A chloroauric acid synthesis system for preparing micro-nano gold powder

Abstract

The utility model provides a kind of chloroauric acid synthesis system for micro-nano gold powder preparation, it is related to chloroauric acid synthesis technical field.The system is based on the integrated design of aqua regia dosing machine, crucible smelting furnace, nitrogen generator, chloroauric acid synthesis kettle, heater, condenser, refrigerator, absorption tower, induced draft fan and chloroauric acid storage tank and other system structures, first, the micron grade gold particles are formed by atomizing method to melt gold ingot again atomization, since micron gold particles are non-spherical at this time, further gold is dissolved to form chloroauric acid solution under a certain temperature by aqua regia stirring, for preparing micron grade spherical gold powder, the whole atomization gold dissolving process is carried out safely, efficiently and environmentally in chloroauric acid synthesis kettle, and gold loss is small.The system effectively solves the technical problem that it is difficult to dissolve gold in the preparation process of chloroauric acid solution for micro-nano spherical gold powder preparation.

Description

Technical Field

[0001] This utility model relates to the field of chloroauric acid synthesis technology, specifically to a chloroauric acid synthesis system for preparing micro / nano gold powder. Background Technology

[0002] Currently, the most common and mature method for preparing micro / nano gold powder using chemical methods is to reduce the gold precursor chloroauric acid (HAuCl4) to zero-valent gold atoms (Au) under the action of a reducing agent. 0 Gold atoms aggregate, nucleate, and grow, ultimately forming nanoscale particles. By precisely controlling the reaction conditions, spherical nanoparticles of different sizes, morphologies, and stability can be prepared. After purification, washing, and drying, the final micro-nano spherical gold powder is obtained. The precursor chloroauric acid serves as the core synthetic agent. The preparation process typically utilizes the strong oxidizing properties of aqua regia (a mixture of concentrated hydrochloric acid and concentrated nitric acid in a 3:1 volume ratio) to oxidize elemental gold (Au) into trivalent gold ions (Au³⁺). + ), then reacts with chloride ions (Cl) - They combine to form a stable [AuCl4] - The complex ions crystallize to obtain chloroauric acid hydrate. However, in the actual preparation of chloroauric acid, gold ingots need to be first prepared into gold foil, and then further prepared into gold wires and gold threads, which are then added to aqua regia. The dissolution process needs to be maintained at 60-80°C, accompanied by the generation of a large amount of fumes, and the dissolution process is relatively slow.

[0003] The atomization method for preparing gold powder utilizes a high-speed airflow or water flow to break up and atomize molten metal into numerous tiny droplets. These droplets spherize under surface tension and rapidly cool and solidify into near-spherical or non-spherical powders during flight. By adjusting parameters such as pressure, nozzle structure, and molten metal flow velocity, powders with particle size distributions ranging from tens to hundreds of micrometers can be produced.

[0004] To accelerate the gold dissolution efficiency of aqua regia while improving its safety, environmental friendliness, and reliability, it is necessary to develop a synthetic system for the rapid dissolution of gold ingots into micron-sized gold to prepare chloroauric acid. Utility Model Content

[0005] In view of the technical problems existing in the background art, the present invention provides a chloroauric acid synthesis system for preparing micro and nano gold powder, which adopts the atomization method to first atomize gold ingots into micron-sized gold powder and then add them into aqua regia to prepare chloroauric acid.

[0006] This utility model provides a chloroauric acid synthesis system for preparing micro-nano gold powder, which includes a crucible melting furnace, a chloroauric acid synthesis kettle, a temperature control mechanism, and a tail gas absorption mechanism. The crucible melting furnace is connected to the chloroauric acid synthesis vessel and is used to heat and melt gold ingots into liquid gold. The chloroauric acid synthesis reactor includes a reactor body, a metal atomizer and a stirring mechanism respectively connected to the reactor body, and is used to carry out the chloroauric acid synthesis reaction; The temperature regulation mechanism is connected to the chloroauric acid synthesis reactor and the tail gas absorption mechanism respectively, and is used to regulate the synthesis reaction temperature and the tail gas absorption temperature. The exhaust gas absorption mechanism is used to absorb and discharge the high-temperature flue gas generated by the synthesis reaction.

[0007] As a further improvement of this utility model, the metal atomizer is integrally disposed on the top of the vessel body, including an atomizing nozzle extending into the vessel body, a liquefied metal dosing port and a gas inlet respectively installed on the outside of the vessel body and arranged in parallel.

[0008] As a further improvement of this utility model, the stirring mechanism includes a support, a drive motor, and a stirrer; The support penetrates the vessel body and is installed at an angle on the vessel body; the drive motor is installed on the support; the stirrer is connected to the drive motor and extends at an angle into the interior of the vessel body.

[0009] As a further improvement of this utility model, the chloroauric acid synthesis reactor also includes a reactor body jacket disposed on the outer surface of the reactor body and connected to the temperature regulation mechanism.

[0010] As a further improvement of this utility model, a heating inlet and a heating outlet are provided on the surface of the vessel jacket; The temperature regulating mechanism includes heaters connected to the heating inlet and the heating outlet, respectively.

[0011] As a further improvement of this utility model, the temperature regulating mechanism includes a condenser and a refrigeration unit connected to each other; The air inlet and outlet of the condenser are connected to the air vent of the chloroauric acid synthesis reactor and the tail gas absorption mechanism, respectively.

[0012] As a further improvement of this utility model, the exhaust gas absorption mechanism includes an absorption tower and an induced draft fan connected to each other; the absorption tower and the condenser are connected.

[0013] As a further improvement of this utility model, the chloroauric acid synthesis system for preparing micro / nano gold powder also includes a chloroauric acid storage tank connected to the bottom of the chloroauric acid synthesis reactor.

[0014] As a further improvement of this utility model, the chloroauric acid synthesis system for preparing micro / nano gold powder also includes a nitrogen generator connected to the gas inlet of the metal atomizer.

[0015] As a further improvement of this utility model, the chloroauric acid synthesis system for preparing micro-nano gold powder also includes an aqua regia dosing machine connected to the reactor body.

[0016] The beneficial effects of this utility model are: The chloroauric acid synthesis system for preparing micro / nano gold powder provided by this utility model is based on the integrated design of aqua regia dosing machine, crucible melting furnace, nitrogen generator, chloroauric acid synthesis kettle, heater, condenser, refrigerator, absorption tower, induced draft fan, and chloroauric acid storage tank. First, gold ingots are melted and then atomized into micron-sized gold particles by atomization. Since the micron-sized gold particles are non-spherical at this time, they are further rapidly dissolved in aqua regia at a certain temperature to form a chloroauric acid solution, which is used to prepare micron-sized spherical gold powder. The entire atomization and dissolution process is carried out in the chloroauric acid synthesis kettle, which is safe, efficient, and environmentally friendly, with minimal gold loss. It effectively solves the technical problem of the difficulty in dissolving gold in the preparation process of chloroauric acid solution for micro / nano spherical gold powder.

[0017] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in this utility model will be briefly described below. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 A schematic diagram of the chloroauric acid synthesis system for preparing micro / nano gold powder provided by this utility model; Figure 2 This is a schematic diagram of the chloroauric acid synthesis reactor of the chloroauric acid synthesis system for preparing micro / nano gold powder provided by this utility model.

[0020] Explanation of reference numerals in the attached figures: 1. Aqua regia dosing machine; 2. Crucible melting furnace; 3. Nitrogen generator; 4. Chloroauric acid synthesis reactor; 5. Heater; 6. Condenser; 7. Refrigeration unit; 8. Absorption tower; 9. Exhaust fan; 10. Chloroauric acid storage tank; 41. Vessel body; 42. Vessel body jacket; 43. Metal atomizer; 44. Stirring mechanism; 411. Aqua regia dosing port; 412. Air vent; 413. Chloroauric acid drain valve; 421. Heating inlet; 422. Heating outlet; 423. Ear-type support; 431. Liquefied metal dosing port; 432. Gas inlet; 433. Atomizing nozzle; 441. Support; 442. Drive motor; 443. Agitator. Detailed Implementation

[0021] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the invention, are intended to cover non-exclusive inclusion.

[0023] In the description of the embodiments of this utility model, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly defined.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] In the description of this utility model embodiment, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0026] In the description of the embodiments of this utility model, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0027] In the description of the embodiments of this utility model, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0028] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0029] To address the technical problems of low gold dissolution efficiency, large gold loss, and poor safety and environmental protection in the traditional chloroauric acid preparation process, this invention provides a chloroauric acid synthesis system for preparing micro-nano gold powder. The system uses an atomization method to first atomize gold ingots into micron-sized gold powder, which is then added to aqua regia for chloroauric acid preparation.

[0030] Example 1 Please see Figure 1 As shown, the chloroauric acid synthesis system for preparing micro-nano gold powder provided by this utility model mainly consists of an aqua regia dosing machine 1, a crucible melting furnace 2, a nitrogen generator 3, a chloroauric acid synthesis kettle 4, a heater 5, a condenser 6, a refrigerator 7, an absorption tower 8, an induced draft fan 9, and a chloroauric acid storage tank 10.

[0031] Please see Figure 2 As shown, the chloroauric acid synthesis reactor 4 is composed of a reactor body 41, a reactor body jacket 42, a metal atomizer 43, and a stirring mechanism 44.

[0032] The surface of the vessel body 41 is provided with an aqua regia dosing port 411, an air vent 412, and a chloroauric acid drain valve 413.

[0033] The surface of the vessel jacket 42 is provided with a heating inlet 421, a heating outlet 422, and an ear-type support 423.

[0034] Said metal atomizer 43 is composed of a liquefied metal feeding port 431, a gas inlet 432 and an atomizing nozzle 433. The metal atomizer 43 is integrally installed on the top of the kettle body 41, and the atomizing nozzle 433 extends into the kettle body 41.

[0035] Said stirring mechanism 44 is composed of a support seat 441, a drive motor 442 and a stirrer 443. The support seat 441 penetrates through the kettle body jacket 42 and is obliquely installed on the kettle body 41, the drive motor 442 is mounted on the support seat 441, and the stirrer 443 is connected with the output shaft of the drive motor 442 and extends obliquely into the interior of the kettle body 41.

[0036] The connection modes between the above structures are as follows: Said aqua regia feeder 1 is in communication with the aqua regia feeding port 411 of the chloroauric acid synthesis kettle 4 through a pipeline valve. The crucible smelting furnace 2 is in process communication with the liquefied metal feeding port 431 of the metal atomizer 43 of the chloroauric acid synthesis kettle 4. The nitrogen generator 3 is in communication with the gas inlet 432 of the metal atomizer 43 of the chloroauric acid synthesis kettle 4 through a pipeline valve. The liquid outlet and liquid inlet ends of the heater 5 are respectively in communication with the heating liquid inlet 421 and the heating liquid outlet 422 of the kettle body jacket 42 of the chloroauric acid synthesis kettle 4 through pipeline valves. The gas inlet and gas outlet ends of the condenser 6 are respectively communicated with the air inducing port 412 of the chloroauric acid synthesis kettle 4 and the absorption tower 8 through pipelines. The exhaust end of the absorption tower 8 is in communication with the induced draft fan 9. The condensing structure of the condenser 6 is in communication with the refrigerator 7 through a pipeline valve. The chloroauric acid discharge valve 413 of the chloroauric acid synthesis kettle 4 is in communication with the chloroauric acid storage tank 10 through a pipeline.

[0037] The working process of the chloroauric acid synthesis system for preparing micro-nano gold powder provided by the present utility model is as follows: First, the heater 5 is started to preheat the kettle body 41 of the chloroauric acid synthesis kettle 4 through the heating liquid inlet 421, the heating liquid outlet 422 and the kettle body jacket 42. At this time, the aqua regia feeder 1 is started to feed a specified amount of aqua regia into the chloroauric acid synthesis kettle 4 through the aqua regia feeding port 411, then the drive motor 442 of the stirring mechanism 44 of the chloroauric acid synthesis kettle 4 is started, driving the stirrer 443 to stir so that the aqua regia in the kettle body 41 is mixed and flows uniformly.

[0038] At the same time, the crucible smelting furnace 2 is started to heat and melt gold ingots and gold blocks into gold liquid, the induced draft fan 9 is started, and the refrigerator 7 matched with the condenser 6 is started to perform refrigeration and heat exchange for the condenser 6.

[0039] The nitrogen generator 3 is started to control the gas flow rate and pressure to supply gas to the gas inlet 432 of the metal atomizer 43 of the chloroauric acid synthesis kettle 4 through the pipeline.

[0040] When the aqua regia solution in the chloroauric acid synthesis reactor 41 reaches the specified temperature under the stirring action of the stirrer 443, the molten gold in the crucible melting furnace 2 is poured into the liquefied metal inlet 431 of the metal atomizer 43. The liquefied gold liquid is atomized and sprayed out through the atomizing nozzle 433 at a certain flow rate under the action of nitrogen gas. The atomized gold liquid becomes gold particles ranging from tens to hundreds of micrometers and falls into the aqua regia in the chloroauric acid synthesis reactor 41. These micrometer-sized gold particles dissolve and mix rapidly in the aqua regia with vigorous stirring, forming a chloroauric acid solution.

[0041] When micron-sized gold particles are dissolved in aqua regia, a large amount of high-temperature flue gas is generated. This high-temperature flue gas may carry away some gold particles. Therefore, when a large amount of flue gas is generated and enters the condenser 6 through the air inlet 412, the gold particles will be returned to the chloroauric acid synthesis reactor 4 with the condensate under the action of condensation and reflux.

[0042] The cooled flue gas enters the absorption tower 8 for harmless absorption and discharge under the action of the induced draft fan 9. At this time, the temperature of the heater 5 continues to rise to maintain the temperature inside the reactor 41 at a specified value until no more flue gas is generated in the chloroauric acid synthesis reactor 4, and then the heater 5 is turned off.

[0043] Once the temperature inside the chloroauric acid synthesis reactor 4 has dropped to room temperature, turn off the drive motor 442 of the induced draft fan 9, the refrigeration unit 7, the nitrogen generator 3, and the stirring mechanism 44. Open the chloroauric acid drain valve 413 to drain the chloroauric acid solution in the reactor body 41 of the chloroauric acid synthesis reactor 4 to the chloroauric acid storage tank 10 for later use. The above system will then be used for the next chloroauric acid preparation.

[0044] In summary, this invention provides a chloroauric acid synthesis system for preparing micro / nano gold powder, relating to the field of chloroauric acid synthesis technology. This system is based on an integrated design of aqua regia dosing machine, crucible melting furnace, nitrogen generator, chloroauric acid synthesis reactor, heater, condenser, refrigerator, absorption tower, induced draft fan, and chloroauric acid storage tank. First, gold ingots are melted and then atomized into micron-sized gold particles using an atomization method. Since these micron-sized gold particles are non-spherical, they are further rapidly dissolved in aqua regia at a certain temperature to form a chloroauric acid solution for preparing micron-sized spherical gold powder. The entire atomization and dissolution process is carried out within the chloroauric acid synthesis reactor, ensuring safety, efficiency, and environmental friendliness with minimal gold loss. Therefore, it effectively solves the technical problem of difficulty in dissolving gold in the chloroauric acid solution preparation process for micro / nano spherical gold powder.

[0045] It should be noted that this utility model is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and function as the technical concept within the scope of this utility model are included within the technical scope of this utility model. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, are also included within the scope of this utility model without departing from the spirit of this utility model.

Claims

1. A chloroauric acid synthesis system for preparing micro / nano gold powder, characterized in that, This includes a crucible melting furnace, a chloroauric acid synthesis reactor, a temperature control mechanism, and a tail gas absorption mechanism; The crucible melting furnace is connected to the chloroauric acid synthesis vessel and is used to heat and melt gold ingots into liquid gold. The chloroauric acid synthesis reactor includes a reactor body, a metal atomizer and a stirring mechanism respectively connected to the reactor body, and is used to carry out the chloroauric acid synthesis reaction; The temperature regulation mechanism is connected to the chloroauric acid synthesis reactor and the tail gas absorption mechanism respectively, and is used to regulate the synthesis reaction temperature and the tail gas absorption temperature. The exhaust gas absorption mechanism is used to absorb and discharge the high-temperature flue gas generated by the synthesis reaction.

2. The chloroauric acid synthesis system for preparing micro / nano gold powder according to claim 1, characterized in that, The metal atomizer is installed on the top of the vessel body and includes an atomizing nozzle extending into the vessel body, a liquefied metal dosing port installed on the outside of the vessel body and connected in parallel, and a gas inlet.

3. The chloroauric acid synthesis system for preparing micro / nano gold powder according to claim 1, characterized in that, The stirring mechanism includes a support, a drive motor, and a stirrer; The support penetrates the vessel body and is installed at an angle on the vessel body; the drive motor is installed on the support; the stirrer is connected to the drive motor and extends at an angle into the interior of the vessel body.

4. The chloroauric acid synthesis system for preparing micro / nano gold powder according to claim 1, characterized in that, The chloroauric acid synthesis reactor also includes a reactor jacket disposed on the outer surface of the reactor body and connected to the temperature regulation mechanism.

5. The chloroauric acid synthesis system for preparing micro / nano gold powder according to claim 4, characterized in that, The surface of the vessel jacket is provided with a heating inlet and a heating outlet; The temperature regulating mechanism includes heaters connected to the heating inlet and the heating outlet, respectively.

6. The chloroauric acid synthesis system for preparing micro / nano gold powder according to claim 1, characterized in that, The temperature regulating mechanism includes a condenser and a refrigeration unit that are connected to each other; The air inlet and outlet of the condenser are connected to the air vent of the chloroauric acid synthesis reactor and the tail gas absorption mechanism, respectively.

7. The chloroauric acid synthesis system for preparing micro / nano gold powder according to claim 6, characterized in that, The exhaust gas absorption mechanism includes an absorption tower and an induced draft fan connected to each other; the absorption tower and the condenser are connected.

8. The chloroauric acid synthesis system for preparing micro / nano gold powder according to claim 1, characterized in that, The chloroauric acid synthesis system for preparing micro / nano gold powder also includes a chloroauric acid storage tank connected to the bottom of the chloroauric acid synthesis reactor.

9. The chloroauric acid synthesis system for preparing micro / nano gold powder according to claim 2, characterized in that, The chloroauric acid synthesis system for preparing micro / nano gold powder also includes a nitrogen generator connected to the gas inlet of the metal atomizer.

10. The chloroauric acid synthesis system for preparing micro / nano gold powder according to claim 1, characterized in that, The chloroauric acid synthesis system for preparing micro / nano gold powder also includes an aqua regia dosing machine connected to the reactor body.

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