Ore pulp pretreatment device suitable for neutron activation ore pulp element on-line analysis technology

Abstract

The utility model discloses an ore pulp pretreatment device suitable for a neutron activation ore pulp element on-line analysis technology, which is an ancillary facility of a neutron activation ore pulp element on-line analyzer and mainly comprises a pneumatic valve, a blending barrel, a stirrer, a circulating pump, a concentration meter and the like, the device described by the utility model is combined with a neutron activation ore pulp element on-line analyzer to realize automatic switching detection of ore pulp in two flow channels; the device can be used for adjusting the concentration of the ore pulp, the ore pulp with large concentration difference is adjusted to the same concentration, and the detection error of the neutron activated ore pulp on-line element analyzer caused by the difference of the concentration of the ore pulp is eliminated.

Description

TECHNICAL FIELD

[0001] The patent relates to a slurry pretreatment device, in particular to a slurry pretreatment device suitable for online element detection in a neutron activation slurry. BACKGROUND

[0002] The element content of the slurry is an important index in the process control of the beneficiation production process, and the entire beneficiation process is carried out around the grade of the raw ore, concentrate and tailings. The neutron activation online element analysis technology is a stable and efficient online element detection technology, which has been widely used in cement, steel, non-ferrous metal and coal industries.

[0003] However, since water has a high absorption effect on neutrons, the change in the concentration of the slurry will affect the distribution of the neutron field when the neutron activation technology is used to detect the element content of the slurry, thereby affecting the detection accuracy. SUMMARY

[0004] The patent describes a slurry pretreatment device for a neutron activation slurry online element analyzer, which can realize automatic switching detection of two flow channels of the slurry. During the pretreatment of the slurry, the concentration of the slurry is modulated, the influence of the change in the concentration of the slurry on the detection results of the neutron activation slurry online element analyzer is eliminated, and the detection accuracy of the system is improved.

[0005] Specifically, the patent designs a slurry pretreatment device, which is used in combination with a slurry sampler, a circulating pump, a neutron activation slurry online element analyzer and a concentration meter to realize automatic switching detection of two flow channels of the slurry, modulate the concentration of the slurry, reduce the fluctuation of the concentration of the slurry, eliminate the influence of the change in the concentration of the slurry on the detection results of the neutron activation slurry online element analyzer, and improve the detection accuracy of the system.

[0006] The patent comprises a circulating system composed of a slurry preparation barrel, a circulating pump, a neutron activation slurry online element analyzer, a concentration meter and a slurry circulating pipeline, and the slurry circulates in the circulating system.

[0007] The slurry pretreatment device is composed of two sets of A and B slurry preparation barrels and a slurry overflow barrel arranged symmetrically, and automatic switching detection of two flow channels of the slurry is realized by controlling an A pipeline slurry automatic sampler, a B pipeline slurry automatic sampler, an A barrel feeding valve, a B barrel feeding valve, a slurry circulating selection valve, an A barrel circulating valve, a B barrel circulating valve, an A barrel waste valve and a B barrel waste valve in combination with a circulating pump, a neutron activation slurry online element analyzer and a concentration meter. When the slurry in the A preparation barrel is detected, the B preparation barrel is operated to discharge and feed the slurry. When the slurry in the B preparation barrel is detected, the A preparation barrel is operated to discharge and feed the slurry. The slurry in the two preparation barrels is automatically switched and detected.

[0008] The slurry circulation selector valve (7) has three working states: A-tank circulation, B-tank circulation and ore discharge.

[0009] With the circulation pump running, open the circulation valve (15) of tank A, close the circulation valve (16) of tank B and the waste valve (17) of tank A, and set the slurry circulation selection valve (7) to the circulation state of tank A, then the slurry in tank A is ready to circulate; open the circulation valve (16) of tank B, close the circulation valve (15) of tank A and the waste valve (18) of tank B, and set the slurry circulation selection valve (7) to the circulation state of tank B, then the slurry in tank B is ready to circulate.

[0010] The system consists of preparing the slurry for feeding, detecting the slurry concentration, adjusting the slurry concentration, analyzing the slurry elements, and discharging the slurry, thus realizing automatic slurry circulation, concentration detection, concentration adjustment, and element detection.

[0011] To prevent cross-contamination of the slurries from the two flow channels, the patent incorporates a discharge cleaning function during flow channel switching. The slurry to be tested is pumped into the circulation pipe, and the slurry circulation selection valve is set to discharge mode. The slurry entering the circulation pipe will discharge the slurry remaining from the previous flow channel in the circulation pipe, circulation pump, neutron activation analyzer, concentration meter, and valves. The discharge time is set to [time missing]. t 1 After the ore discharge and washing are completed, the slurry circulation selector valve is set to circulation mode, and the slurry circulates within the circulation pipeline. Time constant t 1 The time required to drain residual slurry from the detection system pipeline is related to the volume of slurry in the pipeline. V 0 Related to the slurry circulation rate, the optimal time parameter t 1 It should be determined through experiments.

[0012] To address the challenge of large fluctuations in slurry concentration affecting the accuracy of online elemental detection in neutron-activated slurry, this patent proposes a slurry concentration modulation method. Because flotation slurry exhibits scaling, contact level gauges cannot operate stably for extended periods. Furthermore, the presence of numerous air bubbles on the slurry surface renders non-contact level gauges inaccurate. Therefore, to obtain precise slurry levels (volumes), this patent employs an overflow valve and a level switch, yielding two precise slurry volumes. V 1 and V 2 . V 2 Prepare a container for the volume of slurry that can hold. V 1 The volume of slurry that the preparation tank can hold after opening the overflow valve, and the lower limit of concentration in normal on-site production processes is [value missing]. C, the total volume of the slurry in the pipeline, circulating pump, on-line elemental analyzer, densimeter and valve during the slurry circulating process is V 0 , C 、 V 0 、 V 1 、 V 2 , C 1 . The slurry concentration detected by the densimeter is denoted as

[0013] 1) circulating the slurry and measuring the slurry concentration C 1 ;

[0014] 2) starting the overflow valve in the slurry preparation tank to lower the liquid level to the position of the overflow valve, at which time the volume of the slurry in the tank is V 1 , and closing the overflow valve;

[0015] judging the slurry concentration C 1 :

[0016] (1) when , no action is taken;

[0017] (2) when , the water supplement valve is opened to add water, and the volume of the added water is ;

[0018] (3) when , the slurry needs to be discharged, the volume of the discharged slurry is , and the time for opening the discharge valve is controlled t 4 The discharge amount is controlled according to the following formula:

[0019]

[0020] wherein b is the volume of the slurry discharged by the discharge valve during the opening and closing action, k is the discharge rate constant, which is determined by experiment. The water supplement valve is opened to add water until the liquid level switch above the preparation tank sends a closing signal, and the water addition is stopped after a delay of 2 seconds. The position of the liquid level switch is flush with the position of the overflow port above the preparation tank, and the excess water is discharged through the overflow port above the preparation tank. At this time, the volume of the slurry in the tank is V 2 .

[0021] After the slurry concentration is modulated, the concentration is stabilized at CNearby, then the neutron activation slurry on-line element analyzer element detection, can eliminate the detection error caused by slurry concentration fluctuation, improve the detection accuracy. Advantages

[0022] The advantages of the patent are:

[0023] The slurry pretreatment device can realize automatic switching of two-channel slurry detection, has a slurry concentration modulation function, and eliminates the influence of slurry concentration fluctuation on the neutron activation slurry on-line element detection technology.

[0024] The two-channel automatic switching detection of the neutron activation slurry on-line element analysis can be realized, the slurry concentration is stabilized, and the detection accuracy of the neutron activation slurry on-line element analyzer is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The structure diagram of the patent

[0026] Figure 2 It is a system workflow diagram.

[0027] In the figure: 1. A pipeline slurry automatic sampler, 2. B pipeline slurry automatic sampler, 3. A barrel feeding valve, 4. B barrel feeding valve, 5. A barrel stirrer, 6. B barrel stirrer, 7. Slurry circulation selection valve, 8. Water supply valve A, 9. Water supply valve B, 10. Liquid level switch A, 11. Liquid level switch B, 12. A slurry preparation barrel, 13. B slurry preparation barrel, 14. Slurry overflow barrel, 15. A barrel circulation valve, 16. B barrel circulation valve, 17. A barrel discard valve, 18. B barrel discard valve, 19. Circulation pump, 20. Neutron activation slurry on-line element analyzer, 21. Concentration meter, 22. A barrel overflow valve, 23. B barrel overflow valve, 24. Ore discharge pipe, 25. Slurry circulation pipeline, 26. A slurry conveying pipeline, 27. B slurry conveying pipeline, 28. A slurry sampling conveying pipeline, 29. B slurry sampling conveying pipeline, 30. Sampling slurry discharge pipeline, 31. A barrel slurry circulation back ore pipeline, 32. B barrel slurry circulation back ore pipeline, 37. Circulating slurry discharge pipeline, 38. Slurry preparation barrel overflow. DETAILED DESCRIPTION

[0028] The technical scheme of the patent will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the patent, rather than all the embodiments. Based on the embodiments in the patent, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the patent.

[0029] As Figure 1As shown, the device consists of two sets of ore pulp pretreatment device, two sets of system is marked as A and B, component 26, component 27 for factory ore pulp transport pipeline, respectively, on two pipes installed component 1 is marked as A pipe ore pulp automatic sampler, component 2 is marked as B pipe ore pulp automatic sampler, after ore pulp pretreatment ore pulp concentration target value is marked as C , the concentration is taken as the lower limit value of the concentration under normal production at this process point.

[0030] The system working process is divided into 10 sub actions, respectively as follows:

[0031] (1) A barrel ore pulp feeding:

[0032] Open component 1 (A pipe ore pulp automatic sampler), component 3 (A barrel feeding valve), component 5 (A barrel agitator), close component 22 (A barrel overflow valve), component 17 (A barrel discard valve), component 15 (A barrel circulating valve), component 1 (A pipe ore pulp automatic sampler) takes ore pulp sample after delivery to component 12 (A ore pulp preparation barrel) through component 28 (A ore pulp sampling transport pipeline), when A barrel ore pulp full barrel trigger component 10 (level switch A), delay 2 seconds, close component 1 (A pipe ore pulp automatic sampler), component 3 (A barrel feeding valve), at this time the residual ore pulp in the pipe flows to component 14 (ore pulp overflow barrel) through component 30 (sampling ore pulp discharge pipeline), and is discharged to the next process point through component 24 (discharge pipe), at this time the volume of ore pulp in component 12 (A ore pulp preparation barrel) is constant, marked as V 2 Component 10 (level switch A) and component 38 (ore pulp preparation barrel overflow port) are flush, delay 2 seconds, close component 1 (A pipe ore pulp automatic sampler), component 3 (A barrel feeding valve), in order to remove the foam on the surface of the ore pulp, causing the volume error of the ore pulp in the ore pulp preparation barrel, the excess ore pulp flows to component 14 (ore pulp overflow barrel) through component 38 (ore pulp preparation barrel overflow port), and is discharged to the next process point through component 24 (discharge pipe).

[0033] (2) first ore pulp circulation:

[0034] Open component 15 (A barrel circulating valve), component 19 (circulating pump), close component 16 (B barrel circulating valve), component 17 (A barrel discard valve), set component 7 (ore pulp circulating selection valve) to discharge state, the ore pulp in A barrel flows into component 14 (ore pulp overflow barrel) through component 25 (ore pulp circulating pipeline), component 19 (circulating pump), component 20 (sub online element analyzer), component 21 (concentration meter), component 7 (ore pulp circulating selection valve), component 37 (circulating ore pulp discharge pipeline), and is discharged to the next process point through component 24 (discharge pipe).

[0035] After t1 After a certain time, component 7 (slurry circulation selection valve) is set to the A-tank circulation state. The slurry in the A-tank circulates through component 25 (slurry circulation pipeline), component 19 (circulation pump), component 20 (neutron-activated slurry online elemental analyzer), component 21 (concentration meter), component 7 (slurry circulation selection valve), and component 31 (A-tank slurry circulation return pipeline). Component 22 (A-tank overflow valve) is opened, and the slurry above the liquid level at component 22 flows through component 22 (A-tank overflow valve) into component 14 (slurry overflow tank), and is discharged to the next process point through component 24 (discharge pipe).

[0036] go through t 2 After a certain time, close component 22 (overflow valve of tank A). At this time, the volume of slurry in component 12 (slurry preparation tank A) is constant, denoted as . V 1 The slurry volume within components 25 (slurry circulation pipeline), 19 (circulation pump), 20 (neutron-activated slurry online elemental analyzer), 21 (concentration meter), 7 (slurry circulation selection valve), and 31 (A-tank slurry circulation return pipeline) is a constant, denoted as . V 0 .

[0037] (3) Detect the concentration of slurry in container A:

[0038] Open component 15 (A tank circulation valve), close component 16 (B tank circulation valve) and component 17 (A tank waste valve), set component 7 (slurry circulation selection valve) to discharge state, and the slurry in tank A flows into component 14 (slurry overflow tank) through component 25 (slurry circulation pipeline), component 19 (circulation pump), component 20 (neutron activated slurry online elemental analyzer), component 21 (concentration meter), component 7 (slurry circulation selection valve), and component 37 (circulating slurry discharge pipeline), and is discharged to the next process point through component 24 (discharge pipe).

[0039] through t 1 After a certain time, component 7 (slurry circulation selection valve) is set to the A-tank circulation state. The slurry in the A-tank circulates through component 25 (slurry circulation pipeline), component 19 (circulation pump), component 20 (neutron-activated slurry online elemental analyzer), component 21 (concentration meter), component 7 (slurry circulation selection valve), and component 31 (A-tank slurry circulation return pipeline). Component 22 (A-tank overflow valve) is opened, and the slurry above the liquid level at component 22 flows through component 22 (A-tank overflow valve) into component 14 (slurry overflow tank), and is discharged to the next process point through component 24 (discharge pipe).

[0040] go through t 2After a certain time, close component 22 (overflow valve of tank A). At this time, the volume of slurry in component 12 (slurry preparation tank A) is constant, denoted as . V 1 The slurry volume within components 25 (slurry circulation pipeline), 19 (circulation pump), 20 (neutron-activated slurry online elemental analyzer), 21 (concentration meter), 7 (slurry circulation selection valve), and 31 (A-tank slurry circulation return pipeline) is a constant, denoted as . V 0 .

[0041] (4) Adjust the concentration of slurry in tank A:

[0042] The detection result of reading component 21 (concentration meter) within time t2 is recorded as follows: C 1 ,judge C 1 as follows:

[0043] 1) When No action was taken.

[0044] 2) When Open component 8 (water inlet valve A), add water volume ;

[0045] 3) When Then, component 17 (A bucket waste valve) is opened, and the ore discharge pipe is connected to component 24 (ore discharge pipe), discharging part of the slurry. The discharge volume is... .

[0046] The discharge rate is controlled by adjusting the opening time t4 of the waste material valve, as shown in the following formula:

[0047]

[0048] In the formula b This refers to the volume of slurry discharged when the discharge valve performs its opening and closing action. k The discharge rate constant is determined experimentally. After discharge is complete, component 17 (discard valve of bucket A) is closed, component 8 (water supply valve A) is opened, and the flow rate is increased until the closing signal of component 10 (tuning fork level switch A) is detected. After a 2-second delay, component 8 (water supply valve A) is closed.

[0049] (5) Feeding of slurry into tank B:

[0050] Open component 2 (B pipeline ore pulp automatic sampler), component 4 (B barrel into material valve), component 6 (B barrel agitator), close component 23 (B barrel overflow valve), component 18 (B barrel discard valve), component 16 (B barrel circulating valve), component 2 (B pipeline ore pulp automatic sampler) take ore sample after the pipeline to component 13 (B ore pulp preparation barrel) through component 29 (B ore pulp sampling transport pipeline), when B barrel ore pulp full barrel trigger component 11 (liquid level switch B), delay 2 seconds, close component 2 (B pipeline ore pulp automatic sampler), component 4 (B barrel into material valve), at this time the residual ore pulp in the pipe along component 30 (sampling ore pulp discharge pipeline) to component 14 (ore pulp overflow barrel), through component 24 (ore discharge pipe) to the next process point, at this time the volume of ore pulp in component 12 (A ore pulp preparation barrel) is constant, recorded as V 2 Component 11 (liquid level switch B) is flush with component 38 (ore pulp preparation barrel overflow port), delay 2 seconds, close component 2 (B pipeline ore pulp automatic sampler), component 4 (B barrel into material valve), in order to remove the foam on the surface of the ore pulp, the volume error of the ore pulp in the ore pulp preparation barrel, the excess ore pulp flows through component 38 (ore pulp preparation barrel overflow port) into component 14 (ore pulp overflow barrel), through component 24 (ore discharge pipe) to the next process point.

[0051] (6) detect B barrel ore pulp concentration:

[0052] Open component 16 (B barrel circulating valve), close component 15 (A barrel circulating valve), component 18 (B barrel discard valve), set component 7 (ore pulp circulating selection valve) to ore discharge state, the ore pulp in B barrel flows into component 14 (ore pulp overflow barrel) through component 25 (ore pulp circulating pipeline), component 19 (circulating pump), component 20 (neutron activation ore pulp online element analyzer), component 21 (concentration meter), component 7 (ore pulp circulating selection valve), component 37 (circulating ore pulp discharge pipeline), through component 24 (ore discharge pipe) to the next process point.

[0053] After t1 time, set component 7 (ore pulp circulating selection valve) to B barrel circulating state, the ore pulp in B barrel flows through component 25 (ore pulp circulating pipeline), component 19 (circulating pump), component 20 (neutron activation ore pulp online element analyzer), component 21 (concentration meter), component 7 (ore pulp circulating selection valve), component 32 (B barrel ore pulp circulating back ore pipeline) for circulating flow; open component 23 (B barrel overflow valve), the ore pulp above component 23 flows into component 14 (ore pulp overflow barrel) through component 23 (B barrel overflow valve), through component 24 (ore discharge pipe) to the next process point.

[0054] After t2 time, close component 23 (B barrel overflow valve), at this time the volume of ore pulp in component 13 (B ore pulp preparation barrel) is constant, recorded asV 1 The constant volume of the slurry in the components 25 (slurry circulating pipeline), 19 (circulating pump), 20 (neutron activation slurry online element analyzer), 21 (concentration meter), 7 (slurry circulating selection valve), and 32 (B bucket slurry circulating backfill pipeline) is denoted as V0. V 0 .

[0055] (7) Modulation of the B bucket slurry concentration:

[0056] The detection result of the component 21 (concentration meter) within the time t4 is denoted as V1. t 2 The detection result of the component 21 (concentration meter) within the time t4 is denoted as V1. C 1 , the following is determined: C 1

[0057] 1) When V1>V0, no action is taken.

[0058] 2) When V1 , the component 9 (water supplement valve B) is opened, and the water volume added is V0-V1. ;

[0059] 3) When V1 , the component 18 (B bucket waste valve) is opened, and the slurry pipeline is connected to the component 24 (slurry discharge pipeline) to discharge part of the slurry, and the slurry discharge volume is V0-V1. .

[0060] The slurry discharge volume is controlled by controlling the time t4 at which the waste valve is opened, and the formula is as follows:

[0061]

[0062] In the formula, Vd is the slurry volume discharged by the slurry discharge valve when the switch action is performed, b is a slurry discharge rate constant, which is determined by experiment. After the slurry discharge is completed, the component 18 (B bucket waste valve) is closed, the component 9 (water supplement valve B) is opened, and the component 11 (liquid level switch B) is detected to the closed signal, and after a delay of 2 seconds, the component 9 (water supplement valve B) is stopped and closed. k (8) A bucket slurry discharge:

[0063] The component 17 (A bucket waste valve) is opened to discharge slurry, the component 8 (water supplement valve A) is opened after 2 minutes, and the component 17 (A bucket waste valve), the component 8 (water supplement valve B), and the component 5 (A bucket agitator) are closed after 2 minutes.

[0064] (9) B bucket slurry discharge:

[0065]

[0066] ​​​Open component 18 (B barrel waste valve) to discharge ore. After 2 minutes, open component 9 (water supply valve B). After 2 minutes, close component 18 (B barrel waste valve), component 9 (water supply valve B), and component 6 (B barrel agitator).

[0067] (10) Elemental analysis of slurry:

[0068] Duration t 3 .

[0069] time constant t 1 The time required to drain residual slurry from the detection system pipeline is related to the volume of slurry in the pipeline. V 0 Related to the slurry circulation rate, the optimal time parameter t 1 It should be determined through experiments.

[0070] time constant t 2 The concentration measurement time can be increased appropriately to improve the representativeness of the concentration detection results; it can be set to 2-4 minutes.

[0071] time constant t 3 The detection cycle for mineral slurry elements should be increased as much as possible, usually set to 10 minutes.

[0072] Time parameters t 4 The discharge time is related to the measured concentration of the slurry. C 1 Related.

[0073] V 0 This represents the volume of slurry in the circulation pipeline, circulation pump, neutron activation analyzer, and concentration meter.

[0074] V 1 This represents the volume of slurry in the slurry preparation tank when it is full.

[0075] V 2 This indicates the volume of slurry inside the slurry preparation tank after the overflow valve installed on the slurry preparation tank has been opened and stabilized. V 2 < V 1 .

[0076] System workflow diagram as follows Figure 2, the system executes action (1) A barrel of ore pulp feeding, then executes action (2) first ore pulp circulation, opens the circulating pump, and measures the ore pulp concentration C 1 , then executes action (4) A barrel of ore pulp concentration modulation, and modulates the ore pulp concentration to a fixed value C , then executes action (5) B barrel of ore pulp feeding and step (10) ore pulp element analysis, which completes the online detection of A barrel of ore pulp elements. After the analysis of A barrel of ore pulp is completed, the system automatically executes action (8) A barrel of ore discharge and action (6) B barrel of ore pulp concentration detection, then executes action (7) B barrel of ore pulp concentration modulation, then executes action (1) A barrel of ore pulp feeding and action (10) ore pulp element analysis, which completes the online detection of B barrel of ore pulp elements. After the analysis of B barrel of ore pulp is completed, the system automatically analyzes A barrel of ore pulp and discharges B barrel of ore pulp, and the above steps are repeated, so as to realize the automatic analysis of two flow channels of ore pulp.

[0077] The flow realizes the following functions:

[0078] 1) Ore pulp sampling and preparation;

[0079] 2) Ore pulp circulation;

[0080] 3) Ore pulp concentration modulation;

[0081] 4) Ore pulp element content detection;

[0082] 5) Automatic switching detection of two flow channels of ore pulp.

[0083] The system realizes the automatic switching detection of two flow channels of ore pulp, stabilizes the ore pulp concentration, and further reduces the additional error of the neutron activation ore pulp element analyzer caused by the change of the ore pulp concentration, and improves the detection accuracy of the neutron activation ore pulp element analyzer.

Claims

1. A slurry pre-treatment device suitable for use in a neutron activation slurry element on-line analysis technique, characterised in that: The ore pulp pretreatment device is composed of two sets of ore pulp preparation barrels and an ore pulp overflow barrel arranged symmetrically, and automatic ore pulp sampling of A pipeline (1), automatic ore pulp sampling of B pipeline (2), A barrel feeding valve (3), B barrel feeding valve (4), ore pulp circulating selection valve (7), A barrel circulating valve (15), B barrel circulating valve (16), A barrel waste valve (17), B barrel waste valve (18), circulating pump (19), neutron activation ore pulp online element analyzer (20), and concentration meter (21) are used to realize automatic switching detection of two flow channels of ore pulp; when the ore pulp in the A preparation barrel is circulated and detected, the B preparation barrel is operated to discharge and feed ore; when the ore pulp in the B preparation barrel is circulated and detected, the A preparation barrel is operated to discharge and feed ore; the ore pulp in the two preparation barrels is automatically switched and circulated.

2. The ore pulp pre-treatment device suitable for online analysis technology of neutron activation ore pulp elements according to claim 1, characterized in that: The ore pulp circulating selection valve (7) has three working states: A barrel circulation, B barrel circulation and ore discharge; under the condition that the circulating pump (19) is opened, the A barrel circulating valve (15) is opened, the B barrel circulating valve (16) and the A barrel waste valve (17) are closed, the ore pulp circulating selection valve (7) is set to the A barrel circulation state, and then the ore pulp in the A preparation barrel flows circularly; the B barrel circulating valve (16) is opened, the A barrel circulating valve (15) and the B barrel waste valve (18) are closed, the ore pulp circulating selection valve (7) is set to the B barrel circulation state, and then the ore pulp in the B preparation barrel flows circularly.

3. The ore pulp pre-treatment device suitable for online analysis of neutron-activated ore pulp elements according to claim 1, characterized in that: In the flow channel switching process, the ore slurry to be detected is poured into the circulating pipeline, the ore slurry circulating selection valve (7) is set to the ore discharging state, and the ore slurry entering the circulating pipeline will discharge the ore slurry of the previous flow channel remaining in the circulating pipeline, the circulating pump, the neutron activation analyzer, the concentration meter and the valve. The ore discharging time is set to t 1 After the ore discharging and cleaning are completed, the ore slurry circulating selection valve (7) is set to the circulating state, and the ore slurry circulates in the circulating pipeline; the time constant t 1 is the time for discharging the residual ore slurry in the detection system pipeline, which is related to the total volume of the ore slurry in the circulating pipeline, the circulating pump, the neutron activation analyzer, the concentration meter and the valve V 0 and the circulating speed of the ore slurry. The optimal time parameter t 1 should be determined through experiments.

4. The ore pulp pre-treatment device suitable for online analysis of elements in neutron-activated ore pulp according to claim 1, characterized in that: The overflow valve, liquid level switch and water supplement valve are arranged on the ore slurry preparation barrel, the ore slurry volume before the ore slurry concentration is adjusted is obtained through the switch overflow valve V 1 , the ore slurry volume after the ore slurry concentration is adjusted is obtained through the liquid level switch and water supplement valve V 2 .

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