CN106702155A - Method for improving bacterial oxidation efficiency of high-sulfur refractory gold ores through low-power-consumption microwave activation - Google Patents
Method for improving bacterial oxidation efficiency of high-sulfur refractory gold ores through low-power-consumption microwave activation Download PDFInfo
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- CN106702155A CN106702155A CN201611138648.0A CN201611138648A CN106702155A CN 106702155 A CN106702155 A CN 106702155A CN 201611138648 A CN201611138648 A CN 201611138648A CN 106702155 A CN106702155 A CN 106702155A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
- C22B3/18—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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention provides a method for improving the bacterial oxidation efficiency of high-sulfur refractory gold ores through low-power-consumption microwave activation. The method for improving the bacterial oxidation efficiency of the high-sulfur refractory gold ores through low-power-consumption microwave activation comprises the following steps that the high-sulfur refractory gold ores are ground to reach the degree that the quantity of particles with the granularity being 38-75 microns accounts for 90% or above; the well ground high-sulfur refractory gold ores are evenly mixed with an activation medium, and the pH value is adjusted to be 1.0-4.0; the ore pulp is placed in a microwave oven to undergo normal-pressure microwave activation for 30-600 seconds, wherein the microwave frequency is 2450 MHz, the microwave power is 50-1000 w, the microwave activation temperature is 25-60 DEG C, and the stirring speed of the ore pulp is 100-400 rpm; and the activated ore pulp is mixed with a bacteria solution, air is fed, and an oxidation reaction is conducted. By the adoption of the method for improving the bacterial oxidation efficiency of the high-sulfur refractory gold ores through low-power-consumption microwave activation, after the high-sulfur refractory gold ores are activated for 30-600 seconds through microwave, compared with the bacterial oxidation period of the ores which do not undergo microwave activation, the bacterial oxidation period is shortened by 25%-30%; and the deferrization rate, the desulfurization rate and the dearsenization rate are all improved.
Description
Technical field
The invention belongs to technical field of wet metallurgy, and in particular to a kind of low-power consumption microwave activation high-sulfur difficult-treating gold mine is carried
The method of bacterial oxidation efficiency high.
Background technology
With a large amount of exploitations of gold resource, easily adopt that disposable gold ore resource is increasingly exhausted, difficult-treating gold mine has become
One of main mineral resources of China's golden production, high-sulfur difficult-treating gold mine is one type.PREPROCESSING OF A REFRACTORY GOLD be it is a kind of both
Environmental protection and the technology of effective treatment high-sulfur difficult-treating gold mine, but the technology has that oxidation cycle is long, it is macrocyclic thin
Bacterium oxidation not only increases industrial difficulty, more reduces industrial efficiency.Therefore, bacterial oxidation week how is shortened
Phase, a great problem that bacterial oxidation efficiency has become the field face is improved, the solution of the problem is to industrial production meaning weight
Greatly.
The content of the invention
For the problem that prior art is present, the present invention provides a kind of low-power consumption microwave activation high-sulfur difficult-treating gold mine and improves
The method of bacterial oxidation efficiency.The technical solution adopted by the present invention is：
A kind of method that low-power consumption microwave activation high-sulfur difficult-treating gold mine improves bacterial oxidation efficiency, comprises the following steps：
High-sulfur difficult-treating gold mine is ground to granularity and reaches more than 90% in 38 ~ 75 μm of particle；
Ground high-sulfur difficult-treating gold mine is well mixed with activated media, regulation pH value is 1.0 ~ 4.0；
Ore pulp is placed in normal pressure microwave in micro-wave oven and activates 30 ~ 600s, wherein microwave frequency is 2450 MHz, and microwave power is 50
~ 1000w, microwave activation temperature is 25 ~ 60 DEG C, and the mixing speed of ore pulp is 100 ~ 400rpm；
Activation ore pulp is mixed with bacterium solution, being passed through air carries out oxidation reaction.
In the above method, the activated media is water, and amount of water is dense with the mixed ore pulp of high-sulfur difficult-treating gold mine and water
Degree is defined 5 ~ 30%.
In the above method, the condition of the oxidation reaction is：Activation ore pulp is dense in activation ore pulp with bacterium solution mixed liquor
It is 5 ~ 20% to spend, and air mass flow is 0.1 ~ 0.4m3·h-1, mixing speed is 500 ~ 1500rpm, and oxidizing temperature is 40 ~ 60 DEG C, is adjusted
Section pH value is 1.0~1.8.
In the above method, the medium of the regulation pH value is the concentrated sulfuric acid that volume fraction is 50%.
Beneficial effects of the present invention are：
1st, after the present invention activates 30 ~ 600 s using microwave to high-sulfur difficult-treating gold mine, the bacterial oxidation cycle without microwave compared with than living
Change the bacterial oxidation cycle time 25% ~ 30% of mineral, and deferrization rate improves more than 15%, and desulfurization degree improves more than 16%, dearsenification
Rate improves more than 5.5%；
2nd, microwave activation temperature of the present invention is relatively low, is 25 ~ 60 DEG C, and is to carry out at ambient pressure, the condition of whole technical process
Gently, it is easy to operate.
Specific embodiment
The high-sulfur difficult-treating gold mine Contents of Main Components used in the embodiment of the present invention is as follows：
| Element | Fe | S | As |
| Content/% | 33.89 | 35.30 | 1.77 |
It is pure that the reagent used in the embodiment of the present invention is analysis.
Unit type in the embodiment of the present invention used by ore grinding is omnidirectional planetary ball mill QM-QX types.
The pH meter used in the embodiment of the present invention is the thunder magnetic portable pH meter of PHBJ-260 types.
The present invention is described in further details with reference to specific embodiment, it is described be explanation of the invention rather than
Limit.
Embodiment 1
A kind of method that low-power consumption microwave activation high-sulfur difficult-treating gold mine improves bacterial oxidation efficiency, comprises the following steps：
（1）High-sulfur difficult-treating gold mine is ground to granularity and reaches more than 90% in 75 μm of particle；
（2）Ground high-sulfur difficult-treating gold mine is well mixed with water, the ore pulp solution that concentration is 20% is configured to, volume is used
Fraction be 50% the concentrated sulfuric acid adjust pH value 4.0；
（3）Ore pulp is placed in normal pressure microwave activation 600s in micro-wave oven, wherein microwave frequency is 2450 MHz, and microwave power is
50w, microwave activation temperature is 25 DEG C, and the mixing speed of ore pulp is 100rpm；
（4）Activation ore pulp is mixed with bacterium solution, being passed through air carries out oxidation reaction, and the condition of oxidation reaction is：Activation ore pulp exists
Activation ore pulp is 20% with the concentration in bacterium solution mixed liquor, and air mass flow is 0.1m3·h-1, mixing speed is 1500rpm, oxidation
Temperature be 55 DEG C, volume fraction be 50% the concentrated sulfuric acid regulation pH value be 1.0.
Experimental result：The present embodiment activates 25 % of the bacterial oxidation cycle time of ore pulp, and bacterial oxidation index is further
Improve：Deferrization rate improves 15.34%, and desulfurization degree improves 16.32%, and arsenic-removing rate improves 5.58%.Table 1 provides raw ore and this reality
Apply essential element content results in the activation ore pulp of example；Table 2 directly carries out bacterial oxidation and uses the present embodiment there is provided raw ore
Process the weight-loss ratio result of the leached mud for obtaining；Table 3 is directly carried out bacterial oxidation and is processed with using the present embodiment there is provided raw ore
The essential element content results of the leached mud of acquisition：
The raw ore of table 1 and essential element content in the activation ore pulp of the present embodiment
| Fe | S | As | |
| Raw ore | 33.89 | 35.30 | 1.77 |
| Activation ore pulp | 34.05 | 36.32 | 1.83 |
The raw ore of table 2 directly carries out the weight-loss ratio result of bacterial oxidation and the leached mud obtained using the present embodiment treatment
| Raw ore bioleaching slag | The present embodiment bioleaching slag | |
| Weight-loss ratio/% | 36.09 | 39.70 |
The raw ore of table 3 directly carries out the essential element content of bacterial oxidation and the leached mud obtained using the present embodiment treatment
| Fe | S | As | |
| Raw ore bioleaching slag | 22.53 | 24.88 | 0.418 |
| The present embodiment bioleaching slag | 15.33 | 17.30 | 0.265 |
Embodiment 2
A kind of method that low-power consumption microwave activation high-sulfur difficult-treating gold mine improves bacterial oxidation efficiency, comprises the following steps：
（1）High-sulfur difficult-treating gold mine is ground to granularity and reaches more than 90% in 45 μm of particle；
（2）Ground high-sulfur difficult-treating gold mine is well mixed with water, the ore pulp solution that concentration is 15% is configured to, volume is used
Fraction be 50% the concentrated sulfuric acid adjust pH value 3.0；
（3）Ore pulp is placed in normal pressure microwave activation 100s in micro-wave oven, wherein microwave frequency is 2450 MHz, and microwave power is
500w, microwave activation temperature is 45 DEG C, the mixing speed of ore pulp is 200rpm；
（4）Activation ore pulp is mixed with bacterium solution, being passed through air carries out oxidation reaction, and the condition of oxidation reaction is：Activation ore pulp exists
Activation ore pulp is 10% with the concentration in bacterium solution mixed liquor, and air mass flow is 0.3m3·h-1, mixing speed is 1000rpm, oxidation
Temperature be 50 DEG C, volume fraction be 50% the concentrated sulfuric acid regulation pH value be 1.5.
Experimental result：The present embodiment activates 26.50 % of the bacterial oxidation cycle time of ore pulp, and bacterial oxidation index enters one
Step is improved：Deferrization rate improves 19.46%, and desulfurization degree improves 20.01%, and arsenic-removing rate improves 9.56%.Table 4 provides raw ore and this reality
Apply essential element content results in the activation ore pulp of example；Table 5 directly carries out bacterial oxidation and uses the present embodiment there is provided raw ore
Process the weight-loss ratio result of the leached mud for obtaining；Table 6 is directly carried out bacterial oxidation and is processed with using the present embodiment there is provided raw ore
The essential element content results of the leached mud of acquisition：
The raw ore of table 4 and essential element content in the activation ore pulp of the present embodiment
| Fe | S | As | |
| Raw ore | 33.89 | 35.30 | 1.77 |
| Activation ore pulp | 34.35 | 37.02 | 1.88 |
The raw ore of table 5 directly carries out the weight-loss ratio of bacterial oxidation and the leached mud obtained using the present embodiment treatment
| Raw ore bioleaching slag | The present embodiment bioleaching slag | |
| Weight-loss ratio/% | 36.09 | 41.68 |
The raw ore of table 6 directly carries out the essential element content of bacterial oxidation and the leached mud obtained using the present embodiment treatment
| Fe | S | As | |
| Raw ore bioleaching slag | 22.53 | 24.88 | 0.418 |
| The present embodiment bioleaching slag | 13.56 | 15.89 | 0.163 |
Embodiment 3
A kind of method that low-power consumption microwave activation high-sulfur difficult-treating gold mine improves bacterial oxidation efficiency, comprises the following steps：
（1）High-sulfur difficult-treating gold mine is ground to granularity and reaches more than 90% in 38 μm of particle；
（2）Ground high-sulfur difficult-treating gold mine is well mixed with water, the ore pulp solution that concentration is 10% is configured to, volume is used
Fraction be 50% the concentrated sulfuric acid adjust pH value 1.5；
（3）Ore pulp is placed in normal pressure microwave activation 30s in micro-wave oven, wherein microwave frequency is 2450 MHz, and microwave power is
1000w, microwave activation temperature is 55 DEG C, and the mixing speed of ore pulp is 400rpm；
（4）Activation ore pulp is mixed with bacterium solution, being passed through air carries out oxidation reaction, and the condition of oxidation reaction is：Activation ore pulp exists
Activation ore pulp is 5% with the concentration in bacterium solution mixed liquor, and air mass flow is 0.4m3·h-1, mixing speed is 500rpm, oxidation temperature
It is 45 DEG C to spend, volume fraction be 50% the concentrated sulfuric acid regulation pH value be 1.8.
Experimental result：The present embodiment activates 30 % of the bacterial oxidation cycle time of ore pulp, and bacterial oxidation index is further
Improve：Deferrization rate improves 23.52%, and desulfurization degree improves 25.01%, and arsenic-removing rate improves 11.33%.Table 7 provides raw ore and this implementation
Essential element content results in the activation ore pulp of example；Table 8 directly carries out bacterial oxidation and uses at the present embodiment there is provided raw ore
Manage the weight-loss ratio result of the leached mud for obtaining；Table 9 is directly carried out bacterial oxidation and is obtained with using the present embodiment treatment there is provided raw ore
The essential element content results of the leached mud for obtaining：
The raw ore of table 7 and essential element content in the activation ore pulp of the present embodiment
| Fe | S | As | |
| Raw ore | 33.89 | 35.30 | 1.77 |
| Activation ore pulp | 35.01 | 37.89 | 1.93 |
The raw ore of table 8 directly carries out the weight-loss ratio of bacterial oxidation and the leached mud obtained using the present embodiment treatment
| Raw ore bioleaching slag | The present embodiment bioleaching slag | |
| Weight-loss ratio/% | 36.09 | 45.30 |
The raw ore of table 9 directly carries out the essential element content of bacterial oxidation and the leached mud obtained using the present embodiment treatment
| Fe | S | As | |
| Raw ore bioleaching slag | 22.53 | 24.88 | 0.418 |
| The present embodiment bioleaching slag | 12.14 | 13.87 | 0.116 |
In sum, high-sulfur difficult-treating gold mine is activated using the present invention, easy to operate, energy-saving, energy utilization fills
Point, can significantly shorten the bacterial oxidation cycle, improve bacterial oxidation index.
Claims (4)
1. a kind of method that low-power consumption microwave activation high-sulfur difficult-treating gold mine improves bacterial oxidation efficiency, it is characterised in that including with
Lower step：
High-sulfur difficult-treating gold mine is ground to granularity and reaches more than 90% in 38 ~ 75 μm of particle；
Ground high-sulfur difficult-treating gold mine is well mixed with activated media, regulation pH value is 1.0 ~ 4.0；
Ore pulp is placed in normal pressure microwave in micro-wave oven and activates 30 ~ 600s, wherein microwave frequency is 2450 MHz, and microwave power is 50
~ 1000w, microwave activation temperature is 25 ~ 60 DEG C, and the mixing speed of ore pulp is 100 ~ 400rpm；
Activation ore pulp is mixed with bacterium solution, being passed through air carries out oxidation reaction.
2. a kind of low-power consumption microwave activation high-sulfur difficult-treating gold mine according to claim 1 improves the side of bacterial oxidation efficiency
Method, it is characterised in that the activated media is water, amount of water with high-sulfur difficult-treating gold mine and the mixed pulp density of water 5 ~
30% is defined.
3. a kind of low-power consumption microwave activation high-sulfur difficult-treating gold mine according to claim 1 improves the side of bacterial oxidation efficiency
Method, it is characterised in that the condition of the oxidation reaction is：Concentration of the activation ore pulp in activation ore pulp and bacterium solution mixed liquor for 5 ~
20%, air mass flow is 0.1 ~ 0.4m3·h-1, mixing speed is 500 ~ 1500rpm, and oxidizing temperature is 40 ~ 60 DEG C, adjusts pH value
It is 1.0~1.8.
4. a kind of low-power consumption microwave activation high-sulfur difficult-treating gold mine according to claim 1 or 3 improves bacterial oxidation efficiency
Method, it is characterised in that the medium of the regulation pH value is the concentrated sulfuric acid that volume fraction is 50%.
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