CN107290355A - The online neutron activation alumina silica ratio analytical equipment of transmission-type bauxite and analysis method - Google Patents
The online neutron activation alumina silica ratio analytical equipment of transmission-type bauxite and analysis method Download PDFInfo
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- CN107290355A CN107290355A CN201610193909.2A CN201610193909A CN107290355A CN 107290355 A CN107290355 A CN 107290355A CN 201610193909 A CN201610193909 A CN 201610193909A CN 107290355 A CN107290355 A CN 107290355A
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- bauxite
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 229910001570 bauxite Inorganic materials 0.000 title claims abstract description 46
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 239000000377 silicon dioxide Substances 0.000 title claims abstract description 39
- 230000004913 activation Effects 0.000 title claims abstract description 15
- 238000004458 analytical method Methods 0.000 title claims abstract description 8
- 238000010183 spectrum analysis Methods 0.000 claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 19
- 239000004698 Polyethylene Substances 0.000 claims abstract description 13
- -1 polyethylene Polymers 0.000 claims abstract description 13
- 229920000573 polyethylene Polymers 0.000 claims abstract description 13
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 6
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical group [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000008054 signal transmission Effects 0.000 claims abstract description 4
- 230000005251 gamma ray Effects 0.000 claims description 27
- 230000001681 protective effect Effects 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 16
- 230000005284 excitation Effects 0.000 claims description 9
- 238000001228 spectrum Methods 0.000 claims description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000004411 aluminium Substances 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 230000005283 ground state Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 15
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004131 Bayer process Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 229910052664 nepheline Inorganic materials 0.000 description 2
- 239000010434 nepheline Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 229910052934 alunite Inorganic materials 0.000 description 1
- 239000010424 alunite Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009614 chemical analysis method Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000000155 isotopic effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000003947 neutron activation analysis Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- KPZTWMNLAFDTGF-UHFFFAOYSA-D trialuminum;potassium;hexahydroxide;disulfate Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O KPZTWMNLAFDTGF-UHFFFAOYSA-D 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/025—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material using neutrons
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
The online neutron activation alumina silica ratio analytical equipment of transmission-type bauxite and analysis method：Its measurement apparatus is that a gamma detector is fixed between upper belt and lower belt, neutron source is placed in the top of upper belt and bauxite, neutron is aimed downwardly on belt after bauxite has an effect with the atomic nucleus in bauxite, the ray received is converted into pulse signal transmission and gives the processing of Multi channel spectrum analysis device by gamma detector, effective information is uploaded to host computer by Multi channel spectrum analysis device, calculates the alumina silica ratio value of bauxite according to respective formula by host computer.Because finally calculating the ratio relation that obtained alumina silica ratio value is alundum (Al2O3) content and dioxide-containing silica, do not influenceed by the total amount of bauxite on belt；The bulk shielding protection of instrument uses two-layer structure, and internal layer is lead, and outer layer is polyethylene, reduces the usage amount to lead, reduces the cost and weight of instrument；Detector shield uses two-layer structure, and outer layer is polyethylene, and internal layer is cadmium plate, and the influence by neutron to gamma detector is minimized, and improves the analysis precision of instrument.
Description
Technical field
The present invention relates to a kind of online neutron activation analysis device and application method, a kind of online neutron activation alumina silica ratio analytical equipment of transmission-type bauxite and application method are in particulard relate to.
Background technology
Bauxite is most important bauxite resource in the world, next to that alunite, nepheline, clay etc..Current world's aluminum oxide industry, in addition to Russia is using nepheline production section aluminum oxide, it with bauxite is that raw material is produced that almost all aluminum oxide, which is all, in the world.And the ratio that one of good and bad leading indicator of bauxite is alundum (Al2O3) content and dioxide-containing silica in bauxite is weighed, it is commonly called as alumina silica ratio.
Alkaline process production aluminum oxide mainly has three kinds of Bayer process, sintering process and combination method etc., and adopts how to produce aluminum oxide, mainly by " alumina silica ratio " of bauxite is come what is determined.From the viewpoint of general technology and economy, ore alumina silica ratio generally selects sintering process for 3 or so；Ore of the alumina silica ratio higher than 10 can use Bayer process；When the grade of bauxite is in therebetween, preferable technical-economic index, to give full play to Bayer process and the respective advantage of sintering process, can be reached using combination method processing.Therefore, it is necessary to tested to the alumina silica ratio of raw material bauxite during aluminum oxide is produced, Instructing manufacture.
And the alumina silica ratio value of bauxite is determined at present, it is the artificial sampling from stockpile or belt by the way of, then the method for sample being passed through into chemical analysis, the content of wherein alundum (Al2O3) and silica is obtained, the alumina silica ratio value of bauxite is then obtained by calculating the ratio of alundum (Al2O3) content and dioxide-containing silica.
And the alumina silica ratio value of bauxite is obtained by chemical analysis methods and calculating by manual sampling to laboratory, artificial samples' representativeness is a problem, there are the processes such as drying, grinding, screening in process, when final alumina silica ratio value result comes out, it has been later thing of several hours, there is serious hysteresis quality in time, quality inspection afterwards can only be played a part of to production technology, do not have the effect for instructing technique adjustment.
There is presently no the instrument that on-line analysis alumina silica ratio value can be directly carried out to bauxite on belt.
The content of the invention
The defect existed for original technology, the present invention proposes a kind of online neutron activation alumina silica ratio analytical equipment of transmission-type bauxite and application method.
The concrete technical scheme taken of the present invention is：
Detector shield 13 is installed between the upper belt 2 at practical application scene and lower belt 1 by measurement bay 11, and shielding follower 5 is installed in the upper belt 2 at practical application scene and the top of bauxite by measurement bay 11.Measurement bay 11 is fixed by the belt holder 10 at scene, and the outside of measurement bay 11 is provided with protective cover 12.The inside of detector shield 13 is equipped with gamma ray detector 6, and gamma ray detector 6 couples with Multi channel spectrum analysis device 8, and Multi channel spectrum analysis device 8 couples with host computer 9.
12 points of protective cover is two layers, and the material of protective cover internal layer 122 is lead, and the material of protective cover outer layer 121 is polyethylene.
13 points of detector shield is two layers, and the material of detector shield internal layer 132 is cadmium, and the material of detector shielding volume surrounding 131 is polyethylene.
Shield and neutron source 3 is housed in follower 5, shielding follower 5 carries out shielding protection to neutron source 3.Shielding follower 5 is provided with the wedge-shaped collimating aperture 4 that can be closed, and when collimating aperture is opened, neutron ray can only irradiate in certain scope, after bore closure is collimated, and entirety is radiationless to leak.When in use, wedge-shaped collimating aperture 4 is opened wide, the neutron that neutron source 3 is sent is aimed downwardly, it is radiated upper belt 2 and carries bauxite thereon, neutron interacts with the atomic nucleus in bauxite, atomic nucleus, from stable ground state transition to unstable excitation state, the Characteristic γ ray of different-energy can be discharged when different elements by neutron activation when being activated atomic nucleus from excitation state de excitation.
The gamma-rays received is converted into pulse signal transmission to Multi channel spectrum analysis device 8 by gamma ray detector 6, Multi channel spectrum analysis device 8 transmits the impulse amplitude come to gamma ray detector 6 and is identified, and transverse axis correspondence ray energy, the power spectrum of longitudinal axis correspondence ray number are formed respectively, and the peak area S1 and S2 of correspondence aluminium element Characteristic γ ray energy peak and element silicon Characteristic γ ray energy peak are identified from power spectrum, data above S1, S2 is transferred to host computer 9 by Multi channel spectrum analysis device 8, and host computer 9 calculates the alumina silica ratio value P of bauxite according to following formula：
S1 is the peak area of aluminium element Characteristic γ ray energy peak in formula, S2 is the peak area of element silicon Characteristic γ ray energy peak, A, B, C, D, E are undetermined coefficient, measured by the different bauxite to known alumina silica ratio, handled and obtained using conventional nonlinear regression by the numerical value of measurement result S1, S2 and corresponding alumina silica ratio value.
Beneficial effect：
Because finally calculating the ratio relation that obtained alumina silica ratio value is alundum (Al2O3) content and dioxide-containing silica, do not influenceed by the total amount of bauxite on belt.
The bulk shielding protection of instrument uses two-layer structure, and internal layer is that lead is used to shield gamma-rays, and outer layer is that polyethylene is used for shielding neutron.Lead is placed in internal layer, the usage amount to lead can be reduced, the cost and weight of instrument is reduced.
Detector shield uses two-layer structure, and detector shielding volume surrounding is that polyethylene is used to absorb slow neutron and slowing down fast neutron, makes to be less than 0.5eV through the neutron energy after polyethylene；Detector shield internal layer is cadmium plate, and the neutron to energy less than 0.5eV has extremely strong sink effect.By the two-layer structure of detector shield, the influence by neutron to gamma detector is minimized, and improves the analysis precision of instrument.
Brief description of the drawings
Fig. 1 is the structural representation of device of the present invention
Fig. 2 is the section of structure of protective cover
Fig. 3 is the section of structure of detector shield
In figure：1 time belt, 2 upper belts, 3 neutron sources, 4 wedge-shaped collimating apertures, 5 shielding followers, 6 gamma detectors, 8 Multi channel spectrum analysis devices, 9 host computers, 10 belt holders, 11 measurement bays, 12 protective covers, 13 detector shields, 121 protective cover outer layers, 122 protective cover internal layers, 131 detectors shielding volume surrounding, 132 detector shield internal layers.
Embodiment
It is described with reference to the accompanying drawings the apparatus structure and application method of the present invention.
As shown in Figure 1：
Detector shield 13 is installed between the upper belt 2 at practical application scene and lower belt 1 by measurement bay 11, and shielding follower 5 is installed in the upper belt 2 at practical application scene and the top of bauxite by measurement bay 11.Measurement bay 11 is fixed by the belt holder 10 at scene, and the outside of measurement bay 11 is provided with protective cover 12.The inside of detector shield 13 is equipped with gamma ray detector 6, and gamma ray detector 6 couples with Multi channel spectrum analysis device 8, and Multi channel spectrum analysis device 8 couples with host computer 9.
Shield and neutron source 3 is housed in follower 5, shielding follower 5 carries out shielding protection to neutron source 3.Shielding follower 5 is provided with the wedge-shaped collimating aperture 4 that can be closed, and when collimating aperture is opened, neutron ray can only irradiate in certain scope, after bore closure is collimated, and entirety is radiationless to leak.When in use, wedge-shaped collimating aperture 4 is opened wide, the neutron that neutron source 3 is sent is aimed downwardly, it is radiated upper belt 2 and carries bauxite thereon, neutron interacts with the atomic nucleus in bauxite, atomic nucleus, from stable ground state transition to unstable excitation state, the Characteristic γ ray of different-energy can be discharged when different elements by neutron activation when being activated atomic nucleus from excitation state de excitation.
As shown in Figure 2：12 points of protective cover is two layers, and the material of protective cover internal layer 122 is lead, and the material of protective cover outer layer 121 is polyethylene.
As shown in Figure 3：13 points of detector shield is two layers, and the material of detector shield internal layer 132 is cadmium, and the material of detector shielding volume surrounding 131 is polyethylene.
The application method of the reflective online neutron activation alumina silica ratio analytical equipment of bauxite is as follows：
The gamma-rays received is converted into pulse signal transmission to Multi channel spectrum analysis device 8 by gamma ray detector 6, Multi channel spectrum analysis device 8 transmits the impulse amplitude come to gamma ray detector 6 and is identified, and formation transverse axis corresponds to ray energy, the power spectrum of longitudinal axis correspondence ray number respectively, and the peak area S1 and S2 for corresponding to aluminium element Characteristic γ ray energy peak and element silicon Characteristic γ ray energy peak are identified from power spectrum.It is Multi channel spectrum analysis device 8 from functional to form power spectrum and automatic peak-seeking, calculate peak area, and its technology is well known in industry.Data above S1, S2 is transferred to host computer 9 by Multi channel spectrum analysis device 8, and host computer 9 calculates the alumina silica ratio value P of bauxite according to following formula：
S1 is the peak area of aluminium element Characteristic γ ray energy peak in formula, S2 is the peak area of element silicon Characteristic γ ray energy peak, A, B, C, D, E are undetermined coefficient, measured by the different bauxite to known alumina silica ratio, handled and obtained using conventional nonlinear regression by the numerical value of measurement result S1, S2 and corresponding alumina silica ratio value.
Application example：
Neutron source 3 is from the Cf-252 isotopic sources that activity is 10 micrograms；
Gamma detector 6 is from NaI (Tl) scintillator detector that crystalline size is 100 × 100mm of Ф；
The high-speed figure Multi channel spectrum analysis device that Multi channel spectrum analysis device 8 is developed from Dandong Dongfang Measurement ＆ Control Technology Co., Ltd.；
Host computer 9 is from conventional industrial computer；
The material of protective cover internal layer 122 is lead, and thickness is 2 millimeters；
The material of protective cover outer layer 121 is polyethylene, and thickness is 10 centimetres；
The material of detector shield internal layer 132 is cadmium, and thickness is 0.5 millimeter；
The material of detector shielding volume surrounding 131 is polyethylene, and thickness is 5 centimetres；
The commission machining of measurement bay 11 factory makes；
The bauxite of alumina silica ratio value known to 20 kinds is measured using instrument model machine, the numerical value for obtaining A, B, C, D, E by nonlinear regression is respectively：A=4.4276, B=8.1117, C=5.2365, D=9.5728, E=0.0087.
Claims (4)
1. the online neutron activation alumina silica ratio analytical equipment of transmission-type bauxite, it is characterized in that：
The online neutron activation alumina silica ratio analytical equipment of described transmission-type bauxite includes：Detector shield（13）Pass through measurement bay（11）It is installed in the upper belt at practical application scene（2）With lower belt（1）Between, shield follower（5）Pass through measurement bay（11）It is installed in the upper belt at practical application scene（2）With the top of bauxite；Measurement bay（11）Pass through the belt holder at scene（10）It is fixed, measurement bay（11）Outside is provided with protective cover（12）；Detector shield（13）Inside is equipped with gamma ray detector（6）, gamma ray detector（6）With Multi channel spectrum analysis device（8）Connection, Multi channel spectrum analysis device（8）With host computer（9）Connection；
Shield follower（5）In be equipped with neutron source（3）, shield follower（5）To neutron source（3）Carry out shielding protection；Shield follower（5）It is provided with the wedge-shaped collimating aperture that can be closed（4）, when collimating aperture is opened, neutron ray can only irradiate in certain scope, after bore closure is collimated, and entirety is radiationless to leak.
2. based on the analysis method of the online neutron activation alumina silica ratio analytical equipment of claim 1 transmission-type bauxite, it is characterized in that：
The online bauxite aluminium-silicon of transmission-type neutron activation than analyzer when in use, wedge-shaped collimating aperture（4）Open wide, neutron source（3）The neutron sent is aimed downwardly, and is radiated upper belt（2）The bauxite of carrying, neutron interacts with the atomic nucleus in bauxite, atomic nucleus, from stable ground state transition to unstable excitation state, the Characteristic γ ray of different-energy can be discharged when different elements by neutron activation when being activated atomic nucleus from excitation state de excitation；
Gamma ray detector（6）The gamma-rays received is converted into pulse signal transmission and gives Multi channel spectrum analysis device（8）, Multi channel spectrum analysis device（8）To gamma ray detector（6）The impulse amplitude that transmission comes is identified, and transverse axis correspondence ray energy, the power spectrum of longitudinal axis correspondence ray number are formed respectively, and the peak area S1 and S2 of correspondence aluminium element Characteristic γ ray energy peak and element silicon Characteristic γ ray energy peak, Multi channel spectrum analysis device are identified from power spectrum（8）Data above S1, S2 is transferred to host computer（9）, host computer（9）The alumina silica ratio value P of bauxite is calculated according to following formula：
S1 is the peak area of aluminium element Characteristic γ ray energy peak in formula, S2 is the peak area of element silicon Characteristic γ ray energy peak, A, B, C, D, E are undetermined coefficient, measured by the different bauxite to known alumina silica ratio, handled and obtained using conventional nonlinear regression by the numerical value of measurement result S1, S2 and corresponding alumina silica ratio value.
3. the online neutron activation alumina silica ratio analytical equipment of transmission-type bauxite according to claim 1, it is characterized in that：Protective cover（12）It is divided into two layers, protective cover internal layer（122）Material be lead, protective cover outer layer（121）Material be polyethylene.
4. the online neutron activation alumina silica ratio analytical equipment of transmission-type bauxite according to claim 1, it is characterized in that：Detector shield（13）It is divided into two layers, detector shield internal layer（132）Material be cadmium, detector shielding volume surrounding（131）Material be polyethylene.
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