CN114317944A - Method for treating micro-fine particle dip-dyeing type refractory gold concentrate through oxygen-enriched mechanical activation - Google Patents
Method for treating micro-fine particle dip-dyeing type refractory gold concentrate through oxygen-enriched mechanical activation Download PDFInfo
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- CN114317944A CN114317944A CN202210020614.0A CN202210020614A CN114317944A CN 114317944 A CN114317944 A CN 114317944A CN 202210020614 A CN202210020614 A CN 202210020614A CN 114317944 A CN114317944 A CN 114317944A
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- oxygen
- micro
- fine particle
- enriched
- gold concentrate
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 239000010931 gold Substances 0.000 title claims abstract description 61
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 38
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 29
- 239000001301 oxygen Substances 0.000 title claims abstract description 29
- 239000012141 concentrate Substances 0.000 title claims abstract description 28
- 239000010419 fine particle Substances 0.000 title claims abstract description 24
- 238000004043 dyeing Methods 0.000 title claims abstract description 16
- 238000004137 mechanical activation Methods 0.000 title claims abstract description 9
- 230000003647 oxidation Effects 0.000 claims abstract description 26
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 26
- 238000000227 grinding Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 7
- 229910052569 sulfide mineral Inorganic materials 0.000 claims description 4
- 238000002386 leaching Methods 0.000 abstract description 22
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 17
- 239000011707 mineral Substances 0.000 abstract description 17
- 238000003723 Smelting Methods 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000010008 shearing Methods 0.000 abstract description 3
- 238000010494 dissociation reaction Methods 0.000 abstract description 2
- 230000005593 dissociations Effects 0.000 abstract description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 abstract 1
- 229910001882 dioxygen Inorganic materials 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
- 229910052717 sulfur Inorganic materials 0.000 description 6
- 239000011593 sulfur Substances 0.000 description 6
- 229910052964 arsenopyrite Inorganic materials 0.000 description 5
- MJLGNAGLHAQFHV-UHFFFAOYSA-N arsenopyrite Chemical compound [S-2].[Fe+3].[As-] MJLGNAGLHAQFHV-UHFFFAOYSA-N 0.000 description 5
- 229910052683 pyrite Inorganic materials 0.000 description 4
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 4
- 239000011028 pyrite Substances 0.000 description 4
- 229910052785 arsenic Inorganic materials 0.000 description 3
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 3
- 230000001580 bacterial effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 241001354491 Lasthenia californica Species 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- GOLCXWYRSKYTSP-UHFFFAOYSA-N arsenic trioxide Inorganic materials O1[As]2O[As]1O2 GOLCXWYRSKYTSP-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- 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
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a method for treating micro-fine particle dip-dyeing type refractory gold concentrate by oxygen-enriched mechanical activation, which comprises the steps of carrying out ultra-fine grinding on the micro-fine particle dip-dyeing type gold concentrate, mixing ore pulp and enriched oxygen, introducing the mixture into a pump shell, scattering the enriched oxygen gas by using the vigorous stirring of an impeller blade to form micro-fine bubbles to enhance the dissolved oxygen degree of the ore pulp, and simultaneously generating high shearing force to strip a precipitation layer on the surface of the mineral to accelerate the oxidation of the mineral after the ultra-fine grinding, thereby destroying the self lattice structure of the mineral, increasing the dissociation degree of the gold mineral, further improving the leaching rate in the subsequent cyaniding process, and realizing the high-efficiency smelting recovery of the micro-fine particle dip-dyeing type refractory gold concentrate. The leaching rate of gold in ore pulp after the pretreatment is greatly improved.
Description
Technical Field
The invention relates to the technical field of gold cyaniding smelting, in particular to a method for treating micro-fine particle dyeing type gold concentrate.
Background
In the micro-fine particle leaching type gold ore, gold-containing minerals are generally distributed in minerals such as pyrite, arsenopyrite and the like in a micro-fine particle mode or exist in mineral crystal lattices in a form of 'isomorphism' and the like; this type of gold ore belongs to refractory gold ore, and even if ultra-fine grinding is adopted, the degree of dissociation of gold is improved as much as possible, and an ideal leaching recovery rate cannot be obtained. However, with the gradual decrease of the easily smelted gold ore resources, the development of the micro-fine particle impregnated gold ore gradually becomes the key direction of the technical research in the gold field.
The problems of micro-fine particle package and 'class homography' are the main reasons of low leaching rate of micro-fine particle leaching type gold ores, so that the original lattice structures of arsenopyrite, pyrite, arsenopyrite and other minerals need to be fully destroyed to fully dissociate the gold minerals, and the leaching recovery rate of gold is improved. At present, the mature pretreatment process for micro-fine particle dip-dyeing type gold ore in industry mainly comprises roasting oxidation, bacterial oxidation, high-pressure oxidation and the like, and the processes destroy gold-loaded minerals and original lattice structures thereof by an oxidation method, so that the gold minerals are fully dissociated.
The roasting oxidation process is to convert sulfide into oxidized mineral in oxidizing atmosphere to destroy crystal lattice and produce great amount of SO2And the like, and when treating arsenic-containing gold ores, the arsenic-containing gold ores can also bring As2O3The pollution problem of (2); although the development of dust collecting and purifying equipment improves the environmental pollution problem. However, under the current environment of energy conservation and emission reduction, the restriction of the oxidizing roasting process is more and more obvious. Therefore, the process must be eliminated.
The bacterial oxidation pretreatment technology is to oxidize pyrite, arsenopyrite and other sulfide ores through microorganisms, compared with roasting oxidation, the production environment of the process is good, but the process has the defects of overlong treatment period, difficult bacterial culture, large influence of regional environment change, arsenic wastewater pollution and the like, and the production cost is high, so that the large-scale application of the process is limited.
The pressure oxidation method is a process of oxidizing sulfides in a high-pressure environment to destroy the structure of gold-loaded minerals such as pyrite and arsenopyrite, thereby exposing the encapsulated gold particles. However, the equipment for pressure oxidation needs high pressure resistance, the equipment investment and the operation cost are high, and in addition, the difficulty in treating the acidic wastewater generated by the acidic pressure oxidation is high, so that the process becomes an obstacle to large-scale popularization. Therefore, the development of a low-cost, high-efficiency and harmless treatment process of the micro-fine particle dyeing type gold concentrate is imperative.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for treating micro-fine particle leaching type refractory gold concentrate by oxygen-enriched mechanical activation, realizing low cost, high efficiency and harmlessness of micro-fine particle leaching type gold concentrate pre-oxidation treatment, and laying a foundation for greatly improving the leaching rate of gold.
The technical scheme of the invention is as follows: a method for treating micro-fine particle dip-dyeing type refractory gold concentrate by oxygen-enriched mechanical activation is characterized by comprising the following steps:
(1) superfine grinding the micro-fine particle dip-dyeing type gold concentrate, wherein the particle size of P90 is less than 15 microns;
(2) enabling the ore pulp obtained in the step (1) to circularly flow in a stirring barrel and an external centrifugal pump shell, introducing oxygen enrichment into the external centrifugal pump shell, and fully mixing the oxygen enrichment with the ore pulp in the pump shell to form micro oxygen enrichment bubbles; the treatment is circulated until the oxidation rate of the gold-bearing sulfide mineral reaches more than 60 percent.
Preferably, the rotating speed of the external centrifugal pump is not lower than 2000 r/min.
Preferably, the concentration of the gold concentrate ore pulp is not more than 35%, and the volume ratio of the ore pulp to the oxygen-enriched volume is (12-7): 1.
Preferably, the pH value of the ore pulp in the treatment process is controlled to be 4.0-8.0.
Compared with the prior art, the invention has the following characteristics:
the invention utilizes the superfine mill to mill the microfine particle dip-dyeing type gold concentrate to the fineness P90 less than 15 mu m, the reduction of the gold concentrate particle size can obviously improve the subsequent reaction activity, the sulfide minerals can be effectively oxidized and decomposed, simultaneously, the strong shearing stirring provided by the impeller blades can effectively reduce or eliminate the passivation effect formed by the oxidation products, and the Fe (OH) is avoided3、CaSO4The oxidation products are attached to the surface of the mineral; the technical measures can obviously improve the surface activation of the minerals, ensure that the oxidation of the sulfide minerals can be smoothly and efficiently carried out, and realize the efficient oxidation of the micro-fine particle dyeing type gold concentrate.
The impeller blade can also fully break up the oxygen-enriched bubbles in the ore pulp while providing strong shearing, and the oxygen-enriched microbubbles are shaped, so that the contact area of the ore pulp and oxygen is increased, the mass transfer speed and the dissolved oxygen amount in the ore pulp are improved, the oxidation speed of the sulfurized minerals is greatly accelerated, the fast decomposition of the sulfurized minerals is further promoted, and the efficient pre-oxidation treatment of the micro-fine particle impregnated gold concentrate is realized.
Experiments show that compared with the conventional cyanidation leaching process for extracting gold, the leaching rate of the gold in the ore pulp after the pretreatment is greatly improved.
Detailed Description
The present invention will be further described with reference to examples, comparative examples and comparative experimental results.
In the following examples and comparative examples, the ultrafine-grained dip-dyed gold concentrate was first subjected to an ultrafine grinding treatment, the P90 particle size being less than 15 μm, the specific particle size being as required in each example.
Comparative example 1
2kg of used micro-fine particle dyeing type gold concentrate, the fineness P90 of 12 mu m, the gold content of 29.80g/t and the effective sulfur content of 27.48 percent; the sample is not subjected to any pre-oxidation treatment, the conventional cyanidation leaching process is directly adopted for smelting, and the highest leaching rate of gold is not more than 65%.
Example 1 (an example of the process of the invention)
2kg of the same fine particle-impregnated gold concentrate as in comparative example 1 was subjected to adjustment of pulp concentration to 30%, pH 7.0 + -0.2, and temperature 80 ℃ to cause the pulp to flow in a circulating manner between the mixing tank and the pump casing of the external centrifugal pump, and the pulp flow rate was about 0.8m3H; oxygen enrichment (oxygen purity is 90 +/-1%) is introduced into a feed pipe of the centrifugal pump, and the oxygen flow is about 0.1m3H; and regulating the pH value in the oxidation process by adopting CaO, and sampling for cyaniding leaching after 7 hours of pretreatment.
Through determination: after 7 hours of pretreatment, the effective sulfur content of the sample is reduced to 8.26 percent, and the oxidation rate of sulfur reaches 69.94 percent; extracting gold from the pretreated ore pulp by adopting a conventional cyaniding leaching process, and determining: the highest leaching rate of gold reaches 87.48 percent.
Comparative example 2
2kg of used micro-fine particle dip-dyeing type gold concentrate, the fineness P80 of 9 mu m, the gold content of the gold concentrate is 31.27g/t, and the effective sulfur content is 36.55%; the sample is not subjected to any pre-oxidation treatment, the conventional cyanidation leaching process is directly adopted for smelting, and the highest leaching rate of gold is not more than 60%.
Example 2 (an example of the process of the invention)
2kg of the same micro-fine particle impregnated gold concentrate as the comparative example 2 was subjected to adjustment of pulp concentration to 25%, pH 4.5. + -. 0.2, and temperature 85 ℃ to cause the pulp to circulate between the mixing tank and the pump casing of the external centrifugal pump at a pulp flow rate of about 0.9 m3H; oxygen enrichment (oxygen purity is 90 +/-1%) is introduced into a feed pipe of the centrifugal pump, and the oxygen flow is about 0.1m3H; and regulating the pH value in the oxidation process by adopting CaO, and sampling for cyaniding leaching after 7 hours of pretreatment.
Through determination: after 7 hours of pretreatment, the effective sulfur content in the sample is reduced to 14.30 percent, and the oxidation rate of sulfur reaches 60.88 percent; extracting gold from the pretreated ore pulp by adopting a conventional cyaniding leaching process, and determining: the highest leaching rate of gold reaches 89.15%.
Claims (4)
1. A method for treating micro-fine particle dip-dyeing type refractory gold concentrate by oxygen-enriched mechanical activation is characterized by comprising the following steps:
(1) superfine grinding the micro-fine particle dip-dyeing type gold concentrate, wherein the particle size of P90 is less than 15 microns;
(2) enabling the ore pulp obtained in the step (1) to circularly flow in a stirring barrel and an external centrifugal pump shell, introducing oxygen enrichment into the external centrifugal pump shell, and fully mixing the oxygen enrichment with the ore pulp in the pump shell to form micro oxygen enrichment bubbles; the treatment is circulated until the oxidation rate of the gold-bearing sulfide mineral reaches more than 60 percent.
2. The method for oxygen-enriched mechanical activation treatment of micro-fine particle-impregnated refractory gold concentrate according to claim 1, wherein the method comprises the following steps: the rotating speed of the external centrifugal pump is not lower than 2000 r/min.
3. The method for oxygen-enriched mechanical activation treatment of micro-fine particle-impregnated refractory gold concentrate according to claim 1, wherein the method comprises the following steps: the concentration of the gold concentrate ore pulp is not more than 35%, and the volume ratio of the ore pulp to the oxygen-enriched volume is (12-7): 1.
4. The method for oxygen-enriched mechanical activation treatment of micro-fine particle-impregnated refractory gold concentrate according to claim 1, wherein the method comprises the following steps: the pH value of the ore pulp is controlled to be 4.0-8.0 in the treatment process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210020614.0A CN114317944A (en) | 2022-01-10 | 2022-01-10 | Method for treating micro-fine particle dip-dyeing type refractory gold concentrate through oxygen-enriched mechanical activation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210020614.0A CN114317944A (en) | 2022-01-10 | 2022-01-10 | Method for treating micro-fine particle dip-dyeing type refractory gold concentrate through oxygen-enriched mechanical activation |
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| CN114317944A true CN114317944A (en) | 2022-04-12 |
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| CN202210020614.0A Pending CN114317944A (en) | 2022-01-10 | 2022-01-10 | Method for treating micro-fine particle dip-dyeing type refractory gold concentrate through oxygen-enriched mechanical activation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115679115A (en) * | 2022-09-29 | 2023-02-03 | 贵州大学 | Green and efficient pretreatment method for enhancing gold extraction of superfine dip-dyeing type gold ore |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060133974A1 (en) * | 2004-12-22 | 2006-06-22 | Placer Dome Technical Services Limited | Reduction of lime consumption when treating refractory gold ores or concentrates |
| CN102925716A (en) * | 2012-11-26 | 2013-02-13 | 云南黄金矿业集团股份有限公司 | Pressurization, water immersion and oxidation preprocessing cyaniding gold extraction method for difficult-processing gold concentrates |
| CN210945734U (en) * | 2019-11-18 | 2020-07-07 | 山东黄金矿业科技有限公司选冶实验室分公司 | Oxidation pretreatment reaction device |
| CN113802013A (en) * | 2021-09-28 | 2021-12-17 | 山东黄金矿业科技有限公司选冶实验室分公司 | Oxygen-enriched ultrasonic pre-oxidation treatment method for micro-fine particle dyeing type gold concentrate |
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2022
- 2022-01-10 CN CN202210020614.0A patent/CN114317944A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060133974A1 (en) * | 2004-12-22 | 2006-06-22 | Placer Dome Technical Services Limited | Reduction of lime consumption when treating refractory gold ores or concentrates |
| CN102925716A (en) * | 2012-11-26 | 2013-02-13 | 云南黄金矿业集团股份有限公司 | Pressurization, water immersion and oxidation preprocessing cyaniding gold extraction method for difficult-processing gold concentrates |
| CN210945734U (en) * | 2019-11-18 | 2020-07-07 | 山东黄金矿业科技有限公司选冶实验室分公司 | Oxidation pretreatment reaction device |
| CN113802013A (en) * | 2021-09-28 | 2021-12-17 | 山东黄金矿业科技有限公司选冶实验室分公司 | Oxygen-enriched ultrasonic pre-oxidation treatment method for micro-fine particle dyeing type gold concentrate |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115679115A (en) * | 2022-09-29 | 2023-02-03 | 贵州大学 | Green and efficient pretreatment method for enhancing gold extraction of superfine dip-dyeing type gold ore |
| CN115679115B (en) * | 2022-09-29 | 2024-04-26 | 贵州大学 | Green efficient pretreatment method for strengthening gold extraction of fine dip-dyed gold ore |
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