Laterite nickel ore washing method and system

Abstract

The invention discloses a laterite-nickel ore washing method and system.The laterite-nickel ore washing method comprises the steps that a high-pressure water gun is adopted for directly discharging laterite-nickel ore for pulping or ore heaps are flushed and mined nearby for pulping, and slurry is directly screened through a vibrating screen; after a residual ore mixture (containing large and small gravels and part of mud ore) enters the cylindrical ore washer for ore washing, discharging ore pulp of the cylindrical ore washer is flushed and screened through the vibrating screen to recover residual laterite-nickel ore, the ore unloading procedure is not affected by weather such as rainy seasons, and the method is suitable for laterite-nickel ore washing and pulp making under various site and weather conditions. And a groove type scrubbing machine which is poor in operation stability in the traditional ore washing process is omitted, the process is simple, the ore washing operation rate and the whole-line productivity can be obviously improved, and the ore washing effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ore washing, and in particular to a laterite nickel ore washing method and system. Background Art

[0002] The morphology of laterite nickel ore is mainly soil-based. After mining, it needs to be beneficiated for subsequent smelting such as wet acid leaching. The beneficiation of laterite nickel ore usually includes washing, chromite selection (chromite removal) and concentration. The purpose of washing is to separate the coarse ore in the laterite nickel ore.

[0003] In the traditional laterite nickel ore washing method, the washing process of laterite nickel ore includes: washing with a drum washer and washing with a trough scrubber in turn, so as to separate the coarse ore (including waste rock and ore with larger particle size) in the laterite nickel ore from the laterite nickel ore slurry, and the washed laterite nickel ore enters the chromium selection and concentration process. However, due to the high particle size and viscosity of laterite nickel ore, a large number of dump trucks, loaders, excavators and other machines are usually used in the unloading process. There are more gravel and debris in the laterite nickel ore, resulting in a high failure rate of the trough scrubber, which seriously affects the production efficiency of the entire line. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a laterite nickel ore washing method and system.

[0005] The present invention solves the technical problem by adopting the following technical solutions.

[0006] The invention provides a laterite nickel ore washing method, which comprises: adopting a hydraulic unloading method to wash and pulp the laterite nickel ore, introducing an ore mixture separated from the obtained raw ore pulp into a cylindrical ore washer for washing and screening, and then washing and screening the obtained washed and screened ore pulp through a vibrating screen to obtain a washed finished ore pulp.

[0007] The present invention also provides a laterite nickel ore washing system, comprising: a hydraulic mining device, comprising a water gun and a trench, a trench cover with sieve holes being provided on the top of the trench; a cylindrical ore washer, the cylindrical ore washer having an original ore inlet for entering the warehouse, a second ore pulp outlet and a large gravel outlet; a linear vibrating screen A, the linear vibrating screen A having a first ore pulp inlet, a first small gravel outlet and a third ore pulp outlet, a water spraying device being provided above the linear vibrating screen A; and a linear vibrating screen B, the linear vibrating screen B having a second ore pulp inlet, a second small gravel outlet and a fourth ore pulp outlet, a water spraying device being provided above the linear vibrating screen B, and the linear vibrating screen B being arranged on the downstream side of the cylindrical ore washer along the flow direction of the ore washing process, and the second ore pulp inlet is connected to the second ore pulp outlet of the cylindrical ore washer.

[0008] The present invention has the following beneficial effects:

[0009] The present invention provides a laterite nickel ore washing method and system. The laterite nickel ore washing method provided by the present invention comprises: the laterite nickel ore is directly unloaded and pulped by a high-pressure water gun or the ore pile is mined and pulped nearby, the slurry is directly washed and screened by a vibrating screen, and the residual ore mixture (including large and small gravels and part of the mud ore) enters the ore washer to wash and recover the remaining laterite nickel ore. The above-mentioned unloading process is not affected by the climate such as the rainy season, and is suitable for laterite nickel ore washing and pulping in various sites and climatic conditions. In addition, the trough scrubber with poor operating stability in the traditional ore washing process is eliminated, the process is simple, and the ore washing efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0011] Figure 1 A flow chart of a laterite nickel ore washing method;

[0012] Figure 2 Schematic diagram of the laterite nickel ore washing system. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0014] A laterite nickel ore washing method and system provided in an embodiment of the present invention are specifically described below.

[0015] In a first aspect, an embodiment of the present invention provides a laterite nickel ore washing method, which comprises: using a hydraulic unloading method to pulp the laterite nickel ore nearby, introducing the ore mixture separated from the obtained original ore pulp into a drum washing machine for washing and screening, and then washing and screening the obtained ore pulp through a vibrating screen to obtain a washed finished ore pulp.

[0016] According to statistics, nearly half of the world's laterite nickel ore is distributed in Indonesia, followed by the Philippines, Australia, New Caledonia and other countries. The nickel ore produced in Indonesia is "wet" laterite nickel ore. On the one hand, the water content of "wet" laterite nickel ore is usually high, the viscosity is large, and there is a certain proportion of gravel of different particle sizes. On the other hand, the tropical rainforest climate in the distribution area of ​​"wet" laterite nickel ore has a great impact on the operation time of mining. How to continuously and effectively produce laterite nickel ore or slurry on the basis of adapting to the local climate is an urgent problem to be solved.

[0017] In the traditional process, the washing process of laterite nickel ore is: washing with a cylindrical ore washer + washing with a trough scrubber + screening with a vibrating screen. The operation stability of this process is poor, and the failure rate of the trough scrubber is high. The main reason is that laterite nickel ore basically contains gravel, and the gravel has a relatively large particle size and hardness. In addition, it was found during the production process that since laterite nickel ore is a difficult-to-wash ore with a fine particle size and a large viscosity index, during the washing process of laterite nickel ore, the slurry cylinder of the cylindrical ore washer has insufficient soaking effect on the original ore and weak scrubbing effect, so it is easy for large clay balls to appear in the cylindrical ore washer. Under the influence of the above-mentioned multiple factors, the traditional method is adopted, such as washing the laterite nickel ore in the drum ore washer and then introducing the slurry discharged from the drum into the trough scrubber for soaking and scrubbing. The spiral bearings, spiral blades, motors, reducers and other failures of the trough scrubber often occur, and the gravel and debris in the slurry block the chute of the trough scrubber, which brings many troubles to the ore washing production, such as parking for maintenance and reduced production capacity, which in turn affects the subsequent mineral processing process and the efficiency of the entire line.

[0018] In order to reduce the probability of failure, improve the washing efficiency and the production efficiency of the whole line, the present invention provides a laterite nickel ore washing process, the main process flow is: hydraulic ore unloading + cylindrical ore washing + vibrating screen washing and screening, the trough scrubber with poor operating stability is eliminated, and the muddy gravel on the vibrating screen is strengthened by washing to ensure the washing effect. Specifically:

[0019] In the unloading process, due to the obvious existence of rainy seasons and dry seasons in the distribution area of ​​"wet" laterite nickel ore, the inventor has proposed through practice that different mining methods should be adopted according to different climatic characteristics. In the rainy season, hydraulic unloading method is mainly used for unloading, which can make full use of the abundant rainfall in the rainy season, smoothly mine and produce, and greatly reduce the mining cost.

[0020] In the ore washing process, the solution provided by the embodiment of the present invention is to introduce the ore mixture separated from the original ore slurry obtained by hydraulic unloading into the drum ore washer, and after washing and screening in the drum ore washer, it is directly sent to the vibrating screen for washing and screening without being scrubbed by the trough scrubber. Since the ore washing and screening slurry obtained by the drum ore washer is distributed on the entire screen surface, not only will there be no failures of the spiral bearings, spiral blades, motors, reducers, etc. of the trough scrubber, and the problem of gravel and debris in the ore slurry clogging the chute of the trough scrubber will not occur, but after the trough scrubber is eliminated, the ore The ore washing process is carried out smoothly and continuously. In addition, it has the advantages of improving the ore washing operation rate, the full-line production capacity, shortening the ore washing process, reducing the floor space, and reducing the ore washing cost. The material on the vibrating screen can wash off the fine-grained ore mud attached to the surface of the muddy ore more quickly and more effectively under the action of strong flushing and vibration, and the ore washing effect is good. In addition, the method provided in the embodiment of the present invention can also be used to obtain finished ore washing pulp, which can be directly used for wet smelting after simple treatment, thereby shortening the wet smelting process and reducing production costs.

[0021] In some optional embodiments, the laterite nickel ore washing process includes: using a hydraulic unloading method to pulp the laterite nickel ore nearby to obtain a raw ore pulp, introducing the ore mixture separated from the obtained raw ore pulp into a drum ore washing machine for washing and screening, and then washing and screening the first ore pulp separated from the raw ore pulp and the second ore pulp obtained by washing and screening through a vibrating screen respectively, and combining the slurries obtained by washing and screening to obtain a washed finished ore pulp.

[0022] In some optional embodiments, the laterite nickel ore washing process comprises the following steps:

[0023] Wash and pulp the laterite nickel ore from the ore pile or dump truck to obtain raw ore pulp;

[0024] The raw ore pulp is subjected to a first screening to obtain a mixture of a first ore pulp and residual ore;

[0025] The remaining ore mixture is subjected to a second screening to obtain raw ore and coarse gravel for storage;

[0026] The raw ore entering the warehouse is introduced into the drum ore washer for ore washing and screening to obtain the second ore pulp and large gravel;

[0027] The first slurry is subjected to a third screening to obtain a third slurry and first small gravels; the second slurry is subjected to a fourth screening to obtain a fourth slurry and second small gravels;

[0028] The third ore pulp and the fourth ore pulp are combined to obtain a finished ore washing slurry.

[0029] In some optional embodiments, the laterite nickel ore is limonite-type laterite nickel ore and contains gravels of different particle sizes.

[0030] In some optional embodiments, a high-pressure water gun is used to supply water for pulping, and the high-pressure water pressure is controlled to be 0.3-1.5 MPa.

[0031] The embodiment of the present invention provides a laterite nickel ore washing method, which adopts a hydraulic unloading method to carry out pulping of the laterite nickel ore nearby. The method is not affected by the climate such as the rainy season, and is applicable to the laterite nickel ore washing and pulping in various sites and climate conditions. It can also reduce the use of unloading machines such as forklifts and excavators in the unloading process, reduce the operating pressure of equipment such as heavy plate feeders and drum ore washers, reduce the failure rate, and reduce the energy consumption cost of corresponding machines. At the same time, it also has the advantages of small investment, quick effect, good economic applicability, etc.

[0032] In some optional embodiments, the first screening is performed using a trench cover with sieve holes located at the top of the trench, the sieve holes on the trench cover have a width of 10-50 mm and a length of 10-500 mm, so as to facilitate obtaining slurry under the screen that can directly enter the vibrating screen; at the same time, the amount of gravel entering the vibrating screen is controlled to ensure the flushing effect on the vibrating screen.

[0033] The embodiment of the present invention provides a laterite nickel ore washing method, wherein the raw ore pulp obtained by the hydraulic unloading method is subjected to the first screening, and the raw ore pulp can be subjected to the first screening to obtain a mixture of the first ore pulp and the residual ore. Since the laterite nickel ore mined in the rainy season has a large viscosity and a high water content, a trench cover with sieve holes located at the top of the trench is used to screen the raw ore pulp. The screening can not only quickly and effectively separate the ore mud and gravel in most of the laterite nickel ore, but also the remaining part of the ore mud and gravel mixture on the sieve is transferred to a drum ore washer for soaking, washing and scrubbing. Compared with adding a large amount of flushing water at the feeding end to allow the high-viscosity raw ore to smoothly enter the ore washing equipment, the method in the embodiment of the present invention is more simple and effective, and can also greatly reduce the amount of raw ore fed into the drum ore washer, which is conducive to improving production output and efficiency.

[0034] In some optional embodiments, the second screening is performed using a heavy-duty grid screen, the screen holes of which are 300-400 mm wide and 300-1000 mm long, so as to keep oversized gravel out of the drum ore washer and reduce damage to the equipment of the drum ore washer; at the same time, the amount of gravel that cannot enter the drum ore washer is reasonably controlled to ensure the production efficiency of the heavy-duty grid screen.

[0035] The embodiment of the present invention provides a laterite nickel ore washing method, in which the second screening adopts a heavy-duty grid screen for screening. The above screening step can screen out the coarse gravel in the residual ore mixture, which can not only improve the safety of subsequent production, but also reduce the ore feed amount in the drum ore washer and improve production efficiency.

[0036] In some optional embodiments, the ore washing and screening is performed using a drum plus screen bar type drum ore washing machine, which includes a washing section and a screening section. The width of the sieve hole of the screening section of the drum ore washing machine is 10-50mm, and the length is 10-500mm, so as to obtain the ore slurry that can directly enter the vibrating screen; at the same time, the amount of gravel entering the vibrating screen is controlled to ensure the flushing effect on the vibrating screen.

[0037] The embodiment of the present invention provides a laterite nickel ore washing method, in which a drum ore washer adopts a drum plus screen bar type drum ore washer for washing and screening. Compared with the full screening process and the screen plus slot washing process, the drum plus screen bar type drum ore washer performs two-stage scrubbing, and has a better washing effect. The drum ore washer has the dual functions of washing and screening, and can handle large pieces of ore. The above-mentioned screening step can screen out large gravels in the washing and screening slurry.

[0038] In some optional embodiments, the third screening and the fourth screening are performed using a linear vibrating screen with a water spray device. The width of the screen holes on the linear vibrating screen is 1-5 mm and the length is 1-50 mm, so that the slurry that can enter the ball mill can be obtained under the screen. At the same time, the amount of small gravel on the screen is reasonably controlled to ensure the flushing effect of the vibrating screen and improve the yield of valuable metals throughout the line.

[0039] The embodiment of the present invention provides a laterite nickel ore washing method, in which the first slurry separated from the original ore slurry and the second slurry separated in the drum ore washer are respectively sent to different linear vibrating screens for washing and screening, and the first slurry and the second slurry are distributed on the entire screen surface, so there will be no failure of the spiral bearing, spiral blade, motor, reducer, etc. of the trough scrubber, and the problem of gravel and debris in the slurry blocking the chute of the trough scrubber; secondly, the screen material of the linear vibrating screen can not only generate reciprocating linear trajectory vibration in the longitudinal axis direction, but also make the screen surface perform directional reciprocating linear vibration, thereby effectively improving the screening efficiency of the vibrating screen and reducing the screening cost; thirdly, under the action of hydraulic flushing, the high-pressure flushing water is ejected at high speed on the screen material of the linear vibrating screen, so that the slurry bonded together is separated into ore particles, and the ore particles with a particle size smaller than the pore size of the screen hole pass through the sieve hole and fall into the finished ore slurry storage tank below.

[0040] In some optional embodiments, the method further comprises: rewashing the first small gravel, wherein the rewashing equipment is a drum ore washer, a vibrating screen, or a newly introduced drum ore washer or vibrating screen.

[0041] It is worth noting that here, the first small gravel obtained by screening the first slurry through the linear vibrating screen is rewashed, and the fine mud on the surface of the first small gravel can be further cleaned. The cleaning equipment can be the linear vibrating screen A, the linear vibrating screen B or the drum ore washing machine in the ore washing system, and can also be a newly introduced linear vibrating screen or drum ore washing machine.

[0042] As can be seen from the above, the laterite nickel ore washing method provided by the embodiment of the present invention has the following advantages: (1) The process is not affected by the climate such as the rainy season, and is suitable for laterite nickel ore washing and slurrying in various sites and climatic conditions. (2) The use of shovels, excavators and other unloading machinery and equipment in the unloading process is reduced, the operating pressure of equipment such as heavy plate feeders and drum washers is reduced, and the failure rate is reduced, while the energy consumption cost of the corresponding machinery and equipment is reduced. (3) The trough scrubber is eliminated, which reduces the failure rate, equipment investment and operating costs, and improves the production efficiency of the entire line. (4) The finished ore slurry can be prepared, and the finished ore slurry can be used for subsequent wet smelting to collect nickel concentrate after simple adjustment.

[0043] In the second aspect, an embodiment of the present invention also provides a laterite nickel ore washing system, comprising: a hydraulic mining device, comprising a water gun and a trench, a trench cover with sieve holes being provided on the top of the trench; a cylindrical ore washer, the cylindrical ore washer having an ore inlet for entering the warehouse, a second slurry outlet and a large gravel outlet; a linear vibrating screen A, the linear vibrating screen A having a first slurry inlet, a first small gravel outlet and a third slurry outlet, a water spraying device being provided above the linear vibrating screen A; and a linear vibrating screen B, the linear vibrating screen B having a second slurry inlet, a second small gravel outlet and a fourth slurry outlet, a water spraying device being provided above the linear vibrating screen B, and the linear vibrating screen B being arranged on the downstream side of the cylindrical ore washer along the flow direction of the ore washing process and the second slurry inlet is connected to the second slurry outlet of the cylindrical ore washer.

[0044] In some optional embodiments, the first slurry at the outlet of the trench of the hydraulic mining device enters the linear vibrating screen A through the first slurry inlet on the linear vibrating screen A.

[0045] In some optional embodiments, the second slurry at the second slurry outlet of the drum ore washer enters the linear vibrating screen B through the second slurry inlet on the linear vibrating screen B.

[0046] In some optional embodiments, there are multiple water spray devices above the linear vibrating screen A. The water sprayed by the water spray device above the linear vibrating screen A dilutes and disperses the first slurry, so that the small gravels in the first slurry are separated from the slurry.

[0047] In some optional embodiments, there are multiple water spray devices above the linear vibrating screen B. The water sprayed by the water spray device above the linear vibrating screen B dilutes and disperses the second slurry, so that the small gravels in the second slurry are separated from the slurry.

[0048] In some optional embodiments, it further includes: a ore bin for storing laterite nickel ore, a horizontal grid is provided at the upper end of the ore bin, the ore bin has an inlet for residual ore mixture and an outlet for raw ore entering the bin, the ore bin is arranged on the upstream side of the drum ore washer along the flow direction of the ore washing process, and the outlet for raw ore entering the bin is connected to the inlet for raw ore entering the bin of the drum ore washer.

[0049] In some optional embodiments, it further comprises: an iron plate feeder, which is arranged between the ore bin and the drum ore washer to transport the laterite nickel ore from the ore bin to the drum ore washer.

[0050] In some optional embodiments, a first loader is further included, and the first loader is used to transport the residual ore mixture on the trench cover to the drum ore washer.

[0051] In some optional embodiments, it further includes a second loader, a first belt conveyor and a second belt conveyor, the second loader is used to transfer the coarse gravel on the ore bin grid screen to the first stockpile, the first belt conveyor is used to transfer the large gravel at the large gravel outlet of the drum ore washer to the second stockpile, and the second belt conveyor is used to transfer the second small gravel outlet on the linear vibrating screen B to the third stockpile.

[0052] In some optional embodiments, the number of the drum washers is one or more.

[0053] In some optional embodiments, the present invention further comprises a finished ore washing slurry storage tank disposed below the finished ore washing slurry outlet of the vibrating screen.

[0054] The present invention will be further described below in conjunction with the embodiments.

[0055] Example 1

[0056] A method for washing laterite nickel ore, see Figure 1 , including the following steps:

[0057] The laterite nickel ore is directly unloaded and pulped by a high-pressure water gun or pulped by nearby ore piles, with a water pressure of 0.6MPa to obtain raw ore pulp; the raw ore pulp is first screened through a trench cover with sieve holes at the top of the trench, the trench cover is 25mm wide and 100mm long, to obtain a first slurry and a residual ore mixture; the residual ore mixture enters a heavy-duty grid screen at the top of the raw ore bin for a second screening, the heavy-duty grid screen has a sieve hole width of 350mm and a length of 350mm, to obtain the raw ore and coarse gravel entering the bin; the raw ore entering the bin enters a drum ore washer through a heavy plate feeder for ore washing and screening, and the drum The sieve hole width of the ore washer screening section is 25mm and the length is 100mm, and the second ore pulp and large gravel are obtained; the first ore pulp enters the linear vibrating screen A for the third screening, and the sieve hole width of the linear vibrating screen A is 3mm and the length is 20mm, and the third ore pulp and the first small gravel are obtained; the second ore pulp enters the linear vibrating screen B for the fourth screening, and the sieve hole width of the linear vibrating screen B is 3mm and the length is 20mm, and the fourth ore pulp and the second small gravel are obtained; the first small gravel is introduced into the drum ore washer, the linear vibrating screen A, the linear vibrating screen B or the newly introduced drum ore washer and the linear vibrating screen for rewashing. The mud content of the second small gravel obtained in the end (-100 mesh particle size ratio) is 0.5%, and the Ni yield of the washing process is 93.60%.

[0058] Example 2

[0059] A laterite nickel ore washing system, see Figure 2 , including: a hydraulic mining device, including a water gun and a trench, a trench cover with sieve holes is provided on the top of the trench; a cylindrical ore washer, the cylindrical ore washer has an ore inlet for entering the warehouse, a second slurry outlet and a large gravel outlet; a linear vibrating screen A, the linear vibrating screen A has a first slurry inlet, a first small gravel outlet and a third slurry outlet, and a water spray device is provided above the linear vibrating screen A; and a linear vibrating screen B, the linear vibrating screen B has a second slurry inlet, a second small gravel outlet and a fourth slurry outlet, a water spray device is provided above the linear vibrating screen B, and the linear vibrating screen B is arranged on the downstream side of the cylindrical ore washer along the flow direction of the ore washing process, and the second slurry inlet is connected to the second slurry outlet of the cylindrical ore washer.

[0060] The first slurry at the outlet of the trench of the hydraulic mining device enters the linear vibrating screen A through the first slurry inlet on the vibrating screen A.

[0061] The second slurry at the second slurry outlet of the drum ore washer enters the linear vibrating screen B through the second slurry inlet on the vibrating screen B.

[0062] The invention also includes: an ore bin for storing laterite nickel ore is arranged on the upstream side of the drum ore washer, a horizontal grille is arranged on the upper end of the ore bin, the ore bin has an inlet for residual ore mixture, an outlet for raw ore entering the bin and an outlet for coarse gravel, the ore bin is arranged on the upstream side of the drum ore washer along the ore washing process flow direction, and the outlet for raw ore entering the bin is connected to the inlet for raw ore entering the bin of the drum ore washer. The iron plate feeder supplies the laterite ore in the ore bin to the drum ore washer through the ore inlet of the drum ore washer.

[0063] The machine also includes: a first loader, a second loader, a first belt conveyor, a second belt conveyor and a finished ore washing pulp storage tank. The ore mixture remaining on the trench cover is transferred to the ore bin by the first loader, the coarse gravel on the ore bin screen is transferred to the first stockpile by the second loader, the coarse gravel at the large gravel outlet of the drum ore washer is transferred to the second stockpile by the first belt conveyor, the second small gravel on the linear vibrating screen B is transferred to the third stockpile by the second belt conveyor, and the finished ore washing pulp obtained by combining the third ore pulp under the linear vibrating screen A and the fourth ore pulp under the linear vibrating screen B enters the finished ore washing pulp storage tank.

[0064] Comparative Example 1

[0065] The same laterite nickel ore as in Example 1 was subjected to a washing method of mechanical unloading + drum washing + trough scrubbing + vibrating screen, and the obtained second small gravel had a mud content of 1.6%, which was 1.1% higher than that of the second small gravel obtained in Example 1; the Ni yield in the washing process was 93.50%, which was 0.10% lower than that in the washing process in Example 1. Due to the use of mechanical unloading, the use cost of equipment and tools such as dump trucks and loaders increased significantly.

[0066] Comparative Example 2

[0067] The same laterite nickel ore as that in Example 1 is similar to the steps in Example 1, except that the sieve hole width of the cylindrical ore washer screening section is 60 mm and the length is 100 mm, the discharge amount of large gravel is reduced, the amount of small gravel on the vibrating screen is greatly increased, and the flushing effect is poor. As a result, the mud content of the second small gravel is increased to 2.1%, which is 1.6% higher than the mud content of the second small gravel obtained in Example 1; the Ni yield of the ore washing process is 93.47%, which is 0.13% lower than the Ni yield of the ore washing process in Example 1.

[0068] It can be seen from the above experimental results that: compared with the ore washing method of drum washing + trough scrubbing + vibrating screen, the ore washing method provided by the embodiment of the present invention saves a large amount of ore unloading machinery consumption, greatly reduces equipment failure rate, reduces equipment investment and operating costs, improves production efficiency, increases the ore washing operation rate and the full line capacity, and can achieve better ore washing effect and valuable metal recovery rate.

[0069] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A laterite nickel ore washing method, characterized in that: It includes: The laterite nickel ore is mined and pulped by hydraulic unloading method, and the ore mixture separated from the obtained original ore pulp is introduced into the drum ore washer for washing and screening, and then the obtained washed and screened ore pulp is washed and screened by a vibrating screen to obtain the washed finished ore pulp.

2. The laterite nickel ore washing method according to claim 1, characterized in that: It includes: The laterite nickel ore is pulped nearby by hydraulic unloading method to obtain raw ore pulp, the ore mixture separated from the obtained raw ore pulp is introduced into a cylindrical ore washer for ore washing and screening, and then the first ore pulp separated from the raw ore pulp and the second ore pulp obtained by the ore washing and screening are washed and screened by a vibrating screen respectively, and the ore pulps obtained by washing and screening are combined to obtain washed finished ore pulp.

3. The laterite nickel ore washing method according to claim 1 or 2, characterized in that: The following steps are involved: Wash and pulp the laterite nickel ore from the ore pile or dump truck to obtain raw ore pulp; The raw ore pulp is subjected to a first screening to obtain a mixture of a first ore pulp and residual ore; The residual ore mixture is subjected to a second screening to obtain raw ore and coarse gravel for storage; The raw ore entering the warehouse is introduced into a drum ore washer for ore washing and screening to obtain a second ore pulp and large gravel; Performing a third screening on the first slurry to obtain a third slurry and first small gravel; The second slurry is subjected to a fourth screening to obtain a fourth slurry and a second small gravel; The third ore pulp and the fourth ore pulp are combined to obtain a finished ore washing slurry.

4. The laterite nickel ore washing method according to claim 3, characterized in that: The laterite nickel ore is a limonite-type laterite nickel ore and contains gravels of different particle sizes.

5. The laterite nickel ore washing method according to claim 3, characterized in that: Use a high-pressure water gun to supply water for pulping and control the high-pressure water pressure to 0.3-1.5MPa.

6. The laterite nickel ore washing method according to claim 3, characterized in that: The first screening is performed using a trench cover with sieve holes located at the top of the trench, wherein the sieve holes on the trench cover have a width of 10-50 mm and a length of 10-500 mm.

7. The laterite nickel ore washing method according to claim 3, characterized in that: The second screening is performed using a heavy-duty grid screen, and the width of the sieve holes on the heavy-duty grid screen is 300-400 mm, and the length is 300-1000 mm.

8. The laterite nickel ore washing method according to claim 3, characterized in that: The ore washing and screening adopts a cylinder plus screen bar type cylinder ore washing machine for ore washing and screening. The cylinder plus screen bar type cylinder ore washing machine includes a washing section and a screening section. The width of the sieve hole of the screening section of the cylinder ore washing machine is 10-50mm, and the length is 10-500mm.

9. The laterite nickel ore washing method according to claim 3, characterized in that: The third screening and the fourth screening are performed by using a linear vibrating screen with a water spraying device, and the width of the screen holes on the linear vibrating screen is 1-5mm and the length is 1-50mm.

10. The laterite nickel ore washing method according to claim 3, characterized in that: Also includes: The first small gravel is rewashed, and the rewashing equipment is the drum ore washer, the vibrating screen, or a newly introduced drum ore washer and vibrating screen.

11. A laterite nickel ore washing system, characterized in that: include: A hydraulic mining device comprises a water gun and a trench, wherein a trench cover with sieve holes is provided on the top of the trench; a cylindrical ore washer, wherein the cylindrical ore washer has an inlet for raw ore entering the warehouse, a second slurry outlet and a large gravel outlet; a linear vibrating screen A, wherein the linear vibrating screen A has a first slurry inlet, a first small gravel outlet and a third slurry outlet, and a water spray device is provided above the linear vibrating screen A; and a linear vibrating screen B, wherein the linear vibrating screen B has a second slurry inlet, a second small gravel outlet and a fourth slurry outlet, and a water spray device is provided above the linear vibrating screen B, and the linear vibrating screen B is arranged on the downstream side of the cylindrical ore washer along the flow direction of the ore washing process, and the second slurry inlet is connected to the second slurry outlet of the cylindrical ore washer.

12. The laterite nickel ore washing system according to claim 11, characterized in that: The first slurry at the outlet of the trench of the hydraulic mining device enters the linear vibrating screen A through the first slurry inlet on the linear vibrating screen A.

13. The laterite nickel ore washing system according to claim 11, characterized in that: The second slurry at the second slurry outlet of the drum ore washer enters the linear vibrating screen B through the second slurry inlet on the linear vibrating screen B.

14. The laterite nickel ore washing system according to claim 11, characterized in that: There are multiple water spraying devices above the linear vibrating screen A and the linear vibrating screen B.

15. The laterite nickel ore washing system according to claim 11, characterized in that: Further including: An ore bin and an iron plate feeder for storing laterite nickel ore, wherein the ore bin is provided with a grid, an inlet for laterite nickel ore and an outlet for raw ore entering the bin, and the grid is erected at the feed inlet of the ore bin.

16. The laterite nickel ore washing system according to claim 15, characterized in that: The iron plate feeder is arranged between the ore bin and the drum ore washer to transport the laterite nickel ore from the ore bin to the drum ore washer.

17. The laterite nickel ore washing system according to claim 11, characterized in that: The hydraulic mining device further comprises a first loader, which is used to transport the residual ore mixture on the trench cover to the drum ore washer.

18. The laterite nickel ore washing system according to claim 11, characterized in that: It further includes a second loader, a first belt conveyor and a second belt conveyor, wherein the second loader is used to transfer the coarse gravel on the ore bin grid screen to the first stockpile, the first belt conveyor is used to transfer the large gravel at the large gravel outlet of the drum ore washer to the second stockpile, and the second belt conveyor is used to transfer the second small gravel outlet on the linear vibrating screen B to the third stockpile.

19. The laterite nickel ore washing system according to claim 11, characterized in that: The number of the drum ore washers is one or more.

20. The laterite nickel ore washing system according to claim 11, characterized in that: It further includes a finished ore washing slurry storage tank arranged below the finished ore washing slurry outlet of the vibrating screen.

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