A rapid detection device for trace metals in ore pulp

Abstract

The present invention discloses a device for rapid detection of trace metal elements in ore pulp, including a laser, a spot adjustment lens group, a reflector, a focusing lens, a fluid sample chamber, an anti-sputtering wind wall tube, a spectrum collection lens group, a spectrum splitting and detection unit, a weak electric signal analysis unit, and a host computer component. The high-energy laser emitted by the laser excites the fluid in the sample chamber after beam expansion, reflection, and focusing. The anti-sputtering wind wall tube is located above the sample chamber, and a fluid outflow port is opened at the lower end of the sample chamber. The sample chamber and the spectrum collection lens group and the spectrum splitting and detection unit are installed together. The spectrum splitting and detection unit is connected to the weak electric signal analysis unit through a shielded cable, and the weak electric signal analysis unit is connected to the host computer through a communication cable. The present invention integrates technical solutions such as single-photon detection and anti-sputtering wind wall tube. Compared with the traditional laser induced breakdown spectroscopy technical solution, it is more suitable for measuring trace metal elements in fluids such as ore pulp.

Description

Technical Field

[0001] The invention relates to the field of trace metal detection, and in particular to a device for rapid detection of trace metal elements in ore pulp. Background Art

[0002] As the country and society have increasingly stringent requirements for environmental protection, how to detect trace metal elements present in processes such as flotation is a technical problem that industrial production companies in the non-ferrous metal field need to solve urgently.

[0003] At present, the traditional detection of trace metal elements in ore pulp in industrial processes is mainly based on laboratories. This detection cycle is long, labor-intensive, and not conducive to real-time adjustment of the process. At present, some companies also use online X-ray detection technology to detect metal elements in ore pulp, but this technical solution requires a long integration time for trace metal elements, which is close to the time spent in laboratory testing, and has poor detection effect on light elements. Summary of the invention

[0004] The present invention provides a device capable of rapidly detecting trace metal elements in ore pulp based on laser induced breakdown spectroscopy technology and photomultiplier tube single photon detection technology, and meets the process requirements for rapid online detection of metal elements in ore pulp. To achieve the above purpose, the present invention provides the following technical scheme: a device for rapid detection of trace metal elements in ore pulp, comprising a laser, a spot adjustment lens group, a reflector, a focusing lens, a fluid sample chamber, an anti-sputtering wind wall tube, a spectrum collection lens group, a spectrum splitting and detection unit, a weak electric signal analysis unit, and a host computer. After beam expansion, reflection, and focusing, the high-energy laser emitted by the laser excites the fluid in the fluid sample chamber. The anti-sputtering wind wall tube is located above the fluid sample chamber, and a fluid outflow port is opened at the lower end of the fluid sample chamber. The fluid sample chamber, the spectrum collection lens group, and the spectrum splitting and detection unit are installed together, the spectrum splitting and detection unit is connected to the weak electric signal analysis unit through a shielded cable, and the weak electric signal analysis unit is connected to the host computer through a communication cable.

[0005] The fixing method between the fluid sample chamber, the spectrum collection lens group, and the spectrum splitting and detection unit is based on more effective spectrum collection and is not limited to the above-mentioned installation method.

[0006] Compared with the prior art, the present invention has the following advantages and effects: the invention discloses a rapid detection device for trace metals in ore pulp, the weak electrical signal analysis unit adopted by the invention has single-photon detection technology and continuous signal simulation acquisition technology, and the spectral response dynamic range is large, wherein the single-photon detection effectively increases the detection capability of trace metal elements in ore pulp; by using an anti-sputtering wind wall tube, the contamination of the optical lenses around the sample chamber by the sputtering of ore pulp can be effectively reduced, the service life of the device can be increased, and the error of the analysis result can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0008] Figure 2 It is a structural diagram of the weak electric signal analysis unit of the present invention. DETAILED DESCRIPTION

[0009] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0010] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense.

[0011] See also Figure 1 , a device for rapid detection of trace metal elements in ore pulp, including a laser 1, a spot adjustment lens group 2, a reflector 3, a focusing lens 4, a fluid sample chamber 6, an anti-sputtering wind wall tube 5, a spectrum collection lens group 7, a spectrum splitting and detection unit 8, a weak electric signal analysis unit 9, and a host computer 10. After the high-energy laser emitted by the laser 1 undergoes processes such as beam expansion, reflection, and focusing, the fluid in the fluid sample chamber 6 is excited. The anti-sputtering wind wall tube 5 is located above the fluid sample chamber 6, and a fluid outlet is opened at the lower end of the fluid sample chamber 6. The fluid sample chamber 6, the spectrum collection lens group 7, and the spectrum splitting and detection unit 8 are installed together, and the spectrum splitting and detection unit 8 is connected to the weak electric signal analysis unit 9 through a shielded cable, and the weak electric signal analysis unit 9 is connected to the host computer 10 through a communication cable. The laser beam is focused near the sample surface by the focusing mirror 4, exciting the sample to produce a corresponding plasma spectrum. After being collected by the spectrum collecting lens group 7, the characteristic spectrum line is identified by the spectrum splitting and detection unit 8 and photoelectrically converted by the photomultiplier tube. The generated current signal is transmitted to the weak electric signal analysis unit 9. After the weak electric signal analysis unit 9 analyzes and processes the photocurrent signal, the processed data is transmitted to the host computer 10.

[0012] The internal structure of the weak electric signal analysis unit 9 is implemented in Figure 2, mainly including single-photon current-to-voltage conversion module (S21), operational amplifier 1 (S22), counter (S23), current continuous integration module (S24), operational amplifier 2 (S25), analog-to-digital conversion (S26), and main control chip (S27). After the detector (S20) converts the optical signal into an electrical signal, it is transmitted to the weak electrical signal analysis unit 9 through a coaxial cable. The current signal is synchronously converted and amplified by the single-photon current-to-voltage conversion module (S21) and the current continuous integration module (S24). When the input light intensity at the front end is at the single-photon level, the counter (S23) can count the voltage pulses output by the operational amplifier 1 (S22), and the analog-to-digital conversion module (S26) collects the continuous voltage output by the operational amplifier 2 (S25). The final data is processed by the main control chip (S27) and transmitted to the host computer 10 through the communication interface.

[0013] The weak electrical signal analysis unit 9 can receive a synchronous electrical signal (Trig) transmitted by the laser 1 or other optoelectronic devices.

[0014] The technical solution provided by the present invention integrates technologies such as single photon detection and anti-sputtering wind wall tube. Compared with the traditional laser induced breakdown spectroscopy technical solution, it is more suitable for measuring trace metal elements in fluids such as ore pulp.

[0015] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A device for rapid detection of trace metal elements in ore pulp, characterized in that: The device mainly includes a laser, a spot adjustment lens group, a reflector, a focusing lens, a fluid sample chamber, an anti-sputtering wind wall tube, a spectrum collection lens group, a spectrum splitting and detection unit, a weak electric signal analysis unit, and a host computer. The focusing mirror is located between the reflector and the fluid sample chamber. The high-energy laser emitted by the laser excites the fluid in the sample chamber after the beam expansion, reflection, and focusing processes. The anti-sputtering wind wall tube is located above the sample chamber. A fluid outflow outlet is opened at the lower end of the sample chamber. The fluid sample chamber and the spectrum collection lens group and the spectrum splitting and detection unit are installed together. The spectrum splitting and detection unit is connected to the weak electric signal analysis unit through a shielded cable, and the weak electric signal analysis unit is connected to the host computer through a communication cable. The laser beam is focused near the sample surface through the focusing mirror to excite the sample to generate a corresponding plasma spectrum. After being collected by the spectrum collection lens group, the spectrum splitting and detection unit identifies the characteristic spectrum line and performs photoelectric conversion through a photomultiplier tube. The generated current signal is transmitted to the weak electric signal analysis unit. After the weak electric signal analysis unit analyzes and processes the photocurrent signal, the processed data is transmitted to the host computer. The weak electric signal analysis unit has single-photon detection function and continuous signal simulation acquisition function, with high spectral response sensitivity and large dynamic range. The weak electric signal analysis unit consists of a detector, a single-photon current-voltage conversion module, operational amplifier 1, operational amplifier 2, a counter, a current continuous integration module, analog-to-digital conversion, and a main control chip. The counter realizes single-photon detection by quickly counting electrical pulses, and the current continuous integration module realizes the continuous signal simulation acquisition function. After the detector converts the optical signal into an electrical signal, it is transmitted to the weak electrical signal analysis unit through a coaxial cable. The current signal is synchronously converted and amplified by the single-photon current-to-voltage conversion module and the current continuous integration module. When the input light intensity at the front end is at the single-photon level, the counter can count the voltage pulses output by op amp 1, and the analog-to-digital conversion module collects the continuous voltage output by op amp 2. The final data is processed by the main control chip and transmitted to the host computer through the communication interface; the weak electrical signal analysis unit can receive the synchronous electrical signal transmitted by the laser; The anti-sputtering wind wall pipe is fixed above the sample chamber by a mechanical device, and an anti-sputtering wind wall can be formed around the fluid excitation point to prevent the slurry splashing from contaminating the optical lenses around the sample chamber.

2. The device for rapid detection of trace metal elements in ore pulp according to claim 1, characterized in that: Single photon detection technology effectively increases the ability to detect trace metal elements in ore slurry.

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