阅读说明：本技术 一种检测烧结料中水分含量及元素含量的方法 (Method for detecting moisture content and element content in sintering material ) 是由 龚亚林 赵龙 宋青锋 龚俊华 王力东 张伟 陶俊涛 张永君 吕怀振 赵春阳 丛浩 于 2019-08-10 设计创作，主要内容包括：本发明公开一种检测烧结料中水分含量及元素含量的方法。水分含量是烧结料生产工艺中的重要指标,烧结料中的主要成分是铁元素,约占烧结混合料总质量的50%以上,而铁元素对热中子具有较高的吸收截面,所以烧结料中的铁元素含量波动会对中子测量水分含量技术产生干扰,而烧结混合料中的水分含量波动则会对PGNAA技术检测烧结料中的铁元素检测结果产生干扰。PGNAA技术自身采用中子产额较大的~(252)Cf自发裂变中子源做为中子发射源,将PGNAA技术与中子测水技术有效地结合在一起,通过PGNAA技术检测到的铁元素含量修正水分含量检测结果,同时应用修正后的水分测量结果修正烧结料中各元素的检测结果,实现提升PGNAA检测精度的目的。(The invention discloses a method for detecting the moisture content and element content in a sintering material. The moisture content is an important index in the production process of the sintering material, the main component in the sintering material is iron element which accounts for more than 50% of the total mass of the sintering mixture, and the iron element has a high absorption cross section for thermal neutrons, so that the fluctuation of the iron element content in the sintering material can interfere with the neutron moisture content measurement technology, and the fluctuation of the moisture content in the sintering mixture can interfere with the detection result of the iron element in the sintering material detected by the PGNAA technology. The PGNAA technique itself uses a neutron of greater yield 252 The Cf spontaneous fission neutron source is used as a neutron emission source, a PGNAA technology and a neutron water measurement technology are effectively combined together, the moisture content detection result is corrected through the content of the iron element detected by the PGNAA technology, meanwhile, the corrected moisture measurement result is applied to correct the detection result of each element in the sintering material, and the purpose of improving the PGNAA detection precision is achieved.)

1. A method for detecting the moisture content and the element content in a sintering material is characterized in that:

a He3 neutron tube and a belt scale are additionally arranged on the PGNAA detection device, and the moisture content of the sintered ore is detected by using a neutron source of the PGNAA detection device;

formula of moisture content of detection point:calculating;

wherein the variable load is the real-time belt load detected by the belt scale, the variable N is He3 neutron tube real-time counting, and the variable N₀Counting the number of neutron tubes in He3 when the conveying belt is unloaded, wherein the variable Fe is the content of iron element detected by PGNAA;

the parameters a, k and b are constants and are obtained by calibration experiment fitting.

2. The method for detecting the moisture content and the element content in the sintering material according to claim 1, wherein the method comprises the following steps:

the contents of calcium element, silicon element, iron element and magnesium element detected by PGNAA are recorded as variables Ca, Si, Fe and Mg, and the moisture content M is calculated_IThen, the content of each element is corrected and calculated, and the standard moisture of the detection point is recorded as a variableFinal iron element contentAccording to the formula:wherein the parametersIs a constant and is obtained by calibration experiment fitting;

final calcium contentCalculating the formula:whereinIs a constant and is obtained by calibration experiment fitting;

final elemental silicon contentCalculating the formula:whereinIs a constant and is obtained by calibration experiment fitting;

final magnesium element contentCalculating the formula:whereinIs constant and is obtained by calibration experiment fitting.

Technical Field

The invention relates to a neutron activation detection method, in particular to a neutron activation detection method capable of detecting moisture content and element content of a sintering material.

Background

The Prompt Gamma Neutron Activation Analysis (PGNAA) is a rapid and non-contact multi-element analysis technology, and is widely applied to industries such as building materials, coal, thermoelectricity, metallurgy, mines and the like. The principle of the prompt gamma neutron activation analysis technology is that a measured material and thermal neutrons generate capture reaction to generate characteristic gamma rays, the characteristic gamma rays penetrate through the measured material to reach a gamma ray detector to form a nuclear pulse signal, the nuclear pulse signal is converted into a digital signal through a multi-channel processor, and finally a characteristic gamma ray energy spectrum is formed. And performing spectrum resolving operation on the gamma-ray energy spectrum to obtain the relative content of each element. Moisture content index in the sintering material is an important index in the sintering production process, and a neutron water measurement technology is a very mature online moisture detection technology. The main component in the sintering material is iron element which accounts for more than 50 percent of the total mass of the sintering mixture, and the iron element has higher absorption cross section to thermal neutrons, so the fluctuation of the iron element content in the sintering material can interfere with the neutron moisture content measurement technology, and the fluctuation of the moisture content in the sintering mixture can generate dry detection results to the PGNAA technology for detecting the iron element in the sintering materialAnd (4) disturbing. The PGNAA technique itself uses a neutron of greater yield²⁵²The Cf spontaneous fission neutron source is used as a neutron emission source, so that a PGNAA technology and a neutron water measurement technology can be effectively combined together, the water content detection result is corrected through the content of the iron element detected by the PGNAA technology, the detection result of the iron element is corrected by applying the corrected water measurement result, and the purpose of improving the PGNAA detection precision is achieved.

Disclosure of Invention

The contents of components such as Tfe, CaO, SiO2, MgO and the like in the sintering material can be accurately analyzed by applying prompt gamma neutron activation equipment, and the moisture content in the sintering material can be detected by applying a neutron water detection technology. The PGNAA technique itself uses a neutron of greater yield²⁵²The Cf spontaneous fission neutron source is used as a neutron emission source, so that a PGNAA technology and a neutron water measurement technology can be effectively combined together, the water content detection result is corrected through the content of the iron element detected by the PGNAA technology, the detection result of the iron element is corrected by applying the corrected water measurement result, and the purpose of improving the PGNAA detection precision is achieved.

As shown in figure 1, a set of belt weigher is added in front of the prompt neutron activation detection equipment, so that the belt load on a sintering material conveying belt can be detected in real time. As shown in FIG. 2, two sets of He3 neutron tubes are added to the neutron activation detection equipment for detecting the neutron flux N of the system, and the neutron flux when the belt load is 0 is recorded as N₀. The content of iron element calculated by PGNAA system is recorded as Fe, the content of silicon element is recorded as Si, the content of calcium element is recorded as Ca, and the content of magnesium element is recorded as Mg. Because water molecules and iron atoms have larger absorption cross sections for neutrons, and neutron absorption cross sections of silicon, calcium and magnesium elements are relatively smaller (the relative content is also smaller), the content of moisture and iron elements influencing neutron flux in the sintering material, and the moisture content M_ICan be expressed by the following formula:

in the formula, the parameters k, a and b are constants and can be obtained by calibration experiment fitting.

Calculating the moisture content M_IThen, correcting and calculating the content of each element in the sintering material, and setting the standard moisture content asFinal iron element contentThe calculation formula is as follows:

parameter in the formulaIs constant and can be obtained by calibration experiment fitting.

Final calcium contentThe calculation formula is as follows:

parameter in the formulaIs constant and can be obtained by calibration experiment fitting.

Final elemental silicon contentThe calculation formula is as follows:

parameter in the formulaIs constant and can be obtained by calibration experiment fitting.

Final magnesium element contentThe calculation formula is as follows:

parameter in the formulaIs constant and can be obtained by calibration experiment fitting.

Has the advantages that:

the method realizes the simultaneous detection of the moisture content and the element content by applying a PGNAA device, and eliminates the error of moisture fluctuation on the element content detection by correcting the element content through the moisture content.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a block diagram of a prompt neutron activation detection device;

fig. 3 is a schematic diagram of the detection principle of the present invention.

1 belt weigher, 2 prompt neutron activation check out test set, 3 transport belts, 4 He3 neutron tubes, 5 prompt neutron activation check out test set detectors, 6 neutron absorbing plates, 7 neutron moderating materials, 8 neutron sources, 9 belt supporting plates, 10 measured materials, 11 signal processing systems, 12 intelligent host computers.

Detailed Description

As shown in figure 1, a belt scale is installed in front of a PGNAA device, and the load of a conveying belt is detected in real time and is marked as a variable load.

As shown in figure 2, a neutron tube He3 is added in a PGNAA device, the neutron flux of the system is detected in real time and is recorded as a variable N, and the neutron flux is recorded as the variable N when a transport belt is unloaded₀。

Standard moisture at the point of detection is noted as variableAnd the contents of calcium element, silicon element, iron element and magnesium element detected by PGNAA are marked as variables Ca, Si, Fe and Mg.

Moisture content M of detection point_ICalculated according to the following formula:

in the formula, parameters k, a and b are constants and are obtained by calibration experiment fitting.

Calculating the moisture content M_IThen, correcting and calculating the content of each element to obtain the final content of the iron elementThe calculation formula is as follows:

parameter in the formulaIs constant and is obtained by calibration experiment fitting.

Final calcium contentThe calculation formula is as follows:

parameter in the formulaIs constant and is obtained by calibration experiment fitting.

Final elemental silicon contentThe calculation formula is as follows:

parameter in the formulaIs constant and is obtained by calibration experiment fitting.

Final magnesium element contentThe calculation formula is as follows:

parameter in the formulaIs constant and is obtained by calibration experiment fitting.