SYSTEM AND METHOD FOR MONITORING AND CONTROLLING IRRIGATION DELIVERY IN LEACHING PILES

• US 20150045972A1
• Filed: 03/22/2013
• Published: 02/12/2015
• Est. Priority Date: 03/23/2012
• Status: Active Grant

• Current Assignee: Aplik S.A.
• Original Assignee: Aplik S.A.
• Inventors: Ramirez Mancilla, Jaime, Vidal Quevedo, Guillermo Ricardo, Alvarado Cordero, Andres Alfonso
• Granted Patent: US 9,763,397 B2
• Time in Patent Office: Days
• US Class Current: 700/284
• CPC Class Codes: A01G 25/167 Control by humidity of the soil itself or of devices simulating soil or of the atmosphere; Soil humidity sensors
• CPC Class Codes: G05B 1/01 electric
• CPC Class Codes: G05B 15/02 electric
• CPC Class Codes: G05B 2219/2625 Sprinkler, irrigation, watering

Abstract

The invention relates to a system and method for monitoring and controlling irrigation faults in leaching piles, comprising: a thermographic vision system and a visible spectrum vision system which capture images on areas of the leaching piles; an orientation system which selectively directs the capture lens of the thermographic vision and visible spectrum systems; a meteorological system which measures meteorological variables close to the leaching pile; a processing system which interacts with the thermographic vision and visible spectrum systems and with the meteorological system, processing information and, from the captured images, identifying the levels of moisture in pre-determined areas; and a user interface which displays the information processed by the processing system and allows the user to control variables of the thermographic vision and visible spectrum systems and of the orientation system.

Claims

1. A system for monitoring and controlling failures in irrigation of heap leach, comprising:

a system of thermographic vision and a vision system of visible spectrum to capture images of areas of the heap leach;

a guidance system that selectively directs the objective of capture of the thermographic vision and visible spectrum systems;

a processing system that interacts with the thermographic vision and visible spectrum systems, processing information, identifying, quantifying and classifying based on the captured images, the surfaces according to moisture levels;

dry areas, humid areas and saturated areas; and

a user interface that displays information processed by the processing system and allows the user to control variables of the thermographic vision and visible spectrum systems, and of the guidance system;

thus, allowing control over the process of irrigation of heap leach.

2. The monitoring and control system according to claim 1, wherein the thermographic vision and visible spectrum systems comprise a plurality of cameras, strategically placed in towers around the heap leach.

3. The monitoring and control system according to claim 1, wherein the thermographic vision system comprises a plurality of infrared radiation sensitive cameras in a range of 8 and 25 [μ

m].

4. The monitoring and control system according to claim 1, wherein the vision system of the visible spectrum operates in the visible range, quantifying the surface of zones saturated of excess of humidity or puddles, through the detection of textures.

5. The monitoring and control system according to claim 1, wherein the thermographic vision and processing systems allow to quantify the surface of the dry areas of the heap leach

6. The monitoring and control system according to claim 4, wherein the vision system of visible spectrum comprises a plurality of cameras with EMCCD technology, operating in a range of about 400 to 700 [nm] and with an illumination greater than or equal to 0.0005 [lux].

7. The monitoring and control system according to claim 1, wherein the user interface allows to inform, observe and monitor the irrigation failures.

8. The monitoring and control system according to claim 2, wherein the guidance system operates through servo-actuators that direct the objective of the capture of the cameras to the area of the heap to be monitored.

9. The monitoring and control system according to claim 1, wherein said system further comprises a weather system that measures weather variables in the vicinity of the heap leach, which interacts with the processing system so the already mentioned variables are considered in the processing of information, wherein it comprises a plurality of sensors located at least in one tower to a similar height of the surface of the heap.

10. The monitoring and control system according to claim 2, wherein said system further comprises a cleaning system that maximizes the availability of thermographic vision and visible spectrum systems, and which consists of a water pumping station and two industrial nibs that clean the glasses of each housing chamber.

11. The monitoring and control system according to claim 1, wherein the thermographic vision and visible spectrum systems comprise a feed, communication and control system

12. A method for quantitatively assessing the irrigation failures of at least one heap leach, comprising the following steps:

a) having a system of thermographic vision and a vision system of visible spectrum, which observe a plurality of modules or variables areas of heap leach for the capture of images, through the following steps;

capturing thermographic and in visible spectrum images of the module;

quantifying the percentage of surface of dry areas and irrigated areas based on temperature distributions in the module surface;

quantifying the surface percentage of saturated areas, based on textures in the images of the visible spectrum;

b) ordering the modules according to their percentage of area for each moisture level;

c) selecting modules that are located outside the predetermined control limits;

d) evaluating the irrigation efficiency in each module and in the heap leach;

e) displaying periodically information about the irrigation status of the modules outside the control limits, which is displayed in a user interface and generates a map of the state of the heap leach; and

f) implementing control measures on modules under the control limits.

13. The method according to claim 12, wherein the quantification of dry areas, irrigated areas and saturated areas is performed by complementing the capture of images with weather information, obtained from the environment of the heap leach, so to correct the information obtained from the thermographic and in visible spectrum images.

14. The method according to claim 12, wherein the identification of dry areas is performed through estimates of the temporal variance of the temperature for each measurement point, where each value is classified according to a threshold value.

15. The method according to claim 12, wherein the identification of saturated areas is performed based on the classification of each measuring point according to the visible texture of the point, wherein each measured point is compared with a threshold value and classified in reference to the latter.

16. The method according to claim 12, wherein after the capture of thermographic and in visible spectrum images, the obtained data are corrected in order to correct the distortion caused by the position of the camera of the vision systems.

17. The method according to claim 12, wherein implementation of control measures, involving the manipulation of an actuator system that automatically controls the irrigation in critical areas and an alarm system that alerts the presence of puddles of water or saturated areas.