Methods and apparatus for the continuous monitoring of wear in flotation circuits

• US 9,649,640 B2
• Filed: 04/10/2015
• Issued: 05/16/2017
• Est. Priority Date: 04/16/2014
• Status: Active Grant

• Current Assignee: Flsmidth A/S (Flsmidth & Company A/S)
• Original Assignee: Flsmidth A/S (Flsmidth & Company A/S)
• Inventors: Peasley, Bob, Lelinski, Dariusz, Heinrichs, Robert, Jespersen, Mads, Sok, Thien
• Primary Examiner(s): PHAM, QUANG
• Application Number:
  US15/303,679
• Publication Number:
  US 20170036219A1
• Time in Patent Office: 767 Days
• CPC Class Codes: B03D 1/028 Control and monitoring of flotation processes; computer models therefor
• CPC Class Codes: B03D 1/16 with impellers; Subaeration machines mixing gases or vapours with liquids B01F23/20
• CPC Class Codes: G06K 7/10366 the interrogation device being adapted for miscellaneous applications

Abstract

A system for the continuous monitoring of wear is disclosed. The system comprises a flotation cell having at least one flotation component. At least one detector is provided to the at least one flotation component, and at least one sensor is provided to the flotation cell which is configured to communicate with the at least one detector during operation of the flotation cell. In use, the at least one flotation component wears away and ultimately affects a function of the least one detector. The at least one sensor is configured to monitor said function of the least one detector. When the at least one sensor detects a change in the signal of the at least one detector, an operator is notified that maintenance or flotation component replacement may be necessary.

Claims

1. A system for continuously monitoring wear of a rotor or stator in a flotation cell, comprising:

(a) the flotation cell comprising the rotor and the stator therein;

(b) multiple detectors;

each detector of said multiple detectors being embedded within a vane of the rotor or stator;

wherein a first detector of said multiple detectors is provided at a first radial location, in relation to a vertical axis of the flotation cell as a whole, which is different than a second radial location, in relation to said vertical axis of the flotation cell, of a second detector;

each detector being configured as a sacrificial RFID tag; and

(c) at least one sensor being configured as a reader/interrogator, the at least one sensor being provided to the flotation cell and configured to communicate with the multiple detectors wirelessly during operation of the flotation cell;

wherein in use, the rotor or stator wears away and ultimately affects a function of the multiple detectors such that the first detector fails to provide a first confirmation signal responding to a first check signal transmitted by the at least one sensor after being consumed by a first amount of wear to the rotor or stator, and the second detector fails to provide a second confirmation signal responding to a second check signal transmitted by the at least one sensor after being consumed by a second amount of wear to the rotor or stator;

the second amount of wear to the rotor or stator being greater than said first amount of wear to the rotor or stator;

wherein, by virtue of communication with the multiple detectors, the at least one sensor is configured to monitor said function of the multiple detectors and determine an operational status of the rotor or stator, the operational status relating to wear experienced by the rotor or stator, and

wherein in response to determining whether the rotor or stator experiences the second amount of wear, the at least one sensor is configured to relay an indication to notify an operator of the operational status of the rotor or stator.

2. The system of claim 1, wherein at least one of the multiple detectors comprises a low-frequency RFID tag, and the at least one sensor comprises a low-frequency detector/identifier in the kHz range of frequencies.

3. The system of claim 1, wherein at least one of the multiple detectors comprises an ultra-high frequency RFID tag, and the at least one sensor comprises an ultra-high frequency detector/identifier in the MHz range of frequencies.

4. The system of claim 1, wherein at least one of the multiple detectors comprises a microwave RFID tag, and the at least one sensor comprises a microwave detector/identifier which operates in the GHz range of frequencies.

5. The system of claim 1, wherein at least one of the multiple detectors comprises a self-powered RF-emitting wireless micro-transmitter, and the at least one sensor comprises a receiver tuned to the same frequency as said RF-emitting wireless micro-transmitter.

6. The system of claim 1, wherein the multiple detectors are provided to both the rotor and stator.

7. A flotation rotor or stator for use in a flotation cell comprising:

multiple detectors;

each detector of said multiple detectors being embedded within a vane of the flotation rotor or stator;

wherein a first detector of said multiple detectors is provided at a first radial or circumferential location, in relation to a vertical axis of the flotation cell as a whole, which is different than a second radial or circumferential location, in relation to said vertical axis of the flotation cell, of a second detector;

each detector being configured as a sacrificial RFID tag configured to wirelessly communicate with a sensor provided to the flotation cell;

the sensor being configured as reader/interrogator;

wherein in use, the flotation rotor or stator is configured to wear away ultimately affecting a function of the multiple detectors such that the first detector fails to provide a first confirmation signal responding to a first check signal transmitted by the sensor, after being consumed by a first amount of wear to the flotation rotor or stator, and the second detector fails to provide a second confirmation signal responding to a second check signal transmitted by the sensor, after being consumed by a second amount of wear to the flotation rotor or stator;

the second amount of wear to the flotation rotor or stator being greater than said first amount of wear to the flotation rotor or stator;

wherein, by virtue of wireless communication with said sensor, the multiple detectors are configured to aid in determining an operational status of the flotation rotor or stator, the operational status relating to wear experienced by the flotation rotor or stator, and

wherein in response to determining whether the flotation rotor or stator experiences the second amount of wear, said sensor is configured to relay an indication to notify an operator of the operational status of the flotation rotor or stator.

8. The flotation rotor or stator of claim 7, wherein at least one detector of the multiple detectors is provided to the flotation rotor or stator as a separate component.

9. The flotation rotor or stator of claim 7, further comprising a cavity 5 and a threaded insert, cover plug, cover cap, or tapered cover plug for embedding at least one detector of the multiple detectors.