Method for measuring content of water-soluble lead

Abstract

The invention discloses a method for determining the content of water-soluble lead, which comprises the following steps: sample treatment: filtering: to-be-detected mine gushing water is conveyed into a settling tank through a water inlet pipe, and a filter screen arranged in the water inlet pipe is used for filtering the mine gushing water to remove large-particle impurities in the mine gushing water; settling: standing the filtered mine gushing water in a settling tank, so that small-particle impurities and the like which are not filtered in the mine gushing water are settled to the bottom of the settling tank; performing dispersion; before sampling, the sample is filtered and precipitated in sequence through the sample treatment step, large-particle impurities and small-particle impurities in the mine gushing water are removed, the influence of various impurities, especially insoluble lead, in the mine gushing water sample on the determination of the content of water-soluble lead can be avoided, the accuracy of a detection result is improved, and the accuracy of the detection result is improved. Meanwhile, the water-soluble lead in the mine gushing water is uniformly distributed through the dispersing step, and then the water-soluble lead is sampled, so that the accuracy of a detection result can be further improved.

Description

Technical Field

[0001] The invention relates to the technical field of mine water inrush detection, in particular to a method for determining water-soluble lead content. Background Art

[0002] Affected by geological mineralization and mining engineering, the heavy metal Pb content in mine water in the lead-zinc polymetallic mining area in western Henan is relatively high. It mainly exists in particulate form, has high activity, can participate in various chemical reactions, and has different chemical stability and toxicity. As the water environment changes, its morphology will also change, but the toxicity will not be lost with structural changes. Reservoirs with drinking water functions are widely distributed in the lead-zinc mining area in western Henan (especially downstream of mine water). If the lead content in the water cannot be effectively controlled, mine water will pollute reservoirs or groundwater with drinking water functions. Therefore, the total lead and water-soluble content in lead-zinc polymetallic mine water are water environment indicators that need to be closely monitored. Most of the existing methods for determining water-soluble lead content are not suitable for the detection of mine water. Mine water has complex components and contains particles of different sizes. Direct sampling and detection will affect the accuracy of the test results. To this end, we propose a method for determining water-soluble lead content. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a method for determining the water-soluble lead content. Before sampling, the sample is filtered and precipitated in sequence through the sample processing steps to remove large and small particle impurities in the mine water. This can avoid the influence of various impurities in the mine water sample, especially insoluble lead, on the determination of the water-soluble lead content, thereby improving the accuracy of the detection result and effectively solving the problems in the background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a method for determining water-soluble lead content, comprising the following steps: Sample processing: Sample processing includes the following steps: Filtration: The mine water to be tested is transported to the sedimentation box through the water inlet pipe. The filter net installed in the water inlet pipe is used to filter the mine water and remove large particles of impurities; Sedimentation: The filtered mine water is left to stand in the sedimentation tank, so that the unfiltered small particles of impurities in the mine water are settled to the bottom of the sedimentation tank; Dispersion: After sedimentation, the mine water is sent to the dispersion barrel through the drainage pipe installed on the sedimentation tank, and is fully dispersed by the dispersion mechanism in the dispersion barrel; Sampling: The dispersed mine water is discharged through the sampling tube provided on the dispersion barrel. Assay: The assay consists of the following steps: Atomization: The treated sample water sample is atomized and sent into a graphite furnace for heating to atomize the lead; Absorption measurement: Use a light source of a specific wavelength to irradiate the sample and detect the degree of light absorption by the sample. Determine the lead content in the sample based on the measured absorbance and reference to a pre-established standard curve.

[0005] As a preferred technical solution of the present invention, a sealing ring is rotatably arranged inside the water inlet pipe in the filtering step, the filter screen is arranged on the inner surface of the sealing ring, and two rotating shafts are symmetrically arranged on the sealing ring, one of the rotating shafts is rotatably arranged in a groove opened on the inner side of the water inlet pipe, and the top end of the other rotating shaft passes through the outer surface of the water inlet pipe and is connected to the rotating handle.

[0006] As a preferred technical solution of the present invention, the drainage pipe in the dispersion step includes several drainage branch pipes and a drainage main pipe, and the several drainage branch pipes are evenly installed on the outer surface of the sedimentation tank from top to bottom, and the ends of the several drainage branch pipes are connected in parallel with the drainage main pipe through vertical pipes.

[0007] As a preferred technical solution of the present invention, a branch pipe solenoid valve is installed on each of the drainage branch pipes.

[0008] As a preferred technical solution of the present invention, a static mixing tube is installed on the main drainage pipe, and a static mixer is installed in the static mixing tube.

[0009] As a preferred technical solution of the present invention, a sedimentation discharge pipe is provided on the lower surface of the sedimentation box, and a valve is installed on the sedimentation discharge pipe.

[0010] As a preferred technical solution of the present invention, a hydraulic cylinder is installed at the center of the upper surface of the sedimentation box, the movable end of the hydraulic cylinder penetrates into the sedimentation box, and a number of connecting rods are evenly arranged on the circumferential surface of the bottom end of the movable end of the hydraulic cylinder, a rubber ring is fixedly arranged at the bottom end of the connecting rod, and a filter membrane is arranged on the inner side of the rubber ring.

[0011] As a preferred technical solution of the present invention, a driving motor is installed at the center of the upper surface of the dispersion barrel in the dispersion step, the output shaft of the driving motor penetrates into the dispersion barrel and is connected to the stirring shaft through a coupling, and several groups of stirring blades are evenly arranged on the outer peripheral side surface of the stirring shaft.

[0012] As a preferred technical solution of the present invention, a plurality of sampling tubes are provided in the sampling step, and the plurality of sampling tubes are evenly arranged on the outer surface of the dispersion barrel from top to bottom, and the lengths of the plurality of sampling tubes are shortened from top to bottom, and each sampling tube is equipped with a sampling tube solenoid valve.

[0013] As a preferred technical solution of the present invention, a transparent observation window is provided on the side surface of the sedimentation box, and scale lines are evenly provided on the side surface of the observation window.

[0014] Compared with the prior art, the present invention has the following beneficial effects: before sampling, the sample is filtered and precipitated in sequence through the sample processing step to remove large and small particle impurities in the mine water, thereby avoiding the influence of various impurities in the mine water sample, especially insoluble lead, on the determination of water-soluble lead content, thereby improving the accuracy of the detection result; at the same time, the water-soluble lead in the mine water is evenly distributed through the dispersion step, and then sampling is performed, thereby further improving the accuracy of the detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the method steps of the present invention; Figure 2 It is a schematic diagram of the structure of the device used in the sample processing step of the present invention; Figure 3 For the present invention Figure 2 A side view schematic diagram of the structure; Figure 4 It is a structural schematic diagram of a sedimentation box in the sample processing step of the present invention; Figure 5 It is a schematic diagram of the structure of the filter screen in the sample processing step of the present invention.

[0016] In the figure: 1 sedimentation box, 2 columns, 3 water inlet pipe, 4 rotating handle, 5 rotating shaft, 6 sealing ring, 7 filter screen, 8 drainage branch pipe, 9 branch solenoid valve, 10 drainage main pipe, 11 static mixing pipe, 12 dispersion barrel, 13 sedimentation discharge pipe, 14 valve, 15 hydraulic cylinder, 16 connecting rod, 17 filter membrane, 18 driving motor, 19 stirring shaft, 20 stirring blade, 21 sampling tube, 22 sampling tube solenoid valve, 23 observation window, 24 scale line. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-5 The present invention provides a technical solution: a method for determining water-soluble lead content, comprising the following steps: Sample processing: Sample processing includes the following steps: Filtration: The mine water to be detected is transported to the sedimentation box 1 through the water inlet pipe 3. A plurality of columns 2 are evenly arranged on the lower surface of the sedimentation box 1. The filter screen 7 arranged in the water inlet pipe 3 is used to filter the mine water and remove large particles of impurities therein; Sedimentation: The filtered mine water is left to stand in the sedimentation tank 1, so that the unfiltered small particles of impurities in the mine water are precipitated to the bottom of the sedimentation tank 1. Before sampling, the sample is filtered and precipitated in turn through the sample processing steps to remove large and small particles of impurities in the mine water. This can avoid the influence of various impurities in the mine water sample, especially insoluble lead, on the determination of water-soluble lead content, thereby improving the accuracy of the test results.

[0019] Dispersion: After sedimentation, the mine water is sent to the dispersion barrel 12 through the drainage pipe provided on the sedimentation tank 1, and is fully dispersed by the dispersion mechanism in the dispersion barrel 12; Sampling: The dispersed mine water is discharged through the sampling tube 21 provided on the dispersion barrel 12 to discharge the dispersed mine water sample. After the dispersion step, the water-soluble lead in the mine water is evenly distributed, and then sampling is performed, which can further improve the accuracy of the detection result.

[0020] Assay: The assay consists of the following steps: Atomization: The treated sample water sample is atomized and sent into a graphite furnace for heating to atomize the lead; Absorption measurement: Use a light source of a specific wavelength to irradiate the sample and detect the degree of light absorption by the sample. Determine the lead content in the sample based on the measured absorbance and reference to a pre-established standard curve.

[0021] Specifically, based on the measured absorbance, the obtained data is compared with a standard solution of known concentration to establish a calibration curve, and the concentration of water-soluble lead in the unknown sample can be calculated using the calibration curve.

[0022] The preferred technical solution is that the lower part of the sedimentation box 1 is a cone with a larger upper part and a smaller lower part, and a sedimentation discharge pipe 13 is provided at the center of the lower surface of the sedimentation box 1, which is used to discharge small particles of impurities precipitated by the mine water, especially insoluble lead; a valve 14 is installed on the sedimentation discharge pipe 13, and the valve 14 can be selected as a commonly used electric valve or a manual valve, which is used to control the switch of the sedimentation discharge pipe 13.

[0023] According to the preferred technical solution, a sealing ring 6 is rotatably arranged inside the water inlet pipe 3 in the filtering step, and a filter screen 7 is arranged on the inner surface of the sealing ring 6, and large particles of impurities in the mine water are filtered through the filter screen 7; two rotating shafts 5 are symmetrically arranged on the sealing ring 6, one of which is rotatably arranged in a groove opened on the inner side of the water inlet pipe 3, and the top of the other rotating shaft 5 passes through the outer surface of the water inlet pipe 3 and is connected to the rotating handle 4, and a rotating sealing ring is arranged between the rotating shaft 5 and the water inlet pipe 3, and the rotating handle 4 can drive the rotating shaft 5, the sealing ring 6 and the filter screen 7 to rotate. When the filter screen 7 needs to be cleaned, it can be driven to rotate 180° by rotating the handle 4, and the solenoid valve on the drain pipe is closed, and then the valve 14 is opened, and cleaning water is introduced into the water inlet pipe 3, so that large particles of impurities accumulated on the filter screen 7 can be discharged through the sedimentation discharge pipe 13, which is convenient to clean and simple to operate.

[0024] Optionally, positioning holes are provided on the side surface of the rotating handle 4 and the outer surface of the water inlet pipe 3, and positioning rods are installed in the positioning holes to fix the position of the rotating handle 4, thereby fixing the sealing ring 6 and the filter screen 7 to ensure the stability of the filter screen 7 during the processing of mine water samples.

[0025] Further optionally, an inner side of the positioning hole on the water inlet pipe 3 is provided with an internal thread, and an end of the positioning rod is provided with an external thread corresponding thereto, and the positioning rod is fixed by the thread to improve stability.

[0026] According to the preferred technical solution, the drainage pipes in the dispersion step include several drainage branch pipes 8 and a drainage main pipe 10. The several drainage branch pipes 8 are evenly installed on the outer surface of the sedimentation tank 1 from top to bottom, and the ends of the several drainage branch pipes 8 are connected in parallel with the drainage main pipe 10 through vertical pipes. A branch solenoid valve 9 is installed on each drainage branch pipe 8. Before the mine water after static sedimentation is discharged into the dispersion barrel 12 through the drainage pipe, the branch solenoid valve 9 on the drainage branch pipe 8 at the corresponding height can be opened according to the specific height of the sediment, so as to discharge the mine water above the sediment and prevent small particles of sediment from entering the dispersion barrel 12 and affecting the accuracy of the detection result.

[0027] Further preferably, a transparent observation window 23 is provided on the side surface of the sedimentation box 1, and scale lines 24 are evenly provided on the side surface of the observation window 23. The staff can clearly check the height of the sediment through the observation window 23 and the scale lines 24, and then determine the branch solenoid valve 9 that needs to be opened, so that the operation is more accurate.

[0028] Furthermore, a hydraulic cylinder 15 is installed at the center of the upper surface of the sedimentation box 1, and the movable end of the hydraulic cylinder 15 penetrates the sedimentation box 1, and a plurality of connecting rods 16 are evenly arranged on the peripheral surface of the bottom end of the movable end of the hydraulic cylinder 15. A rubber ring is fixedly arranged at the bottom end of the connecting rod 16, and a filter membrane 17 is arranged on the inner side of the rubber ring. After the sediment in the sedimentation box 1 is settled, the staff observes the height of the sediment and controls the hydraulic cylinder 15 to drive the rubber ring and the filter membrane 17 to slowly descend through the connecting rod 16, so that the filter membrane 17 moves to about 10 cm above the sediment. The filter membrane 17 can filter small particles of sediment so that they will not float upwards. After that, the staff opens the corresponding branch solenoid valve 9, and the mine water above the sediment is discharged into the drainage main pipe 10 through the drainage branch pipe 8. During the discharge process, the mine water may be disturbed, causing the sediment to float up, which can be blocked by the filter membrane 17, further reducing the possibility of small particles of sediment, especially insoluble lead, entering the dispersion barrel 12, thereby ensuring the accuracy of the test results.

[0029] The preferred technical solution is that a driving motor 18 is installed at the center of the upper surface of the dispersion barrel 12 in the dispersion step, and the output shaft of the driving motor 18 penetrates into the dispersion barrel 12 and is connected to the stirring shaft 19 through a coupling. A plurality of groups of stirring blades 20 are evenly arranged on the outer peripheral side surface of the stirring shaft 19. The driving motor 18 drives the stirring blades 20 through the stirring shaft 19 to stir and disperse the filtered and precipitated mine water, so that the water-soluble lead in the mine water is evenly distributed, and then sampling is performed, which can further improve the accuracy of the detection result.

[0030] Optionally, a plurality of sampling tubes 21 are provided in the sampling step, and the plurality of sampling tubes 21 are evenly arranged on the outer surface of the dispersion barrel 12 from top to bottom. The sampling tubes 21 at different heights can be used to sample the mine water at different heights in the dispersion barrel 12, and then they are tested separately, and the mean is counted and calculated, etc., to reduce the error of the test result.

[0031] Each sampling tube 21 is equipped with a sampling tube solenoid valve 22 for controlling the switch of the sampling tube 21; the sampling tube solenoid valve 22, the branch solenoid valve 9, the hydraulic pump of the hydraulic cylinder 15, the drive motor 18 and the valve 14 (electric valve) are all electrically connected to the external control switch and powered by an external power supply. The sampling tube solenoid valve 22, the branch solenoid valve 9, the hydraulic cylinder 15, the drive motor 18 and the valve 14 used in this application are all commonly used electronic components in the prior art, and their specific structure, working principle, control method and circuit connection are all well-known technologies and will not be described in detail here.

[0032] Furthermore, the lengths of the plurality of sampling tubes 21 are shortened from top to bottom, so that the mine water dripping from the sampling tubes 21 at higher places can be prevented from mixing into other samples during sampling.

[0033] Optionally, a static mixing tube 11 is installed on the drainage main pipe 10, and a static mixer is installed in the static mixing tube 11. The mine water in the drainage main pipe 10 is mixed and dispersed by the static mixer and then enters the dispersion barrel 12, which can further improve the dispersion uniformity of the mine water.

[0034] The undisclosed parts in the present invention are all prior art, and their specific structures, materials and working principles are not described in detail. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for determining water-soluble lead content, characterized in that: The following steps are involved: Sample processing: Sample processing includes the following steps: Filtration: The mine water to be tested is transported to the sedimentation box through the water inlet pipe. The filter net installed in the water inlet pipe is used to filter the mine water and remove large particles of impurities; Sedimentation: The filtered mine water is left to stand in the sedimentation tank, so that the unfiltered small particles of impurities in the mine water are settled to the bottom of the sedimentation tank; Dispersion: After sedimentation, the mine water is sent to the dispersion barrel through the drainage pipe installed on the sedimentation tank, and is fully dispersed by the dispersion mechanism in the dispersion barrel; Sampling: The dispersed mine water is discharged through the sampling tube provided on the dispersion barrel. Assay: The assay consists of the following steps: Atomization: The treated sample water sample is atomized and sent into a graphite furnace for heating to atomize the lead; Absorption measurement: Use a light source of a specific wavelength to irradiate the sample and detect the degree of light absorption by the sample. Determine the lead content in the sample based on the measured absorbance and reference to a pre-established standard curve.

2. A method for determining water-soluble lead content according to claim 1, characterized in that: In the filtering step, a sealing ring is rotatably arranged inside the water inlet pipe, the filter screen is arranged on the inner surface of the sealing ring, and two rotating shafts are symmetrically arranged on the sealing ring, one of which is rotatably arranged in a groove opened on the inner side of the water inlet pipe, and the top end of the other rotating shaft passes through the outer surface of the water inlet pipe and is connected to the rotating handle.

3. A method for determining water-soluble lead content according to claim 1, characterized in that: The drainage pipes in the dispersion step include several drainage branch pipes and one drainage main pipe. The several drainage branch pipes are evenly installed on the outer surface of the sedimentation tank from top to bottom, and the ends of the several drainage branch pipes are connected in parallel with the drainage main pipe through vertical pipes.

4. A method for determining water-soluble lead content according to claim 3, characterized in that: Each of the drainage branch pipes is equipped with a branch pipe solenoid valve.

5. A method for determining water-soluble lead content according to claim 3, characterized in that: A static mixing tube is installed on the main drainage pipe, and a static mixer is installed in the static mixing tube.

6. A method for determining water-soluble lead content according to claim 1, characterized in that: The lower surface of the sedimentation box is provided with a sedimentation discharge pipe, and a valve is installed on the sedimentation discharge pipe.

7. A method for determining water-soluble lead content according to claim 1, characterized in that: A hydraulic cylinder is installed at the center of the upper surface of the sedimentation box, the movable end of the hydraulic cylinder penetrates the sedimentation box, and a plurality of connecting rods are evenly arranged on the peripheral surface of the bottom end of the movable end of the hydraulic cylinder, a rubber ring is fixedly arranged at the bottom end of the connecting rod, and a filter membrane is arranged on the inner side of the rubber ring.

8. A method for determining water-soluble lead content according to claim 1, characterized in that: A driving motor is installed at the center of the upper surface of the dispersion barrel in the dispersion step, and the output shaft of the driving motor penetrates into the dispersion barrel and is connected to the stirring shaft through a coupling. A plurality of groups of stirring blades are evenly arranged on the outer peripheral side surface of the stirring shaft.

9. A method for determining water-soluble lead content according to claim 1, characterized in that: In the sampling step, a plurality of sampling tubes are arranged, and the plurality of sampling tubes are evenly arranged on the outer surface of the dispersion barrel from top to bottom, and the lengths of the plurality of sampling tubes are shortened from top to bottom, and each sampling tube is equipped with a sampling tube solenoid valve.

10. A method for determining water-soluble lead content according to any one of claims 1 to 9, characterized in that: The side surface of the sedimentation box 1 is provided with a transparent observation window, and the side surface of the observation window is evenly provided with scale lines.

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