CN106702155B - The method that low-power consumption microwave activation high-sulfur difficult-treating gold mine improves bacterial oxidation efficiency - Google Patents
The method that low-power consumption microwave activation high-sulfur difficult-treating gold mine improves bacterial oxidation efficiency Download PDFInfo
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- CN106702155B CN106702155B CN201611138648.0A CN201611138648A CN106702155B CN 106702155 B CN106702155 B CN 106702155B CN 201611138648 A CN201611138648 A CN 201611138648A CN 106702155 B CN106702155 B CN 106702155B
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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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Abstract
The present invention provides 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 with activated media is uniformly mixed, adjusts pH value 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, and microwave activation temperature is 25 ~ 60 DEG C, and the mixing speed of ore pulp is 100 ~ 400rpm；Activation ore pulp with bacterium solution is mixed, air is passed through and carries out oxidation reaction.After the present invention activates 30 ~ 600 s using microwave to high-sulfur difficult-treating gold mine, the bacterial oxidation cycle is compared with the bacterial oxidation cycle time 25% ~ 30% than activating mineral without microwave, and deferrization rate, desulfurization degree and arsenic-removing rate improve.
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 carries
The method of high bacterial oxidation efficiency.
Background technology
With a large amount of exploitations of gold resource, easily adopt that disposable gold ore resource is increasingly exhausted, and difficult-treating gold mine has become
One of main mineral resources of China's golden production, high-sulfur difficult-treating gold mine are one type.PREPROCESSING OF A REFRACTORY GOLD be it is a kind of both
Environmental protection and the technology of effective processing high-sulfur difficult-treating gold mine, but the technology there are oxidation cycle it is long the problem of, it is macrocyclic thin
Bacterium oxidation not only increases industrial difficulty, more reduces industrial efficiency.Therefore, bacterial oxidation week how is shortened
Phase improves a great problem that bacterial oxidation efficiency has become the field face, and the solution of the problem is to industrial production meaning weight
Greatly.
The content of the invention
In view of the problems of the existing technology, 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 with activated media is uniformly mixed, adjusts pH value 1.0 ~ 4.0；
Ore pulp is placed in micro-wave oven normal pressure microwave and activates 30 ~ 600s, wherein microwave frequency is 2450 MHz, microwave power
For 50 ~ 1000w, microwave activation temperature is 25 ~ 60 DEG C, and the mixing speed of ore pulp is 100 ~ 400rpm；
Activation ore pulp with bacterium solution is mixed, air is passed through and carries out oxidation reaction.
In the above method, the activated media is water, and amount of water is dense with high-sulfur difficult-treating gold mine and the mixed ore pulp of water
Degree is subject to 5 ~ 30%.
In the above method, the condition of the oxidation reaction is：Activate ore pulp activation ore pulp with it is dense in bacterium solution mixed liquor
It spends 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, is adjusted
It is 1.0~1.8 to save pH value.
In the above method, the medium of the adjusting 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 is compared with than without micro-
Ripple activates the bacterial oxidation cycle time 25% ~ 30% of mineral, and deferrization rate improves more than 15%, and desulfurization degree improves more than 16%,
Arsenic-removing 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 under normal pressure, entire technical process
Mild condition, 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 |
The reagent used in the embodiment of the present invention is that analysis is pure.
Unit type in the embodiment of the present invention used in ore grinding is omnidirectional planetary ball mill QM-QX types.
The pH meter used in the embodiment of the present invention is the portable pH meter of thunder magnetic 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
It limits.
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 with water is uniformly mixed, the ore pulp solution that concentration is 20% is configured to, uses
The concentrated sulfuric acid that volume fraction is 50% adjusts pH value 4.0；
（3）Ore pulp is placed in micro-wave oven normal pressure microwave and activates 600s, wherein microwave frequency is 2450 MHz, microwave power
For 50w, microwave activation temperature is 25 DEG C, and the mixing speed of ore pulp is 100rpm；
（4）Activation ore pulp with bacterium solution is mixed, air is passed through and carries out oxidation reaction, the condition of oxidation reaction is：Activate ore deposit
It is 20% to starch in activation ore pulp and the concentration in bacterium solution mixed liquor, air mass flow 0.1m3·h-1, mixing speed 1500rpm,
Oxidizing temperature is 55 DEG C, and it is 1.0 that the concentrated sulfuric acid that volume fraction is 50%, which adjusts pH value,.
Experimental result：It is further that the present embodiment activates the bacterial oxidation cycle time of ore pulp 25 %, bacterial oxidation index
It improves：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 provides raw ore and directly carries out bacterial oxidation with using the present embodiment
Handle the weight-loss ratio result of the leached mud obtained；Table 3 is provided raw ore and directly carries out bacterial oxidation with being handled using the present embodiment
The essential element content results of the leached mud of acquisition：
Essential element content in the activation ore pulp of 1 raw ore of table and the present embodiment
| Fe | S | As | |
| Raw ore | 33.89 | 35.30 | 1.77 |
| Activate ore pulp | 34.05 | 36.32 | 1.83 |
2 raw ore of table directly carries out bacterial oxidation and the weight-loss ratio result of the leached mud obtained using the present embodiment processing
| Raw ore bioleaching slag | The present embodiment bioleaching slag | |
| Weight-loss ratio/% | 36.09 | 39.70 |
3 raw ore of table directly carries out bacterial oxidation and the essential element content of the leached mud obtained using the present embodiment processing
| 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 with water is uniformly mixed, the ore pulp solution that concentration is 15% is configured to, uses
The concentrated sulfuric acid that volume fraction is 50% adjusts pH value 3.0；
（3）Ore pulp is placed in micro-wave oven normal pressure microwave and activates 100s, wherein microwave frequency is 2450 MHz, microwave power
For 500w, microwave activation temperature is 45 DEG C, the mixing speed of ore pulp is 200rpm；
（4）Activation ore pulp with bacterium solution is mixed, air is passed through and carries out oxidation reaction, the condition of oxidation reaction is：Activate ore deposit
It is 10% to starch in activation ore pulp and the concentration in bacterium solution mixed liquor, air mass flow 0.3m3·h-1, mixing speed 1000rpm,
Oxidizing temperature is 50 DEG C, and it is 1.5 that the concentrated sulfuric acid that volume fraction is 50%, which adjusts pH value,.
Experimental result：26.50 % of bacterial oxidation cycle time of the present embodiment activation ore pulp, bacterial oxidation index is into one
Step improves：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 provides raw ore and directly carries out bacterial oxidation with using the present embodiment
Handle the weight-loss ratio result of the leached mud obtained；Table 6 is provided raw ore and directly carries out bacterial oxidation with being handled using the present embodiment
The essential element content results of the leached mud of acquisition：
Essential element content in the activation ore pulp of 4 raw ore of table and the present embodiment
| Fe | S | As | |
| Raw ore | 33.89 | 35.30 | 1.77 |
| Activate ore pulp | 34.35 | 37.02 | 1.88 |
5 raw ore of table directly carries out bacterial oxidation and the weight-loss ratio of the leached mud obtained using the present embodiment processing
| Raw ore bioleaching slag | The present embodiment bioleaching slag | |
| Weight-loss ratio/% | 36.09 | 41.68 |
6 raw ore of table directly carries out bacterial oxidation and the essential element content of the leached mud obtained using the present embodiment processing
| 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 with water is uniformly mixed, the ore pulp solution that concentration is 10% is configured to, uses
The concentrated sulfuric acid that volume fraction is 50% adjusts pH value 1.5；
（3）Ore pulp is placed in micro-wave oven normal pressure microwave and activates 30s, wherein microwave frequency is 2450 MHz, microwave power
For 1000w, microwave activation temperature is 55 DEG C, and the mixing speed of ore pulp is 400rpm；
（4）Activation ore pulp with bacterium solution is mixed, air is passed through and carries out oxidation reaction, the condition of oxidation reaction is：Activate ore deposit
It is 5% to starch in activation ore pulp and the concentration in bacterium solution mixed liquor, air mass flow 0.4m3·h-1, mixing speed 500rpm, oxygen
It is 45 DEG C to change temperature, and it is 1.8 that the concentrated sulfuric acid that volume fraction is 50%, which adjusts pH value,.
Experimental result：It is further that the present embodiment activates the bacterial oxidation cycle time of ore pulp 30 %, bacterial oxidation index
It improves：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 provides raw ore and directly carries out bacterial oxidation with using at the present embodiment
Manage the weight-loss ratio result of the leached mud obtained；Table 9 is provided raw ore and directly carries out bacterial oxidation with being obtained using the present embodiment processing
The essential element content results of the leached mud obtained：
Essential element content in the activation ore pulp of 7 raw ore of table and the present embodiment
| Fe | S | As | |
| Raw ore | 33.89 | 35.30 | 1.77 |
| Activate ore pulp | 35.01 | 37.89 | 1.93 |
8 raw ore of table directly carries out bacterial oxidation and the weight-loss ratio of the leached mud obtained using the present embodiment processing
| Raw ore bioleaching slag | The present embodiment bioleaching slag | |
| Weight-loss ratio/% | 36.09 | 45.30 |
9 raw ore of table directly carries out bacterial oxidation and the essential element content of the leached mud obtained using the present embodiment processing
| 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 conclusion high-sulfur difficult-treating gold mine is activated using the present invention, easy to operate, energy-saving, energy profit
It with abundant, can significantly shorten the bacterial oxidation cycle, improve bacterial oxidation index.
Claims (3)
1. the method that a kind of 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 with activated media is uniformly mixed, adjusts pH value 1.0~4.0；The activation is situated between
Matter is water, amount of water be subject to high-sulfur difficult-treating gold mine with the mixed pulp density of water 5~30%；
Ore pulp is placed in micro-wave oven normal pressure microwave and activates 30~600s, wherein microwave frequency is 2450MHz, microwave power 50
~1000w, microwave activation temperature are 25~60 DEG C, and the mixing speed of ore pulp is 100~400rpm；
Activation ore pulp with bacterium solution is mixed, air is passed through and 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 condition of the oxidation reaction is：Activate concentration of the 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, is adjusted
PH value is 1.0~1.8.
3. a kind of low-power consumption microwave activation high-sulfur difficult-treating gold mine according to claim 1 or 2 improves bacterial oxidation efficiency
Method, it is characterised in that the medium for adjusting pH value is the concentrated sulfuric acid that volume fraction is 50%.
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