and improves the production capacity.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of iron concentrate dewatering, in particular to a method for improving the concentration efficiency of a concentration tank and an iron concentrate dewatering system. BACKGROUND

[0002] Since May 2019, in order to improve the concentrate grade and promote the production of "quality improvement and silicon reduction", the tower mill process has been added to the previous autogenous grinding and ball grinding process to improve the iron grade by grinding fineness. With the change of grinding process, the particle size of iron concentrate becomes finer, and the particle size grading of pipe conveying iron concentrate-325 mesh has increased from 73%-82% to 84%-95%. With the change of iron concentrate particle size grading, the solid particle impurities in the pulp increase, the concentration efficiency of the concentration tank decreases, and the overflow water quality deteriorates.

[0003] Therefore, there is an urgent need for a method for improving the concentration efficiency of the concentration tank, improving the overflow water quality of the concentration tank, improving the adaptability of the ceramic machine to fine particle size of the pulp, reducing the mixing phenomenon of the concentration tank, increasing the utilization rate of water resources in the station, improving the metal recovery rate of the iron concentrate dewatering, and effectively reducing the production cost. SUMMARY

[0004] The purpose of the present application is to provide a method for improving the concentration efficiency of the concentration tank, adding reagents in the concentration tank, and adding reagents to the surface of the concentration tank. The solid particles float and group with the addition of reagents, accelerate the settling rate of solid particles, calculate the type and amount of reagents added to the concentration tank through measurement and test, and inhibit the loss of water containing concentrate and solid particles.

[0005] The technical solution of the present application is as follows:

[0006] The present application discloses a method for improving the concentration efficiency of a concentration tank, comprising the following steps:

[0007] Screening and adding reagents and calculating the amount of reagents: sampling the pulp in the concentration tank, measuring the settling rate of the sample; adding different reagents to the sample respectively, and measuring the settling rate respectively; adding different amounts of reagents to the sample, and measuring the settling rate respectively; recording the type of reagent used and the final amount of reagent when the optimal settling rate is reached;

[0008] Calculating the amount of reagents added to the concentration tank: measuring the amount of ore entering the concentration tank, the area of the concentration tank, and the particle size of the pulp; according to the screening and adding reagents and calculating the amount of reagents, the specific amount of reagents added to the concentration tank is calculated;

[0009] Adding reagents: according to the calculation of the amount of reagents added to the concentration tank, adding reagents at the overflow pipe of the ceramic machine entering the concentration tank.

[0010] Further, the method for measuring the settling rate of the ore pulp sample in the thickening tank comprises the following steps:

[0011] Step one: sample the ore pulp and overflow water at the middle and edge overflow of the thickening tank, and measure and record the particle size state of the sample;

[0012] Step two: weigh 20g of the sample into a beaker, and add 50ml of distilled water;

[0013] Step three: place the beaker on a stirrer or stir manually, and stir at a rate of 350r / min;

[0014] Step four: quickly move the stirred sample into a 100ML settling bottle, and add a flocculating agent to make up to 100ML;

[0015] Step five: after the bottle cap is tightly closed, shake it evenly up and down;

[0016] Step six: place the settling bottle on a horizontal table and start timing, and record once every time the solid-liquid interface height decreases by 10ML;

[0017] Step seven: draw a settling curve graph, and record the settling rate according to the settling curve.

[0018] Further, the method for recording the settling rate according to the settling curve comprises the following steps:

[0019] S1: in the settling curve graph, draw a tangent line downward from the initial segment of the settling curve;

[0020] S2: draw a tangent line to the left of the curve after compression;

[0021] S3: the two tangent lines intersect at point R, draw an angle bisector of the angle formed by the two tangent lines, and the angle bisector intersects the settling curve at point P, which is the critical settling point for calculating the settling rate;

[0022] S4: draw a vertical line from point P to the horizontal coordinate axis, and the intersection point is the settling time t p , and draw a horizontal line to the vertical coordinate axis, and the intersection point is the settling height H p , then the settling rate of the corresponding point is v p =H p / t p .

[0023] Further, after adding the medicament, measure the turbidity of the overflow water in the thickening tank and visually observe the water quality, record the data changes, and adjust the medicament and the amount of medicament according to the water quality.

[0024] Further, the recorded data includes: visual observation of the water, the amount of medicament, the time of adding medicament, the settling time of the ore pulp, and the height of the water layer on the surface of the thickening tank.

[0025] The application discloses a kind of iron ore concentrate dehydration systems, including ceramic filter, 25 meters thickening tank and 12 meters thickening tank;Ceramic filter input end is connected high-level water tank and distribution barrel respectively, ceramic filter is connected 25 meters thickening tank by overflow pipe, 25 meters thickening tank is connected filtrate water pool, filtrate water pool is connected sewage pool, sewage pool is connected 12 meters thickening tank, 12 meters thickening tank is connected accident pool, accident pool is connected collection water pool, collection water pool is connected circulating water pool by heavy type filter, circulating water pool is connected to high-level water tank and water network respectively;Ceramic filter and overflow pipe on 25 meters thickening tank between connection reagent filling device, using the method for improving the concentration efficiency of thickening tank as claimed in claims 1-5.

[0026] Further, the 12 meters thickening tank is also connected to the 25 meters thickening tank by a 12 meters underflow pump;The water in the filtrate water pool is connected to the high-level water tank by a precision filter;The 25 meters thickening tank is also connected to the distribution barrel by a 25 meters underflow pump;The tank washing water in the collection water pool is connected to the ceramic filter.

[0027] Further, after the ceramic filter, the obtained tailings are transported to the stockyard, and the obtained concentrate enters the automobile receiving groove and is transported by automobile.

[0028] Further, the main pipeline is also connected to the 25 meters thickening tank;In the event of an accident, it is connected to the 12 meters thickening tank;When the concentration of the main pipeline is greater than 60%, it is connected to the distribution barrel.

[0029] Further, the reagent filling device comprises a reagent barrel, which is placed on a support;An electric stirring device is installed above the reagent barrel, the electric stirring device is connected to an electrical control box, and the electrical control box is configured with a stirring control electrical element circuit and a metering pump electrical control element circuit;A metering pump is also installed above the reagent barrel, the inlet pipe of the metering pump is placed in the reagent barrel, and the outlet pipe is connected to the reagent filling point.

[0030] As described above, due to the adoption of the above technical solutions, the application has the following advantages:

[0031] 1、The application improves the concentration efficiency of the thickening tank, and the surface floating solid particles of the thickening tank can be grouped with the addition of reagents, which can accelerate the settling rate of solid particles.

[0032] 2、In the application, the particle size grading of fine particle size slurry also changes after the grouping of reagents, which increases the adsorption of ceramic plates to slurry and improves production capacity.

[0033] 3、The application inhibits the loss of concentrate and solid particles in water.

[0034] 4、The application improves the overflow water quality, reduces the solid particle impurities in the water body inside the slurry, reduces the mixing phenomenon of the thickening tank, and improves the water quality.

[0035] 5、The application increases the utilization rate of water resources in the station, improves the metal recovery rate of iron concentrate dehydration, and effectively reduces the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0036] The application will be described by way of example and with reference to the accompanying drawings, in which:

[0037] Figure 1 is a flowchart of a method for improving the concentration efficiency of a concentration tank according to the application.

[0038] Figure 2 is a sedimentation curve diagram illustrating the method of recording the sedimentation rate according to the sedimentation curve in the embodiment.

[0039] Figure 3 is a structural diagram of an iron concentrate dehydration system according to the application. DETAILED DESCRIPTION

[0040] All features disclosed in this specification, and / or the steps of any method or process specified in this specification, can be combined in any combination, except combinations where at least some of the features and / or steps are mutually exclusive.

[0041] Any feature disclosed in this specification, unless stated otherwise, can be replaced by alternative features or equivalents having the same or a similar effect. That is, unless stated otherwise, each feature is one example only of a number of alternative or comparable features.

[0042] The features and properties of the application will be further described using the following examples, which do not limit the scope of the application.

[0043] As shown in Figure 1 , the application discloses a method for improving the concentration efficiency of a concentration tank, comprising the following steps:

[0044] Screening and adding reagents and calculating the amount of reagents to be added: sampling the ore pulp in the concentration tank, measuring the sedimentation rate of the sample; adding different reagents to the sample respectively, and measuring the sedimentation rate respectively; adding different amounts of reagents to the sample, and measuring the sedimentation rate respectively; recording the type of reagent used and the final amount of reagents added when the optimal sedimentation rate is achieved;

[0045] Calculating the amount of reagents to be added to the concentration tank: measuring the amount of ore entering the concentration tank, the area of the concentration tank, and the particle size of the ore pulp; calculating the specific amount of reagents to be added to the concentration tank according to the screening and adding reagents and the calculation of the amount of reagents to be added;

[0046] Adding reagents: adding reagents at the ceramic machine overflow pipe entering the concentration tank according to the calculation of the amount of reagents to be added to the concentration tank.

[0047] In the embodiment, the method for measuring the sedimentation rate of the ore pulp sample in the concentration tank comprises the following steps:

[0048] Step one: Respectively in the thickening tank, the edge of the overflow, the overflow water sampling, sample size state measurement record;

[0049] Step two: Weigh 20g sample to the beaker, add 50ml distilled water;

[0050] Step three: The beaker to the stirrer or manual stirring, stirring at 350r / min rate;

[0051] Step four: The stirring sample is quickly moved to the 100ML settling bottle, add flocculating agent and constant volume to 100ML;

[0052] Step five: After the bottle cover is good, with uniform speed up and down swing;

[0053] Step six: The settling bottle is placed on the horizontal table and the time is recorded. The height of the solid-liquid interface is recorded every 10ML.

[0054] Step seven: Draw the settling curve, and record the settling rate according to the settling curve.

[0055] As Figure 2 shown, the method of recording the settling rate according to the settling curve: draw a tangent line downward from the initial section of the settling curve, and draw a tangent line left from the compressed curve. The intersection of the two tangent lines is point R. The angle bisector of the angle formed by the two tangent lines intersects the settling curve at point P. P is the critical settling point for calculating the settling rate. The intersection of the vertical line drawn from point P to the horizontal coordinate axis is the settling time t p , and the intersection of the horizontal line with the vertical coordinate axis is the settling height H p . The corresponding point settling rate is v p =H p / t p .

[0056] The influence of different reagents on the settling rate and the influence of the actual reagent injection amount on the settling effect are analyzed and compared by drawing the curve according to the above method. Finally, the type of reagent used and the final reagent injection amount are determined.

[0057] Based on the above experiment, the actual injection amount is calculated to measure the thickening tank inlet ore quantity, thickening tank area, ore particle size and other parameters. The specific reagent injection amount is calculated based on the actual experimental data provided by the manufacturer.

[0058] According to the change of the ore pulp characteristics and the production capacity and the water quality of the thickening tank, the ore pulp particle size value is calculated, the turbidity of the overflow water of the thickening tank is measured by using a turbidimeter (plus the visual water quality), and the chemical agent is added under different particle sizes and water qualities, and after the chemical agent is fully mixed into the water body (the actual amount of the chemical agent is added), the water body of the thickening tank is monitored and observed, and the turbidity data of the water body before and after the addition of the chemical agent is recorded. The data record includes the visual water quality, the amount of the chemical agent, the addition time, the ore pulp settling time, the height of the water layer on the surface of the thickening tank and the like.

[0059] As shown in Figure 3 In one embodiment, a kind of iron ore concentrate dehydration system is disclosed, including ceramic filter, 25 meters thickening tank and 12 meters thickening tank;Ceramic filter input end is connected with high water tank and distribution barrel respectively, ceramic filter is connected with 25 meters thickening tank by overflow pipe, 25 meters thickening tank is connected with filtrate water pool, filtrate water pool is connected with sewage pool, sewage pool is connected with 12 meters thickening tank, 12 meters thickening tank is connected with accident pool, accident pool is connected with collection water pool, collection water pool is connected with circulating water pool by heavy type filter, circulating water pool is connected with high water tank and water network respectively;Chemical agent adding device is connected on overflow pipe between ceramic filter and 25 meters thickening tank;12 meters thickening tank is also connected with 25 meters thickening tank by 12 meters underflow pump;The water of filtrate water pool is connected with high water tank by precision filter;25 meters thickening tank is also connected with distribution barrel by 25 meters underflow pump;The tank washing water of collection water pool is to ceramic filter;After ceramic filter filters, the tailings obtained are transported to stockyard, and the concentrate obtained enters the car receiving slot and is transported by car;The ore pulp in main pipeline enters 25 meters thickening tank;In the accident state, enter 12 meters thickening tank;When the concentration of main pipeline is greater than 60%, enter distribution barrel.

[0060] Select the appropriate chemical agent injection point, install the chemical agent barrel with a volume of 1t, weld the chemical agent barrel mounting bracket, install the electric stirring device above the barrel mouth, install the electrical control box, configure the stirring control electrical element circuit and the metering pump electrical control element circuit in the control box, install the metering pump with a flow rate of 30-170L / h above the chemical agent barrel, place the pump inlet pipe in the chemical agent barrel, and connect the outlet pipe to the chemical agent injection point.

[0061] The present application measures, analyzes and calculates the relationship between the amount of chemical agent and the settling rate of fine particle size ore pulp in the thickening tank, reduces the loss of iron concentrate and solid particles in the overflow water of the thickening tank by adding chemical agent. Analyze the optimal amount of chemical agent for fine particle size ore pulp flocculation, optimize the particle size grading of the ore pulp, and improve the production capacity of the ceramic machine. The project takes the concentrate recovery of Yuxiangang station as the main research object, and improves the thickening efficiency of the thickening tank by adding chemical agent, which includes the selection of the chemical agent, the calculation of the amount of the chemical agent, the development of the chemical agent injection experiment, and finally achieves the goal of reducing the solid suspended matter by meeting the standard of the overflow water quality of the thickening tank, and realizes the goal of improving the production capacity through water quality treatment.

[0062] The above-described embodiments are merely illustrative of the present application, which is described in more detail and specifically, but should not be interpreted as a limitation on the scope of protection of the present application. It should be noted that for those skilled in the art, without departing from the technical concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. A method of improving the concentration efficiency of a concentration pond, characterized in that, The method comprises the following steps: Screening and adding reagents and calculating the amount of reagents: sampling the ore pulp in the concentration tank, measuring the settling rate of the sample; adding different reagents to the sample respectively, and measuring the settling rate respectively; adding different amounts of reagents to the sample, and measuring the settling rate respectively; recording the type of reagent used when the optimal settling rate is achieved and the final amount of reagents added; Calculating the amount of reagents added to the concentration tank: measuring the amount of ore entering the concentration tank, the area of the concentration tank, and the particle size of the ore pulp; According to the screening and adding reagents and the calculation of the amount of reagents, the specific amount of reagents added to the concentration tank is calculated; Adding reagents: according to the calculation of the amount of reagents added to the concentration tank, reagents are added at the overflow pipe of the ceramic filter entering the concentration tank.

2. The method of improving the concentration efficiency of a concentration pond according to claim 1, wherein, The method for measuring the settling rate of the ore pulp sample in the concentration tank comprises the following steps: Step 1: sampling the ore pulp and overflow water at the middle and edge overflow of the concentration tank, and measuring and recording the particle size of the sample; Step 2: weighing 20g of the sample and placing it in a beaker, and adding 50ml of distilled water; Step 3: placing the beaker on a stirrer or stirring manually at a speed of 350r / min; Step 4: quickly moving the stirred sample into a 100ML settling bottle, adding a flocculating agent, and then adding water to 100ML; Step 5: after the bottle cap is tightly closed, shake it evenly up and down; Step 6: place the settling bottle on a horizontal table and start timing, and record once every 10ML of the height of the solid-liquid interface; Step 7: draw a settling curve, and record the settling rate according to the settling curve.

3. The method of improving the concentration efficiency of a concentration pond according to claim 2, wherein, The method for recording the settling rate according to the settling curve comprises the following steps: S1: in the settling curve, draw a tangent line downward from the initial segment; S2: draw another tangent line to the left from the compressed curve; S3: the two tangent lines intersect at point R, and the angle bisector of the angle formed by the two tangent lines intersects point P on the settling curve, and P is the critical settling point for calculating the settling rate; S4: The intersection of the vertical line at P with the horizontal axis is the settling time t p The intersection of the horizontal line with the vertical axis is the settling height H p The settling rate of the corresponding point is v p = H p / t p .

4. The method of improving the concentration efficiency of a concentration pond according to claim 1, wherein, After adding reagents, measure the turbidity of the overflow water in the concentration tank and observe the water quality, record the data changes, and adjust the added reagents and the amount of reagents according to the water quality.

5. The method of improving the concentration efficiency of a concentration pond according to claim 4, wherein, The recorded data includes: water quality observation, amount of reagents added, time of reagents added, ore pulp settling time, and height of the water barrier on the surface of the concentration tank.

6. An iron ore concentrate dewatering system characterized by, The system comprises a ceramic filter, a 25-meter concentration tank, and a 12-meter concentration tank; the input end of the ceramic filter is connected to a high-level water tank and a distribution barrel, the ceramic filter is connected to the 25-meter concentration tank through an overflow pipe, the 25-meter concentration tank is connected to a filtrate tank, the filtrate tank is connected to a sewage tank, the sewage tank is connected to the 12-meter concentration tank, the 12-meter concentration tank is connected to an accident tank, the accident tank is connected to a collection tank, the collection tank is connected to a circulating water tank through a heavy filter, and the circulating water tank is connected to the high-level water tank and a water network; a reagent adding device is connected to the overflow pipe between the ceramic filter and the 25-meter concentration tank, and the method for improving the concentration efficiency of the concentration tank is used as claimed in any one of claims 1-5; The 12-meter concentration tank is also connected to the 25-meter concentration tank through a 12-meter underflow pump; the water in the filtrate tank is connected to the high-level water tank through a precision filter; the 25-meter concentration tank is also connected to the distribution barrel through a 25-meter underflow pump; the tank washing water in the collection tank is connected to the ceramic filter; After the ceramic filter filters, the tailings obtained are transported to the stockyard, and the concentrate obtained is transported to the automobile receiving groove by the automobile; It also includes: the ore pulp in the main pipeline enters the 25-meter thickening tank; in the accident state, it enters the 12-meter thickening tank; when the concentration of the main pipeline is greater than 60%, it enters the distribution barrel; The medicament filling device comprises a medicament barrel, which is placed on a support; an electric stirring device is installed above the medicament barrel; the electric stirring device is connected with an electric control box; the electric control box is configured with a stirring control electric element circuit and a metering pump electric control element circuit; a metering pump is also installed above the medicament barrel; the inlet pipe of the metering pump is placed in the medicament barrel, and the outlet pipe is connected to a medicament filling point.

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