CN105567992A - Method for reducing neutralization cost of refractory gold ore hot-pressing oxidation acid - Google Patents
Method for reducing neutralization cost of refractory gold ore hot-pressing oxidation acid Download PDFInfo
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- CN105567992A CN105567992A CN201510950983.XA CN201510950983A CN105567992A CN 105567992 A CN105567992 A CN 105567992A CN 201510950983 A CN201510950983 A CN 201510950983A CN 105567992 A CN105567992 A CN 105567992A
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention relates to a method for reducing acid neutralization cost in a hot-pressing oxidation process of refractory gold ores, which is characterized in that gold-loaded sulfide minerals and carbonate minerals are simultaneously enriched in a flotation process, the acid-base mineral balance of a flotation product is controlled, acidification adjustment before hot-pressing oxidation is combined with an excess acid neutralization process flow, the gold recovery rate is improved, the process flow is reduced, the capital investment and the operation cost are reduced, the harmless treatment of harmful elements such As Fe, As and the like is realized, and the method is a clean and efficient green smelting process; the process aims at the characteristics that gold ore resources in China are mainly low-grade and medium-small ore deposits, are relatively centralized in distribution and have a large proportion of refractory gold ores, and is a high-efficiency clean production process which is suitable for carrying out hot-pressing oxidation pretreatment by adopting an ore blending mechanism for concentrating a plurality of ore deposits to float gold ores; the process can obviously improve the current situation of low overall recovery rate of the refractory gold ores, reduce the environmental protection cost in the existing roasting oxidation and biological oxidation and improve the comprehensive utilization rate of resources.
Description
Technical field
The invention belongs to clean wet-method metallurgical technology field, be specifically related to the sour neutralization method of acid hot-pressure oxidation technique, particularly a kind of method reduced with cost in the acid of difficult-treating gold mine hot-pressure oxidation.
Background technology
Along with constantly carrying out of exploitation of gold deposit, tractable gold ore resource is day by day exhausted, and difficult-treating gold mine becomes the Main Resources of gold industry from now on.Announce according to China Association of National Gold's statistics, Chinese difficult-treating gold mine resource (being mainly Fine Disseminated Type of Gold Deposits) total metal content is 1500t--2000t, accounts for more than 30% of geologic reserve; And constantly verifying along with deep resource, its proportion is expansion trend.At present, roasting oxidation, bio-oxidation and hot-pressure oxidation three kinds of pretreatment technology are mainly contained for difficult-treating gold mine; First two process application is comparatively ripe, and rear a kind of technique is only in zinc and nickel fibers sector application, and gold industry there is no application example.
Hot-pressure oxidation technique mainly utilizes air or oxygen enrichment to carry out high-temperature oxidation process in autoclave, and by heating, the means of oxygenation destroy the crystal of sulfide mineral and part gangue mineral, make to be come out, so that follow-up Cyanide Leaching gold recovering by the gold of its parcel.Because this technique both can process raw ore, also concentrate can be processed; And there is the distinguishing features such as gold recovery is high, strong adaptability, harmful " three wastes " discharge of nothing, be considered to the most effective difficult-treating gold mine pretreatment technology in western countries, part scientific research institutions of China and enterprise also follow up and research and develop this technology.
Because China's gold ore resource has based on features such as middle-low grade and middle-size and small-size mineral deposit, distribution Relatively centralized and difficult-treating gold mine accounting are large; Directly process the hot-press oxidization pretreatment technique of difficult-treating gold mine raw ore in China's development, then there is operation cost height and invest and reclaim difficult problem.But, in view of China's gold ore resource Relatively centralized, and the feature that ore properties in concentration zones is close, be suitable for adopting first flotation on the spot to obtain gold ore product, then concentrate to adopt and join the thinking of development that ore deposit mechanism carries out hot-press oxidization pretreatment.From the production instance of external golden ore concentrate hard to treat hot-pressure oxidation, acid excessive in production technique all adopts calcium carbonate/limestone vegetation process, and consumption is large, cost is high; The low cost neutralization method of acid more than needed can be reduced if find, then can further improve economic benefit, be also convenient to this process for cleanly preparing of hot-pressure oxidation in China's development and application.
Such as, Chinese patent literature, publication number is CN103194613A, publication date is on 07 10th, 2013, denomination of invention is the patent of invention of " from containing arsenic, containing the method extracting gold charcoal high basic gangue ", mention the high basic gangue mine tailing after by flotation in order in and bio-oxidation or the peracid of hot-pressure oxidation output, high Fe, be oxidized waste liquid containing As, in and slag muck Tailings Dam, neutralizer returns the method recycled.This neutralization method is applicable to the hot-pressure oxidation production technique of single large-scale, super-large size gold deposit, there is the problem that flotation tailings dosis neutralisata is big or middle and process cost is high; If according to China's Features of The Gold Resources, adopt and concentrate the ore deposit mechanism of joining of multiple mineral deposit flotation gold mine to carry out hot-press oxidization pretreatment, then same exist the superfluous problem of a large amount of acid.
The feature that ore properties for China's gold ore resource Relatively centralized and in gold ore resource concentration zones is close, suitable employing concentrates the ore deposit mechanism of joining of multiple mineral deposit flotation gold mine to carry out hot-press oxidization pretreatment, is necessary to propose the superfluous low cost neutralization method of new solution acid.
Summary of the invention
The present invention is directed to China's gold ore resource Relatively centralized and the close feature of ore properties in gold ore resource concentration zones, what be suitable for the concentrated multiple mineral deposit flotation gold mine of employing joins the process for cleanly preparing that ore deposit mechanism carries out hot-press oxidization pretreatment, provide a kind of acid reducing difficult-treating gold mine hot-pressure oxidation technique and be neutralized into present method, the method carries golden sulfide mineral and carbonate minerals by Sync enrichment in floatation process, control floating product soda acid mineral equilibrium, merge in the acidifying adjustment before hot-pressure oxidation and surplus acid with technical process, reach raising gold recovery, reduction technical process, with the effect of cost in reduction.
Technical scheme of the present invention is as follows:
The acid reducing difficult-treating gold mine hot-pressure oxidation technique is neutralized into a present method, comprises the steps:
The synchronous floating and enriching of A, be broken containing golden raw ore, carry out after ore grinding to appropriate particle size carrying in flotation cell golden sulfide mineral (pyrite, arsenopyrite and limonite etc.) and carbonate minerals (calcite, rhombspar etc.), acquisition gold floatation concentrate product;
B, gold floatation concentrate is transported to hot-pressure oxidation factory carries out ore grinding again, gold floatation concentrate again after ore grinding mixes size mixing with the liquid that returns after hot-pressure oxidation in acidizing neutralization regulating tank, and the ore pulp obtained after sizing mixing enters the reaction of hot-pressure oxidation reactor through steam heater and high-pressure diaphragm pump;
C, reacted after ore pulp carry out recovered steam heat through flashing tower, steam heat returns step B for steam heater, and cooled ore pulp enters splitter box;
Fraction pulp in D, splitter box returns step B to carry out acidizing neutralization and sizes mixing, and remainder ore pulp enters thickener, and the overflow of thickener returns step B, and underflow enters follow-up charcoal slurry and puies forward metal working sequence.
In described steps A, be broken containing golden raw ore, the fineness of ore grinding determined by beneficiation test according to ore properties, generally at least 80% is less than 74 microns.
In described steps A, the gold floatation concentrate product of acquisition, mainly comprises and carries golden sulfide mineral and carbonate minerals, the sulphur (S of described gold floatation concentrate product medium sulphide content
2-) content range is 4-20%, the sulphur (S of sulfide
2-) and total carbon acid group (CO
3 2-) mass ratio control between 0.5-1.0.
In described step B, gold floatation concentrate product is carried out ore grinding again and reach at least 80% particle effective diameter and be less than 25 microns.
In described step B, the pulp density in acidizing neutralization regulating tank is 40-60%, and after neutralization, acidity control is hydrogen ion [H
+] concentration is 0.001-0.1mol/L.
In described step D, the ore pulp back amount in splitter box, according to the sulphur content calculation control in gold floatation concentrate product, enters the ore pulp sulfur (S in reactor
2-) content is 4-8%.
Feature of the present invention and effect comprise:
(1) in floating and enriching process, Sync enrichment carries golden sulfide mineral and carbonate minerals, the gold wrapped up in the recyclable carbonate of this synchronous method for floating, significantly improves the rate of recovery of gold.
(2) utilize ubiquitous carbonate minerals in gold containing ore to achieve the low cost neutralization of acid more than needed in hot-pressure oxidation process, directly can reduce hot-pressure oxidation production and operation cost more than 20%.
(3) by the acidifying adjustment before hot-pressure oxidation and surplus acid and technical process merge, reduce in the acid in ore pulp overflow water after hot-pressure oxidation and operation, shorten technical process, reduce further initial cost and operation cost.
(4) Fe, As harmful element after hot-pressure oxidation in ore pulp returns hot-pressure oxidation reactor pyroprocessing after acidizing neutralization is sized mixing, and generates stable scorodite and calcium sulfate, achieves harmful element harmless treatment, is the green dressing and smelting process of clean and effective.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Embodiment
As shown in Figure 1, in reduction difficult-treating gold mine hot-pressure oxidation technique involved in the present invention in acid and the technological principle flow process of cost.Below in conjunction with specific embodiment, technical scheme of the present invention is described in further detail, but protection scope of the present invention is not limited thereto.
(1) testing handling object is Mine, Sichuan gold mine.
This ore deposit is Quartz Vein Type sulfur compound gold mine, and metalliferous mineral is based on pyrite, mispickel, rhombohedral iron ore (containing magnetite), and gangue mineral is based on quartz, pyroxene, rhombspar and chlorite etc.There is no independent gold mineral in ore, there is no ADSORPTION OF GOLD; Gold is mainly composed with the form of submicro gold-super submicro gold and is stored in mispickel and pyrite.The multinomial analysis of chemistry of this ore refers to table 1, and gold phase analysis is the results detailed in Table 2.
The chemical multinomial analytical results of table 1
Table 2 gold phase analysis result
(2) exploratory experiment shows that this ore deposit is suitable for adopting floatation process enriching and recovering gold.As shown in Figure 1, ore reduction ore grinding is less than 74 microns to sample ore granularity 90%, is obtained the mixing gold ore of carrying golden sulfide mineral and carbonate minerals by synchronous flotation.Compare the technique that golden sulfide mineral is carried in traditional single enrichment, the rate of recovery of gold can be risen to 94% from 86% by which, and gold ore productive rate is increased to 6.5%(from 4.8% and refers to table 3).Synchronous flotation flotation reagent used is: copper sulfate 200g/t; Sodium sulphite 1000g/t; Sodium carbonate 500g/t; Water glass 1500g/t; Butyl xanthate, Y-89 xanthate and soya fatty acid soap composite (2/1/1) 500g/t; No. two oily 20g/t.
Table 3 two kinds of flotation experimental results contrasts
(3) gold floatation concentrate carries out in hot-pressure oxidation workshop regrinding to sample ore granularity 80% and is less than 25 microns, and the gold ore after regrinding mixes with the liquid that returns after hot-pressure oxidation in acidizing neutralization regulating tank.Have adjusted the acidity (general pan feeding slurry pH 1-3) of hot-pressure oxidation pan feeding on the one hand, neutralize acid excessive in rework solution on the other hand.
(4) pump after steam heating of the ore pulp after neutralization, as hot-pressure oxidation reactor, reacts overflow discharge to the flashing tower that to reduce pressure after 2 hours and carries out lowering the temperature and steam heat reclaims under the condition of temperature 195 DEG C, oxygen partial pressure 0.7Mpa, pulp density 50%.
(5) in flashing tower, ore pulp is shunted after further decrease temperature and pressure in splitter box, and the ore pulp of 70% returns acidizing neutralization regulating tank; The ore pulp of 30% enters solid-liquid separation flow process, and the liquid after separation returns acidizing neutralization regulating tank, and solid enters charcoal slurry and puies forward golden flow process.After adopting synchronous floatation process, gold floatation concentrate per ton can save 168kg lime or 300kg calcium carbonate after hot-pressure oxidation, significantly reduce reagent expense and in and cost.
(6) ore pulp through neutralization size mixing, Cyanide Leaching, charcoal slurry carry gold after, enter Tailings Dam after slurry concentrating, liquid portion returns Cyanide Leaching, and solid slag is disposed to Tailings Dam after Losantin process; Gold loaded carbon carries out washing, desorb, regeneration, gac returns charcoal slurry and carries gold, and stripping liquid obtains ingot after electrodeposition melting.The comprehensive recovery >90% of whole charcoal slurry gold extraction technology gold.
Claims (8)
1. the acid reducing difficult-treating gold mine hot-pressure oxidation technique is neutralized into a present method, it is characterized in that comprising the steps:
The synchronous floating and enriching of A, be broken containing golden raw ore, carry out after ore grinding carrying in flotation cell golden sulfide mineral and carbonate minerals, obtains gold floatation concentrate product;
B, gold floatation concentrate is carried out ore grinding again, then the gold floatation concentrate after ore grinding mixes and sizes mixing in acidizing neutralization regulating tank with the liquid that returns after hot-pressure oxidation, the ore pulp obtained after sizing mixing enters the reaction of hot-pressure oxidation reactor through steam heater and high-pressure diaphragm pump;
C, reacted after ore pulp carry out recovered steam heat through flashing tower, steam heat returns step B for steam heater, and cooled ore pulp enters splitter box;
Fraction pulp in D, splitter box returns step B to carry out acidizing neutralization and sizes mixing, and remainder ore pulp enters thickener, and the overflow of thickener returns step B, and underflow enters follow-up charcoal slurry and puies forward metal working sequence.
2. the acid of reduction difficult-treating gold mine hot-pressure oxidation technique according to claim 1 is neutralized into present method, it is characterized in that: in described steps A, is broken containing golden raw ore, after ore grinding, the fineness containing golden raw ore of at least 80% is less than 74 microns.
3. the acid of reduction difficult-treating gold mine hot-pressure oxidation technique according to claim 1 is neutralized into present method, and it is characterized in that: in steps A, within described year, golden sulfide mineral comprises pyrite, arsenopyrite and limonite.
4. the acid of reduction difficult-treating gold mine hot-pressure oxidation technique according to claim 1 is neutralized into present method, and it is characterized in that: in steps A, described carbonate minerals comprises calcite, rhombspar.
5. the acid of reduction difficult-treating gold mine hot-pressure oxidation technique according to claim 1 is neutralized into present method, it is characterized in that: in described steps A, the gold floatation concentrate product obtained, mainly comprises and carries golden sulfide mineral and carbonate minerals, the sulphur S of described gold floatation concentrate product medium sulphide content
2-content range is 4-20%, the sulphur S of sulfide
2-with total carbon acid group CO
3 2-mass ratio control between 0.5-1.0.
6. the acid of reduction difficult-treating gold mine hot-pressure oxidation technique according to claim 1 is neutralized into present method, it is characterized in that: in described step B, after gold floatation concentrate product is carried out ore grinding again, the effective diameter of the gold floatation concentrate product particle of at least 80% is less than 25 microns.
7. the acid of reduction difficult-treating gold mine hot-pressure oxidation technique according to claim 1 is neutralized into present method, and it is characterized in that: in described step B, the pulp density in acidizing neutralization regulating tank is 40-60%, and after neutralization, acidity control is hydrogen ion [H
+] concentration is 0.001-0.1mol/L.
8. the acid of reduction difficult-treating gold mine hot-pressure oxidation technique according to claim 1 is neutralized into present method, it is characterized in that: in described step D, ore pulp back amount in splitter box, according to the sulphur content calculation control in gold floatation concentrate product, enters the sulphur S in the ore pulp sulfide in reactor
2-content is 4-8%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086455A (en) * | 2016-08-18 | 2016-11-09 | 紫金矿业集团股份有限公司 | A kind of Quick Oxidation method of carbonaceous Very Small Au-ore |
| CN112725633A (en) * | 2021-02-07 | 2021-04-30 | 厦门海峡黄金珠宝产业园有限公司 | Negative pressure type gold chlorination and separation process |
| CN113846213A (en) * | 2021-09-24 | 2021-12-28 | 中国恩菲工程技术有限公司 | Refractory gold ore processing system |
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| CN85107794A (en) * | 1984-09-27 | 1987-04-29 | 谢尔里特·戈登矿有限公司 | From containing the technology that reclaims gold in the middle of the golden iron content sulfide mineral |
| CN2555269Y (en) * | 2002-07-31 | 2003-06-11 | 彭英利 | Deep heat pressure oxidation treatment equipment for hard immersion gold ore |
| CN103194613A (en) * | 2013-04-15 | 2013-07-10 | 紫金矿业集团股份有限公司 | Method for extracting gold from high basic gangue containing arsenic and carbon |
| CN104818380A (en) * | 2015-04-23 | 2015-08-05 | 张伟晓 | Method for recovering gold and silver from refractory gold ores |
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2015
- 2015-12-19 CN CN201510950983.XA patent/CN105567992B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN85107794A (en) * | 1984-09-27 | 1987-04-29 | 谢尔里特·戈登矿有限公司 | From containing the technology that reclaims gold in the middle of the golden iron content sulfide mineral |
| CN2555269Y (en) * | 2002-07-31 | 2003-06-11 | 彭英利 | Deep heat pressure oxidation treatment equipment for hard immersion gold ore |
| CN103194613A (en) * | 2013-04-15 | 2013-07-10 | 紫金矿业集团股份有限公司 | Method for extracting gold from high basic gangue containing arsenic and carbon |
| CN104818380A (en) * | 2015-04-23 | 2015-08-05 | 张伟晓 | Method for recovering gold and silver from refractory gold ores |
Non-Patent Citations (1)
| Title |
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| 黄礼煌: "《金银提取技术 第3版》", 31 May 2012 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086455A (en) * | 2016-08-18 | 2016-11-09 | 紫金矿业集团股份有限公司 | A kind of Quick Oxidation method of carbonaceous Very Small Au-ore |
| CN112725633A (en) * | 2021-02-07 | 2021-04-30 | 厦门海峡黄金珠宝产业园有限公司 | Negative pressure type gold chlorination and separation process |
| CN113846213A (en) * | 2021-09-24 | 2021-12-28 | 中国恩菲工程技术有限公司 | Refractory gold ore processing system |
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