Utilization of temperature heat adsorption skin temperature as scale control reagent driver

• US 10,316,394 B2
• Filed: 10/24/2016
• Issued: 06/11/2019
• Est. Priority Date: 07/26/2013
• Status: Active Grant

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Inventors: Coleman, Kim R., Arndt, Rolf
• Primary Examiner(s): Drodge, Joseph W
• Application Number:
  US15/332,795
• Publication Number:
  US 20170037493A1
• Time in Patent Office: 960 Days
• Field of Search: 210696, 210697, 210739, 210742, 210766, 210749, 210600, 374 1, 374 4, 374110, 374111, 374112, 374155, 702 2, 702 3, 422 14, 423 27, 423 29, 4236585
• CPC Class Codes: B01D 11/0207 Control systems
• CPC Class Codes: B05B 9/04 with pressurised or compressible container aerosol containers B65D83/14; with pump
• CPC Class Codes: C02F 2103/10 from quarries or from mining activities
• CPC Class Codes: C02F 2209/02 Temperature
• CPC Class Codes: C02F 5/00 Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents softening using ion-exchange C02F1/42
• CPC Class Codes: C02F 5/08 Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
• CPC Class Codes: C22B 11/04 by wet processes extraction of metal compounds by leaching in organic solutions C22B3/16; treatment or purification of solutions by liquid-liquid extraction C22B3/26
• CPC Class Codes: C22B 3/04 by leaching C22B3/18 takes precedence
• CPC Class Codes: C22B 3/20 Treatment or purification of solutions, e.g. obtained by leaching C22B3/18 takes precedence
• CPC Class Codes: C22B 3/44 by chemical processes treatment or purification of solutions by liquid-liquid extraction C22B3/26, by ion-exchange extraction C22B3/42
• CPC Class Codes: C22B 59/00 Obtaining rare earth metals
• CPC Class Codes: C22B 60/0221 by leaching
• CPC Class Codes: Y02P 10/20 Recycling

Abstract

The invention provides methods, compositions, and apparatuses for preventing the formation of scale in heap leach process solution distribution systems comprised of piping, spray nozzles, or emitter tubes. Solution distribution system components often become fouled by scale because of local hot spots more prone to form scale than other locations along the systems length. Positioning sensors that detect periods of high temperature stress and adjusting scale control reagent dosage to send the right amount to inhibit hot spot deposition allows for the control of scale without using wasteful excessive amounts of scale control reagents. This can vastly improve scale control performance under high temperature stress conditions while minimizing scale control reagent waste under less severe stress conditions to reduce the total operating cost of running heap leach mining operations which depend upon well-functioning solution distribution systems.

Claims

1. A process solution distribution system comprising:

a pump to distribute a scale control reagent to at least a portion of the process distribution system in response to a measured or calculated temperature;

emitter tubing in fluid communication with the pump and exposed to weather and direct sunlight and configured to allow dripping of a fluid onto a target area;

optional piping in fluid communication with the pump and the emitter tubing;

a section of tubing located within 1000 feet of the pump, the section of tubing comprising the same materials as the emitter tubing, the section of tubing characterized as not being in fluid communication with the pump or emitter tubing;

a first sensor affixed to the section of tubing, the first sensor adapted to measure or calculate the measured or calculated temperature; and

optionally at least one additional second sensor affixed to the section of tubing to measure or calculate the measured or calculated temperature; and

wherein the pump is adapted to automatically adjust the amount of scale control reagent distributed to at least a portion of the process distribution system based on the measured or calculated temperature.

2. The process solution distribution system of claim 1 wherein the first sensor and optionally the second sensor are selected from the list consisting of:

thermocouple, resistive temperature device, infrared detector, bimetallic device, liquid expansion device, and any combination thereof.

3. The process solution distribution system of claim 1 wherein the first sensor and optionally the second sensor are an optical sensor constructed and arranged to measure sunlight intensity, further wherein the temperature is calculated to correspond to a temperature at one or more localized locations along the emitter tubing, the piping, or both.

4. The process solution distribution system of claim 1 further comprising one or more nozzles, the nozzles in fluid communication with the pump and emitter tubing.

5. The process solution distribution system of claim 1 further comprising a process solution contained within the emitter tubing, the piping, or both the emitter tubing and the piping.

6. The process solution distribution system of claim 5 wherein the process solution is a barren solution or a lean pregnant solution.

7. The process solution distribution system of claim 5 wherein the measured or calculated temperature is a temperature that exceeds a threshold for scale formation within the process solution distribution system.

8. The process solution distribution system of claim 1 wherein the emitter tubing and optional piping define a plurality of discrete regions, wherein each discrete region is capable of having different surface temperatures;

and wherein the pump is adapted to distribute scale control reagent to a selected discrete region.

9. The process solution distribution system of claim 8 further comprising a process solution contained within the emitter tubing, the piping, or both the emitter tubing and the piping, wherein the selected discrete region comprises a surface temperature in excess of the threshold for scale formation within the process solution distribution system.

10. The process solution distribution system of claim 1 further comprising:

a heap of mineral containing ore;

a process solution contained within the emitter tubing, the piping, or both the emitter tubing and the piping; and

the emitter tubing, the piping, or both the emitter tubing and the piping positioned and adapted to distribute the process solution to the heap.

11. The process solution distribution system of claim 10 wherein the process solution is a barren solution or a lean pregnant solution.

12. The process solution distribution system of claim 10 wherein the mineral containing ore comprises gold, silver, uranium, or a rare earth metal.