CN211689180U - Gold extraction device by microwave rotary hearth furnace chlorination - Google Patents
Gold extraction device by microwave rotary hearth furnace chlorination Download PDFInfo
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- CN211689180U CN211689180U CN202020219415.9U CN202020219415U CN211689180U CN 211689180 U CN211689180 U CN 211689180U CN 202020219415 U CN202020219415 U CN 202020219415U CN 211689180 U CN211689180 U CN 211689180U
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Abstract
The utility model provides a gold extraction device by chlorination in a microwave rotary hearth furnace, which comprises a feeding unit, a rotary hearth furnace body, a microwave unit, a transmission unit and a discharging unit; the rotary hearth furnace body comprises an upper fixed furnace body and a lower rotary hearth, the rotary hearth furnace body is sequentially divided into a feeding area, a reaction area and a discharging area along the rotation direction of the hearth, the upper surface of the rotary hearth is provided with an electric heating plate, and the furnace top is provided with an exhaust port; the microwave unit is arranged on the top of the rotary hearth furnace, and the transmission unit is arranged on the lower part of the rotary hearth furnace and connected with the bottom of the rotary hearth furnace. The device of the utility model is a rotary hearth furnace for extracting valuable metals such as gold, adopts a mode of combining microwave heating and electric heating, has fast heating rate, even heating, high thermal efficiency and low smoke rate; the device can directly process powdery materials, reduces the processes of granulating and drying materials, shortens the process flow, reduces the energy consumption and the cost and is beneficial to improving the economic benefit and the environmental benefit compared with a rotary kiln of conventional equipment.
Description
Technical Field
The utility model belongs to the technical field of metal smelting, a microwave rotary hearth furnace chlorination gold extraction device is related to.
Background
The metal smelting refers to a process of extracting metals existing in the form of compounds in minerals and converting the metals into free states, and mainly comprises hydrometallurgy, pyrometallurgy and the like. Gold is used as a precious metal simple substance, is usually extracted by adopting a gold chloride extraction mode, and under the conditions of high temperature and the existence of a chlorinating agent, gold in a gold-containing material is separated from the material in the form of chloride gas, and then is recovered from flue gas.
At present, a rotary kiln with wide material adaptability is generally adopted as chlorination volatilization reaction equipment in a high-temperature chlorination gold extraction process, but the smoke dust rate of the rotary kiln is often high, and the recovery of gold chloride in flue gas and the treatment process of the flue gas are relatively complex, for example, CN 108568204a discloses a washing and recovering process of high-temperature flue gas in the chlorination gold extraction process, the flue gas needs to be settled by gravity, sprayed in a two-stage U-shaped hollow tower for cooling and dust removal, and then passes through a turbulent ball tower, an electric demister, a fan, a desulfurizing tower and the like, solid-containing liquid obtained by spraying and cooling is sent into a deep cone for precipitation, and the treatment process is relatively complex, the required energy consumption is relatively high, and the heat utilization.
In order to avoid the problem of high smoke dust rate of the rotary kiln, materials and chloride are mixed, granulated and dried and then enter the rotary kiln for chlorination reaction, but the whole process flow is long, the failure rate is high, and the defects of high air leakage rate, low heat utilization rate and the like of the rotary kiln are overcome, so that the overall process energy consumption is high, the environmental protection effect is poor, the investment cost and the operation cost are high, and the further popularization of the high-temperature chlorination volatilization gold extraction technology is influenced, so that the equipment of the chlorination gold extraction technology is necessary to be adjusted and changed.
The rotary hearth furnace is a high-temperature furnace with a fixed upper furnace body and a rotatable bottom, is mainly used for treating carbon-containing pellets or iron ore powder in a direct iron reduction process in the steel industry at present, and generally uses natural gas, fuel oil or pulverized coal as fuel for heating. CN 207610534U discloses a rotary hearth furnace, including annular furnace body, hearth and feeding portion, the furnace body is internal to inject the furnace chamber, inject feeding zone, preheating zone, reduction zone and the ejection of compact district that communicates each other in the furnace chamber, the hearth is established in the furnace chamber, the hearth is used for bearing the weight of the material and flows through above-mentioned region in proper order, ejection of compact district part is equipped with feeding portion, adds the antioxidant to the ejection of compact district and prevents metal pellet reoxidation, but still can produce dust or a large amount of flue gas when the fuel that the device selected burns, influences the recovery of product and the improvement of purity to the material is prefabricated into the pellet form earlier, has increased process flow.
In summary, for the extraction of the precious metal material, an appropriate device type needs to be selected according to the characteristics of the material, and the device is adaptively improved, so that the efficiency of the extraction process is improved, and the cost is reduced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to the problem that prior art exists, the utility model is to provide a gold device is carried in microwave rotary hearth furnace chlorination, the device is used for the extraction of valuable metals such as gold with the rotary hearth furnace to adopt the mode that microwave and electrical heating combined together, compare with traditional rotary kiln, heating rate is fast and the heating is even, has improved the thermal efficiency, has effectively reduced the dust rate, has shortened process flow simultaneously, reduces the energy consumption, improves economy and environmental benefit.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a gold extraction device by chlorination in a microwave rotary hearth furnace, which comprises a feeding unit, a rotary hearth furnace body, a microwave unit, a transmission unit and a discharging unit;
the rotary hearth furnace body comprises an upper fixed furnace body and a lower rotary hearth, the rotary hearth furnace body is sequentially divided into a feeding area, a reaction area and a discharging area along the rotation direction of the hearth, the upper surface of the rotary hearth is provided with an electric heating plate, and the top of the rotary hearth furnace body is provided with an exhaust port;
the feeding unit is connected to a feeding area of the rotary hearth furnace body, the microwave unit is arranged on the top of the rotary hearth furnace, the transmission unit is arranged on the lower portion of the rotary hearth furnace and connected with the bottom of the rotary hearth furnace, and the discharging unit is arranged in a discharging area of the rotary hearth furnace body.
The utility model discloses in, adopt the rotary hearth furnace to chloridize and carry out gold extraction, compare in traditional rotary kiln equipment, the rotary hearth furnace further adopts the mode that microwave heating and electrical heating combined together, has the fast and even characteristics of rate of heating, and the thermal efficiency is high, has overcome the defect of rotary kiln chlorination volatilization technique, shortens process flow, and very big reduction smoke and dust rate improves the heat utilization efficiency, reduces energy consumption, investment and manufacturing cost, has higher economic benefits and environmental benefit.
Specifically, the main equipment of the device is a rotary hearth furnace body, a microwave unit is used as a heating source, an electric heating plate arranged in the rotary hearth furnace is combined, and a transmission unit is used as the driving force for the rotation of the rotary hearth furnace, so that the precious metal extraction and material separation of the materials are completed in the moving process of the materials, the reaction rate is accelerated, and the reaction process flow is simplified.
Following conduct the utility model discloses preferred technical scheme, nevertheless do not conduct the utility model provides a technical scheme's restriction, through following technical scheme, can reach and realize better the utility model discloses a technical purpose and beneficial effect.
As the preferred technical proposal of the utility model, the rotary hearth furnace is annular, and the upper annular furnace body and the rotary hearth furnace bottom form the space in the closed furnace.
Preferably, the feed zone, the reaction zone and the discharge zone are separated by a longitudinal partition, the lower end of which is spaced from the surface of the rotary hearth.
Preferably, the distance between the lower end of the longitudinal partition and the upper surface of the rotary hearth is 30 to 200mm, for example, 30mm, 50mm, 80mm, 100mm, 120mm, 150mm, 180mm, or 200mm, but is not limited to the values listed, and other values not listed in the range of the values are also applicable.
The utility model discloses in, the main region of rotary hearth furnace body is divided by the baffle, and the material is along with the rotation of rotatory stove bottom and move, and the material motion can be guaranteed to longitudinal baffle lower extreme apart from rotatory stove bottom certain distance, can adjust the thickness on reaction zone material layer again, is convenient for fully react.
Preferably, the central angle of the annular furnace body corresponding to the feeding zone is 10 to 30 degrees, such as 10 degrees, 15 degrees, 20 degrees, 25 degrees or 30 degrees, but not limited to the values listed, and other values not listed in the range of the values are also applicable.
Preferably, the central angle of the annular furnace body corresponding to the reaction zone is 270-330 degrees, such as 270 degrees, 280 degrees, 290 degrees, 300 degrees, 310 degrees, 320 degrees, 240 degrees, 270 degrees or 330 degrees, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the central angle of the annular furnace body corresponding to the discharge area is 10 to 30 degrees, such as 10 degrees, 15 degrees, 20 degrees, 25 degrees or 30 degrees, but not limited to the recited values, and other values not recited in the range of the values are also applicable.
The utility model discloses in, the regional division of rotary hearth furnace body is relevant with factors such as component position in reactant kind and handling capacity, reaction condition and the device, and regional size separately can suitably be adjusted.
As the preferred technical scheme of the utility model, rotatory stove bottom top-down includes electrical heating board, heat-resisting heat preservation and stove bottom structure layer in proper order.
Preferably, the electrical heating plate comprises a ceramic electrical heating plate.
The utility model discloses in, the superiors at rotatory stove bottom are the electric heating layer, with material direct contact heating, and in order to avoid thermal scattering and disappearing, the electric heating layer below sets up the heat preservation, is built by refractory material, and the furnace bottom structure layer of direct and outside and drive unit contact is promptly to the lower floor, needs have sufficient intensity.
Preferably, the exhaust port is arranged on the furnace top corresponding to the reaction zone close to one side of the feeding zone.
The utility model discloses in, the gas vent sets up in the nearer position apart from the feeding zone, and the material just begins to react here, and the temperature is lower relatively, and when the gaseous result that volatilizees that the reaction zone produced flowed to the gas vent in addition, formed the convection current with solid-state material, played the effect of heat transfer, reduced the gaseous temperature of export on the one hand, had the waste heat effect to the material on the one hand to the increasing of heat efficiency.
As the utility model discloses preferred technical scheme, the feed unit includes measurement conveyor and distributing device, distributing device's export extends to in the feed zone of rotary hearth furnace body.
Preferably, the microwave unit comprises at least one microwave generating device, for example, 1, 10, 30, 50, 75 or 100, and the like, and the specific number is selected according to the size of the rotary hearth furnace and the material handling capacity, and is uniformly distributed on the furnace top corresponding to the reaction zone of the rotary hearth furnace body, so as to maintain uniform heating of the materials in the reaction zone and facilitate sufficient reaction of the materials.
Preferably, the discharging unit comprises a loosening screw and a scraping screw in sequence along the rotation direction of the furnace bottom, the loosening screw and the scraping screw are both arranged along the radial direction of the annular furnace body, the loosening screw can depolymerize and break up partially sintered materials, and the materials are discharged by the scraping screw.
Preferably, the tail end of the discharge unit is provided with a discharge opening, and the discharge opening is connected with a discharge chute.
As the utility model discloses preferred technical scheme, the drive unit includes backing roll, centring roller and drive arrangement, the backing roll equipartition is in the below of the rotatory stove bottom of annular, and the contact of rotatory stove bottom, the centring roller equipartition is on rotatory stove bottom inner ring lateral wall, outwards withstands the stove bottom on the inner ring circumference, drive arrangement sets up in the below of rotatory stove bottom, passes through gear connection with rotatory stove bottom.
In the utility model, a plurality of supporting rolls are arranged below the bottom of the rotary hearth furnace and used for supporting the bottom structure layer, and the annular furnace bottom performs circular motion on the supporting rolls; a plurality of centering rollers outwards prop against the furnace bottom on the horizontal circumferential plane of the inner ring, so that the furnace bottom rotates around the fixed center; the driving devices are uniformly distributed at the bottom of the rotary hearth furnace and drive the rotary hearth furnace to do circular motion on the supporting roll.
Preferably, the driving device is an electric motor, and a speed reducer is usually further arranged for facilitating the control of the rotation speed of the rotary hearth furnace.
As the preferred technical scheme of the utility model, the device still includes the exhaust unit, the exhaust unit links to each other with the gas vent of rotary hearth furnace.
Preferably, the exhaust unit comprises an induced draft fan, and an inlet of the induced draft fan is connected with an exhaust port of the rotary hearth furnace.
The utility model discloses in, rotary hearth furnace roof exhaust port department sets up the blast pipe, links to each other with the draught fan, maintains the little negative pressure of blast pipe department through the suction of draught fan, and the gas in the furnace body of being convenient for is in time taken out.
The utility model also provides a method for adopt above-mentioned device to carry out chlorination and carry out gold extraction, the method includes:
after entering the rotary hearth furnace, the mixed material containing the gold material and the chlorinating agent moves along with the rotary hearth furnace, the mixed material is subjected to chlorination volatilization reaction under the action of electric heating and microwaves, gaseous volatile matters leave from the top, and solid materials after the reaction are discharged out of the rotary hearth furnace.
As a preferred technical solution of the present invention, the gold-containing material includes any one or a combination of at least two of cyanidation tailings, gold-containing minerals or gold-containing mineral roasting residues, and typical but non-limiting examples of the combination are: the combination of cyanidation tailings and gold-containing minerals, the combination of gold-containing minerals and gold-containing mineral roasting residues, the combination of cyanidation tailings, gold-containing minerals and gold-containing mineral roasting residues and the like.
Preferably, the chlorinating agent comprises calcium chloride and/or sodium chloride.
Preferably, the chlorinating agent is added in an amount of 3 to 10 wt% of the gold-containing material, such as 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt% or 10 wt%, but not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the thickness of the material layer after the mixed material enters the reaction zone is 30 to 200mm, such as 30mm, 50mm, 80mm, 100mm, 120mm, 150mm, 180mm or 200mm, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
In a preferred embodiment of the present invention, the rate of rotation of the rotary hearth is 1 to 5 °/min, for example, 1 °/min, 1.5 °/min, 2 °/min, 2.5 °/min, 3 °/min, 3.5 °/min, 4 °/min, 4.5 °/min, or 5 °/min, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range of values are also applicable.
The utility model discloses in, according to factors such as the kind and the reaction temperature of the material that contains gold, determined the required reaction time of material, the rotation rate of rotary hearth furnace has then been confirmed to the time of chlorination reaction.
Preferably, the reaction temperature is 950 to 1200 ℃, for example 950 ℃, 1000 ℃, 1050 ℃, 1100 ℃, 1150 ℃ or 1200 ℃, but not limited to the values listed, and other values not listed within this range are also applicable.
As the preferable technical proposal of the utility model, the valuable metals in the volatile substances are recovered after the volatile substances in the gas state are discharged.
Preferably, the solid material after reaction is discharged after being scattered by loose materials.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the device of the utility model uses the rotary hearth furnace for extracting valuable metals, adopts microwave heating and electric heating modes, has fast heating rate, uniform heating, high thermal efficiency which can reach more than 95 percent, and reduces the smoke dust rate to below 5 percent;
(2) the rotary kiln is compared to the device, has reduced pelletization, the drying process of material, shortens process flow, reduces energy consumption, investment and manufacturing cost, helps promoting economic benefits and environmental benefit.
Drawings
FIG. 1 is a top view of a gold chloride extraction device of a microwave rotary hearth furnace provided in embodiment 1 of the present invention;
FIG. 2 is a side view of a gold chloride extraction apparatus of a microwave rotary hearth furnace according to embodiment 1 of the present invention;
the device comprises 1-1-a metering conveying device, 1-2-a distributing device, 2-1-an upper fixed furnace body, 2-2-a rotary furnace bottom, 2-3-a heat-resistant insulating layer, 2-4-a furnace bottom structural layer, 2-5-an electric heating plate, 2-6-a longitudinal partition plate, 3-1-a supporting roller, 3-2-a driving device, 3-3-a centering roller, 4-a microwave generating device, 5-1-a loose material spiral, 5-2-a scraping material spiral, 5-3-a discharging chute and 6-an exhaust port.
Detailed Description
To better explain the utility model, the technical proposal of the utility model is convenient to understand, and the utility model is further explained in detail below. However, the following embodiments are only simple examples of the present invention, and do not represent or limit the scope of the present invention, which is defined by the appended claims.
The utility model provides a gold extraction device by chlorination in a microwave rotary hearth furnace, which comprises a feeding unit, a rotary hearth furnace body, a microwave unit, a transmission unit and a discharging unit;
the rotary hearth furnace body comprises an upper fixed furnace body 2-1 and a lower rotary hearth 2-2, the rotary hearth furnace body is sequentially divided into a feeding area, a reaction area and a discharging area along the rotation direction of the hearth, the upper surface of the rotary hearth 2-2 is provided with an electric heating plate 2-5, and the top of the rotary hearth furnace body is provided with an exhaust port 6;
the feeding unit is connected to a feeding area of the rotary hearth furnace body, the microwave unit is arranged on the top of the rotary hearth furnace, the transmission unit is arranged on the lower portion of the rotary hearth 2-2 and connected with the rotary hearth 2-2, and the discharging unit is arranged in a discharging area of the rotary hearth furnace body.
The following are typical but non-limiting examples of the present invention:
example 1:
the embodiment provides a gold chloride extraction device of a microwave rotary hearth furnace, wherein the top view of the device is shown in figure 1, the side expanded view of the device is shown in figure 2, and the device comprises a feeding unit, a rotary hearth furnace body, a microwave unit, a transmission unit and a discharging unit;
the rotary hearth furnace body comprises an upper fixed furnace body 2-1 and a lower rotary hearth 2-2, the rotary hearth furnace body is sequentially divided into a feeding area, a reaction area and a discharging area along the rotation direction of the hearth, the upper surface of the rotary hearth 2-2 is provided with an electric heating plate 2-5, and the top of the rotary hearth furnace body is provided with an exhaust port 6;
the feeding unit is connected to a feeding area of the rotary hearth furnace body, the microwave unit is arranged on the top of the rotary hearth furnace, the transmission unit is arranged on the lower portion of the rotary hearth 2-2 and connected with the rotary hearth 2-2, and the discharging unit is arranged in a discharging area of the rotary hearth furnace body.
The rotary hearth furnace is annular, and an upper annular furnace body and the rotary hearth 2-2 form a space in the closed furnace.
The feeding area and the reaction area, and the reaction area and the discharging area are separated by a longitudinal clapboard 2-6, and the distance between the lower end of the longitudinal clapboard 2-6 and the upper surface of the rotary furnace bottom 2-2 is 160 mm.
The central angle of the annular furnace body corresponding to the feeding area is 20 degrees, the central angle of the annular furnace body corresponding to the reaction area is 310 degrees, and the central angle of the annular furnace body corresponding to the discharging area is 30 degrees.
The rotary furnace bottom 2-2 sequentially comprises an electric heating plate 2-5, a heat-resistant insulating layer 2-3 and a furnace bottom structure layer 2-4 from top to bottom, and the electric heating plate 2-5 is a ceramic electric heating plate.
The exhaust port 6 is arranged on the furnace top corresponding to the reaction zone close to one side of the feeding zone.
The feeding unit comprises a metering conveying device 1-1 and a distributing device 1-2, and an outlet of the distributing device 1-2 extends into a feeding area of the rotary hearth furnace body.
The microwave unit comprises 100 microwave generating devices 4 which are uniformly distributed on the furnace top corresponding to the reaction zone of the rotary hearth furnace body.
The discharging unit sequentially comprises a loosening spiral 5-1 and a scraping spiral 5-2 along the rotation direction of the furnace bottom, and the loosening spiral 5-1 and the scraping spiral 5-2 are both arranged along the radial direction of the annular furnace body; the tail end of the discharging unit is provided with a discharging opening, and the discharging opening is connected with a discharging chute 5-3.
The transmission unit comprises a supporting roll 3-1, centering rolls 3-3 and a driving device 3-2, wherein the supporting roll 3-1 is uniformly distributed below the annular rotary furnace bottom 2-2 and is contacted with the rotary furnace bottom 2-2, the centering rolls 3-3 are uniformly distributed on the side wall of an inner ring of the rotary furnace bottom 2-2 and outwards prop against the furnace bottom on the circumference of the inner ring, and the driving device 3-2 is arranged below the rotary furnace bottom 2-2 and is connected with the rotary furnace bottom 2-2; the driving device 3-2 is an electric motor.
The device still includes the exhaust unit, the exhaust unit includes the draught fan, the entry of draught fan links to each other with the gas vent 6 of rotary hearth furnace.
Example 2:
the embodiment provides a gold chloride extraction device of a microwave rotary hearth furnace, which comprises a feeding unit, a rotary hearth furnace body, a microwave unit, a transmission unit and a discharging unit;
the rotary hearth furnace body comprises an upper fixed furnace body 2-1 and a lower rotary hearth 2-2, the rotary hearth furnace body is sequentially divided into a feeding area, a reaction area and a discharging area along the rotation direction of the hearth, the upper surface of the rotary hearth 2-2 is provided with an electric heating plate 2-5, and the top of the rotary hearth furnace body is provided with an exhaust port 6;
the feeding unit is connected to a feeding area of the rotary hearth furnace body, the microwave unit is arranged on the top of the rotary hearth furnace, the transmission unit is arranged on the lower portion of the rotary hearth 2-2 and connected with the rotary hearth 2-2, and the discharging unit is arranged in a discharging area of the rotary hearth furnace body.
The rotary hearth furnace is annular, and an upper annular furnace body and the rotary hearth 2-2 form a space in the closed furnace.
The feeding zone and the reaction zone, and the reaction zone and the discharge zone are separated by a longitudinal clapboard 2-6, and the distance between the lower end of the longitudinal clapboard 2-6 and the upper surface of the rotary furnace bottom 2-2 is 50 mm.
The central angle of the annular furnace body corresponding to the feeding area is 10 degrees, the central angle of the annular furnace body corresponding to the reaction area is 330 degrees, and the central angle of the annular furnace body corresponding to the discharging area is 20 degrees.
The rotary furnace bottom 2-2 sequentially comprises an electric heating plate 2-5, a heat-resistant insulating layer 2-3 and a furnace bottom structure layer 2-4 from top to bottom, and the electric heating plate 2-5 is a ceramic electric heating plate.
The exhaust port 6 is arranged on the furnace top corresponding to the reaction zone close to one side of the feeding zone.
The feeding unit comprises a metering conveying device 1-1 and a distributing device 1-2, and an outlet of the distributing device 1-2 extends into a feeding area of the rotary hearth furnace body.
The microwave unit comprises 50 microwave generating devices 4 which are uniformly distributed on the furnace top corresponding to the reaction zone of the rotary hearth furnace body.
The discharging unit sequentially comprises a loosening spiral 5-1 and a scraping spiral 5-2 along the rotation direction of the furnace bottom, and the loosening spiral 5-1 and the scraping spiral 5-2 are both arranged along the radial direction of the annular furnace body; the tail end of the discharging unit is provided with a discharging opening, and the discharging opening is connected with a discharging chute 5-3.
The transmission unit comprises a supporting roll 3-1, centering rolls 3-3 and a driving device 3-2, wherein the supporting roll 3-1 is uniformly distributed below the annular rotary furnace bottom 2-2 and is contacted with the rotary furnace bottom 2-2, the centering rolls 3-3 are uniformly distributed on the side wall of an inner ring of the rotary furnace bottom 2-2 and outwards prop against the furnace bottom on the circumference of the inner ring, and the driving device 3-2 is arranged below the rotary furnace bottom 2-2 and is connected with the rotary furnace bottom 2-2; the driving device 3-2 is a motor and a speed reducer.
The device still includes the exhaust unit, the exhaust unit includes the draught fan, the entry of draught fan links to each other with the gas vent 6 of rotary hearth furnace.
Example 3:
the embodiment provides a gold chloride extraction method of a microwave rotary hearth furnace, which is implemented by adopting the device in the embodiment 1 and comprises the following steps:
adding a mixed material of cyanide tailings and calcium chloride into a feeding area of a rotary hearth furnace body through a material distribution device 1-2, wherein the addition amount of the calcium chloride accounts for 6 wt% of the cyanide tailings, the mixed material moves along with a rotary hearth 2-2, the rotation speed of the rotary hearth 2-2 is 2.75 degrees/min, the thickness of a material layer is 160mm after the material enters a reaction area, the material layer is rapidly heated under the action of electric heating and microwave heating to react, the temperature of the reaction is 1050 ℃, gaseous chloride leaves from an exhaust port 6 in the reaction process to carry out metal recovery, the reacted solid material enters a material discharge area, and the sintered material is discharged after being depolymerized and scattered.
In the embodiment, the microwave rotary hearth furnace is adopted for chlorination gold extraction, the heating rate is high, the thermal efficiency can reach 97%, the smoke dust rate can be reduced to 4%, and the subsequent recovery of valuable metals is facilitated.
Example 4:
the embodiment provides a gold chloride extraction method of a microwave rotary hearth furnace, which is implemented by adopting the device in the embodiment 1 and comprises the following steps:
adding a mixed material of gold concentrate calcine and calcium chloride into a feeding area of a rotary hearth furnace body through a distributing device 1-2, wherein the addition amount of the calcium chloride accounts for 10 wt% of the gold concentrate calcine, the mixed material moves along with a rotary hearth 2-2, the rotating speed of the rotary hearth 2-2 is 1.5 degrees/min, the thickness of a material layer is 160mm after the material enters a reaction area, the material layer is rapidly heated under the action of electric heating and microwave heating to react, the temperature of the reaction is 1200 ℃, gaseous chloride leaves from an exhaust port 6 in the reaction process to carry out metal recovery, the reacted solid material enters a discharging area, and the sintering material is discharged after depolymerization and scattering.
In the embodiment, the microwave rotary hearth furnace is adopted for chlorination gold extraction, the heating rate is high, the heat efficiency can reach 98%, the smoke dust rate can be reduced to 3.5%, and the subsequent recovery of valuable metals is facilitated.
Example 5:
the embodiment provides a gold chloride extraction method of a microwave rotary hearth furnace, which is implemented by adopting the device in the embodiment 2 and comprises the following steps:
adding a mixed material of cyanide tailings and sodium chloride into a feeding area of a rotary hearth furnace body through a material distribution device 1-2, wherein the addition amount of the sodium chloride accounts for 3 wt% of the cyanide tailings, the mixed material moves along with a rotary hearth 2-2, the rotation speed of the rotary hearth 2-2 is 4 DEG/s, the thickness of a material layer is 50mm after the material enters a reaction area, the material layer is rapidly heated under the action of electric heating and microwave heating to react, the temperature of the reaction is 950 ℃, gaseous chloride leaves from an exhaust port 6 in the reaction process to carry out metal recovery, the reacted solid material enters a material discharge area, and the sintered material is depolymerized and scattered and then discharged.
In the embodiment, the microwave rotary hearth furnace is adopted for chlorination gold extraction, the heating rate is high, the heat efficiency is high and can reach 97.5%, the smoke dust rate can be reduced to 4.5%, and the subsequent recovery of valuable metals is facilitated.
Comparative example 1:
this comparative example provides a rotary hearth furnace gold chloride extraction apparatus and method, which is similar to the structure of example 1 except that: the device does not comprise a microwave unit, the rotary hearth 2-2 does not comprise an electric heating plate 2-5, and the annular side wall of the rotary hearth furnace is provided with a fuel nozzle.
The process is referred to the process in example 3, with the only difference that: the temperature rise and reaction of the materials depend on the heat released by the combustion of the fuel.
In the comparative example, the rotary hearth furnace for supplying heat by burning fuel is adopted for gold chlorination extraction, the heating is uneven, the heat efficiency is lower, the fuel is not fully burnt, reducing substances are easily generated, the chlorination volatilization reaction of valuable metals is not facilitated, the metal recovery rate is influenced, and the smoke dust rate is high and reaches over 10 percent.
It can be seen from the above examples and comparative examples that the device of the utility model uses the rotary hearth furnace for extracting valuable metals, and adopts microwave heating and electric heating modes, the heating rate is fast and uniform, the thermal efficiency is high, and the smoke rate is low; compared with a rotary kiln, the device reduces the granulating and drying processes of materials, shortens the process flow, reduces the energy consumption, investment and production cost, and is beneficial to improving the economic benefit and the environmental benefit.
The applicant states that the present invention is described in the above embodiments, but the present invention is not limited to the above detailed device, i.e. the present invention must not be implemented by relying on the above detailed device. It should be clear to those skilled in the art that any improvement of the present invention, to the addition of the equivalent replacement and auxiliary devices of the present invention, the selection of the specific mode, etc., all fall within the scope of protection and disclosure of the present invention.
Claims (10)
1. A gold extraction device by chlorination in a microwave rotary hearth furnace is characterized by comprising a feeding unit, a rotary hearth furnace body, a microwave unit, a transmission unit and a discharging unit;
the rotary hearth furnace body comprises an upper fixed furnace body and a lower rotary hearth, the rotary hearth furnace body is sequentially divided into a feeding area, a reaction area and a discharging area along the rotation direction of the hearth, the upper surface of the rotary hearth is provided with an electric heating plate, and the top of the rotary hearth furnace body is provided with an exhaust port;
the feeding unit is connected to a feeding area of the rotary hearth furnace body, the microwave unit is arranged on the top of the rotary hearth furnace, the transmission unit is arranged on the lower portion of the rotary hearth furnace and connected with the bottom of the rotary hearth furnace, and the discharging unit is arranged in a discharging area of the rotary hearth furnace body.
2. The gold chloride extraction device of claim 1, wherein the rotary hearth furnace is annular, and the upper annular furnace body and the rotary hearth furnace bottom form a closed furnace space.
3. The gold chloride extraction device of claim 1, wherein the feeding zone, the reaction zone and the discharging zone are separated by a longitudinal partition plate, and the lower end of the longitudinal partition plate is spaced from the upper surface of the rotary hearth;
the distance between the lower end of the longitudinal partition plate and the upper surface of the rotary furnace bottom is 30-200 mm.
4. The microwave rotary hearth furnace gold chloride extraction device according to claim 3, wherein the central angle of the annular furnace body corresponding to the feeding zone is 10-30 degrees, the central angle of the annular furnace body corresponding to the reaction zone is 270-330 degrees, and the central angle of the annular furnace body corresponding to the discharging zone is 10-30 degrees.
5. The gold chloride extraction device of claim 1, wherein the rotary hearth comprises an electric heating plate, a heat-resistant insulating layer and a hearth structure layer in sequence from top to bottom.
6. The gold chloride extraction device of claim 1, wherein the exhaust port is disposed on the top of the reaction zone near one side of the feeding zone;
the device still includes the exhaust unit, the exhaust unit includes the draught fan, the entry of draught fan links to each other with the gas vent of rotary hearth furnace.
7. The microwave rotary hearth furnace gold chloride extraction device according to claim 1, wherein the feeding unit comprises a metering conveying device and a distributing device, and an outlet of the distributing device extends into a feeding area of the rotary hearth furnace body.
8. The gold chloride extraction device of claim 1, wherein the microwave unit comprises at least one microwave generator uniformly distributed on the top of the rotary hearth furnace body corresponding to the reaction zone.
9. The gold chloride extraction device of claim 1, wherein the discharge unit comprises a loosening screw and a scraping screw in sequence along the rotation direction of the furnace bottom, and the loosening screw and the scraping screw are both arranged along the radial direction of the annular furnace body;
the tail end of the discharging unit is provided with a discharging opening, and the discharging opening is connected with a discharging chute.
10. The gold chloride extraction device of claim 1, wherein the transmission unit comprises supporting rollers, centering rollers and a driving device, the supporting rollers are uniformly distributed below the annular rotary furnace bottom and are in contact with the rotary furnace bottom, the centering rollers are uniformly distributed on the side wall of the inner ring of the rotary furnace bottom and outwards prop against the rotary furnace bottom on the circumference of the inner ring, and the driving device is arranged below the rotary furnace bottom and is connected with the rotary furnace bottom.
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