CN105506272A - Pelletizing method suitable for heap leaching of gold ores - Google Patents
Pelletizing method suitable for heap leaching of gold ores Download PDFInfo
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- CN105506272A CN105506272A CN201510920717.2A CN201510920717A CN105506272A CN 105506272 A CN105506272 A CN 105506272A CN 201510920717 A CN201510920717 A CN 201510920717A CN 105506272 A CN105506272 A CN 105506272A
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- ore
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0002—Preliminary treatment
- C22B15/0004—Preliminary treatment without modification of the copper constituent
- C22B15/0008—Preliminary treatment without modification of the copper constituent by wet processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B23/00—Obtaining nickel or cobalt
- C22B23/005—Preliminary treatment of ores, e.g. by roasting or by the Krupp-Renn process
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/04—Extraction of metal compounds from ores or concentrates by wet processes by leaching
- C22B3/06—Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions, e.g. with acids generated in situ; in inorganic salt solutions other than ammonium salt solutions
- C22B3/08—Sulfuric acid, other sulfurated acids or salts thereof
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
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- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention belongs to the field of metallurgy and mineral engineering, and discloses a pelletizing method suitable for heap leaching of gold ores. According to the method, certain amount of a binding agent is added into crushed cores and ore fines or gold concentrates which are small in grain size and are not suitable for direct heap leaching, a circular disk pelletizer is used for pelletizing, and the rotation speed, the moisture adding amount, the pelletizing time of the pelletizer are controlled in a pelletizing process, so that block mass with a relatively great grain size and various good performance indexes such as compressive strength, dropping strength, leaching strength and the like is finally prepared. The pelletized ore balls are uniform in grain size, and are relatively good in strength, so that the permeability of a stock heap is greatly improved, a leaching agent solution can be distributed more uniformly, and can be in contact with ores more sufficiently, and therefore, the leaching time is shortened, and the gold leaching rate is increased. According to the current condition that gold demand is increasing fiercely, world high-quality gold resource is increasingly exhausted and low-grade refractory gold ores become main raw materials for gold extraction, the method undoubtedly has a wide application prospect today. The method also can be applied to the field of pelletizing and heap leaching of minerals such as copper, nickel-cobalt, and the like.
Description
Technical field
The invention belongs to metallurgical and Mineral Engineering field, a kind of granulation technique being suitable for gold mine fine ore is provided, obtain meeting some strength and the perviousness of piling in ore deposit, the agglomerate being conducive to Gold leaching can be improved, making the technological method that the dump leaching gold-extracting of a large amount of low-grade gold and barren rock is achieved.
Background technology
When directly carrying out dump leaching containing shale composition or the high ore of Pulverization ratio, the leaching velocity of gold is slow, and leaching yield is low.Granulation technique is that solution ore is high containing mud, the effective means of Pulverization ratio height dump leaching weak effect.From the eighties in 20th century, u.s. gold mine just adopts pretreatment of granulation technology in a large number, is even also used those containing the very not high ore of mud, and its main purpose shortens leaching cycle by granulating, and enhances productivity.China applies this technology from the nineties in 20th century, and achieves gratifying effect.At present, granulating process has been used among Lateritic Soil, altered rock-type, argillization breccia type, GOSSAN TYPE GOLD ORE ore and mine tailing dump leaching.
Snake room Gold Mine is domestic Lateritic Gold Deposit maximum at present.This ore deposit starts to adopt granulating and heap-leaching technique for 1994, and at present, year process ore amount more than 1,000,000 tons, produce more than gold 1t per year, the leaching yield of gold is 81.2%, and the rate of recovery reaches 76%.Also have Qinglong, Guizhou county old ten thousand Lateritic Gold Deposit, the Yunnan Menhai Lateritic Gold Deposit etc. identical with snake room Gold Mine all have employed granulating and heap-leaching technique.Hunan Longwang gold mine altered rock type deposit stone adopts granulating and heap-leaching art breading, and the leaching yield of gold is 86.21%, and the rate of recovery is 78.92%.This is compared with conventional dump leaching, and the leaching yield of gold improves 20% ~ 30%; Leaching cycle shortens 1/2 ~ 2/3; Consumption of sodium cyanide reduces 60%.Guangxi Long Tang gold mine ore is high clay matter altered rock type deposit stone.This ore deposit adopts cyaniding solution to granulate, cement consumption 15kg/t, and set time, 24h, entered to pile gold grade 0.9 ~ 1.9g/t, tailings grade 0.16 ~ 0.25g/t, and the leaching yield of gold is greater than 85%, extraction time 40 ~ 45d, year process ore amount few hundred thousand tonnes of.Comparatively early adopt match all gold mine, the Kanguer gold deposits etc. also having Xinjiang of granulating and heap-leaching process altered rock type deposit stone.From the nineties in 20th century, the many Carlin-type gold ore oxidized ores being in Gui Dian Golden Triangle, Guizhou Province all have employed granulating and heap-leaching technology because argillization is serious at heap leaching process, and this band is that granulating and heap-leaching technology applies area the most general.Iron cap gold ores is often because degree of oxidation is high, and silt content is large and be difficult to dump leaching.Jiangxi iron cap gold ores; jaw crusher is adopted to be crushed to-60mm; then rotary kiln is adopted to carry out drying; use disk pelletizing mechanism grain again; heap built by rotary conveyor; after granulating, the leaching yield of gold brings up to 77% from 65.4% compared with not granulating, and the production cycle shortens to 45d by original 50d, and sodium cyanide consumption is reduced to 0.74kg/t by 0.84kg/t.Nanjing soup Gold Mine adopts granulating and heap-leaching art breading argillization breccia type gold deposit stone, and lime consumption 12kg/t, cement consumption 5 ~ 8kg/t, the leaching yield of gold brings up to 91% from original 12%, and extraction time shortens nearly 30d.
The binding agent that several method of granulating of above-mentioned and other current existence use is cement and lime, the method is applicable to alkaline leaching system, and when under acidic leaching system condition, often the intensity of ore particle is not high, and when so only leaching does not complete, some ore particle is just broken, the perviousness causing ore deposit to be piled declines, leaching yield also just declines thereupon, and extraction time can extend, and does not also exist at present and can make with gold ore to be the granulation technique of raw material.
In China, large size Au deposit is few a few days ago, when resource is relatively not rich, research and develop new granulation technique by for China's gold ore resource make full use of and synthetical recovery opens up a new way.
Summary of the invention
The present invention is effective method of granulating of a kind of gold mine raw ore serious for efflorescence and gold ore granulating and heap-leaching; the method is by adding a certain amount of binding agent in muck that is little to granularity, that be not suitable for direct leaching in dumps and fine ore or gold ore; utilize disk pelletizing mechanism grain; nodulizer rotating speed, moisture addition, Granulation time is controlled in pelletization; finally make granularity comparatively large, the agglomerate that the property indices such as ultimate compression strength, dropping strength, leaching intensity are good.Ore deposit ball globule size after granulation is even, and intensity is better, and the perviousness that ore deposit is piled is greatly improved, and leaching agent solution can be more evenly distributed, and contacts more abundant, thus shortens extraction time, improve the leaching yield of gold with ore deposit.
The present invention takes following technical scheme: a kind of method of granulating being applicable to heap leaching of gold ores, and the method specifically comprises the following steps:
Step 1: choose fine ore respectively and particle diameter is 100-300 object grain ore deposit or gold ore, will choose an ore deposit and fine ore is that 1:1 takes respectively according to mass ratio;
Step 2: first the grain ore deposit of granulation is first joined in disk pelletizing machine, the inclination angle of rotating disk is that 46-52 ° of rotating disk rotates with certain rotating speed, and add water-wet, when soaking for the first time, amount of water is 20ml/kg; After surface, grain ore deposit complete wetting in nodulizer, more at the uniform velocity add fine ore and binding agent in disk, simultaneously even to ore particle surface sprinkling spray water xi, make fine ore be bonded on an ore deposit, finally obtain the ore particle that particle diameter is 10-15cm.
Further, in described step 2, binding agent add-on is 0.5 ~ 1.5% of fine ore and grain mineral amount summation.
Further, described binding agent is cement and polyacrylamide, and mass ratio is therebetween 2:1.
Further, described to the water yield in the process of ore particle surface sprinkling spray water xi be 140ml ~ 160ml/kg.
Further, the rotating speed of described step 2 turntable is 40-60rpm.
Further, the ultimate compression strength of described ore particle is more than 300N, and leaching yield is more than 85%.
The invention has the beneficial effects as follows: owing to adopting technique scheme, the granularity made by the method is comparatively large, the agglomerate that the property indices such as ultimate compression strength, dropping strength, leaching intensity are good.Ore deposit ball globule size after granulation is even, and intensity is better, and the perviousness that ore deposit is piled is greatly improved, and leaching agent solution can be more evenly distributed, and contacts more abundant, thus shortens extraction time, improve the leaching yield of gold with ore deposit.Directly will solve the bottleneck problem of dump leaching, and surge in current gold demand amount, world's high-quality gold ore resource is day by day exhausted, today that low-grade intractable gold mine becomes the main raw material carrying gold has broad application prospects undoubtedly; The method also can be applicable to the granulating and heap-leaching field of the mineral such as copper, nickel cobalt.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of breeze raw material of the present invention.
Fig. 2 is the shaping schematic view of the different binding agents adopting different ratio.Fig. 2 A is 2% gypsum; Fig. 2 B is 2% polyacrylamide; Fig. 2 C is 2% wilkinite; Fig. 2 D is 2% cement; Fig. 2 E is 1% gypsum+1% lime, and Fig. 2 F is 1% cement+1% polyacrylamide.
Embodiment
Below in conjunction with specific embodiment, technical scheme of the present invention is described further.
Embodiment:
Be grain ore deposit and fine ore proportioning by suitable pelletizing parameter be 1:1, when soaking for the first time, amount of water is 20ml/kg, amount of water 140 ~ 160mL/kg ore deposit after moistening, the granulation best bond agent added and best bond agent proportioning are the binder mixture that interpolation mass ratio 0.5 ~ 1.5% cement and 0.5 ~ 1.0% polyacrylamide form.
(1) muck is granulated to test and is carried out in the lab, and facility for granulating is disk pelletizing machine, and disk diameter is 0.6m, and inclination angle is 50 degree, and rotating speed is 50rpm.Granulation raw material choose granularity be ore within the scope of 6-15mm as the skeleton of granulating, the ore of below 6mm is finely ground to granularity-0.074mm through ball mill and accounts for about 80%.Select cement, polytetrafluoro acrylamide to join in fine ore as binding agent by 1:1 mixing to granulate, the uniform particle sizes of obtained ore particle, then Performance Detection is carried out to the ore particle after granulation, show that the ultimate compression strength of ore particle is 393.86N, dropping strength (secondary/(0.5m)) is 8.3 times, leaching intensity is 89%, and water-intake rate is that 3.36% properties such as grade integrates optimum.
(2) the 10kg ore particle made joined in synthetic glass post leach, first add in ore pillar sulphuric acid soln adjustment pH, the pH of 20g/L stable after add superoxol again preoxidation carried out to ore particle.Non cyanide process agent thiocarbamide, result extraction time is very fast, and after approximately leaching 14d, the leaching yield of gold just reaches about 85%.
Be illustrated in figure 2 adopt without condensing agent different mass ratio carry out Performance Detection to often organizing the ore particle after granulation, obtain a result as (1) ultimate compression strength A:67.87N, B:148.19N, C:99.62N, D:125.42N, E:196.58N, F:393.86N; (2) dropping strength (secondary/(0.5m)) A:2.8, B:9.5, C:3.7, D:3.5, E:4.2, F:8.3; (3) leach intensity: the spherolite sample got after appropriate solidification is placed in transparent post, carries out leaching strength test in three stages, at set intervals, adds the aqueous solution, the sulfuric acid of 20g/L concentration, the sulphuric acid soln of 50g/L concentration respectively.After each leaching stage, detect and do not disintegrate spherolite number and calculate per-cent, do not disintegrate the leaching intensity (or wet tenacity) that per-cent that spherolite accounts for primary sample sum is sample.
In the first stage, B, D pelletizing sample is all intact, and C sample surface has occurred that a small amount of breeze comes off, and A sample is then just thoroughly disintegrated at the test initial stage;
In subordinate phase, the D sample amount of disintegrating is no more than 5%, B sample has about 8% to disintegrate, and the sample major part of A, C is disintegrated, and undercapacity is to complete leaching process;
Phase III, D sample still has more than 90% complete, and B sample major part then starts to occur distortion, cracking;
The leaching intensity of E sample is poor, and F sample leaching strength ratio B sample will be got well, only slightly poor than D sample.
Claims (6)
1. be applicable to a method of granulating for heap leaching of gold ores, it is characterized in that, the method specifically comprises the following steps:
Step 1: choose fine ore respectively and particle diameter is 100-300 object grain ore deposit or gold ore, will choose an ore deposit and fine ore is that 1:1 takes respectively according to mass ratio;
Step 2: first the grain ore deposit of granulation is first joined in disk pelletizing machine, the inclination angle of rotating disk is that 46-52 ° of rotating disk rotates with certain rotating speed, and add water-wet, when soaking for the first time, amount of water is 20ml/kg; After surface, grain ore deposit complete wetting in nodulizer, more at the uniform velocity add fine ore and binding agent in disk, simultaneously even to ore particle surface sprinkling spray water xi, make fine ore be bonded on an ore deposit, finally obtain the ore particle that particle diameter is 10-15cm.
2. method of granulating according to claim 1, is characterized in that, in described step 2, binding agent add-on is 0.5 ~ 1.5% of fine ore and grain mineral amount summation.
3. method of granulating according to claim 1, is characterized in that, described binding agent is cement and polyacrylamide, and mass ratio is therebetween 2:1.
4. method of granulating according to claim 1, is characterized in that, described to the water yield in the process of ore particle surface sprinkling spray water xi be 140ml ~ 160ml/kg.
5. method of granulating according to claim 1, is characterized in that, the rotating speed of described step 2 turntable is 40-60rpm.
6. method of granulating according to claim 1, is characterized in that, the ultimate compression strength of described ore particle is more than 300N, and dropping strength is 8.3 times/0.5m, and leaching yield is more than 85%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510920717.2A CN105506272A (en) | 2015-12-11 | 2015-12-11 | Pelletizing method suitable for heap leaching of gold ores |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105886793A (en) * | 2016-06-23 | 2016-08-24 | 昆明冶金研究院 | Deep metamorphic clay type gold ore leaching method with high recycle rate |
| CN106337120A (en) * | 2016-11-30 | 2017-01-18 | 江西理工大学 | Multiphase medium synergic leaching aid method for ionic type rare earth ore |
| CN108118147A (en) * | 2016-11-30 | 2018-06-05 | 北京有色金属研究总院 | A kind of two sections of extract technologies of oxygen-sulfur mixed copper ore |
| CN109971944A (en) * | 2019-04-19 | 2019-07-05 | 紫金矿业集团股份有限公司 | From the method for low-grade secondary copper sulfide mineral high efficiente callback copper |
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| CN1475584A (en) * | 2002-08-15 | 2004-02-18 | 北京有色金属研究总院 | Pellelizing technology suitable for biological dump leaching and extracting metal |
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| CN105039679A (en) * | 2015-05-25 | 2015-11-11 | 厦门紫金矿冶技术有限公司 | Gold ore concentrate heaping biological oxidation method |
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2015
- 2015-12-11 CN CN201510920717.2A patent/CN105506272A/en active Pending
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105886793A (en) * | 2016-06-23 | 2016-08-24 | 昆明冶金研究院 | Deep metamorphic clay type gold ore leaching method with high recycle rate |
| CN106337120A (en) * | 2016-11-30 | 2017-01-18 | 江西理工大学 | Multiphase medium synergic leaching aid method for ionic type rare earth ore |
| CN106337120B (en) * | 2016-11-30 | 2018-02-09 | 江西理工大学 | The collaboration of ion type rareearth ore multiphase medium helps leaching method |
| CN108118147A (en) * | 2016-11-30 | 2018-06-05 | 北京有色金属研究总院 | A kind of two sections of extract technologies of oxygen-sulfur mixed copper ore |
| CN108118147B (en) * | 2016-11-30 | 2019-08-16 | 有研工程技术研究院有限公司 | A kind of two sections of extract technologies of oxygen-sulfur mixed copper ore |
| CN109971944A (en) * | 2019-04-19 | 2019-07-05 | 紫金矿业集团股份有限公司 | From the method for low-grade secondary copper sulfide mineral high efficiente callback copper |
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Application publication date: 20160420 |