CN114334032A - Method for evaluating mineralization and carbon sequestration potential of ore deposit - Google Patents
Method for evaluating mineralization and carbon sequestration potential of ore deposit Download PDFInfo
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Abstract
The invention discloses a method for evaluating the mineralization and carbon sequestration potential of an ore deposit, which comprises the following steps: exploring a selected mine to obtain a plurality of mineral samples, and recording azimuth information and element compositions of the representative samples; randomly selecting 8-32 representative samples from the samples, testing and measuring the element composition, the oxide composition, the mineral composition and the solid carbon content after accelerated carbonation of the representative samples, and determining the interconversion relationship among the parameters. The method can predict the oxide composition, the mineral composition and the carbon fixing potential of the sample from the element composition of the sample, thereby estimating the carbon fixing potential of the deposit according to the modeling of the drilling data and greatly reducing the manpower, material resources and financial resources of the experiment. The invention is suitable for the field of mineral resource utilization.
Description
Technical Field
The invention belongs to the field of mineral resource utilization, and particularly relates to a method for evaluating mineralization and carbon sequestration potential of an ore deposit.
Background
According to the annual book of environmental statistics of China published in 2019, the first three people in the world of 2011 of the annual emission of carbon dioxide are China, America and India respectively, wherein China is the first place, the annual emission reaches 901956 ten thousand tons, and compared with 1990, the annual emission is increased by 266.5%. The carbon source is wide in the production process of mines, large-scale equipment such as drilling, rock drilling and transportation is high in energy consumption, a large amount of greenhouse gas is released in the explosive blasting process, meanwhile, the vegetation around the plants are damaged in the mining process, carbon sink is reduced, and the mining enterprises face huge carbon emission reduction pressure.
The ore deposits of nickel ore, diamond ore, platinum group element ore, asbestos ore, etc. contain a large amount of CO2Silicate minerals required by the mineralization storage technology have great carbon fixation potential. CO 22The mineralization storage technology is characterized in that silicate containing Ca, Mg and Fe and CO are mixed under certain conditions2Reacting to form carbonate to achieve permanent storage of CO2The simplified chemical reaction equation of (a) is shown as follows: (Ca, Mg, Fe)2SiO4+2CO2→ 2(Ca,Mg,Fe)CO3+SiO2The method has the advantages of large carbon dioxide storage capacity, permanent stable carbon dioxide sealing without monitoring and the like. However, no method for accurately evaluating the mineralization and carbon sequestration potential of the ore bed exists so far, and the current situation greatly limits the CO of mine enterprises2The intensive research and utilization of mineralization storage technology.
Disclosure of Invention
The invention solves the technical problems of high mineral carbonation experiment cost, anisotropic mineral distribution of mineral deposits, low approximate calculation precision of the carbon sequestration potential of the traditional mineral deposits and the like, and provides a feasible path for realizing accurate carbon sequestration and reducing carbon emission pressure for mine enterprises.
In order to achieve the purpose, the invention provides the following technical scheme:
a method of mineral deposit mineralization carbon sequestration potential assessment, the method comprising:
s1: exploring a selected mine to obtain a plurality of mineral samples, and recording azimuth information and element composition of the representative samples; randomly selecting 8-32 representative samples from the samples, experimentally measuring the element composition, the oxide composition and the mineral composition of the representative samples, and determining the interconversion relationship among the compositions;
s2: respectively carrying out mineral pretreatment and accelerated carbonation on the representative sample to obtain the carbonation degree of the representative sample, and determining a carbonation reaction mechanism according to the carbonation degree;
s3: establishing a solid carbon amount prediction model of the representative sample, establishing a solid carbon amount prediction database according to the calculation result of the solid carbon amount prediction model, and adding a solid carbon amount prediction value to a drilling database laboratory analysis table;
s4: and (3) establishing a block model by adopting three-dimensional mining software according to the ore body entity model, assigning a predicted fixed carbon amount, and calculating reserves to obtain the fixed carbon potential of the ore deposit.
In step S1, the method for exploring the selected mine includes a probe slot or a borehole;
the analysis method of the element composition, the oxide composition and the mineral composition comprises one or more of ICP, X-ray fluorescence and X-ray diffraction.
As an embodiment of the present invention, in step S1, the elemental composition includes the content of one or more elements of Mo, Cu, Pb, Zn, Ag, Ni, Co, Mn, Fe, As, U, Au, Th, Sr, Cd, Sb, Bi, V, Ca, P, La, Cr, Mg, Ba, Ti, Al, Na, K, W, Zr, Sn, Y, Nb, Be, Sc, and S;
the oxide composition comprises: SiO 22、Al2O3、Fe2O3、CaO、MgO、Na2O、K2O、MnO、 TiO2、P2O5、Cr2O3And the content of one or more oxides of BaO;
the mineral composition comprises: olivine, serpentine, magnesium carbonate, quartz, diopside, brucite, magnetite, maghemite, brucite, trojanite, siderite and chlorite.
As an embodiment of the present invention, in step S1, the rule of interconversion between the components refers to: and respectively determining the conversion relation between the element composition and the oxide composition, the conversion relation between the oxide composition and the mineral composition and the conversion relation between the element composition and the mineral composition of the representative sample through an element mass conservation law.
As an embodiment of the present invention, in step S2, the mineral pretreatment method includes: one or more of thermal activation, chemical activation and mechanical force activation;
the method for accelerating carbonation comprises the following steps: one or more of direct dry carbonation, direct wet carbonation, indirect dry carbonation and indirect wet carbonation.
In step S2, the carbonation level is CO2Efficiency of sequestration reaction RXTo represent; wherein R isXThe calculation method of (2) is shown in the following formula (1):
wherein epsilonAIs the percentage of carbonate salt based on the total weight of the representative sample after all of the carbonatable metal cations in the representative sample have been converted to carbonate salt; x is the number ofCO2Is the CO in a representative sample after said accelerated carbonation2The weight percentage of (A); the epsilonAAnd xCO2Quantitative analysis is carried out on mineral composition of the material before and after accelerated carbonation;
optionally, the carbonatable metal cation comprises Mg2+，Ca2+、Fe2+、K+、Na+、Cu2+And Zn2+Preferably comprises Mg2+、Ca2+And Fe2+。
As an embodiment of the present invention, in step S3, establishing a fixed carbon amount prediction model for the representative sample includes: obtaining an oxide composition predicted value and a mineral composition predicted value of the representative sample according to the element composition and the conversion relation, and then determining a carbon fixation amount prediction model MCP of the representative sample according to the carbonation reaction mechanism;
the calculation method of the solid carbon quantity prediction model MCP is shown as the following formula (2):
wherein R isijThe carbonation conversion rate of the j mineral formed for the i carbonatable metal element, aijIs the mass percentage of the element in the j mineral formed by the ith carbonatable metal element, kijFor correction factors, determined by specific experiments;
optionally, the carbonatable metal elements include one or more of Mg, Ca, Fe, K, Na, Cu and Zn, preferably Mg, Ca and Fe.
As an embodiment of the present invention, in step S4, the three-dimensional mining software includes one or more of 3DMine, dimene, suppac, Datamine, Mineplan, and Vulcan, which have a three-dimensional geological information modeling function.
As an embodiment of the present invention, in step S4, the ore body solid model is defined according to the boundary grade of the mine primary mined ore in the laboratory analysis table of the drilling database.
In step S4, the assignment method includes one or more geostatistical models selected from the group consisting of inverse distance power law, ordinary kriging and pan-kriging;
the reserve calculation method includes: one or more of a section method, a number average method, a geological block method and a contour method.
The technical scheme provided by the invention at least brings the following beneficial effects:
(1) the method can predict the oxide composition, the mineral composition and the solid carbon content of the sample from the element composition of the sample, thereby estimating the solid carbon potential of the ore deposit according to the drilling data and greatly reducing the labor, physical and financial resources of the experiment;
(2) the method of the invention uses three-dimensional mining software to evaluate the carbon sequestration potential of the ore deposit, and obtains a result based on the modeling of mass exploration drilling data, the data source is reliable, and the estimation result is accurate;
(3) the method of the invention is based on the estimation of the grade of the ore deposit and the estimation of the reserve volume, and can be quickly mastered by technicians engaged in related industries, and the use is convenient;
(4) the method can adopt CO for mine enterprises by estimating the carbon sequestration potential of the deposit2The decision of the mineralization technology provides a reference.
Drawings
FIG. 1 is a technical roadmap for the present invention;
FIG. 2 is a comparison of MgO test and estimated values according to the present invention;
FIG. 3 is a graph showing the relationship between the consumption of olivine and the production of magnesite according to the present invention;
fig. 4 is a sectional view of a block model created by the mining software Surpac of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below.
Example 1
As shown in figure 1, the method of the invention is adopted to evaluate the mineralization and carbon sequestration potential of the ore deposit, and the specific method is as follows:
s1: taking a selected nickel ore As an example, exploring by adopting a drilling mode to obtain a plurality of mineral samples, recording the azimuth information of the mineral samples and the element compositions of Mo, Cu, Pb, Zn, Ag, Co, Mn, Ni, Fe, As, Sr, Cd, Sb, Bi, V, Ca, P, Cr, Mg, Ti, Al, Na, K, W, S, Au, Pt, Pd and the like; the deposit is found to be a multi-metal deposit, and the main valuable metals are: ni, Co, Fe. The deposit contains a large amount of Mg and is suitable for carbon sequestration;
selecting 16 representative samples from mineral samples at random, and determining element composition, oxide composition and mineral composition by adopting methods such as ICP (inductively coupled plasma), X-ray fluorescence, X-ray diffraction and the like: wherein, the element composition test content comprises: mo, Cu, Pb, Zn, Ag, Ni, Co, Mn, Fe, As, U, Au, Th, Sr, Cd, Sb, Bi, V, Ca, P, La, Cr, Mg, Ba, Ti, Al, Na, K, W, Zr, Sn, Y, Nb, Be, Sc, S, etc.; the oxide composition test contents comprise: SiO 22、Al2O3、Fe2O3、CaO、MgO、 Na2O、K2O、MnO、TiO2、P2O5、Cr2O3BaO, etc.; in addition, the loss on ignition, total carbon, total sulfur content was also tested. The mineral types in the mineral composition test results include: olivine, serpentine, magnesium carbonate, quartz, diopside, brucite, magnetite, maghemite, brucite, trojanite, siderite, clinopolite, etc.; wherein the test measurement of the elemental composition has an average test error of 8% for Mg and 7% for Fe, as the main elements, as compared with the measurements in the borehole database.
S2: determining the interconversion relationship among the elemental composition, the oxide composition and the mineral composition in step S1 by the law of conservation of elemental mass; comparing the oxide estimation result with the test result, wherein the estimation error is within 5% (shown in figure 2); the mineral composition estimation results were compared with the test results: the olivine estimation error is 12%, and the serpentine estimation error is 11%;
subjecting the representative sample of step S2 to mechanical force activation pre-treatment using a high energy pulverizer followed by accelerated carbonation using direct wet carbonation; the carbonation reaction is carried out in an autoclave at a temperature of 180 ℃ and CO2The partial pressure is 6.5MPa, the solid content is 30 percent, and the reaction time is 3 hours;
the carbonation levels of representative samples were calculated using the following formula (1),
wherein epsilonAIs the percentage of carbonate salt based on the total weight of the representative sample after all of the carbonatable metal cations in the representative sample have been converted to carbonate salt, the carbonatable metal cations comprising predominantly Mg2+，Ca2+And Fe2+；xCO2Is CO in the representative sample after accelerated carbonation2(ii) weight percent; the epsilonAAnd xCO2Quantitative analysis is carried out on the mineral composition of the material before and after accelerated carbonation; representative sample R of case minexThe value is between 5 and 45%.
The carbonation reaction mechanism determined according to the carbonation degree is as follows: olivine is the main carbonation mineral and serpentine promotes olivine carbonation. The relationship between olivine consumption and magnesite production is shown in fig. 3.
S3: the method comprises the steps that a sample solid carbon content prediction model is based on element compositions of Mg, Ca, Fe, K, Na, Cu, Zn and the like in mine drilling holes and the conversion relation obtained in the step S1, an oxide composition prediction value and a mineral composition prediction value of a representative sample are obtained, and then a solid carbon content prediction model MCP of the representative sample is determined according to a sample carbonation reaction mechanism; the calculation method of the carbon fixation quantity prediction model MCP is shown as the following formula (2):
wherein R isijCarbonation conversion of the j-th mineral formed for the i-th metal element, aijIs the mass percentage of the ith metal element in the jth mineral formed by the ith metal element, kijFor correction factors, determined by specific experiments; by comparison, MCP predicted value and test value (x) obtained by calculation according to formula (2)CO2) The error is within 5%.
S4: three-dimensional geological information modeling is carried out by using Surpac, an ore body entity model is defined according to 0.2% of boundary grade of Ni in drilling data, a conventional kriging method is adopted for block model prediction carbon fixation quantity assignment, and a section diagram of the block model after assignment is shown in a figure 4; finally, the reserves are calculated by a geological block method to obtain the deposit with the solid carbon content of 45 multiplied by 106t CO2。
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the subject matter of the invention is to be construed in all aspects and as broadly as possible.
Claims (10)
1. A method for assessing the mineralization and carbon sequestration potential of an ore deposit, the method comprising:
s1: exploring a selected mine to obtain a plurality of mineral samples, and recording azimuth information and element compositions of the representative samples; randomly selecting 8-32 representative samples from the samples, experimentally measuring the element composition, the oxide composition and the mineral composition of the representative samples, and determining the interconversion relationship among the compositions;
s2: respectively carrying out mineral pretreatment and accelerated carbonation on the representative sample to obtain the carbonation degree of the representative sample, and determining a carbonation reaction mechanism according to the carbonation degree;
s3: establishing a solid carbon amount prediction model of the representative sample, establishing a solid carbon amount prediction database according to a calculation result of the solid carbon amount prediction model, and adding a solid carbon amount prediction value to a drilling database laboratory analysis table;
s4: and (3) establishing a block model by adopting three-dimensional mining software according to the ore body entity model, assigning a predicted solid carbon amount, and calculating reserves to obtain the solid carbon potential of the ore deposit.
2. The method of claim 1, wherein in step S1, the method of exploration of the selected mine comprises a probe slot or borehole;
the analysis method of the element composition, the oxide composition and the mineral composition comprises one or more of ICP, X-ray fluorescence and X-ray diffraction.
3. The method according to claim 1, wherein in step S1, the elemental composition includes the content of one or more elements of Mo, Cu, Pb, Zn, Ag, Ni, Co, Mn, Fe, As, U, Au, Th, Sr, Cd, Sb, Bi, V, Ca, P, La, Cr, Mg, Ba, Ti, Al, Na, K, W, Zr, Sn, Y, Nb, Be, Sc, and S;
the oxide composition comprises: SiO 22、Al2O3、Fe2O3、CaO、MgO、Na2O、K2O、MnO、TiO2、P2O5、Cr2O3And the content of one or more oxides of BaO;
the mineral composition comprises: one or more minerals selected from olivine, serpentine, magnesium carbonate, quartz, diopside, brucite, magnetite, maghemite, brucite, trojanite, siderite and chlorite.
4. The method according to claim 1, wherein in step S1, the rule of interconversion between the components is: and respectively determining the conversion relation between the element composition and the oxide composition, the conversion relation between the oxide composition and the mineral composition and the conversion relation between the element composition and the mineral composition of the representative sample through an element mass conservation law.
5. The method according to claim 1, characterized in that in step S2, the mineral pretreatment method comprises: one or more of thermal activation, chemical activation and mechanical activation;
the method for accelerating carbonation comprises the following steps: one or more of direct dry carbonation, direct wet carbonation, indirect dry carbonation and indirect wet carbonation.
6. The method of claim 1Method, characterized in that in step S2, the carbonation level is CO2Efficiency of sequestration reaction RXTo represent; wherein R isXThe calculation method of (2) is shown in the following formula (1):
wherein epsilonAIs the percentage of carbonate salt based on the total weight of the representative sample after all of the carbonatable metal cations in the representative sample have been converted to carbonate salt; x is the number ofCO2Is the CO in a representative sample after said accelerated carbonation2The weight percentage of (A); the epsilonAAnd xCO2Quantitative analysis is carried out on the mineral composition of the material before and after accelerated carbonation;
optionally, the carbonatable metal cation comprises Mg2+、Ca2+、Fe2+、K+、Na+、Cu2+And Zn2+Preferably comprises Mg2+、Ca2+And Fe2+。
7. The method of claim 1, wherein in step S3, establishing a fixed carbon prediction model for the representative sample comprises: obtaining an oxide composition predicted value and a mineral composition predicted value of the representative sample according to the element composition and the conversion relation, and then determining a carbon fixation amount prediction model MCP of the representative sample according to the carbonation reaction mechanism;
the calculation method of the solid carbon quantity prediction model MCP is shown as the following formula (2):
wherein R isijThe carbonation conversion rate of the j mineral formed for the i carbonatable metal element, aijMinerals of the j-th type formed for the i-th carbonatable metal elementThe mass percent of the element (c), kijFor correction factors, determined by specific experiments;
optionally, the carbonatable metal elements include one or more of Mg, Ca, Fe, K, Na, Cu and Zn, preferably Mg, Ca and Fe.
8. The method according to claim 1, wherein in step S4, the three-dimensional mining software comprises one or more of 3DMine, dimene, suppac, Datamine, Mineplan, and Vulcan mining software with three-dimensional geological information modeling function.
9. The method of claim 1, wherein in step S4, the ore body solid model is delineated according to the boundary grade of mine primary mined minerals in a drill hole database laboratory sheet.
10. The method of claim 1, wherein in step S4, the assignment method includes one or more geostatistical models selected from inverse distance power ratio, ordinary kriging and pan-kriging;
the reserve calculation method comprises the following steps: one or more of a section method, a number average method, a geological block method, a contour method and the like.
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| CN117405718A (en) * | 2023-12-12 | 2024-01-16 | 山东石油化工学院 | Quantitative evaluation method for carbon sequestration capacity of magma calcium element based on XRF scanning |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117405718A (en) * | 2023-12-12 | 2024-01-16 | 山东石油化工学院 | Quantitative evaluation method for carbon sequestration capacity of magma calcium element based on XRF scanning |
| CN117405718B (en) * | 2023-12-12 | 2024-02-13 | 山东石油化工学院 | Quantitative evaluation method for carbon sequestration capacity of magma calcium element based on XRF scanning |
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