CN109112306A - A method of utilizing ozone oxidation and microbiological oxidation Combined Treatment golden ore concentrate hard to treat - Google Patents
A method of utilizing ozone oxidation and microbiological oxidation Combined Treatment golden ore concentrate hard to treat Download PDFInfo
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- CN109112306A CN109112306A CN201810872469.2A CN201810872469A CN109112306A CN 109112306 A CN109112306 A CN 109112306A CN 201810872469 A CN201810872469 A CN 201810872469A CN 109112306 A CN109112306 A CN 109112306A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/18—Extraction of metal compounds from ores or concentrates by wet processes with the aid of microorganisms or enzymes, e.g. bacteria or algae
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Abstract
The invention discloses a kind of method using ozone oxidation and microbiological oxidation Combined Treatment golden ore concentrate hard to treat, include the following steps: that ore pulp is made after golden ore concentrate hard to treat is broken into miberal powder by (1)；(2) it is passed through ozone and carries out ozone oxidation reaction, then microbe inoculation carries out microbiological oxidation reaction in ore pulp；Or microbe inoculation carries out microbiological oxidation reaction in manufactured ore pulp, then passes to ozone and carries out ozone oxidation reaction；(3) obtained ore pulp is separated by solid-liquid separation after reacting, and the slag obtained after filtering, which enters, to be mentioned the golden stage and carry out mentioning gold.Method of the invention, it is combined using ozone Oxidation Treatment with microbiological oxidation processing, aoxidize pyrite, mispickel in Gold Concentrate under Normal Pressure, it is passivated simple substance carbon, golden agent finally, which is proposed, using thiocarbamide etc. mentions gold, the leaching rate of gold can not only be greatly improved and shorten leaching cycle, and reagent and equipment cost can also be substantially reduced.
Description
Technical field
The present invention relates to a kind of pretreating process of golden ore concentrate hard to treat more particularly to a kind of utilization ozone oxidation and micro- lifes
The method of object oxidization combination processing golden ore concentrate hard to treat.
Background technique
With continually developing for mineral resources, easy to handle gold ore resource is reduced increasingly, and difficult-treating gold mine is shared in production
Ratio is continuously increased.According to statistics, reserves golden in difficult-treating gold mine account for the 60% of gold gross reserves in the world, currently, the world is total
One third of yield or so comes from difficult-treating gold mine, and China has been verified in gold reserve, and 30% belongs to difficult-treating gold mine, to this
Class gold ore resource develop and use and is had a very important significance.
Difficult-treating gold mine with high arsenic, high-sulfur and carbon containing, or gold in the form of microfine, micro- or submicroscopic due to being wrapped in
The features such as in gangue mineral and harmful cyaniding mineral, causes difficult-treating gold mine dressing and smelting process complexity, long flow path, invests and be produced into
This height.Currently, the processing method for being usually used in difficult-treating gold mine has roasting oxidation pretreatment, hot-press oxidization pretreatment, biological oxidation
The methods of pretreatment.Wherein, roasting oxidation pretreatment is still the most common preprocess method of current difficult-treating gold mine, which can
The sulfide of package gold is set to be decomposed into porous oxide and expose, meanwhile, titanium dioxide can be converted by organic carbon, inorganic carbon
Carbon, to improve gold leaching rate.The advantage of this process is that adaptability is stronger, the disadvantage is that generating SO when roasting2、As2O3It can be serious dirty
Environment is contaminated, environmental protection pressure is larger, moreover, the technique is more sensitive to operating parameter and feed composition transfer, easily causes burning or owes
It burns, leads to the leaching rate decline of gold.The principle of hot-press oxidization pretreatment technique is anti-using the chemistry of pressurization accelerated oxidation process
Rate is answered, its advantage is that whole process Whote-wet method, does not lead to the problem of smoke pollution, be dissolved in solution after pyrite and mispickel oxidation
In, the golden rate of recovery is higher；The disadvantage is that equipment design is more demanding with material, production scale is required.Microbiological oxidation is pre-
Processing is using the intracorporal iron of microorganism, sulphur oxidase system oxygenolysis pyrite and mispickel, its advantage is that simple process, setting
Standby cost investment is low, environmentally protective, but the disadvantage is that reaction time is longer, microorganism is limited to the tolerance level of arsenic.
In conclusion at present there are some disadvantages and limit its application in difficult-treating gold mine pretreating process, both at home and abroad
Scholar has carried out some research ozone oxidation Gold Concentrate under Normal Pressure, Mexico scholar F.Nava-Alonso and E.Elorza-
Rodriguez et al. pre-processes Pyrite-type Gold Concentrate under Normal Pressure at 2005, with ozone, the results showed that through the pretreated Huang of ozone
Iron ore type Gold Concentrate under Normal Pressure, Au-Ag leaching rate are obviously improved, and cyanide consumption amount greatly reduces, and extraction time is also obviously shortened；
Central South University's Guo Xue benefit et al. pre-processes difficult-treating gold mine containing antimony with ozone oxidation, and wherein the leaching rate of antimony is 98.13%, is added
Gold, leaching rate 70.17% are proposed after thiocarbamide.But the above technology needs higher reagent cost, and can generate secondary pollution,
When ozone Oxidation Treatment difficult-treating gold mine, although not add reagent additionally, oxidability is limited, wraps up in difficult-treating gold mine
The element oxides such as the iron pozzuolite of gold are not thorough, and it is not high to propose golden rate.Therefore, leaching rate and the shortening of gold can not only be improved by studying one kind
Leaching cycle, and the processing method that can also reduce reagent and operating cost has a very important significance.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the shortcomings of to mention in background above technology and defect, provide one
The method that kind utilizes ozone oxidation and microbiological oxidation Combined Treatment golden ore concentrate hard to treat can not only improve the leaching rate of gold and contracting
Short leaching cycle, and operating cost can also be reduced.
In order to solve the above technical problems, technical solution proposed by the present invention is to provide a kind of utilization ozone oxidation and microorganism
The method that oxidization combination handles golden ore concentrate hard to treat, includes the following steps:
(1) golden ore concentrate hard to treat is broken into after miberal powder and is mixed and made into ore pulp with deionized water；
(2) ore pulp made of the step (1) is passed through ozone and carries out ozone oxidation reaction, be then inoculated in ore pulp micro-
Biology carries out microbiological oxidation reaction；Or microbe inoculation progress microbiological oxidation is anti-in the ore pulp made of the step (1)
It answers, then passes to ozone and carry out ozone oxidation reaction；
(3) ore pulp obtained after the step (2) reaction is separated by solid-liquid separation, the liquid return step obtained after filtering
(1) ore pulp is made, the slag that obtains after filtering, which enters, to be mentioned the golden stage and carry out mentioning gold.
Above-mentioned method, it is preferred that in the step (1), the granularity of miberal powder is -0.044mm > 90%, refractory aurin
Mine includes one or more of pyrite, mispickel and chalcopyrite, the mass content of iron, arsenic, sulphur in golden ore concentrate hard to treat
Respectively greater than 5%, 3%, 5%.
Preferably, in ore pulp made of the step (1), mass concentration >=10% of solid mineral grains.
Preferably, in the step (2), the pH control of ozone oxidation reaction is 1-11, and the temperature of ozone oxidation reaction is
10-40℃。
Preferably, in the step (2), the ozone flow of ozone oxidation reaction is greater than 5g/Lh, ozone oxidation reaction
Time is 0.5-5h；It carries out continuing stirring, mixing speed 50-400rpm when ozone oxidation reaction.
Preferably, in the step (2), the concrete operations that microbe inoculation carries out microbiological oxidation reaction include following step
It is rapid: 9K culture medium solid is added in ore pulp, adjusts pH to 0.1-4, microbe inoculation carries out microbiological oxidation reaction, reaction temperature
Degree is 20-80 DEG C, when reaction a length of 1-15d.
Preferably, microorganism includes Acidithiobacillus ferrooxidans (Acidithiobacillus ferrooxidans)
With Acidithiobacillus thiooxidans (Acidithiobacillus thiooxidans), the concentration of microorganism is 3-10g/ in ore pulp
L.For the microorganism that the present invention uses for Acidithiobacillus ferrooxidans iron sulfur-oxidizing microorganisms, Acidithiobacillus thiooxidans are main
Aoxidize element sulphur, the Fe that these microorganisms generate3+And H+It, can be direct or indirect by elementary sulfur, iron in mineral with oxidation
Oxidation.
Preferably, it in the step (2), carries out first carrying out Air Exposure before microbiological oxidation reaction, Air Exposure
Shi Changwei 0.5-3h.
Preferably, it in the step (3), is separated by solid-liquid separation and is separated by solid-liquid separation using plate compression equipment or concentrator.
Preferably, in the step (3), slag wants manufactured ore pulp before mentioning gold, solid mineral grains in manufactured ore pulp
Mass concentration >=30%；Mention that gold uses proposes golden agent as one or more of Cymag, thiocarbamide, ferric sulfate and sodium peroxydisulfate,
Additive amount is 1-20g/L；The extraction time for mentioning gold is 1-8h.
The principle of the present invention is as follows:
For ozone as a kind of strong oxidizer, redox potential is about 2.07V, is only second to fluorine (2.5V), in addition to platinum,
Other than gold, iridium, fluorine, ozone can almost be reacted with all elements in the periodic table of elements；And its chemical combination bond energy amount is 47KJ/mol,
Since the chemical combination bond energy amount of most of molecules is 25-35, ozone is enough to open the chemical combination key of most molecules, while ozone is superpower
Oxidation oxidability aoxidize it can by gold mine 80% iron in 3h, its Strong oxdiative ability can aoxidize the short time
Various metals, sulfide and arsenic compound.
Golden ore concentrate hard to treat after ozone oxidation, it is easier to by the microbiological oxidation with oxidation susceptibility.Difficult gold
The pyrite mispickel on mine surface etc. is after ozone oxidation, and the aurin being exposed is mining, and microbiological treatment will greatly shorten its leaching
Period out, and the substances such as iron content sulfur-bearing in difficult-treating gold mine can be by ozone oxidation at Fe3+, the substances such as S, and then more easily quilt
Institute of Micro-biology utilizes.And the iron sulfur-oxidizing microorganisms being added are in acid condition (pH=0.1-4, preferably pH=1-3), by straight
It connects or indirect oxidation effect aoxidizes elementary sulfur, iron in mineral.Immediate reaction mechanism is microorganism adsorption in sulfide surface, and
And by secretion Ferroxidase, sulphur oxidizing ferment, directly acted on by biological enzyme by sulfide direct oxidation, generate metal from
Son, sulfuric acid simultaneously generate energy for microorganism growth metabolism.Indirect mechanism is the Fe generated by microorganism3+And H+It acts on
The covalent bond of sulphide ore leads to the decomposition of sulfide, releases Fe2+, it is then and by microbiological oxidation Fe3+, element sulphur or
Person's others reducible sulfur compound is oxidized to sulfuric acid, constitutes a redox leaching circulating system in this way, promotes pre- oxygen
Change the lasting progress of reaction, thoroughly the iron sulphur in gold mine is leached, the extraction time of difficult-treating gold mine can be greatly shortened, improves
The oxidation efficiency of gold mine increases accordingly the leaching rate of gold.
The difficult-treating gold mine of ozone oxidation is carried out again through microbiological oxidation, first through microorganism by directly or indirectly making
With the gold mine of pre-oxidation, Fe can be generated3+With elemental sulfur, elemental sulfur forms sulfuric acid after ozone oxidation, accelerates difficult-treating gold mine
The decomposition of middle pyrite mispickel, and Fe3+As oxidant, synergy ozone aoxidizes difficult-treating gold mine, can greatly speed up its aoxidize into
Journey shortens its extraction time.
Compared with prior art, the invention has the benefit that method of the invention, utilizes ozone Oxidation Treatment and micro- life
Object oxidation processes combine, and aoxidize pyrite, mispickel in Gold Concentrate under Normal Pressure, are passivated simple substance carbon, finally propose golden agent using thiocarbamide etc. and mention gold,
The leaching rate of gold is greatly improved, the liquid being obtained by filtration after separation of solid and liquid dilutes after treated by ozone for difficult-treating gold mine,
Extraction raffinate body is treated by ozone, reuse after neutralization precipitation；Generally speaking, method of the invention can not only greatly improve the leaching rate of gold
And shorten leaching cycle, and reagent and equipment cost can also be substantially reduced.
Specific embodiment
To facilitate the understanding of the present invention, the present invention is done below in conjunction with preferred embodiment and more comprehensively, is meticulously described,
But protection scope of the present invention is not limited to following specific embodiments.
Unless otherwise defined, all technical terms used hereinafter are generally understood meaning phase with those skilled in the art
Together.Technical term used herein is intended merely to the purpose of description specific embodiment, and it is of the invention to be not intended to limitation
Protection scope.
Unless otherwise specified, various raw material, reagent, the instrument and equipment etc. used in the present invention can pass through city
Field is commercially available or can be prepared by existing method.
Embodiment 1:
A kind of method of the invention using ozone oxidation and microbiological oxidation Combined Treatment golden ore concentrate hard to treat, is applied to
Xinjiang golden ore concentrate hard to treat, iron in Gold Concentrate under Normal Pressure, arsenic, sulphur, gold content be the content of 23.68%, 3.25%, 24.53%, Au
For 55.52g/t, it is that the miberal powder of -0.044mm > 90% carries out proposing golden experiment that Gold Concentrate under Normal Pressure, which is broken into granularity, is included the following steps:
(1) 50g Gold Concentrate under Normal Pressure and 500mL deionized water are sufficiently mixed, obtained ore pulp solution adds adjusting PH with base to 10；
(2) ozone being passed through by flow 10g/h in the above solution and carrying out oxidation reaction, which continues 1 hour, instead
Answering temperature is 30 DEG C, mixing speed 300rpm, and the Gold Concentrate under Normal Pressure obtained after processing carries out microbe inoculation after being aerated 2 hours；
(3) 9K culture medium solid component is then added in ore pulp, control pH is 2 or so, is inoculated with acidophilia ferrous oxide
Thiobacillus (Acidithiobacillus ferrooxidans) and Acidithiobacillus thiooxidans (Acidithiobacillus
Thiooxidans), make the concentration 5g/L of microorganism in ore pulp, carry out biooxidation reactions, reaction time 10d, stirring speed
Degree is 170rpm, and reaction temperature is 30 DEG C；
(4) it after aoxidizing 10d days, is separated by solid-liquid separation using plate compression equipment Gold Concentrate under Normal Pressure, pulp density is made in slag after filtering
The ore pulp that (mass concentrations of solid mineral grains in ore pulp) are 30% carries out thiourea gold extraction experiment, the additive amount point of thiocarbamide and ferric sulfate
Not Wei 10g/L and 3g/L, react 6h after, gold leaching rate 93.5%.
Direct with thiourea gold extraction (proposing golden rate 27.4%) compared to not preprocessed, the golden rate that mentions of the invention improves
66.1%；With thiourea gold extraction (proposing golden rate 79.3%) after the processing of more independent microbe-preoxidation gold, the golden rate that mentions of the invention is improved
14.2%；With thiourea gold extraction (proposing golden rate 82.3%) after more individually being pre-processed with ozone oxidation, the golden rate that mentions of the invention is improved
11.2%.And the present invention only needs the extraction time less than 11 days, is directly shortened with thiourea gold extraction compared to not preprocessed
7 days extraction times, while greatly reducing reagent and equipment cost.
Embodiment 2:
A kind of method of the invention using ozone oxidation and microbiological oxidation Combined Treatment golden ore concentrate hard to treat, is applied to
Yueyang, hunan Pingjiang River golden ore concentrate hard to treat, iron in Gold Concentrate under Normal Pressure, arsenic, sulphur, gold content be 32.98%, 22.81%,
The content of 31.13%, Au are 33.03g/t.It is that the miberal powder of -0.044mm > 90% carries out proposing golden experiment that Gold Concentrate under Normal Pressure, which is broken into granularity,
Include the following steps:
(1) certain Gold Concentrate under Normal Pressure and 500mL deionized water are sufficiently mixed by 50g, obtained ore pulp solution；
(2) 9K culture medium solid component is then added in ore pulp, control pH is 2 or so, is inoculated with acidophilia ferrous oxide
Thiobacillus (Acidithiobacillus ferrooxidans) and Acidithiobacillus thiooxidans (Acidithiobacillus
Thiooxidans), make the concentration 5g/L of microorganism in ore pulp, carry out biological pre-oxidation, reaction time 10d, mixing speed
For 170rpm, reaction temperature is 30 DEG C；
(3) ore pulp obtained after biological pre-oxidation (pH value is in acidity at this time) is passed through the ozone oxidation of 10g/h, the oxidation
Reaction continues 1 hour, and reaction temperature is 30 DEG C, mixing speed 300rpm；
(4) after ozone pre-oxidation, Gold Concentrate under Normal Pressure separation of solid and liquid is carried out using concentrator, pulp density is made in slag after filtering
The ore pulp that (mass concentrations of solid mineral grains in ore pulp) are 30% carries out thiourea gold extraction experiment, the additive amount point of thiocarbamide and ferric sulfate
Not Wei 10g/L and 3g/L, react 6h after, mention golden rate be 95%.
Direct with thiourea gold extraction (proposing golden rate 42.3%) compared to not preprocessed, the golden rate that mentions of the invention improves
52.7%；With thiourea gold extraction (proposing golden rate 86.4%) after the processing of more independent microbe-preoxidation gold, the golden rate that mentions of the invention is improved
8.6%；With thiourea gold extraction (proposing golden rate 81.2%) after more individually being pre-processed with ozone oxidation, the golden rate that mentions of the invention is improved
13.8%.And the present invention only needs the extraction time less than 11 days, is directly shortened with thiourea gold extraction compared to not preprocessed
7 days extraction times, while greatly reducing reagent and equipment cost.
Embodiment 3:
A kind of method of the invention using ozone oxidation and microbiological oxidation Combined Treatment golden ore concentrate hard to treat, is applied to
The difficult pyrite in the yueyang, hunan Pingjiang River, iron in Gold Concentrate under Normal Pressure, arsenic, sulphur, gold content be 33.48%, 25.85%,
The content of 29.16%, Au are 21.06g/t.It is that the miberal powder of -0.044mm > 90% carries out proposing golden experiment that Gold Concentrate under Normal Pressure, which is broken into granularity,
Include the following steps:
(1) 50g Gold Concentrate under Normal Pressure and 500mL deionized water are sufficiently mixed, obtained ore pulp solution；
(2) 9K culture medium solid component is then added in ore pulp, control pH is 2 or so, is inoculated with acidophilia ferrous oxide
Thiobacillus (Acidithiobacillus ferrooxidans) and Acidithiobacillus thiooxidans (Acidithiobacillus
Thiooxidans), make the concentration 5g/L of microorganism in ore pulp, carry out biological pre-oxidation, reaction time 10d, mixing speed
For 170rpm, reaction temperature is 30 DEG C；
(3) ore pulp obtained after biological pre-oxidation (pH value is in acidity at this time) is passed through 10g/h ozone and carries out oxidation reaction,
The oxidation reaction continues 3 hours, and reaction temperature is 30 DEG C, mixing speed 400rpm；
(4) after ozone pre-oxidation, Gold Concentrate under Normal Pressure separation of solid and liquid is carried out using concentrator, pulp density is made in slag after filtering
The ore pulp that (mass concentrations of solid mineral grains in ore pulp) are 30% carries out thiourea gold extraction experiment, the additive amount point of thiocarbamide and ferric sulfate
Not Wei 10g/L and 3g/L, react 6h after, mention golden rate be 92%.
Direct with thiourea gold extraction (proposing golden rate 44.3%) compared to not preprocessed, the golden rate that mentions of the invention improves
47.7%；With thiourea gold extraction (proposing golden rate 84.2%) after the processing of more independent microbe-preoxidation gold, the golden rate that mentions of the invention is improved
7.8%；With thiourea gold extraction (proposing golden rate 79.4%) after more individually being pre-processed with ozone oxidation, the golden rate that mentions of the invention is improved
12.6%.And the present invention only needs the extraction time less than 11 days, is directly shortened with thiourea gold extraction compared to not preprocessed
8 days extraction times, while greatly reducing reagent and equipment cost.
Embodiment 4:
A kind of method of the invention using ozone oxidation and microbiological oxidation Combined Treatment golden ore concentrate hard to treat, is applied to
Yueyang, hunan Pingjiang River stibnite, iron in concentrate, arsenic, bismuth, gold content be 10.22%, 20.64%, 40.51%, Au contains
Amount is 22.06g/t.It is that the miberal powder of -0.044mm > 90% carries out proposing golden experiment that Gold Concentrate under Normal Pressure, which is broken into granularity, is included the following steps:
(1) 50g Gold Concentrate under Normal Pressure and 500mL deionized water are sufficiently mixed, obtained ore pulp solution；
(2) 9K culture medium solid component is then added in ore pulp, adjusts pH to 2, is inoculated with acidophilia ferrous oxide sulphur bar
Bacterium (Acidithiobacillus ferrooxidans) and Acidithiobacillus thiooxidans (Acidithiobacillus
Thiooxidans), make the concentration 5g/L of microorganism in ore pulp, carry out biological pre-oxidation, reaction time 10d, mixing speed
For 170rpm, reaction temperature is 30 DEG C；
(3) then the ore pulp tune pH to 10 that will be obtained after biological pre-oxidation is passed through ozone by flow 10g/h and aoxidize instead
It answers, which continues 3 hours, and reaction temperature is 30 DEG C, mixing speed 400rpm；
(4) after ozone pre-oxidation, Gold Concentrate under Normal Pressure separation of solid and liquid is carried out using concentrator, pulp density is made in slag after filtering
The ore pulp that (mass concentrations of solid mineral grains in ore pulp) are 30% carries out thiourea gold extraction experiment, the additive amount point of thiocarbamide and ferric sulfate
Not Wei 10g/L and 3g/L, react 6h after, mention golden rate be 95.5%.
Direct with thiourea gold extraction (proposing golden rate 47%) compared to not preprocessed, the golden rate that mentions of the invention improves
48.5%；With thiourea gold extraction (proposing golden rate 77.7%) after the processing of more independent microbe-preoxidation gold, the golden rate that mentions of the invention is improved
17.8%；With thiourea gold extraction (proposing golden rate 80.9%) after more individually being pre-processed with ozone oxidation, the golden rate that mentions of the invention is improved
14.6%.And the present invention only needs the extraction time less than 11 days, is directly shortened with thiourea gold extraction compared to not preprocessed
12 days extraction times, while greatly reducing reagent and equipment cost
Comparative example 1:
A kind of processing method of golden ore concentrate hard to treat is applied to Xinjiang golden ore concentrate hard to treat, iron in Gold Concentrate under Normal Pressure, arsenic, sulphur,
The content of gold be 23.68%, 3.25%, the content of 24.53%, Au be 55.52g/t, by Gold Concentrate under Normal Pressure be broken into granularity for-
The miberal powder of 0.044mm > 90% carries out proposing golden experiment, includes the following steps:
(1) 50g Gold Concentrate under Normal Pressure and 500mL deionized water are sufficiently mixed, obtained ore pulp solution adds alkali pH to be adjusted to 2；
(2) Fe of 20g/L is added in the above solution3+Oxidation reaction is carried out, which continues 6 days, reaction temperature
It is 30 DEG C, mixing speed 400rpm, Gold Concentrate under Normal Pressure microbe inoculation after aeration 2 hours after processing；
(3) 9K culture medium solid component is then added in ore pulp, adjusts pH to 2, is inoculated with acidophilia ferrous oxide sulphur bar
Bacterium (Acidithiobacillus ferrooxidans) and Acidithiobacillus thiooxidans (Acidithiobacillus
Thiooxidans), make the concentration 5g/L of microorganism in ore pulp, carry out biological pre-oxidation, reaction time 10d, mixing speed
For 170rpm, reaction temperature is 30 DEG C；
(4) it after aoxidizing 10d days, is separated by solid-liquid separation using plate compression equipment Gold Concentrate under Normal Pressure, pulp density is made in slag after filtering
The ore pulp that (mass concentrations of solid mineral grains in ore pulp) are 30% carries out thiourea gold extraction experiment, the additive amount point of thiocarbamide and ferric sulfate
Not Wei 10g/L and 3g/L, react 6h after, gold leaching rate 86.4%.
This method directly adds iron ion as oxidant, after the elementary sulfur iron etc. in gold mine is aoxidized, then carries out micro- life
Object oxidation, the method is compared with method of the invention, and extraction time needs 16 days or more, extraction time was longer, and cost is higher, and
The leaching rate of gold is lower.
Comparative example 2:
A kind of preprocess method of golden ore concentrate hard to treat is applied to Xinjiang golden ore concentrate hard to treat, iron in Gold Concentrate under Normal Pressure, arsenic,
Sulphur, gold content be 23.68%, 3.25%, the content of 24.53%, Au be 55.52g/t, by Gold Concentrate under Normal Pressure be broken into granularity for-
The miberal powder of 0.044mm > 90% carries out proposing golden experiment, includes the following steps:
(1) 50g Gold Concentrate under Normal Pressure and 500mL deionized water are sufficiently mixed, obtained ore pulp solution adds adjusting PH with base to 10；
(2) ozone being passed through by flow 10g/h in the above solution and carrying out oxidation reaction, which continues 1 hour, instead
Answering temperature is 30 DEG C, and mixing speed 300rpm uses ferrous ions oxidation after Gold Concentrate under Normal Pressure after processing；
(3) Fe of 20g/L is added3+, ore pulp is adjusted into pH to 2, carries out chemical oxidation, oxidization time 14d, mixing speed
For 400rpm, reaction temperature is 30 DEG C；
(4) it is separated by solid-liquid separation using plate compression equipment Gold Concentrate under Normal Pressure, pulp density (solid mineral in ore pulp is made in slag after filtering
The mass concentration of grain) be 30% ore pulp carry out thiourea gold extraction experiment, the additive amount of thiocarbamide and ferric sulfate be respectively 10g/L with
3g/L, after reacting 6h, gold leaching rate 83%.
This method is combined with ozone oxidation with ferrous ions oxidation, and the method is compared with method of the invention, when leaching
Between need 14 days or more, extraction time will be grown, and cost is higher, and gold leaching rate it is lower.
Comparative example 3:
A kind of preprocess method of golden ore concentrate hard to treat is applied to yueyang, hunan Pingjiang River golden ore concentrate hard to treat, Gold Concentrate under Normal Pressure
Middle iron, arsenic, sulphur, gold content be 32.98%, 22.81%, the content of 31.13%, Au be 33.03g/t.Gold Concentrate under Normal Pressure is crushed
It is that the miberal powder of -0.044mm > 90% carries out proposing golden experiment at granularity, includes the following steps:
(1) 50g Gold Concentrate under Normal Pressure and 500mL deionized water are sufficiently mixed, obtained ore pulp solution adds alkali pH to be adjusted to 2；
(2) Fe of 20g/L is added in the above solution3+Oxidation reaction is carried out, which continues 6 days, reaction temperature
It is 30 DEG C, mixing speed 400rpm, Gold Concentrate under Normal Pressure microbe inoculation after aeration 2 hours after processing；
(3) 9K culture medium solid component is then added in ore pulp, adjusts pH to 2, is inoculated with acidophilia ferrous oxide sulphur bar
Bacterium (Acidithiobacillus ferrooxidans) and Acidithiobacillus thiooxidans (Acidithiobacillus
Thiooxidans), make the concentration 5g/L of microorganism in ore pulp, carry out biological pre-oxidation, reaction time 10d, mixing speed
For 170rpm, reaction temperature is 30 DEG C；
(4) after aoxidizing 10d days, Gold Concentrate under Normal Pressure separation of solid and liquid is carried out using concentrator, pulp density (mine is made in slag after filtering
The mass concentration of solid mineral grains in slurry) be 30% ore pulp carry out thiourea gold extraction experiment, the additive amount of thiocarbamide and ferric sulfate is distinguished
For 10g/L and 3g/L, after reacting 6h, gold leaching rate 85.4%.
This method directly adds iron ion as oxidant, after the elementary sulfur iron etc. in gold mine is aoxidized, then carries out micro- life
Object oxidation, the method is compared with method of the invention, and extraction time needs 16 days or more, extraction time was longer, and cost is higher, and
The leaching rate of gold is lower.
Claims (10)
1. a kind of method using ozone oxidation and microbiological oxidation Combined Treatment golden ore concentrate hard to treat, includes the following steps:
(1) golden ore concentrate hard to treat is broken into after miberal powder and is mixed and made into ore pulp with deionized water；
(2) ore pulp made of the step (1) is passed through ozone and carries out ozone oxidation reaction, then the microbe inoculation in ore pulp
Carry out microbiological oxidation reaction；Or microbe inoculation carries out microbiological oxidation reaction in the ore pulp made of the step (1), so
After be passed through ozone carry out ozone oxidation reaction；
(3) ore pulp obtained after the step (2) reaction is separated by solid-liquid separation, the liquid return step (1) obtained after filtering
Ore pulp is made, the slag that obtains after filtering, which enters, to be mentioned the golden stage and carry out mentioning gold.
2. the method according to claim 1, wherein in the step (1), the granularity of miberal powder be -0.044mm >
90%, golden ore concentrate hard to treat includes one or more of pyrite, mispickel and chalcopyrite, iron in golden ore concentrate hard to treat,
Arsenic, sulphur mass content be respectively greater than 5%, 3%, 5%.
3. the method according to claim 1, wherein in ore pulp made of the step (1), the matter of solid mineral grains
Measure concentration >=10%.
4. the method according to claim 1, wherein in the step (2), the pH control of ozone oxidation reaction is
1-11, the temperature of ozone oxidation reaction are 10-40 DEG C.
5. the method according to claim 1, wherein in the step (2), the ozone flow of ozone oxidation reaction
Greater than 5g/Lh, the time of ozone oxidation reaction is 0.5-5h；It carries out continuing stirring when ozone oxidation reaction, mixing speed is
50-400rpm。
6. the method according to claim 1, wherein microbe inoculation carries out microorganism oxygen in the step (2)
The concrete operations for changing reaction include the following steps: to be added 9K culture medium solid in ore pulp, adjust pH to 0.1-4, are inoculated with micro- life
Object carries out microbiological oxidation reaction, and reaction temperature is 20-80 DEG C, when reaction a length of 1-15d.
7. according to the method described in claim 6, it is characterized in that, microorganism includes that acidophilia oxidation is sub- in the step (2)
Iron Thiobacillus (Acidithiobacillus ferrooxidans) and Acidithiobacillus thiooxidans (Acidithiobacillus
Thiooxidans), the concentration of microorganism is 3-10g/L in ore pulp.
8. method according to any one of claims 1-7, which is characterized in that in the step (2), carry out microorganism oxygen
Air Exposure is first carried out before changing reaction, the when a length of 0.5-3h of Air Exposure.
9. method according to any one of claims 1-7, which is characterized in that in the step (3), be separated by solid-liquid separation and use
Plate compression equipment or concentrator are separated by solid-liquid separation.
10. method according to any one of claims 1-7, which is characterized in that in the step (3), propose mine before gold
Slag wants manufactured ore pulp, mass concentration >=30% of solid mineral grains in manufactured ore pulp；Mention gold use mention golden agent for Cymag,
One or more of thiocarbamide, ferric sulfate and sodium peroxydisulfate, additive amount 1-20g/L；The extraction time for mentioning gold is 1-8h.
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