CN113552311A - Method for analyzing gold content of gold-containing ore sample - Google Patents
Method for analyzing gold content of gold-containing ore sample Download PDFInfo
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- CN113552311A CN113552311A CN202110671968.7A CN202110671968A CN113552311A CN 113552311 A CN113552311 A CN 113552311A CN 202110671968 A CN202110671968 A CN 202110671968A CN 113552311 A CN113552311 A CN 113552311A
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 126
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 126
- 239000010931 gold Substances 0.000 title claims abstract description 126
- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000005484 gravity Effects 0.000 claims abstract description 71
- 239000012141 concentrate Substances 0.000 claims abstract description 35
- 238000004458 analytical method Methods 0.000 claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 238000000926 separation method Methods 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 9
- 238000005303 weighing Methods 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 claims description 9
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 238000007796 conventional method Methods 0.000 abstract description 6
- 238000005070 sampling Methods 0.000 abstract description 4
- 239000000523 sample Substances 0.000 description 49
- 238000004364 calculation method Methods 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 5
- 238000000227 grinding Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 239000010970 precious metal Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229910052949 galena Inorganic materials 0.000 description 2
- XCAUINMIESBTBL-UHFFFAOYSA-N lead(ii) sulfide Chemical compound [Pb]=S XCAUINMIESBTBL-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910052683 pyrite Inorganic materials 0.000 description 2
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 2
- 239000011028 pyrite Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910052950 sphalerite Inorganic materials 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000000538 analytical sample Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052951 chalcopyrite Inorganic materials 0.000 description 1
- DVRDHUBQLOKMHZ-UHFFFAOYSA-N chalcopyrite Chemical compound [S-2].[S-2].[Fe+2].[Cu+2] DVRDHUBQLOKMHZ-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- PQTCMBYFWMFIGM-UHFFFAOYSA-N gold silver Chemical compound [Ag].[Au] PQTCMBYFWMFIGM-UHFFFAOYSA-N 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- -1 low content Chemical compound 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 229920001021 polysulfide Polymers 0.000 description 1
- 239000005077 polysulfide Substances 0.000 description 1
- 150000008117 polysulfides Polymers 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
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- 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
- G01N33/20—Metals
- G01N33/202—Constituents thereof
- G01N33/2028—Metallic constituents
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
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Abstract
The invention discloses an analysis method of gold content of a gold-containing ore sample, which comprises the steps of crushing and weighing the gold-containing ore sample to be tested, then sorting gravity concentrate and gravity tailings by gravity separation equipment, respectively analyzing the gold content of the gravity concentrate and the gravity tailings by a gold content detection method, and determining the gold content of the gold-containing ore sample after processing the results of the gravity concentrate and the gravity tailings; and the gravity concentration concentrate is used for detecting the gold content of the fire-assaying method by the weight suitable for detection of the fire-assaying method. The invention avoids the division process step, enlarges the sampling range of the gold-bearing ore sample to be detected, and ensures that the detection result is accurate and real. Since gold ore has a relatively low gold content and is scattered in the ore unlike other ores, it is difficult to obtain a representative detection result if the existing detection method is used. The positive deviation and the negative deviation of the detection result of the conventional method represented by the embodiment of the invention are respectively 16-38% and 9-18%, and compared with the existing detection method, the method of the invention can reduce the data fluctuation by 75% at most.
Description
Technical Field
The invention relates to the technical field of ore content analysis, in particular to a method for analyzing gold content of a gold-containing ore sample.
Background
The gold content is extremely low in nature, so that the representativeness and uniformity in the preparation process of the gold-containing sample analysis sample are difficult to ensure. This property of gold-containing ores makes the analytical results of current detection methods less reproducible. Finally, the grade of the gold-containing ore sample cannot be accurately measured, and gold mine exploration or comprehensive evaluation work of the gold-containing mine is difficult to guide in time, so that the situation is a bottleneck problem which puzzles the gold-containing mine to find the ore for a long time.
The preparation of analytical samples during the testing of gold-containing mineral samples was in accordance with the "quality management regulations for geological mineral laboratory tests" (DZ/T0130.2-2006), which was first released and implemented in 1994. The standard indicates that the processing flow of guiding the gold-containing ore sample is as follows: coarse crushing the sample by a jaw crusher, crushing the sample in a disc machine until the whole sample is screened by 20-40 meshes, inspecting bright gold on the screen, uniformly mixing the sieved sample with the bright gold, performing condensation separation, taking 500-1000 g of the mixture, and repeatedly crushing the mixture by the disc machine until the granularity reaches 200 meshes.
Due to the characteristics of gold, particularly low content, the preparation of the analysis sample containing the gold ore by adopting the flow has difficulty in obtaining a representative gold ore sample for analysis. The reason is as follows: on one hand, because the gold-containing ore sample needs to be reduced after being crushed to a certain granularity, and because the gold content is relatively extremely low and the natural gold particles are relatively randomly distributed in the reduction process, the representative gold ore sample is difficult to obtain through reduction; on the other hand, the reduced gold-containing ore sample is finely ground into an analysis sample, but the analysis test of gold only needs to take 10-20 g, the sampling amount is small, and a representative analysis sample is difficult to obtain in consideration of the relatively random distribution of natural gold particles.
Therefore, a representative analysis sample cannot be prepared in the preparation process of the analysis sample before the test of the gold-containing ore sample, and the gold grade detected by subsequent analysis cannot accurately represent the real grade of the gold-containing ore sample.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to solve the technical problems of inaccurate detection result caused by extremely low gold content of the gold-containing ore sample, scattered distribution and incapability of truly representing the gold content of the ore sample in the prior art and provide an analysis method of the gold content of the gold-containing ore sample.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
the method for analyzing the gold content of the gold-containing ore sample comprises the steps of crushing, grinding and weighing the gold-containing ore sample to be tested, then sorting gravity concentrate and gravity tailings by gravity separation equipment, analyzing the gold content of the gravity concentrate and the gravity tailings by a gold content detection method respectively, and determining the gold content of the gold-containing ore sample after processing the results of the gravity concentrate and the gravity tailings; and the gravity concentration concentrate is used for detecting the gold content of the fire-assaying method by the weight suitable for detection of the fire-assaying method.
Preferably, the weight of the gravity concentrate is 60-100 g.
Preferably, the weight of the gravity concentrate is 80-90 g.
Preferably, the gold-containing ore sample to be detected is completely crushed to-2 mm.
Preferably, the crushed sample further comprises a sample ground to-0.074 mm, and accounts for 60-80% of the total weight of the ore sample.
Preferably, the sorting parameter of the gravity separation device (KC-MD3 Nielsen centrifugal separator) comprises a gravity value of 60m/s2The water amount is 2.6-3.0L/min, and the ore feeding amount is 500-700 g/min.
Preferably, the amount of the fed ore and the amount of the discharged ore of the gravity concentration equipment are respectively 1-20kg of the ore feeding amount of one test, and the amount of the gravity concentrate after the separation is 60-100 g.
Preferably, the gold content of the gravity tailings is determined by a conventional wet type condensation separation method.
Preferably, the gold content results of the gravity concentrate and the gravity tailings after detection are processed in a mode of the proportion of each component.
Preferably, the processing result is processed in a weighted manner, and the formula is as follows:
wherein alpha is the gold content of the gold-containing ore sample; g1To reselect the weight of the concentrate; beta is a1The analysis result of the gold content of the gravity concentrate is obtained; beta is a2The analysis result of the gold content of the gravity tailings is obtained; g is the total weight of the gold-containing ore sample.
Compared with the prior art, the invention has the following beneficial effects:
in the invention, the gold content of the gravity concentrate and the gravity tailings is analyzed by a gold content detection method respectively, wherein the gravity concentrate is used for detecting the gold content of the fire-assaying method by the weight suitable for the detection of the fire-assaying method. Compared with the prior art, the method avoids the process step of division, enlarges the sampling range of the gold-containing ore sample to be detected, and ensures that the detection result can truly represent the gold content of the selected ore. Since gold ore has a relatively low gold content and is scattered in the ore unlike other ores, it is difficult to obtain a representative detection result if the existing detection method (wet division) including the method in the national standard is used. In fact, the positive deviation and the negative deviation of the detection result of the existing detection method are respectively 16-38% and 9-18%, and compared with the existing detection method, the method provided by the invention can reduce the data fluctuation by 75% at most.
The invention will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a process flow diagram of a preferred embodiment of the present invention.
Detailed Description
The present invention is further explained and illustrated by the following embodiments, which should be understood to make the technical solution of the present invention clearer and easier to understand, and not to limit the scope of the claims.
Crushing 1-20kg of bright gold-containing samples to be analyzed and detected to about-2 mm, weighing and recording as G, and grinding the weighed-2 mm samples to about-0.074 mm, wherein the sample accounts for 60-80%; feeding the ore pulp containing the bright gold sample after ore grinding into a KC-MD3 Nielsen ore dressing machine for dressing, and respectively obtaining gravity concentrate and gravity tailings, wherein the Nielsen dressing parameters are as follows: the gravity G value is 60, the water amount is 2.6-3.0L/min, and the ore feeding amount is 500-700G/min; drying and weighing G gravity concentrate obtained after sorting1Grinding all samples to be below-0.074 mm, performing wet reduction on gravity tailings for multiple times by using a wet sample separator, and drying any one part of gravity tailings to be below-0.074 mm; performing gold content analysis on all prepared gravity concentrate samples by a fire gold testing method, and recording the gold analysis result as beta1(ii) a The prepared gravity tailings are subjected to gold content analysis by a conventional method, and the analysis result of gold is recorded as beta2(ii) a According to the formula α ═ G1*β1+(G-G1)*β2) And calculating the content alpha value of the gold in the bright gold-containing sample.
The KC-MD3 Nielsen centrifugal concentrator is an intensified gravity concentration test device based on a centrifugal principle. In a high power enhanced gravity field, the difference in gravity between heavy and low specific gravity minerals is greatly amplified, which makes separation between light and heavy minerals easier than in a natural gravity field. The method is suitable for recovering gold, silver, platinum group and other precious metals from ores and other solid materials, and has the characteristics of high beneficiation-enrichment ratio, high production efficiency, easiness in operation and management and the like. The sample amount of the ore of the KC-MD3 Nielsen centrifugal concentrator in one test can be selected within 1-20kg, which can greatly meet the general sample feeding weight of the bright gold sample, and the gravity concentration (which should be selected by utilizing gravity) after the separation is generally between 60-100 g, which can meet the sampling amount of the fire-assaying method.
The processing and expression mode of the result is not limited to the weighting calculation formula, and data processing can be performed on different ores and different scenes by drawing a chart, a curve and the like. For example, if the method is used for ores with small ore content fluctuation and basically stable data, the result processing can be carried out in a form of a table or an empirical curve; and (4) for the ores with unstable ore content or exploratory mining ores, performing result processing by adopting a calculation mode of a weighting formula.
The present invention will be further illustrated by the following specific examples.
Example 1
The content of other metal minerals except natural gold containing noble metal in a certain lean sulfide gold ore is extremely low, an analysis sample is prepared by adopting a conventional method, and the content of gold is detected by repeating 15 times, wherein the content of gold is between 24.09 and 29.92g/t, the average value is 27.04g/t, and the deviation is between-10.91 percent and 16.50 percent. By adopting the method, 1-7kg of samples with any weight are respectively ground until the weight of-0.074 mm accounts for 80 percent, and after being separated by a Nielsen separator, gravity concentrate and gravity tailings are separated according to a formula of alpha (G)1*β1+(G-G1)*β2) And the calculation is carried out on the/G, 8 times of experiments show that the content of the gold is between 25.68 and 30.87G/t, the average grade is 28.28G/t, and the deviation is between-9.19 percent and 6.22 percent.
Example 2
Except natural gold containing noble metal, the polysulfide gold ore has high sulfur content, an analysis sample is prepared by a conventional method, and the gold content is detected by repeating 13 times, wherein the gold content is between 1.22 and 2.1g/t, the average value is 1.72g/t, and the deviation is between-29.20 percent and 21.88 percent. By adopting the method, 1-7kg of samples with any weight are respectively ground until the weight of-0.074 mm accounts for 50 percent, and after being separated by a Nielsen separator, gravity concentrate and gravity tailings are separated according to a formula of alpha (G)1*β1+(G-G1)*β2) The calculation of the content of gold is 1.6-1.98G/t, the average grade is 1.78G/t, the deviation is-10.28-12.15%, the preparation method of the gold-containing ore sample analysis sample is applied, and the gold of the gold-containing ore is obtained by 12 times of experimentsThe analysis result deviation is obviously reduced.
Example 3
Besides containing precious metal silver gold ore and natural gold, some gold-containing polymetallic ores have higher contents of metal minerals pyrite, galena and sphalerite. The analysis sample is prepared by a conventional method, and the content of gold is detected by repeating the detection for 21 times, wherein the content of gold is between 5.74 and 9.48g/t, the average value is 7.43g/t, and the deviation is between-22.76 and 37.26 percent. By adopting the method, 1-7kg of samples with any weight are respectively ground until the weight of-0.074 mm accounts for 75 percent, and after being separated by a Nielsen separator, gravity concentrate and gravity tailings are separated according to a formula of alpha (G)1*β1+(G-G1)*β2) And the calculation is carried out on the/G, 13 times of experiments show that the content of the gold is between 6.99 and 10G/t, the average grade is 8.59G/t, and the deviation is between-18.60 percent and 16.45 percent.
Example 4
Besides containing precious metal silver and gold, the gold-bearing polymetallic ore contains high-content pyrite, galena, sphalerite and chalcopyrite. The analysis sample is prepared by a conventional method, and the content of the gold is detected for 16 times, wherein the content of the gold is between 7.32 and 28.6g/t, the average value is 13.11g/t, and the deviation is between-38.35 and 62.52 percent. By adopting the method, 1-7kg of samples with any weight are respectively ground until the weight of-0.074 mm accounts for 75 percent, and after being separated by a Nielsen separator, gravity concentrate and gravity tailings are separated according to a formula of alpha (G)1*β1+(G-G1)*β2) And the calculation is carried out on the/G, 13 times of experiments show that the content of the gold is between 9.25 and 14.82G/t, the average grade is 11.67G/t, and the deviation is between-20.73 and 27.01 percent.
The results of the experimental analyses of examples 1 to 4 are shown in Table 1 below.
TABLE 1 test results of examples 1-4
The data show that the gold-containing sample has good representativeness and uniformity, the Nielsen concentrator separates the whole concentrate sample to detect the content of gold, the content of bright gold is accurately quantified, and the content of gold obtained by weighting and calculating the beneficiated concentrate and tailings according to the grade and the weight improves the analysis accuracy of gold.
While the present invention has been described by way of examples, and not by way of limitation, other variations of the disclosed embodiments, as would be readily apparent to one of skill in the art, are intended to be within the scope of the present invention, as defined by the claims.
Claims (10)
1. A method for analyzing the gold content of a gold-containing ore sample is characterized by comprising the following steps:
crushing and weighing a gold-containing sample to be detected, then separating gravity concentrate and gravity tailings by gravity separation equipment, analyzing the gold content of the gravity concentrate and the gravity tailings by a gold content detection method respectively, and determining the gold content of the gold-containing sample after the results of the gravity concentrate and the gravity tailings are processed; and the gravity concentration concentrate is used for detecting the gold content of the fire-assaying method by the weight suitable for detection of the fire-assaying method.
2. The method of claim 1, wherein the method comprises the steps of:
the weight of the gravity concentrate is 60-100 g.
3. The method of claim 2, wherein the method comprises the steps of:
the weight of the gravity concentrate is 80-90 g.
4. The method of claim 1, wherein the method comprises the steps of:
and crushing the gold-containing ore sample to be detected to-2 mm.
5. The method of claim 1, wherein the method comprises the steps of:
the crushed sample is ground to-0.074 mm, and accounts for 60-80% of the total weight of the ore sample.
6. The method of claim 1, wherein the method comprises the steps of:
the sorting parameter of the reselection equipment comprises a gravity value of 60m/s2The water amount is 2.6-3.0L/min, and the ore feeding amount is 500-700 g/min.
7. The method of claim 1, wherein the method comprises the steps of:
the sample feeding amount and the sample discharging amount of the gravity concentration equipment are respectively 1-20kg of the ore feeding amount of one test, and 60-100 g of the gravity concentration concentrate amount after the separation.
8. The method of claim 1, wherein the method comprises the steps of:
and determining the gold content of the gravity tailings by a conventional wet type condensation separation method.
9. The method of claim 1, wherein the method comprises the steps of:
and the gold content results of the gravity concentrate and the gravity tailings after detection are processed in a mode of the proportion of each component.
10. The method of claim 9, wherein the analysis of the gold content of the gold-containing ore sample comprises:
the processing result is processed in a weighting mode, and the formula is as follows:
α＝(G1*β1+(G-G1)*β2)/G
wherein alpha is the gold content of the gold-containing ore sample; g1To reselect the weight of the concentrate; beta is a1The analysis result of the gold content of the gravity concentrate is obtained; beta is a2The analysis result of the gold content of the gravity tailings is obtained; g is the total weight of the gold-containing ore sample.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114264681A (en) * | 2021-12-29 | 2022-04-01 | 清华大学 | Method and system for analyzing gold ore grade |
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| CN114264681A (en) * | 2021-12-29 | 2022-04-01 | 清华大学 | Method and system for analyzing gold ore grade |
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