CN105567992B - 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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- CN105567992B CN105567992B CN201510950983.XA CN201510950983A CN105567992B CN 105567992 B CN105567992 B CN 105567992B CN 201510950983 A CN201510950983 A CN 201510950983A CN 105567992 B CN105567992 B CN 105567992B
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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, and in particular to the sour neutralization method of acid hot-pressure oxidation technique,
Particularly a kind of method for reducing difficult-treating gold mine hot-pressure oxidation acid and neutralizing cost.
Background technology
With the continuous progress of exploitation of gold deposit, tractable gold ore resource increasingly depleted, difficult-treating gold mine turns into yellow from now on
The main resource of metal working industry.Count and announce according to China Association of National Gold, Chinese difficult-treating gold mine resource（Predominantly micro-grain impregnation
Gold mine）Total metal content is 1500t--2000t, accounts for more than the 30% of oil in place；And constantly verifying with deep resource, its institute
Accounting example is in expansion trend.At present, mainly there are roasting oxidation, biological oxidation and the pre- place of three kinds of hot-pressure oxidation for difficult-treating gold mine
Science and engineering skill；First two technique application is more ripe, and for latter technique only in zinc and nickel fibers sector application, gold industry there is no should
Use example.
Hot-pressure oxidation technique mainly using air or it is oxygen-enriched high-temperature oxidation process is carried out in autoclave, by heat,
The means of oxygenation destroy the crystal of sulfide mineral and part gangue mineral, the gold by its parcel are exposed, so as to follow-up cyanogen
Change and leach recovery gold.Because the technique can both handle raw ore, concentrate can be also handled；And with gold recovery height, strong adaptability, nothing
The distinguishing features such as harmful " three wastes " discharge, it is considered as maximally effective difficult-treating gold mine pretreating process in western countries, China
Part scientific research institutions and enterprise, which also follow up, researches and develops this technology.
Because China's gold ore resource has based on middle-low grade and middle-size and small-size mineral deposit, distribution Relatively centralized and difficult
The features such as gold mine accounting is big；In China, development directly handles the hot-press oxidization pretreatment technique of difficult-treating gold mine raw ore, then exists
Operation cost is high and the problem of difficult is reclaimed in investment.But in view of China's gold ore resource Relatively centralized, and the ore in concentration zones
The characteristics of matter is close, suitably using first flotation obtains aurin mineral products on the spot, then concentrates and carry out hot-pressure oxidation using with ore deposit mechanism
The thinking of development of pretreatment.It was found from the production instance of external golden ore concentrate hard to treat hot-pressure oxidation, a large amount of mistakes in production technology
Surplus acid uses calcium carbonate/lime neutralisation treatment, and dosage is big, cost is high；If the low cost neutralization of acid more than needed can be reduced by finding
Method, then economic benefit is can further improve, also allow for hot-pressure oxidation this process for cleanly preparing in China's development and application.
For example, Chinese patent literature, Publication No. CN103194613A, publication date are on 07 10th, 2013, invention name
The referred to as patent of invention of " method that gold is extracted from containing arsenic, high basic gangue containing charcoal ", is mentioned the high basic gangue after flotation
Mine tailing is to neutralize the peracid of biological oxidation or hot-pressure oxidation output, high Fe, waste liquid is aoxidized containing As, neutralization slag muck Tailings Dam, in
The method recycled is returned with liquid.The neutralization method is adapted to single large-scale, super-large size gold deposit hot-pressure oxidation production technology,
The problem of flotation tailing dosis neutralisata is big, neutralization step cost is high be present；It is if multiple using concentrating according to China's Features of The Gold Resources
Flotation gold mine in mineral deposit carries out hot-press oxidization pretreatment with ore deposit mechanism, then equally exists the problem of a large amount of acid are superfluous.
For the ore properties in China's gold ore resource Relatively centralized and gold ore resource concentration zones it is close the characteristics of, suitably adopt
Hot-press oxidization pretreatment is carried out with ore deposit mechanism, it is necessary to propose new solution acid surplus with the multiple mineral deposit flotation gold mines of concentration
Inexpensive neutralization method.
The content of the invention
The characteristics of ore properties that the present invention is directed in China's gold ore resource Relatively centralized and gold ore resource concentration zones are close,
Suitably using the process for cleanly preparing that hot-press oxidization pretreatment is carried out with ore deposit mechanism for concentrating multiple mineral deposit flotation gold mines, there is provided
A kind of acid for reducing difficult-treating gold mine hot-pressure oxidation technique neutralizes cost method, and this method is by simultaneously rich in floatation process
Collection carries golden sulfide mineral and carbonate mineral, controls floating product soda acid mineral equilibrium, by the acidifying regulation before hot-pressure oxidation with
Superfluous acid neutralizes technological process and merged, and reaches and improves gold recovery, reduction technological process, reduces the effect for neutralizing cost.
Technical scheme is as follows：
A kind of acid for reducing difficult-treating gold mine hot-pressure oxidation technique neutralizes cost method, comprises the following steps：
A, it is broken containing golden tcrude ore, carries out in flotation cell carrying golden sulfide mineral after ore grinding to appropriate particle size（Pyrite,
Mispickel and limonite etc.）And carbonate mineral（Calcite, dolomite etc.）Synchronous floating and enriching, obtain gold floatation concentrate
Product；
B, gold floatation concentrate is transported into the gold floatation concentrate after carrying out ore grinding, then ore grinding again to hot-pressure oxidation factory in acidifying
Mix and size mixing with the liquid that returns after hot-pressure oxidation with regulating tank, the ore pulp obtained after sizing mixing is through steam heater and autoclave diaphragm
Pump reacts into hot-pressure oxidation reactor；
C, the ore pulp after the completion of reacting carries out recovered steam heat through flash column, and steam heat return to step B adds for steam
Thermal uses, and the ore pulp after cooling enters splitter box；
D, the fraction pulp return to step B in splitter box carry out be acidified neutralization size mixing, remainder ore pulp enters concentrator,
The overflow return to step B of concentrator, underflow enter follow-up charcoal slurry and put forward metal working sequence.
In the step A, be broken containing golden tcrude ore, the fineness of ore grinding is determined according to ore properties by beneficiation test, one
As at least 80% be less than 74 microns.
In the step A, the gold floatation concentrate product of acquisition is main to include the golden sulfide mineral of load and carbonate mineral, institute
State the sulphur of sulfide in gold floatation concentrate product（S2-）Content range is 4-20%, the sulphur of sulfide（S2-）With total carbon acid group
（CO3 2-）Mass ratio control between 0.5-1.0.
In the step B, gold floatation concentrate product is subjected to again ore grinding and reaches at least 80% particle effective diameter less than 25 micro-
Rice.
In the step B, the pulp density that acidifying is neutralized in regulating tank is 40-60%, and controlling pH is hydrogen ion after neutralization
[H+] concentration is 0.001-0.1mol/L.
In the step D, sulfur content of the ore pulp back amount in gold floatation concentrate product in splitter box calculates control,
Into the ore pulp sulfur in reactor（S2-）Content is 4-8%.
The features of the present invention and effect include：
（1）During floating and enriching, Sync enrichment carries golden sulfide mineral and carbonate mineral, and the synchronous method for floating can
The gold wrapped up in recovery carbonate, significantly improve the rate of recovery of gold.
（2）Using the carbonate mineral of generally existing in gold containing ore realize acid of having more than needed during hot-pressure oxidation it is low into
This neutralization, it can directly reduce hot-pressure oxidation production and operation cost more than 20%.
（3）The acidifying regulation before hot-pressure oxidation is neutralized into technological process with superfluous acid to merge, reduced to after hot-pressure oxidation
Sour neutralization step in ore pulp overflow water, shortens technological process, reduce further capital expenditure and operation cost.
（4）The acidified neutralization of Fe, As harmful element after hot-pressure oxidation in ore pulp returns to hot-pressure oxidation reactor after sizing mixing
High-temperature process, stable scorodite and calcium sulfate are generated, realizes harmful element harmless treatment, be the green choosing of clean and effective
Smelting process.
Brief description of the drawings
Fig. 1 is the process flow diagram of the present invention.
Embodiment
As shown in figure 1, involved in the present invention reduces the technique that acid neutralizes cost in difficult-treating gold mine hot-pressure oxidation technique
Principle process.Technical scheme is described in further detail below in conjunction with specific embodiment, but the protection of the present invention
Scope is not limited thereto.
（1）Test process object is Mine, Sichuan gold mine.
The ore deposit is Quartz Vein Type sulfur compound gold mine, and metalliferous mineral is with pyrite, mispickel, bloodstone（Containing magnetic iron ore）For
Main, gangue mineral is based on quartz, pyroxene, dolomite and chlorite etc..There is no independent gold mineral in ore, without ADSORPTION OF GOLD；
Gold mainly in the form of submicro gold-super submicro gold preservation in mispickel and pyrite.The chemical multinomial analysis of the ore is detailed
1 is shown in Table, gold phase analysis is the results detailed in Table 2.
The multinomial analysis result of the chemistry of table 1
The gold phase analysis result of table 2
（2）Exploratory experiment shows the ore deposit suitably using floatation process enriching and recovering gold.As shown in figure 1, ore reduction is ground
Ore deposit to sample ore granularity 90% is less than 74 microns, and the mixing aurin for carrying golden sulfide mineral and carbonate mineral is obtained by synchronous flotation
Ore deposit.Compared to the technique that traditional single enrichment carries golden sulfide mineral, which can be by the rate of recovery of gold from 86% lifting to 94%, Gold Concentrate under Normal Pressure
Yield increases to 6.5% from 4.8%（Refer to table 3）.Floating agent used in synchronous flotation is：The g/t of copper sulphate 200；Vulcanized sodium 1000
g/t；The g/t of sodium carbonate 500；The g/t of waterglass 1500；Butyl xanthate, Y-89 xanthate and soya bean fatty acid soap compounding（2/1/1)
500 g/t；No. two g/t of oil 20.
3 two kinds of flotation experimental results contrasts of table
（3）Gold floatation concentrate, which is regrinded in hot-pressure oxidation workshop to sample ore granularity 80%, is less than 25 microns, the gold after regrinding
Concentrate mixes in acidifying and in regulating tank with the liquid that returns after hot-pressure oxidation.On the one hand it have adjusted the acidity of hot-pressure oxidation pan feeding
（General pan feeding slurry pH 1-3）, on the other hand neutralized acid excessive in rework solution.
（4）Ore pulp after the neutralization pump such as hot-pressure oxidation reactor after steam heats, in 195 DEG C of temperature, partial pressure of oxygen
Decompression overflow discharge is cooled to flash column after being reacted 2 hours under conditions of 0.7Mpa, pulp density 50% and steam heat returns
Receive.
（5）Ore pulp shunts after further decrease temperature and pressure in splitter box in flash column, and 70% ore pulp returns to acidifying and neutralized
Regulating tank；30% ore pulp enters separation of solid and liquid flow, and the liquid after separation returns to acidifying and neutralizes regulating tank, and solid is starched into charcoal
Put forward golden flow.After synchronous floatation process, gold floatation concentrate per ton can save 168kg lime or 300kg after hot-pressure oxidation
Calcium carbonate, significantly reduce reagent expense and neutralize cost.
（6）After ore pulp is neutralized to size mixing, Cyanide Leaching, charcoal slurry carry gold, Tailings Dam is entered after slurry concentrating, liquid portion returns
Cyanide Leaching is returned, solid slag is emitted into Tailings Dam after calcium hypochlorite is handled；Gold loaded carbon is washed, desorbed, regenerated, activity
Charcoal returns to charcoal slurry and carries gold, and stripping liquid obtains ingot after electrodeposition melting.The comprehensive recovery of whole charcoal slurry extraction of gold process gold>90%.
Claims (2)
1. a kind of acid for reducing difficult-treating gold mine hot-pressure oxidation technique neutralizes cost method, it is characterised in that comprises the following steps：
A, it is broken containing golden tcrude ore, in flotation cell carry the synchronous flotation of golden sulfide mineral and carbonate mineral after ore grinding
Enrichment, obtain gold floatation concentrate product；It is described to be broken, after ore grinding containing golden tcrude ore, at least 80% fineness containing golden tcrude ore
Less than 74 microns；The gold floatation concentrate product obtained is mainly comprising the golden sulfide mineral of load and carbonate mineral, the flotation gold
The sulphur S of sulfide in concentrate product2-Content range is 4-20%, the sulphur S of sulfide2-With total carbon acid group CO3 2-Mass ratio control
System is between 0.5-1.0；
Floating agent used is：The g/t of copper sulphate 200；The g/t of vulcanized sodium 1000；The g/t of sodium carbonate 500；The g/t of waterglass 1500；
Butyl xanthate, Y-89 xanthate and soya bean fatty acid soap compounding press 2：1：1,500 g/t；No. two g/t of oil 20；
The golden sulfide mineral of load includes pyrite, mispickel and limonite；The carbonate mineral includes calcite, white clouds
Stone；
B, gold floatation concentrate is subjected to ore grinding again so that the effective diameter of at least 80% gold floatation concentrate product particle is less than 25
Micron, then gold floatation concentrate after ore grinding are mixed and sized mixing with the liquid that returns after hot-pressure oxidation in acidifying and in regulating tank, after sizing mixing
Obtained ore pulp reacts through steam heater and high-pressure diaphragm pump into hot-pressure oxidation reactor；The acidifying neutralizes regulating tank
In pulp density be 40-60%, controlling pH is hydrogen ion [H after neutralization+] concentration is 0.001-0.1mol/L；
C, the ore pulp after the completion of reacting carries out recovered steam heat through flash column, and steam heat return to step B is for steam heating dress
Use is put, the ore pulp after cooling enters splitter box；
D, the fraction pulp return to step B in splitter box carry out be acidified neutralization size mixing, remainder ore pulp enters concentrator, dense
The overflow return to step B of machine, underflow enter follow-up charcoal slurry and put forward metal working sequence.
2. the acid according to claim 1 for reducing difficult-treating gold mine hot-pressure oxidation technique neutralizes cost method, its feature exists
In：In the step D, sulfur content of the ore pulp back amount in gold floatation concentrate product in splitter box calculates control, enters
The sulphur S in ore pulp sulfide in reactor2-Content is 4-8%.
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| CN201510950983.XA CN105567992B (en) | 2015-12-19 | 2015-12-19 | Method for reducing neutralization cost of refractory gold ore hot-pressing oxidation acid |
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| 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 |
| CN112725633B (en) * | 2021-02-07 | 2022-04-26 | 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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| CA1234290A (en) * | 1984-09-27 | 1988-03-22 | Donald R. Weir | Recovery of gold from refractory auriferous iron- containing sulphidic material |
| CN2555269Y (en) * | 2002-07-31 | 2003-06-11 | 彭英利 | Deep heat pressure oxidation treatment equipment for hard immersion gold ore |
| CN103194613B (en) * | 2013-04-15 | 2015-03-11 | 紫金矿业集团股份有限公司 | Method for extracting gold from high basic gangue containing arsenic and carbon |
| CN104818380B (en) * | 2015-04-23 | 2017-03-15 | 张伟晓 | A kind of method for reclaiming gold, silver from difficult-treating gold mine |
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