CN109706310A - A kind of carbon containing, arsenic refractory gold ore low temperature oxygen-enriched air roasting pre-processes-leach extraction of gold process - Google Patents
A kind of carbon containing, arsenic refractory gold ore low temperature oxygen-enriched air roasting pre-processes-leach extraction of gold process Download PDFInfo
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Abstract
Pre-process the invention discloses a kind of carbon containing, arsenic refractory gold ore low temperature oxygen-enriched air roasting-leach extraction of gold process, low temperature oxygen-enriched air roasting main equipment uses rotary roaster, the roaster is using external heating, low temperature oxygen-enriched air roasting environment (300-550 DEG C) is established by control revolution oven air flow rate and flow velocity simultaneously, and it is rotated by furnace body and realizes that material uniformly roasts, pozzuolite compound in decomposing ore, make the exposed dissociation of the micro-fine-grained gold being wrapped in pozzuolite compound, while complete oxidation eliminates the organic carbon in ore；Cooling that calcining after roasting passes through plus water is sized mixing, and leach using environmental protection leaching gold reagent CG505 and mention Jin Zuoye, in leachate gold it is recovered after, the adjusted return leaching system of lean solution, phase analysis is stored in Tailings Dam as general solid waste heap, flue gas after roasting fully absorbs the objectionable impurities such as remaining arsenic oxide in baking flue gas using the method suction of alkali liquor efficient spray, realizes qualified discharge.
Description
Technical field
The invention belongs to ore technology for gold extraction fields, and in particular to a kind of carbon containing, arsenic refractory gold ore low temperature is oxygen-enriched
Roasting pretreatment-leaching extraction of gold process.
Background technique
In recent years, with the fast development of gold industry, the gold ore resource on the one hand easily extracted is increasingly exhausted, intractable
Gold ore resource has become at present and the primary raw material of gold industry from now on, and gold is in certain difficult-treating gold mines with microfine and package
The form organic carbon etc. for being unfavorable for leaching that is present in mispickel, and contains.Wherein gold is because of physically encapsulation, chemistry knot
It closes, chemical cover film wraps up and must could be efficiently extracted out by pretreated method；Currently, refractory gold ore
Preprocess method mainly have three kinds of roasting, biological oxidation, hot-pressure oxidation pretreating process, wherein biological oxidation pretreatment technique
Process cycle is longer, and production cost is higher, can not completely eliminate organic carbon in ore and rob gold influence, need to add in leaching process
Active carbon competitive Adsorption can just effectively improve Gold leaching index；Although hot-press oxidization pretreatment treatment effect is preferable, it is produced
Higher cost needs just to be able to achieve using extraordinary press device, and the requirement to prevailing pressure equipment and ancillary equipment is all higher, deposits
In the drawbacks such as cost of investment is larger；Roasting pretreatment technique have it is easy to operate, low for equipment requirements, vulcanization can be completely eliminated
The advantages that object and organic carbon influence, are applied widely, but traditional its temperature of fluidized bed roasting pretreating process control is higher, one
As at 650 DEG C or more, the reason is that material reaction speed quickly, can not realize that the dynamic of heat is flat in low temperature under fluidized state
Weighing apparatus, and then cannot achieve low temperature control；And carbon containing, arsenic refractory gold ore uses roasting pretreatment, it is high if maturing temperature is excessively high
When 550 DEG C, organic carbon and the meeting rapid oxidation heat release of arsenic sulfide mineral will lead to burning and formed to golden secondary capsulation, to rear
Continuous Gold leaching generates adverse effect, therefore the type gold ore should be had by the way of low temperature (300-550 DEG C) roasting pretreatment
Effect recycles gold therein, and the pozzuolite compound and organic carbon in gold ore are oxygenolysis under lower temperature (300-550 DEG C), makes
It is wrapped in the sufficiently exposed dissociation of micro-fine-grained gold therein, wherein pozzuolite compound is largely deposited after oxygen-rich oxide with arsenate form
It is in calcining, reduces the burden of subsequent fume treatment, organic carbon will be fully oxidized elimination in roasting process, and the two of generation
Carbonoxide effect on environment is more minimum, although traditional rotary kiln baking mode can be run at low temperature in the prior art,
But because its heating method is heated using the fuel for spraying into hot gas or burning into kiln, cause heating uneven, material in kiln
Temperature fluctuation is larger, therefore how controlling carbon containing, arsenic refractory gold ore and roasting in a low temperature of stabilization is that current urgent need solves
The problem of.
Summary of the invention
In order to overcome the above problem, the present invention provides carbon containing, arsenic refractory gold ore the low temperature oxygen-enriched air roasting of one kind and locates in advance
Reason-leaching extraction of gold process, the low temperature refer to temperature between 300-550 DEG C, solve traditional rotary kiln baking heating
Unevenly, temperature of charge fluctuates larger problem in kiln, effectively controls maturing temperature and at 300-550 DEG C and is evenly heated, makes to wrap
It is wrapped in the sufficiently exposed dissociation of micro-fine-grained gold therein, improves the rate of recovery of gold, while mitigating the pollution to environment.
The present invention roasts main equipment and uses rotary roaster, heating device is set on rotary roaster, and solid
It outside furnace body, is not rotated together with furnace body, which is to heat ring with the socket type of insulating layer and insulating layer, is added
Hot ring is heatable after being powered, and realizes and heats to rotary roaster furnace body, and furnace interior is equipped with temperature-detecting device and inflation system
System, inflation system can be filled at different flow rates air into furnace, temperature-detecting device, heating device and inflation system with temperature
Spend control system control connection；According to ore properties, maturing temperature target value is determined, temperature control system control heating device is opened
It opens, is heated, when in-furnace temperature exceeds target value, temperature control system controls inflation system and increases aeration quantity, drops simultaneously
Low heating devices heat power stops heating；When in-furnace temperature is lower than target value, temperature control system controls inflation system
It reduces aeration quantity, reduce the flow velocity of inflation, while increasing the heating power of heating device；So circulation realizes roasting environment
Heat dynamic equilibrium guarantees the roasting environment of oxygen-enriched state while low temperature, that is, 300-550 DEG C, and oxygen-enriched state into furnace to be filled with
It needs air capacity and the excess air of specific coefficient of excess product can be realized through theory, and is rotated by furnace body and realize that material is uniform
It roasts, the pozzuolite compound in decomposing ore, makes the exposed dissociation of the micro-fine-grained gold being wrapped in pozzuolite compound, mine is eliminated in simultaneous oxidation
Organic carbon in stone；And the calcining after roasting adds water to size mixing cooling, and carries out leaching using environmental protection leaching gold reagent CG505 and mention
Golden operation, lean solution returns to leaching system after gold in leachate is recovered, and phase analysis is stored in Tailings Dam as general solid waste heap, roasts
Flue gas afterwards fully absorbs remaining arsenic oxide objectionable impurities in baking flue gas using the method for lye spray, realizes row up to standard
It puts.
Specific step is as follows:
Step 1, crushing operation
Combined using jaw crusher with gyratory crusher and be crushed, being crushed to gold ore granularity is that -40mm quality percentage contains
Amount 100%；
Step 2, dry milling operation
Different gold ores, the granularmetric composition and occurrence status due to gold are different, and dry milling granularmetric composition is not also identical,
The grinding fineness for controlling gold ore is being to obtain gold mine powder between 70%~95% less than -0.074mm mass percentage；
Step 3, low temperature oxygen-enriched air roasting operation
Maturing temperature target value, which is set, according to ore properties starts rotary roasting furnace temperature specifically between 300-550 DEG C
Control system is spent, heating device heating is controlled by temperature control system, by gold mine powder resulting after step 2 ore grinding by giving
Glassware is uniformly fed in rotary roaster, while starting the rotation system of furnace body, controls inflation system by temperature control system
It unites and is passed through air into furnace, inflation system and heating device are adjusted by temperature control system and roasted to control in roasting process
The stabilization of temperature realizes gold mine powder residence time in furnace by the adjustment at furnace body velocity of rotation and furnace body inclination angle, roasting
The flue gas of generation enters alkali liquor efficient spray system, qualified discharge after processing by smoke outlet, and calcining carries out next step operation；
Step 4, leaching mention Jin Zuoye
The calcining of step 3 is discharged into blended size system from furnace body end gape, size mixing to mass concentration be 25%~
50%, guarantee that slurry pH is 9~11, adds CG505 medicament, leaching 24-48h is separated by solid-liquid separation after leaching,
The phase analysis of output is emitted into Tailings Dam, recycles the gold in leachate, and the lean solution return after recycling gold, which continues to leach, mentions golden work
Industry.
Beneficial effects of the present invention:
The present invention efficiently solves traditional rotary kiln baking heating method using the combustion for spraying into hot gas or burning into kiln
Heating caused by material is heated is uneven, and temperature of charge fluctuates larger problem in kiln, effectively controls maturing temperature in 300-
It 550 DEG C and is evenly heated, vulcanizes arsenic mineral in oxygenolysis ore, make to wrap up the sufficiently exposed dissociation of micro-fine-grained gold therein, together
When oxidized ore in organic carbon, solve the problems, such as organic carbon adsorption " robbing gold ", most of nuisance arsenic by oxygen-rich oxide is arsenic
Enter in calcining after hydrochlorate, reduce subsequent flue gas environment environmental protection treatment pressure, calcining is carried out using environmental protection leaching gold reagent CG505
The leaching of gold mentions Jin Zuoye, and leaching velocity is fast, and gold recycling is simple and convenient, and leaching tailing can be used as general solid waste heap and be stored in Tailings Dam
In, safety and environmental protection；It recycles gold to greatest extent, and reduces the pollution to environment, make this part difficult-treating gold mine
Resource can be fully used.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Specific embodiment
The present invention roasts main equipment and uses rotary roaster, heating device is set on rotary roaster, and solid
It outside furnace body, is not rotated together with furnace body, which is to heat ring with the socket type of insulating layer and insulating layer, is added
Hot ring is heatable after being powered, and realizes and heats to rotary roaster furnace body, and furnace interior is equipped with temperature-detecting device and inflation system
System, inflation system can be filled at different flow rates air into furnace, temperature-detecting device, heating device and inflation system with temperature
Spend control system control connection；According to ore properties, maturing temperature target value is determined, temperature control system control heating device is opened
It opens, is heated, when temperature control system shows that in-furnace temperature exceeds target value, temperature control system controls inflation system and increases
Big aeration quantity, while reducing heating devices heat power or stopping heating；When temperature control system shows that in-furnace temperature is lower than mesh
When scale value, temperature control system controls inflation system and reduces aeration quantity, reduces the flow velocity of inflation, while increasing adding for heating device
Thermal power；So circulation realizes the heat dynamic equilibrium of roasting environment, guarantees oxygen-enriched state while low temperature, that is, 300-550 DEG C
Roasting environment, oxygen-enriched state needs the excess air of air capacity Yu specific coefficient of excess product through theory to be filled with into furnace
It realizes, and is rotated by furnace body and realize that material uniformly roasts, the pozzuolite compound in decomposing ore makes to be wrapped in pozzuolite compound
The organic carbon in ore is eliminated in the exposed dissociation of micro-fine-grained gold, simultaneous oxidation.
And the calcining after roasting adds water to size mixing cooling, and carries out leaching using environmental protection leaching gold reagent CG505 and mention golden work
Industry, lean solution returns to leaching system after gold in leachate is recovered, and phase analysis is stored in Tailings Dam as general solid waste heap, after roasting
Flue gas fully absorbs remaining arsenic oxide objectionable impurities in baking flue gas using the method for lye spray, realizes qualified discharge.
Embodiment 1
Step 1, crushing operation
Combined using jaw crusher with gyratory crusher and be crushed, being crushed to gold ore granularity is that -40mm quality percentage contains
Amount 100%；
Step 2, dry milling operation
Different gold ores, the granularmetric composition and occurrence status due to gold are different, and dry milling granularmetric composition is not also identical,
Broken gold ore is milled to by -0.074mm mass percentage 80% using vertical roll grinder, obtains gold mine powder；
Step 3, low temperature oxygen-enriched air roasting operation
Organic carbon content is 1.53% in the present embodiment ore, arsenic mass fraction is 0.5%, belongs to the low arsenic gold of high-carbon
Ore sets maturing temperature target value as 350 DEG C, and start-up temperature control system controls heating device by temperature control system
Until in-furnace temperature is 350 DEG C, the gold ore after dry grinding is fed by screw(-type) feeder to be had warmed up to 350 DEG C of rotary roastings for heating
It burns in furnace, opens furnace body rotation system and inflation system, when exceeding 350 DEG C in furnace, temperature control system controls inflation system
Increase aeration quantity, while reducing heating device power or stopping heating；When in-furnace temperature is lower than 350 DEG C, temperature control system
Controlling inflation system reduces aeration quantity, while increasing heating device power；Furnace body Inclination maneuver is 5 °, and furnace body revolving speed controls 3r/
Min, aeration quantity are averaged 50m3/ h inflates excess oxygen coefficient 2.2, controls ore residing time in furnace 1.5h；Arsenic oxygenation efficiency
91.35%, arsenic curing degree 90.77%, organic carbon oxygenation efficiency 99.32%；
It roasts the flue gas generated and alkali liquor efficient spray system, qualified discharge after processing is entered by smoke outlet, calcining carries out
It operates in next step；
Step 4, leaching mention Jin Zuoye
The calcining of step 3 is discharged into surge tank from furnace body end gape, sizing mixing to mass concentration is 40%, guarantees mine
Starching pH value is 10, adds CG505 medicament, and dosage is 1.8kg/t calcining, and leaching for 24 hours, carries out solid-liquid point after leaching
From the phase analysis of output is emitted into Tailings Dam, recycles the gold in leachate, and the lean solution return after recycling gold, which continues to leach, mentions gold
Operation；The leaching rate of gold is 89.41%, leaches tailing and reaches general solid waste standard.
Embodiment 2
Step 1, crushing operation
Combined using jaw crusher with gyratory crusher and be crushed, being crushed to gold ore granularity is that -40mm quality percentage contains
Amount 100%；
Step 2, dry milling operation
Different gold ores, the granularmetric composition and occurrence status due to gold are different, and dry milling granularmetric composition is not also identical,
It uses vertical roll grinder that broken gold ore is milled to fineness as -0.074mm mass percentage 90%, obtains gold mine powder；
Step 3, low temperature oxygen-enriched air roasting operation
Organic carbon content is 0.67% in the present embodiment ore, arsenic mass fraction is 3.44%, belongs to high arsenic low-carbon
Gold ore sets maturing temperature target value as 500 DEG C, and start-up temperature control system controls heating dress by temperature control system
Set heating until in-furnace temperature be 500 DEG C, the gold ore after dry grinding fed by screw(-type) feeder have warmed up to 500 DEG C it is rotary
In roaster, furnace body rotation system and inflation system are opened, when exceeding 500 DEG C in furnace, temperature control system control inflation system
System increases aeration quantity, while reducing heating device power or stopping heating；When in-furnace temperature is lower than 500 DEG C, temperature control system
System control inflation system reduces aeration quantity, while increasing heating device power；Furnace body Inclination maneuver is 3 °, the control of furnace body revolving speed
2.5r/min, aeration quantity are averaged 65m3/ h inflates excess oxygen coefficient 2.8, controls ore residing time in furnace 2.0h；Arsenic oxidation
Rate 96.67%, arsenic curing degree 88.36%, organic carbon oxygenation efficiency 99.76%；
It roasts the flue gas generated and alkali liquor efficient spray system, qualified discharge after processing is entered by smoke outlet, calcining carries out
It operates in next step；
Step 4, leaching mention Jin Zuoye
The calcining of step 3 is discharged into surge tank from furnace body end gape, sizing mixing to mass concentration is 33%, guarantees mine
Starching pH value is 10.5, adds CG505 medicament, and dosage is 3.0kg/t calcining, and leaching 36h carries out solid-liquid point after leaching
From the phase analysis of output is emitted into Tailings Dam, recycles the gold in leachate, and the lean solution return after recycling gold, which continues to leach, mentions gold
Operation；The leaching rate of gold is 91.33%, leaches tailing and reaches general solid waste standard.
Embodiment 3
Step 1, crushing operation
Combined using jaw crusher with gyratory crusher and be crushed, being crushed to gold ore granularity is that -40mm quality percentage contains
Amount 100%；
Step 2, dry milling operation
Different gold ores, the granularmetric composition and occurrence status due to gold are different, and dry milling granularmetric composition is not also identical,
It uses vertical roll grinder that broken gold ore is milled to fineness as -0.074mm mass percentage 70%, obtains gold mine powder；
Step 3, low temperature oxygen-enriched air roasting operation
Organic carbon content is 2.27% in the present embodiment ore, arsenic mass fraction is 1.69%, belongs to the high arsenic of high-carbon
Gold ore sets maturing temperature target value as 400 DEG C, and start-up temperature control system controls heating dress by temperature control system
Set heating until in-furnace temperature be 400 DEG C, the gold ore after dry grinding fed by screw(-type) feeder have warmed up to 400 DEG C it is rotary
In roaster, furnace body rotation system and inflation system are opened, when exceeding 400 DEG C in furnace, temperature control system control inflation system
System increases aeration quantity, while reducing heating device power or stopping heating；When in-furnace temperature is lower than 400 DEG C, temperature control system
System control inflation system reduces aeration quantity, while increasing heating device power；Furnace body Inclination maneuver is 4 °, the control of furnace body revolving speed
4.5r/min, aeration quantity are averaged 58m3/ h inflates excess oxygen coefficient 2.5, controls ore residing time in furnace 1.0h.Arsenic oxidation
Rate 94.57%, arsenic curing degree 83.49%, organic carbon oxygenation efficiency 99.05%；
It roasts the flue gas generated and alkali liquor efficient spray system, qualified discharge after processing is entered by smoke outlet, calcining carries out
It operates in next step；
Step 4, leaching mention Jin Zuoye
The calcining of step 3 is discharged into surge tank from furnace body end gape, sizing mixing to mass concentration is 45%, guarantees mine
Starching pH value is 9.5, adds CG505 medicament, and dosage is 1.2kg/t calcining, and leaching for 24 hours, carries out solid-liquid point after leaching
From the phase analysis of output is emitted into Tailings Dam, recycles the gold in leachate, and the lean solution return after recycling gold, which continues to leach, mentions gold
Operation；The leaching rate of gold is 95.02%, leaches tailing and reaches general solid waste standard.
Embodiment 4
Step 1, crushing operation
Combined using jaw crusher with gyratory crusher and be crushed, being crushed to gold ore granularity is that -40mm quality percentage contains
Amount 100%；
Step 2, dry milling operation
Different gold ores, the granularmetric composition and occurrence status due to gold are different, and dry milling granularmetric composition is not also identical,
It uses vertical roll grinder that broken gold ore is milled to fineness as -0.074mm mass percentage 75%, obtains gold mine powder；
Step 3, low temperature oxygen-enriched air roasting operation
Organic carbon content is 1.96% in the present embodiment ore, arsenic mass fraction is 2.18%, belongs to the high arsenic of high-carbon
Gold ore sets maturing temperature target value as 450 DEG C, and start-up temperature control system controls heating dress by temperature control system
Set heating until in-furnace temperature be 450 DEG C, the gold ore after dry grinding fed by screw(-type) feeder have warmed up to 450 DEG C it is rotary
In roaster, furnace body rotation system and inflation system are opened, when exceeding 450 DEG C in furnace, temperature control system control inflation system
System increases aeration quantity, while reducing heating device power or stopping heating；When in-furnace temperature is lower than 450 DEG C, temperature control system
System control inflation system reduces aeration quantity, while increasing heating device power；Furnace body Inclination maneuver is 3 °, the control of furnace body revolving speed
5r/min, aeration quantity are averaged 70m3/ h inflates excess oxygen coefficient 3.5, controls ore residing time in furnace 1.5h.Arsenic oxygenation efficiency
97.96%, arsenic curing degree 85.33%, organic carbon oxygenation efficiency 99.67%；
It roasts the flue gas generated and alkali liquor efficient spray system, qualified discharge after processing is entered by smoke outlet, calcining carries out
It operates in next step；
Step 4, leaching mention Jin Zuoye
The calcining of step 3 is discharged into surge tank from furnace body end gape, sizing mixing to mass concentration is 40%, guarantees mine
Starching pH value is 10, adds CG505 medicament, and dosage is 0.8kg/t calcining, and leaching for 24 hours, carries out solid-liquid point after leaching
From the phase analysis of output is emitted into Tailings Dam, recycles the gold in leachate, and the lean solution return after recycling gold, which continues to leach, mentions gold
Operation；The leaching rate of gold is 93.67%, leaches tailing and reaches general solid waste standard.
Embodiment 5
Step 1, crushing operation
Combined using jaw crusher with gyratory crusher and be crushed, being crushed to gold ore granularity is that -40mm quality percentage contains
Amount 100%；
Step 2, dry milling operation
Different gold ores, the granularmetric composition and occurrence status due to gold are different, and dry milling granularmetric composition is not also identical,
It uses vertical roll grinder that broken gold ore is milled to fineness as -0.074mm mass percentage 90%, obtains gold mine powder；
Step 3, low temperature oxygen-enriched air roasting operation
Organic carbon content is 1.89% in the present embodiment ore, arsenic mass fraction is 0.36%, belongs to the low arsenic of high-carbon
Gold ore sets maturing temperature target value as 350 DEG C, and start-up temperature control system controls heating dress by temperature control system
Set heating until in-furnace temperature be 350 DEG C, the gold ore after dry grinding fed by screw(-type) feeder have warmed up to 350 DEG C it is rotary
In roaster, furnace body rotation system and inflation system are opened, when exceeding 350 DEG C in furnace, temperature control system control inflation system
System increases aeration quantity, while reducing heating device power or stopping heating；When in-furnace temperature is lower than 350 DEG C, temperature control system
System control inflation system reduces aeration quantity, while increasing heating device power；Furnace body Inclination maneuver is 3 °, the control of furnace body revolving speed
4r/min, aeration quantity are averaged 40m3/ h inflates excess oxygen coefficient 2.0, controls ore residing time in furnace 2.0h.Arsenic oxygenation efficiency
88.64%, arsenic curing degree 79.25%, organic carbon oxygenation efficiency 97.82%；
It roasts the flue gas generated and alkali liquor efficient spray system, qualified discharge after processing is entered by smoke outlet, calcining carries out
It operates in next step；
Step 4, leaching mention Jin Zuoye
The calcining of step 3 is discharged into surge tank from furnace body end gape, sizing mixing to mass concentration is 40%, guarantees mine
Starching pH value is 11, adds CG505 medicament, and dosage is 1.6kg/t calcining, and leaching 48h carries out solid-liquid point after leaching
From the phase analysis of output is emitted into Tailings Dam, recycles the gold in leachate, and the lean solution return after recycling gold, which continues to leach, mentions gold
Operation；The leaching rate of gold is 88.72%, leaches tailing and reaches general solid waste standard.
Embodiment 6
Step 1, crushing operation
Combined using jaw crusher with gyratory crusher and be crushed, being crushed to gold ore granularity is that -40mm quality percentage contains
Amount 100%；
Step 2, dry milling operation
Different gold ores, the granularmetric composition and occurrence status due to gold are different, and dry milling granularmetric composition is not also identical,
It uses vertical roll grinder that broken gold ore is milled to fineness as -0.074mm mass percentage 85%, obtains gold mine powder；
Step 3, low temperature oxygen-enriched air roasting operation
Organic carbon content is 2.66% in the present embodiment ore, arsenic mass fraction is 0.65%, belongs to the low arsenic of high-carbon
Gold ore sets maturing temperature target value as 380 DEG C, and start-up temperature control system controls heating dress by temperature control system
Set heating until in-furnace temperature be 380 DEG C, the gold ore after dry grinding fed by screw(-type) feeder have warmed up to 380 DEG C it is rotary
In roaster, furnace body rotation system and inflation system are opened, when exceeding 380 DEG C in furnace, temperature control system control inflation system
System increases aeration quantity, while reducing heating device power or stopping heating；When in-furnace temperature is lower than 380 DEG C, temperature control system
System control inflation system reduces aeration quantity, while increasing heating device power；Furnace body Inclination maneuver is 4 °, the control of furnace body revolving speed
3.5r/min, aeration quantity are averaged 60m3/ h inflates excess oxygen coefficient 3.3, controls ore residing time in furnace 1.5h.Arsenic oxidation
Rate 90.73%, arsenic curing degree 81.06%, organic carbon oxygenation efficiency 98.58%；
It roasts the flue gas generated and alkali liquor efficient spray system, qualified discharge after processing is entered by smoke outlet, calcining carries out
It operates in next step；
Step 4, leaching mention Jin Zuoye
The calcining of step 3 is discharged into surge tank from furnace body end gape, sizing mixing to mass concentration is 40%, guarantees mine
Starching pH value is 9, adds CG505 medicament, and dosage is 2.4kg/t calcining, and leaching 36h is separated by solid-liquid separation after leaching,
The phase analysis of output is emitted into Tailings Dam, recycles the gold in leachate, and the lean solution return after recycling gold, which continues to leach, mentions golden work
Industry；The leaching rate of gold is 94.96%, leaches tailing and reaches general solid waste standard.
Environmental protection leaching gold reagent CG505 can substitute calcining leach mention Jin Zuoye, because of its low toxicity characteristic,
Keeping and using simple compared with cyanide, can be realized under same amount with the comparable leaching gold effect of cyanide, and the examination
Phase analysis after agent leaching gold can reach general solid waste standard, for the of less demanding of stockpiling Tailings Dam.
Environmental protection leaching gold reagent CG505 behavioral illustrations:
(1) agent formulations: environmental protection leaching gold reagent CG505 is that one kind as made of a variety of nontoxic chemical reagent high temperature fusions is multiple
Leaching gold reagent is closed, a variety of effective components that can soak gold, including polymerization cyanamide, alkaline thiourea, leaching of these ingredients in gold are included
Main function is played during out.
(2) it soaks golden mechanism: respectively soaking golden effective component in alkaline (pH value 9-11) ore pulp system, in CG505 in dissolved oxygen
Synergistic effect under gold in oxidation complexation ore, so that golden quickly dissolution is entered solution, golden complex ion can by active carbon or
The recycling of resin efficient absorption also can recycle gold therein by ion-exchange or metal replacement method.
(3) environmental protection characteristic: each chemical reagent for synthesizing CG505 is nontoxic chemical reagent, CG505 and NaCN reagent toxicity
Identification of indicator it was found that, NaCN is to mouse median lethal dose up to 128mg/kg, and CG505 is only to mouse median lethal dose
5.88mg/kg illustrates that CG505 toxicity is extremely low, can significantly reduce the environmental protection pressure of gold-leaching technology, and leaching tailing being capable of conduct
General solid waste stockpiling requires the security level of construction Tailings Dam lower.
Claims (1)
1. a kind of carbon containing, arsenic refractory gold ore low temperature oxygen-enriched air roasting pre-processes-leach extraction of gold process, it is characterised in that roasting
Main equipment use rotary roaster, heating device is set on rotary roaster, and be fixed on outside furnace body, not with furnace
Body rotates together, which is that ring is heated with the socket type of insulating layer and insulating layer, and heating ring is heatable after being powered, real
It is now heated to rotary roaster furnace body, furnace interior is equipped with temperature-detecting device and inflation system, and inflation system can be into furnace
It is filled with air at different flow rates, temperature-detecting device, heating device and inflation system are controlled with temperature control system and connected；
According to ore properties, determine that maturing temperature target value, temperature control system control heating device and open, heated, when in furnace
When temperature exceeds target value, temperature control system controls inflation system and increases aeration quantity, while reducing heating devices heat power
Or stop heating；When in-furnace temperature is lower than target value, temperature control system controls inflation system and reduces aeration quantity, reduces inflation
Flow velocity, while increasing the heating power of heating device；So circulation realizes the heat dynamic equilibrium of roasting environment, guarantees low
The roasting environment of oxygen-enriched state while i.e. 300-550 DEG C of temperature, and rotated by furnace body and realize that material uniformly roasts, decomposing ore
In pozzuolite compound, and the calcining after roasting adds water to size mixing cooling, and carries out leaching using environmental protection leaching gold reagent CG505 and mention
Golden operation, lean solution returns to leaching system after gold in leachate is recovered, and phase analysis is stored in Tailings Dam as general solid waste heap, roasts
Flue gas afterwards absorbs remaining arsenic oxide objectionable impurities in baking flue gas using the method for lye spray, realizes qualified discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811618427.2A CN109706310B (en) | 2018-12-28 | 2018-12-28 | Low-temperature oxygen-enriched roasting pretreatment-leaching gold extraction process for carbon and arsenic-containing refractory gold ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811618427.2A CN109706310B (en) | 2018-12-28 | 2018-12-28 | Low-temperature oxygen-enriched roasting pretreatment-leaching gold extraction process for carbon and arsenic-containing refractory gold ore |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109706310A true CN109706310A (en) | 2019-05-03 |
| CN109706310B CN109706310B (en) | 2020-08-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110331277A (en) * | 2019-07-02 | 2019-10-15 | 长春黄金研究院有限公司 | A method of oxidation carries golden sulfide mineral |
| CN114231738A (en) * | 2021-11-09 | 2022-03-25 | 长春黄金研究院有限公司 | Combined method for dressing and smelting polysulfide micro-fine particle dyeing type gold-bearing ore |
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| CN102818449B (en) * | 2012-09-13 | 2014-05-21 | 伍耀明 | Vacuum rotary kiln and application process thereof |
| CN103122415B (en) * | 2013-03-13 | 2014-05-28 | 山东乾舜矿冶科技股份有限公司 | Method for improving inclusion gold leaching rate |
| US9920395B2 (en) * | 2014-09-24 | 2018-03-20 | Ecolab Usa Inc. | Method for recovering gold from refractory ore |
| CN107385198B (en) * | 2017-07-11 | 2019-02-22 | 唐丽娜 | A kind of method of roasting using rotary kiln baking oxidation refractory aurin miberal powder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110331277A (en) * | 2019-07-02 | 2019-10-15 | 长春黄金研究院有限公司 | A method of oxidation carries golden sulfide mineral |
| CN114231738A (en) * | 2021-11-09 | 2022-03-25 | 长春黄金研究院有限公司 | Combined method for dressing and smelting polysulfide micro-fine particle dyeing type gold-bearing ore |
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