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Laser in-situ detection system for oxygen concentration in arsenic-bearing gold concentrate roasting furnace

An oxygen concentration and in-situ detection technology, which is applied in the field of laser spectrum detection of gas concentration, can solve problems such as a large amount of calculation

Active Publication Date: 2015-01-28
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Due to the need to ensure the detection accuracy, the entire Gauss-Hermitian integral calculation process requires a large amount of calculation, which is not suitable for online real-time processing of arsenic-containing gold concentrates

Method used

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  • Laser in-situ detection system for oxygen concentration in arsenic-bearing gold concentrate roasting furnace
  • Laser in-situ detection system for oxygen concentration in arsenic-bearing gold concentrate roasting furnace
  • Laser in-situ detection system for oxygen concentration in arsenic-bearing gold concentrate roasting furnace

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example 1

[0064] The oxygen concentration laser in-situ detection system provided by the present invention will be described in detail below by taking an arsenic-containing gold concentrate roaster with an absolute temperature ranging from 296K to ~1500K as an example.

[0065] see figure 1 , the system mainly includes a semiconductor laser 1, a temperature and current controller 2 for driving the semiconductor laser, a signal generator 3 for generating a driving signal, an optical probe for receiving and converting the laser beam, and for collecting Temperature and pressure sensor 30, a data acquisition module 8 for receiving and collecting photoelectric, temperature and pressure signals, and a host computer 7 for calculating and detecting oxygen concentration, wherein,

[0066] The semiconductor laser 1 is a fiber-coupled near-infrared distributed semiconductor laser with a center wavelength of 768nm. Its output laser beam is output to the fiber coupler 12 of the optical probe through...

example 2

[0098] In order to verify the effect of the method of the present invention, this example respectively adopts the fitting function model constructed by the prior art based on the Gauss-Hermitian integral and the fitting function model provided by the present invention to use the temperature in the system described in Example 1. Under the conditions of 1000°C and 10% oxygen concentration, the oxygen concentration data in the arsenic-gold concentrate roaster were obtained, and the absorbance Voigt line shape fitting was carried out, and the Levenberg-Marquardt algorithm was used for iterative calculation. When the fitting function model constructed by special integral is used for Levenberg-Marquardt iterative calculation, the initial value of absorbance A 0 Select the integrated value of absorbance. The data obtained are shown in the table below:

[0099]

[0100] Compared with the above table, Figure 5 and Figure 6 It can be seen that the number of iterations when using...

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Abstract

The invention discloses a laser in-situ detection system for oxygen concentration in an arsenic-bearing gold concentrate roasting furnace. The system mainly comprises a semiconductor laser, a temperature and current controller for driving the semiconductor laser, a signal generator for generating driving signals, an optical probe for receiving and converting laser beams, a sensor for collecting the temperature and pressure inside the roasting furnace, a data acquisition module for receiving and collecting photoelectric, temperature and pressure signals and an upper computer for computing and detecting the oxygen concentration. The system overcomes the background radiation interference in a combustion environment through the steps of background radiation filtering, baseline correction, absorbance Voigt linear fitting, correction computation of oxygen spectral lines, oxygen concentration computation and inversion and the like, and realizes real-time accurate detection of the oxygen concentration in the roasting furnace.

Description

technical field [0001] The present invention relates to the testing of materials by means of determining their chemical or physical properties, and in particular to the detection of gas concentrations using laser spectroscopy. Background technique [0002] When arsenic-containing gold concentrate is roasted and smelted at high temperature, if there is insufficient oxygen in the roaster, the arsenic in the arsenic-containing gold concentrate will volatilize in the gaseous form of diarsenic trioxide; Arsenic oxide exists in the solid state, and arsenic pentoxide, ferric oxide and lead oxide in the slag form involatile arsenate, which will cause secondary wrapping of gold and reduce the output of gold. Therefore, it is necessary to strictly detect the oxygen concentration in the furnace during roasting and smelting. [0003] Existing oxygen concentration detection systems mainly include: a detection system using an extraction measuring device, a detection system using a zircon...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 张玉钧高彦伟高闽光尤坤何莹陈东刘建国刘文清
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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