CN117947279A - Method for improving leaching rate of gold ore - Google Patents
Method for improving leaching rate of gold ore Download PDFInfo
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- CN117947279A CN117947279A CN202410346771.XA CN202410346771A CN117947279A CN 117947279 A CN117947279 A CN 117947279A CN 202410346771 A CN202410346771 A CN 202410346771A CN 117947279 A CN117947279 A CN 117947279A
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- leaching
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- 238000002386 leaching Methods 0.000 title claims abstract description 150
- 239000010931 gold Substances 0.000 title claims abstract description 102
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 79
- 239000000463 material Substances 0.000 claims abstract description 36
- 230000035939 shock Effects 0.000 claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 16
- LUSWEUMSEVLFEQ-REOHCLBHSA-N (2s)-2-(carbamoylamino)propanoic acid Chemical compound OC(=O)[C@H](C)NC(N)=O LUSWEUMSEVLFEQ-REOHCLBHSA-N 0.000 claims abstract description 13
- HNDVDQJCIGZPNO-UHFFFAOYSA-N histidine Natural products OC(=O)C(N)CC1=CN=CN1 HNDVDQJCIGZPNO-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 13
- 239000011707 mineral Substances 0.000 claims abstract description 13
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 claims abstract description 12
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000012216 screening Methods 0.000 claims abstract description 11
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 claims abstract description 10
- 238000000227 grinding Methods 0.000 claims abstract description 9
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 238000001179 sorption measurement Methods 0.000 claims abstract description 8
- HNDVDQJCIGZPNO-YFKPBYRVSA-N L-histidine Chemical compound OC(=O)[C@@H](N)CC1=CN=CN1 HNDVDQJCIGZPNO-YFKPBYRVSA-N 0.000 claims abstract description 7
- 239000004471 Glycine Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 41
- 238000009826 distribution Methods 0.000 claims description 39
- 238000002347 injection Methods 0.000 claims description 22
- 239000007924 injection Substances 0.000 claims description 22
- 239000003463 adsorbent Substances 0.000 claims description 20
- 239000003610 charcoal Substances 0.000 claims description 18
- 238000004880 explosion Methods 0.000 claims description 15
- 239000007921 spray Substances 0.000 claims description 14
- 235000013162 Cocos nucifera Nutrition 0.000 claims description 13
- 244000060011 Cocos nucifera Species 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 12
- 235000009827 Prunus armeniaca Nutrition 0.000 claims description 6
- 244000018633 Prunus armeniaca Species 0.000 claims description 6
- 239000003245 coal Substances 0.000 claims description 6
- 240000007817 Olea europaea Species 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract description 2
- 230000008595 infiltration Effects 0.000 abstract 1
- 238000001764 infiltration Methods 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 description 15
- 239000002253 acid Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 150000001413 amino acids Chemical class 0.000 description 6
- 125000000031 ethylamino group Chemical group [H]C([H])([H])C([H])([H])N([H])[*] 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 150000001720 carbohydrates Chemical class 0.000 description 5
- KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000013329 compounding Methods 0.000 description 5
- 239000010419 fine particle Substances 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 4
- 229910052683 pyrite Inorganic materials 0.000 description 4
- 239000011028 pyrite Substances 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 239000003814 drug Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 229910021532 Calcite Inorganic materials 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 229910052951 chalcopyrite Inorganic materials 0.000 description 2
- DVRDHUBQLOKMHZ-UHFFFAOYSA-N chalcopyrite Chemical compound [S-2].[S-2].[Fe+2].[Cu+2] DVRDHUBQLOKMHZ-UHFFFAOYSA-N 0.000 description 2
- 230000000536 complexating effect Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- BBSSQDNRHCLISN-UHFFFAOYSA-N 2-butylnonanedioic acid Chemical compound CCCCC(C(O)=O)CCCCCCC(O)=O BBSSQDNRHCLISN-UHFFFAOYSA-N 0.000 description 1
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- SNPPWIUOZRMYNY-UHFFFAOYSA-N bupropion Chemical compound CC(C)(C)NC(C)C(=O)C1=CC=CC(Cl)=C1 SNPPWIUOZRMYNY-UHFFFAOYSA-N 0.000 description 1
- 229960001058 bupropion Drugs 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- -1 carboxyl anions Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000012633 leachable Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the technical field of mineral separation, in particular to a method for improving the leaching rate of gold ore. The method for improving the leaching rate of gold ore comprises the following steps: carrying out controllable shock wave and high-energy bundling bubble pretreatment on raw ore, and sequentially grinding and screening to obtain undersize and oversize; carrying out hydraulic classification treatment on the undersize to obtain overflow products and sand setting; leaching the overflow product with full mud; mixing oversize materials, settled sand and soda lime, stacking, and spraying leaching liquid by adopting a cyclone spraying pipeline positioned in the stacked ore to perform heap leaching to obtain gold-containing noble liquid; carrying out adsorption treatment on the gold-containing noble liquid to obtain gold-loaded carbon and lean liquid; wherein the leaching solution comprises the following components in percentage by mass (2.5-3.5): (0.5 to 1.5): (0.5 to 1.5): (0.5-1.5) aminocarbonylalanine, glycine, azelaic acid and histidine. The method of the invention improves the infiltration efficiency and leaching rate of gold ore.
Description
Technical Field
The invention relates to the technical field of mineral separation, in particular to a method for improving the leaching rate of gold ore.
Background
For low-grade refractory gold ores, leaching is one of the most widely used gold extraction methods at present. Because of the difficult treatability of the gold ores, ideal results are difficult to obtain by directly adopting the traditional crushing-grinding-leaching method.
Gold in the coated carbonaceous gold ore is generally small in particle size and most of the gold is coated in the sulphide ore and cannot be contacted with leaching liquid, and pretreatment is needed to open the inclusion so that gold can be leached after exposure. However, the conventional crushing treatment of gold minerals is not easy to expose, and a large amount of fine particles are generated, and the existence of the fine particles can seriously cover the surface of gold, block a leaching liquid channel and seriously influence the permeability of leaching liquid.
At present, the leaching solution is still mainly distributed in a manner of traditional dripping and spraying, so that a large amount of leaching solution is unevenly distributed, the medicament loss is large, and the permeation efficiency is low.
Therefore, the existing mechanical crushing and conventional dripping can not meet the requirements of heap leaching technology on the gold mineral exposure rate and the leaching liquid permeability.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to provide a method for improving the leaching rate of gold ore, which solves the problems of low gold ore permeation efficiency, low leaching rate, uneven leaching liquid distribution and large medicament loss in the prior art.
In order to achieve the above object of the present invention, the following technical solutions are specifically adopted:
the invention provides a method for improving the leaching rate of gold ore, which comprises the following steps:
S1, performing controllable shock wave pretreatment and high-energy bundling bubble pretreatment on raw ore to obtain pretreated materials;
S2, sequentially grinding and screening the pretreated material to obtain undersize and oversize; carrying out hydraulic classification treatment on the undersize to obtain overflow products and settled sand, and leaching the overflow products with full mud;
S3, mixing the oversize material, the settled sand and the soda lime, and then stacking to obtain a mineral pile; a cyclone injection pipeline is arranged in the ore heap, and the cyclone injection pipeline is adopted to spray leaching liquid for heap leaching of the ore heap to obtain gold-containing precious liquid; the gold-bearing noble liquid is adsorbed to obtain gold-bearing carbon and lean liquid;
Wherein the leaching solution comprises the following components in percentage by mass (2.5-3.5): (0.5 to 1.5): (0.5 to 1.5): (0.5-1.5) aminocarbonylalanine, glycine, azelaic acid and histidine.
Further, in step S1, the explosion energy of the electric pulse of the controllable shock wave pretreatment is 100-180 kj, and the explosion effect of the electric pulse is 10-15 times.
Further, in step S1, the voltage of the pretreatment of the high-energy bundling air bubbles is 195-205 v, the current is 5-15 a, and the action is 5-10 times.
Further, in step S1, the particle sizes of the feed materials for the controllable shock wave pretreatment and the high-energy bundling air bubble pretreatment are 40-80 mm.
In step S2, the size of the mesh used for screening is 3-6 mm.
Further, in the step S2, the particle content of the overflow product, of which the particle size is less than or equal to 0.074mm, is 70% -90%;
and/or the maximum granularity of the particles in the overflow product is 0.1-0.2 mm.
Further, in the step S3, adding the soda lime to the oversize material and the settled sand to adjust the pH of the system to 10-12.
Further, in step S3, the swirl injection pipeline includes a liquid distribution pipe and a nozzle disposed on the liquid distribution pipe;
the outer diameter of the liquid distribution pipe is 4-6 mm, and the inner diameter of the liquid distribution pipe is 2-3 mm; the liquid distribution pipes are transversely and longitudinally staggered, and the distance between adjacent liquid distribution pipes is 2-2.5 m;
the diameter of the inner opening of the nozzle is 3-4 mm, and the diameter of the outer opening is 1-2 mm.
Further, in step S3, the spraying strength is 0.5-1 mpa.
Further, in step S3, the adsorbent used in the adsorption treatment includes at least one of apricot kernel charcoal, coconut shell charcoal, olive kernel charcoal and spherical coal charcoal.
Compared with the prior art, the invention has the beneficial effects that:
1. According to the method for improving the leaching rate of gold ore, disclosed by the invention, the ore is pretreated by adopting a controllable shock wave and high-energy bundling bubble technology, so that the ore can be dissociated along a crystallization surface, a precise presplitting effect is achieved, the ore is quickly dissociated in the subsequent ore grinding process, and the generation of micro-fine particles is reduced; by paving a swirl injection pipeline in the heap and spraying the leaching solution by adopting the swirl injection pipeline, the leaching efficiency of the leaching solution is improved, and the consumption of the leaching solution is reduced; the leaching solution prepared by compounding the aminocarbonylalanine, the ethylamino acid, the bupropion acid and the histidine has better leaching effect and is environment-friendly.
2. The invention adopts controllable shock wave and high-energy cluster bubble technology, and is assisted with leaching liquid and cyclone spraying technology to carry out sectional recovery on refractory low-grade gold minerals, thereby improving the permeation efficiency and leaching rate of gold ores and further improving the recovery rate of gold in gold ores.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a nozzle of a swirl injection pipe according to the present invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described in conjunction with the specific embodiments, but it will be understood by those skilled in the art that the examples described below are some, but not all, examples of the present invention, and are intended to be illustrative only and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
In some embodiments of the invention there is provided a method of increasing the leaching rate of gold ore comprising the steps of:
S1, performing controllable shock wave pretreatment and high-energy bundling bubble pretreatment on raw ore to obtain pretreated materials;
s2, sequentially grinding and screening the pretreated material to obtain undersize and oversize; carrying out hydraulic classification treatment on the undersize to obtain overflow products and sand setting; leaching the overflow product with full mud;
S3, mixing the oversize material, the sand setting and the soda lime, and stacking to obtain a mineral pile; a cyclone injection pipeline is arranged in the ore heap, the cyclone injection pipeline is adopted to spray leaching liquid for heap leaching of the ore heap to obtain gold-containing noble liquid, and gold-loaded carbon and lean liquid are obtained after the gold-containing noble liquid is adsorbed;
Wherein the leaching solution comprises the following components in percentage by mass (2.5-3.5): (0.5 to 1.5): (0.5 to 1.5): (0.5-1.5) aminocarbonylalanine, glycine, azelaic acid and histidine.
In the method for improving the leaching rate of gold ore, the controllable shock wave and high-energy bundling bubble technology is adopted to pretreat the ore, and compared with the traditional crushing pretreatment technology, the method can enable the ore to be dissociated along a crystallization surface, has an accurate presplitting effect, enables the ore to be dissociated rapidly in the subsequent ore grinding process, and reduces the generation of micro-fine particles.
In the heap leaching process, the swirl injection pipeline is paved in the heap, and is adopted to spray the leaching solution, so that the leaching efficiency of the leaching solution is improved, and the consumption of the leaching solution is reduced.
The leaching solution is prepared by compounding aminocarbonylalanine, ethylamino acid, butyl azelaic acid and histidine, amino and carboxyl in molecules can be coordinated with Au to form a soluble complex, and the leaching effect is better, and the leaching solution is environment-friendly.
In some embodiments of the present invention, in step S1, the gold content of the raw ore is 0.3 to 0.48g/t. The metal minerals in the raw ore include pyrite and limonite, and the non-metal minerals include quartz and/or calcite.
In some embodiments of the present invention, in step S1, the electric pulse explosion energy of the controllable shock wave pretreatment is 100 to 180kj, and the electric pulse explosion effect is 10 to 15 times; typical but non-limiting, for example, the electrical pulse explosion energy may be 100KJ, 110KJ, 120KJ, 130KJ, 140KJ, 150KJ, 160KJ, 170KJ, 180KJ, or the like; the electric pulse explosion may be applied 10 times, 11 times, 12 times, 13 times, 14 times or 15 times.
The controllable shock wave technology is based on electric energy, energy is stored by an energy storage device, compressed and amplified by a power source and then released instantaneously in a strong pulse form, and high-intensity shock waves are generated to pretreat ores.
In some embodiments of the present invention, in step S1, the voltage of the pretreatment of the high-energy cluster bubbles is 195-205 v, the current is 5-15 a, and the actions are 5-10 times; typical but non-limiting voltages for high energy cluster bubble pre-treatment may be 195, 200V or 205V, for example; the current may be 5A, 7A, 9A, 10A, 12A, 13A, or 15A, etc.; can be applied 5 times, 8 times or 10 times, etc.
The high-energy bundling bubble technology is to disperse a gas into fine bubbles by using a high-pressure pulse or ultrasonic wave between the gas and the liquid, and then generate the high-energy bundling bubbles by controlling the generation, movement and collapse of the bubbles.
In some embodiments of the present invention, in step S1, the particle size of the feed material for the controllable shock wave pretreatment and the high-energy bundling air bubble pretreatment is 40-80 mm.
In the step S1 of the invention, after the raw ore is processed by the controllable shock waves, different cracks appear in different ores according to the characteristics of ore dissociation surfaces and the characteristics of the ore dissociation surfaces, and then under the action of high-energy bundling bubbles, the high-energy bubbles enlarge the ore cleavage surfaces according to the ore cracks, so that the ore is cracked, the energy consumption is reduced, and the green low-carbon ore cracking process is realized. If the sequence is exchanged, the high-energy cluster bubble pretreatment is carried out, and the bubbles cannot move along the cracks, so that the crushing capacity of the ore is reduced.
In some embodiments of the present invention, in step S2, the mesh size used for screening is 3-6 mm; preferably, the screening comprises using a wet vibrating screen.
In some embodiments of the invention, in step S2, the content of particles with the granularity less than or equal to 0.074mm in the fluid is 70% -90%;
the maximum particle size of the particles in the overflow product is 0.1-0.2 mm.
In some embodiments of the invention, in step S2, the whole mud leaching comprises: washing the adsorbent containing ore pulp after the overflow product is subjected to multi-step leaching in a leaching tank containing the adsorbent and the leaching agent, obtaining gold-containing noble liquid after gold removal operation (analysis treatment of the adsorbent), obtaining gold mud after zinc powder replacement, and smelting to obtain gold ingots; preferably, the adsorbent comprises coconut shell carbon and the leachable agent comprises sodium cyanide; in the step leaching process, the mass concentration of the leaching agent in the first leaching tank is 50% -55%, and the mass concentration of the leaching agent in the last leaching tank is 5%.
In some embodiments of the invention, in step S3, adding soda lime to the oversize and the settled sand to adjust the pH of the system to 10-12; preferably 11.
In some embodiments of the invention, the pile has a height of 5-7 m, a width of 5-7 m, and a length of 18-22 m.
Referring to fig. 1, in some embodiments of the present invention, in step S3, a swirl injection pipe includes a liquid distribution pipe and a nozzle provided on the liquid distribution pipe;
the outer diameter of the liquid distribution pipe is 4-6 mm, and the inner diameter of the liquid distribution pipe is 2-3 mm; the liquid distribution pipes are transversely and longitudinally staggered, and the distance between every two adjacent liquid distribution pipes is 2-2.5 m;
the diameter of the inner opening of the nozzle is 3-4 mm, and the diameter of the outer opening is 1-2 mm.
In some embodiments of the invention, in step S3, the interior of the nozzle is provided with an internal spiral; the screw pitch of the internal screw is 0.7-0.9 mm, and the screw height is 0.4-0.5 mm.
In some embodiments of the present invention, in step S3, 300 to 350 nozzles are disposed on two sides of the liquid distribution pipe.
In some embodiments of the present invention, in step S3, the leachate includes a mass ratio of (2.8-3.2): (0.8-1.2): (0.8-1.2): (0.8-1.2) aminocarbonylalanine, glycine, azelaic acid and histidine.
The amino groups in the leaching solution can realize ion exchange and form water-soluble compounds with gold, so that the leaching of gold is realized. By compounding the above components, the complexing effect of amino groups and gold can be increased, and the complexing of gold in the complex is realized through carboxyl anions (ionic bonds) and amino nitrogen (donor-acceptor bonds) in amino acids:
。
The leaching solution is favorable for the binding capacity of different types of amino acids through the compounding of the components, and because the partial oxidation processes of the amino acids are different, and meanwhile, the amino acids with different oxidation effects can generate amine with higher activity than gold in the reaction process, at the moment, the carbohydrate which can prevent gold from dissolving is easier to damage, because the carbohydrate does not participate in gold dissolving, but can generate metal sol in the presence of the carbohydrate, the gold dissolving is prevented, but the carbohydrate can promote the oxidation of the amino acids, so that the compounding can increase the content of the carbohydrate in the medicament, and the gold dissolving capacity of the amino acids is increased.
The leaching solution of the invention realizes a cyanide-free green leaching process and improves the leaching rate of gold.
In some embodiments of the invention, in step S3, the leachate is obtained by mixing aminocarbonylalanine, glycine, azelaic acid, histidine and water; the mass concentration of the leaching solution is 2% -10%.
In some embodiments of the present invention, in step S3, the spraying strength is 0.5 to 1mpa.
In some embodiments of the present invention, in step S3, the heap leaching time is 25 to 30 days; preferably 26 to 28 days.
In some embodiments of the present invention, in step S3, the adsorbent used in the adsorption treatment includes at least one of apricot kernel charcoal, coconut shell charcoal, olive kernel charcoal, and spherical coal charcoal.
In some embodiments of the invention, in step S3, the amount of adsorbent relative to the gold-containing pregnant solution is 50kg/m 3~100kg/m3.
In some embodiments of the present invention, in step S3, the lean solution is returned to the yard for recycling; for example, a lean solution may be used to formulate a leachate.
In some embodiments of the invention, in the method for improving the leaching rate of gold ore, the gold recovery rate (leaching rate of oversize and sand setting heap leaching) of the coarse fraction material is 85% -90%; the gold recovery rate (leaching rate of the overflow product full mud leaching) of the fine particle part is 95% -99%.
Example 1
The method for improving the leaching rate of gold ore provided by the embodiment comprises the following steps:
S1, performing controllable shock wave pretreatment on raw ore by a controllable shock wave generating device and using shock waves generated by electric pulse explosion, and performing high-energy bundling bubble pretreatment by a high-energy bundling bubble generating device to obtain pretreated materials;
the gold content in the raw ore is 0.30g/t, and the raw ore comprises pyrite, limonite and quartz;
The granularity of the feed subjected to controllable shock wave pretreatment and high-energy bundling bubble pretreatment is 40-80 mm;
the explosion energy of the electric pulse is 100KJ, and the electric pulse is applied for 10 times;
the voltage of the pretreatment of the high-energy cluster bubbles is 200V, the current is 5A, and the pretreatment is performed 5 times.
S2, after grinding the pretreated material, screening by adopting a wet vibrating screen with a screen mesh size of 3-6 mm to obtain undersize and oversize;
The undersize material enters hydraulic classification equipment for classification treatment to obtain overflow products and settled sand; the maximum granularity of the overflow product is 0.1-0.2 mm, and the content of the fraction of-0.074 mm is controlled at 75%;
The overflowed product is subjected to cascade leaching for 30 hours through a leaching tank containing coconut shell carbon and a leaching agent (sodium cyanide), wherein in the cascade leaching process, the mass concentration of the leaching agent in the first leaching tank is 50% -55%, and the mass concentration of the leaching agent in the last leaching tank is 5%, so that the coconut shell carbon containing ore pulp is obtained; washing coconut shell carbon containing ore pulp, resolving the adsorbent to obtain gold-containing noble liquid, replacing the gold mud with zinc powder, and smelting to obtain gold ingots.
S3, adding soda lime to the oversize material and the sediment to adjust the pH value of the system to 11, and then sending the system to a storage yard for stacking to obtain a mineral pile; a cyclone injection pipeline is arranged in the ore heap of the ore heap, the cyclone injection pipeline is adopted to spray leaching liquid for heap leaching, and the heap leaching time is 26 days, so that gold-containing noble liquid is obtained; carrying out adsorption treatment on the gold-containing noble liquid by adopting an adsorbent to obtain gold-loaded carbon and a lean solution, and returning the lean solution to a storage yard for recycling;
The height of the pile is 6m, the width is 6m, and the length is 20m; the swirl injection pipeline comprises a liquid distribution pipe and nozzles arranged at two sides of the liquid distribution pipe; the inner diameter of the liquid distribution pipe is 4mm, and the outer diameter is 2mm; the inner opening of the nozzle is 3mm, the outer opening is 1mm, the screw pitch is 0.7mm, and the screw height is 0.4mm; the cyclone spray pipes are transversely and longitudinally staggered, the length of each liquid distribution pipe is 20m, the distance between every two adjacent liquid distribution pipes is 2-2.5 m, and 300-350 nozzles are respectively arranged on two sides of each liquid distribution pipe;
the leachate comprises the following components in percentage by mass: 1:1:1, aminocarbonylalanine, ethylamino acid, buzelaic acid and histidine; the mass concentration of the leaching solution is 5%; the spray strength of the leaching solution is 0.5Mpa;
The adsorbent adopted in the adsorption treatment comprises apricot kernel charcoal and spherical coal charcoal; the amount of the adsorbent relative to the gold-containing noble liquid is 50kg/m 3.
Example 2
The method for improving the leaching rate of gold ore provided by the embodiment comprises the following steps:
S1, performing controllable shock wave pretreatment on raw ore by a controllable shock wave generating device and using shock waves generated by electric pulse explosion, and performing high-energy bundling bubble pretreatment by a high-energy bundling bubble generating device to obtain pretreated materials;
The gold content in the raw ore is 0.40g/t, and the raw ore comprises pyrite, chalcopyrite, quartz and calcite;
The granularity of the feed subjected to controllable shock wave pretreatment and high-energy bundling bubble pretreatment is 40-80 mm;
The explosion energy of the electric pulse is 140KJ, and the electric pulse is applied for 13 times;
the voltage of the pretreatment of the high-energy cluster bubbles is 200V, the current is 10A, and the pretreatment is performed 10 times.
S2, after grinding the pretreated material, screening by adopting a wet vibrating screen with a screen mesh size of 3-6 mm to obtain undersize and on-screen coarse grain;
the undersize material enters hydraulic classification equipment for classification treatment to obtain overflow products and settled sand; the maximum granularity of the overflow product is 0.1-0.2 mm, and the content of the fraction of-0.074 mm is controlled at 83%;
The overflowed product is subjected to cascade leaching for 28h through a leaching tank containing coconut shell carbon and a leaching agent (sodium cyanide), wherein in the cascade leaching process, the mass concentration of the leaching agent in the first leaching tank is 50% -55%, and the mass concentration of the leaching agent in the last leaching tank is 5%, so that the coconut shell carbon containing ore pulp is obtained; washing coconut shell carbon containing ore pulp, resolving the adsorbent to obtain gold-containing noble liquid, replacing the gold mud with zinc powder, and smelting to obtain gold ingots.
S3, adding soda lime to the oversize material and the sediment to adjust the pH value of the system to 11, and then sending the system to a storage yard for stacking to obtain a mineral pile; a cyclone injection pipeline is arranged in the ore heap, the cyclone injection pipeline is adopted to spray leaching liquid for heap leaching, and the heap leaching time is 26 days, so that gold-containing noble liquid is obtained; adsorbing the gold-containing noble liquid by using an adsorbent to obtain gold-loaded carbon and a lean solution, and returning the lean solution to a storage yard for recycling;
The height of the pile is 6m, the width is 6m, and the length is 20m; the swirl injection pipeline comprises a liquid distribution pipe and nozzles arranged at two sides of the liquid distribution pipe; the outer diameter of the liquid distribution pipe is 5mm, and the inner diameter is 3mm; the inner opening of the nozzle is 3mm, the outer opening is 1mm, the screw pitch is 0.8mm, and the screw height is 0.4mm; the cyclone spray pipes are transversely and longitudinally staggered, the length of each liquid distribution pipe is 20m, the distance between every two adjacent liquid distribution pipes is 2-2.5 m, and 300-350 nozzles are respectively arranged on two sides of each liquid distribution pipe;
the leachate comprises the following components in percentage by mass: 1:1:1, aminocarbonylalanine, ethylamino acid, buzelaic acid and histidine; the mass concentration of the leaching solution is 8%; the spray strength of the leaching solution is 0.8Mpa;
The adsorbent adopted in the adsorption treatment comprises apricot kernel charcoal and spherical coal charcoal; the amount of the adsorbent relative to the gold-containing noble liquid is 80kg/m 3.
Example 3
The method for improving the leaching rate of gold ore provided by the embodiment comprises the following steps:
S1, performing controllable shock wave pretreatment on raw ore by a controllable shock wave generating device and using shock waves generated by electric pulse explosion, and performing high-energy bundling bubble pretreatment by a high-energy bundling bubble generating device to obtain pretreated materials;
the gold content in the raw ore is 0.48g/t, and the raw ore comprises pyrite, chalcopyrite and quartz;
The granularity of the feed subjected to controllable shock wave pretreatment and high-energy bundling bubble pretreatment is 40-80 mm;
The explosion energy of the electric pulse is 180KJ, and the electric pulse acts 15 times;
the voltage of the pretreatment of the high-energy cluster bubbles is 200V, the current is 15A, and the pretreatment is performed 10 times.
S2, after grinding the pretreated material, screening by adopting a wet vibrating screen with a screen mesh size of 3-6 mm to obtain undersize and on-screen coarse grain;
The undersize material enters hydraulic classification equipment for classification treatment to obtain overflow products and settled sand; the maximum granularity of the overflow product is 0.1-0.2 mm, and the grain level content of-0.074 mm is controlled at 90%;
The overflowed product is subjected to cascade leaching for 30 hours through a leaching tank containing coconut shell carbon and a leaching agent (sodium cyanide), wherein in the cascade leaching process, the mass concentration of the leaching agent in the first leaching tank is 50% -55%, and the mass concentration of the leaching agent in the last leaching tank is 5%, so that the coconut shell carbon containing ore pulp is obtained; washing coconut shell carbon containing ore pulp, resolving the adsorbent to obtain gold-containing noble liquid, replacing the gold mud with zinc powder, and smelting to obtain gold ingots.
S3, adding soda lime to the oversize material and the sediment to adjust the pH value of the system to 11, and then sending the system to a storage yard for stacking to obtain a mineral pile; a cyclone injection pipeline is arranged in the ore heap, the cyclone injection pipeline is adopted to spray leaching liquid for heap leaching, and the heap leaching time is 28 days, so that gold-containing noble liquid is obtained; adsorbing the gold-containing noble liquid by using an adsorbent to obtain gold-loaded carbon and a lean solution, and returning the lean solution to a storage yard for recycling;
the height of the pile is 6m, the width is 6m, and the length is 20m; the swirl injection pipeline comprises a liquid distribution pipe and nozzles arranged at two sides of the liquid distribution pipe; the inner diameter of the liquid distribution pipe is 4mm, the outer diameter of the liquid distribution pipe is 2mm, the inner opening of the nozzle is 3mm, the outer opening of the nozzle is 1mm, the screw pitch is 0.7mm, and the screw height is 0.4mm; the cyclone spray pipes are transversely and longitudinally staggered, the length of each liquid distribution pipe is 20m, the distance between every two adjacent liquid distribution pipes is 2-2.5 m, and 300-350 nozzles are respectively arranged on two sides of each liquid distribution pipe;
The leachate comprises the following components in percentage by mass: 1:1:1, aminocarbonylalanine, ethylamino acid, buzelaic acid and histidine; the mass concentration of the leaching solution is 6%; the spray strength of the leaching solution is 1.0Mpa;
the adsorbent adopted in the adsorption treatment comprises apricot kernel charcoal and spherical coal charcoal; the amount of the adsorbent relative to the gold-containing noble liquid is 90kg/m 3.
Example 4
The method for improving the leaching rate of gold ore provided by the embodiment is referred to in embodiment 3, and is only different in that in step S1, the explosion energy of the electric pulse of the controllable shock wave pretreatment is 90KJ, and the effect is 5 times; the voltage for the pretreatment of the high-energy cluster bubbles is 220V.
Example 5
The method for improving the leaching rate of gold ore provided in this embodiment is different from that in the step S3, the leaching solution includes a mass ratio of 3.5:0.5:0.5:0.5 aminocarbonylalanine, ethylamino acid, buzelaic acid and histidine.
Comparative example 1
The leaching method of gold ore provided in this comparative example is different from that in the reference example 3 only in that in the step S1, the raw ore is crushed to obtain a pretreated material; in the step S3, a swirl injection pipeline is not arranged in the ore heap; the heap leaching time was 31 days.
Wherein the crushing step comprises the following steps: through the mechanical and physical effects, the particle size of the feed is below 10mm through physical striking of ores and coarse crushing and medium crushing; high energy consumption and high dust content.
Comparative example 2
The leaching method of gold ore provided in this comparative example is different from that in the step S3, the leaching solution includes a mass ratio of 3:1:1, aminocarbonylalanine, buzelaic acid and histidine; the mass concentration of the leaching solution is 6%; the spray strength of the leaching solution is 1.0Mpa.
Test example 1
The leaching rates and leaching liquid consumption of the heap leaching of the coarse fraction materials (oversize materials and sand setting) and the full mud leaching of the fine fraction materials (overflow materials) in examples 1 to 5 and comparative examples 1 to 2 are shown in table 1.
In table 1, the leachate heap leaching of coarse fraction material was used in an amount of leachate relative to 1 ton of crude ore; the amount of the leaching agent for full mud leaching of the fine fraction material is the amount of the leaching agent (sodium cyanide) relative to 1 ton of raw ore.
TABLE 1
As can be seen from Table 1, by adopting the controllable shock wave and high-energy cluster bubble and the process of paving the cyclone jet pipeline, the gold leaching rate of coarse fraction material after heap leaching can be improved from 70.11% to more than 85%, and the gold leaching rate of fine fraction material can be improved from 78.54% to more than 90%, so that the gold ore leaching rate is greatly improved, and the leaching liquid consumption is reduced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The method for improving the leaching rate of the gold ore is characterized by comprising the following steps of:
S1, performing controllable shock wave pretreatment and high-energy bundling bubble pretreatment on raw ore to obtain pretreated materials;
s2, sequentially grinding and screening the pretreated material to obtain undersize and oversize; carrying out hydraulic classification treatment on the undersize to obtain overflow products and sand setting; carrying out full mud leaching on the overflow product;
S3, mixing the oversize material, the settled sand and the soda lime, and then stacking to obtain a mineral pile; a cyclone injection pipeline is arranged in the ore heap, and the cyclone injection pipeline is adopted to spray leaching liquid for heap leaching of the ore heap to obtain gold-containing precious liquid; the gold-bearing noble liquid is adsorbed to obtain gold-bearing carbon and lean liquid;
Wherein the leaching solution comprises the following components in percentage by mass (2.5-3.5): (0.5 to 1.5): (0.5 to 1.5): (0.5-1.5) aminocarbonylalanine, glycine, azelaic acid and histidine.
2. The method for improving the leaching rate of gold ores according to claim 1, wherein in the step S1, the explosion energy of the electric pulse of the controllable shock wave pretreatment is 100-180 KJ, and the explosion action of the electric pulse is 10-15 times.
3. The method for improving the leaching rate of gold ores according to claim 1, wherein in the step S1, the high-energy cluster bubble pretreatment is performed for 5-10 times at a voltage of 195-205V and a current of 5-15A.
4. The method for improving the leaching rate of gold ores according to claim 1, wherein in step S1, the granularity of the feed materials for the controllable shock wave pretreatment and the high-energy bundling air bubble pretreatment is 40-80 mm.
5. The method for improving the leaching rate of gold ores according to claim 1, wherein in the step S2, the mesh size adopted by the screening is 3-6 mm.
6. The method for improving the leaching rate of gold ores according to claim 1, wherein in the step S2, the content of particles with the granularity less than or equal to 0.074mm in the overflow product is 70% -90%;
and/or the maximum granularity of the particles in the overflow product is 0.1-0.2 mm.
7. The method for improving the leaching rate of gold ores according to claim 1, wherein in the step S3, the pH of the soda lime adjustment system is 10-12, and the pH of the oversize product and the settled sand are added.
8. The method for improving the leaching rate of gold ore according to claim 1, wherein in the step S3, the cyclone spraying pipeline comprises a liquid distribution pipe and a nozzle arranged on the liquid distribution pipe;
the outer diameter of the liquid distribution pipe is 4-6 mm, and the inner diameter of the liquid distribution pipe is 2-3 mm; the liquid distribution pipes are transversely and longitudinally staggered, and the distance between adjacent liquid distribution pipes is 2-2.5 m;
the diameter of the inner opening of the nozzle is 3-4 mm, and the diameter of the outer opening is 1-2 mm.
9. The method for improving the leaching rate of gold ore according to claim 1, wherein in the step S3, the spraying strength is 0.5-1 mpa.
10. The method for increasing leaching rate of gold ore according to claim 1, wherein in step S3, the adsorbent used in the adsorption treatment comprises at least one of apricot kernel charcoal, coconut shell charcoal, olive kernel charcoal, and spherical coal charcoal.
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