CN104818380B - A kind of method for reclaiming gold, silver from difficult-treating gold mine - Google Patents
A kind of method for reclaiming gold, silver from difficult-treating gold mine Download PDFInfo
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- CN104818380B CN104818380B CN201510196109.1A CN201510196109A CN104818380B CN 104818380 B CN104818380 B CN 104818380B CN 201510196109 A CN201510196109 A CN 201510196109A CN 104818380 B CN104818380 B CN 104818380B
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
A kind of method for reclaiming gold, silver from difficult-treating gold mine, belong to field of metallurgy, the present invention includes two parts, one is the inclusion enclave for pre-oxidizing destruction gold and silver by hot pressing, organic carbon in oxidized ore, and reclaim sulphur therein, two be by cyaniding or other leach without cyanogen reclaiming the Jin Heyin in preimpregnation slag.Gold and silver in refractory gold ore is reclaimed using the present invention, recovery of gold and silver more than 90%, more conventional cyaniding improve 40 percentage points, while the rate of recovery of sulphur is more than 50%, it is about 400 yuan/ton using this programme production cost, relatively with biological oxidation, two-stage roasting and conventional heat pressuring oxidation technique, it is possible to decrease investment, reduce production cost, improve the rate of recovery, realize that multielement composite is reclaimed, while reducing environmental pollution, economic and social benefit is obvious.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of method for reclaiming gold, silver from difficult-treating gold mine.
Background technology
Refractory gold ore is primarily referred to as that those are preprocessed, is unsuitable for the ore of direct cyaniding, and such ore is main
There are 3 types：
1) gangue, such as silica or carbonate parcel gold, this kind of Gold in Ores grain are too little, it is impossible to solve which with ore grinding means
From, thus goldc grains is difficult to contact cyanating solution；
2) the gold mineral that cure are mainly pyrite and mispickel and are wrapped up, and this is maximum class Refractory Au-ores；With
When, fine grinding is also insufficient to allow wrapped goldc grains contact leachate；
3) carbon-bearing gold ore, contains a certain amount of organic carbon in this kind of ore, organic carbon has certain activated carbon
Matter, in addition to parcel gold, some gold-cyanide complexs in adsorbent solution also when gold is leached.
Research shows that often above-mentioned 3 kinds difficult leaching factors are present simultaneously in various difficult mining seams.Current pin in the world
Mainly there are three kinds to the technology of golden ore concentrate hard to treat, two-stage roasting dearsenification, biological oxidation arsenic removal and pressure hot dipping go out dearsenification work
Skill.There is application the first two country, more ripe；Latter foreign applications are more, domestic existing only in zinc abstraction sector application, yellow
Golden industry there is no application precedent.
The advantage of two-stage roasting is that arsenic, sulphur can be recycled, and has the disadvantage that the rate of recovery of gold is relatively low, generally 85%～88%
Left and right, and the oxide of the fired generation of arsenic-containing ores is hypertoxic, and environmental pollution is larger.
The advantage of biological oxidation is that the rate of recovery of gold is higher, general up to 95%～97% or so, has the disadvantage that arsenic, sulphur are difficult to back
Receive and utilize, mainly stored up in the form of neutralizing slag；Meanwhile, the adaptability of bacterium is poor, requires ratio to throwing ore deposit property, operating condition
Relatively tight, with the key condition that ore deposit condition, Pre oxidation, acid-base value become restriction production, careless slightly, easily there is bacterium big
The dead major accident of amount., as biological oxidation, the rate of recovery of gold is higher for the advantage of hot-pressure leaching, also left 90%～97%
The right side, compared with biological oxidation, its applicability is wider, to ore properties, operating condition require relatively wide, its shortcoming be also arsenic and
Sulphur cannot be reclaimed, and all be present in neutralization slag；As sulphur is oxidized to sulfuric acid, also result in neutralization costly, meanwhile, HTHP
Process conditions also cause equipment manufacturing cost and maintenance cost higher.
Content of the invention
It is an object of the invention to provide a kind of method for reclaiming gold, silver from difficult-treating gold mine.
Based on above-mentioned purpose, following technical scheme is this invention takes：
A kind of method for reclaiming gold, silver from difficult-treating gold mine, first by ore fine grinding, adds water and sizes mixing, and then adds sulfuric acid
Presoaked；After preimpregnation terminates, slurries carry out hot-pressure oxidation；Oxidizing slag through separation of solid and liquid, in liquid and discharge, solid is through sizing mixing
Enter flotation and reclaim sulphur therein；After flotation tailing is through separation of solid and liquid, liquid returns flotation size mixing, and solid is through sizing mixing by cyaniding
Leach recovery therein golden and silver-colored.
Said method is comprised the following steps that：（1）Acid preimpregnation：First by ore be finely ground to particle diameter account for 50 in below 0.037mm～
98wt%, adds water and is made into solid-liquid mass ratio for 1:（1～10）Ore pulp, it is 0.3～3 to add sulphur acid for adjusting pH value, stirring 0.5～
10 hours；
（2）To step（1）After adding flotation agent in the ore pulp of gained, pump in tubular digester, be passed through oxygen, oxygen
Partial pressure is 0.1～3MPa, reacts 0.5～20h at 0.1～3MPa, 100～300 DEG C, and cooling makes sulphur crystallize precipitation, filters；
（3）To step（2）Filtering add in the filter cake of gained water to make solid-liquid mass ratio to be 1:（1～10）, it has been simultaneously introduced
No. 2 oil of infusion, react 0.2～1 hour；Flotation concentrate is sold as sulphur, and flotation tailing is filtered, and filtrate returns the replacement of this step
Water is sized mixing；
（4）Mine tailing adds water through filtration gained filter cake and sizes mixing, and makes solid-liquid mass ratio 1:（1～5）, NaCN is added, air is filled with
Cyanide Leaching is carried out, and extraction time 4～80 hours to be leached and gold and silver is reclaimed using carbon-in-pulp process or displacement method after terminating.
The step（1）Middle sulfuric acid concentration is 1～500g/L.
The step（2）In flotation agent be lignin and lignosulfonates at least one, and lignin add
Measure as 1～5000g/t ores, ligninsulfonate addition is 1～5000g/t ores, and ore slurry pipeline flow velocity is 0.1～10m/s.
The step（3）In No. 2 oily additions be 1～100g/t ores.
The step（4）In ore pulp, NaCN concentration is 0.01～10g/L.
Gold and silver in refractory gold ore is reclaimed using the present invention, recovery of gold and silver more than 90%, more conventional cyaniding are improved
40 percentage points, while the rate of recovery of sulphur is more than 50%, using about 400 yuan/ton of this programme production cost, relative with biology
Oxidation, two-stage roasting and conventional heat pressuring oxidation technique, it is possible to decrease investment, reduce production cost, improve the rate of recovery, realize multielement
Synthetical recovery, while reducing environmental pollution, economic and social benefit is obvious.
Description of the drawings
Fig. 1 is the flow chart of the present invention.
Specific embodiment
Technical scheme is described in further detail below in conjunction with specific embodiment, but the protection model of the present invention
Enclose and be not limited thereto.
Example 1
Gansu mine Gold Concentrate under Normal Pressure 2t is processed, its chemical composition see the table below：
The Gold Concentrate under Normal Pressure processes gold leaching rate 32%, cyaniding gold leaching rate 82% after roasting according to direct cyaniding；Selling price
Relatively low, economic benefit is poor.
Above-mentioned Gold Concentrate under Normal Pressure is processed using the inventive method, as shown in figure 1, concrete process step is as follows：
Step 1, acid preimpregnation：Raw material is finely ground to -0.037mm first and accounts for 85% (mass ratio), adding water is made into solid-liquid mass ratio and is
1:1.5 ore pulp, add 1g/L sulfuric acid, adjust pH value be 0.3, stir 2 hours；
Step 2, hot-pressure oxidation：Ore pulp by step 1, is diluted with water to solid-liquid mass ratio for 1:3, add lignin
5g/t ores, pump in pipeline digester through high-pressure pump, ore slurry pipeline flow velocity 0.2m/s, while being passed through oxygen, oxygen presses 0.9MPa,
Hot-pressure oxidation is carried out at 110 DEG C and leaches 5h；After leaching terminates, being cooled to 100 DEG C makes sulphur crystallize precipitation, and ore pulp is through filtering afterwards
The liquid that operation is obtained, 50% return to step 1 are sized mixing, and remaining neutralized rear qualified discharge, the solid obtained after filtration are entered
Step 3；
Step 3, flotation receive sulphur：After hot-pressure oxidation through filter gained filter cake, add water and size mixing to solid-liquid mass ratio 1:2, with
When add No. 2 oil 40g/t ores of foaming agent, flotation time 60min；Flotation concentrate sulfur-bearing 91%, dry weight 217kg, sulfur recovery rate
51.42%, flotation concentrate is sold as sulphur, and through filtering, filter cake enters step 4 to flotation tailing, and filtrate returns this step and adjusted
Slurry；
Step 4：After flotation receipts sulphur, mine tailing adds the backwater of Cyanide Leaching through the filter cake of filtration gained（See below, first plus
Water）Size mixing, be simultaneously introduced NaCN, make NaCN concentration for 1g/L, being filled with air carries out Cyanide Leaching, extraction time 36 hours；Leaching
Go out, after terminating, gold and silver is reclaimed using zinc replacement.Displacement produces gold mud 323g, and containing golden 19.2wt%, argentiferous 9.5wt%, gold is reclaimed
Rate 94.97%, silver raising recovery rate 88.58%；Mine tailing is leached through filtering, is arranged outside filter cake, filtrate (i.e. Cyanide Leaching backwater) returns this step
Suddenly sized mixing.
Example 2
Kirghiz Republic mine Gold Concentrate under Normal Pressure 50kg is processed, its chemical composition see the table below：
If directly cyaniding processes gold leaching rate 27%, cyaniding gold leaching rate 78% after roasting to the Gold Concentrate under Normal Pressure；Selling price gold meter
Valency coefficient 70%, economic benefit is poor.
Above-mentioned Gold Concentrate under Normal Pressure is processed using the inventive method, and concrete process step is as follows：
Step 1, acid preimpregnation：Raw material is finely ground to -0.037mm first and accounts for 95% (mass ratio), adding water is made into solid-liquid mass ratio and is
1:1.5 ore pulp, adds 500g/L sulfuric acid, and it is 2 to adjust pH, after stirring 5 hours, enters step 2；
Step 2, hot-pressure oxidation：Ore pulp by step 1, is diluted with water to solid-liquid mass ratio for 1:3, add sulfomethylated lignin
Hydrochlorate 6g/t ores, pump in pipeline digester through high-pressure pump, ore slurry pipeline flow velocity 2m/s, while oxygen is passed through, oxygen pressure
0.2MPa, carries out hot-pressure oxidation at 120 DEG C and leaches 0.5h.After leaching terminates, adjustment temperature makes sulphur crystallize precipitation to 100 DEG C,
The liquid that ore pulp is obtained through filtration operation afterwards, 50% return to step 1 are sized mixing, remaining neutralized rear qualified discharge.After filtration
The solid productivity 57% for obtaining, is sent to baking cyaniding smeltery and is tested（If raw material is Gold Concentrate under Normal Pressure, can be arrived with direct marketing
Smeltery）.
Step 3, flotation receive sulphur：Smeltery's baking cyaniding is it is demonstrated experimentally that adopt roasting through the Gold Concentrate under Normal Pressure that this PROCESS FOR TREATMENT is crossed
Cyanidation technology, gold recovery reach 98.2%, and silver raising recovery rate reaches 81%, and sulfur recovery rate reaches 57%, contrasts the aurin of before processing
Ore deposit, effect are obvious.
Example 3
Mine, Sichuan Gold Concentrate under Normal Pressure 100kg is processed, its chemical composition see the table below：
The Gold Concentrate under Normal Pressure processes gold leaching rate 21%, cyaniding gold leaching rate 72% after smeltery's roasting according to direct cyaniding.
Above-mentioned Gold Concentrate under Normal Pressure is processed using the inventive method, as shown in figure 1, concrete process step is as follows：
Step 1, acid preimpregnation：Raw material is finely ground to -0.037mm first and accounts for 92% (mass ratio), adding water is made into solid-liquid mass ratio and is
1:1.5 ore pulp, adds 300g/L sulfuric acid, and it is 1 to adjust pH value, after stirring 0.5 hour, enters step 2；
Step 2, hot-pressure oxidation：Ore pulp by step 1, is diluted with water to solid-liquid mass ratio for 1:3, add sulfomethylated lignin
Hydrochlorate 10g/t ores, pump in pipeline digester through high-pressure pump, ore slurry pipeline flow velocity 5m/s, while oxygen is passed through, oxygen pressure
2.5MPa, carries out heat pressuring oxidation at 140 DEG C and leaches 8h.After leaching terminates, adjustment temperature makes sulphur crystallize precipitation, mistake to 110 DEG C
Filter, the liquid for obtaining, 50% return to step 1 are sized mixing, remaining neutralized rear qualified discharge；The solid productivity obtained after filtration
48%, sulfur-bearing 21.8%, containing golden 158.42g/t, argentiferous 44.69g/t, enters step 3；
Step 3, flotation receive sulphur：After heat pressuring oxidation through filter gained filter cake, add backwater（First treated directly adds water）
Size mixing, solid-liquid mass ratio 1:2, it is simultaneously introduced No. 2 oil 40g/t ores of foaming agent, flotation time 20min；Flotation concentrate sulfur-bearing
91%, dry weight 10kg, sulphur flotation recovery rate 87%, overall recovery 38.47%, flotation concentrate are sold as sulphur, and flotation tailing is passed through
Filter, filter cake enter step 4, and filtrate returns this step and sized mixing；
Step 4：After flotation receipts sulphur, mine tailing adds the backwater of Cyanide Leaching through the filter cake of filtration gained（First treated is direct
Add water）Size mixing, be simultaneously introduced NaCN, concentration is 4g/L, being filled with air carries out Cyanide Leaching, extraction time 72 hours；Leach knot
Using recovering gold by CIP process silver after beam, filter, filtrate returns this step and sized mixing, phase analysis 3.81g/t containing gold, argentiferous 8.18g/
T, gold recovery 97.59%, silver raising recovery rate 81.69%.
Claims (4)
1. a kind of from difficult-treating gold mine reclaim gold, silver method, it is characterised in that comprise the following steps that：（1）Acid preimpregnation：First
Ore is finely ground to particle diameter and 50～98wt% is accounted in below 0.037mm, add water and be made into solid-liquid mass ratio for 1:1.5 ore pulp, adds
Sulphur acid for adjusting pH value is 0.3～3, stirs 0.5～10 hour；
（2）To step（1）After adding flotation agent in the ore pulp of gained, pump in tubular digester, be passed through oxygen, oxygen partial pressure
For 0.1～3MPa, 0.5～20h is reacted at 0.1～3MPa, 110 ~ 140 DEG C, cooling makes sulphur crystallize precipitation, filters；Described
Flotation agent is at least one in lignin and lignosulfonates, and lignin addition is 1～5000g/t ores, wooden
Sulfonate addition is 1～5000g/t ores, and ore slurry pipeline flow velocity is 0.1～10m/s；
（3）To step（2）Filtering add in the filter cake of gained water to make solid-liquid mass ratio to be 1:（1～10）, it is simultaneously introduced foaming agent 2
Number oil, reacts 0.2～1 hour；Flotation concentrate is sold as sulphur, and flotation tailing is filtered, and filtrate returns this step and replaces water to enter
Row is sized mixing；
（4）Mine tailing adds water through filtration gained filter cake and sizes mixing, and makes solid-liquid mass ratio 1:（1～5）, NaCN is added, being filled with air is carried out
Cyanide Leaching, extraction time 4～80 hours to be leached and reclaim gold and silver using carbon-in-pulp process or displacement method after terminating.
2. according to claim 1 from difficult-treating gold mine reclaim gold, silver method, it is characterised in that the step（1）
Middle sulfuric acid concentration is 1～500g/L.
3. according to claim 1 from difficult-treating gold mine reclaim gold, silver method, it is characterised in that the step（3）
In No. 2 oily additions be 1～100g/t ores.
4. according to claim 1 from difficult-treating gold mine reclaim gold, silver method, it is characterised in that the step（4）
In ore pulp, NaCN concentration is 0.01～10g/L.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105567992B (en) * | 2015-12-19 | 2018-03-30 | 中国地质科学院矿产综合利用研究所 | Method for reducing neutralization cost of refractory gold ore hot-pressing oxidation acid |
| CN105648231B (en) * | 2016-01-19 | 2017-12-08 | 中国有色桂林矿产地质研究院有限公司 | The quick hot-press oxidization pretreatment technique of microfine sulfide type of gold deposit |
| CN105950886B (en) * | 2016-04-28 | 2018-10-16 | 紫金矿业集团股份有限公司 | A kind of hot-press oxidization pretreatment method of the gold concentrate containing arsenic |
| CN105950885B (en) * | 2016-04-28 | 2018-10-16 | 紫金矿业集团股份有限公司 | A kind of slag type control process method of the gold concentrate of pyrite package |
| CN107815552B (en) * | 2017-09-30 | 2019-12-20 | 紫金矿业集团股份有限公司 | Method for recovering gold from gold-containing washing mud of gold ore cyanidation system |
| CN107805711A (en) * | 2017-10-11 | 2018-03-16 | 紫金矿业集团股份有限公司 | High-sulfur iron golden ore concentrate hard to treat containing arsenic couples extraction of gold process |
| CN107955882A (en) * | 2017-11-20 | 2018-04-24 | 长沙有色冶金设计研究院有限公司 | The high-alkali Ultrafine Grinding extraction of gold process of Refractory Au-ores |
| CN108559836A (en) * | 2018-05-15 | 2018-09-21 | 东北大学 | A kind of gold mine carries the pretreating process of gold |
| CN109848179A (en) * | 2019-01-15 | 2019-06-07 | 长春黄金研究院有限公司 | A kind of gold industry hot-pressure oxidation cyaniding tailing processing method |
| CN113088720A (en) * | 2021-04-07 | 2021-07-09 | 张伟晓 | Efficient pretreatment method for refractory metallurgical ore |
| CN113106246B (en) * | 2021-04-09 | 2021-12-17 | 东北大学 | Organic carbon modification method for carbon-containing refractory gold ore and characterization method thereof |
| CN114774687B (en) * | 2022-04-29 | 2024-01-16 | 厦门紫金矿冶技术有限公司 | Method for recovering gold and copper from oxygen-sulfur mixed copper-containing arsenic-containing refractory gold ore |
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| CN1004426B (en) * | 1987-06-22 | 1989-06-07 | 中国科学院化工冶金研究所 | Catalytic oxidation acid method for pretreating refractory gold concentrate |
| GB2349876B (en) * | 1999-05-10 | 2003-03-05 | Rio Tinto Technology Dev Ltd | Process for the Recovery of Noble Metals |
| CN1186466C (en) * | 2003-04-04 | 2005-01-26 | 山东招金集团金翅岭矿冶有限公司 | Method for extracting gold and silver from indissoluble gold and silver preparation concentrate |
| CN101403042A (en) * | 2008-11-11 | 2009-04-08 | 罗仙平 | Recovery processing method for cyanogen golden mine tailing |
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