CN114990353A - Screening method of aluminum extraction ash - Google Patents
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 57
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000012216 screening Methods 0.000 title claims abstract description 37
- 238000000605 extraction Methods 0.000 title claims abstract description 36
- 238000004458 analytical method Methods 0.000 claims abstract description 37
- 230000008569 process Effects 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 11
- 239000002893 slag Substances 0.000 claims description 44
- 239000000428 dust Substances 0.000 claims description 29
- 238000002156 mixing Methods 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 235000007237 Aegopodium podagraria Nutrition 0.000 claims description 3
- 244000045410 Aegopodium podagraria Species 0.000 claims description 3
- 235000014429 Angelica sylvestris Nutrition 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 abstract description 6
- 239000002910 solid waste Substances 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract 1
- 239000002956 ash Substances 0.000 description 124
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 18
- 239000000292 calcium oxide Substances 0.000 description 17
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 17
- 238000012360 testing method Methods 0.000 description 6
- 241000196324 Embryophyta Species 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- 229910001570 bauxite Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- -1 alumina Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B21/00—Obtaining aluminium
- C22B21/0007—Preliminary treatment of ores or scrap or any other metal source
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides a screening method of aluminum extraction ash. The method comprises the following steps: collecting the ash, preparing ash analysis sample, and analyzing the combustible material C, Al 2 O 3 CaO and SO 3 And (3) analyzing the content of the components, and substituting the result into a comprehensive discriminant formula (I) for calculation:
screening the ash according to the Q value, and when the Q value is less than or equal to 3.6, not taking the ash as an aluminum extraction raw material; when Q is more than 3.6, the ash is used as the raw material for extracting aluminum. By applying the technical scheme of the invention, the screening result can be quickly obtained by only analyzing and measuring the combustible C and a small amount of components of the ash sample and substituting the combustible C and the small amount of components into the comprehensive discriminant, then the ash which can be used for extracting aluminum is extracted according to the screening result, and the solid waste pile can be efficiently reducedThe screening method has the advantages of simple sampling process, few limiting conditions, simple analysis process, convenient and quick use and high result reliability, and has important significance for guiding the comprehensive utilization of ash residues.
Description
Technical Field
The invention relates to the technical field of comprehensive utilization of resources, in particular to a screening method of aluminum extraction ash.
Background
Coal is the most important primary energy in China and the main body of energy consumption in China, and a large amount of solid waste ash and slag can be generated in the combustion and use process of coal. The coal-fired solid waste ash in the northwest of the jin of China, the northern Shaanxi and the Mongolian region has rich aluminum-containing minerals, has the grade close to that of medium-low bauxite, and can be used for refining nonferrous metals such as alumina, silicon-aluminum alloy and the like. Considering that the shortage of high-quality bauxite resources is one of the bottlenecks restricting the development of the aluminum industry in China, the utilization of the coal-fired ash slag to extract the alumina can not only reduce the stockpiling of solid wastes, but also solve the problem that the bauxite in China depends on import, reduce the environmental pollution and save land resources.
The traditional method needs to carry out full-component analysis on the screening aluminum extraction ash slag, and the measurement parameters comprise silicon dioxide (SiO) 2 ) Aluminum oxide (Al) 2 O 3 ) Iron oxide (Fe) 2 O 3 ) Calcium oxide (CaO), magnesium oxide (MgO), and potassium oxide (K) 2 O), sodium oxide (Na) 2 O) and the like, and characteristic indexes such as ash ignition loss, dissolution activity and the like, the test period is long, a plurality of test instruments are provided, the analysis process is complex, and a technical method capable of rapidly screening the aluminum extraction ash is urgently needed in the first engineering line.
Disclosure of Invention
The invention mainly aims to provide a screening method of aluminum extraction ash, which aims to solve the problems of complex screening process and long period of the aluminum extraction ash in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a screening method of an extraction aluminous ash, comprising the steps of: step S1, collecting ash and slag samples including an ash sample original sample and a slag sample original sample; step S2, preparing the ash residue into an ash residue analysis sample; step S3, analyzing the ash slag for combustible substances C, Al in the sample 2 O 3 CaO and SO 3 Analyzing the content of the components; step S4, substituting the content analysis result into the comprehensive discriminant formula (I) to calculate:
step S5, screening the ash slag according to the calculated Q value; wherein Q is a screening index,
is Al 2 O 3 In mass percent of (b), w C Is the mass percentage content of combustible C, w CaO Is the weight percentage content of CaO,
is SO 3 The mass percentage of (A); when Q is less than or equal to 3.6, ash is not used as the raw material for extracting aluminum; when Q is more than 3.6, the ash is used as the raw material for extracting aluminum.
Further, when Q is more than or equal to 4.8, taking the ash slag as an aluminum extraction raw material for extracting aluminum; or when Q is more than 3.6 and less than 4.8, mixing the ash with Q more than or equal to 4.8 to form the aluminum extraction raw material.
Further, the ash is circulating fluidized bed boiler ash.
Further, the ash sample was collected as it was from the circulating fluidized bed boiler dust collector.
Further, when the dust remover is an electric dust remover or an electric bag composite dust remover, the ash sample is collected from the front part of the ash conveying bin pump; or when the dust remover is a bag-type dust remover, the ash sample is collected from the rear part of the ash conveying bin pump.
Further, the slag sample is collected from a slag conveyer behind a slag cooler of the circulating fluidized bed boiler.
Further, the sampling mass of the ash sample is 400-600 g, and the sampling mass of the slag sample is 200-300 g.
Further, mixing the ash sample original sample and the slag sample original sample to obtain an ash sample original sample; preferably, the mass ratio of the original ash sample to the original slag sample in the original ash sample is (2-4): 1.
Further, the ash is ground to a particle size of 0.1mm or less by a grinder, and then the ground ash is reduced to obtain 50-100 g of an ash analysis sample.
By applying the technical scheme of the invention, the aluminum extraction ash is screened by using the comprehensive discriminant, only the combustible C and a small amount of components of the ash sample are analyzed and determined, and the screening result can be quickly obtained by substituting the comprehensive discriminant into the comprehensive discriminant, and then the ash which can be used for extracting aluminum is extracted according to the screening result, so that the solid waste stockpiling can be efficiently reduced, and the environmental pollution is reduced. The screening method has the advantages of simple sampling process, few limiting conditions, simple analysis process, convenience and rapidness in use and high result reliability, and has important significance for guiding comprehensive utilization of ash residues.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic flow diagram of an aluminum extraction ash screening process according to embodiment 1 of the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Interpretation of terms:
screening index Q: and (3) evaluation parameters of the aluminum extraction ash.
As described in the background art, the problems of complex screening process and long period of the aluminum extraction ash exist in the prior art. In order to solve the above problems, in an exemplary embodiment of the present invention, there is provided a method for screening an aluminum extraction ash, including the steps of: step S1, collecting ash and slag samples including an ash sample original sample and a slag sample original sample; step S2, preparing the ash residue into an ash residue analysis sample; step S3, analyzing the ash slag for combustible substances C, Al in the sample 2 O 3 CaO and SO 3 Analyzing the content of the components; step S4, substituting the analysis result into the integrated judgment formula (I) to calculate:
step S5, screening the ash slag according to the calculated Q value; wherein Q is a screening index,
is Al 2 O 3 In mass percent of (b), w C Is the mass percentage content of combustible C, w CaO Is the weight percentage content of CaO,
is SO 3 The mass percentage of (A); when Q is less than or equal to 3.6, ash is not used as the raw material for extracting aluminum; when Q is more than 3.6, the ash is used as the raw material for extracting aluminum.
Firstly, collecting representative ash residue original sample, then preparing the ash residue original sample into an ash residue analysis sample, and respectively analyzing combustibles C and Al of the ash residue analysis sample 2 O 3 、CaO、SO 3 And (3) carrying out content analysis and determination on the components, substituting the analysis result into the comprehensive discriminant (I) for analysis and calculation, and finally combining the calculation result of the discriminant Q value to quickly screen the aluminum extraction ash. Wherein, the ash analysis sample is according to the 6 th part of the fuel test method of the thermal power plant: method for measuring combustible substance C in fly ash and slag (DL/T567.6-2016), and method for analyzing coal ash component (G)B/T1574-2007) method for determining Al 2 O 3 Content, CaO content and SO 3 The contents and the analysis results are expressed in percentage, which are well known to those skilled in the art and will not be described herein. The method can quickly obtain the screening result by only analyzing and measuring the combustible C and a few components of the ash sample and substituting the combustible C and a few components into the comprehensive discriminant, has simple sampling and analyzing process, convenient and quick use and high result reliability, and has important significance for guiding the comprehensive utilization of the ash.
The comprehensive discriminant formula (I) is obtained by: through orthogonal tests, four components with the content most influencing the screening of the aluminum extraction ash are found, namely combustible C, Al 2 O 3 CaO and SO 3 And defining a new relational expression of the screening index Q, namely the comprehensive discriminant (I) according to the parameters. The Q values of different samples can be obtained according to the comprehensive discriminant formula (I), and compared with the results obtained by using the conventional full-component analysis technology (the full-component analysis method has high data reliability, but has very complex analysis process and long analysis time, is more suitable for being used as an index for scientific research and is not suitable for being used as an index for production analysis), and the full-component analysis result is found to be high in activity (the activity of ash, namely the reaction rate of the ash when the ash is used for extracting alumina, and Al in the ash) 2 O 3 The leaching rate, namely, the aluminum extraction potential) can be independently extracted, the Q value of the sample is more than 4.8, the total component analysis result is a sample which is low in activity or inactive and is not suitable for extracting aluminum, and the Q value is less than 3.6, so that the Q value result is divided into three intervals. In a preferred embodiment, when Q is more than or equal to 4.8, the ash is separately used as an aluminum extraction raw material to extract aluminum; or when Q is more than 3.6 and less than 4.8, mixing the ash with Q more than or equal to 4.8 to form the aluminum extraction raw material. The greater the Q, the greater the aluminum extraction potential. The ash residue which can be used for extracting aluminum independently has high alumina content and high aluminum extraction potential, can be directly used as an aluminum extraction raw material for extracting aluminum oxide, and has better yield and quality; the ash residue which can not be used for extracting aluminum has low content of aluminum oxide, small aluminum extraction potential, is not suitable for utilization, has low product grade when being used for extracting aluminum oxide, and can be storedStandby; the middle ash has certain aluminum extraction potential, and can be mixed and utilized with the ash which can be used for extracting aluminum independently according to requirements, so that the utilization rate of the solid waste of the ash is further improved.
The screening method can be used for production processes with ash output under different working conditions, the ash can be circulating fluidized bed boiler ash, and the screening result is more accurate.
In order to obtain a more representative ash sample, in a preferred embodiment, the ash sample is collected as it is from a circulating fluidized bed boiler dust collector.
According to different dust removal devices, the collection positions of the original dust sample are slightly different, and a finer and more uniform dust sample is obtained by combining the characteristics of a dust removal mode. In a preferred embodiment, when the dust collector is an electric dust collector or an electric bag composite dust collector, the ash sample is collected from the dust collector ash bucket (i.e. the front part of the ash conveying bin pump) as it is; or when the dust remover is a bag-type dust remover, the ash sample is collected from the rear part of the ash conveying bin pump (namely an ash bin) as it is.
In a preferred embodiment, the slag sample is taken as such from a slag conveyor following the slag cooler of the circulating fluidized bed boiler. The ash sample original sample and the slag sample original sample collected at the parts are more representative, the obtained screening result is more accurate, and the method has more guiding significance for comprehensive utilization of the circulating fluidized bed boiler ash.
For the purpose of further ensuring the sampling accuracy and uniformity, in a preferred embodiment, the sampling mass of the ash sample as it is 400-600 g, and the sampling mass of the slag sample as it is 200-300 g.
In a preferred embodiment, the ash sample is mixed with the slag sample to obtain an ash sample, which is then stored in a sealed container. Preferably, the mass ratio of the original ash sample to the original slag sample in the original ash sample is (2-4): 1, so that the preparation and content measurement of a subsequent ash analysis sample are facilitated.
In order to facilitate analysis and measurement, in a preferred embodiment, the ash is ground to the particle size of less than 0.1mm by using a sealed grinder, then the ash is divided, the mass is reduced under the condition of unchanged particle size, so that the subsequent workload and the sample mass required by the test are reduced, 50-100 g of ash analysis sample is obtained, and the ash analysis sample is stored in a sealed manner for later use. The division step may be performed by a conventional method, and is not described herein again.
The present application is described in further detail below with reference to specific examples, which should not be construed as limiting the scope of the present application as claimed.
The determination method comprises the following steps:
combustible C content: method for testing fuels in thermal power plants section 6: fly ash and cinder combustible test method (DL/T567.6-2016).
Al 2 O 3 、CaO、SO 3 Content and total component analysis: method for analyzing coal ash components (GB/T1574-2007).
Example 1
Ash samples were analyzed during the operation of a 135MW circulating fluidized bed boiler in a plant. When the dust remover is an electric dust remover or an electric bag composite dust remover, the ash sample is collected from an ash bucket (namely the front part of an ash conveying bin pump) of the dust remover; or when the dust remover is a bag-type dust remover, the ash sample is collected from the rear part of the ash conveying bin pump (namely an ash bin) as it is, and the sampling mass is 500 g. The slag sample is sampled from a slag conveyer behind a slag cooler of the circulating fluidized bed boiler, and the sampling mass is 250 g. And mixing the ash sample and the slag sample according to the mass ratio of 2: 1, and sealing and storing by adopting a closed container.
Grinding the mixed ash sample to the granularity of less than 0.1mm by using a sealed grinder, then dividing the ground ash sample into 70g of ash analysis samples, and storing the ash analysis samples in a sealed container for later use. Determination of ash analysis sample combustible C, Al 2 O 3 CaO and SO 3 Content, measured as Al 2 O 3 51.41% of CaO, 2.23% of CaO and SO 3 The content is 0.95 percent, the content of combustible C is 4.22 percent, and the calculation is carried out by substituting the following components into a comprehensive discriminant formula (I):
q is more than or equal to 4.8, and the ash can be completely and directly used for extracting aluminum. The schematic diagram of the screening process of the aluminum extraction ash slag is shown in figure 1.
Example 2
Using the method of example 1, a sample of ash from a plant during operation of a 100MW circulating fluidized bed boiler was analyzed and Al was determined 2 O 3 42.78% CaO 6.79%, So 3 The content is 3.71 percent, the content of combustible C is 5.13 percent, and the calculation is carried out by substituting the following components into a comprehensive discriminant formula (I):
q is less than or equal to 3.6, and the ash is not suitable for aluminum extraction.
Example 3
Ash samples were analyzed during the operation of a 300MW circulating fluidized bed boiler in a plant using the method of example 1, the ash samples including desulfurization condition ash samples with limestone added to the furnace and non-desulfurization condition ash samples without limestone added.
Measuring the ash sample (Q) under the desulfurization condition 1 )Al 2 O 3 49.11% of CaO, 6.23% of CaO and SO 3 The content is 4.39%, and the content of combustible C is 4.33%; ash sample (Q) under non-desulfurising working condition 2 )Al 2 O 3 51.22% of CaO, 1.27% of SO 3 The content is 0.95 percent, and the content of combustible C is 5.66 percent.
Respectively substituting the general discriminant formula (I) for calculation:
the ash Q under the desulfurization condition 1 Less than or equal to 3.6, and is not suitable for aluminum extraction;
ash and slag Q under non-desulfurising working condition 2 Not less than 4.8, and can be completely and directly used for extracting aluminum.
Example 4
30 samples of ash collected randomly during the operation of a circulating fluidized bed boiler of a certain plant were analyzed by the method of example 1, and the results are shown in Table 1.
Comparative example 1
30 randomly collected ash samples of the circulating fluidized bed boiler of a certain plant in the embodiment 4 are analyzed by adopting a full-component analysis method, and finally, the sample Al is obtained according to an apparent activity parameter 2 O 3 The ash samples were screened for dissolution rate (typical value) and the results are shown in table 1.
TABLE 1
As can be seen from the above, the measurement result of the comparative example is more accurate, but the parameters to be measured are very many, the test period of the screening process of the aluminum extraction ash slag is long, and the analysis process is complex. The method is characterized in that the combustible and the components of the ash sample are analyzed and determined, and then the ash sample is substituted into the comprehensive discriminant formula (I), so that the screening result can be quickly obtained, the screening result is consistent with the comparative example, the reliability is high, the sampling and analyzing process is simple, and the use is convenient and quick.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The screening method for the aluminum extraction ash is characterized by comprising the following steps of:
step S1, collecting ash and slag samples including an ash sample original sample and a slag sample original sample;
step S2, preparing the ash into an ash analysis sample;
step S3, analyzing the ash slag for combustible substances C, Al in the sample 2 O 3 CaO and SO 3 Analyzing the content of the components;
step S4, substituting the content analysis result into the comprehensive discriminant formula (I) to calculate:
step S5, screening the ash slag according to the calculated Q value;
wherein Q is a screening index,
is Al 2 O 3 In mass percent of (b), w C Is the mass percentage content of combustible C, w CaO Is the weight percentage content of CaO,
is SO 3 The mass percentage of (A); when Q is less than or equal to 3.6, the ash is not used as an aluminum extraction raw material; when Q is more than 3.6, the ash is used as the aluminum extraction raw material.
2. The method of claim 1,
when Q is more than or equal to 4.8, independently taking the ash as the aluminum extraction raw material to extract aluminum; alternatively, the first and second electrodes may be,
and when Q is more than 3.6 and less than 4.8, mixing the ash with Q more than or equal to 4.8 to form the aluminum extraction raw material.
3. A process according to claim 1 or 2, wherein the ash is circulating fluidized bed boiler ash.
4. The method of any one of claims 1 to 3, wherein the ash sample is taken as is from a circulating fluidized bed boiler dust collector.
5. The method according to any one of claims 1 to 4, wherein when the dust collector is an electric dust collector or an electric bag composite dust collector, the ash sample is collected from the front part of an ash conveying bin pump as it is; or when the dust remover is a bag-type dust remover, the ash sample is collected from the rear part of the ash conveying bin pump.
6. The method according to any one of claims 1 to 5, wherein the slag sample is taken as such from a slag conveyor after a slag cooler of the circulating fluidized bed boiler.
7. The method according to any one of claims 1 to 6, wherein the ash sample has an as-received sampling mass of 400 to 600g and the slag sample has an as-received sampling mass of 200 to 300 g.
8. The process according to any one of claims 1 to 7, characterized in that the ash sample is mixed as such and the slag sample as such, obtaining the ash as such; preferably, the mass ratio of the original ash sample to the original slag sample in the original ash slag sample is (2-4): 1.
9. The method according to any one of claims 1 to 8, wherein the ash is ground as it is to a particle size of 0.1mm or less using a pulverizer, and then the ground ash is reduced to obtain 50 to 100g of the ash analysis sample.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101270412A (en) * | 2008-04-17 | 2008-09-24 | 上海交通大学 | Method for producing using aluminum gray and coal gangue composite castoff |
| CN101935174A (en) * | 2010-09-21 | 2011-01-05 | 浙江工商大学 | Method for improving mixing ratio of burning ash in cement raw materials |
| AU2012395690A1 (en) * | 2012-11-27 | 2015-06-11 | China Energy Investment Corporation Limited | Method for preparing soda-lime-silica glass basic formula and method for extracting aluminum from fly ash for co-production of glass |
| JP2019042624A (en) * | 2017-08-30 | 2019-03-22 | 太平洋セメント株式会社 | Coal ash treatment/physical distribution method |
| CN114456859A (en) * | 2022-01-17 | 2022-05-10 | 神华准格尔能源有限责任公司 | Preparation method of raw material coal water slurry rich in high-aluminum ash and preparation method of high-aluminum ash |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101270412A (en) * | 2008-04-17 | 2008-09-24 | 上海交通大学 | Method for producing using aluminum gray and coal gangue composite castoff |
| CN101935174A (en) * | 2010-09-21 | 2011-01-05 | 浙江工商大学 | Method for improving mixing ratio of burning ash in cement raw materials |
| AU2012395690A1 (en) * | 2012-11-27 | 2015-06-11 | China Energy Investment Corporation Limited | Method for preparing soda-lime-silica glass basic formula and method for extracting aluminum from fly ash for co-production of glass |
| JP2019042624A (en) * | 2017-08-30 | 2019-03-22 | 太平洋セメント株式会社 | Coal ash treatment/physical distribution method |
| CN114456859A (en) * | 2022-01-17 | 2022-05-10 | 神华准格尔能源有限责任公司 | Preparation method of raw material coal water slurry rich in high-aluminum ash and preparation method of high-aluminum ash |
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